A seawater-activated battery cell structure and performance evaluation method

Abstract

The present invention discloses a seawater-activated battery cell structure and a performance evaluation method. The seawater-activated battery cell structure includes a current collector post, a first sealing cover, a second sealing cover, a current collector plate, a negative electrode plate, an electrode frame, a copper mesh and a positive electrode plate; a first through hole is provided in the middle of the electrode frame, and the edge of the negative electrode plate is attached to the edge of the first through hole; a liquid inlet and a liquid outlet are correspondingly provided on the electrode frame; a plurality of flow disturbing posts are arranged on the negative electrode plate; a first flow guiding groove and a second flow guiding groove are provided on the electrode frame; one end of the first flow guiding groove is communicated with the liquid inlet of the electrode frame, and the other end is communicated with the negative electrode plate; one end of the second flow guiding groove is communicated with the liquid outlet of the electrode frame, and the other end is communicated with the negative electrode plate. In the seawater-activated battery of the present invention, the generation of seawater turbulence and eddy current can be reduced, so as to reduce the occurrence of uneven seawater distribution between the plates, and further improve the utilization rate of the positive and negative electrode plates.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a seawater-activated battery cell structure and a performance evaluation method therefor. Background Art

[0002] As a power generation device with short energy storage time, low maintenance frequency, strong load-carrying capacity and high energy density, seawater-activated batteries have been widely used in many fields such as communication, lighting and special equipment. Among them, the key components of seawater-activated batteries are the positive and negative electrodes and the bipolar plate. The former is the place where electrochemical reactions occur, and the latter is to provide the electrolyte required for electrochemical reactions, realize the electron transfer between the positive and negative plates, remove the by-products generated by electrochemical reactions, and play a certain supporting role (maintaining uniform stress on the positive and negative electrodes). Specifically, the bipolar plate uses the flow guiding channels engraved thereon to guide the flow of the electrolyte, ensuring that the electrolyte can be quickly and evenly distributed between the positive and negative plates, so that electrochemical reactions can occur and then discharge. If the design of the flow guiding channels is unreasonable, it will directly affect the flow characteristics of the electrolyte, resulting in uneven reactions at various parts of the electrodes, uneven current density distribution, and adverse phenomena such as low utilization of the positive and negative electrodes of the battery and local overheating, thus reducing the discharge performance of the battery. Therefore, the design of the flow guiding channels of the bipolar plate is directly related to the performance of seawater-activated batteries and the uniformity of the performance of each cell in the battery module.

[0003] The flow guiding structure of the bipolar plate in the existing seawater-activated battery cell structure generally adopts a vertical channel type, that is, after the electrolyte flows in from the inlet, it is shunted to the first branch channels on both sides, and then flows into the space between the positive and negative electrodes through the second branch channels preset perpendicular to the first branch channels to realize the electron transfer between the positive and negative electrodes and then discharge. Although this method can, to a certain extent, make the electrolyte flow into the space between the positive and negative plates and release the electrical energy of the battery, in the actual application of seawater-activated batteries, there is a 90° corner when the electrolyte flows from the inlet into the first branch channel, and there is also a 90° corner when it flows from the first branch channel into the second branch channel. The two large-angle deflections cause the electrolyte to violently impact the channel wall, resulting in a sharp change in the momentum of the electrolyte molecules, so that the electrolyte is unevenly distributed and flows into the space between the positive and negative plates, which greatly affects the utilization rate of the positive and negative plates and ultimately inhibits the energy efficiency of the battery body.

[0004] In summary, the research on the structure of seawater-activated battery cells is an effective research means to further improve the battery performance, and there are still deficiencies in the current design methods for the structure of seawater-activated battery cells.

[0005] Therefore, how to provide a seawater-activated battery cell structure with uniform liquid supply, safe and reliable, simple structure and easy processing, as well as a corresponding performance evaluation method, is a key problem to be solved urgently. Summary of the Invention

[0006] The present invention provides a seawater-activated battery single cell structure and a performance evaluation method. Through the design of the negative electrode plate and the electrode frame, the seawater-activated battery single cell structure can not only minimize the momentum conversion during the process of seawater flowing through the first flow channel area, the second flow channel area, the third flow channel area, and the fourth flow channel area, but also enable the seawater to flow into the negative electrode plate and the liquid outlet more quickly. In addition, by setting corresponding inclination angles at the connection between the first flow channel area and the second flow channel area, and between the third flow channel area and the fourth flow channel area, the turbulent kinetic energy of the seawater can be reduced, and the distribution uniformity of the seawater can be further improved. Therefore, the design of the seawater-activated battery single cell structure of the present invention has strong practical guiding significance. The specific content is as follows:

[0007] The present invention provides a seawater-activated battery single cell structure, including a current collector post, a first sealing cover, a second sealing cover, a current collector plate, a negative electrode plate, an electrode frame, a copper mesh, and a positive electrode plate;

[0008] Grooves are provided on the adjacent surfaces of the first sealing cover and the second sealing cover;

[0009] There are 2 current collector plates, which are respectively attached to the grooves on the first sealing cover and the grooves on the second sealing cover;

[0010] The positive electrode plate and the copper mesh are stacked on the current collector plate attached to the second sealing cover;

[0011] The negative electrode plate is attached to the current collector plate attached to the first sealing cover;

[0012] A first through hole is provided in the middle of the electrode frame, and the edge of the negative electrode plate is attached to the edge of the first through hole so that the negative electrode plate covers the first through hole;

[0013] The surfaces of the first sealing cover and the second sealing cover with grooves are both attached to the electrode frame;

[0014] The depth of the groove of the first sealing cover is the same as the thickness of the current collector plate;

[0015] The depth of the groove of the second sealing cover is the same as the total thickness of the current collector plate, the positive electrode plate, and the copper mesh;

