CN215988869U - Series-type flow battery energy storage device, energy storage system and electric power system - Google Patents
Series-type flow battery energy storage device, energy storage system and electric power system Download PDFInfo
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Abstract
The utility model provides a series flow battery energy storage device, an energy storage system comprising the energy storage device and an electric power system comprising the energy storage system, wherein the energy storage device comprises: a plurality of positive and negative electrolyte storage tanks, wherein each pair of positive and negative electrolyte storage tanks supplies liquid to one or more cell stacks through a pipeline pipe fitting; the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks are sequentially connected in series through a lead to form a group of series cell stacks; the converter equipment comprises a DC/AC bidirectional converter, a double-split transformer and a switch cabinet; the low-voltage direct-current end of the DC/AC bidirectional converter is connected with a group of series battery stacks, and the high-voltage alternating-current end of the DC/AC bidirectional converter is connected into a double-splitting transformer; every two DC/AC bidirectional converters are connected with a double-split transformer; all double-split transformers are connected into one or more switch cabinets through cables, and each double-split transformer is connected into only one switch cabinet. The series flow battery energy storage device or system is low in cost and easy to maintain, and the electric energy conversion efficiency of the flow battery is obviously improved.
Description
Technical Field
The utility model belongs to the technical field of energy storage, and particularly relates to a series flow battery energy storage device, an energy storage system and an electric power system.
Background
Redox flow batteries are a new type of electrochemical energy storage system, and the flow batteries achieve charge and discharge by using a redox reaction between active ions contained in a positive electrode electrolyte and active ions contained in a negative electrode electrolyte. The flow battery technology has the advantages of long service life, environmental friendliness, high safety and reliability, strong adaptability, low cost and the like, the output power is thousands of watts to tens of megawatts, the energy storage capacity can reach more than hours, and the flow battery is an electrochemical energy storage mode widely applied in the field of energy storage and is also one of the technical routes of large-scale energy storage.
As a large-sized power storage facility, the energy storage scale of the flow battery is between that of a power grid and that of various portable batteries, and the flow battery can just fill the blank between the large-sized power grid and the small-sized batteries, so that the flow battery plays a unique role in many fields. Based on the current flow battery technology, the single-section direct current voltage of the battery stack is relatively low, the output voltage is required to be achieved through multi-stage boosting, meanwhile, multi-stage power equipment causes the efficiency of the system to be reduced, and the equipment cost is increased. The liquid flow battery oriented to large-scale long-time energy storage has very high requirements on the efficiency and safety of the system, and the series-type liquid flow battery energy storage technology can achieve the requirements on the efficiency and safety by reducing the number of boosting stages, reducing power equipment and independent direct current bus voltage, so that the economy of the system is improved.
Chinese patent No. 202021342107.1 discloses a flow battery system, wherein flow batteries corresponding to different battery tanks are connected in series, so as to significantly improve the voltage level of the flow battery system, and the capacity of the flow battery system can be greatly improved under the same current, and simultaneously, the problem of high loss of series efficiency of a battery stack in the prior art is reduced, and the charge-discharge conversion efficiency of the flow battery is improved, but the shift transformer related to the flow battery system belongs to a special transformer, so that the manufacturing difficulty is high, and the cost is high; the low-voltage windings of the phase-shifting transformer are more, the impedance is difficult to realize consistently, and the operation of the DC/AC converter is possibly influenced; the transformer is easy to generate excitation inrush current, influences high-frequency power electronic components in a DC/AC converter, and is particularly obvious in the application scene of a 35kV energy storage system; parasitic inductance is easily generated in the phase-shifting transformer, the quality of output electric energy is reduced due to electric energy conversion of the phase-shifting transformer, the stable operation of a power grid is possibly influenced, and the service life of an energy storage battery is influenced.
