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 the conventional application of lithium batteries, in order to meet the requirements of large-capacity scenarios, it is often necessary to connect multiple cells in parallel. When multiple cells are connected in parallel to form a large-capacity battery, the performance parameters of each cell, such as capacity, resistance, voltage, etc., will vary, which will affect the performance of the entire large-capacity battery. In addition, after each cell connected in parallel works for a certain period of time, the electrolyte consumption of each cell will be different, which will cause a large difference in the performance of each cell, which will result in poor uniformity between each cell, and will further affect the performance and service life of the entire large-capacity battery. Therefore, in order to improve the performance and service life of the large-capacity battery, it is necessary to solve the consistency problem of each cell.

[0003] By allowing the electrolyte of multiple cells to flow between each other so that the multiple cells are in a uniform electrolyte system, the problem of poor consistency between the individual cells due to different electrolyte consumption is solved, but the issue of how to connect the electrolyte chambers of the multiple cells to 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, the battery case having a simple structure and a case structure that can connect the electrolyte chambers of each cell 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.

[0007] Furthermore, a case opening is provided in the battery case, and the case opening is sealed by the dissolution mechanism, and the dissolution mechanism includes a dissolution base layer. When the dissolution base layer connects with the electrolyte, the dissolution base layer dissolves, the case opening is opened, and the interior of the battery case is penetrated to the outside.

[0008] Furthermore, the material of the soluble base layer is at least one of polystyrene (PS), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-methylmethacrylate 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 is preferably a polyamide soluble 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, the isolation 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, the solvent is at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylformamide, dimethylsulfoxy, tetrahydrofuran, and water or alcohols, and the isolation layer adheres the dissolving base layer to the case opening.

[0012] Additionally, a pedestal is provided within the through passageway for placement of 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), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-methyl-dimethacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, and styrene-butadiene copolymer.

[0014] Further, the dissolving mechanism includes an isolation assembly and a dissolving assembly, the battery case is provided with 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] Additionally, the isolation assembly is a sphere or a cone.

[0016] Further, the dissolving mechanism includes an isolation assembly, a dissolving assembly, and a push-up assembly, and the battery case is provided with at least one case opening, in which an isolation assembly and a dissolving assembly are sequentially provided along a direction away from the battery case interior chamber, 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] Further, 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] Further, the battery case is provided with an attachment portion having a through-hole, and the dissolving mechanism includes a base, a connecting tube protruding from the base, and a dissolving assembly, the base is provided with a through-hole that penetrates the connecting tube, the dissolving assembly is provided within the connecting tube, the connecting tube is sealed by the dissolving assembly, the connecting tube penetrates the mounting hole from the inside to the outside of the battery case, and 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, and the electrolyte enters 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 hole diameter of the first hole is larger than the hole diameter of the second hole, the base is drilled into the first hole, and the connecting tube is drilled into the second hole.

[0020] Furthermore, the dissolving mechanism further includes a nut, a gasket and a sealing ring, the connecting tube has a male thread matching 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 sealing ring is provided between the base and the mounting portion.

[0021] Furthermore, the dissolvable assembly includes a dissolvable sheet that is soluble in an electrolyte and a protective film that is not soluble in an electrolyte, the protective film being 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 melting mechanism further includes a pressing member for pressing and fixing the melting 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 to cover the case opening, and the dissolution mechanism includes a dissolution layer and an isolation layer, the dissolution layer is dissolvable 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 a surface of the dissolution layer that faces the inner chamber of the battery case.

[0024] Furthermore, the metal plating layer is an aluminum plating layer or a copper plating layer, 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, a projection of the inner area of ​​the metal ring covers the case opening area, and 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 inner chamber of the battery case.

[0026] Furthermore, a ring-shaped adhesive layer is provided between the filter membrane and the case body and between 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 a 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 an electrolyte.

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

[0031] Furthermore, a metal plating layer that is insoluble in the electrolyte is applied to the surface of the dissolvable sheet facing the inner chamber 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 disposed within the central through-hole and positioned on the side of the protective layer closer to the inside of the battery case.

[0033] Furthermore, the dissolution mechanism is clamped to the opening portion of the battery case so that the opening portion of the battery case can be opened after the unit 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 formed therein, 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 to achieve a hermetic seal.

[0036] Furthermore, the first clamp plate and the second clamp plate are fixed together by a riveting or bolting method, 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 disposed 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 the battery case 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, the outer surface is a surface away from the battery case interior, the main body layer is a porous metal foil layer, and is used to communicate between the inside and outside of the battery case and the electrolyte, and the adhesive layer and the protective layer are dissolvable in the electrolyte.

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

[0040] Furthermore, the main body layer is a single-layer or multi-layer porous metal foil, the porous metal foil pores are circular and have a pore diameter of 0.5 mm to 1 mm, the protective layer is a nylon PA6 protective layer, the protective layer 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 body layer and the protective layer / heat seal layer, and the heat seal layer is a composite layer made of a hot melt mixture of polypropylene (CPP) and nylon PA6.

[0041] The present application further provides a battery, the case of which is the battery case according to any one of the above aspects.

[0042] Furthermore, the battery case is sealed by a top cover assembly, and at least one soft package cell is provided therein, an opening is provided in the sealing bag of the soft package cell, a positive electrode post, a negative electrode post and a burst relief valve are provided in the top cover assembly, 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 top cover assembly by a conductive connection sheet.

[0043] The present application further provides a large-capacity battery comprising at least two of the above-mentioned single cells and a multi-drop liquid storage pipeline, the multi-drop liquid storage pipeline including a main pipeline and at least two branch pipelines, a liquid storage chamber for storing an electrolyte is provided in the main pipeline, and the branch pipelines 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-mentioned cells, wherein an electrolyte chamber is provided within the outer case, the electrolyte chamber is filled with an electrolyte, and the cells are accommodated in the electrolyte chamber. Effect of the Invention

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

[0046] 1. The present application provides a dissolution mechanism in a battery case of a single cell, and the dissolution mechanism is installed in the case opening of the battery case. When the battery is in a natural state, the dissolution mechanism can seal the battery case so as to isolate the inner chamber of the battery case from the outside. When the dissolution mechanism is placed in the external electrolyte, the dissolution mechanism can be dissolved by the electrolyte outside the battery case so that the electrolyte flows into the inside of the battery case. This realizes the injection of electrolyte into the single cell and the unification of a plurality of single cells into a unified electrolyte system, thereby reducing the differences between the single cells caused by different consumption of electrolyte, and improving the consistency and stability of the single cells, thereby improving the performance of the battery.

[0047] 2. The polyamide soluble base layer of the dissolving mechanism in the battery case of the present application becomes hydrophilic after being dissolved by the electrolyte, has good water absorption, and can capture moisture in the electrolyte, play the role of an electrolyte additive, and also improve 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, and the installation of the dissolving assembly can be achieved by simply gluing the dissolving assembly to the case opening.

[0049] 4. The battery case of the present invention is easy to manufacture, reliable to use, does not require mechanical manipulation, allows multiple cells to share an electrolyte, and is highly applicable.

[0050] 5. The battery case provided in the present application has a dissolving mechanism covering the case opening, and the dissolving layer in the dissolving mechanism can be dissolved by the electrolyte, and the metal plating layer on the dissolving layer prevents the electrolyte in the battery case from dissolving the dissolving layer. When there is no electrolyte outside the battery, the electrolyte inside the battery cannot dissolve the dissolving layer due to the metal plating layer, and the inside of the battery is sealed. When a number of single cells having the battery case are placed in the electrolyte chamber of a large-capacity battery, the dissolving layer is dissolved by the electrolyte outside the battery case, and after the dissolving layer is dissolved, the metal plating layer bursts, and the electrolyte enters the inner chamber of the battery case through the case opening, so that the multiple single cells are in a common electrolyte environment, which reduces the difference between the individual cells caused by different electrolyte consumption, and improves the consistency and life of the individual cells.

[0051] 6. The filter membrane structure in the battery case of the present application allows the electrolyte to pass freely, while impurities such as solid particles cannot pass through the filter membrane. This prevents metal fragments and insoluble matter remaining after the dissolving sheet dissolves from entering the battery and affecting its performance, which may lead to a short circuit.

