Battery cases, single cells and large capacity batteries

Abstract

The present application provides a battery case, a cell, and a large-capacity battery, the battery case having a dissolving mechanism that penetrates the interior of the battery case from the outside when the dissolving mechanism comes into contact with an electrolyte. The battery case has a simple structure and a case structure that can communicate the electrolyte chambers of the cells without requiring mechanical operation, and places the cells in a uniform electrolyte system, thereby improving the performance of the battery.

Description

[Technical Field]

[0001] This application relates to the field of battery technology, and more particularly to battery cases, cells, and large capacity batteries. [Background technology]

[0002] Lithium batteries have many advantages and are widely used in various fields. In conventional lithium battery applications, it is often necessary to connect multiple cells in parallel to meet the requirements of high-capacity applications. When multiple cells are connected in parallel to form a high-capacity battery, the performance parameters of each cell, such as capacity, resistance, and voltage, vary, affecting the overall performance of the high-capacity battery. Furthermore, after a certain period of operation, the parallel-connected cells consume electrolyte at different rates, resulting in significant differences in performance among the cells. This leads to poor uniformity among the cells and further affects the overall performance and service life of the high-capacity battery. Therefore, in order to improve the performance and service life of the high-capacity battery, it is necessary to address the consistency issue among the cells.

[0003] This allows the electrolyte of multiple cells to circulate between each other, ensuring that the multiple cells are in a uniform electrolyte system and solving the problem of poor consistency between the individual cells due to different electrolyte consumption, but the issue of how to connect the electrolyte chambers of the multiple cells with the electrolyte chamber of the large-capacity battery remains to be resolved. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a battery case, a cell, and a large-capacity battery, and the battery case has a simple structure that allows the electrolyte chambers of each cell to communicate with each other without requiring mechanical operation, so that multiple cells can be in a uniform electrolyte system. [Means for solving the problem]

[0005] The technical solutions of the present application are as follows:

[0006] The present application provides a battery case having a dissolving mechanism that allows at least a portion of the battery case to be dissolved in an electrolyte solution.

[0007] Furthermore, a case opening is provided in the battery case, and the case opening is sealed by the dissolution mechanism. The dissolution mechanism includes a dissolution base layer. When the dissolution base layer comes into contact with the electrolyte, the dissolution base layer dissolves, opening the case opening and connecting the interior of the battery case to the outside.

[0008] Furthermore, the material of the dissolving base layer is at least one of polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, styrene-butadiene copolymer, and polystyrene, and preferably a polyamide dissolving base layer such as polydodecanamide or polyamide.

[0009] Furthermore, the dissolution mechanism further includes an isolation layer attached to the inner surface of the dissolution base layer, the inner surface of the dissolution base layer being the surface facing the inner chamber of the battery case.

[0010] Furthermore, the separator is a film that is insoluble in the electrolyte.

[0011] Furthermore, the isolation layer is an isolation coating layer applied to the inner surface of the dissolving base layer, and the isolation coating layer includes an adhesive and a solvent, the adhesive being at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethylcellulose, and polyvinyl alcohol, and the solvent being at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylformamide, dimethyl sulfoxy, tetrahydrofuran, and water or alcohols, and the isolation layer adheres the dissolving base layer to the case opening.

[0012] Additionally, a cradle is provided within the through passageway for placing the melting mechanism.

[0013] Furthermore, the battery case is a dissolving mechanism, and the material of the battery case is at least one of polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer.

[0014] Furthermore, the dissolving mechanism includes an isolation assembly and a dissolving assembly, the battery case has at least one case opening, the isolation assembly and the dissolving assembly are sequentially provided in the case opening along a direction away from the battery case, the isolation assembly is pressed by the dissolving assembly to seal the case opening together, and when the dissolving assembly comes into contact with the electrolyte outside the battery case, the isolation assembly is opened by the dissolution of the dissolving mechanism, penetrating the inside and outside of the battery case.

[0015] Furthermore, the isolation assembly is a sphere or a cone.

[0016] Furthermore, the dissolving mechanism includes an isolation assembly, a dissolving assembly, and a push-up assembly, and the battery case has at least one case opening, and the isolation assembly and the dissolving assembly are sequentially provided in the case opening along a direction away from the battery case interior, and the isolation assembly is pressed by the dissolving assembly to seal the case opening together, and when the dissolving assembly comes into contact with the electrolyte outside the battery case, the isolation assembly is opened by the dissolution of the dissolving mechanism, penetrating the inside and outside of the battery case.

[0017] Furthermore, the push-up assembly includes a fixed portion and a resilient member, the resilient member being a spring, and the fixed portion and dissolving assembly cause the spring to be in a compressed state.

[0018] Furthermore, the battery case is provided with an attachment portion having a through-hole, and the dissolving mechanism includes a base, a connecting pipe protruding from the base, and a dissolving assembly, the base is provided with a through-hole that passes through the connecting pipe, the dissolving assembly is provided within the connecting pipe, the connecting pipe is sealed by the dissolving assembly, the connecting pipe passes through the mounting hole from the inside to the outside of the battery case, the base is sealably attached to the attachment portion, and when the electrolyte passes through the dissolving assembly from the outside to the inside of the battery case, the dissolving mechanism is dissolved and opened, allowing the electrolyte to enter the inside of the battery case.

[0019] Furthermore, the mounting hole is a stepped hole including a first hole and a second hole arranged sequentially from the inside to the outside of the battery case, the diameter of the first hole is larger than the diameter of the second hole, the base is drilled into the first hole, and the connecting pipe is drilled into the second hole.

[0020] Furthermore, the dissolving mechanism further includes a nut, a gasket, and a seal ring, the connecting tube has a male thread that matches the nut, the nut is provided outside the battery case and connected to the male thread of the connecting tube, the gasket is provided between the mounting portion and the nut, and the seal ring is provided between the base and the mounting portion.

[0021] Furthermore, the dissolvable assembly includes a dissolvable sheet that is soluble in the electrolyte and a protective film that is insoluble in the electrolyte, and the protective film is provided on a surface of the dissolvable sheet that faces the inside of the battery case, and seals and isolates the battery case.

[0022] Furthermore, the dissolving mechanism further includes a pressing member that presses and fixes the dissolving assembly, the inside of the pressing member being hollow and penetrating the connecting pipe to be tightly connected to the connecting pipe.

[0023] Furthermore, a case opening is provided in the case body of the battery case, and the dissolution mechanism is provided on the outer surface of the case body and covers the case opening, and the dissolution mechanism includes a dissolution layer and an isolation layer, the dissolution layer can be dissolved in an electrolyte, the isolation layer is a metal plating layer on the inner surface of the dissolution layer, and the inner surface of the dissolution layer is the surface of the dissolution layer facing the interior of the battery case.

[0024] Furthermore, the metal plating layer is an aluminum plating layer or a copper plating layer, and the thickness of the metal plating layer is 200 angstroms to 800 angstroms. A metal ring is provided between the case body and the melting mechanism, and a projection of the inner area of ​​the metal ring covers the case opening area. A hot-melt adhesive layer is provided between the metal ring, the melting mechanism, and the case body.

[0025] Furthermore, a single-layer or multi-layer filter membrane is provided between the case body and the dissolution mechanism, and the filter membrane covers the case opening. After the dissolution mechanism dissolves, the electrolyte outside the battery case passes through the filter membrane and enters the interior of the battery case.

[0026] Furthermore, a ring-shaped adhesive layer is provided between the filter membrane and the case body and the dissolving mechanism, and the filter membrane, the case body, and the dissolving mechanism are adhesively fixed together by the ring-shaped adhesive layer, and the projection of the inner area of ​​the ring of the ring-shaped adhesive layer covers the case opening area.

[0027] Furthermore, the filter membrane material is one of a polytetrafluoroethylene (PTFE) microporous membrane, a polyethylene (PE) microporous membrane, a polypropylene (PP) microporous membrane, or a filter paper.

[0028] Furthermore, the material of the hot melt adhesive layer / ring-shaped adhesive layer is one of epoxy resin, modified polypropylene, modified polyethylene, and tab adhesive.

[0029] Furthermore, the battery case is provided with a protrusion having a central through-hole, the dissolving mechanism includes a cap and a dissolving sheet, the cap is provided with a through-hole and fixed to the protrusion, the dissolving sheet is provided between the cap and the protrusion, seals the central through-hole, and the dissolving sheet can be dissolved in the electrolyte.

[0030] Furthermore, the cap may be made of a flexible metal material and fixed to the protrusion by riveting, or the cap may be made of a flexible rubber material and fixed to the protrusion by its elasticity, or the cap and the protrusion may be fixed by screw connection.

[0031] Furthermore, a metal plating layer that is insoluble in the electrolyte is applied to the surface of the dissolvable sheet facing the interior of the battery case, and a protective layer is applied to the surface of the metal plating layer.

[0032] Furthermore, the battery case further includes a filter membrane that is provided in the central through-hole and is located on the protective layer closer to the inside of the battery case.

[0033] Furthermore, the dissolution mechanism is clamped to the opening of the battery case so that the opening of the battery case can be opened after the cell is immersed in the electrolyte, and at least a portion of the dissolution mechanism is dissolvable in the electrolyte.

[0034] Furthermore, the dissolving mechanism is a clamping member that is hollow inside and has a slit, and the clamping member applies a clamping force to the opening of the battery case by its own elastic restoring force.

[0035] Furthermore, the dissolving mechanism includes a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate together apply a clamping force to the opening of the battery case, thereby achieving a tight seal.

[0036] Furthermore, the first clamping plate and the second clamping plate are fixed together by riveting or bolting, and the rivets or bolts are made of a material that is soluble in the electrolyte.

[0037] Furthermore, the dissolving mechanism includes an outer clip and an inner support, both of which are hollow tubular structures with a C-shaped cross section, and the inner support is located within the outer clip, and the inner support and the outer clip together clamp the opening portion of the soft package battery case.

[0038] Furthermore, the battery case is used to accommodate an electrode assembly and an electrolyte, and is a dissolving mechanism including a main body layer having an outer surface and an inner surface, an adhesive layer and a heat seal layer are sequentially provided on the inner surface along a direction away from the main body layer, an adhesive layer and a protective layer are sequentially provided on the outer surface along a direction away from the main body layer, the inner surface is a surface facing the battery case interior chamber, and the outer surface is a surface away from the battery case interior chamber, the main body layer is a porous metal foil layer and is used to communicate between the inside of the battery case and the outside electrolyte, and the adhesive layer and the protective layer are soluble in the electrolyte.

[0039] Furthermore, a protective layer that dissolves in the electrolyte solution is further provided between the adhesive layer and the heat seal layer.

[0040] Furthermore, the main layer is a single-layer or multi-layer porous metal foil, the pores of the porous metal foil are circular and have a pore diameter of 0.5 mm to 1 mm, the protective layer is a nylon PA6 protective layer and has a thickness of 10 to 50 μm, the adhesive layer is a waterproof adhesive layer, the adhesive layer is a polyurethane layer, the adhesive layer is used to bond the main layer and the protective layer / heat-seal layer, and the heat-seal layer is a composite layer made of a hot-melt blend of polypropylene (CPP) and nylon PA6.

[0041] The present application further provides a cell whose case is the battery case described in any one of the above aspects.

[0042] Furthermore, the battery case is sealed by an upper cover assembly, and at least one soft package cell is provided inside, the soft package cell's sealing bag has an opening, the upper cover assembly is provided with a positive electrode post, a negative electrode post, and a burst relief valve, and the positive electrode tab and negative electrode tab of the soft package cell are electrically connected to the positive electrode post and negative electrode post of the upper cover assembly by a conductive connection sheet.

[0043] The present application further provides a large-capacity battery including at least two of the above-described cells and a multi-drop liquid storage conduit, wherein the multi-drop liquid storage conduit includes a main conduit and at least two branch pipes, a liquid storage chamber for storing electrolyte is provided in the main conduit, and the branch pipes are connected to case openings in a one-to-one correspondence.

[0044] The present application further provides a large-capacity battery including an outer case and a plurality of the above-described cells, wherein an electrolyte chamber is provided within the outer case, the electrolyte chamber is filled with an electrolyte, and the cells are housed in the electrolyte chamber. [Effects of the Invention]

[0045] The beneficial effects of the technical solution of the present application are as follows:

[0046] 1. This application provides a dissolving mechanism in the battery case of a single cell, which is installed in the case opening of the battery case. When the battery is in its natural state, the dissolving mechanism can seal the battery case to isolate the interior of the battery case from the outside. When the dissolving mechanism is placed in external electrolyte, the dissolving mechanism can be dissolved by the electrolyte outside the battery case, allowing the electrolyte to flow into the inside of the battery case. This enables the injection of electrolyte into the single cell and the formation of a single cell into a unified electrolyte system, which reduces the differences between the individual cells caused by different electrolyte consumption rates, improves the consistency and stability of the individual cells, and thereby improves battery performance.

