JPS5871570A - Electrolyte circulation type layer-built secondary battery - Google Patents

Abstract

PURPOSE:To reduce the loss of a flow pressure and obtain a sufficient rectifying effect of flow by making uneven each length of the obstacles in a microchannel and using a channel widened towards the microchannel side as a channel between a manifold and the microchannel. CONSTITUTION:Another manifold 5b and microchannel which are not shown in the figure are formed on the diagonal line in symmetry with a manifold 5b and a microchannel 10b. In the microchannel 10b, the obstacles L11...L1N, L21... L2N', and L31...L3N' which are divided in three lines and each of which has uneven length are formed in parallel to the electrolyte flowing-in out edge surface on an electrode plate 4. The dividion part W4 between the obstacles in three lines is arranged so that the directions of electrolyte flowing-in/out are shifted each other, and the channel 11 widened towards the microchannel side is formed to allow communication between the manifold 5b and the microchannel 10b.

Description

[Detailed Description of the Invention]) The present invention relates to an electrolyte circulating layer stacked secondary battery.
It evens out the flow rate and flow velocity distribution of the electrolytic solution being heated, and prevents the occurrence of overvoltage and uneven electrodeposition due to unevenness in the flow rate, flow velocity distribution, and density of the electrolytic solution generated on the electrode plate. Electrolyte circulation of this type of metal-halogen battery is designed to reduce flow pressure loss.
As an aII stacked secondary battery, the one shown in FIG. 1 is known. Figure 1 shows the main parts of this battery.
Electrodes 1 and separators 2 are alternately stacked. In this electrode 1, an electrode frame 3, an electrode plate 4, a, +7, and a hole 8 for passing through a bolt are bored, and a space formed by the electrode 2 is communicated. In this space, 1, for example, an electrolyte is supplied from the manifold 5b, and is discharged from the manifold 5m.
The distance d to the surface is 0.5 mn to 2. Omm
and narrowly.

Also, the vertical and horizontal distances of the electrode plates # and wK are long <
tw is 200 to 400 nm, so manifold 5b
The electrolyte from will even out the space above.

That is, it is difficult to make the flow uniform and parallel in the width W direction. Figure 142 shows a case where the flow of the electrolytic solution on the electrode plate 4 is non-uniform.

Figure 183 shows an ideally uniform case.

Conventionally, as a device for rectifying the flow of the electrolytic solution to make it uniform, a microchannel in which an obstacle is formed between the channels 9m and 9b and the space is known. Ib) The durability of the battery components (electrodes, separators, etc.) deteriorates as the internal pressure increases; IC) The increased internal pressure causes safety issues; Id) It is difficult to remove the gas generated inside the battery by leading it out of the battery.

In order to eliminate such drawbacks, the present applicant previously proposed an electrolyte circulation type laminated secondary battery in which the length of obstacles in the microchannel was made uneven (4I Application No. 1983-
742), but the effect of reducing flow pressure loss was not necessarily sufficient.

In addition to making the length t of the obstacles non-uniform, the present invention uses a channel between the manifold and the microchannel that is expanded toward the microchannel side,
An object of the present invention is to provide an electrolyte circulation type stacked secondary battery that can reduce flow pressure loss and provide a sufficient flow rectification effect.

-7+ This is a partially enlarged view of the electrode frame 6 of the electrode 1 of the A tertiary battery, and the nine microchannels 10b communicating with the manifold 5b are shown. Channel vignetting.

The microchannels 10a, 10tBc are divided into three rows of obstacles Ltt-LIN, L
*I++1LIN', LSI...Ls1/ are formed parallel to the electrolyte inflow/outflow end face of the electrode plate 4. These 3
The divided parts w4 of the row obstacles are provided so that the directions of inflow and outflow of the electrolyte are shifted from each other, and the manifolds 5m, 5b and l
An enlarged channel 11 of the cough microchannel is provided between the channels 10 and 10b and communicates with each other. 12 shows a plurality of rL-order obstacles provided in the channel 11. The above microchannels 10a, 10b
The size of the obstacle in is the electrode plate 40 width w = 177
When m, K is the number L mn ) shown in FIG.
At the distance wt=4mn from °LIM, there is an obstacle Lll'...
Distance between LlM and Let ``''l1mM' =
2,5 mn yC, obstacle Lshi"LIM' and L
The diameter of the distance Ws-2,5 from s I"・Lm)I' is for the above width @ = 177 nm, and these V are changed according to the change of ", and when the width W becomes - is 1 = w
It is good for multiplying each of the above dimensions as a tgk number.

