Novel high-temperature battery structure

Abstract

The utility model relates to a novel high-temperature battery structure which comprises a battery shell with an opening at one end, a battery core body, a support body, electrolyte and a battery cover, the battery shell and the battery cover form an accommodating cavity, the battery core body is a roll body, and the support body is arranged in the accommodating cavity. The battery core is formed by sequentially overlapping and winding a negative electrode assembly, first isolation insulation paper, a positive electrode assembly and second isolation insulation paper, a supporting cavity is formed in the middle of the battery core, the supporting body is inserted into the supporting cavity, the positive electrode assembly is of a multi-layer sheet structure comprising a negative electrode film, and the second isolation insulation paper is of a multi-layer sheet structure comprising a negative electrode film. And the negative electrode assembly is of a multi-layer sheet body structure comprising a lithium sheet. Due to the design of the three-layer positive electrode structure, the three-layer negative electrode structure and the supporting body, the effects of increasing the effective reaction area of the lithium sheet, increasing the conductive area, preventing the pole sheet from falling off and the like can be achieved, and the purposes of stable capacity / current, large-current discharge, high-temperature resistance and safety are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature batteries, in particular to a novel high-temperature battery structure. Background Art

[0002] High-temperature batteries, such as lithium-thionyl chloride batteries, are commonly used in high-temperature drilling environments. These primary inorganic non-aqueous electrolyte batteries offer a stable voltage platform, a wide operating temperature range, a long shelf life, and are free of heavy metals. Existing lithium-thionyl chloride battery cores consist of a positive electrode, a separator, and a lithium metal sheet. However, the existing single-layer positive electrode structure can lead to limited conductive area and low discharge power. The single-layer negative electrode structure can also lead to incomplete reactions, which can prevent the battery from reaching its rated capacity and cause unstable capacity and current. Utility Model Content

[0003] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a new high-temperature battery structure, comprising a battery shell with an opening at one end, a battery core, a support, an electrolyte and a battery cover, wherein the battery shell and the battery cover form a accommodating cavity, the battery core is a roll, which is formed by stacking and winding a negative electrode assembly, a first isolation insulating paper, a positive electrode assembly and a second isolation insulating paper in sequence, a support cavity is provided in the middle of the battery core, and the support body is inserted in the support cavity, the positive electrode assembly is a multi-layer sheet structure including a cathode film, and the negative electrode assembly is a multi-layer sheet structure including a lithium sheet.

[0004] Preferably, the positive electrode assembly comprises a cathode film upper layer, a nickel mesh interlayer, and a cathode film lower layer stacked in sequence. The cathode film upper layer, the nickel mesh interlayer, and the cathode film lower layer are all square in shape. The nickel mesh interlayer is provided with a lead.

[0005] Preferably, the lead is parallel to the width direction, and one end of the lead extends outside the cathode film, and the length of the lead is greater than the width of the nickel mesh interlayer.

[0006] Preferably, the negative electrode assembly includes a lithium sheet lower layer, a nickel wire interlayer and a lithium sheet upper layer stacked in sequence, the lithium sheet lower layer and the lithium sheet upper layer are equal in length and width, the nickel wire interlayer includes a plurality of nickel wires, and the plurality of nickel wires are equidistantly applied between the lithium sheet lower layer and the lithium sheet upper layer along the length direction.

[0007] Preferably, the number of the nickel wires is 1-5, and they are equidistantly applied between the upper and lower lithium sheets.

[0008] Preferably, the support body is cylindrical and is formed by bending a metal spring along a wide side, wherein the four corners of the metal spring are rounded.

[0009] Preferably, the first isolating insulating paper and the second isolating insulating paper are an integral structure and are folded when in use, with the second isolating insulating paper located at the top and the first isolating insulating paper located at the bottom, and the positive electrode assembly is sandwiched between the second isolating insulating paper and the first isolating insulating paper.