Chinese patent No. 201910894447.0 discloses a flow cell energy storage device comprising a plurality of cell stack groups, each cell stack group comprising a plurality of cell stacks; the liquid path pipelines are connected in series with a plurality of cell stacks in a cell stack group; the flow battery energy storage device only relates to a pair of positive and negative electrolyte storage tanks, and has higher requirements on the capacity of a single storage tank and the conveying capacity of a single pump under the conditions of constant battery stack power and constant energy storage system operation time; the different grades of battery stacks in the flow battery energy storage system are connected in series through the pipelines, electrolyte can generate pressure loss when flowing through each grade of battery stack, the flow speed of the electrolyte of the previous battery stack is lower than that of the electrolyte of the next battery stack, the concentration of the electrolyte ion entering the previous battery stack is higher than that of the next battery stack, the two problems can cause the performance difference of each grade of battery stack, and therefore larger bypass current is generated, and the electric energy conversion efficiency is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provides a series flow battery energy storage device, an energy storage system comprising the series flow battery energy storage device and an electric power system comprising the energy storage system.
In order to achieve the technical purpose, the technical scheme adopted by the utility model is as follows:
a series flow battery energy storage device, comprising:
a plurality of positive and negative electrolyte storage tanks, wherein each pair of positive and negative electrolyte storage tanks supplies liquid to one or more cell stacks through a pipeline pipe fitting;
the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks are sequentially connected in series through a lead to form a group of series cell stacks; the series battery stacks form a series loop;
the converter equipment comprises a DC/AC bidirectional converter, a double-split transformer and a switch cabinet; the low-voltage direct-current end of the DC/AC bidirectional converter is connected with a group of series battery stacks, and the high-voltage alternating-current end of the DC/AC bidirectional converter is connected into a double-splitting transformer; every two DC/AC bidirectional converters are connected with a double-split transformer; the double-split transformer is connected into one or more switch cabinets through cables, and each double-split transformer is connected into only one switch cabinet.
Furthermore, the high-voltage alternating current end of every two DC/AC bidirectional converters is connected to one low-voltage winding of the double-split transformer.
And the liquid path pump is used for conveying the electrolyte in the positive and negative electrolyte storage tanks into the battery stack and/or conveying the electrolyte in the battery stack back to the positive and negative electrolyte storage tanks.
Furthermore, each pair of positive and negative electrolyte storage tanks consists of a positive electrolyte storage tank and a negative electrolyte storage tank;
the positive electrolyte storage tank inputs positive electrolyte into the positive electrode of the cell stack through a positive electrode pump, and the positive electrolyte returns to the original positive electrolyte storage tank through a pipeline after flowing out of the positive electrode outlet of the cell stack;
the negative electrolyte storage tank inputs the negative electrolyte into the cathode of the cell stack through the negative pump, and the negative electrolyte returns to the original negative electrolyte storage tank through a pipeline after flowing out from the cathode outlet of the cell stack.
The electrolytic bath device further comprises flow control valves, wherein the flow control valves are installed on the liquid pipeline pipelines and used for adjusting the flow of the electrolyte in the liquid pipeline.
Furthermore, a pair of positive and negative electrolyte storage tanks supplies liquid to one cell stack through a pipeline, each cell stack is independent, and the flow velocity and the flow rate of the electrolyte flowing through each cell stack are the same; the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks are sequentially connected in series to form a group of series circuits, each cell stack is only connected in one series circuit, and the number of the cell stacks in each group of series circuits is the same; the fluid systems of the stacks in the same series circuit are isolated from each other.
Furthermore, a pair of positive and negative electrolyte storage tanks supplies liquid to a plurality of cell stacks through pipeline pipes, the cell stacks supplied with liquid from the same positive and negative electrolyte storage tank are connected in parallel through pipelines, and the flow velocity and the flow rate of the electrolyte flowing through each cell stack are the same; the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks are sequentially connected in series through a lead to form a group of series circuits, the number of the cell stacks in each group of series circuits is the same as the logarithm of the anode and cathode electrolyte storage tanks, and each cell stack is only connected in one series circuit; the fluid systems of the stacks in the same series circuit are isolated from each other.
Further, the DC/AC bidirectional converters corresponding to different series circuits have the same structure and model.
Furthermore, all double-split transformers are connected into a switch cabinet through cables.
The utility model also provides a series flow battery energy storage system which comprises the series flow battery energy storage device.