[0052] 7. In the present application, a protrusion with a central through hole is provided on a battery case. When a cell having the battery case is in a normal state, the battery case is sealed by a dissolving mechanism, and the electrolyte in the cell is isolated from the outside. When one or more cells having the battery case are placed in an electrolyte chamber of a large-capacity battery, the dissolving sheet is dissolved, and the external electrolyte enters the cell through the protrusion of the case, so that the electrolyte chamber of the cell communicates with the electrolyte chamber of the large-capacity battery, and the cells are in a common electrolyte system. In this structure, the dissolving sheet is directly fixed using a cap, and compared with the conventional hot melt method, the fixing method of the dissolving mechanism of the battery case is simple, easy to operate, and has a good sealing effect after fixing 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 its own elastic or screw connection to realize a fixed sealing of the dissolving sheet, which is more reliable and easier to operate and assemble.

[0054] 9. The present application relates to a method for connecting a plurality of single cells having the dissolving mechanism in parallel to form a group, and then placing the group in a housing of a large-capacity battery filled with electrolyte. Under the action of the electrolyte, a part or all of the dissolving mechanism dissolves, and the electrolyte enters the inside of the single cells through the opening, so that the plurality of single cells are in a common electrolyte system, which reduces the difference between the individual cells due to different electrolyte consumption, and improves the performance and service life of the entire large-capacity battery.

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

[0056] 11. The battery case provided in the present application is mainly composed of a main layer having a porous metal foil, a protective layer whose inner and outer surfaces are dissolvable in an electrolyte, and a heat-seal layer bonded together. Since the materials of the protective layer and the heat-seal layer are dissolvable in an electrolyte, when multiple cells having the soft-package battery case are placed in an electrolyte chamber of a large-capacity battery, the protective layer and the heat-seal layer will be dissolved by the electrolyte themselves, and the electrolyte will penetrate the main layer having the porous metal foil, so that part or all of the electrode assembly will be immersed in the electrolyte, and the multiple cells will be in a common electrolyte environment, which will reduce individual differences between batteries caused by different electrolyte consumption and improve the consistency and lifespan of each cell.

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

[0058] 13. In the present application, a soft packaged cell of a finished product is pre-filled and capacity graded, and then a soft packaged cell with good consistency is selected. A plurality of soft packaged cells are connected in parallel and enclosed in a battery case. A dissolution 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 dissolution mechanism is opened and electrolyte is injected into the battery, thereby realizing the injection of electrolyte into the battery and the formation of a plurality of batteries into a unified electrolyte system.

[0059] 14. The soft package cells in the battery of the present application have good consistency, so that the produced batteries have good yields, and since the battery has a unified electrolyte system, the problem of inconsistent battery performance caused by uneven electrolyte consumption during battery use is reduced, so that the batteries have good uniformity and the service life and stability of the batteries are improved.

[0060] Other advantages, objectives 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 the study and practice of the present application. [Brief description 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 in Example 1 of the present application. [Diagram 2] FIG. 4 is a schematic structural diagram of a battery case in Example 2 of the present application. [Diagram 3] FIG. 11 is a schematic structural diagram of a battery case in Example 3 of the present application. [Figure 4] FIG. 11 is a schematic structural diagram of a battery case in Example 4 of the present application. [Diagram 5] FIG. 11 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 in Examples 1 to 6 of the present application. [Figure 8] FIG. 13 is a schematic structural diagram of a battery case in Example 7 of the present application. [Figure 9] FIG. 13 is a partial cross-sectional view of a battery case in Example 7 of the present application. [Figure 10] FIG. 13 is a schematic structural diagram of a battery case in Example 8 of the present application. [Figure 11] FIG. 11 is a partial cross-sectional view of a battery case in Example 8 of the present application. [Figure 12] FIG. 13 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. 11 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 in Example 11 of the present application. [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. 15 is a schematic structural diagram of a multi-drop 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. 2 is a schematic structural diagram of a unit cell in Example 15 of the present application. [Diagram 25] FIG. 2 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 diagram of a 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. 2 is a schematic cross-sectional view of the dissolution mechanism in Example 19 of the present application. [Diagram 30] FIG. 1 is a schematic structural diagram of the dissolution mechanism in Example 19 of the present application. [Diagram 31] FIG. 23 is a schematic diagram showing the attachment of a dissolution mechanism and a battery case in Example 19 of the present application. [Diagram 32] FIG. 13 is a schematic diagram showing how a dissolving mechanism is attached to an opening portion in Example 20 of the present application. [Diagram 33] FIG. 11 is a schematic cross-sectional view of the dissolution mechanism in Example 21 of the present application. [Diagram 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. [Diagram 35] FIG. 1 is a schematic structural diagram of a soft package battery in Example 22 of the present application. [Diagram 36] FIG. 2 is a schematic structural diagram 2 of a 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. [Diagram 40] FIG. 2 is a schematic diagram showing the cross-sectional structure of a unit cell in Example 26 of the present application. [Diagram 41] FIG. 2 is a schematic diagram of a unit cell in Example 26 of the present application placed in an outer case. [Diagram 42]FIG. 27 is a schematic diagram of the connection between multiple soft package cells and an upper cover assembly in Example 27 of the present application. [Diagram 43] FIG. 2 is a schematic structural diagram of a single soft package cell in Example 27 of the present application. [Diagram 44] FIG. 2 is a schematic structural diagram of a plastic case battery in Example 27 of the present application. [Diagram 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 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 tube, 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...projection, 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...pouring port, 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, 711...soft package battery, 712...positive electrode tab, 713...negative electrode tab, 714...outer case, 715...cover plate, 81...battery case, 811...main 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...Abutment tube, 913...Dissolution mechanism, 914...Main pipe, 915...Branch tube, 916...Plastic case battery, 917...Storage chamber, 918...Injection gas vent. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0063] Hereinafter, the present application will 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 the present application may be a battery case for a soft package battery or a battery case for a hard shell battery, and its use is not limited to the use of a certain type of battery. The battery case in the present application has a dissolution mechanism, in which case the battery case may be the dissolution mechanism, or the dissolution mechanism may be provided at the case opening or the opening part of the battery case. When the dissolution mechanism comes into contact with the electrolyte, the entire dissolution mechanism may dissolve the electrolyte, or a part of it may dissolve the electrolyte, as long as it can form a passage through which the electrolyte flows after the dissolution mechanism comes into contact with 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 position that makes it easy to place the dissolution assembly in the electrolyte chamber of the large-capacity battery, or a position that makes it easy to communicate with the inner chambers of multiple single cells, and when the dissolution mechanism comes into contact with the electrolyte, the inner chamber of the battery case is penetrated to the outside. Example 1 As shown in FIG. 1, this embodiment provides a battery case, and a battery case 11 is provided with a case opening 12 and a dissolving mechanism 13, and the case opening 12 is usually circular. In this embodiment, the dissolving mechanism 13 is a dissolving base layer that can be dissolved in an electrolyte, and the dissolving base layer is a circular sheet whose diameter is larger than that of the case opening 12, and is covered by the case opening 12. The material of the dissolving base layer is one of polystyrene (PS), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-dimethylmethacrylate 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, 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] It has been confirmed through experiments that when these materials, such as polystyrene (PS), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-dimethylmethacrylate copolymer (SMMA), acrylonitrile-butadiene-styrene copolymer (ABS), acrylic ester rubber-styrene-acrylonitrile copolymer (ASA), polyoxymethylene, polydodecanamide, polyamide, imide PAI, styrene-butadiene copolymer, etc., are immersed in conventional electrolyte for a certain period of time, they are gradually dissolved by the electrolyte and disappear. Different materials take different times to be dissolved by the electrolyte, and the dissolution time is 1 to 7 days, during which other assembly operations can be performed.

[0066] Those skilled in the art can easily imagine that the material of the soluble base layer may be one or more layers, and may be made by pressing or stacking two or more of the materials listed in this embodiment, and that the dissolution rate and dissolution time of a soluble base layer made of a combination of different materials will be different when dissolved in the electrolyte.

[0067] As shown in FIG. 7 , when a plurality of 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 that the case opening 12 is immersed in the electrolyte and the dissolving base layer gradually disappears as it dissolves in the electrolyte. Thus, the case opening 12 is opened, penetrating the inside and outside of the battery case 11, 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, which will result in differences in the performance of the individual cells and poor consistency among the individual cells. A number of individual cells with the case are placed in the electrolyte chamber 16 of the large-capacity battery 15, and the electrolyte chamber 16 is filled with electrolyte. After the dissolution base layer 131 of the case opening 12 dissolves in the electrolyte, the electrolyte of the large-capacity battery flows into the inside of the battery, and the electrolyte of all the individual cells is connected to the electrolyte chamber of the large-capacity battery, so that the electrolyte of all the individual cells is in a uniform state, thereby reducing the difference between the batteries, thereby improving the consistency and stability of the batteries and improving the performance of the batteries. Example 2 As shown in FIG. 2, this embodiment provides a battery case, in which a 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 is the surface facing the case inner chamber, 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 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, dimethylsulfoxy, tetrahydrofuran, and water or alcohols.