[0010] The utility model has the following beneficial effects:

[0011] The three-layer positive electrode structure, three-layer negative electrode structure and support body design of the utility model can increase the effective reaction area of the lithium sheet, increase the conductive area effect, and achieve the purpose of capacity / current stability, large current discharge and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Schematic diagram of the structure of the utility model

[0013] Figure 2 : Schematic diagram of the structure of the battery core,

[0014] Figure 3 : Structural diagram and structural decomposition diagram of the negative electrode assembly,

[0015] Figure 4 : Structural diagram and structural decomposition diagram of the positive electrode assembly,

[0016] Figure 5 : Schematic diagram of the assembly process of the positive electrode component and the insulator;

[0017] Figure 6 : The voltage / capacity-timetable of the existing lithium thionyl chloride battery with a single-layer positive electrode sheet structure and a single-layer negative electrode sheet structure at 150°C constant temperature discharge performance;

[0018] Figure 7 : The utility model is discharged at a constant temperature of 150 ℃ voltage / capacity - time table;

[0019] Explanation of the numbers in the figure: battery shell 1, battery cover 11, battery core 2, support body 3, cavity 20, negative electrode assembly 21, lithium sheet lower layer 213, nickel wire interlayer 212, lithium sheet upper layer 211, positive electrode assembly 22, cathode film upper layer 221, nickel mesh interlayer 222, cathode film lower layer 223, first isolation insulating paper 231, second isolation insulating paper 232. DETAILED DESCRIPTION

[0020] The technical solution in one embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention.

[0021] See also Figure 1-5 :

[0022] A new high-temperature battery structure includes a battery shell 1 with an opening at one end, a battery core 2, a support body 3, an electrolyte and a battery cover 11. The battery shell 1 and the battery cover 11 form a accommodating cavity 20. The battery core 2 is a coil, which is formed by stacking and winding a negative electrode assembly 21, a first isolation insulating paper 231, a positive electrode assembly 22 and a second isolation insulating paper 232 in sequence. A support cavity 20 is provided in the middle of the battery core 2, and the support body 3 is inserted in the support cavity 20. The positive electrode assembly 22 is a multi-layer sheet structure including a cathode film, and the negative electrode assembly 21 is a multi-layer sheet structure including a lithium sheet.

[0023] The positive electrode assembly 22 includes a cathode film upper layer 221, a nickel mesh interlayer 22, and a cathode film lower layer 223, which are stacked in sequence. The cathode film upper layer 221, the nickel mesh interlayer 22, and the cathode film lower layer 223 are all square in shape (and have equal areas). The positive electrode film upper layer is a carbon cathode film. The nickel mesh interlayer 22 is provided with a 2-5 cm long lead parallel to the width direction, and one end of the lead extends outside the cathode film. The length of the lead is greater than the width of the nickel mesh interlayer 22. Compared with the single-layer carbon cathode in the prior art, the three-layer structure of the positive electrode assembly 22 increases the total area of the carbon cathode film. Since the nickel mesh is disposed between the two carbon cathode films, the contact area between the carbon cathode film and the conductive nickel mesh is increased, thereby improving the conductivity rate and battery power, thereby improving the discharge stability and high-current discharge capability of the lithium thionyl chloride battery.

[0024] The negative electrode assembly 21 includes a lithium sheet lower layer 213, a nickel wire interlayer 212, and a lithium sheet upper layer 211, which are stacked in sequence. The length and width of the lithium sheet lower layer 213 and the lithium sheet upper layer 211 are equal. The nickel wire interlayer 212 includes five nickel wires, which are evenly spaced along the length between the lithium sheet lower layer 213 and the lithium sheet upper layer 211. Compared with the existing single-layer structure, the nickel wire interlayer 212 in this solution is located between the lithium sheet lower layer 213 and the lithium sheet upper layer 211. Therefore, the three-layer structure increases the stability of the nickel wire installation, increases the conductive contact area between the lithium sheet and the nickel wire, and increases the reaction amount and reaction speed of the lithium sheet, thereby improving the battery power and capacity of the lithium thionyl chloride battery.