[0016] Liquid inlets and outlets are correspondingly provided on the opposite frames of the electrode frame. Liquid inlets and outlets are provided on the second sealing cover. The liquid inlets and outlets of the electrode frame overlap with the liquid inlets and outlets of the second sealing cover for seawater to enter and exit the electrode frame;

[0017] A second through hole is provided in the center of the first sealing cover, and a third through hole is provided in the center of the second sealing cover. The number of current collector posts is 2, one is arranged on the second through hole, and the other is arranged on the third through hole; Among them,

[0018] A number of turbulence columns are provided on the negative electrode plate;

[0019] The electrode frame is provided with a first diversion groove and a second diversion groove; one end of the first diversion groove is communicated with the liquid inlet of the electrode frame, and the other end is communicated with the negative electrode plate; one end of the second diversion groove is communicated with the liquid outlet of the electrode frame, and the other end is communicated with the negative electrode plate;

[0020] The first diversion groove is used to guide seawater to be evenly distributed into the negative electrode plate; the second diversion groove is used to guide seawater to be evenly distributed to the liquid outlet of the electrode frame.

[0021] In some implementable ways, the first diversion groove includes a number of first branch diversion grooves, and the number of the first branch diversion grooves are arranged on both sides of the connection line between the center point of the liquid inlet of the electrode frame and the center point of the first through hole; one end of the first branch diversion groove is communicated with the liquid inlet of the electrode frame, and the other end is communicated with the negative electrode plate.

[0022] The first branch diversion groove includes a first flow channel area and a second flow channel area. One end of the first flow channel area is communicated with the liquid inlet of the electrode frame, and the other end is communicated with the second flow channel area; the end of the second flow channel area far from the first flow channel area is communicated with the negative electrode plate; the connection part between the first flow channel area and the second flow channel area has a deflection angle of 30° - 65°.

[0023] In some implementable ways, the second flow channel area includes 1 first outer edge acceleration flow channel groove and a number of first flow channel grooves; one end of the first outer edge acceleration flow channel groove and the first flow channel grooves are both communicated with the first flow channel area, and the other end is both communicated with the negative electrode plate.

[0024] In some implementable ways, the second diversion groove includes a number of second branch diversion grooves, and the number of the second branch diversion grooves are arranged on both sides of the connection line between the center point of the liquid outlet of the electrode frame and the center point of the first through hole; one end of the second branch diversion groove is communicated with the liquid outlet of the electrode frame, and the other end is communicated with the negative electrode plate.

[0025] The second branch diversion groove includes a third flow channel area and a fourth flow channel area. One end of the third flow channel area is communicated with the liquid outlet of the electrode frame, and the other end is communicated with the fourth flow channel area; the end of the fourth flow channel area far from the third flow channel area is communicated with the negative electrode plate; the connection part between the third flow channel area and the fourth flow channel area has a deflection angle of 30° - 65°.

[0026] In some implementable ways, the fourth flow channel area includes one second outer edge acceleration flow channel groove and multiple second flow channel grooves; one ends of the second outer edge acceleration flow channel groove and the second flow channel grooves are both communicated with the third flow channel area, and the other ends are both communicated with the negative electrode plate.

[0027] In some implementable ways, the width of one end of the first branch flow guiding groove connected to the liquid inlet of the electrode frame is 2 mm - 4 mm; the width of one end of the second branch flow guiding groove connected to the liquid outlet of the electrode frame is 2 mm - 4 mm;

[0028] The negative electrode plate is rectangular, with a length of 100 mm - 150 mm and a width of 100 mm - 150 mm;

[0029] One end of the flow disturbing column is fixedly connected to the bottom surface of the negative electrode plate, and the other end is on the same horizontal plane as the surface of the electrode frame where the negative electrode plate is arranged;

[0030] The interval between the several flow disturbing columns is 8 mm - 20 mm;

[0031] Both the first flow channel area and the third flow channel area are flow channels with an inclination angle of 30° - 60°;

[0032] The cross-sections of the first outer edge acceleration flow channel groove, the second outer edge acceleration flow channel groove, the first flow channel groove and the second flow channel groove are all rectangular, with a length of 3 mm - 5 mm and a width of 0.3 mm - 0.6 mm.

[0033] In some implementable ways, both the first outer edge acceleration flow channel groove and the first flow channel groove are of a gradually expanding type, and the gradually expanding width range is 1.3 mm - 5 mm; the interval range between the first outer edge acceleration flow channel groove and the first flow channel groove closest to the first outer edge acceleration flow channel groove is 1.5 mm - 4 mm, and the interval range between the first flow channel grooves is 1.5 mm - 4 mm;

[0034] The first outer edge acceleration flow channel groove includes a first buffer section flow channel groove and a first acceleration section flow channel groove; the length ratio of the first buffer section flow channel groove to the first acceleration section flow channel groove is 4:1;

[0035] Both the second outer edge acceleration flow channel groove and the second flow channel groove are of a gradually expanding type, and the gradually expanding width range is 1.3 mm - 5 mm; the interval range between the second outer edge acceleration flow channel groove and the second flow channel groove closest to the second outer edge acceleration flow channel groove is 1.5 mm - 4 mm, and the interval range between the second flow channel grooves is 1.5 mm - 4 mm;

[0036] The second outer edge acceleration flow channel groove includes a second buffer section flow channel groove and a second acceleration section flow channel groove; the length ratio of the second buffer section flow channel groove to the second acceleration section flow channel groove is 4:1.

[0037] In some implementable ways, the edge curve parameter of the first diversion groove is y;

[0038] Wherein, the expression of y is:

[0039]

[0040] In the formula, y is the edge curve parameter of the first diversion groove, G is the first length, h is the second length, D is the third length, x m is the first proportionality coefficient, y 0 is the first fitting coefficient, A 1 、A 2 are the second fitting coefficient and the third fitting coefficient, t 1 and t 2 are the fourth fitting coefficient and the fifth fitting coefficient.