[0070] The manufacturing method of the isolation coating layer 132 in this embodiment is as follows: Take 10g of adhesive and put it into 90g of solvent, and stir it evenly to form a mobile phase paint, and then spray the paint evenly on the inner surface of the dissolving base layer 131, the inner surface is the surface of the dissolving base layer 131 facing the case inner chamber, and the selected adhesive is not dissolved in the electrolyte, so the formed isolation coating layer 132 is also not dissolved in the electrolyte, and an isolation layer that is not dissolved in the electrolyte is formed on the inner surface of the dissolving base layer 131, and the inner surface of the dissolving base layer 131 covers the case opening 12, and the isolation coating layer 132 contains adhesive, so that the dissolving base layer 131 can be attached to the case opening 12, and the area of ​​the dissolving base layer 131 is larger than the area of ​​the case opening 12, so that the dissolving mechanism 13 can seal the case 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, and can be adjusted according to the size of the case opening 12 and the dissolving base layer 131.

[0072] In another embodiment, the above-mentioned 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 soluble base layer 131, which is the surface of the soluble base layer 131 facing the inner chamber of the case. The soluble mechanism 13 covered by the isolation layer is fixed to the case opening 12 by adhesion, and the area of ​​the soluble base layer 131 is larger than the area of ​​the case opening 12, so that the soluble 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, the electrolyte chamber 16 is a shared electrolyte chamber, the electrolyte chamber 16 is filled with 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, so that the dissolving base layer 131 is not dissolved by the electrolyte inside the single cell, and the dissolving base layer 131 is dissolved only by the electrolyte outside the single cell. 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 isolating coating layer 132 applied to the inner surface of the dissolving base layer 131 loses its adhering carrier, and the case opening 12 is no longer sealed. Under the fluid action of the electrolyte, the case opening 12 is opened, penetrating the inside and outside of the cell case 11, 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, in which a 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 in which an isolation layer is covered 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 of the dissolving base layer 131 listed in Examples 1 and 2, the fixing part 14 is provided outside the case opening 12, the fixing part 14 is provided with a base 143, a through passage 142 and a receiving stand 141 in the through passage 142, the through passage 142 is a cylindrical passage, the through passage 142 and the case opening 12 are connected to each other, the diameter of the through passage 142 is equal to or greater than the diameter of the case opening 12, the dissolving mechanism 13 is fixedly placed on the receiving stand 141, and the fixing manner may be adhesive, and 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, in which the battery case 11 is provided with a case opening 12 and a dissolving mechanism 13, the dissolving mechanism 13 includes a dissolving base layer 131 and an isolation assembly 133, and the case opening 12 is generally 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 such as glass or plastic that is not dissolved in the electrolyte, the dissolving base layer 131 is a cylindrical structure with a thickness of 2 mm and an open end, which surrounds the isolation assembly 133 and presses it against the case opening 12 to seal the case opening 12, and the dissolving mechanism 13 is fixed to the case opening 12 by a method such as adhesion. The material of the dissolving base layer 131 in this embodiment may be the material of the dissolving base layer in Example 1. It has been confirmed through experiments that the above material can be dissolved by the electrolyte.

[0074] As shown in FIG. 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, and 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 by dissolving 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, and the case opening 12 is opened, penetrating the inside and outside of the single cell, and the electrolyte flows into the single cell through the case opening 12, thereby realizing communication between the electrolyte chamber inside the single cell and the electrolyte chamber of the large-capacity battery. Example 5 As shown in Figures 5 and 6, this embodiment provides a battery case, in which the battery case 11 is provided with a case opening 12, a fixing part 14 and a dissolving mechanism 13, the dissolving mechanism 13 includes a dissolving base layer 131 and an isolation assembly 133, the fixing part 14 is a tubular structure fixedly provided on the outside of the case opening 12, the material of the fixing part 14 is metal or plastic that is insoluble in the electrolyte, and the fixing method is bonding or welding, the fixing part 14 includes a through passage 142, and the through passage 142 penetrates the inner chamber of the battery case and the outside 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 the material thereof may be a material that is insoluble in the electrolyte, such as glass or plastic. The soluble base layer 131 is attached to the fixed portion 14 by a method such as adhesion or screw connection, and presses against the isolation assembly 133 to seal the through passage 142, thereby isolating the inside and the outside of the battery.

[0075] As shown in FIG. 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, and 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 by dissolving 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, so that the case opening 12 is opened, penetrating the inside and outside of the battery case 11, 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 6 This embodiment provides a battery case as a dissolution mechanism, and the material of the battery case is at least one of polypropylene glycol (PS), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), styrene-dimethylmethacrylate 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 above different materials have different dissolution rates in the electrolyte, the case material may be made of a single material or a multi-layer case made of two or more materials so as to meet the time requirement for the case to be dissolved by the electrolyte.

[0076] A number of single cells having the battery case of this embodiment are placed in the electrolyte chamber of the large-capacity battery. As the electrolyte chamber is filled with electrolyte, the battery case is gradually dissolved and disappears due to the electrolyte. Since the electrodes in the battery cases are in the common electrolyte chamber of the large-capacity battery, all the single cells are in a uniform electrolyte environment, which reduces or eliminates the difference between the batteries caused by different consumption of electrolyte during operation. Furthermore, after dissolution, the material of the case also acts as an electrolyte additive, which can remove moisture from the electrolyte and extend the service life of the battery. Example 7 As shown in FIGS. 8 and 9, this embodiment provides a battery case, in which a battery case 21 is provided with a case opening 24, and a 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 polymethylmethacrylate 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 so as to cover it. The areas of the polypropylene film and the polymethylmethacrylate 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 the movement of the dissolving mechanism 25 along the thickness direction, and the case opening 24 is sealed by the polymethylmethacrylate sheet covered with the polypropylene film.

[0077] During operation, the battery positive electrode 22 and battery negative electrode 23 of the single cell are each a current drawing terminal, and the single cells of the 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 away 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 inside 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 is provided with a circular case opening 24, the isolation assembly 252 is a sphere, the fixing part 26 is provided 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 be covered by the case opening 24, and the sphere seals the case opening 24 by being pressed by the polymethylmethacrylate, and the polymethylmethacrylate sheet and the fixing part 26 are fixed by a screw or engagement, and the material of the sphere may be glass or metal.

[0078] During operation, a number of single cells having the above-mentioned battery case are placed in the electrolyte chamber of the large-capacity battery, and the polymethylmethacrylate sheet gradually dissolves away due to contact with the external electrolyte. Since the spheres are not pressed by the polymethylmethacrylate sheet and 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 part 382, ​​the isolation assembly 36 is a polypropylene film having a thickness of 0.1 mm, the dissolving assembly 37 is a polymethylmethacrylate sheet having a thickness of 2 mm, and the polypropylene film is 3, the polymethylmethacrylate sheet covered with the polypropylene film is placed in the center hole of the base 35, and the surface with the polypropylene film faces the inside of the case, and an elastic member 381 and a fixing part 382 are provided on the outside of the polymethylmethacrylate sheet. In this embodiment, the elastic member 381 is a spring, the fixing part 382 has a center hole and a male screw that engages with the base 35, and the fixing part 382 and the base 35 are connected via the screw, so that the spring is in a pressed state, and the polymethylmethacrylate sheet covered with the polypropylene is used to seal the case opening 39.

[0079] The battery positive electrode 32 and the battery negative electrode 33 of the single cell are current drawing terminals, and the case of the single cell is the battery case 31 in this embodiment. When the single cell is in its natural state and does not come into contact with the external electrolyte, the isolation assembly 36 is a polypropylene film, which does not dissolve in the electrolyte, and the inside of the battery case 31 is isolated from the outside and sealed. When a number of single cells having the dissolving mechanism 34 are placed in the electrolyte chamber of the large-capacity battery, the polymethylmethacrylate sheet gradually dissolves and disappears due to contact with the external electrolyte, the spring is no longer pressed by the polymethylmethacrylate sheet, and under the elastic action of the spring, the polypropylene film is pushed up, the case opening 39 is no longer sealed, and the external electrolyte passes through the central hole of the fixing part 382 through the central hole of the base 35 and penetrates the opening of the battery case 31, so that the electrolyte can enter the inside of the battery chamber, and the electrolyte chamber of each single cell is in the same system as the electrolyte chamber of the large-capacity battery.