[0047] 2. The polyamide dissolving base layer of the dissolving mechanism in the battery case of the present invention becomes hydrophilic after being dissolved by the electrolyte, has good water absorption, and can capture moisture in the electrolyte, playing the role of an electrolyte additive, and also improving the cycle performance and stability of the lithium-ion battery.

[0048] 3. The battery case of the present application has a simple structure and is easy to install. The isolation layer of the dissolving mechanism has an adhesive effect, so that the dissolving assembly can be installed simply by adhering it to the case opening.

[0049] 4. The battery case of the present invention is easy to manufacture, reliable to use, and allows multiple cells to share an electrolyte without requiring mechanical manipulation, making it highly applicable.

[0050] 5. The battery case provided herein has a dissolving mechanism covering the case opening. The dissolving layer in the dissolving mechanism is dissolvable in the electrolyte, and the metal plating layer on the dissolvable layer prevents the electrolyte inside the battery case from dissolving the dissolvable layer. When there is no electrolyte outside the battery, the metal plating layer prevents the electrolyte inside the battery from dissolving the dissolvable layer, thereby achieving a sealed interior of the battery. When multiple cells having this battery case are placed in the electrolyte chamber of a large-capacity battery, the electrolyte outside the battery case dissolves the dissolvable layer. After the dissolvable layer is dissolved, the metal plating layer ruptures, allowing the electrolyte to enter the inner chamber of the battery case through the case opening, creating a common electrolyte environment for the multiple cells. This reduces the differences between the individual cells due to different electrolyte consumption rates and improves the consistency and lifespan of the individual cells.

[0051] 6. The filter membrane structure of the battery case of the present application allows the electrolyte to pass freely, but prevents impurities such as solid particles from passing through the filter membrane. This prevents metal fragments and insoluble matter remaining after the dissolving sheet dissolves from entering the battery, affecting battery performance and ultimately causing a short circuit.

[0052] 7. In this application, a battery case is provided with a protrusion having a central through-hole. When a cell containing this battery case is in a normal state, the battery case is sealed by a dissolving mechanism, isolating the electrolyte inside the cell from the outside. When one or more cells containing this battery case are placed in the electrolyte chamber of a large-capacity battery, the dissolving sheet dissolves, allowing the external electrolyte to enter the cell through the protrusion on the case, thereby connecting the electrolyte chamber of the cell with the electrolyte chamber of the large-capacity battery, and the multiple cells are in a common electrolyte system. This structure directly fastens the dissolving sheet using a cap. Compared with conventional hot-melt methods, this battery case's dissolving mechanism fastening method is simple and easy to operate, with good sealing effect after fastening and a high yield rate.

[0053] 8. The cap of the dissolving mechanism in this application can be connected to the protrusion of the battery case by riveting or by its own elastic or screw connection to achieve a fixed seal of the dissolving sheet, which makes the connection more reliable and makes operation and assembly easier.

[0054] 9. In this application, a plurality of cells having the dissolving mechanism are connected in parallel to form a group, and then placed in a housing of a large-capacity battery filled with electrolyte. Under the action of the electrolyte, part or all of the dissolving mechanism dissolves, and the electrolyte enters the interior of the cells through the openings, so that the plurality of cells are in a common electrolyte system, reducing the difference in each cell due to different electrolyte consumption and improving the performance and service life of the entire large-capacity battery.

[0055] 10. The battery case of the present invention is provided with a dissolving mechanism that can dissolve in electrolyte, and the opening can be automatically opened without the need for mechanical operation, enabling multiple cells to share the electrolyte. The dissolving mechanism has a simple structure, is small in volume, is easy to use, and is flexible.

[0056] 11. The battery case provided in this application is mainly composed of a main layer having a porous metal foil, a protective layer whose inner and outer surfaces are dissolvable in electrolyte, and a heat-sealing layer bonded together. Because the materials of the protective layer and heat-sealing layer are dissolvable in electrolyte, when multiple cells having this soft-packaged battery case are placed in the electrolyte compartment of a large-capacity battery, the protective layer and heat-sealing layer will themselves be dissolved by the electrolyte, and the electrolyte will penetrate the main layer having the porous metal foil, immersing part or all of the electrode assembly in the electrolyte, so that the multiple cells are in a common electrolyte environment. This reduces individual differences between batteries caused by different electrolyte consumption and improves the consistency and lifespan of each cell.

[0057] 12. The battery case of the present application allows multiple cells to share an electrolyte without the need for mechanical manipulation, and is manufactured from multiple materials that are soluble in the electrolyte. Since the time it takes for various materials to dissolve in the electrolyte varies, the dissolution time of the battery case can be adjusted by adjusting the materials used for each layer. Furthermore, the battery case is easy to manufacture and reliable to use.

[0058] 13. In this application, a soft-packaged cell is pre-filled and capacity graded, and then a soft-packaged cell with good matching is selected. A plurality of soft-packaged cells are connected in parallel and enclosed in a battery case. A dissolving mechanism is provided in the battery case. When the battery is in a natural state, the battery is isolated from the outside, and one or more batteries are placed in an external electrolyte, the dissolving mechanism is opened and electrolyte is injected into the battery, thereby realizing the injection of electrolyte into the battery and the formation of multiple batteries into a unified electrolyte system.

[0059] 14. The soft-packaged cells in the battery of the present application have good uniformity, resulting in a good yield of manufactured batteries. Furthermore, the batteries have a unified electrolyte system, which reduces the problem of inconsistent battery performance caused by uneven electrolyte consumption during battery use. This results in good battery uniformity and improves the service life and stability of the batteries.

[0060] Other advantages, goals and features of the present application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art through study and practice of the present application. [Brief explanation of the drawings]

[0061] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly describe the drawings necessary for describing the embodiments or existing technologies. However, the drawings in the following description are only some embodiments of the present application, and it is obvious that a person skilled in the art can also obtain other accompanying drawings based on these drawings without any creative efforts. [Figure 1] FIG. 2 is a schematic structural diagram of a battery case according to Example 1 of the present application. [Figure 2] FIG. 2 is a schematic structural diagram of a battery case according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a schematic structural diagram of a battery case according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a schematic structural diagram of a battery case according to Example 4 of the present invention. [Figure 5] FIG. 10 is a schematic structural diagram of a battery case in Example 5 of the present application. [Figure 6] FIG. 1 is a schematic structural diagram of a dissolution assembly in Example 5 of the present application. [Figure 7] FIG. 1 is a schematic structural diagram of a large-capacity battery according to Examples 1 to 6 of the present application. [Figure 8] FIG. 10 is a schematic structural diagram of a battery case in Example 7 of the present application. [Figure 9] FIG. 10 is a partial cross-sectional view of a battery case according to Example 7 of the present invention. [Figure 10] FIG. 10 is a schematic structural diagram of a battery case in Example 8 of the present application. [Figure 11] FIG. 10 is a partial cross-sectional view of a battery case according to Example 8 of the present invention. [Figure 12] FIG. 10 is a schematic structural diagram of a battery case in Example 9 of the present application. [Figure 13] FIG. 1 is an exploded view of the dissolution mechanism in Example 9 of the present application. [Figure 14] FIG. 10 is a cross-sectional view of the dissolution mechanism in Example 9 of the present application. [Figure 15] FIG. 2 is a schematic structural diagram of a battery case in Example 10 of the present application. [Figure 16] FIG. 2 is a partial cross-sectional view of a battery case according to an eleventh embodiment of the present invention. [Figure 17] FIG. 11 is a schematic structural diagram of a battery case in Example 11 of the present application. [Figure 18] FIG. 12 is a schematic structural diagram of a large-capacity battery in Example 12 of the present application. [Figure 19] FIG. 16 is a schematic structural diagram of a multi-drop liquid storage pipeline in Example 12 of the present application. [Figure 20] FIG. 2 is a schematic cross-sectional view of a battery case in Example 13 of the present application. [Figure 21] FIG. 2 is a schematic structural diagram of a battery case in Example 13 of the present application. [Figure 22] FIG. 2 is a schematic cross-sectional view of a battery case in Example 14 of the present application. [Figure 23] FIG. 2 is a schematic structural diagram of a battery case in Example 14 of the present application. [Figure 24] FIG. 1 is a schematic structural diagram of a unit cell in Example 15 of the present application. [Figure 25] FIG. 1 is a schematic structural diagram of a large-capacity battery in Example 15 of the present application. [Figure 26] FIG. 2 is a schematic exploded view of the battery case in Examples 16 to 18 of the present application. [Figure 27] FIG. 2 is a schematic view of the battery case in Examples 16 to 18 of the present application. [Figure 28] FIG. 2 is a schematic structural diagram of a large-capacity battery in Example 16 of the present application. [Figure 29] FIG. 10 is a schematic cross-sectional view of the dissolution mechanism in Example 19 of the present application. [Figure 30] FIG. 1 is a schematic structural diagram of the dissolution mechanism in Example 19 of the present application. [Figure 31] FIG. 20 is a schematic diagram showing the attachment of a dissolution mechanism and a battery case in Example 19 of the present application. [Figure 32] FIG. 10 is a schematic diagram showing how a dissolving mechanism is attached to the opening portion in Example 20 of the present application. [Figure 33] FIG. 10 is a schematic cross-sectional view of the dissolution mechanism in Example 21 of the present application. [Figure 34] FIG. 21 is a schematic diagram showing how the dissolving mechanism in Example 21 of the present application is attached to the opening portion. [Figure 35] 1 is a schematic structural diagram 1 of a soft package battery in Example 22 of the present application. [Figure 36] 2 is a schematic structural diagram 2 of the soft package battery in Example 22 of the present application. [Figure 37] FIG. 2 is a schematic structural diagram of a large-capacity battery in Example 23 of the present application. [Figure 38] FIG. 2 is a schematic cross-sectional view of a battery case in Example 24 of the present application. [Figure 39] FIG. 2 is a schematic cross-sectional view of a battery case in Example 25 of the present application. [Figure 40] FIG. 2 is a schematic diagram of the cross-sectional structure of a cell in Example 26 of the present application. [Figure 41] FIG. 10 is a schematic diagram of a cell in Example 26 of the present application placed in an outer case. [Figure 42]FIG. 10 is a schematic diagram of the connection between multiple soft package cells and an upper cover assembly in Example 27 of the present application. [Figure 43] FIG. 10 is a schematic structural diagram of a single soft package cell in Example 27 of the present application. [Figure 44] FIG. 2 is a schematic structural diagram of a plastic case battery in Example 27 of the present application. [Figure 45] FIG. 2 is a schematic structural diagram of a plastic case battery in Example 28 of the present application. [Figure 46] FIG. 2 is a schematic structural diagram of a large-capacity battery in Example 29 of the present application. [Figure 47] FIG. 29 is a schematic structural diagram of a multi-drop liquid storage pipeline in Example 29 of the present application. [Explanation of symbols]

[0062] 11...battery case, 12...case opening, 13...dissolving mechanism, 131...dissolving base layer, 132...isolation coating layer, 133...isolation assembly, 14...fixing portion, 141...receiving base, 142...through passage, 143...base, 15...large-capacity battery, 16...electrolyte chamber, 21...battery case, 22...battery positive electrode, 23...battery negative electrode, 24...case opening, 25...dissolving mechanism, 251...dissolving assembly, 252...isolation assembly, 26...fixing portion, 31...battery case, 32...battery positive electrode, 33...battery negative electrode, 34...dissolving mechanism, 35...base, 36...isolation assembly, 37...dissolving assembly, 38... Push-up assembly, 381...elastic member, 382...fixing portion, 39...case opening, 41...battery case, 42...dissolving mechanism, 421...base, 422...connecting pipe, 423...dissolving assembly, 43...mounting portion, 44...mounting hole, 441...first hole, 442...second hole, 45...seal ring, 46...gasket, 47...through hole, 48...nut, 49...receiving base, 410...pressing member, 411...multi-drop liquid storage pipe, 4110...main pipe, 4111...branch pipe, 4112...liquid storage chamber, 412...single cell, 51...case body, 52...dissolving mechanism, 521...dissolving layer, 522...isolation layer , 53...Case opening, 54...Metal ring, 55...Hot melt adhesive layer, 56...Filter membrane, 57...Ring-shaped adhesive layer, 58...Outer case, 59...Electrolyte chamber, 510...Single cell, 511...Battery positive electrode, 512...Battery negative electrode, 61...Battery case, 62...Protrusion, 621...Center through hole, 63...Dissolving mechanism, 631...Cap, 6311...Through hole, 632...Dissolving sheet, 6321...Metal plating layer, 6322...Filter membrane, 6323...Protective layer, 633...Gasket, 64...Single cell, 65...Large capacity battery case, 66...Electrolyte chamber, 67...Inlet, 71...Clamp member, 7 2...slit, 73...first clamp plate, 74...second clamp plate, 75...bolt, 76...gasket, 77...outer clip, 78...inner support, 79...battery case, 710...opening portion, 711...soft package battery, 712...positive electrode tab, 713...negative electrode tab, 714...outer case, 715...cover plate, 81...battery case, 811...body layer, 8110...inner surface, 8111...outer surface, 812...adhesive layer, 813...protective layer, 814...heat seal layer, 82...battery positive electrode, 83...battery negative electrode, 84...single cell, 85...outer case, 86...electrolyte chamber, 87...electrode assembly,91...soft package cell, 92...upper cover assembly, 93...burst relief valve, 94...positive electrode tab, 95...conductive connection sheet, 96...positive electrode column, 97...opening, 98...negative electrode column, 99...negative electrode tab, 910...battery case, 911...case opening, 912...contact pipe, 913...dissolving mechanism, 914...main pipe, 915...branch pipe, 916...plastic case battery, 917...storage chamber, 918...liquid injection gas vent section. DETAILED DESCRIPTION OF THE INVENTION

[0063] The present application will now be described in more detail with reference to the drawings so that those skilled in the art can practice the invention by reference to the text of the specification.