[0041] In some implementable ways, the edge curve parameter of the second diversion groove is s;

[0042] Wherein, the expression of s is:

[0043]

[0044] In the formula, s is the edge curve parameter of the second diversion groove, E is the fourth length, f is the fifth length, P is the sixth length, z m is the second proportionality coefficient, s 0 is the sixth fitting coefficient, B 1 、B 2 are the seventh fitting coefficient and the eighth fitting coefficient, t 3 and t 4 are the ninth fitting coefficient and the tenth fitting coefficient.

[0045] The present invention also provides a method for evaluating the structural performance of a seawater-activated battery monomer, which is applied to the above-mentioned seawater-activated battery monomer structure, and the method includes:

[0046] S1, obtaining the negative plate speed value information, negative plate area information and negative plate time information; the negative plate speed value information includes the maximum value, the minimum value and the flow rate value sequence; the negative plate area information includes the negative plate gas phase area and the negative plate plate area; the negative plate time information includes the first time information, the second time information and the third time information;

[0047] S2, using the first battery structure model, calculate the maximum value, the minimum value and the flow rate value sequence to obtain the flow rate information of the seawater-activated battery single cell structure;

[0048] Among them, the first battery structure model is:

[0049]

[0050] In the formula, DCSC is the flow rate information, DY is the first correction parameter, MA is the maximum value, MI is the minimum value, and XL is the flow rate value sequence;

[0051] S3, using the second battery structure model, calculate the gas phase area of the negative electrode plate and the plate area of the negative electrode plate to obtain the proportion information of the seawater-activated battery single cell structure;

[0052] Among them, the second battery structure model is:

[0053]

[0054] In the formula, ZB is the proportion information, DE is the second correction parameter, QX is the gas phase area of the negative electrode plate, and JB is the plate area of the negative electrode plate;

[0055] S4, using the third battery structure model, calculate the first time information, the second time information and the third time information to obtain the flow rate time information of the seawater-activated battery single cell structure;

[0056] Among them, the third battery structure model is:

[0057] T = U1 * T1 + U2 * T2 + U3 * T3;

[0058] In the formula, T is the flow rate time information, T1 is the first time information, T2 is the second time information, T3 is the third time information, U1 is the third correction parameter, U2 is the fourth correction parameter, and U3 is the fifth correction parameter;

[0059] S5, according to the flow rate information, the proportion information and the flow rate time information of the seawater-activated battery single cell structure, perform a performance evaluation calculation on the seawater-activated battery single cell structure to obtain the performance evaluation result of the seawater-activated battery single cell structure;

[0060] Among them, the expression of the performance evaluation calculation is:

[0061] DCJG = a 1 * DCSC + a 2 * ZB + a 3 * T;

[0062] Wherein, DCJG is the performance evaluation result, and a 1 is the first correction factor, and a 2 is the second correction factor, and a 3 is the third correction factor, DCSC is the flow velocity information, ZB is the proportion information, and T is the flow velocity time information.

[0063] The beneficial effect of the present invention is that by providing a first diversion channel and a second diversion channel on the electrode frame and arranging a plurality of turbulence pillars on the negative electrode plate to form a diversion channel, it is used to guide seawater to move along the trajectory of the diversion channel. During this process, the electrode frame will guide the seawater to flow in the preset diversion channel trajectory. Such a design can reduce the generation of seawater turbulence and eddy currents, so as to reduce the uneven distribution of seawater between the plates, and further improve the utilization rate of the positive and negative electrode plates. In addition, through the performance evaluation method of the seawater-activated battery, it can effectively evaluate the performance of the design of the negative electrode plate and the electrode frame in the battery, thereby providing a performance evaluation basis for the battery structure. Description of the Drawings

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other embodiments can be obtained according to these drawings.

[0065] Figure 1 is the structural diagram of a seawater-activated battery single cell structure of the present invention;

[0066] Figure 2 is the split position diagram of the negative electrode plate and the electrode frame of a seawater-activated battery single cell structure of the present invention;

[0067] Figure 3 is the combined position diagram of the negative electrode plate and the electrode frame of a seawater-activated battery single cell structure of the present invention;

[0068] Figure 4 is the structural diagram of the first diversion channel and the second diversion channel of a seawater-activated battery single cell structure of the present invention;

[0069] Figure 5 is the structural diagram of the first branch diversion channel and the second branch diversion channel of a seawater-activated battery single cell structure of the present invention;

[0070] Figure 6 is the structural diagram of the second flow channel area and the fourth flow channel area of a seawater-activated battery single cell structure of the present invention;

[0071] Figure 7Position diagram of the first buffer section flow channel groove, the first acceleration section flow channel groove, the second buffer section flow channel groove, and the second acceleration section flow channel groove of a seawater-activated battery monomer structure according to the present invention;

[0072] Figure 8 Edge curve diagram of the first branch diversion groove of a seawater-activated battery monomer structure according to the present invention;

[0073] Figure 9 Edge curve diagram of the second branch diversion groove of a seawater-activated battery monomer structure according to the present invention;

[0074] Figure 10 Flow schematic diagram of a performance evaluation method for a seawater-activated battery monomer structure according to the present invention.

[0075] Description of reference numerals:

[0076] 1. Nut; 2. Bolt; 3. Current collector post; 4. First sealing cover; 5. Second sealing cover; 6. Current collector plate; 7. Negative electrode plate; 8. Electrode frame; 9. Copper mesh; 10. Positive electrode plate; 11. Screw hole; 12. Groove; 41. Second through hole; 51. Third through hole; 71. Turbulence column; 81. First through hole; 82. Liquid inlet; 83. Liquid outlet; 84. First diversion groove; 841. First branch diversion groove; 8411. First flow channel area; 8412. Second flow channel area; 84121. First outer edge acceleration flow channel groove; 841211. First buffer section flow channel groove; 841212. First acceleration section flow channel groove; 84122. First flow channel groove; 8413. Edge curve of the first branch diversion groove; 85. Second diversion groove; 851. Second branch diversion groove; 8511. Third flow channel area; 8512. Fourth flow channel area; 851211. Second buffer section flow channel groove; 851212. Second acceleration section flow channel groove; 8513. Edge curve of the second branch diversion groove; 85121. Second outer edge acceleration flow channel groove; 85122. Second flow channel groove. Detailed implementation manners

[0077] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0078] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0079] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] Embodiment 1

[0081] Refer to Figures 1 to 7 The present application provides a seawater-activated battery cell structure, including: a current collector post 3, a first sealing cover 4, a second sealing cover 5, a current collector plate 6, a negative electrode plate 7, an electrode frame 8, a copper mesh 9, and a positive electrode plate 10.