[0080] The spring in this embodiment may be another elastic member, such as an expandable barb-like member, which can achieve the same effect. In this embodiment, the base 35 is not provided, and the fixing part 382 may be directly bonded or welded to the case opening 39, and the pressing elastic member 381 is pressed by the fixing part 382. The connection method between the base 35 and the fixing part 382 in this embodiment may be another connection method, such as a fastening. Example 10 As shown in FIG. 15, this embodiment provides a battery case, and the battery case 41 is provided with a melting mechanism 42, and the melting mechanism 42 includes a base 421, a connecting pipe 422 protruding from the base 421, and a melting 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. There is a dissolving assembly 423 sealably attached within the connecting tube 422. In this embodiment, the dissolving assembly 423 is a polymethylmethacrylate sheet covered on one side with a polypropylene film, the polymethylmethacrylate sheet is 2 mm thick, the polypropylene film is 0.1 mm thick, and the polypropylene film covers the entire surface facing the inside of the polymethacrylate case. The dissolving 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 will come into contact with the polymethylmethacrylate sheet, and the polymethylmethacrylate sheet will be dissolved in the electrolyte and gradually disappear. After the polymethylmethacrylate disappears, under the action of the fluid, the polypropylene film will move and no longer seal the connecting tube 422, so that the inside and outside of the battery case 41 are penetrated, and the electrolyte will flow into the battery case 41 through the connecting tube 422. Example 11 As shown in FIG. 16 and FIG. 17, this embodiment provides a battery case, and the battery case 41 is provided with a melting mechanism 42. The melting mechanism 42 includes a base 421, a connecting pipe 422 protruding from the base 421, and a melting 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 hole diameter of the first hole 441 is larger than the hole 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 where the external thread is provided is 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 a screw, and the melting mechanism 42 is fixed to the battery case. In this embodiment, the melting assembly 423 is a polymethylmethacrylate sheet covered with a polypropylene film on one side, the polymethylmethacrylate sheet is 2 mm thick, the polypropylene film is 0.1 mm thick, and the polypropylene film is entirely covered on the surface facing the inside of the polymethacrylate case; a support 49 is provided in the connecting tube 422, the melting assembly 423 is placed on the support 49 and seals the through-hole 47; 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 and connected to the connecting tube 422; the connection method can be a screw connection, a fastening, or an adhesive, 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 mechanism 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 mechanism 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 FIG. 18 and FIG. 19, this embodiment provides a large-capacity battery including a plurality of parallel-connected single cells 412 and a multi-drop liquid storage pipe 411. The case of the single cells 412 is the battery case 41 in the embodiment 10 or 11. The multi-drop liquid storage pipe 411 includes a main pipe 4110 and a plurality of branch pipes 4111. The inner chamber of the main pipe 4110 is a liquid storage chamber 4112 for containing an electrolyte. The branch pipes 4111 and the connection pipes 422 of the single cells 412 are connected in a one-to-one correspondence. A dissolving assembly 423 is provided in the connection pipe 422. Therefore, when the electrolyte is injected into the multi-drop liquid storage pipe 411, the electrolyte is discharged from the multi-drop liquid storage pipe 411. The electrolyte enters each cell 412 through the main line 4110 and the branch pipe 4111. There is a dissolving assembly 423 in the connecting pipe 422 of the cell 412. 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 cell 412 and further into each battery. The electrolyte is contained in the electrolyte storage chamber 4112. The cell 412 and the electrolyte storage chamber 4112 are both in a common electrolyte system, which reduces the performance difference caused by the different electrolyte consumption of each battery, and the large-capacity battery has 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 is provided with a case opening 53, the dissolving mechanism 52 is provided on the outer surface of the case body 51, and the dissolving mechanism 52 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), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA). The isolating layer 522 is a metal plating layer on the inner surface of the dissolving layer 521, and the inner surface of the dissolving layer 521 is the surface of the dissolving layer 521 facing the inner chamber 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 and 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 material of the hot melt adhesive layer 55 is a modified polypropylene film. Since modified polypropylene does not dissolve in the electrolyte, in order to ensure that the case opening 53 and the inner chamber of the battery are penetrated after the dissolving layer 521 of the dissolving mechanism 52 is dissolved, the projection of the ring inner area CC of the metal ring 54 needs to cover the area AA of the case opening 53. 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, the projection of the inner ring area CC of the metal ring 54 covers the area AA of the case opening 53, an electromagnetic induction device is placed on the melting layer 521, the electromagnetic induction device is started to conduct electromagnetic induction to the metal ring 54, the metal ring 54 instantly generates heat, the modified polypropylene melts due to the heat, and the metal ring 54 is bonded and fixed to the case body 51 and the melting mechanism 52 by the melted modified polypropylene, thereby fixing the melting mechanism 52 to the case body 51.

[0086] The above-mentioned metal plating layer is a commonly used aluminum plating layer or copper plating layer, and a vacuum deposition process is used to form the metal plating layer on the surface of the dissolving layer 521. The thickness of the metal plating layer is 200 angstroms to 800 angstroms. The aluminum plating layer or copper plating isolation layer 522 does not dissolve in the electrolyte and has good brittleness, and the metal plating layer is very easy to break after the dissolving layer 521 dissolves, so it can be a good isolation layer 522 and can have air barrier effect and light shielding effect. It has been confirmed by experiments that these materials, polystyrene (PS), polymethyl acrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA), are gradually dissolved by the electrolyte after being immersed in the conventional electrolyte for a certain period of time. Since different materials have different dissolution times in the electrolyte, different materials can be selected as 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 single cells 510 having the above-mentioned battery case 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. Since the inner surface of the dissolving layer 521 has a metal plating layer, the dissolving layer 521 is not dissolved by the electrolyte inside the single cell 510. The dissolving layer 521 is gradually dissolved only by the electrolyte outside the single cell 510, i.e., the electrolyte inside the electrolyte chamber 59. After the dissolving layer 521 is dissolved by the electrolyte, the metal plating layer on the surface of the dissolving layer 521 has a thickness of only 200 angstroms to 800 angstroms. The dissolving layer 521 loses its support and bursts. As a result, the case opening 53 is opened. Under the fluid action of the electrolyte, the electrolyte inside the electrolyte chamber 59 flows into the inside of the battery case of the single cell 510, and the electrolyte between the inside and outside of the single cell 510 is realized.

[0088] In actual use, after a certain period of use, differences will occur due to different consumption of electrolyte among the single cells 510, which will result in differences in the performance of the single cells 510 and different battery consistency. A number of single 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 dissolving layer 521 of the case opening 53 dissolves, the electrolyte of the large-capacity battery will flow into the inside of the battery, and the electrolyte chambers of all the single cells 510 will be connected to the electrolyte chamber of the large-capacity battery. The electrolyte of all the single cells 510 will be in a uniform state, reducing the difference between the batteries, thereby improving the consistency and stability of each single 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, the case body 51 is provided with a case opening 53, the dissolving mechanism 52 is provided on the outer surface of the case body 51, and the dissolving mechanism 52 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 the material is 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, and the inner surface of the dissolving layer 521 is the surface of the dissolving layer 521 facing the inner chamber of the battery case. A filter film 56 is provided between the case body 51 and the dissolving mechanism 52, and there is a ring-shaped adhesive layer 57 on the upper and lower surfaces of the filter film 56, that is, the ring-shaped adhesive layer 57 is located at the contact surface between the filter film 56 and the case body 51 and the dissolving mechanism 52, and the material of the ring-shaped adhesive layer 57 is one of epoxy resin adhesive, modified polypropylene / polyethylene, and tab adhesive, so that the ring-shaped adhesive layer 57 is not dissolved in the electrolyte, so as to ensure that after the dissolving layer 521 is dissolved by the electrolyte, the electrolyte flows into the case opening 53 through the filter film 56, the projection of the ring-shaped adhesive layer 57 in the ring inner area DD covers the area AA of the case opening 53, and 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 an adhesive method or a welding method.

[0090] In this embodiment, the metal plating layer on the surface of the dissolving layer 521 may be nickel or zinc plating in addition to the aluminum plating layer or copper plating layer, and may be formed on the surface of the dissolving layer 521 by using a vacuum deposition process, or may be electroplating, electroless plating, electroless plating, or other plating processes, and 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 can easily imagine that the filter film 56 can be fixed between the case body 51 and the dissolving mechanism 52 by using an adhesive method, or by using a welding process such as ultrasonic welding, vibration welding, and heat welding.