[0064] The battery case referred to in this application may be a battery case for a soft-packaged battery or a hard-shell battery, and its use is not limited to a single type of battery. The battery case in this application has a dissolution mechanism. In this case, the battery case may be the dissolution mechanism, or the dissolution mechanism may be provided at the case opening or at an opening portion of the battery case. When the dissolution mechanism comes into contact with the electrolyte, the entire dissolution mechanism may dissolve the electrolyte, or only a portion of the dissolution mechanism may dissolve the electrolyte. It is sufficient that the dissolution mechanism forms a path through which the electrolyte flows after contacting the electrolyte. When the battery case is provided with a dissolution mechanism, the dissolution mechanism may be provided on the top cover of the battery case, the bottom of the battery case, or the side of the battery case, any location that makes it easy to place a dissolution assembly in the electrolyte chamber of a large-capacity battery, or a location that makes it easy to connect the internal chambers of multiple single cells. When the dissolution mechanism comes into contact with the electrolyte, it penetrates the internal chamber of the battery case to the outside. Example 1 As shown in FIG. 1 , this embodiment provides a battery case, in which a battery case 11 is provided with a case opening 12 and a dissolving mechanism 13. Typically, the case opening 12 is circular. In this embodiment, the dissolving mechanism 13 is a dissolving base layer that is soluble in an electrolyte. The dissolving base layer is a circular sheet whose diameter is larger than that of the case opening 12 and that covers the case opening 12. The material of the dissolving base layer is one of polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-methyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer. In this embodiment, the thickness of the soluble base layer is 2 mm, and the soluble base layer can be adhesively fixed to the case opening 12 by adhesive, and the soluble base layer 131 has an area larger than that of the case opening 12 and covers the case opening 12, thereby sealing the case opening 12.

[0065] Experiments have confirmed that when materials such as polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer are immersed in conventional electrolytes for a certain period of time, they are gradually dissolved and disappear. The time it takes for different materials to be dissolved by the electrolyte varies, ranging from 1 to 7 days, during which time other assembly operations can be performed.

[0066] Those skilled in the art will readily appreciate that the dissolution base layer may be made of one or more layers of material, and may be made by pressing or stacking two or more of the materials listed in this example, and that the dissolution rate and dissolution time of dissolution base layers made of a combination of different materials in the electrolyte will be different.

[0067] As shown in Figure 7, when multiple single cells having the above-mentioned battery case 11 are placed in the electrolyte chamber 16 of the large-capacity battery 15, the electrolyte chamber 16 is filled with electrolyte, so the case opening 12 is immersed in the electrolyte, and the dissolving base layer gradually disappears as it dissolves in the electrolyte. Therefore, the case opening 12 is opened, the inside and outside of the battery case 11 are penetrated, and the electrolyte flows into the single cells through the case opening 12, thereby realizing communication between the electrolyte chamber inside the single cells and the electrolyte chamber of the large-capacity battery 15.

[0068] In actual use, after a certain period of use, differences will occur due to different consumption of electrolyte among the individual cells, resulting in differences in the performance of the individual cells and poor consistency among the individual cells. Therefore, when a number of cells with the same case are placed in the electrolyte chamber 16 of the large-capacity battery 15 and the electrolyte chamber 16 is filled with electrolyte, the dissolving base layer 131 of the case opening 12 dissolves in the electrolyte, and the electrolyte of the large-capacity battery flows into the battery, establishing communication between the electrolyte of all the individual cells and the electrolyte chamber of the large-capacity battery. This results in a uniform electrolyte among all the individual cells, reducing the differences among the cells and thereby improving the consistency and stability of the batteries and their performance. Example 2 As shown in FIG. 2, this embodiment provides a battery case, in which the battery case 11 is provided with a case opening 12 and a dissolving mechanism 13, the case opening 12 is generally circular, and the dissolving mechanism 13 includes a dissolving base layer 131 and an isolation layer. In this embodiment, the dissolving base layer 131 is a circular sheet having a thickness of 2 mm and a diameter larger than that of the case opening 12, and is covered by the case opening 12. The material of the dissolving base layer 131 can be the material provided in Example 1.

[0069] In this embodiment, the isolation layer is an isolation coating layer 132 applied to the inner surface of the dissolving base layer 131, the inner surface of the dissolving base layer 131 being the surface facing the case interior, and the isolation coating layer 132 is completely covered by the inner surface of the dissolving base layer 131. The isolation coating layer 132 includes an adhesive and a solvent, the adhesive being at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose, and polyvinyl alcohol, and the solvent being at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylformamide, dimethyl sulfoxy, tetrahydrofuran, and water or alcohols.

[0070] In this embodiment, the isolation coating layer 132 is manufactured as follows: 10 g of adhesive is added to 90 g of solvent and stirred uniformly to form a mobile phase coating. The coating is then uniformly sprayed onto the inner surface of the dissolving base layer 131, which faces the housing interior. Because the selected adhesive is insoluble in the electrolyte, the isolation coating layer 132 formed is also insoluble in the electrolyte. An isolation layer that is insoluble in the electrolyte is formed on the inner surface of the dissolving base layer 131, covering the housing opening 12. Because the isolation coating layer 132 contains adhesive, the dissolving base layer 131 can be attached to the housing opening 12. Furthermore, because the area of ​​the dissolving base layer 131 is larger than the area of ​​the housing opening 12, the dissolving mechanism 13 can seal the housing opening 12.

[0071] The manufacturing method of the isolation coating layer 132 in this embodiment is merely illustrative, and the mass of the adhesive and solvent therein is not limited to the masses listed in this embodiment, but can be adjusted according to the size of the case opening 12 and the dissolving base layer 131.

[0072] In another embodiment, the isolation layer is a film that is insoluble in the electrolyte, such as a polyethylene film or a polypropylene film, and the thickness of the film is 0.1 mm. The isolation layer is covered by the inner surface of the dissolving base layer 131, the inner surface of which is the surface of the dissolving base layer 131 facing the inner chamber of the case. The dissolving mechanism 13 covered by the isolation layer is fixed to the case opening 12 by adhesive, and since the area of ​​the dissolving base layer 131 is larger than the area of ​​the case opening 12, the dissolving mechanism 13 seals the case opening 12.

[0073] As shown in FIG. 7, a plurality of single cells having the above-mentioned battery case are placed in the electrolyte chamber 16 of the large-capacity battery 15, and the electrolyte chamber 16 is a shared electrolyte chamber. The electrolyte chamber 16 is filled with an electrolyte, and the case opening 12 is immersed in the electrolyte. In this embodiment, the inner surface of the dissolving base layer 131 has an isolation coating layer 132 or a film that is not dissolved in the electrolyte. Therefore, the dissolving base layer 131 is not dissolved by the electrolyte inside the single cells, and the dissolving base layer 131 is dissolved only by the electrolyte outside the single cells. That is, the electrolyte in the electrolyte chamber 16 of the large-capacity battery 15 dissolves and gradually disappears, and after the dissolving base layer 131 is dissolved, the isolation coating layer 132 applied to the inner surface of the dissolving base layer 131 loses its adhesive carrier, and the case opening 12 is no longer sealed. Under the fluid action of the electrolyte, the case opening 12 is opened, the inside and outside of the cell case 11 are penetrated, and the electrolyte flows into the cell through the case opening 12, thereby realizing communication between the electrolyte chamber inside the cell and the electrolyte chamber of the large-capacity battery 15. Example 3 As shown in Figures 3 and 5, this embodiment provides a battery case. The battery case 11 is provided with a case opening 12, a dissolving mechanism 13, and a fixing part 14. The case opening 12 is generally circular. The dissolving mechanism 13 is the dissolving mechanism having only a dissolving base layer as in Example 1, or the dissolving mechanism having an insulating layer coated on the inner surface of the dissolving base layer as in Example 2. The material of the dissolving base layer 131 is made of one or more of the materials for the dissolving base layer 131 listed in Examples 1 and 2. The fixing part 14 is provided on the outside of the case opening 12. The fixing part 14 is provided with a base 143, a through-passage 142, and a receiving platform 141 within the through-passage 142. The through-passage 142 is a cylindrical passage that penetrates the case opening 12 and has a diameter greater than or equal to that of the case opening 12. The dissolving mechanism 13 is fixedly placed on the receiving platform 141, and may be fixed by adhesive. The through-passage 142 is sealed by the dissolving mechanism 13. Therefore, the case opening 12 is sealed by the dissolving mechanism 13. The material of the fixing part 14 is a plastic that is not dissolved in metal or electrolyte, and the fixing part 14 can be fixed to the case by adhesive or welding. Example 4 As shown in FIG. 4 , this embodiment provides a battery case. The battery case 11 has a case opening 12 and a dissolving mechanism 13. The dissolving mechanism 13 includes a dissolving base layer 131 and an isolation assembly 133. The case opening 12 is typically a circular opening. In this embodiment, the isolation assembly 133 is a sphere with a diameter larger than the case opening 12 and is made of a material that is insoluble in the electrolyte, such as glass or plastic. The dissolving base layer 131 is a 2 mm thick, open-ended cylindrical structure that surrounds the isolation assembly 133 and presses it against the case opening 12 to seal the case opening 12. The dissolving mechanism 13 is fixed to the case opening 12 by adhesive or other means. The material of the dissolving base layer 131 in this embodiment may be the same as that of the dissolving base layer in Example 1. Experiments have confirmed that the above material can be dissolved by the electrolyte.

[0074] As shown in Figure 7, a number of single cells having the battery case of this embodiment are placed in the electrolyte chamber 16 of the large-capacity battery 15. The electrolyte chamber 16 is filled with electrolyte, so that the case opening 12 is immersed in the electrolyte, and the dissolving base layer 131 gradually disappears as it dissolves in the electrolyte. In this case, the dissolving base layer 131 no longer presses against the isolation assembly 133, and the isolation assembly 133 moves away from the case opening 12. The case opening 12 is opened, so that the inside and outside of the single cells are connected, and the electrolyte flows into the single cells through the case opening 12, thereby realizing communication between the electrolyte chamber inside the single cells and the electrolyte chamber of the large-capacity battery. Example 5 As shown in Figures 5 and 6, this embodiment provides a battery case, where the battery case 11 has a case opening 12, a fixing part 14, and a dissolving mechanism 13, and the dissolving mechanism 13 includes a dissolving base layer 131 and an isolation assembly 133, the fixing part 14 is a tubular structure fixedly attached to the outside of the case opening 12, is made of metal or plastic that is insoluble in the electrolyte, and is fixed by adhesive or welding, and includes a through-passage 142 that connects the interior of the battery case to the exterior of the battery case, the dissolving base layer 131 is a circular sheet with a thickness of 2 mm and a diameter larger than that of the case opening 12, and the isolation assembly 133 is a sphere with a diameter larger than that of the case opening 12, and may be made of a material that is insoluble in the electrolyte, such as glass or plastic. The soluble base layer 131 is attached to the fixing portion 14 by adhesive or screw connection or the like, and presses against the isolation assembly 133 to seal the through passage 142, thereby isolating the inside and outside of the battery.