Further, the number of the series flow battery energy storage devices is one or more than one.
The utility model also provides a power system which comprises the series flow battery energy storage system.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the utility model provides a serial flow battery energy storage device, an energy storage system comprising one or more serial flow battery energy storage devices and an electric power system comprising the energy storage system, wherein the serial flow battery energy storage device comprises a plurality of pairs of positive and negative electrolyte storage tanks, each pair of positive and negative electrolyte storage tanks supplies liquid to one or more battery stacks through process systems such as pipeline pipes and the like, and the battery stacks supplying liquid to different positive and negative electrolyte storage tanks are sequentially connected in series through leads to form a group of serial loops, so that the voltage grade of the serial flow battery energy storage device or system is remarkably improved, the use of boosting equipment is reduced, the cost of an electric appliance is reduced, and the electric energy conversion efficiency is improved; meanwhile, the problem of high loss of the series efficiency of the cell stack in the existing system is solved, and the electric energy conversion efficiency of the flow battery is improved;
(2) for the tandem type flow battery energy storage device, when each pair of positive and negative electrolyte storage tanks simultaneously supplies liquid to a plurality of battery stacks, the positive and negative electrolyte storage tanks are connected with the plurality of battery stacks in parallel through the pipelines, so that the problems of uneven electrolyte flow velocity and ion concentration in the related technology are solved, the effect of keeping the performance of the battery stacks consistent is further achieved, the generation of bypass current is avoided, the electric energy conversion efficiency is improved, the control difficulty of a DC/AC converter on the inconsistency of batteries is reduced, and the service life of a tandem type flow battery energy storage system is prolonged;
(3) the transformer adopts the double-split transformer, can effectively inhibit current harmonics generated by more split winding transformers, and can reduce the number of system transformer devices and the production cost compared with a single transformer; compared with a special transformer, such as a shifting transformer, the transformer has the advantages that the number of windings is small, excitation inrush current is not easy to generate, and therefore the normal operation of DC/AC converter equipment is not influenced; the transformer is not easy to generate non-characteristic harmonic waves to the power grid side, and the power quality of the power grid is ensured; the transformer is also beneficial to the transportation, the carrying, the assembly and the maintenance of the device or the system component, and the cost can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of a series flow battery energy storage device in embodiment 1 of the utility model;
fig. 2 is a schematic structural diagram of a series flow battery energy storage device in embodiment 2 of the utility model.
Wherein the reference numerals are: positive and negative electrolyte storage tanks 1, a DC/AC bidirectional converter 2, a double-split transformer 3 and a switch cabinet 4.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The utility model provides a series flow battery energy storage device, which comprises a plurality of pairs of positive and negative electrolyte storage tanks 1 and a converter device; each pair of positive and negative electrolyte storage tanks 1 supplies liquid to one or more battery stacks through a process system such as a pipeline pipe fitting, two positive and negative electrolyte storage tanks are arranged in each pair, namely a positive electrolyte storage tank and a negative electrolyte storage tank, the positive electrolyte storage tank inputs positive electrolyte into the positive electrode of the battery stack through a positive pump, flows out of a positive outlet after flowing through the battery stack, and returns to the positive electrolyte storage tank through a pipeline; the negative electrolyte storage tank inputs the negative electrolyte into the negative electrode of the cell stack through a negative electrode pump, and then the negative electrolyte flows back to the original negative electrolyte storage tank through a pipeline to form a circulation loop; each liquid pipeline is provided with a flow control valve for adjusting the flow of the electrolyte in the liquid pipeline and ensuring that the flow velocity and the flow of the electrolyte flowing through the cell stack are the same; the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks 1 are sequentially connected in series through a lead to form a series cell stack forming a series loop; the converter equipment comprises a DC/AC bidirectional converter 2, a double-split transformer 3 and a switch cabinet 4; the low-voltage direct-current end of the DC/AC bidirectional converter 2 is connected with a group of series battery stacks, the high-voltage alternating-current end of the DC/AC bidirectional converter 2 is connected with one low-voltage winding of the double-split transformer 3, namely, the number of the groups of the series battery stacks is the same as that of the DC/AC bidirectional converter 2, every two DC/AC bidirectional converters 2 are connected with one double-split transformer 3, all the double-split transformers 3 are connected into one or more switch cabinets 4 through cables, and each double-split transformer 3 is only connected into one switch cabinet 4.