[0091] As shown in FIG. 25, a plurality of single cells 510 having the above-mentioned battery case 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. Since the inner surface of the dissolving layer 521 has a metal plating layer, the dissolving layer 521 is not dissolved by the electrolyte inside the single cell 510. The dissolving layer 521 is gradually dissolved only by the electrolyte outside the single cell 510, i.e., the electrolyte inside the electrolyte chamber 59. After the dissolving layer 521 is dissolved by the electrolyte, the metal plating layer on the surface of the dissolving layer 521 has a thickness of only 200 angstroms to 800 angstroms. The dissolving layer 521 loses its support and bursts. As a result, the case opening 53 is opened. Under the fluid action of the electrolyte, the electrolyte flows into the inside of the case of the single cell 510, and the penetration between the inside and outside of the single cell 510 is realized. Example 15 As shown in Fig. 24, this embodiment provides a single battery, and the battery case of the single battery 510 is the battery case of Example 13 or Example 14, an electrode assembly and an electrolyte are accommodated in the battery case, a battery positive electrode 511 and a battery negative electrode 512 are current drawing terminals of the single battery 510, a case opening 53 is provided on the bottom surface of the battery case, and a dissolving mechanism 52 is provided in the case opening 53. In order to meet the requirements of use, the case opening 53 may be provided at any position of the battery case, and may be located on the upper end surface, side surface or bottom surface of the case, one or more case openings 53 may be provided in the battery case, and only one case opening 53 may be provided with the dissolving mechanism 52, or multiple case openings 53 may be provided with the dissolving mechanism 52.

[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 single 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 single cells 510 are placed in the electrolyte chamber 59, a case opening 53 is provided in a battery case of the single cells 510, and a dissolving mechanism 52 is provided in the case opening 53, so that the case opening 53 is immersed in the electrolyte, and a dissolving layer 521 has an inner surface with a metal plating layer, so that the dissolving layer 521 dissolves in the electrolyte inside the single cells 510. Instead, the dissolving layer 521 is dissolved only by the electrolyte outside the cell 510, i.e., the electrolyte in the electrolyte chamber 59. After the dissolving layer 521 is dissolved by the electrolyte, the thickness of the metal plating layer on the surface of the dissolving layer 521 is only 200 angstroms to 800 angstroms, and the dissolving layer 521 loses its support and bursts, thereby opening the case opening 53, and under the fluid action of the electrolyte, the electrolyte flows into the inside of the case of the cell 510, thereby realizing penetration between the inside and outside of the cell 510. Example 16 As shown in Figures 26 and 27, this embodiment provides a battery case, in which the battery case 61 is provided with a protrusion 62 facing the outside of the battery, the protrusion 62 has a central through-hole 621 through which the inner chamber of the battery and the outside of the battery pass, the protrusion 62 is provided with a dissolving mechanism 63, the dissolving mechanism 63 is provided with a cap 631 and a dissolving sheet 632, the cap 631 is provided with a through-hole 6311 which is provided corresponding to the central through-hole 621, the dissolving sheet 632 is provided between the cap 631 and the protrusion 62, the dissolving sheet 632 is of a size sufficient to cover the central through-hole 621, and the dissolving sheet 632 is fixed to the protrusion 62 by the cap 631, so that the central through-hole 621 of the protrusion 62 can be sealed by the dissolving mechanism 63. The material of the dissolving sheet 632 can be selected and manufactured from a material that can be dissolved in the electrolyte, and preferably, is manufactured from a material that can be sufficiently dissolved in the electrolyte and does not contaminate the electrolyte. Experiments have confirmed that polystyrene (PS), polymethylmethacrylate (PMMA), thermoplastic polyurethane elastomer (TPU), polyacrylate resin copolymer (SMMA), and engineering plastic (ASA) dissolve well in the electrolyte and do not contaminate the electrolyte, and polymethylmethacrylate (PMMA) is a preferred material because it can play a role of improving the battery performance as an electrolyte additive after dissolving in the electrolyte. The thickness of the dissolving sheet 632 is also one of the relatively important parameters, and the thicker the dissolving sheet 632, the longer the dissolving time in the electrolyte. In order to ensure that the dissolving time of the dissolving sheet 632 after immersing each cell 64 in the electrolyte can meet the design requirements, the thickness of the dissolving sheet 632 is preferably less than 2 mm.

[0093] As shown in FIG. 28, in the process of manufacturing a large-capacity battery, a single cell 64 having the above-mentioned battery case 61 is placed in a large-capacity battery case 65 containing an electrolyte, and the electrolyte is injected into the large-capacity battery case 65 through the electrolyte inlet 67, filling the electrolyte chamber 66 of the large-capacity battery with the electrolyte, passing through the through hole 6311 of the cap 631 and contacting the dissolving sheet 632, which is gradually dissolved by the electrolyte, and after a part or all of the dissolving sheet 632 is 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 single cell 64 are fused with each other, thereby achieving the purpose of making the electrolyte inside each single cell 64 be 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 good sealing effect and is easy to operate. In some other embodiments, the protrusion 62 is provided with an outer edge, a male thread is provided on the outer edge, and the cap 631 is provided with an internal thread matching the male thread, the cap 631 and the protrusion 62 are connected and fixed by a screw, and the central through-hole 621 is sealed by the soluble sheet 632, which has good sealing effect but requires additional processing of the screw on the protrusion 62 and the cap 631, so the structure is relatively complicated compared with 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 does not dissolve in the electrolyte is plated on the surface of the dissolving sheet 632 facing the inner chamber 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 in the inner chamber of the battery, which is different from Example 16. The thickness of the metal plating layer 6321 is 20nm to 80nm. If the metal plating layer 6321 is too thin, it is likely to burst during plating. If the metal plating layer 6321 is too thick, it is unlikely to burst after the dissolving sheet 632 is dissolved, and the purpose of allowing the electrolyte outside the battery to reach the inside of the battery cannot be achieved. Experiments have confirmed that when the thickness of the metal plating layer 6321 is 20nm to 80nm, it can well serve as an isolation layer to isolate the electrolyte inside the battery from contact with the dissolving sheet 632. In addition, when the dissolving sheet 632 is dissolved by the electrolyte, the metal plating layer 6321 bursts, and the electrolyte in the large-capacity battery case 65 and the electrolyte in the inner chamber of each unit cell 64 fuse with each other, thereby achieving the purpose of making the electrolyte inside each unit cell 64 into the same 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 embodiment is different from Example 17 in that, in addition to Example 17, a protective layer 6323 for protecting metal plating layer 6321 is added. Metal plating layer 6321 has a thickness of only 20 nm to 80 nm, and is highly brittle, so that metal plating layer 6321 is likely 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 the function of sealing central through-hole 621. Therefore, in order to prevent the metal plating layer 6321 from bursting when the dissolving sheet 632 is not dissolved and losing its function of isolating the dissolving 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 two-component epoxy resin, adding a diluent to reduce the viscosity, and blade coating it. It can also be made by mixing a paste of one or more of polytetrafluoroethylene, polyvinylidene fluoride, styrene-butadiene rubber, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, carboxyethyl cellulose, polyvinyl alcohol, etc., and a solvent (e.g., N-methylpyrrolidone, tetrahydrofuran, alcohols) and applying it. The protective layer 6323 can protect the metal plating layer 6321 to prevent the metal plating layer 6321 from unexpectedly bursting during manufacture or use. Furthermore, when the dissolving sheet 632 is dissolved by the external electrolyte, the metal plating layer 6321 and the protective layer 6323, which have lost their carrier, will both burst, and the central through-hole 621 will no longer be sealed, and the through-hole 6311 and the central through-hole 621 will penetrate, allowing the electrolyte in the large-capacity battery case 65 to flow into the inner chamber of the single cell 64, thereby achieving the purpose of making the electrolyte in each single cell 64 into the same electrolyte system.The thickness of protective layer 6323 is preferably 0.1 μm to 10 μm. If the thickness of protective layer 6323 is too small, it cannot fulfill its role of protecting metal plating layer 6321, and if the thickness of protective layer 6323 is too large, it cannot burst in association with the rupture of metal plating layer 6321 and prevents electrolyte outside the battery from entering the inside of the battery. Through multiple experiments, it has been confirmed that when the thickness of protective layer 6323 is 0.1 μm to 10 μm, protective layer 6323 can not only fulfill its role of protecting the plating layer, but also burst in association with the rupture of metal plating layer 6321.

[0096] In this embodiment, the method for manufacturing the protective layer 6323 is as follows.

[0097] A commercially available epoxy resin (HASUNCAST brand), model number: 129 (A / B), was purchased. This epoxy resin is an A / B gel two-component epoxy resin. Component A is an epoxy resin with epoxy groups, and component B is a hardener. If only components A and B are mixed, the viscosity is high, which is disadvantageous for forming a protective film of the required thickness, so a diluent must be added. The diluent component is an epoxy resin monomer.