[0082] Grooves 12 are provided on the adjacent surfaces of the first sealing cover 4 and the second sealing cover 5.

[0083] There are two current collector plates 6, which are respectively attached to the grooves 12 of the first sealing cover 4 and the grooves 12 of the second sealing cover 5.

[0084] The positive electrode plate 10 and the copper mesh 9 are stacked on the current collector plate 6 attached to the second sealing cover 5.

[0085] The negative electrode plate 7 is attached to the current collector plate 6 attached to the first sealing cover 4.

[0086] A first through hole 81 is provided in the middle of the electrode frame 8, and the edge of the negative electrode plate 7 is attached to the edge of the first through hole 81 so that the negative electrode plate 7 covers the first through hole 81.

[0087] The surface of the first sealing cover 4 provided with the groove 12 and the surface of the second sealing cover 5 provided with the groove 12 are both attached to the electrode frame 8.

[0088] The depth of the groove of the first sealing cover 4 is the same as the thickness of the current collector plate 6.

[0089] The depth of the groove of the second sealing cover 5 is the same as the thickness of the superposition of the current collector plate 6, the positive electrode plate 10 and the copper mesh 9.

[0090] Liquid inlets 82 and outlets 83 are correspondingly provided on the opposite frames of the electrode frame 8. The second sealing cover 5 is provided with liquid inlets and outlets. The liquid inlets 82 and outlets 83 of the electrode frame overlap with the liquid inlets and outlets of the second sealing cover, and are used for seawater to enter and exit the electrode frame 8.

[0091] A number of screw holes 11 are provided on the first sealing cover 4, the electrode frame 8 and the second sealing cover 5. The nut 1 penetrates through the first sealing cover 4, the electrode frame 8 and the second sealing cover 5 and cooperates with the bolt 2 to fix the battery.

[0092] A second through hole 41 is provided at the center of the first sealing cover 4, and a third through hole 51 is provided at the center of the second sealing cover 5. The number of current collector posts 3 is 2. One is arranged on the second through hole 41, and the other is arranged on the third through hole 51; among them,

[0093] A number of flow disturbance posts 71 are provided on the negative electrode plate 7.

[0094] The number of flow disturbance posts 71 is used to enhance the flow rate of seawater inside the negative electrode plate.

[0095] The electrode frame 8 is provided with a first diversion groove 84 and a second diversion groove 85; one end of the first diversion groove 84 is communicated with the liquid inlet 82 of the electrode frame 8, and the other end is communicated with the negative electrode plate 7; one end of the second diversion groove 85 is communicated with the liquid outlet 83 of the electrode frame 8, and the other end is communicated with the negative electrode plate 7.

[0096] When the battery is operating normally, the first diversion groove 84 and the second diversion groove 85 cooperate with the negative electrode plate 7 to guide the seawater to flow in a preset path, so as to reduce the problem of uneven fluid distribution caused by different momenta of seawater in each part, so that the seawater can reach the negative electrode plate 7 evenly, and then reach the liquid outlet 83 of the electrode frame 8 from the negative electrode plate 7, thereby improving the diversion performance.

[0097] Preferably, the number of flow disturbance posts 71 is greater than 6. Exemplarily, the number of flow disturbance posts 71 is 81.

[0098] The first diversion groove 84 is used to guide the seawater to be evenly distributed into the negative electrode plate 7; the second diversion groove 85 is used to guide the seawater to be evenly distributed to the liquid outlet 83 of the electrode frame 8.

[0099] In an implementable manner, the first diversion channel 84 includes a plurality of first branch diversion channels 841, and the plurality of first branch diversion channels 841 are disposed on both sides of the line connecting the center point of the liquid inlet 82 of the electrode frame 8 and the center point of the first through hole 81; one end of the first branch diversion channel 841 communicates with the liquid inlet 82 of the electrode frame 8, and the other end communicates with the negative electrode plate 7.

[0100] The first branch diversion channel 841 includes a first flow channel area 8411 and a second flow channel area 8412. One end of the first flow channel area 8411 communicates with the liquid inlet 82 of the electrode frame 8, and the other end communicates with the second flow channel area 8412; the end of the second flow channel area 8412 away from the first flow channel area 8411 communicates with the negative electrode plate 7; the connection between the first flow channel area 8411 and the second flow channel area 8412 has a deflection angle of 30° - 65°, which is used to slow down the change in the momentum of seawater molecules flowing from the first flow channel area 8411 into the second flow channel area 8412 and improve the energy efficiency performance.

[0101] Exemplarily, the first branch diversion channel 841 is in the shape of a deer antler.

[0102] Preferably, the deflection angle at the connection between the first flow channel area 8411 and the second flow channel area 8412 is 40° or 60°.

[0103] In an implementable manner, the second flow channel area 8412 includes one first outer edge accelerating flow channel groove 84121 and a plurality of first flow channel grooves 84122; one end of the first outer edge accelerating flow channel groove 84121 and the first flow channel grooves 84122 communicates with the first flow channel area 8411, and the other end communicates with the negative electrode plate 7.

[0104] Preferably, the number of the first flow channel grooves 84122 is greater than 3. Exemplarily, the number of the first flow channel grooves 84122 is 6.

[0105] Optionally, the cross-sectional shapes of the first outer edge accelerating flow channel groove 84121 and the first flow channel grooves 84122 are rectangular, rounded rectangular, circular or square.