[0075] As shown in FIG. 7, a number of cells having the battery case of this embodiment are placed in the electrolyte chamber 16 of the large-capacity battery 15. The electrolyte chamber 16 is filled with electrolyte, so that the case opening 12 is immersed in the electrolyte, and the dissolving base layer 131 gradually disappears as it dissolves in the electrolyte. After the dissolving base layer 131 disappears, the isolation assembly 133 is no longer pressed, and the through-passage 142 is no longer sealed. The case opening 12 is opened, connecting the inside and outside of the battery case 11, and the electrolyte flows into the cells through the case opening 12, thereby realizing communication between the electrolyte chamber inside the cells and the electrolyte chamber of the large-capacity battery. Example 6 This embodiment provides a battery case as a dissolution mechanism. The battery case is made of at least one of the following materials: polypropylene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer. Since the dissolution rates of these different materials in the electrolyte are different, the case material may be made of a single material or a multi-layer case made of two or more materials to meet the time requirement for the case to be dissolved by the electrolyte.

[0076] A number of cells with the battery cases of this embodiment are placed in the electrolyte chamber of the large-capacity battery. As the electrolyte chamber is filled with electrolyte, the battery cases are gradually dissolved and disappear due to the electrolyte. As the electrodes in the battery cases are in the common electrolyte chamber of the large-capacity battery, all of the cells are in a uniform electrolyte environment, reducing or eliminating the differences in battery performance caused by different electrolyte consumption during operation. Furthermore, after dissolution, the case material also acts as an electrolyte additive, removing moisture from the electrolyte and extending the service life of the batteries. Example 7 As shown in Figures 8 and 9, this embodiment provides a battery case, in which the battery case 21 has a case opening 24, and the dissolving mechanism 25 includes a dissolving assembly 251 and an isolation assembly 252. The isolation assembly 252 is a polypropylene film or polyethylene film with a thickness of 0.1 mm, and the dissolving assembly 251 is a polymethyl methacrylate sheet with a thickness of 2 mm. The polypropylene film completely covers the case opening 24, and the polypropylene film is attached to the surface of the dissolving assembly 251 close to the case opening 24. The areas of the polypropylene film and the polymethyl methacrylate sheet are both larger than the area of ​​the case opening 24, so that the dissolving mechanism 25 can cover the case opening 24 to isolate the electrolyte inside the battery chamber from contact with the outside. A fixing part 26 is provided outside the case opening 24 to restrict movement of the dissolving mechanism 25 along the thickness direction, thereby sealing the case opening 24 with the polymethyl methacrylate sheet covered by the polypropylene film.

[0077] During operation, the battery positive electrode 22 and battery negative electrode 23 of the single cell are each current draw terminals, and the single cells of multiple battery cases 21 are placed in the electrolyte chamber of the large-capacity battery. The polymethyl methacrylate sheet in the case opening 24 gradually dissolves and disappears due to contact with the external electrolyte, and under the fluid action of the electrolyte, the polypropylene film falls off from the case opening 24, connecting the case opening 24 to the outside. The electrolyte in the electrolyte chamber of the large-capacity battery flows into the interior of the battery chamber through the case opening 24, thereby connecting the electrolyte chamber inside the battery to the electrolyte chamber of the large-capacity battery. Example 8 As shown in Figures 10 and 11, in this embodiment, a battery case 21 has a circular case opening 24, an isolation assembly 252 is a sphere, a fixing part 26 is located outside the opening, the sphere is located inside the fixing part 26, and there is a gap between the fixing part 26 and the sphere, the dissolving assembly 251 is a polymethylmethacrylate sheet with a thickness of 3 mm, the diameter of the sphere is larger than the diameter of the case opening 24, the polymethylmethacrylate can cover the case opening 24, and the polymethylmethacrylate presses the sphere, causing the sphere to seal the case opening 24, the polymethylmethacrylate sheet and the fixing part 26 are fixed by screws or fasteners, and the material of the sphere can be glass or metal.

[0078] During operation, a number of single cells having the above-mentioned battery cases are placed in the electrolyte chamber of the large-capacity battery, and the polymethylmethacrylate sheet gradually dissolves and disappears due to contact with the external electrolyte. The spheres are not pressed down by the polymethylmethacrylate sheet, and since there is a certain gap between the fixing part 26 and the polymethylmethacrylate sheet, the spheres move, and part or all of the case opening 24 communicates with the outside. The electrolyte in the electrolyte chamber of the large-capacity battery flows into the inside of the battery chamber through the case opening 24, thereby connecting the electrolyte chamber inside the battery with the electrolyte chamber of the large-capacity battery. Example 9 As shown in FIGS. 12 to 14, this embodiment provides a battery case, in which a battery case 31 is provided with a case opening 39, and a dissolving mechanism 34 is provided in the case opening 39, and the dissolving mechanism 34 includes an isolation assembly 36, a dissolving assembly 37, a push-up assembly 38, and a base 35 having a central hole, and the push-up assembly 38 includes an elastic member 381 and a fixing portion 382, ​​and the isolation assembly 36 is a polypropylene film having a thickness of 0.1 mm, and the dissolving assembly 37 is a polymethyl methacrylate sheet having a thickness of 2 mm, and the polypropylene film is 382。 In this embodiment, the elastic member 381 is a spring, and the fixing part 382 has a central hole and a male thread that engages with the base 35. The fixing part 382 is connected to the base 35 via the screw, so that the spring is compressed, and the case opening 39 is sealed by the polymethylmethacrylate sheet covered with polypropylene film.

[0079] The positive and negative electrodes 32 and 33 of each cell are current-drawing terminals, and the cell case is the battery case 31 in this embodiment. When the cell is in its natural state and not in contact with external electrolyte, the isolation assembly 36 is made of polypropylene film, which is insoluble in electrolyte, sealing the interior of the battery case 31 from the outside. When multiple cells with this dissolving mechanism 34 are placed in the electrolyte compartment of a large-capacity battery, the polymethylmethacrylate sheet gradually dissolves upon contact with external electrolyte, and the spring is no longer pressed by the polymethylmethacrylate sheet. Under the elastic action of the spring, the polypropylene film is pushed up, and the case opening 39 is no longer sealed. The external electrolyte can enter the battery compartment through the central hole of the fixing part 382, ​​the central hole of the base 35, and the opening of the battery case 31, so that the electrolyte compartment of each cell is in the same system as the electrolyte compartment of the large-capacity battery.

[0080] The spring in this embodiment may be another elastic member, such as an expandable barb-like member, which has the same effect. In this embodiment, the base 35 is not provided, and the fixed part 382 may be directly bonded or welded to the case opening 39, and the pressing elastic member 381 is pressed by the fixed part 382. The connection method between the base 35 and the fixed part 382 in this embodiment may be another connection method, such as a fastening method. Example 10 As shown in FIG. 15, this embodiment provides a battery case, and the battery case 41 is provided with a dissolving mechanism 42, and the dissolving mechanism 42 includes a base 421, a connecting pipe 422 protruding from the base 421, and a dissolving assembly 423. The battery case 41 has a mounting hole 44, and the side wall of the case where the mounting hole 44 is located is a mounting part 43. The base 421 has a through-hole 47, and the through-hole 47 and the connecting pipe 422 penetrate each other. The connecting pipe 422 passes through the mounting hole 44 from the inside to the outside of the battery case. The base 421 is tightly attached to the mounting part 43 by an adhesive method. A melting assembly 423 is sealably attached within the connecting tube 422. In this embodiment, the melting assembly 423 is a polymethylmethacrylate sheet covered on one side with polypropylene film. The polymethylmethacrylate sheet is 2 mm thick, and the polypropylene film is 0.1 mm thick. The polypropylene film covers the entire surface facing the inside of the polymethacrylate case. The melting assembly 423 is sealably attached to the connecting tube 422, and the connecting tube 422 and the inside of the case form a sealed cavity.

[0081] When the battery case 41 is in its natural state, the inside of the battery case 41 is sealed and isolated from the outside. When the battery case 41 is placed in an external electrolyte or when electrolyte is injected into the connecting tube 422 of the dissolving mechanism 42, the electrolyte comes into contact with the polymethyl methacrylate sheet, and the polymethyl methacrylate sheet is dissolved in the electrolyte and gradually disappears. After the polymethyl methacrylate disappears, under the action of the fluid, the polypropylene film moves and no longer seals the connecting tube 422, connecting the inside and outside of the battery case 41, and the electrolyte flows into the battery case 41 through the connecting tube 422. Example 11 As shown in FIGS. 16 and 17, this embodiment provides a battery case, and the battery case 41 is provided with a dissolving mechanism 42. The dissolving mechanism 42 includes a base 421, a connecting pipe 422 protruding from the base 421, and a dissolving assembly 423. The base 421 has a through hole 47, which penetrates the connecting pipe 422. The case has a mounting hole 44. The side wall of the case where the mounting hole 44 is located is a mounting portion 43. The mounting hole 44 is a stepped hole. The mounting hole 44 is a first hole 441 and a second hole 442 from the inside to the outside of the case. The diameter of the first hole 441 is larger than the diameter of the second hole 442, the connecting pipe 422 passes through the mounting hole 44 from the inside of the case to the outside, the base 421 is drilled into the first hole 441, the connecting pipe 422 is drilled into the second hole 442, the connecting pipe 422 is provided with an external thread, and the portion with the external thread is located outside the battery case, the melting mechanism 42 further includes a nut 48, and the nut 48 is provided with an internal thread that matches the external thread of the connecting pipe 422, the connecting pipe 422 and the nut 48 are tightly connected via the thread, and the melting mechanism 42 is fixed to the battery case. In this embodiment, the melting assembly 423 is a polymethylmethacrylate sheet covered on one side with a polypropylene film, the polymethylmethacrylate sheet being 2 mm thick and the polypropylene film being 0.1 mm thick, and the polypropylene film is completely covered on the side facing the inside of the polymethacrylate case. A support 49 is provided inside the connecting tube 422, the melting assembly 423 is placed on the support 49 and seals the through-hole 47, and the melting assembly 423 further includes a hollow pressing member 410 which presses and fixes the melting assembly 423 to the support 49 and is sealed to the connecting tube 422. The connection method can be threaded, fastened, or adhesive, etc., and the cavity formed inside the case is sealed and isolated from the outside of the battery case 41.

[0082] When the battery case 41 is in its natural state, the inside of the battery case 41 is sealed and isolated from the outside. When the battery case 41 is placed in an external electrolyte or when electrolyte is injected into the connecting tube 422 of the dissolving mechanism 42, the electrolyte comes into contact with the polymethacrylate sheet through the connecting tube 422, and the polymethacrylate is gradually dissolved and disappears by the electrolyte. Under the action of the fluid, the polypropylene film moves, the connecting tube 422 is no longer sealed, the inside and outside of the battery case 41 are penetrated, and the electrolyte flows into the battery case 41 through the connecting tube 422.

[0083] In another embodiment, the fusing system 42 further includes a gasket 46, which is disposed between the base 421 and the mounting portion 43 and can seal the connection between the nut 48 and the case. In another embodiment, the fusing system 42 further includes a seal ring 45, which is disposed between the base 421 and the mounting portion 43 and can seal the connection between the base 421 and the case. Example 12 As shown in FIGS. 18 and 19, this embodiment provides a large-capacity battery including a plurality of parallel-connected cells 412 and a multi-drop liquid storage conduit 411. The case of the cells 412 is the battery case 41 in embodiment 10 or 11. The multi-drop liquid storage conduit 411 includes a main conduit 4110 and a plurality of branch pipes 4111. The inner chamber of the main conduit 4110 is a storage chamber 4112 for storing electrolyte. The branch pipes 4111 and the connecting pipes 422 of the cells 412 are connected in a one-to-one correspondence. A dissolving assembly 423 is provided in the connecting pipe 422. Therefore, when the electrolyte is injected into the multi-drop liquid storage conduit 411, the electrolyte The liquid enters each cell 412 through the main pipe 4110 and the branch pipe 4111. The connecting pipe 422 of each cell 412 has a dissolving assembly 423. The dissolving sheet in the dissolving assembly 423 is dissolved by the electrolyte and gradually disappears. Under the fluid action of the electrolyte, the protective film no longer seals the connecting pipe 422, and the electrolyte flows into the cells 412 and then into each battery. The electrolyte is contained in the reservoir 4112. Since the cells 412 and the reservoir 4112 are both in a common electrolyte system, the performance differences caused by different electrolyte consumption in each battery are reduced, and the large-capacity batteries have good uniformity. Example 13 As shown in Figures 20 and 21, this embodiment provides a battery case including a case body 51 and a dissolving mechanism 52. The case body 51 has a case opening 53, and the dissolving mechanism 52 is disposed on the outer surface of the case body 51 and is covered by the case opening 53. The dissolving mechanism 52 includes a dissolving layer 52 and an isolating layer 522. In this embodiment, the thickness of the dissolving layer 521 is 1.5 mm and the material is one of polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA). The isolating layer 522 is a metal-plated layer on the inner surface of the dissolving layer 521, which is the surface of the dissolving layer 521 facing the interior of the battery case.