[0098] Preparation method: If there is no precipitate in the pre-mixed A gel, mix component A and component B in a mass ratio of 100:12, add 20 g of diluent (model number: 669, manufacturer: Changzhou Runxiang Chemical Co., Ltd.), stir for 3 to 5 minutes, and after mixing, the A, B and diluent are homogenized. Then, drop it onto the surface of the aluminum-plated polymethyl methacrylate, and use a wire bar to uniformly blade coat the surface of the metal plating layer 6321, and leave it to harden.

[0099] In some embodiments, in order to prevent impurities and fragments of the metal plating layer 6321 and the protective layer 6323 from flowing into the inner chamber of the battery after rupture, contaminating the electrolyte and affecting the battery performance, a filter membrane 6322 is provided between the protective layer 6323 and the protrusion 62, or a filter membrane 6322 is provided inside the inner chamber of the battery case. When the external electrolyte flows into the inner chamber of the battery through the through hole 6311 and the central through hole 621, the filter membrane 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 membrane 6322 is one of polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP) and filter paper, and the thickness of the filter membrane 6322 is 0.1um to 30um. 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 feature 63 and the protrusion 62 to improve the sealing of the connection between the fusing feature 63 and the protrusion 62 . (Example 19) 29 to 31, this embodiment provides a battery case, and the battery case 79 is applied 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, and when the opening is opened, liquid outside the soft-packaged battery can enter the soft-packaged battery through the opening.

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

[0102] When a soft package battery having the clamp member 71 is placed in an electrolyte, the clamp member 71 is immersed in the electrolyte and is dissolved by the electrolyte, thereby losing the clamping force on the opening portion 710, opening portion 710 is opened, and the external electrolyte can enter the inside of the battery through the opening portion 710. The opening portion 710 is sealed using the dissolving mechanism, and the structure is simple, and the dissolving mechanism is automatically dissolved by the electrolyte when immersed in the electrolyte to open the opening portion 710, so that the opening can be opened without requiring any external mechanical operation, making it easy to use. (Example 20) As shown in FIG. 32 , this embodiment provides a battery case, the battery case 79 is applied to a soft package battery 711, the battery case 79 is provided with a dissolving mechanism, the dissolving mechanism includes a first clamp plate 73, a second clamp plate 74, and several bolts 75, the first clamp plate 73 and the second clamp plate 74 have several through holes, in use, the opening 710 is placed between the first clamp plate 73 and the second clamp plate 74, the bolts 75 pass through the through holes to connect the first clamp plate 73 and the second clamp plate 74 and sealably clamp the opening 710, a gasket 76 is provided between the first clamp plate 73 and the opening 710 and / or between the second clamp plate 74 and the opening 710, preferably only one gasket 76 is provided, which not only saves costs but also achieves a sealing effect. The material of the rivet is one of materials dissolvable in the electrolyte, such as polymethylmethacrylate, 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 package battery 711 having the dissolving mechanism is placed in the electrolyte, the dissolving mechanism is immersed in the electrolyte, and the rivet is dissolved by the electrolyte and disappears, thereby losing the clamping force on the opening portion 710, the opening portion 710 is opened, and the electrolyte outside the battery case 79 enters the inside of the battery case 79 through the opening portion 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 soluble in the electrolyte. When the soft-packaged battery 711 having the 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 the sealing effect on the opening 710, the opening 710 is opened, and the external electrolyte enters the inside of the soft-packaged battery 711 through the opening 710. When the first clamp plate 73, the second clamp plate 74, and the rivet are all made of a material that is soluble in the electrolyte, the soft-packaged battery 711 can be opened more quickly. Those skilled in the art can easily imagine that 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 soluble in the electrolyte according to different opening speeds required to open the opening of the soft-packaged battery 711.

[0104] 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 automatically dissolved by the electrolyte to open the opening 710, so that 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 uneven engagement parts or other engagement parts 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 may also be rivets, making it easier to connect and fix. Example 21 As shown in Fig. 33 and Fig. 34, this embodiment provides a battery case, the battery case 79 is applied to a soft package battery, the battery case 79 is provided with a dissolving mechanism, the dissolving mechanism 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 placed 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. In order 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, or 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 can be dissolved in the electrolyte, which is one of polymethylmethacrylate, silicone rubber polyvinyl chloride, polycarbonate or ABS plastic, and these materials can be dissolved by the electrolyte when immersed in the electrolyte. Therefore, when the soft package battery with 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, the opening 710 is opened, and the external electrolyte enters the inside of the soft package 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, so that the opening 710 can be opened more quickly and easily. In this way, when the 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, so that the dissolving mechanism loses its sealing effect on the soft-packaged battery, the opening 710 is opened, and the external electrolyte enters 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 can be dissolved 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 can be a C-shaped hollow tube that matches the shape of the outer clip 77, or a solid circular tube. Those skilled in the art can imagine that the cross-sectional shape of the outer clip 77 can not only be a C-shaped hollow tube, but also a hollow tubular structure with a square or trapezoidal cross-section, and the inner support 78 can match the hollow shape of the outer clip 77 to provide a support force to press the opening 710, thereby sealing the opening 710.

[0109] The opening 710 is sealed using the dissolving mechanism, and the structure is simple. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so that the opening can be opened without requiring any external mechanical operation, and the structure is easy to use. Example 22 As shown in Figs. 35 and 36, this embodiment 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 is provided with 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 the other side of the battery case 79. For example, the opening 710 is located on a side opposite to the side on which the positive electrode tab 712 and the negative electrode tab 713 are located, or on a 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 a side opposite to the battery case 79, the opening 710 is located on a 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 the opening 710 is 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, the opening 710 is opened, and the external electrolyte enters the inside of the soft-packaged battery through the opening 710.

[0111] The opening 710 is sealed using the dissolving mechanism, and the structure is simple. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so that the opening can be opened without requiring any external mechanical operation, and the structure is 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 soft-packaged batteries 711 as described in Example 22. A plurality of soft-packaged batteries 711 are connected in parallel and then accommodated in a large-capacity battery case 79 to form a large-capacity battery. The dissolution mechanism as described in Examples 20 to 21 is attached to the opening 710, the outer case 714 is sealed by the cover plate 715, and an electrolyte is filled in the outer case 714. Therefore, the opening 710 is immersed in the electrolyte, and a 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 inside of the soft-packaged battery 711 through the opening 710. Therefore, all the soft-packaged batteries 711 are in a unified electrolyte system, thereby reducing or eliminating the problem of poor cycle performance of the large-capacity battery due to performance differences of a single soft-packaged battery 711 caused by electrolyte consumption differences during the operation of the large-capacity battery.

[0112] The opening 710 is sealed using the dissolving mechanism, and the structure is simple. When the dissolving mechanism is immersed in an electrolyte, it is dissolved by the electrolyte to open the opening 710, so that the opening can be opened without requiring any external mechanical operation, and the structure is easy to use. (Example 24) As shown in FIG. 38, this embodiment provides a battery case, and the battery case is a dissolving mechanism. In this case, the battery case 81 includes a body layer 811, and the body layer 811 has an inner surface 8110 and an outer surface 8111. The inner surface 8110 is a surface facing the battery case inner chamber, and the outer surface 8111 is a surface away from the battery case inner chamber, that is, a surface facing the outside of the case. The inner surface 8110 of the body layer 811 is sequentially provided with an adhesive layer 812 and a heat seal layer 814, and the adhesive layer 812 is a waterproof adhesive layer 812, and 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 body layer 811 by the adhesive. The material of the heat seal layer 814 is a composite material layer, and the material is made of polypropylene (CPP) and nylon PA6 hot melted, and 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 an 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 porous aluminum foil holes may be circular or rectangular, and are preferably circular, the circular hole diameter is preferably 0.5 mm to 1 mm, and the thickness is preferably 40 to 100 μm, so that the electrolyte can 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. 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% hardener, 0.5% tackifier resin, 0.2% hydrolysis inhibitor, 58.8% cyclohexane, and 29% butyl ketone, of which cyclohexane and butyl ketone are used as solvents. The hardener is tert-butylperoxyhexane or an imidazole-based compound, the tackifier resin is a phenolic resin or a modified rosin resin, and the hydrolysis inhibitor is a carbodiimide, an oxazoline, and an 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 hardener are added in sequence while stirring, so that the total solid content of the adhesive is 10%, and the adhesive is filtered using a polypropylene (PP) filter element to remove insoluble matter and is ready for use.

