Voltage measuring device and flow battery

Abstract

The invention discloses a voltage measuring device and a flow battery, the voltage measuring device is used for a galvanic pile of the flow battery, the galvanic pile comprises two end plates and a plurality of single batteries which are arranged between the two end plates and stacked in series, each single battery comprises a polar plate, and the polar plate is provided with a contact point; the voltage measuring device comprises a supporting plate, a plurality of probes arranged on the supporting plate, a multiplexer, a voltage acquisition card and a battery management system. Wherein the probes are elastically connected with the support plate, the support plate and the plurality of probes form a comb-tooth-shaped structure, and when the support plate is connected to the two end plates, each probe is in contact with the polar plate, so that the voltage measurement of each single battery is realized. According to the voltage measuring device provided by the invention, the voltage of the single battery can be measured through the plurality of probes, so that the synchronous and accurate measurement of the voltage of the single battery in the electric pile is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid flow battery voltage measurement, and in particular to a voltage measuring device and a liquid flow battery. Background Art

[0002] Flow batteries, a new type of energy storage battery, have attracted widespread attention due to their high capacity, long cycle life, and wide range of applications. In large-scale energy storage systems, flow battery stacks typically consist of dozens or even hundreds of individual cells connected in series. Common types include all-vanadium flow batteries, zinc-bromine flow batteries, iron-chromium flow batteries, and organic flow batteries. Currently, the voltage of flow battery stacks is generally measured by measuring the total voltage between the current collectors at both ends. However, due to the unavoidable contact resistance between the current collectors and the plates, the measured value is biased and the measurement accuracy is insufficient. Furthermore, this measurement method only measures the total voltage of the stack and cannot directly obtain the actual voltage data of the individual cells. Instead, it can only estimate the average value by dividing the total voltage by the number of cells, which masks the voltage differences between the individual cells. Therefore, it is impossible to monitor the actual voltage of each cell in real time. In the event of an abnormality in the stack, it is difficult to accurately locate the faulty cell, which indirectly leads to reduced battery performance and lifespan, thereby affecting the stability and safety of the system. Summary of the Invention

[0003] The present invention provides a voltage measuring device, which aims to solve the problem that the existing liquid flow battery voltage measurement technology has insufficient measurement accuracy and is difficult to achieve real-time monitoring of single cell voltage.

[0004] The present invention provides a voltage measuring device for a flow battery stack, wherein the stack includes two end plates and a plurality of single cells stacked in series and arranged between the two end plates, each of the single cells includes a plate, and the plate is provided with a contact point. The voltage measuring device includes: a support plate, the support plate being used to connect with the end plate; A plurality of probes are provided on the support plate, wherein the probes are elastically connected to the support plate, and the support plate and the plurality of probes form a comb-tooth structure; a multiplexer electrically connected to each of the probes and configured to read the voltage analog signal of the single battery; A voltage acquisition card, connected to the multiplexer, for converting the analog voltage signal into a digital voltage signal; A battery management system is connected to a voltage acquisition card and is used to acquire the digital voltage signal and process the digital voltage signal to obtain the voltage of each of the single cells. In one embodiment, the support plate is provided with a plurality of mounting holes, and the probe is mounted in the mounting holes via an elastic component, so that the probe is elastically connected to the support plate.

[0005] In one embodiment, the elastic component includes a spring or a rubber component.

[0006] In one embodiment, the probe includes a probe body and a detection contact, wherein the elastic component is connected to one end of the probe body, and the detection contact is provided at the other end of the probe body.

[0007] In one embodiment, the detection contacts are plated with a conductive film, the material of the detection contacts includes beryllium copper alloy, stainless steel or titanium alloy, and the material of the conductive film includes gold, platinum or palladium.

[0008] In one embodiment, the electrode plate includes a monopolar plate or a bipolar plate, and the contact point is provided on the top of the monopolar plate or the bipolar plate, wherein the electrode plate close to the end plate is the monopolar plate, and the remaining electrode plates are the bipolar plates.

[0009] In one embodiment, the battery stack further includes two insulating plates and two current collecting plates, each of the current collecting plates is connected to one of the end plates via one of the insulating plates, and the plurality of single cells are disposed between the two current collecting plates.

[0010] In one embodiment, a connecting piece adapted to the end plate is provided on the support plate, and the support plate is fixedly connected to the end plate via the connecting piece.

[0011] In one embodiment, the support plate and the end plate are fixedly connected by magnetism or screws.