[0106] In an implementable manner, the second diversion channel 85 includes a plurality of second branch diversion channels 851, and the plurality of second branch diversion channels 851 are disposed on both sides of the line connecting the center point of the liquid outlet 83 of the electrode frame 8 and the center point of the first through hole 81; one end of the second branch diversion channel 851 communicates with the liquid outlet 83 of the electrode frame 8, and the other end communicates with the negative electrode plate 7.

[0107] The second diversion channel 851 includes a third flow channel area 8511 and a fourth flow channel area 8512. One end of the third flow channel area 8511 is communicated with the liquid outlet 83 of the electrode frame 8, and the other end is communicated with the fourth flow channel area 8512; One end of the fourth flow channel area 8512 away from the third flow channel area 8511 is communicated with the negative electrode plate 7; The connection part between the third flow channel area 8511 and the fourth flow channel area 8512 has a deflection angle of 30°-65°, which is used to slow down the change of the momentum of seawater molecules flowing from the fourth flow channel area 8512 into the third flow channel area 8511 and improve the energy efficiency performance.

[0108] Preferably, the deflection angle at the connection between the third flow channel area 8511 and the fourth flow channel area 8512 is 40° or 60°.

[0109] Exemplarily, the second diversion channel 851 is in the shape of antlers.

[0110] In an implementable way, the fourth flow channel area 8512 includes 1 second outer edge acceleration flow channel groove 85121 and several second flow channel grooves 85122; One ends of the second outer edge acceleration flow channel groove 85121 and the second flow channel grooves 85122 are both communicated with the third flow channel area 8511, and the other ends are both communicated with the negative electrode plate 7.

[0111] Preferably, the number of the second flow channel grooves 85122 is more than 3. Exemplarily, the number of the second flow channel grooves 85122 is 6.

[0112] Optionally, the cross-sectional shapes of the second outer edge acceleration flow channel groove 85121 and the second flow channel grooves 85122 are rectangular, rounded rectangular, circular or square.

[0113] In an implementable way, the width of one end of the first diversion channel 841 connected to the liquid inlet 82 of the electrode frame 8 is 2mm-4mm; The width of one end of the second diversion channel 851 connected to the liquid outlet 83 of the electrode frame 8 is 2mm-4mm.

[0114] Preferably, the width of one end of the first diversion channel 841 connected to the liquid inlet 82 of the electrode frame 8 is 3mm; The width of one end of the second diversion channel 851 connected to the liquid outlet 83 of the electrode frame 8 is 3mm.

[0115] The negative electrode plate 7 is rectangular, with a length of 100mm-150mm and a width of 100mm-150mm.

[0116] Preferably, the negative electrode plate 7 is square, with a length of 100mm and a width of 100mm.

[0117] One end of the flow disturbing column 71 is fixedly connected to the bottom surface of the negative electrode plate 7, and the other end is on the same horizontal plane as the surface of the electrode frame 8 where the negative electrode plate 7 is arranged.

[0118] The interval between several spoiler columns 71 is 8 mm - 20 mm.

[0119] Preferably, the interval between several spoiler columns 71 is 10 mm or 15 mm.

[0120] Optionally, the spoiler column 71 is cylindrical, elliptical cylindrical or regular quadrangular prism; when the spoiler column 71 is cylindrical, the circular diameter of the spoiler column 71 is 2 mm and the height is 0.5 mm.

[0121] Both the first flow channel area 8411 and the third flow channel area 8511 are flow channels with an inclination angle of 30° - 60°, which are used to slow down the change in the momentum of seawater molecules flowing from the liquid inlet 82 of the electrode frame 8 into the first flow channel area 8411 and the change in the momentum of seawater molecules flowing from the third flow channel area 8511 into the liquid outlet 83 of the electrode frame 8, and improve the energy efficiency performance.

[0122] Preferably, both the first flow channel area 8411 and the third flow channel area 8511 are flow channels with an inclination angle of 45°.

[0123] The cross-sections of the first outer edge accelerating flow channel groove 84121, the second outer edge accelerating flow channel groove 85121, the first flow channel groove 84122 and the second flow channel groove 85122 are all rectangles, with a length of 3 mm - 5 mm and a width of 0.3 mm - 0.6 mm.

[0124] Preferably, the length of the cross-sections of the first flow channel groove 84122 and the second flow channel groove 85122 is 4 mm and the width is 0.5 mm.

[0125] In an implementable way, both the first outer edge accelerating flow channel groove 84121 and the first flow channel groove 84122 are of a gradually expanding type, and the gradually expanding width range is 1.3 mm - 5 mm; the interval range between the first outer edge accelerating flow channel groove 84121 and the first flow channel groove 84122 closest to the first outer edge accelerating flow channel groove 84121 is 1.5 mm - 4 mm, and the interval range between the first flow channel grooves 84122 is 1.5 mm - 4 mm.

[0126] Exemplarily, the width of the narrow part of the first outer edge accelerating flow channel groove 84121 and the first flow channel groove 84122 is 1.3 mm, and the width of the wide part is 5 mm.

[0127] The first outer edge accelerating flow channel groove 84121 includes a first buffer section flow channel groove 841211 and a first accelerating section flow channel groove 841212; the length ratio of the first buffer section flow channel groove 841211 to the first accelerating section flow channel groove 841212 is 4:1, which is used to accelerate the seawater and guide the seawater to flow vertically into the negative electrode plate 7.

[0128] The second outer-edge accelerating flow channel groove 85121 and the second flow channel groove 85122 are both of a gradually expanding type, and the gradually expanding width ranges from 1.3 mm to 5 mm; the interval between the second outer-edge accelerating flow channel groove 85121 and the second flow channel groove 85122 closest to the second outer-edge accelerating flow channel groove 85121 ranges from 1.5 mm to 4 mm, and the interval between the second flow channel grooves 85122 ranges from 1.5 mm to 4 mm.