[0119] The manufacturing method of the heat seal layer 814 is as follows: CPP and PA6 are mixed uniformly according to a mass ratio of 2:1, heated to 250°C, stirred while heating, and uniformly stirred, the already melted plastic is sandwiched between two rollers, rolled into a film, and then stretched to make it stronger, with a thickness of 10-30 μm, and cooled at room temperature. Since CPP is not soluble in the electrolyte and PA6 is easily soluble in the electrolyte, the speed at which the heat seal layer 814 formed by hot melt dissolves in the electrolyte is slower than the speed at which PA6 dissolves in the electrolyte, and the dissolution time of the dissolution layer can be adjusted by adjusting the compounding ratio of CPP and PA6.

[0120] In this embodiment, the mass blending ratio of CPP and Nylon PA6 in the heat seal layer 814 is not unique. Since 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, and therefore the ratio of CPP and Nylon PA6 can be adjusted according to the time required to dissolve the electrolyte.

[0121] The manufacturing method of the battery case is as follows. 1. Drying of adhesive: The manufactured adhesive is dried in a vacuum drying box under nitrogen environment conditions at 60°C to 80°C for 24 hours. 2. Degreasing treatment for porous aluminum foil: The porous aluminum foil is immersed in a degreasing solvent at room temperature to perform degreasing for 2 hours. The degreasing solvent is one of acetone, butyl ketone, and trichloroethylene. 3. Bonding of porous aluminum foil layer and protective layer 813: The aluminum foil layer after degreasing treatment and the adhesive after drying are combined, and the adhesive layer 812 is bonded to the outer surface 8111 of the porous aluminum foil layer. After the combination, aging is performed, and the protective layer 813 is bonded to the outer surface 8111 of the porous aluminum foil by a roll coating method. 4. Bonding of the porous aluminum foil layer and the heat seal layer 814: Apply adhesive to the inner surface 8110 of the heat seal layer 814, control the thickness of the applied adhesive to 3 μm, and dry in an oven, then heat-press the adhesive-applied surface of the heat seal layer 814 and the aluminum foil to combine, and bond to the porous aluminum foil inner surface 8110, the oven temperature is 85°C, and the application amount of the dried rubber is 2.4 g / m2. 5. Molding of the battery case: The battery case after the combination is placed in an aging chamber and aged for 5 days, and the aging temperature is 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 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] Since the protective layer 813 and the heat-sealing layer 814 are thin and the materials are not hard, the 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 FIG. 41 , a plurality of single cells 84 having the battery case of this embodiment are placed in an outer case 85, and an electrolyte is filled into an electrolyte chamber 86 of the large-capacity battery. The case protective layer 813 and heat seal layer 814 of the single cells 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 body layer 811 remains in the case of the single cells 84. Since the main body layer 811 is a porous aluminum foil, the electrolyte can penetrate the porous aluminum foil. Therefore, the electrode assemblies 87 of all the single cells 84 are immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no consistency difference in the electrolyte of the single cells 84, which further improves the performance of the large-capacity battery. (Example 25) As shown in Figure 39, an adhesive layer 812, a protective layer 813 and a heat seal layer 814 are sequentially provided on an inner surface 8110 of a main body layer 811 in this embodiment. In other words, the difference between this embodiment and Example 24 is that a protective layer 813 is added between the adhesive layer 812 and the heat seal layer 814 in Example 24.

[0125] In this embodiment, the main body layer 811 is a porous aluminum foil, and the porous aluminum foil holes may be circular or rectangular, preferably circular, with a circular hole 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 case inner chamber and an outer surface 8111 facing away from the case inner chamber. 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. The adhesive layer 812 is a waterproof adhesive layer 812, and its material is 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, and its material is hot-melt polypropylene (CPP) and nylon PA6, and the heat seal layer 814 has a thickness of 10 μm. An adhesive layer 812 and a protective layer 813 are provided on an 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 composition and manufacturing method are the same as those in Example 24.

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

[0128] Both the heat seal 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 when the battery case 81 is 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, and because the heat seal layer 814 is thin, it serves to support the body layer 811 to prevent the battery case from being damaged under the action of external forces, and also increases the dissolution time of the battery case in the electrolyte.

[0129] As shown in FIG. 41, a plurality of single 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 the heat seal layer 814 of the case of the single cells 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 disappeared, only the main layer 811 remains in the case of the single cells 84. Since the main layer 811 is a porous aluminum foil, the electrolyte in the electrolyte chamber can pass through the porous aluminum foil. The electrode assemblies 87 of all the single cells 84 are all immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no consistency difference in the electrolyte of the single cells 84, which further improves the performance of the large-capacity battery. (Example 26) As shown in Fig. 40, this embodiment provides a single cell, and the single cell 84 is a soft package 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, and an electrolyte is accommodated in the battery case 81. When the single cell 84 having the battery case of this embodiment is placed in the electrolyte chamber of a large-capacity battery, it can dissolve in the electrolyte by itself, without requiring mechanical operation, and the case has a simple structure and is highly versatile.

[0130] A plurality of single 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 the single 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 single cell 84. Since the main layer 811 is made of porous aluminum foil, the electrode assemblies 87 of all the single cells 84 are immersed in the electrolyte chamber of the large-capacity battery and are in the same electrolyte system. Therefore, there is no consistency difference in the electrolyte of the single cells 84, which further improves the performance of the large-capacity battery. Example 27 As shown in Figs. 42 to 44, this embodiment provides a plastic case battery including a battery case 910, a plurality of soft package cells 91, an upper cover assembly 92, a positive pole 96, a negative pole 98, a burst relief valve 93, and a conductive connection sheet 95. A plurality of soft package cells 91 are accommodated in the battery case 910, and an opening 917 is provided in the soft package cell 91. The positive electrode tab 94 and the negative electrode tab 95 of the soft package cell 91 are connected to the positive electrode pole 96 and the negative electrode pole 98 of the upper cover assembly 92 via the conductive connection sheet 95. The upper cover assembly 92 seals the battery case 910, and the upper side of the battery case 910 has one case opening 911, and the case opening 911 is provided with a dissolving mechanism 913. In this embodiment, the dissolving mechanism 913 is a polymethylmethacrylate sheet having a thickness of 2 mm, which 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 a good yield are selected, holes are drilled in the aluminum plastic film of the soft package cells 91, the soft package cells 91 are connected in parallel, and sealed in a plastic case to manufacture a plastic case battery. When the battery is in its natural state, the inner chamber of the battery case 910 is sealed and isolated from the outside, and 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, and since there is an opening in the aluminum plastic film of the soft package cell 91, the electrolyte further 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 polymethylmethacrylate sheet, and the polyethylene film can cover the case opening 911, and the polyethylene film is attached to the surface of the polymethylmethacrylate 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 inner chamber 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 polymethylmethacrylate 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, and 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 can further flow into the inside of the soft package cell 91, so that multiple soft package cells 91 are in the same electrolyte system. (Example 28) As shown in FIG. 45, this embodiment provides a plastic case battery, which differs from embodiment 27 in that a case opening 911 is provided in a battery case 910, abutment tube 912 is provided in the case opening 911, the abutment tube 912 and the case opening 911 are fixed by adhesion, and the abutment tube 912 is connected to the inner chamber of the battery case 910, and in this embodiment, the dissolving mechanism 913 is a polymethylmethacrylate sheet having a thickness of 2.5 mm, which is fixed and adhered within the abutment 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 polymethylmethacrylate sheet, the polyethylene film can cover the case opening 911, and the polyethylene film is attached to cover one side of the polymethylmethacrylate 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 polymethylmethacrylate is attached to the inside of the case so that one side of the polyethylene film is covered, 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. 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. A dissolving mechanism 913 is provided in the case opening 911. The dissolving mechanism 913 in this embodiment is a polymethyl methacrylate sheet having a thickness of 2 mm, which is sealed and bonded to the case opening 911. When electrolyte is injected into the multi-drop liquid storage pipeline through the liquid injection gas vent 918, the electrolyte is injected into the main pipeline 914 and the branch pipes 915. The electrolyte enters each plastic case battery 916 through a tube 915, and there is a polymethyl methacrylate dissolving sheet at the opening of the plastic case battery 916. After the dissolving sheet is dissolved by the electrolyte and disappears, the electrolyte in the tube and the plastic case battery 916 penetrate each other, and the electrolyte enters the plastic case battery 916 and then into each soft package cell 91, and the electrolyte is contained in the reservoir chamber. Therefore, the plastic case battery 916 to which the soft package cell 91 is attached and the reservoir chamber are both in a common electrolyte system, which reduces the problem of battery performance differences caused by different electrolyte consumption during battery use, and the large-capacity battery has good uniformity.

[0135] Since the soft package cells 91 in the plastic case battery 916 all go through chemical component capacity grading and consistency screening before being sealed into the battery case, the whole large capacity battery further has good consistency.