Preferably, all the double-split transformers 3 are connected into one switch cabinet 4 through cables, and compared with the connection into a plurality of switch cabinets 4, the mode can save the use of electrical equipment, save the occupied area and reduce the complexity of control
Example 1
As shown in fig. 1, the tandem type flow battery energy storage device of the present invention comprises a plurality of pairs of positive and negative electrolyte storage tanks 1 and converter equipment, wherein the converter equipment comprises a DC/AC bidirectional converter 2, a double-split transformer 3 and a switch cabinet 4, each pair of positive and negative electrolyte storage tanks 1 consists of a positive electrolyte storage tank and a negative electrolyte storage tank, each pair of positive and negative electrolyte storage tanks 1 simultaneously provides electrolyte for a plurality of battery stacks, the outlets of the positive and negative electrolyte storage tanks 1 are respectively connected with a pump by a pipeline, which are respectively a positive pump and a negative pump, the positive electrolyte storage tank inputs the positive electrolyte into the positive electrode of the battery stack through the positive pump, and the negative electrolyte storage tank inputs the negative electrolyte into the negative electrode of the battery stack through the negative pump; all the cell stacks supplied by the same anode and cathode electrolyte storage tank 1 are connected in parallel through pipelines, for example, the cell stacks are numbered from 1-1 to M-1, from 1-2 to M-2, from … and from 1-N to M-N, flow control valves are arranged on the liquid path pipelines and used for adjusting the flow of the electrolyte in the liquid path pipelines, so that the flow velocity and the flow of the electrolyte flowing through the cell stacks are the same, and the performance consistency of the cell stacks is ensured; the positive electrode and the negative electrode of the battery stacks supplied by different positive and negative electrode electrolyte storage tanks 1 are sequentially connected through a lead to form a group of series loops, each battery stack is only connected in one series loop, for example, the serial numbers of the battery stacks are 1-N, 2-1-2-N, … and M-1-M-N, the serial numbers of the battery stacks in each group are the same, and the serial numbers of the battery stacks are the same as the logarithm of the positive and negative electrode electrolyte storage tanks 1; under the circuit connection mode (parameters of each cell stack are the same), the output voltage of the series flow battery energy storage device is N times of the voltage of the single cell stack, and the output current is the same as the current of the single cell stack, so that the voltage grade is increased, the boosting equipment is reduced, the electrical cost is reduced, and the electric energy conversion efficiency is improved. Liquid path systems of the cell stacks in the same series loop supplied by different anode and cathode electrolyte storage tanks 1 are mutually isolated, and liquid path circulation is avoided if the liquid path systems numbered as 1-1 cell stack and the liquid path systems numbered as 1-2 cell stack are mutually independent; a group of electrically connected battery stacks (a group of battery stacks in series) is connected with the low-voltage direct-current end of a DC/AC bidirectional converter 2 through a cable, and the DC/AC bidirectional converter 2 corresponding to each group of battery stacks in series has the same structure and model; every two DC/AC bidirectional converters 2 are connected with a double-splitting transformer 3 through cables, the structure and the model of each double-splitting transformer 3 are the same, and the high-voltage alternating current ends of the two DC/AC bidirectional converters 2 corresponding to one double-splitting transformer 3 are respectively connected with one low-voltage winding of the transformer; all double split transformers 3 are wired into a switchgear cabinet 4.
The transformer adopts the double-split transformer, the technology is mature, current harmonics generated by more split winding transformers can be effectively inhibited, and compared with a single transformer, the double-split transformer can reduce the number of system transformer devices, thereby reducing the production cost; the double-split transformer is not easily influenced by frequent power flow conversion in a 35kV energy storage system, and normal and stable operation of high-frequency electronic equipment in the DC/AC converter is ensured; the transformer is not easy to generate non-characteristic harmonic waves on the power grid side, and good power quality is guaranteed.