[0012] The present application also provides a liquid flow battery, which is an all-vanadium liquid flow battery, a zinc-bromine liquid flow battery, an iron-chromium liquid flow battery or an organic liquid flow battery, and the liquid flow battery includes any voltage measuring device provided in the embodiments of the present application.

[0013] The voltage measuring device provided by the present invention is suitable for a flow battery stack, wherein the flow battery is at least one of an all-vanadium flow battery, a zinc-bromine flow battery, an iron-chromium flow battery, or an organic flow battery. The stack includes two end plates and a plurality of single cells stacked in series between the two end plates, each single cell including a plate having a contact point. The voltage measuring device includes a support plate, a plurality of probes disposed on the support plate, a multiplexer, a voltage acquisition card, and a battery management system. The plurality of probes disposed on the support plate form a comb-like structure to facilitate contact between the probes and the plates of the single cells. The multiplexer is electrically connected to each probe to read the voltage analog signal of each single cell. The voltage acquisition card converts the voltage analog signal into a digital voltage signal. The battery management system is used to acquire and process the digital voltage signal to obtain the voltage of each single cell. The multiple probes on the voltage measuring device provided by the present invention can contact the contact points of the plates of multiple single cells at the same time, optimizing the structure of the voltage measurement component of the liquid flow battery, realizing accurate and synchronous measurement of the voltage of each single cell in the liquid flow battery stack, and significantly improving the measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of a scenario in which the measuring component of the voltage measuring device provided by the present invention measures the voltage of a battery stack; Figure 2 1 is a schematic structural diagram of a probe provided by the present invention; Figure 3 It is a schematic diagram of the working principle of the voltage measuring device provided by the present invention.

[0016] Description of reference numerals: 100. Voltage measuring device; 10. Battery stack; 11. End plate; 12. Insulation plate; 13. Current collector; 14. Single cell; 141. Plate; 142. Electrode; 143. Diaphragm; 1411. Contact point; 20. Measuring assembly; 21. Support plate; 22. Probe; 211. Mounting hole; 212. Connector; 221. Probe contact; 222. Probe body; 223. Elastic component; 30. Multiplexer; 40. Voltage acquisition card; 50. Battery management system. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0019] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0020] It should be further understood that the term "and / or" used in the present description and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0021] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0022] In liquid flow battery systems, accurate single-cell voltage monitoring helps prevent single cells from being overcharged or undercharged, and can promptly detect changes or abnormalities in the battery system. It is a core element in ensuring the performance and efficiency of the battery system. In existing liquid flow battery voltage measurement technologies, external voltage probes or a limited number of voltage measurement points are mainly used. This measurement method not only significantly increases the complexity of the system, but also easily causes measurement errors, making it difficult to achieve accurate measurement of the in-situ voltage of a single cell in the battery stack. In addition, liquid flow batteries are often in high temperature, high humidity and highly corrosive electrolyte environments, which may even cause battery performance degradation and life reduction. The above-mentioned defects in existing measurement technologies not only limit the optimization space for battery performance, but also increase the maintenance cost and failure risk of the system.

[0023] To solve the above problem, please refer to Figure 1 , Figure 1 It is a schematic diagram of a scenario in which the measuring component of the voltage measuring device 100 provided by the present invention measures the voltage of a fuel cell stack.

[0024] like Figure 1 As shown, the voltage measuring device 100 provided by the present invention includes a measuring component 20 for connecting to the fuel cell stack 10 .

[0025] The battery stack 10 includes two end plates 11 and a plurality of single cells 14. The multiple single cells 14 are arranged between the two end plates 11 and are stacked in series. Each single cell 14 includes a plate 141, which is provided with contact points 1411. The measurement assembly 20 includes a support plate 21 and a plurality of probes 22 disposed on the support plate 21. The probes 22 are elastically connected to the support plate 21, and the support plate 21 and the plurality of probes 22 form a comb-like shape. When the support plate 21 is connected to the two end plates 11, each probe 22 contacts the plate 141, allowing the probes 22 to measure the voltage of the single cell 14.

[0026] The single cell 14 further includes an electrode 142 and a separator 143 . The electrode plate 141 , the electrode 142 and the separator 143 constitute a single cell 14 .

[0027] The voltage measuring device 100 provided in an embodiment of the present invention optimizes the structure of the measuring component 20 and installs a plurality of parallelly arranged probes 22 on the support plate 21. The support plate 21 and the probes 22 form a comb-tooth structure, so that each probe 22 can correspondingly contact the electrode 141 on each single cell 14, thereby realizing the synchronous and precise measurement of the voltages of the plurality of single cells 14 in the battery stack 10 and improving the measurement accuracy.