[0025] The support body 3 is cylindrical and is formed by bending a metal spring along the wide side. At the same time, the four corners of the metal spring are rounded. Since the battery will produce sulfur dioxide gas during the reaction process and the lithium sheet will be gradually consumed, the presence of the support body 3 can effectively prevent the electrode from falling off, thereby avoiding the resulting voltage instability, even explosion and fire and other safety problems, and helping the battery to withstand high temperature.

[0026] The first isolation insulating paper 231 and the second isolation insulating paper 232 are an integral structure and are folded when in use. The second isolation insulating paper 232 is located at the top and the first isolation insulating paper 231 is located at the bottom. The positive electrode assembly 22 is sandwiched between the second isolation insulating paper 232 and the first isolation insulating paper 231 to facilitate the assembly of the first isolation insulating paper 231 and the second isolation insulating paper 232 with the positive electrode assembly 22, thereby improving production efficiency.

[0027] To produce the new high-temperature battery provided by the utility model, the production process includes the following steps:

[0028] Step 1: Assemble the positive electrode assembly 21. Step 1 completes the assembly of the cathode film as the lower layer, the nickel mesh as the middle layer, and the cathode film as the upper layer;

[0029] Step 2: Assemble the negative electrode assembly 22; Step 2 completes the assembly of the lower layer being the lithium sheet, the middle layer being the nickel mesh, and the upper layer being the lithium sheet;

[0030] Step 3: Assembling the battery core 2; After step 3 is completed, the positive electrode assembly 21 is stacked on the negative electrode assembly 22 and then wound to form a roll with a support cavity 20 in the middle;

[0031] Step 4: Assemble the support body 3. After step 4, insert the support body 3 into the support cavity 20 of the roll in step 3.

[0032] Step 4: The battery core 2 is welded to the inner wall of the battery shell 1.

[0033] Step 5: Cover and fix the battery housing 1;

[0034] Step 6: electrolyte perfusion;

[0035] Step 7: Dry.

[0036] The specific steps are:

[0037] Assembly of the positive electrode assembly 22: Take a piece of cathode film as the cathode film lower layer 223 and place it on the first work surface, take a piece of nickel mesh as the nickel mesh interlayer 22 and place it on the second work surface, dip the brush into the adhesive container to dip it in the adhesive, and then use the brush to brush the surface of the nickel mesh interlayer 22. After brushing, turn the nickel mesh interlayer 22 over and overlap it on the cathode film, then dip the brush into the adhesive container to dip it in the adhesive, and then use the brush to brush the surface of the nickel mesh interlayer 22, and finally take another piece of cathode film as the cathode film upper layer 221 and overlap it on the upper surface of the nickel mesh interlayer 22 to complete the assembly of the positive electrode assembly 22.

[0038] Assembly of the negative electrode assembly 21: Take a lithium sheet as the lithium sheet lower layer 213, take 5 nickel wires in turn, and lay them flat on the upper surface of the lithium sheet lower layer 213 at equal intervals along a direction parallel to the width of the lithium sheet lower layer 213. One end of the nickel wire extends out of the lithium sheet lower layer 213 to be welded to the inner side of the battery shell 1 after assembling the battery core 2. Then take another lithium sheet as the lithium sheet upper layer 211 and overlap it on the upper surface of the nickel wire. In this way, 5 nickel wires are sandwiched between the lithium sheet lower layer 213 and the lithium sheet upper layer 211 as a nickel wire interlayer 212, and use a compacting hammer to compact the nickel wire interlayer 212, the lithium sheet lower layer 213 and the lithium sheet upper layer 211 to complete the assembly of the negative electrode assembly 21.

[0039] Assembly of battery core 2,

[0040] Take a temporary winding rod and place it on one end of the negative electrode assembly 21. Wind the negative electrode assembly 21 one or two turns using the temporary winding rod.