Example 2
As shown in fig. 2, the tandem type flow battery energy storage device of the present invention comprises a plurality of pairs of positive and negative electrolyte storage tanks 1 and converter equipment, wherein the converter equipment comprises a DC/AC bidirectional converter 2, a double-split transformer 3 and a switch cabinet 4, each pair of positive and negative electrolyte storage tanks 1 consists of one positive electrolyte storage tank and one negative electrolyte storage tank, each pair of positive and negative electrolyte storage tanks 1 only provides electrolyte for a single battery stack, the requirements on the capacity of the single storage tank and the performance of the single pump are low, the type selection is easy, the charging and discharging uniformity of each battery stack can be ensured, and the complexity of the control strategy of the DC/AC converter is reduced; the number of the cell stacks of the whole flow battery energy storage device is the same as the number of pairs of the positive and negative electrolyte storage tanks 1, and the number of the cell stacks and the number of the groups are configured according to the required capacity; the outlet of the positive and negative electrolyte storage tank 1 is respectively connected with a positive pump and a negative pump through pipelines, the positive electrolyte storage tank inputs the positive electrolyte into the positive electrode of the battery stack through the positive pump, the negative electrolyte storage tank inputs the negative electrolyte into the negative electrode of the battery stack through the negative pump, and each liquid pipeline is provided with a flow control valve for regulating the electrolyte flow in the liquid pipeline, ensuring that the electrolyte flow rate and the electrolyte flow passing through the battery stack are the same, and ensuring that the electrolyte flow rate and the electrolyte flow passing through the battery stack are the same; the liquid path systems of each cell stack are mutually independent, such as the cell stacks numbered 1-1, the cell stacks numbered 1-2 and the cell stacks numbered 2-1 in the figure 2; the positive electrodes and the negative electrodes of the cell stacks are sequentially connected through the conducting wires to form a group of series loops, each cell is only connected in one series loop, for example, the serial numbers of the cell stacks are 1-1 to 1-N, 2-1 to 2-N, … and M-1 to M-N are the same, and the number of the cell stacks in each group of series cell stacks is the same. Liquid path systems of the cell stacks in the same serial loop are mutually isolated, and liquid path circulation is avoided if the cell stack numbered M-1 and the liquid path system numbered M-N are mutually independent; a group of electrically connected battery stacks (a group of battery stacks in series) is connected with the low-voltage direct-current end of a DC/AC bidirectional converter 2 through a cable, and the DC/AC bidirectional converter 2 corresponding to each group of battery stacks in series has the same structure and model; every two DC/AC bidirectional converters 2 are connected with a double-splitting transformer 3 through cables, the structure and the model of each double-splitting transformer 3 are the same, and the high-voltage alternating current ends of the two DC/AC bidirectional converters 2 corresponding to one double-splitting transformer 3 are respectively connected with one low-voltage winding of the transformer; all double split transformers 3 are wired into a switchgear cabinet 4.
Example 3
The utility model provides a series flow battery energy storage system which comprises any one of the series flow battery energy storage devices. According to the technical scheme of the embodiment, the system efficiency and the safety requirement of the energy storage device are improved by reducing the number of boosting stages and reducing power equipment such as system transformers; the problem that the performance of the cell stack is inconsistent due to the fact that the flow speed and the flow of electrolyte under the series pipeline are difficult to control is avoided, circulation is avoided, and the electric energy conversion efficiency of the flow battery energy storage device is improved. Therefore, the system efficiency of the energy storage device can be improved through the technical scheme of the embodiment.
It should be noted that: the series flow battery energy storage system can further comprise a plurality of series flow battery energy storage devices in any one of the above.
Example 4
The utility model provides an electric power system which comprises the series flow battery energy storage system.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may be made by those skilled in the art without departing from the principle of the utility model.