A larger size is desirable because it affects the flow pressure loss, not just the uniformity of the flow, but in order to improve the two-area efficiency, etc.
The above value was set.

Obstacles Lll...L, M are LSI -1 (Lsj + L+j+s) in relation to obstacle Lll...L and M, as shown in Figure 6.
However, the dimensions are Lmj and L.
Between the obstacle tj++ and the obstacle -, an obstacle having a dimension L'lj is installed at a distance W4 from the L scoop and Lsj+*.

Furthermore, the above relational expression does not apply to the obstacle Lll.

The dimensions of the obstacles LsI...Lm)r are the same as in the case of the good obstacles Lx>...ILI as described with reference to FIG.

Also #: tj In the seventh factor O determined as shown in Figure 17, the obstacle La! ... Llli dimension Lsi =
7 L LIN 4-> ) -W4.

Said Jinsho Lll 0” LIN, L snow l...°L
Snow H', Lm+Pa.

However, for the manifold 5allK, the fault forces are arranged in a similar manner with line symmetry.

The arrangement of the obstacles mentioned above is also shown in Reference Photo 1. In addition, these obstacles make the flow uniform, as shown in reference photos 2 to 4.
Photo 4 shows the case of a medium speed of 50i and a high speed of 200゛←, and it can be seen that pre-rectification occurs in almost the entire flow velocity range.

), 1, - The force required to flow the electrolytic solution at a constant flow rate and the power consumed while the electrolytic solution exits the i-hold 5b is calculated as water pressure loss nlI! In terms of IHg, the magnitude of this loss depends on the channel shape and microchannel shape. Figure 8 shows the results of determining the pressure loss for the distance d = 1 mm as shown in Figure 8 to Kura-Later (2).
The magnitude of the former value (value indicated by
．． 2' to 1') is affected by the distance dK- and at the same time changes its shape, as shown in FIG. 9 and JIIl! 1
0, the channel of the type of the invention shown in FIG.
It can be seen that the KFi loss is small in the case of a channel with a shape enlarged to &.
Then, this flow pressure can be reduced.

[Brief explanation of drawings]

Figure w41 is one of the conventional electrolyte circulation type stacked secondary batteries that show false results.
! FIG. 211 and FIG. 5 are explanatory diagrams for explaining the flow of electrolyte in the electrode @. 415th! Q is a front view of essential parts showing one embodiment of the present invention. Figure Hatake 5 is a front view showing the method of obstacles in Figure 4, Figures 6 and #17 are obstacles in Figure IR4,! Explanatory diagrams explaining how to calculate the dimensions of objects, Figure A8 to Figure A811 show the measurement results of the flow pressure loss of the electrolyte.
7 "t'"Pa1°1"*QI'jll, JR?lW
Figure '11 is based on a conventional example. FIG. 12 shows the measurement data for the case of FIG. 8 with a tight fit. 1... Electrode, 3-Φ electrode frame, 4... Electrode plate, 5a, 5b
-・Manihole l/, IQb・・Microchannel, 1
1...Channel, 12...Obstacle, L'HI"LIH
, LIN =・Lui', Law -LsH"・・Obstacle. Patent applicant: Agency of Industrial Science and Technology

Claims (1)

[Claims] An electrode plate is provided in the electrode frame, a manifold is arranged diagonally in the electrode frame, and a microchannel communicating with the cough manifold is provided with symmetrical divided portions such that the directions of electrolyte inflow are shifted from each other, An electrolyte circulation*ai laminated secondary battery, characterized in that the manifold and the microchannel are communicated through a channel enlarged toward the wrinkled microchannel side, and a plurality of obstacles are formed in the cough channel Ka.