[0084] In this embodiment, a metal ring 54 is provided between the dissolving mechanism 52 and the case body 51, and a hot melt adhesive layer 55 is provided between the metal ring 54, the case body 51, and the dissolving mechanism 52. The hot melt adhesive layer 55 is applied in a ring shape with the same inner and outer diameters as the metal ring 54. The hot melt adhesive layer 55 is made of a modified polypropylene film. Since modified polypropylene does not dissolve in the electrolyte, the projection of the ring inner area CC of the metal ring 54 must cover the area AA of the case opening 53 to ensure that the case opening 53 and the inner chamber of the battery are connected after the dissolving layer 521 of the dissolving mechanism 52 dissolves. The hot melt adhesive layer 55 is located at the contact surface between the metal ring 54, the dissolving mechanism 52, and the case body 51, and does not block the case opening 53.

[0085] The metal ring 54 is used as follows: The metal ring 54 is placed on the outer surface of the case opening 53, between the case body 51 and the melting mechanism 52, with the projection of the inner ring area CC of the metal ring 54 covering the area AA of the case opening 53. An electromagnetic induction device is placed on the melting layer 521. The electromagnetic induction device is activated to conduct electromagnetic induction to the metal ring 54, which instantly generates heat and melts the modified polypropylene with the heat. After melting, the modified polypropylene bonds and fixes the metal ring 54 to the case body 51 and the melting mechanism 52, thereby fixing the melting mechanism 52 to the case body 51.

[0086] The metal plating layer is a commonly used aluminum plating layer or copper plating layer, which is formed on the surface of the dissolvable layer 521 using a vacuum deposition process. The thickness of the metal plating layer is 200 Å to 800 Å. The aluminum plating layer or copper plating isolation layer 522 is insoluble in the electrolyte and has good brittleness. After the dissolvable layer 521 dissolves, the metal plating layer is very easy to break, so it can serve as an excellent isolation layer 522 and can provide air and light blocking effects. Experiments have confirmed that these materials, including polystyrene (PS), polymethyl acrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA), are gradually dissolved and disappear by the electrolyte after being immersed in conventional electrolyte for a certain period of time. Since different materials have different dissolution times in the electrolyte, different materials can be selected for the dissolving layer 521 according to the actual needs of use. The thicker the dissolving layer 521, the longer the dissolving time required. Experimental results show that the thickness of the dissolving layer 521 is preferably less than 2 mm, which is easy to fix and has an appropriate dissolving time.

[0087] As shown in FIG. 25 , a plurality of cells 510 having the above-mentioned battery cases are placed in an electrolyte chamber 59 of a large-capacity battery. Since the electrolyte chamber 59 is filled with electrolyte, the case opening 53 is immersed in the electrolyte. Because the dissolvable layer 521 has a metal plating layer on the inner surface, the dissolvable layer 521 is not dissolved by the electrolyte inside the cell 510. Instead, the dissolvable layer 521 is gradually dissolved only by the electrolyte outside the cell 510, i.e., the electrolyte inside the electrolyte chamber 59. After the dissolvable layer 521 is dissolved by the electrolyte, the metal plating layer on the surface of the dissolvable layer 521 is only 200 angstroms to 800 angstroms thick. The dissolvable layer 521 loses its support and bursts, thereby opening the case opening 53. Under the fluid action of the electrolyte, the electrolyte inside the electrolyte chamber 59 flows into the battery case of the cell 510, realizing penetration of the electrolyte between the inside and outside of the cell 510.

[0088] In actual use, after a certain period of use, differences will occur due to different consumption of electrolyte among the cells 510, which will result in differences in the performance of the cells 510 and differences in the consistency of the batteries. A plurality of cells 510 with the battery case are placed in the electrolyte chamber 59 of the large-capacity battery, and the electrolyte chamber 59 is filled with electrolyte. When the dissolvable layer 521 of the case opening 53 dissolves, the electrolyte of the large-capacity battery flows into the battery, establishing communication between the electrolyte chambers of all the cells 510 and the electrolyte chamber of the large-capacity battery. The electrolyte of all the cells 510 is in a consistent state, reducing the differences between the batteries, thereby improving the consistency and stability of each cell 510 and improving the performance of the battery. Example 14 22 and 23 , this embodiment provides a battery case including a case body 51 and a dissolving mechanism 52, where the case body 51 has a case opening 53, the dissolving mechanism 52 is disposed on the outer surface of the case body 51, and is covered by the case opening 53, and the dissolving mechanism 52 includes a dissolving layer 521 and an isolating layer 522. In this embodiment, the thickness of the dissolving layer 521 is 2 mm and is made of one of polystyrene (PS), polymethyl acrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA), and the isolating layer 522 is a metal plating layer on the inner surface of the dissolving layer 521, which is the surface of the dissolving layer 521 facing the inner chamber of the battery case. A filter membrane 56 is disposed between the case body 51 and the dissolving mechanism 52. Ring-shaped adhesive layers 57 are disposed on the upper and lower surfaces of the filter membrane 56. That is, the ring-shaped adhesive layers 57 are located at the contact surfaces between the filter membrane 56, the case body 51, and the dissolving mechanism 52. The ring-shaped adhesive layers 57 are made of one of epoxy resin adhesive, modified polypropylene / polyethylene, and tab adhesive. The ring-shaped adhesive layer 57 is insoluble in the electrolyte. After the dissolving layer 521 is dissolved by the electrolyte, the projection of the ring-shaped adhesive layer 57 on the ring inner area DD covers the area AA of the case opening 53, ensuring that the electrolyte can flow into the case opening 53 through the filter membrane 56. Therefore, the ring-shaped adhesive layer 57 does not block the case opening 53.

[0089] In this embodiment, the material of the filter membrane 56 is one of polytetrafluoroethylene, modified polypropylene, modified polyethylene, or filter paper, and the filter membrane 56 may be provided in a single layer or in multiple layers. When the filter membrane 56 is provided in multiple layers, the filter membranes 56 may be fixed to each other by adhesive or welding.

[0090] In this embodiment, the metal plating layer on the surface of the dissolvable layer 521 may be an aluminum plating layer or a copper plating layer, or may be nickel or zinc plating. The plating layer may be formed on the surface of the dissolvable layer 521 using a vacuum deposition process, or may be formed using a plating process such as electroplating, electroless plating, or electroless electroplating. The thickness of the metal plating layer is 200 angstroms to 800 angstroms, where "angstrom" is a unit of length, and 10 "angstroms" is equal to 1 nanometer. Those skilled in the art will readily appreciate that, in addition to using adhesive to secure the filter membrane 56 between the case body 51 and the dissolvable mechanism 52, welding processes such as ultrasonic welding, vibration welding, and heat welding may also be used.

[0091] As shown in FIG. 25 , a plurality of cells 510 having the above-mentioned battery cases are placed in an electrolyte chamber 59 of a large-capacity battery. Since the electrolyte chamber 59 is filled with electrolyte, the case opening 53 is immersed in the electrolyte. Because the dissolvable layer 521 has a metal plating layer on the inner surface, the dissolvable layer 521 is not dissolved by the electrolyte inside the cell 510. Instead, the dissolvable layer 521 is gradually dissolved only by the electrolyte outside the cell 510, i.e., the electrolyte inside the electrolyte chamber 59. After the dissolvable layer 521 is dissolved by the electrolyte, the metal plating layer on the surface of the dissolvable layer 521 is only 200 angstroms to 800 angstroms thick. The dissolvable layer 521 loses its support and bursts, thereby opening the case opening 53. Under the fluid action of the electrolyte, the electrolyte flows into the case of the cell 510, realizing penetration between the inside and outside of the cell 510. Example 15 24 , this example provides a cell, and the battery case of the cell 510 is the battery case of Example 13 or Example 14, an electrode assembly and an electrolyte are housed in the battery case, a battery positive electrode 511 and a battery negative electrode 512 are current draw terminals of the cell 510, a case opening 53 is provided on the bottom of the battery case, and a dissolving mechanism 52 is provided in the case opening 53. To meet usage requirements, the case opening 53 may be provided at any position on the battery case, such as on the top, side, or bottom of the case, and one or more case openings 53 may be provided in the battery case, and the dissolving mechanism 52 may be provided in only one case opening 53, or in multiple case openings 53.

[0092] As shown in FIG. 25 , this embodiment further provides a large-capacity battery including an outer case 58 and a plurality of the above-mentioned cells 510, in which an electrolyte chamber 59 is provided in the outer case 58, the electrolyte chamber 59 is filled with an electrolyte, a plurality of cells 510 are placed in the electrolyte chamber 59, a case opening 53 is provided in the battery case of the cells 510, a dissolving mechanism 52 is provided in the case opening 53, the case opening 53 is immersed in the electrolyte, and a metal plating layer is provided on the inner surface of a dissolving layer 521, the dissolving layer 521 dissolves in the electrolyte inside the cells 510, Instead, the dissolvable layer 521 is dissolved only by the electrolyte outside the cell 510, i.e., the electrolyte in the electrolyte chamber 59. After the dissolvable layer 521 is dissolved by the electrolyte, the thickness of the metal plating layer on the surface of the dissolvable layer 521 is only 200 angstroms to 800 angstroms. The dissolvable layer 521 loses its support and bursts, thereby opening the case opening 53. Under the fluid action of the electrolyte, the electrolyte flows into the case of the cell 510, and the electrolyte inside and outside the cell 510 is connected. Example 16 As shown in Figures 26 and 27, this embodiment provides a battery case, which has a protrusion 62 facing the outside of the battery on the battery case 61, and the protrusion 62 has a central through-hole 621 that connects the inner chamber of the battery to the outside of the battery. The protrusion 62 is provided with a dissolving mechanism 63, and the dissolving mechanism 63 is provided with a cap 631 and a dissolving sheet 632. The cap 631 has a through-hole 6311 that corresponds to the central through-hole 621. The dissolving sheet 632 is provided between the cap 631 and the protrusion 62, and the dissolving sheet 632 is large enough to cover the central through-hole 621. The cap 631 fixes the dissolving sheet 632 to the protrusion 62, so that the dissolving mechanism 63 can seal the central through-hole 621 of the protrusion 62. The dissolvable sheet 632 can be made from a material that dissolves in the electrolyte, preferably a material that dissolves well in the electrolyte and does not contaminate the electrolyte. Experiments have shown that polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate copolymer (SMMA), and engineering plastic (ASA) dissolve well in the electrolyte and do not contaminate the electrolyte. PMMA is a preferred material because it can improve battery performance as an electrolyte additive after dissolving in the electrolyte. The thickness of the dissolvable sheet 632 is also a relatively important parameter. The thicker the dissolvable sheet 632, the longer it takes to dissolve in the electrolyte. To ensure that the dissolvable sheet 632's dissolution time after immersing each cell 64 in the electrolyte meets the design requirements, the thickness of the dissolvable sheet 632 is preferably less than 2 mm.

[0093] As shown in FIG. 28 , in the process of manufacturing a large-capacity battery, cells 64 having the above-mentioned battery case 61 are placed in a large-capacity battery case 65 containing an electrolyte, and the electrolyte is injected into the large-capacity battery case 65 through a liquid inlet 67, filling the electrolyte chamber 66 of the large-capacity battery with the electrolyte. The electrolyte passes through the through-hole 6311 of the cap 631 and comes into contact with the dissolvable sheet 632, which is gradually dissolved by the electrolyte. After the dissolvable sheet 632 is partially or completely dissolved, the through-hole 6311 and the central through-hole 621 are penetrated, and the electrolyte in the large-capacity battery case 65 and the electrolyte in the inner chamber of each cell 64 merge with each other, thereby achieving the purpose of ensuring that the electrolyte in each cell 64 is in the same electrolyte system.