Claims (12)
1. A series flow battery energy storage device is characterized by comprising:
a plurality of positive and negative electrolyte storage tanks (1), wherein each pair of positive and negative electrolyte storage tanks (1) supplies liquid to one or more cell stacks through a pipeline pipe fitting;
the cell stacks supplied with liquid by different anode and cathode electrolyte storage tanks (1) are sequentially connected in series through a lead to form a group of series cell stacks; the group of series-connected cell stacks form a group of series-connected loops;
converter equipment, wherein the converter equipment comprises a DC/AC bidirectional converter (2), a double-split transformer (3) and a switch cabinet (4); the low-voltage direct-current end of the DC/AC bidirectional converter (2) is connected with a group of series battery stacks, and the high-voltage alternating-current end of the DC/AC bidirectional converter (2) is connected into a double-splitting transformer (3); every two DC/AC bidirectional converters (2) are connected with a double-split transformer (3); all double-split transformers (3) are connected into one or more switch cabinets (4) through cables, and each double-split transformer (3) is connected into only one switch cabinet (4).
2. The series flow battery energy storage device of claim 1, wherein: and the high-voltage alternating current ends of every two DC/AC bidirectional converters (2) are connected to one low-voltage winding of the double-split transformer (3).
3. The series flow battery energy storage device of claim 1, wherein: the electrolyte recycling device is characterized by further comprising a liquid path pump, wherein the liquid path pump is used for conveying the electrolyte in the positive and negative electrolyte storage tanks (1) into the battery stack and/or conveying the electrolyte in the battery stack back to the positive and negative electrolyte storage tanks (1).
4. The series flow battery energy storage device of claim 1, wherein: each pair of positive and negative electrolyte storage tanks (1) consists of a positive electrolyte storage tank and a negative electrolyte storage tank;
the positive electrolyte storage tank inputs positive electrolyte into the positive electrode of the cell stack through a positive electrode pump, and the positive electrolyte returns to the original positive electrolyte storage tank through a pipeline after flowing out of the positive electrode outlet of the cell stack;
the negative electrolyte storage tank inputs the negative electrolyte into the cathode of the cell stack through the negative pump, and the negative electrolyte returns to the original negative electrolyte storage tank through a pipeline after flowing out from the cathode outlet of the cell stack.
5. The series flow battery energy storage device of claim 1, wherein: the electrolytic bath device also comprises flow control valves, wherein the flow control valves are arranged on the liquid pipeline pipelines and used for adjusting the flow of the electrolyte in the liquid pipeline.
6. The series flow battery energy storage device of claim 1, wherein: a pair of positive and negative electrolyte storage tanks (1) supply liquid to a cell stack through a pipeline, each cell stack is independent, and the flow velocity and the flow of the electrolyte flowing through each cell stack are the same; the cell stacks supplied by different anode and cathode electrolyte storage tanks (1) are sequentially connected in series to form a group of series loops, each cell stack is only connected in one series loop, and the number of the cell stacks in each group of series loops is the same; the fluid systems of the stacks in the same series circuit are isolated from each other.
7. The series flow battery energy storage device of claim 1, wherein: a pair of positive and negative electrolyte storage tanks (1) supplies liquid to a plurality of cell stacks through pipeline pipe fittings, the cell stacks supplied with liquid from the same positive and negative electrolyte storage tank (1) are connected in parallel through pipelines, and the flow velocity and the flow rate of the electrolyte flowing through each cell stack are the same; the cell stacks supplied by different anode and cathode electrolyte storage tanks (1) are sequentially connected in series through a lead to form a group of series circuits, the number of the cell stacks in each group of series circuits is the same as the logarithm of the anode and cathode electrolyte storage tanks (1), and each cell stack is only connected in one series circuit; the fluid systems of the stacks in the same series circuit are isolated from each other.
8. The series flow battery energy storage device of claim 1, wherein: the DC/AC bidirectional converters (2) corresponding to different series circuits have the same structure and model.
9. The series flow battery energy storage device of claim 1, wherein: all double-split transformers (3) are connected into a switch cabinet (4) through cables.
10. A series flow cell energy storage system, comprising the series flow cell energy storage device of any one of claims 1-9.
11. The series flow battery energy storage system of claim 10, wherein: the number of the series flow battery energy storage devices is one or more than one.
12. An electrical power system comprising the series flow battery energy storage system of claim 10 or 11.
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