[0129] Exemplarily, the width of the narrow part of the second outer-edge accelerating flow channel groove 85121 and the second flow channel groove 85122 is 1.3 mm, and the width of the wide part is 5 mm.

[0130] The second outer-edge accelerating flow channel groove 85121 includes a second buffer-section flow channel groove 851211 and a second accelerating-section flow channel groove 851212; the length ratio of the second buffer-section flow channel groove 851211 to the second accelerating-section flow channel groove 851212 is 4:1, which is used to accelerate seawater and guide the seawater to vertically flow into the second diversion groove 85 from the negative electrode plate 7.

[0131] In an implementable way, the edge curve parameter of the first branch diversion groove 841 is y;

[0132] Wherein, the expression of the y is:

[0133]

[0134] In the formula, y is the edge curve parameter of the first branch diversion groove 841, G is the first length, h is the second length, D is the third length, x m is the first proportionality coefficient, y 0 is the first fitting coefficient, A 1 、A 2 are the second fitting coefficient and the third fitting coefficient, t 1 and t 2 are the fourth fitting coefficient and the fifth fitting coefficient.

[0135] It should be noted that Figure 8 is the edge curve graph of the first branch diversion groove 841, and the parameters G, h, D, x are specifically shown in the corresponding parameter markings in Figure 8 ; G is the height from the boundary of the liquid inlet 82 of the electrode frame 8 to the boundary of the negative electrode plate 7; h is the distance from the edge curve at 40 mm to the right of the y-axis in the figure to the x-axis, D is 40 mm, x is the length of the first section, x m is the ratio of the length of the first section to the sum of the lengths of the first section and the second section, y 0 is 39198.4622 ± 603749.83034, A 1 is 0.09035 ± 0.01627, A 2It is -39189.90205 ± 603749.83031, t 1 It is -2.28161 ± 0.08066, t 2 It is -283018.47173 ± 4360324.58886.

[0136] In an implementable way, the edge curve parameter of the second diversion groove 851 is s;

[0137] Among them, the expression of the s is:

[0138]

[0139] In the formula, s is the edge curve parameter of the second diversion groove 851, E is the fourth length, f is the fifth length, P is the sixth length, z m is the second proportionality coefficient, s 0 is the sixth fitting coefficient, B 1 、B 2 are the seventh fitting coefficient and the eighth fitting coefficient, t 3 and t 4 are the ninth fitting coefficient and the tenth fitting coefficient.

[0140] It should be noted that Figure 9 is the edge curve graph of the second diversion groove 851, and for the specific representations of the parameters E, f, P, z, refer to Figure 9 the corresponding parameter markings therein. E is the height from the boundary of the liquid outlet 83 of the electrode frame 8 to the boundary of the negative electrode plate 7; f is the distance from the edge curve at 40 mm to the right of the y-axis in the figure to the x-axis, P is 40 mm, z is the length of the first section, z m is the proportion of the length of the first section to the sum of the lengths of the first section and the second section, s 0 is 39198.4622 ± 603749.83034, B 1 is 0.09035 ± 0.01627, B 2 It is -39189.90205 ± 603749.83031, t 3 It is -2.28161 ± 0.08066, t 4 It is -283018.47173 ± 4360324.58886.

[0141] Embodiment 2

[0142] Refer to Figure 10 , a method for evaluating the structural performance of a seawater-activated battery monomer, the method includes:

[0143] S1. Obtain the negative plate speed value information, negative plate area information, and negative plate time information. The negative plate speed value information includes the maximum value, minimum value, and flow rate value sequence. The negative plate area information includes the negative plate gas phase area and the negative plate electrode area. The negative plate time information includes the first time information, the second time information, and the third time information.

[0144] It should be noted that the negative plate speed value information includes the maximum value, minimum value, and flow rate value sequence. A number of horizontal and vertical feature lines are set on the negative plate. Then, during the process of seawater flowing from the liquid inlet of the electrode frame to the liquid outlet of the electrode frame, the flow rates are continuously collected on the above-mentioned feature lines to obtain the flow rate value sequence, and through calculation and processing of the flow rate value sequence, the maximum value and minimum value of the flow rate are obtained.

[0145] It should be noted that the negative plate gas phase area refers to the area occupied by the gas in the channels formed by the negative plate, and the negative plate electrode area refers to the total area of the negative plate.

[0146] It should be noted that the negative plate time information means that the change of the liquid level height with time t after seawater enters the negative plate from the liquid inlet of the electrode frame is divided into three time periods, namely the Rapid 1 period, the Stable period, and the Rapid 2 period.

[0147] S2. Use the first battery structure model to calculate the maximum value, minimum value, and flow rate value sequence to obtain the flow rate information of the seawater-activated battery monomer structure.

[0148] Among them, the first battery structure model is:

[0149]

[0150] In the formula, DCSC is the flow rate information, DY is the first correction parameter, MA is the maximum value, MI is the minimum value, and XL is the flow rate value sequence.

[0151] It should be noted that the first correction parameter can be set or obtained according to historical data.

[0152] S3. Use the second battery structure model to calculate the negative plate gas phase area and the negative plate electrode area to obtain the proportion information of the seawater-activated battery monomer structure.

[0153] Among them, the second battery structure model is:

[0154]

[0155] In the formula, ZB is the proportion information, DE is the second correction parameter, QX is the negative plate gas phase area, and JB is the negative plate electrode area.

[0156] It should be noted that the second correction parameter can be set or obtained based on historical data.

[0157] S4. Using the third battery structure model, calculate the first time information, the second time information, and the third time information to obtain the flow velocity time information of the seawater-activated battery single cell structure;

[0158] Among them, the third battery structure model is:

[0159] T = U1 * T1 + U2 * T2 + U3 * T3;

[0160] In the formula, T is the flow velocity time information, T1 is the first time information, T2 is the second time information, T3 is the third time information, U1 is the third correction parameter, U2 is the fourth correction parameter, and U3 is the fifth correction parameter.