[0094] In this embodiment, the cap 631 is made of flexible aluminum metal and is fixed to the protrusion 62 by riveting, and the central through-hole 621 is sealed by the soluble sheet 632, which has a good sealing effect and is easy to operate. In some other embodiments, the protrusion 62 has an outer rim, a male thread is formed on the outer rim, and the cap 631 has an internal thread matching the male thread, and the cap 631 and the protrusion 62 are connected and fixed by screws, and the central through-hole 621 is sealed by the soluble sheet 632, which has a good sealing effect but requires additional threading on the protrusion 62 and the cap 631, making the structure more complicated than the riveting method. Example 17 As shown in FIG. 26, in order to prevent the dissolving sheet 632 from being dissolved by the electrolyte inside the battery 64, a metal plating layer 6321 that is insoluble in the electrolyte is plated on the surface of the dissolving sheet 632 facing the interior of the battery 64. The metal plating layer 6321 is an aluminum plating layer, a copper plating layer, or a nickel plating layer. The metal plating layer 6321 has good inertness and can protect the dissolving sheet 632 from being dissolved by the electrolyte inside the battery, which is a difference from Example 16. The thickness of the metal plating layer 6321 is 20 nm to 80 nm. If the metal plating layer 6321 is too thin, it will easily rupture during plating. If the metal plating layer 6321 is too thick, it will be difficult for the metal plating layer 6321 to rupture after the dissolving sheet 632 is dissolved, and the purpose of preventing the electrolyte outside the battery from reaching the inside of the battery will not be achieved. Experiments have confirmed that when the thickness of the metal plating layer 6321 is 20 nm to 80 nm, it can effectively serve as an isolating layer to isolate the electrolyte inside the battery from contact with the dissolving sheet 632. Furthermore, when the dissolving sheet 632 is dissolved by the electrolyte, the metal plating layer 6321 ruptures, causing the electrolyte in the large-capacity battery case 65 and the electrolyte in the inner chamber of each battery 64 to fuse together, thereby achieving the purpose of making the electrolyte inside each battery 64 into a uniform electrolyte system.

[0095] Furthermore, in this embodiment, the cap 631 is made of a flexible rubber material, and in use, the cap 631 tightly encases the protrusion 62 by its own elasticity, and further sealably fixes the dissolving sheet 632 to the protrusion 62. Example 18 26 , this example differs from Example 17 in that it adds protective layer 6323 to protect metal plating layer 6321. Metal plating layer 6321 has a thickness of only 20 nm to 80 nm and is highly brittle, making it prone to rupture during manufacture and use. Once metal plating layer 6321 ruptures, dissolving sheet 632 dissolves when it comes into contact with the electrolyte inside cell 64, and dissolving sheet 632 loses its ability to seal central through-hole 621. Therefore, in order to prevent the metal plating layer 6321 from bursting when the dissolvable sheet 632 is not dissolved and losing its function of isolating the dissolvable sheet 632 from the electrolyte in the battery chamber, in this embodiment, a protective layer 6323 can be applied to the surface of the metal plating layer 6321. The protective layer 6323 is made by mixing a two-component epoxy resin, adding a diluent to reduce the viscosity, and then blade coating it. It can also be made by mixing one or more of polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose, polyvinyl alcohol, etc. with a solvent (e.g., N-methylpyrrolidone, tetrahydrofuran, alcohols) to form a paste and applying it. The protective layer 6323 serves to protect the metal plating layer 6321 to prevent it from accidentally bursting during manufacture or use. When the dissolvable sheet 632 is dissolved by the external electrolyte, the metal plating layer 6321 and the protective layer 6323 lose their carrier and burst, causing the central through-hole 621 to no longer be sealed, allowing the through-hole 6311 and the central through-hole 621 to penetrate, allowing the electrolyte in the large-capacity battery case 65 to flow into the interior of the single cell 64, thereby achieving the purpose of making the electrolyte in each single cell 64 the same electrolyte system.The thickness of protective layer 6323 is preferably 0.1 μm to 10 μm. If protective layer 6323 is too thin, it will not be able to protect metal plating layer 6321. If protective layer 6323 is too thick, it will not burst when metal plating layer 6321 bursts, and will prevent electrolyte from outside the battery from entering the battery. Multiple experiments have confirmed that when protective layer 6323 has a thickness of 0.1 μm to 10 μm, it can not only protect the plating layer but also burst when metal plating layer 6321 bursts.

[0096] In this embodiment, the protective layer 6323 is manufactured as follows.

[0097] A commercially available epoxy resin (HASUNCAST brand), model number 129 (A / B), was purchased. This epoxy resin is a two-component A / B gel epoxy resin. Component A is an epoxy resin containing epoxy groups, and component B is a curing agent. Mixing components A and B alone results in a high viscosity, which is unfavorable for forming a protective film of the required thickness. Therefore, a diluent must be added. The diluent is an epoxy resin monomer.

[0098] Preparation method: Mix pre-mixed gel A with component A at a mass ratio of 100:12 until there is no sediment in the gel. Add 20g of diluent (model number: 669, manufacturer: Changzhou Runxiang Chemical Co., Ltd.) and stir for 3-5 minutes until the mixed components A, B, and diluent are homogenized. Then, add the mixture dropwise to the surface of the aluminum-plated polymethyl methacrylate and use a wire bar to evenly blade coat the surface of the metal plating layer 6321. Allow to stand and harden.

[0099] In some embodiments, in order to prevent impurities and fragments of the ruptured metal plating layer 6321 and protective layer 6323 from flowing into the interior of the battery, contaminating the electrolyte and affecting battery performance, a filter film 6322 is provided between the protective layer 6323 and the protrusion 62, or a filter film 6322 is provided inside the interior of the battery case. When the external electrolyte flows into the interior of the battery through the through holes 6311 and the central through-hole 621, the filter film 6322 prevents the fragments of the ruptured metal plating layer 6321 and the fragments of the protective film from flowing out of the battery. The material of the filter film 6322 is one of polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), and filter paper, and the thickness of the filter film 6322 is 0.1 μm to 30 μm. In some other embodiments, the filter membrane 6322 may be provided within the central through-hole 621 or on the surface of the central through-hole 621 close to the inside of the case, either of which can achieve the purpose of preventing fragments of the external metal plating layer 6321 and protective layer 6323 from entering the electrolyte in the battery.

[0100] In some embodiments, a gasket 633 is provided between the fusing mechanism 63 and the protrusion 62 to improve the sealing of the connection between the fusing mechanism 63 and the protrusion 62 . Example 19 29 to 31, this embodiment provides a battery case 79 that is applicable to a soft-packaged battery. The opening 710 of the soft-packaged battery in this embodiment is a protrusion of the battery housing of the soft-packaged battery, and the protrusion has an opening. When the opening is opened, liquid outside the soft-packaged battery can enter the soft-packaged battery through the opening.

[0101] In this embodiment, the battery case 79 is provided with a dissolving mechanism, which is a clamping member 71 that is hollow and has an opening. The clamping member 71 has a slit 72 and has a certain elasticity, which applies a clamping force to the opening 710 of the soft-packaged battery by its own elasticity. During use, the opening 710 is clamped into the hollow part inside the clamping member 71 through the slit 72, and because the clamping member 71 has a certain repulsive force, the repulsive force of the clamping member 71 is used to seal the opening 710. The clamping member 71 is made of a material in which at least a portion, such as the upper or lower half of the slit 72, is soluble in the electrolyte, and it is sufficient that the opening portion 710 opens fully or partially after dissolution. In this embodiment, it is preferable that the entire clamping member 71 is soluble in the electrolyte, and the material used is one of polymethyl methacrylate, silicone rubber polyvinyl chloride, polycarbonate, or ABS plastic, which can be dissolved by the electrolyte when immersed in the electrolyte.

[0102] When a soft-packaged battery having the clamping member 71 is placed in an electrolyte, the clamping member 71 is immersed in the electrolyte and dissolved by the electrolyte, thereby losing its clamping force on the opening 710 and opening the opening 710, allowing the external electrolyte to enter the inside of the battery through the opening 710. The opening 710 is sealed using the dissolving mechanism, which has a simple structure, and the dissolving mechanism is automatically dissolved by the electrolyte when immersed in the electrolyte, thereby opening the opening 710, making it easy to use and requiring no external mechanical operation. Example 20 As shown in FIG. 32 , this embodiment provides a battery case. The battery case 79 is suitable for a soft-packaged battery 711. The battery case 79 is equipped with a dissolving mechanism, which includes a first clamping plate 73, a second clamping plate 74, and several bolts 75. The first clamping plate 73 and the second clamping plate 74 have several through holes. In use, an opening 710 is placed between the first clamping plate 73 and the second clamping plate 74, and the bolts 75 pass through the through holes to connect the first clamping plate 73 and the second clamping plate 74 and sealably clamp the opening 710. A gasket 76 is installed between the first clamping plate 73 and the opening 710 and / or between the second clamping plate 74 and the opening 710. Preferably, only one gasket 76 is installed, which not only saves costs but also achieves a sealing effect. The rivet is made of a material that is soluble in the electrolyte, such as polymethyl methacrylate, silicone rubber polyvinyl chloride, polycarbonate, or ABS plastic, and these materials can be immersed in the electrolyte and dissolved by the electrolyte. Therefore, when the soft-packaged battery 711 having the dissolving mechanism is placed in the electrolyte, the dissolving mechanism is immersed in the electrolyte and the rivet is dissolved and disappears by the electrolyte, thereby losing the clamping force on the opening 710, opening the opening 710, and the electrolyte outside the battery case 79 enters the inside of the battery case 79 through the opening 710.

[0103] In some embodiments, the first clamp plate 73 and the second clamp plate 74 may also be made of a material that is dissolvable in the electrolyte. When a soft-packaged battery 711 having this dissolving mechanism is placed in the electrolyte, the opening 710 is immersed in the electrolyte, and the first clamp plate 73, the second clamp plate 74, and the rivet are all dissolved by the electrolyte, thereby losing their sealing effect on the opening 710, opening the opening 710, and allowing the external electrolyte to enter the soft-packaged battery 711 through the opening 710. If the first clamp plate 73, the second clamp plate 74, and the rivet are all made of a material that is dissolvable in the electrolyte, the soft-packaged battery 711 can be opened more quickly. Those skilled in the art will readily recognize that, depending on the opening speed required to open the opening of the soft-packaged battery 711, one, two, or three of the first clamp plate 73, the second clamp plate 74, and the rivet can be selected to be made of a material that is dissolvable in the electrolyte.

[0104] The opening 710 is sealed using the dissolving mechanism, which has a simple structure. When the dissolving mechanism is immersed in the electrolyte, it is automatically dissolved by the electrolyte to open the opening 710, so the opening can be opened without requiring any external mechanical operation, making it easy to use.

[0105] Naturally, the first clamp plate 73 and the second clamp plate 74 can be clamped by concave and convex engaging portions or other engaging portions provided on the first clamp plate 73 and the second clamp plate 74 without using the bolts 75, in which case one or both of the first clamp plate 73 and the second clamp plate 74 are made of a material that is soluble in the electrolyte. The bolts 75 in the figure can also be rivets, making it easier to connect and fix them. Example 21 33 and 34 , this embodiment provides a battery case 79 suitable for a soft-packaged battery. The battery case 79 is provided with a dissolving mechanism, which includes an outer clip 77 and an inner support 78. The outer clip 77 is a hollow tubular structure with a C-shaped cross section. The inner support 78 is provided within the inner clip. An opening 710 is disposed between the outer clip 77 and the inner support 78. The size and cross-sectional shape of the inner support 78 match the internal shape of the outer clip 77, and the opening 710 is pressed between the outer clip 77 and the inner support 78, thereby sealing the opening of the battery case 79. To further improve the sealing, a gasket 76 may be provided between the outer clip 77 and the opening 710, or between the inner support 78 and the opening of the battery case 79. Alternatively, a gasket 76 may be provided between the outer clip 77 and the opening 710 and between the inner support 78 and the opening of the battery case 79. Under the action of the dissolution mechanism, the opening of the battery case 79 is sealed, and external air and liquid cannot enter the inside of the soft package battery 711 .

[0106] The outer clip 77 of the dissolving mechanism is made of a material that is soluble in the electrolyte, such as polymethyl methacrylate, silicone rubber, polyvinyl chloride, polycarbonate, or ABS plastic, and can be dissolved by the electrolyte when immersed in the electrolyte. Therefore, when a soft-packaged battery having the dissolving mechanism is placed in the electrolyte, the dissolving mechanism is immersed in the electrolyte, and the outer clip 77 is dissolved by the electrolyte, thereby losing its sealing effect on the opening 710, opening the opening 710, and allowing the external electrolyte to enter the inside of the soft-packaged battery.