[0028] In some embodiments, the support plate 21 is provided with a plurality of mounting holes 211 , and the probes 22 are mounted in the mounting holes 211 via elastic components 223 , so that the probes 22 are elastically connected to the support plate 21 .

[0029] The mounting hole 211 and the elastic component 223 enable the probe 22 to be fixedly mounted on the support plate 21 , so that the measuring assembly 20 can operate stably and reduce measurement errors.

[0030] In some embodiments, the elastic member 223 may include a spring or a rubber member.

[0031] Among them, when the elastic component 223 is a spring, due to the elastic deformation of the spring, it has the advantages of high-precision pressure control, good durability, stable elastic performance, etc., which can ensure that the probe 22 is in full contact with the electrode 141 and has an elastic buffering protection effect; when the elastic component 223 is a rubber component, it mainly plays the role of multi-dimensional buffering and corrosion resistance.

[0032] In some embodiments, the probe 22 includes a probe body 222 and a detection contact 221 . One end of the probe body 222 is connected to the elastic component 223 , and the detection contact 221 is provided at the other end of the probe body 222 .

[0033] For probe 22, please also see Figure 2 , Figure 2 2 is a schematic structural diagram of a probe 22 provided in an embodiment of the present invention.

[0034] like Figure 2 As shown, the probe 22 provided by the embodiment of the present invention includes a detection contact 221 , a probe body 222 and an elastic component 223 . The detection contact 221 is connected to one end of the probe body 222 , and the elastic component 223 is provided at the other end of the probe body 222 .

[0035] Among them, the elastic component 223 can be a spring or a rubber component. The elastic component 223, through its elastic deformation characteristics, when the support plate 21 is connected to the end plate 11 through the connector 212, forms a constant pressure contact between the detection contact 221 and the contact point 1411 of the electrode 141, thereby realizing adaptive adjustment of each probe 22 when contacting each single cell 14.

[0036] In some embodiments, the detection contact 221 is plated with a conductive film.

[0037] For example, the material of the detection contact 221 can be beryllium copper alloy, stainless steel or titanium alloy, and the material of the conductive film can be gold, platinum or palladium.

[0038] In some embodiments, each single cell 14 includes a plate 141, wherein the plate 141 includes a unipolar plate and a bipolar plate. The plate 141 close to the end plate 11 is a unipolar plate, and the remaining plates 141 are bipolar plates. A contact point 1411 is provided on the top of each plate 141 to ensure one-to-one contact with the detection contact 221 of the probe 22.

[0039] In some embodiments, the fuel cell stack 10 further includes two insulating plates 12 and two current collecting plates 13 .

[0040] In some embodiments, each current collecting plate 13 is connected to one of the end plates 11 via an insulating plate 12 , and a plurality of single cells 14 are disposed between two current collecting plates 13 .

[0041] In some embodiments, a plurality of probes 22 arranged in parallel are provided on the support plate 21 , and the measuring assembly 20 is connected to the fuel cell stack 10 by magnetic attraction or screw fixing.

[0042] Specifically, the support plate 21 may be provided with a connector 212 adapted to the end plate 11 , so that the end plate 11 and the support plate 21 are fixedly connected.

[0043] Specifically, the connecting member 212 is located at the bottom of the two support plates 21 and is used to connect the support plates 21 and the end plates 11 .

[0044] For example, the connecting member 212 may be a screw or a magnetic adsorption component.

[0045] For example, the connecting member 212 can be a screw, and the support plate 21 and the end plate 11 are connected by screw fixing. The structure obtained by this connection method is more solid and can withstand greater pressure or impact force, making the operation of the voltage measuring device 100 more stable.

[0046] For example, the connector 212 may be a magnetic adsorption component, and the support plate 21 and the end plate 11 are connected by magnetic fixation, which has the advantage that the components can be quickly installed and disassembled without the aid of tools.

[0047] See also Figure 3 , Figure 3 FIG. 1 is a schematic diagram showing the working principle of the voltage measuring device 100 provided in an embodiment of the present invention. Figure 3 In the structure shown, the voltage measurement device 100 further includes a multiplexer 30 , a voltage acquisition card 40 , and a battery management system (BMS) 50 . The multiplexer 30 is electrically connected to each of the probes 22 , the voltage acquisition card 40 is connected to the multiplexer 30 , and the battery management system 50 is connected to the voltage acquisition card 40 .