[0041] Then take a piece of isolation fiber paper and fold it into two layers, with the lower layer serving as the first isolation insulating paper 231 and the upper layer serving as the second isolation insulating paper 232, and place the wide side of the positive electrode assembly 22 against the fold, and then overlap the second isolation insulating paper 232 on the positive electrode assembly 22 to form a positive electrode assembly separator, and then overlap the positive electrode assembly 22 separator on the surface of the negative electrode assembly 21, and place the folded end of the positive electrode assembly separator close to the winding end of the negative electrode assembly 21, and then use a temporary rolling rod to roll the cathode assembly separator and the anode assembly into a battery core 2, and finally, take out the temporary rolling rod so that there is a support cavity 20 in the middle of the battery core 2.

[0042] Place the battery core 2 in the housing;

[0043] Insert the support body 3 into the support cavity 20 of the battery core 2;

[0044] Use spot welding equipment to weld the nickel wire of the negative electrode assembly 21 to the inner wall of the shell, weld the positive electrode lead to the tab of the battery cover 11, and fix the battery cover 11 to the opening of the shell;

[0045] Filling the battery core 2 with electrolyte;

[0046] dry.

[0047] See Figure 6-7

[0048] Comparing the discharge performance of conventional lithium thionyl chloride batteries on the market with that of the new structure battery of the utility model at a constant temperature of 150°C, the test results are as follows: Figure 6As shown, it can be seen that the traditional lithium thionyl chloride battery on the market has poor high-temperature performance, and obvious energy decay occurs after about 9 hours of discharge, and the discharge capacity is only 14.9Ah. However, the new structure designed in the present invention ensures that the battery does not show obvious energy decay after about 15 hours of discharge, and the discharge capacity reaches 29.4Ah. This shows that the new battery structure provided by the present invention improves the battery discharge capacity and capacity stability, and improves the battery performance.

[0049] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A new high-temperature battery structure, characterized in that: It includes a battery shell with one end open, a battery core, a support, an electrolyte and a battery cover. The battery shell and the battery cover form a accommodating cavity. The battery core is a coil, which is formed by stacking and winding a negative electrode assembly, a first isolation insulating paper, a positive electrode assembly and a second isolation insulating paper in sequence. A support cavity is provided in the middle of the battery core, and the support body is inserted in the support cavity. The positive electrode assembly is a multi-layer sheet structure including a cathode film, and the negative electrode assembly is a multi-layer sheet structure including a lithium sheet.

2. A novel high-temperature battery structure according to claim 1, characterized in that: The positive electrode assembly includes a cathode film upper layer, a nickel mesh interlayer, and a cathode film lower layer stacked in sequence. The cathode film upper layer, the nickel mesh interlayer, and the cathode film lower layer are all square in shape, and the nickel mesh interlayer is provided with a lead.

3. A novel high-temperature battery structure according to claim 2, characterized in that: The lead is parallel to the width direction, and one end of the lead extends outside the cathode film. The length of the lead is greater than the width of the nickel mesh interlayer.

4. A novel high-temperature battery structure according to claim 1, characterized in that: The negative electrode assembly includes a lithium sheet lower layer, a nickel wire interlayer and a lithium sheet upper layer stacked in sequence. The length and width of the lithium sheet lower layer and the lithium sheet upper layer are equal. The nickel wire interlayer includes a plurality of nickel wires, and the plurality of nickel wires are equidistantly applied between the lithium sheet lower layer and the lithium sheet upper layer along the length direction.

5. A novel high-temperature battery structure according to claim 1, characterized in that: The number of nickel wires is 1-5, and they are equidistantly applied between the upper and lower lithium sheets.

6. A novel high-temperature battery structure according to claim 1, characterized in that: The support body is cylindrical and is formed by bending a metal spring along a wide side, wherein the four corners of the metal spring are rounded.

7. A novel high-temperature battery structure according to claim 1, characterized in that: The first isolation insulating paper and the second isolation insulating paper are an integrated structure and are folded when in use, with the second isolation insulating paper located on the top and the first isolation insulating paper located on the bottom, and the positive electrode assembly is sandwiched between the second isolation insulating paper and the first isolation insulating paper.

Images