[0107] In some other embodiments, the outer clip 77 and the inner support 78 are both made of a material that is dissolvable in the electrolyte, allowing the opening 710 to be opened more quickly and easily. In this way, when a soft-packaged battery having the dissolving mechanism is placed in the electrolyte, the dissolving mechanism is immersed in the electrolyte, and both the outer clip 77 and the inner support 78 are dissolved by the electrolyte, causing the dissolving mechanism to lose its sealing effect on the soft-packaged battery, opening the opening 710, and allowing the external electrolyte to enter the inside of the soft-packaged battery.

[0108] In some embodiments, the outer clip 77, the inner support 78, and the gasket 76 are all made of materials that are dissolvable in the electrolyte, so that when the dissolving mechanism is immersed in the electrolyte, the entire dissolving mechanism is dissolved. In some embodiments, the inner support 78 may be a C-shaped hollow tube that matches the shape of the outer clip 77, or may be a solid circular tube. Those skilled in the art will appreciate that the cross-sectional shape of the outer clip 77 may not only be a C-shaped hollow tube, but may also be a hollow tubular structure with a square or trapezoidal cross-section, and the inner support 78 may match the hollow shape of the outer clip 77 to provide a support force that presses against the opening 710, thereby sealing the opening 710.

[0109] The opening 710 is sealed using the dissolving mechanism, which has a simple structure. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so the opening can be opened without requiring any external mechanical operation, making it easy to use. Example 22 As shown in FIGS. 35 and 36 , this example provides a soft-packaged battery including a battery case 79, a positive electrode tab 712, and a negative electrode tab 713. The battery case 79 has an opening 710, and the dissolution mechanism described in Examples 20 and 21 is provided in the opening 710. When the positive electrode tab 712 and the negative electrode tab 713 of the soft-packaged battery 711 are located on the same side of the battery case 79, the opening 710 is located on another side of the battery case 79. For example, the opening 710 is located on the side opposite the side on which the positive electrode tab 712 and the negative electrode tab 713 are located, or on the side adjacent to the side on which the positive electrode tab 712 and the negative electrode tab 713 are located. When the positive electrode tab 712 and the negative electrode tab 713 of the soft-packaged battery are located on the side opposite the battery case 79, the opening 710 is located on the side adjacent to the side on which the positive electrode tab 712 and the negative electrode tab 713 are located.

[0110] When the soft-packaged battery is placed in an electrolyte, the opening 710 is immersed in the electrolyte and sealed by the dissolving mechanism, so that the dissolving mechanism can be dissolved partially or completely by the electrolyte, thereby losing its sealing effect on the opening 710, opening the opening 710, and allowing the external electrolyte to enter the inside of the soft-packaged battery through the opening 710.

[0111] The opening 710 is sealed using the dissolving mechanism, which has a simple structure. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so the opening can be opened without requiring any external mechanical operation, making it easy to use. Example 23 As shown in FIG. 37 , this embodiment provides a large-capacity battery including an outer case 714, a cover plate 715, and a plurality of the soft-packaged batteries 711 described in Example 22. The plurality of soft-packaged batteries 711 are connected in parallel and then housed in a large-capacity battery case 79 to form a large-capacity battery. The dissolution mechanism described in Examples 20 and 21 is attached to an opening 710, the outer case 714 is sealed by a cover plate 715, and an electrolyte is filled in the outer case 714. When the opening 710 is immersed in the electrolyte, part or all of the dissolution mechanism can be dissolved by the electrolyte. When the dissolution mechanism is dissolved and disappears, the opening 710 is opened, and the electrolyte in the outer case 714 enters the soft-packaged batteries 711 through the opening 710. Therefore, all of the soft-packaged batteries 711 are in a unified electrolyte system. This reduces or eliminates the problem of poor cycle performance of the large-capacity battery due to performance differences among individual soft-packaged batteries 711 caused by differential electrolyte consumption during operation of the large-capacity battery.

[0112] The opening 710 is sealed using the dissolving mechanism, which has a simple structure. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so the opening can be opened without requiring any external mechanical operation, making it easy to use. Example 24 As shown in FIG. 38, this embodiment provides a battery case, which is a dissolving mechanism. In this case, the battery case 81 includes a main body layer 811, which has an inner surface 8110 and an outer surface 8111. The inner surface 8110 faces the inner chamber of the battery case, and the outer surface 8111 faces away from the inner chamber of the battery case, i.e., faces the outside of the case. The inner surface 8110 of the main body layer 811 is sequentially provided with an adhesive layer 812 and a heat-seal layer 814. The adhesive layer 812 is a waterproof adhesive layer 812. The adhesive used for the adhesive layer 812 is polyurethane or thermoplastic polyurethane elastomer (TPU), and the heat-seal layer 814 can be bonded to the inner surface 8110 of the main body layer 811 by the adhesive. The heat-seal layer 814 is made of a composite material layer, which is made of hot-melt polypropylene (CPP) and nylon PA6. The thickness of the heat-seal layer 814 is 10 to 50 μm. An adhesive layer 812 and a protective layer 813 are sequentially provided on the outer surface 8111 of the main layer 811, and the protective layer 813 is adhered to the main layer 811 by the adhesive layer 812. The adhesive layer 812 uses an adhesive such as polyurethane or thermoplastic polyurethane elastomer (TPU), and the protective layer 813 is made of nylon PA6. The thickness of the protective layer 813 is preferably 10 to 50 μm.

[0113] In this embodiment, the main body layer 811 is a porous aluminum foil, and the holes in the porous aluminum foil may be circular or rectangular, preferably circular, with a circular hole diameter of preferably 0.5 mm to 1 mm and a thickness of preferably 40 to 100 μm, allowing the electrolyte to pass through the porous aluminum foil smoothly.

[0114] Experiments have confirmed that all of these materials - polyurethane, thermoplastic polyurethane elastomer, polypropylene, and nylon PA6 - can be dissolved in conventional electrolytes, but the dissolution time for each material is different, and that polypropylene (CPP) is a material that does not dissolve in electrolytes.

[0115] The components of the adhesive and the manufacturing method in this example are as follows.

[0116] The adhesive contains, by mass, at least 10% polyurethane or TPU, 1.5% curing agent, 0.5% tackifying resin, 0.2% hydrolysis inhibitor, 58.8% cyclohexane, and 29% butyl ketone, of which cyclohexane and butyl ketone are used as solvents. The curing agent is tert-butylperoxyhexane or an imidazole-based compound, the tackifying resin is a phenolic resin or a modified rosin resin, and the hydrolysis inhibitor is a carbodiimide, oxazoline, or epoxy-based compound.

[0117] The adhesive is produced as follows.

[0118] First, the polyurethane or TPU is heated at 40°C for 24 hours, and then the tackifier resin, hydrolysis inhibitor, mixed solvent (cyclohexane and / or butyl ketone), and curing agent are added sequentially while stirring. The total solids content of the adhesive is 10%. The adhesive is then filtered using a polypropylene (PP) filter element to remove insoluble matter and is ready for use.

[0119] The heat-seal layer 814 is manufactured as follows: CPP and PA6 are mixed uniformly in a 2:1 weight ratio, heated to 250°C, and stirred while heating. The resulting molten plastic is then sandwiched between two rollers and rolled into a film, which is then stretched to a thickness of 10-30 μm. The film is then cooled at room temperature. Because CPP is insoluble in the electrolyte and PA6 is easily soluble in the electrolyte, the rate at which the heat-seal layer 814 formed by hot melting dissolves in the electrolyte is slower than the rate at which PA6 dissolves in the electrolyte. The dissolution time of the dissolving layer can be adjusted by adjusting the CPP to PA6 blending ratio.

[0120] In this embodiment, the mass ratio of CPP and Nylon PA6 in the heat seal layer 814 is not unique. Because CPP is insoluble in the electrolyte and Nylon PA5 is soluble in the electrolyte, the purpose of adding CPP is to adjust the dissolution time of Nylon PA6 in the electrolyte. Therefore, the ratio of CPP and Nylon PA6 can be adjusted according to the time required to dissolve the electrolyte.

[0121] The battery case is manufactured as follows. 1. Drying the adhesive: The manufactured adhesive is dried in a vacuum drying box under nitrogen environment conditions at 60 to 80°C for 24 hours. 2. Degreasing treatment for the porous aluminum foil: The porous aluminum foil is immersed in a degreasing solvent at room temperature for 2 hours. The degreasing solvent is one of acetone, butyl ketone, and trichloroethylene. 3. Bonding the porous aluminum foil layer to the protective layer 813: The degreasing treated aluminum foil layer is combined with the dried adhesive, and the adhesive layer 812 is bonded to the outer surface 8111 of the porous aluminum foil layer. After the combination, the mixture is aged, and the protective layer 813 is bonded to the outer surface 8111 of the porous aluminum foil using a roll coating method. 4. Bonding of porous aluminum foil layer and heat seal layer 814: An adhesive is applied to the inner surface 8110 of heat seal layer 814, and the thickness of the applied adhesive is controlled to 3 μm. After drying in an oven, the adhesive-coated surface of heat seal layer 814 and aluminum foil are thermocompressed to combine them and bonded to the inner surface 8110 of porous aluminum foil. The oven temperature is 85°C, and the amount of dried rubber applied is 2.4 g / m2. 5. Forming of battery case: The combined battery case is placed in an aging chamber and aged for 5 days at an aging temperature of 40°C.

[0122] The materials of the heat seal layer 814 and the protective layer 813 can both be dissolved in conventional electrolytes. Therefore, when the battery case 81 is placed in an electrolyte for a certain period of time, the heat seal layer 814 and the protective layer 813 are dissolved by the electrolyte, and only the main body layer 811 remains, encasing the electrode assembly 87.

[0123] Because the protective layer 813 and the heat-sealing layer 814 are thin and the materials are not hard, the main body layer 811 can play a supporting role, and the protective layer 813 and the heat-sealing layer 814 can completely encase the electrode assembly 87.

[0124] As shown in Figure 41, a plurality of cells 84 having the battery case of this embodiment are placed in an outer case 85, and the electrolyte chamber 86 of the large-capacity battery is filled with electrolyte. The case protective layer 813 and heat-seal layer 814 of the cells 84 are gradually dissolved in the electrolyte of the large-capacity battery. After the protective layer 813 and heat-seal layer 814 have both dissolved and disappeared, only the main body layer 811 remains in the case of the cells 84. Because the main body layer 811 is made of porous aluminum foil, the electrolyte can penetrate through the porous aluminum foil. Therefore, the electrode assemblies 87 of all the cells 84 are immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no difference in the consistency of the electrolyte of the cells 84, which further improves the performance of the large-capacity battery. Example 25 As shown in Figure 39, the present embodiment differs from Example 24 in that an adhesive layer 812, a protective layer 813, and a heat-seal layer 814 are sequentially provided on the inner surface 8110 of the main body layer 811, i.e., the protective layer 813 is added between the adhesive layer 812 and the heat-seal layer 814 of Example 24.

[0125] In this embodiment, the main body layer 811 is a porous aluminum foil, and the holes in the porous aluminum foil may be circular or rectangular, preferably circular. The circular holes have a diameter of 0.5 mm and a thickness of 40 μm, allowing the electrolyte to pass through the porous aluminum foil. The main body layer 811 has an inner surface 8110 facing the inner chamber of the case and an outer surface 8111 facing away from the inner chamber of the case. An adhesive layer 812, a protective layer 813, and a heat-seal layer 814 are sequentially formed on the inner surface 8110 of the main body layer 811. The adhesive layer 812 is a waterproof adhesive layer 812 made of an adhesive such as polyurethane or thermoplastic polyurethane elastomer (TPU), and the heat-seal layer 814 can be bonded to the inner surface 8110 of the main body layer 811. The heat-seal layer 814 is a composite material layer made of hot-melt polypropylene (CPP) and nylon PA6. The heat-seal layer 814 has a thickness of 10 μm. An adhesive layer 812 and a protective layer 813 are provided on the outer surface 8111 of the main layer 811, and the protective layer 813 is adhered to the main layer 811 by the adhesive layer 812. The material used for the adhesive layer 812 is polyurethane or thermoplastic polyurethane elastomer (TPU), and the protective layer 813 is nylon PA6. The thickness of the protective layer 813 is preferably 10 to 50 μm.

[0126] In this example, the adhesive ingredients and manufacturing method are the same as those in Example 24.