Claims

1. A battery case having a dissolving mechanism that allows at least a portion of the battery case to be dissolved in an electrolyte.

2. The battery case of claim 1, characterized in that 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 comes into contact with an electrolyte, the dissolution base layer is dissolved, the case opening is opened, and the interior of the battery case is penetrated to the outside.

3. The battery case according to claim 2, 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, polydodecane amide, polyamide, imide PAI, styrene-butadiene copolymer, and polystyrene, and polydodecane amide and polyamide are preferable.

4. The battery case of claim 2, wherein the dissolution mechanism further includes an isolation layer attached to an inner surface of the dissolution base layer, the inner surface of the dissolution base layer being the surface facing the interior of the battery case.

5. 5. The battery case according to claim 4, wherein the separator is a film that is insoluble in an electrolyte.

6. 5. The battery case of claim 4, wherein the isolation layer is an isolation coating layer applied to the inner surface of the dissolution base layer, the isolation 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, the solvent is at least one of N-methylpyrrolidone, N,N-dimethylformamide, N,N-diethylformamide, dimethylsulfoxy, tetrahydrofuran, and water or alcohols, and the isolation layer adheres the dissolution base layer to the case opening.

7. The battery case according to any one of claims 2 to 6, characterized in that a fixing portion is provided on the outside of the case opening in order to fix the dissolution mechanism, the fixing portion is provided with a through passage communicating with the interior of the battery case, and the dissolution mechanism is provided inside the fixing portion to seal the through passage.

8. 8. The battery case according to claim 7, further comprising a support provided within the through passage for placing the dissolving mechanism.

9. The battery case according to claim 1, characterized in that 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.

10. 2. The battery case according to claim 1, wherein the dissolving mechanism includes an isolation assembly and a dissolving assembly, the battery case is provided with 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 interior, the isolation assembly is pressed by the dissolving assembly to seal the case opening together, and when the dissolving assembly comes into contact with an electrolyte outside the battery case, the isolation assembly is opened by dissolving the dissolving mechanism, penetrating the inside and the outside of the battery case.

11. The battery case of claim 10, wherein the isolation assembly is a sphere or a cone.

12. 2. The battery case according to claim 1, wherein the dissolving mechanism includes an isolation assembly, a dissolving assembly, and a push-up assembly, the battery case has at least one case opening, the isolation assembly, the dissolving assembly, and the push-up assembly are sequentially provided in a direction away from the battery case of the case opening, the isolation assembly and the dissolving assembly together seal the case opening, and the push-up assembly is maintained in a pressed state by the dissolving assembly, and when the dissolving assembly comes into contact with an electrolyte, the dissolving assembly dissolves to release the push-up assembly from the pressed state, the isolation assembly is pushed up, and the inside and outside of the battery case are penetrated.

13. The battery case according to claim 12, wherein the push-up assembly includes a fixing portion and a resilient member, the resilient member being a spring, and the fixing portion and dissolving assembly cause the spring to be in a compressed state.

14. The battery case according to claim 1, characterized in that the battery case is provided with an attachment portion having a through-hole, the dissolving mechanism includes a base, a connecting tube protruding from the base, and a dissolving assembly, the base is provided with a through-hole penetrating the connecting tube, the dissolving assembly is provided within the connecting tube, the connecting tube is sealed by the dissolving assembly, the connecting tube 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, and the electrolyte enters the inside of the battery case.

15. The battery case of claim 14, characterized in that 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 hole diameter of the first hole is larger than the hole diameter of the second hole, the base is drilled into the first hole, and the connecting tube is drilled into the second hole.

16. The battery case of claim 14, characterized in that the dissolving mechanism further includes a nut, a gasket and a sealing ring, the connecting tube has an external thread that matches the nut, the nut is provided outside the battery case and is connected to the external thread of the connecting tube, the gasket is provided between the mounting portion and the nut, and the sealing ring is provided between the base and the mounting portion.

17. The battery case according to claim 14, characterized in that the dissolving assembly includes a dissolvable sheet that is soluble in an electrolyte and a protective film that is not soluble in an electrolyte, the protective film being provided on a surface of the dissolvable sheet that faces the inside of the battery case to seal and isolate the battery case.

18. The battery case according to claim 17, characterized in that the melting mechanism further includes a pressing member that presses and fixes the melting assembly, the inside of the pressing member being hollow and penetrating the connecting pipe and tightly connected to the connecting pipe.

19. 2. The battery case according to claim 1, characterized in that a case body of the battery case has a case opening, the dissolution mechanism is provided on an outer surface of the case body and covers the case opening, the dissolution mechanism includes a dissolution layer and an isolation layer, the dissolution layer is dissolvable in an electrolyte, the isolation layer is a metal plating layer on an inner surface of the dissolution layer, and the inner surface of the dissolution layer is a surface of the dissolution layer facing the inner chamber of the battery case.

20. The battery case according to claim 19, characterized in that the metal plating layer is an aluminum plating layer or a copper plating layer, the thickness of the metal plating layer is 200 angstroms to 800 angstroms, a metal ring is provided between the case body and the dissolving mechanism, a projection of an inner area of ​​the metal ring covers the case opening area, and a hot melt adhesive layer is provided between the metal ring, the dissolving mechanism, and the case body.

21. The battery case according to claim 20, characterized in that a single-layer or multi-layer filter membrane is provided between the case body and the dissolution mechanism, the filter membrane covers the case opening, and after the dissolution mechanism dissolves, the electrolyte outside the battery case passes through the filter membrane and enters the inner chamber of the battery case.

22. The battery case described in claim 21, characterized in that a ring-shaped adhesive layer is provided between the filter membrane, the case body, and the dissolution mechanism, the filter membrane, the case body, and the dissolution mechanism are adhered and fixed by the ring-shaped adhesive layer, and a projection of the inner area of ​​the ring of the ring-shaped adhesive layer covers the case opening area.

23. 2. The battery case according to claim 1, characterized in that 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 an electrolyte.

24. The battery case according to claim 23, characterized in that the surface of the soluble sheet facing the inner chamber of the battery case is coated with a metal plating layer that is insoluble in an electrolyte, and a protective layer is coated on the surface of the metal plating layer.

25. 25. The battery case according to claim 24, further comprising a filter membrane disposed in the central through hole and positioned on a side of the protective layer closer to the inside of the battery case.

26. 2. The battery case according to claim 1, wherein the dissolving mechanism is clamped to an opening portion of the battery case so that the opening portion of the battery case can be opened after the single battery is immersed in the electrolyte, and at least a portion of the dissolving mechanism is dissolvable in the electrolyte.

27. The battery case described in claim 26, characterized in that 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 portion of the battery case by its own elastic restoring force.

28. 27. The battery case of claim 26, wherein the dissolving mechanism includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate together applying a clamping force to an opening portion of the battery case to achieve sealing.

29. 29. The battery case according to claim 28, wherein the first clamping plate and the second clamping plate are fixed together by a riveting or bolting method, and the rivets or bolts are made of a material that is soluble in the electrolyte.

30. The battery case of claim 26, characterized in that 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 disposed within the outer clip, and the inner support and the outer clip together clamp the opening portion of the soft package battery case.

31. 2. The battery case according to claim 1, characterized in that 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, the outer surface is a surface away from the battery case interior, the main body layer is a porous metal foil layer, and is used to communicate between the inside and outside of the battery case, and the adhesive layer and the protective layer are dissolvable in the electrolyte.

32. 32. The battery case according to claim 31, further comprising a protective layer that dissolves in an electrolyte between the adhesive layer and the heat seal layer.

33. The battery case according to claim 31, characterized in that the main body layer is a single-layer or multi-layer porous metal foil, the porous metal foil holes are circular and have a hole diameter of 0.5 mm to 1 mm, the protective layer is a nylon PA6 protective layer, the protective layer 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 body layer and the protective layer / heat seal layer, and the heat seal layer is a composite layer made of a hot melt mixture of polypropylene (CPP) and nylon PA6.

34. A single battery, characterized in that the case is the battery case according to any one of claims 1 to 33.

35. 35. The battery according to claim 34, wherein the battery case is sealed by an upper cover assembly, at least one soft package cell is provided therein, an opening is provided in an encapsulation bag of the soft package cell, 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.

36. A large-capacity battery comprising at least two of the single cells according to claim 34 and a multi-drop liquid storage pipeline including a main pipeline and at least two branch pipes, 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.

37. 35. A large-capacity battery comprising an outer case and a plurality of the unit cells according to claim 34, the outer case having an electrolyte chamber filled with an electrolyte, the unit cells being housed within the electrolyte chamber.

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