[0048] like Figure 3 As shown, the working principle of the voltage measurement device 100 provided by the embodiment of the present invention is as follows: the support plate 21 is connected to the end plate 11 through the connector 212, wherein each probe 22 of the measuring component 20 is electrically connected to the multiplexer 30, and the multiplexer 30 reads the voltage analog signal of each single battery 14; the voltage acquisition card 40 is connected to the multiplexer 30 to convert the voltage analog signal into a digital voltage signal; the battery management system 50 is connected to the voltage acquisition card 40 to obtain the digital voltage signal and process the digital voltage signal. Figure 3As shown in the working principle, the voltage measuring device 100 provided by the present invention installs multiple probes 22 on the support plate 21, and the support plate 21 is connected to the end plate 11 of the battery stack 10. The fixed connection between the support plate 21 and the end plate 11 forms a closed voltage signal transmission path, so that the wire length from the probe 22 to the multiplexer 30 is unified to a fixed value, avoiding the voltage acquisition error caused by the difference in wire length, so that each probe 22 is in one-to-one contact with each electrode plate 141, so that the voltage of each electrode plate 141 can be measured by the probe 22, thereby realizing the synchronous and accurate measurement of the voltage of each single cell 14 in the voltage measuring device 100, improving the measurement accuracy and efficiency; in addition, the digital voltage signal provided by the voltage acquisition card 40 can be monitored and analyzed in real time by the battery management system 50, thereby providing timely and accurate data support for the diagnosis and analysis of liquid flow battery performance and abnormal conditions.

[0049] An embodiment of the present application further provides a liquid flow battery, which includes any voltage measuring device 100 provided in the above embodiments.

[0050] Among them, the flow battery may include an all-vanadium flow battery, a zinc-bromine flow battery, an iron-chromium flow battery or an organic flow battery.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A voltage measuring device, characterized in that: A stack for a liquid flow battery, the stack comprising two end plates and a plurality of single cells stacked in series arranged between the two end plates, each of the single cells comprising a plate, the plate being provided with a contact point, the voltage measuring device comprising: a support plate, the support plate being used to connect with the end plate; A plurality of probes are provided on the support plate, wherein the probes are elastically connected to the support plate, and the support plate and the plurality of probes form a comb-tooth structure; a multiplexer electrically connected to each of the probes and configured to read the voltage analog signal of the single battery; A voltage acquisition card, connected to the multiplexer, for converting the analog voltage signal into a digital voltage signal; A battery management system is connected to a voltage acquisition card and is used to acquire the digital voltage signal and process the digital voltage signal to obtain the voltage of each of the single cells.

2. The voltage measuring device according to claim 1, characterized in that The support plate is provided with a plurality of mounting holes, and the probe is mounted in the mounting holes through an elastic component so that the probe is elastically connected to the support plate.

3. The voltage measuring device according to claim 2, characterized in that: The elastic component includes a spring or a rubber component.

4. The voltage measuring device according to claim 2, characterized in that: The probe comprises a probe body and a detection contact, wherein the elastic component is connected to one end of the probe body, and the detection contact is provided at the other end of the probe body.

5. The voltage measuring device according to claim 4, characterized in that: The detection contacts are plated with a conductive film. The material of the detection contacts includes beryllium copper alloy, stainless steel or titanium alloy, and the material of the conductive film includes gold, platinum or palladium.

6. The voltage measuring device according to claim 1, characterized in that: The electrode plate includes a monopolar plate or a bipolar plate, and the contact point is provided on the top of the monopolar plate or the bipolar plate, wherein the electrode plate close to the end plate is the monopolar plate, and the remaining electrode plates are the bipolar plates.

7. The voltage measuring device according to claim 1, wherein: The battery stack further includes two insulating plates and two current collecting plates. Each of the current collecting plates is connected to one of the end plates via one of the insulating plates. The plurality of single cells are disposed between the two current collecting plates.

8. The voltage measuring device according to claim 1, wherein: The support plate is provided with a connecting piece adapted to the end plate, and the support plate is fixedly connected to the end plate via the connecting piece.

9. The voltage measuring device according to claim 8, characterized in that: The support plate and the end plate are fixedly connected by magnetism or screws.

10. A flow battery, characterized in that: The liquid flow battery comprises the voltage measuring device according to any one of claims 1 to 9, and the liquid flow battery is an all-vanadium liquid flow battery, a zinc-bromine liquid flow battery, an iron-chromium liquid flow battery, or an organic liquid flow battery.

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