[0127] The battery case is manufactured as follows: 1. Drying the adhesive: The manufactured adhesive is dried in a vacuum drying box under nitrogen conditions at 60-80°C for 24 hours. 2. Degreasing the porous aluminum foil: The aluminum foil is immersed in a degreasing solvent at room temperature for 2 hours. The degreasing solvent is one of acetone, butyl ketone, and trichloroethylene. 3. Bonding the porous aluminum foil layer to the protective layer 813: The dried adhesive is combined with the outer surface 8111 of the degreased aluminum foil layer. After combining, the mixture is aged and the protective layer 813 is bonded to the outer surface 8111 of the aluminum foil layer by roll coating. 4. Applying the heat-seal layer 814 to the protective layer 813: CPP and PA6 particles are uniformly mixed in a 2:1 mass ratio, heated to 250°C, and stirred while heating. After uniform stirring, the protective layer 813 is coated by roll coating while hot to a thickness of 10-30 μm. The mixture is then cooled at room temperature. 5. Bonding of porous aluminum foil layer to protective layer 813 coated with heat seal layer 814: The dried adhesive is compounded with inner surface 8110 of the degreased aluminum foil layer, and after compounding, aging is carried out, and the surface of protective layer 813 in step 4 that is not coated with heat seal layer 814 is bonded to inner surface 8110 of the aluminum foil layer by a roll coating method. 6. Forming of battery case: The compounded battery case is placed in an aging chamber and aged for 5 days at an aging temperature of 40°C.

[0128] Both the heat-sealing layer 814 and the protective layer 813 are soluble in conventional electrolytes, so that the battery case 81 can be slowly dissolved by the electrolyte after being placed in the electrolyte for a certain period of time. The purpose of adding the protective layer 813 in this embodiment is to provide additional protection for the battery case. Because the heat-sealing layer 814 is thin, it serves to support the main body layer 811 to prevent the battery case from being damaged by external forces, and also increases the time for the battery case to dissolve in the electrolyte.

[0129] As shown in Figure 41, a number of cells 84 having the battery case of this embodiment are placed in an outer case 85, and the electrolyte chamber of the large-capacity battery is filled with electrolyte. The protective layer 813 and heat-seal layer 814 of the case of the cell 84 are gradually dissolved in the electrolyte of the large-capacity battery. After the protective layer 813 and the heat-seal layer 814 are both dissolved and gone, only the main layer 811 remains in the case of the cell 84. Because the main layer 811 is made of porous aluminum foil, the electrolyte in the electrolyte chamber can pass through the porous aluminum foil. The electrode assemblies 87 of all the cells 84 are immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no difference in the consistency of the electrolyte of the cells 84, which further improves the performance of the large-capacity battery. Example 26 As shown in Figure 40, this embodiment provides a cell, and the cell 84 is a soft-packaged battery, mainly including an electrode assembly 87, a battery positive electrode 82, a battery negative electrode 83, and a battery case 81 as described in Example 24 or Example 25, with an electrolyte contained within the battery case 81. When the cell 84 having the battery case of this embodiment is placed in the electrolyte compartment of a large-capacity battery, it can dissolve in the electrolyte by itself, without requiring mechanical manipulation, and the case has a simple structure and is highly versatile.

[0130] A plurality of cells according to this embodiment are placed in an outer case 85, and the electrolyte chamber 86 of the large-capacity battery is filled with electrolyte. The protective layer 813 and heat-seal layer 814 of the case of each cell 84 are gradually dissolved in the electrolyte of the large-capacity battery. After the protective layer 813 and heat-seal layer 814 are both dissolved and gone, only the main layer 811 remains in the case of each cell 84. Because the main layer 811 is made of porous aluminum foil, the electrode assemblies 87 of all cells 84 are immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no difference in the consistency of the electrolyte of the cells 84, which further improves the performance of the large-capacity battery. Example 27 42 to 44, this embodiment provides a plastic case battery including a battery case 910, a plurality of soft-packaged cells 91, an upper cover assembly 92, a positive electrode pole 96, a negative electrode pole 98, a burst relief valve 93, and a conductive connection sheet 95. The battery case 910 accommodates the plurality of soft-packaged cells 91, and the soft-packaged cells 91 have openings 917. The positive electrode tabs 94 and negative electrode tabs 95 of the soft-packaged cells 91 are connected to the positive electrode poles 96 and negative electrode poles 98 of the upper cover assembly 92 via the conductive connection sheet 95. The upper cover assembly 92 seals the battery case 910. The upper side of the battery case 910 has a case opening 911, and a dissolving mechanism 913 is provided in the case opening 911. In this embodiment, the dissolving mechanism 913 is a 2 mm-thick polymethylmethacrylate sheet that can cover the opening and is attached to the opening in a sealed manner.

[0131] Before manufacturing this plastic case battery, the soft package cells 91 are pre-filled and capacity graded, and then the soft package cells 91 with the highest yield are selected. Holes are punched in the aluminum plastic film of the soft package cells 91, and the soft package cells 91 are connected in parallel and sealed in a plastic case to produce a plastic case battery. When the battery is in its natural state, the interior of the battery case 910 is sealed and isolated from the outside. When the plastic case battery is placed in an external electrolyte or the case opening 911 is connected to an electrolyte pipe, the polymethyl methacrylate sheet is dissolved by the electrolyte, and the electrolyte flows into the cell case through the opening. Because there is an opening in the aluminum plastic film of the soft package cell 91, the electrolyte also flows into the soft package cell 91, so that multiple soft package cells 91 are in the same electrolyte system.

[0132] In another embodiment, the dissolving mechanism 913 includes a 0.1 mm thick polyethylene film and a 2 mm thick polymethyl methacrylate sheet, and the polyethylene film can cover the case opening 911, and the polyethylene film is attached to the surface of the polymethyl methacrylate facing the case opening 911, and the case opening 911 is sealed by the dissolving mechanism 913.

[0133] When the battery is in its natural state, the interior of the battery case 910 is sealed and isolated from the outside. When the plastic case battery 916 is placed in an external electrolyte, the polymethyl methacrylate sheet is dissolved by the external electrolyte, and then, under the action of the fluid, the polypropylene film falls off from the opening and no longer seals the case opening 911. The electrolyte flows into the cell case through the opening. Because the aluminum plastic film of the soft package cell 91 has an opening, the electrolyte also flows into the soft package cell 91, so that multiple soft package cells 91 are in the same electrolyte system. Example 28 As shown in Figure 45, this embodiment provides a plastic case battery, which differs from Example 27 in that a battery case 910 has a case opening 911, a contact tube 912 is provided in the case opening 911, the contact tube 912 and the case opening 911 are fixed together by adhesive, and the contact tube 912 is connected to the inner chamber of the battery case 910. In this embodiment, the dissolving mechanism 913 is a polymethyl methacrylate sheet with a thickness of 2.5 mm, which is fixed and adhesively attached inside the contact tube 912 and seals the case opening 911.

[0134] In one embodiment, the dissolving mechanism 913 includes a 0.1 mm thick polyethylene film and a 2 mm thick polymethyl methacrylate sheet, the polyethylene film can cover the case opening 911, and the polyethylene film is attached to cover one side of the polymethyl methacrylate sheet, a contact tube 912 is adhered to the case opening 911, the contact tube 912 penetrates the inner chamber of the battery case 910, the dissolving mechanism 913 is fixedly connected to the contact tube 912, and the polyethylene film is attached to the polymethyl methacrylate so that it covers one side of the inside of the case, and the case opening 911 is sealed by the dissolving mechanism 913 attached to the contact tube 912. Example 29 As shown in Figures 46 and 47, this embodiment provides a large-capacity battery including a plurality of plastic case batteries 916 and a multi-drop liquid storage pipeline, and the multi-drop liquid storage pipeline includes a main pipeline 914 and a plurality of branch pipes 915, the inner chamber of the main pipeline 914 is a liquid storage chamber 917 for storing electrolyte, the branch pipes 915 and the openings of the plastic case batteries 916 are connected in a one-to-one correspondence, and a dissolving mechanism 913 is provided in the case opening 911, and the dissolving mechanism 913 in this embodiment is a polymethyl methacrylate sheet with a thickness of 2 mm, which is sealed and bonded to the case opening 911, and when electrolyte is injected into the multi-drop liquid storage pipeline through the liquid injection gas vent 918, the electrolyte is dissolved in the main pipeline 914 and the branch pipes 915. The electrolyte enters each plastic-cased battery 916 through a tube 915, and a polymethyl methacrylate dissolving sheet is placed at the opening of the plastic-cased battery 916. After the dissolving sheet is dissolved away by the electrolyte, the electrolyte in the tube and the plastic-cased battery 916 pass through, allowing the electrolyte to enter the plastic-cased battery 916 and then into each soft-packaged cell 91, with the electrolyte contained in the reservoir chamber. Therefore, the plastic-cased battery 916 to which the soft-packaged cell 91 is attached and the reservoir chamber are both in a common electrolyte system, which reduces the problem of differences in battery performance caused by different electrolyte consumption during battery use, and the large-capacity batteries have good uniformity.

[0135] The soft package cells 91 in the plastic case battery 916 are all chemistry capacity grading and conformity screening before being sealed in the battery case, so the entire large capacity battery has good conformity.

Claims

1. At least a part of the material has a dissolving mechanism that allows it to dissolve in an electrolyte solution; a case opening is provided, the case opening is sealed by the dissolution mechanism, the dissolution mechanism includes a dissolution base layer, and when the dissolution base layer contacts with the electrolyte, the dissolution base layer dissolves, opening the case opening, and connecting the inner chamber of the battery case to the outside; The dissolution mechanism further includes an isolation layer attached to the inner surface of the dissolution base layer, and the inner surface of the dissolution base layer is the surface facing the inner chamber of the battery case.

2. The battery case according to claim 1, characterized in that the material of the soluble base layer is at least one of polystyrene (PS), polymethyl methacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene dimethyl methacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, styrene-butadiene copolymer, and polystyrene, and polydodecanamide or polyamide is preferred.

3. 2. The battery case according to claim 1, wherein the separator is a film that is insoluble in an electrolyte solution.

4. 2. The battery case of claim 1, wherein the separator is an separator coating layer applied to the inner surface of the dissolving base layer, the separator coating layer includes an adhesive and a solvent, the adhesive is at least one of polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethylcellulose, and polyvinyl alcohol, and the solvent is at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylformamide, dimethyl sulfoxy, tetrahydrofuran, and water or an alcohol, and the separator adheres the dissolving base layer to the case opening.

5. The battery case according to claim 1, characterized in that a fixing portion is provided on the outside of the case opening to fix the dissolving mechanism, the fixing portion has a through passage communicating with the interior of the battery case, and the dissolving mechanism is provided inside the fixing portion to seal the through passage.

6. The battery case according to claim 3, characterized in that a fixing portion is provided on the outside of the case opening to fix the dissolving mechanism, the fixing portion has a through passage communicating with the interior of the battery case, and the dissolving mechanism is provided inside the fixing portion to seal the through passage.

7. The battery case according to claim 4, characterized in that a fixing portion is provided on the outside of the case opening to fix the dissolving mechanism, the fixing portion has a through passage communicating with the interior of the battery case, and the dissolving mechanism is provided inside the fixing portion to seal the through passage.

8. 6. The battery case according to claim 5, wherein a cradle is provided within the through-passage for placing the dissolving mechanism.

9. 7. The battery case according to claim 6, wherein a cradle is provided within the through passage for placing the dissolving mechanism.

10. 8. The battery case according to claim 7, wherein a cradle is provided within the through-passage for placing the dissolving mechanism.

11. A single battery, characterized in that the case is the battery case according to any one of claims 1 to 10.

12. 12. The battery according to claim 11, wherein the battery case is sealed by an upper cover assembly, and at least one soft package cell is provided therein, the soft package cell has an opening in an enclosing bag, the upper cover assembly is provided with a positive electrode post, a negative electrode post, and a burst relief valve, and the positive electrode tab and the negative electrode tab of the soft package cell are electrically connected to the positive electrode post and the negative electrode post of the upper cover assembly by a conductive connection sheet.

13. 12. A large-capacity battery comprising at least two of the cells according to claim 11 and a multi-drop liquid storage pipeline including a main pipeline and at least two branch pipes, wherein a liquid storage chamber for storing an electrolyte is provided in the main pipeline, and the branch pipes and case openings are connected in a one-to-one correspondence.

14. 12. A large-capacity battery comprising an outer case and a plurality of the unit cells according to claim 11, wherein the outer case has an electrolyte chamber filled with an electrolyte, and the unit cells are housed in the electrolyte chamber.

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