[0161] It should be noted that the third correction parameter, the fourth correction parameter, and the fifth correction parameter can be set or obtained based on historical data.

[0162] S5. According to the flow velocity information, the proportion information, and the flow velocity time information of the seawater-activated battery single cell structure, perform performance evaluation calculations on the seawater-activated battery single cell structure to obtain the performance evaluation result of the seawater-activated battery single cell structure.

[0163] Among them, the expression of the performance evaluation calculation is:

[0164] DCJG = a 1 * DCSC + a 2 * ZB + a 3 * T;

[0165] In the formula, DCJG is the performance evaluation result, a 1 is the first correction factor, a 2 is the second correction factor, a 3 is the third correction factor, DCSC is the flow velocity information, ZB is the proportion information, and T is the flow velocity time information.

[0166] It should be noted that the first correction factor, the second correction factor, and the third correction factor can be set or obtained based on historical data and are used to adjust the weights among the flow velocity information, the proportion information, and the flow velocity time information.

[0167] In the above embodiments, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0168] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "above", "below", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0169] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or mode are included in at least one embodiment or mode of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or modes. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or modes described in this specification and the features of different embodiments or modes.

[0170] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the structural performance of a seawater-activated battery cell, characterized in that: Applied to the seawater-activated battery monomer structure, the seawater-activated battery monomer structure includes a negative electrode plate and an electrode frame, the method includes: S1, obtaining negative plate velocity value information, negative plate area information and negative plate time information; the negative plate velocity value information includes a maximum value, a minimum value and a flow rate value sequence; the negative plate area information includes a negative plate gas phase area and a negative plate electrode area; the negative plate time information includes first time information, second time information and third time information; the flow rate value sequence is obtained by setting a plurality of horizontal characteristic lines and a plurality of vertical characteristic lines on the negative plate, and then continuously collecting the flow rate on the plurality of characteristic lines in the process of seawater flowing from the liquid inlet of the electrode frame to the liquid outlet of the electrode frame; the maximum value is the maximum value of the flow rate obtained by calculating and processing the flow rate value sequence; the minimum value is the minimum value of the flow rate obtained by calculating and processing the flow rate value sequence; the negative plate gas phase area is the area occupied by the gas in the channel formed by the negative plate; the change of the liquid level height after the seawater enters the negative plate from the liquid inlet of the electrode frame with time t is divided into three time periods, namely Rapid 1 period, Stable period and Rapid 2 period, and the first time information is Rapid The second time information is the time information of the Stable period, and the third time information is the time information of the Rapid 2 period; S2, using the first battery structure model, calculating the maximum value, the minimum value and the flow rate value sequence to obtain flow rate information of the seawater-activated battery monomer structure; Wherein, the first battery structure model is: In the formula, is the flow rate information, DY is the first correction parameter, MA is the maximum value, MI is the minimum value, and XL is the flow rate value sequence; S3, using the second battery structure model, calculating the gas phase area of ​​the negative electrode plate and the electrode area of ​​the negative electrode plate to obtain the proportion information of the seawater activated battery monomer structure; Wherein, the second battery structure model is: Wherein, ZB is the proportion information, DE is the second correction parameter, QX is the gas phase area of ​​the negative electrode plate, and JB is the plate area of ​​the negative electrode plate; S4, using a third battery structure model, calculating the first time information, the second time information and the third time information to obtain flow rate time information of the seawater-activated battery monomer structure; Wherein, the third battery structure model is: Wherein, T is the flow velocity time information, T1 is the first time information, T2 is the second time information, T3 is the third time information, U1 is the third correction parameter, U2 is the fourth correction parameter, and U3 is the fifth correction parameter; S5, performing a performance evaluation calculation on the seawater-activated battery monomer structure according to the flow rate information, the proportion information and the flow rate time information of the seawater-activated battery monomer structure to obtain a performance evaluation result of the seawater-activated battery monomer structure; Among them, the expression for performance evaluation calculation is: In the formula, is the performance evaluation result, is the first correction factor, is the second correction factor, is the third correction factor, is the flow rate information, For the proportion information, is the flow rate time information.

2. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 1, characterized in that: The seawater activated battery monomer structure also includes a current collecting column, a first sealing cover, a second sealing cover, a current collecting plate, a copper mesh and a positive plate; Adjacent surfaces of the first sealing cover and the second sealing cover are both provided with grooves; There are two current collecting plates, which are respectively correspondingly attached to the groove of the first sealing cover and the groove of the second sealing cover; The positive electrode plate and the copper mesh are stacked on the current collecting plate attached to the second sealing cover; The negative electrode plate is attached to the current collecting plate attached to the first sealing cover; A first through hole is provided in the middle of the electrode frame, and the edge of the negative electrode plate is in contact with the edge of the first through hole so that the negative electrode plate covers the first through hole; The surface of the first sealing cover provided with the groove and the surface of the second sealing cover provided with the groove are both attached to the electrode frame; The groove depth of the first sealing cover is the same as the thickness of the current collecting plate attached to the first sealing cover; The groove depth of the second sealing cover is the same as the superposition thickness of the current collecting plate, the positive electrode plate and the copper mesh attached to the second sealing cover; The electrode frame is provided with a liquid inlet and a liquid outlet, and the second sealing cover is provided with a liquid inlet and a liquid outlet, the liquid inlet of the electrode frame overlaps with the liquid inlet of the second sealing cover, and the liquid outlet of the electrode frame overlaps with the liquid outlet of the second sealing cover, so as to allow seawater to enter and exit the electrode frame; A second through hole is provided at the center of the first sealing cover, a third through hole is provided at the center of the second sealing cover, and the number of the current collecting posts is 2, one is provided on the second through hole, and the other is provided on the third through hole; wherein, A plurality of spoiler columns are arranged on the negative electrode plate; The electrode frame is provided with a first guide groove and a second guide groove; one end of the first guide groove is connected to the liquid inlet of the electrode frame, and the other end is connected to the negative electrode plate; one end of the second guide groove is connected to the liquid outlet of the electrode frame, and the other end is connected to the negative electrode plate; The first guide groove is used to guide the seawater to be evenly distributed into the negative electrode plate; the second guide groove is used to guide the seawater to be evenly distributed to the liquid outlet of the electrode frame.

3. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 2, characterized in that: The first flow guide groove includes a plurality of first branch flow guide grooves, and the plurality of first branch flow guide grooves are arranged on both sides of a line connecting the center point of the liquid inlet of the electrode frame and the center point of the first through hole; one end of the first branch flow guide groove is connected to the liquid inlet of the electrode frame, and the other end is connected to the negative electrode plate; The first branch flow guide groove includes a first flow channel area and a second flow channel area. One end of the first flow channel area is connected to the liquid inlet of the electrode frame, and the other end is connected to the second flow channel area; the end of the second flow channel area away from the first flow channel area is connected to the negative electrode plate; the connection between the first flow channel area and the second flow channel area is a deflection angle of 30°-65°.

4. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 3, characterized in that: The second flow channel area includes one first outer edge accelerating flow channel groove and a plurality of first flow channel grooves; one end of the first outer edge accelerating flow channel groove and the first flow channel groove are both connected to the first flow channel area, and the other end are both connected to the negative electrode plate.

5. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 4, characterized in that: The second flow guide groove includes a plurality of second branch flow guide grooves, and the plurality of second branch flow guide grooves are arranged on both sides of a line connecting the center point of the liquid outlet of the electrode frame and the center point of the first through hole; one end of the second branch flow guide groove is connected to the liquid outlet of the electrode frame, and the other end is connected to the negative electrode plate; The second branch guide groove includes a third flow channel area and a fourth flow channel area, one end of the third flow channel area is connected to the liquid outlet of the electrode frame, and the other end is connected to the fourth flow channel area; the end of the fourth flow channel area away from the third flow channel area is connected to the negative electrode plate; the connection between the third flow channel area and the fourth flow channel area is a deflection angle of 30°-65°.

6. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 5, characterized in that: The fourth flow channel area includes one second outer edge accelerating flow channel groove and a plurality of second flow channel grooves; one end of the second outer edge accelerating flow channel groove and the second flow channel groove are both connected to the third flow channel area, and the other end is connected to the negative electrode plate.

7. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 6, characterized in that: The width of one end of the first flow guide groove connected to the liquid inlet of the electrode frame is 2mm-4mm; the width of one end of the second flow guide groove connected to the liquid outlet of the electrode frame is 2mm-4mm; The negative electrode plate is rectangular, with a length of 100mm-150mm and a width of 100mm-150mm; The intervals between the plurality of spoiler columns are 8mm-20mm; The first flow channel area and the third flow channel area are both flow channels with an inclination angle of 30°-60°; The cross-section of the first outer edge accelerating flow channel groove, the cross-section of the second outer edge accelerating flow channel groove, the cross-section of the first flow channel groove and the cross-section of the second flow channel groove are all rectangular, with a length of 3mm-5mm and a width of 0.3mm-0.6mm.

8. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 7, characterized in that: The first outer edge accelerating flow channel groove and the first flow channel groove are both gradually expanding, and the gradually expanding width ranges from 1.3 mm to 5 mm; the interval range between the first outer edge accelerating flow channel groove and the first flow channel groove closest to the first outer edge accelerating flow channel groove is 1.5 mm to 4 mm, and the interval range between the first flow channel grooves is 1.5 mm to 4 mm; The first outer edge accelerating channel groove comprises a first buffer section channel groove and a first accelerating section channel groove; the length ratio of the first buffer section channel groove to the first accelerating section channel groove is 4:1; The second outer edge accelerating flow channel groove and the second flow channel groove are both gradually expanding, and the gradually expanding width ranges from 1.3 mm to 5 mm; the interval range between the second outer edge accelerating flow channel groove and the second flow channel groove closest to the second outer edge accelerating flow channel groove is 1.5 mm to 4 mm, and the interval range between the second flow channel grooves is 1.5 mm to 4 mm; The second outer edge acceleration flow channel groove includes a second buffer section flow channel groove and a second acceleration section flow channel groove; the length ratio of the second buffer section flow channel groove to the second acceleration section flow channel groove is 4:

1.

9. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 3, characterized in that: The edge curve parameter of the first diversion channel is y; Wherein, the expression of y is: Wherein, y is the edge curve parameter of the first branch guide groove, G is the first length, h is the second length, and D is the third length. is the first proportionality coefficient, is the first fitting coefficient, , are the second fitting coefficient and the third fitting coefficient, t 1 and t 2 is the fourth fitting coefficient and the fifth fitting coefficient, the first length is the height from the boundary of the liquid inlet of the electrode frame to the boundary of the negative plate, the second length is the distance from the edge curve 40 mm to the right of the y-axis to the x-axis, the third length is 40 mm, and the first proportional coefficient is the ratio of the first section length of the edge curve of the first branch guide groove to the third length.

10. The method for evaluating the structural performance of a seawater-activated battery cell according to claim 5, characterized in that: The edge curve parameter of the second diversion trough is s; Wherein, the expression of s is: Wherein, s is the edge curve parameter of the second branch guide groove, E is the fourth length, f is the fifth length, P is the sixth length, is the second proportionality coefficient, is the sixth fitting coefficient, , are the seventh and eighth fitting coefficients, t 3 and t 4 is the ninth fitting coefficient and the tenth fitting coefficient, the fourth length is the height from the liquid outlet boundary of the electrode frame to the negative plate boundary, the fifth length is the distance from the edge curve 40 mm to the right of the y-axis to the x-axis, the sixth length is 40 mm, and the second proportional coefficient is the ratio of the first section length of the edge curve of the second branch guide groove to the sixth length.

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