CN220382167U - Battery case and battery with same - Google Patents
Battery case and battery with same Download PDFInfo
- Publication number
- CN220382167U CN220382167U CN202321831252.XU CN202321831252U CN220382167U CN 220382167 U CN220382167 U CN 220382167U CN 202321831252 U CN202321831252 U CN 202321831252U CN 220382167 U CN220382167 U CN 220382167U
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- Prior art keywords
- lithium
- supplementing
- battery
- lithium supplementing
- piece
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 284
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 281
- 230000001502 supplementing effect Effects 0.000 claims abstract description 189
- 239000003792 electrolyte Substances 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims description 24
- 239000013589 supplement Substances 0.000 claims description 17
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 8
- 150000002500 ions Chemical class 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229920001721 polyimide Polymers 0.000 claims description 6
- 239000009719 polyimide resin Substances 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 claims description 4
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001947 lithium oxide Inorganic materials 0.000 claims description 4
- HPGPEWYJWRWDTP-UHFFFAOYSA-N lithium peroxide Chemical compound [Li+].[Li+].[O-][O-] HPGPEWYJWRWDTP-UHFFFAOYSA-N 0.000 claims description 4
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 27
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 230000002427 irreversible effect Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 230000003020 moisturizing effect Effects 0.000 description 24
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000011148 porous material Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 230000005484 gravity Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007772 electrode material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000006138 lithiation reaction Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 230000009087 cell motility Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Abstract
The embodiment provides a battery case and have its battery, includes: a base shell and a lithium supplementing structure; wherein, the base shell is suitable for being sleeved outside the battery core; the lithium supplementing structure is arranged between the base shell and the battery cell and is suitable for being contacted with battery electrolyte; the lithium supplementing structure comprises a lithium supplementing piece and a lithium supplementing chamber, wherein the lithium supplementing piece is arranged at the opening end of the lithium supplementing chamber; the lithium supplementing chamber is internally provided with a lithium supplementing part, the lithium supplementing part is internally provided with a lithium filling part, and the lithium filling part is used for supplementing lithium to the battery electrode. The structure can avoid irreversible consumption of positive active lithium in the formation process by arranging the base shell and the lithium supplementing structure, and improves the first efficiency and reversible capacity of the battery, thereby improving the cycle performance of the battery core. When the lithium ion concentration in the lithium supplementing part is low, lithium ions in the lithium supplementing part can be supplemented into the lithium supplementing part, so that the lithium supplementing time is effectively prolonged, and the battery capacity and the cycle life are improved.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a battery shell and a battery with the same.
Background
The lithium ion battery is widely applied to a plurality of fields such as 3C digital products, power automobiles, energy storage power stations and the like due to the advantages of good multiplying power performance, high safety, large capacity and the like. However, in the process of first charge and discharge, SEI film is generated on the surface of the negative electrode to cause irreversible consumption of lithium ions, so that the first coulomb efficiency of the lithium ion battery is reduced, and the battery capacity, the energy density and the cycle life are reduced.
Lithium supplementation is an ideal and practical technology for improving energy density and cycle life, and is widely researched and put into practical use by various manufacturers in the industry at present.
The existing negative electrode lithium supplementing technology based on metal lithium is limited by the safety problem of metal lithium, mainly aims at pre-lithiation of a negative electrode plate and a positive electrode plate, but has the defects of short lithium supplementing time, high requirement on material stability of a lithium supplementing agent, complex process, high cost and great commercialization difficulty due to higher positive electrode potential and limited space.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is that the existing negative electrode lithium supplementing technology based on metal lithium is limited by the safety problem of metal lithium, and the positive electrode in the pre-lithiation technology of the negative electrode plate and the positive electrode plate is high in potential and limited in space, the lithium supplementing time is short, the requirement on the material stability of the lithium supplementing agent is high, the process is complex, the cost is high, and the commercialization difficulty is high.
To this end, the present utility model provides a battery case comprising:
the base shell is suitable for being sleeved outside the battery cell;
the lithium supplementing structure is arranged between the base shell and the battery cell and is suitable for being contacted with battery electrolyte;
the lithium supplementing structure comprises a lithium supplementing piece and a lithium supplementing chamber, wherein the lithium supplementing piece is arranged at the opening end of the lithium supplementing chamber; the lithium supplementing chamber is internally provided with a lithium supplementing part, the lithium supplementing part is internally provided with a lithium filling part, and the lithium filling part is used for supplementing lithium to the battery electrode.
Optionally, the lithium supplementing piece has a lithium supplementing hole, and the lithium filling part is disposed in the lithium supplementing hole.
Optionally, the lithium supplementing member is at least one of an annular structure, an arc structure and a strip structure.
Optionally, the material of the lithium supplementing piece is any one of polyurethane, polyimide resin, porous carbon and an ion sieve.
Optionally, the lithium supplementing chamber further comprises a lithium supplementing shell; the lithium supplementing device is characterized in that a lithium supplementing cavity is formed in the lithium supplementing shell, an opening of the lithium supplementing shell faces to the lithium supplementing piece, and the lithium supplementing cavity is filled with the lithium supplementing part.
Optionally, the material of the lithium supplementing shell is carbon nanotubes.
Optionally, the material of the lithium supplement portion is any one of lithium oxide, lithium peroxide, lithium hydroxide, lithium nitride, lithium sulfide and lithium fluoride.
Optionally, the opening direction of the lithium supplementing shell points to the gravity direction.
Optionally, the lithium ion battery further comprises an insulating layer, wherein the insulating layer is arranged between the base shell and the lithium supplementing structure.
The battery is characterized by comprising a battery core and the battery shell, wherein the battery shell is sleeved on the battery core.
The technical scheme provided by the utility model has the following advantages:
1. the present embodiment provides a battery case including: a base shell and a lithium supplementing structure; wherein, the base shell is suitable for being sleeved outside the battery core; the lithium supplementing structure is arranged between the base shell and the battery cell and is suitable for being contacted with battery electrolyte; the lithium supplementing structure comprises a lithium supplementing piece and a lithium supplementing chamber, wherein the lithium supplementing piece is arranged at the opening end of the lithium supplementing chamber; a lithium supplementing part is arranged in the lithium supplementing chamber, a lithium filling part is arranged in the lithium supplementing part, and the lithium filling part is used for supplementing lithium to the battery electrode; the lithium supplementing piece is provided with a lithium supplementing hole, and a lithium filling part is arranged in the lithium supplementing hole.
This structure is through setting up basic shell and moisturizing lithium structure, basic shell is cylindrical, moisturizing lithium structure is annular structure or arc structure or bar structure, the external diameter of moisturizing lithium structure is less than the internal diameter of basic shell, moisturizing lithium structure sets up between basic shell and electric core, moisturizing lithium structure includes moisturizing lithium part and moisturizing lithium room, be provided with a plurality of moisturizing lithium holes on the moisturizing lithium part, be provided with lithium filling portion in the moisturizing lithium hole, in electric core formation charging and discharging for the first time, lithium filling portion is under electrolyte infiltration, deviate from in the moisturizing lithium hole of moisturizing lithium part, reach electric core negative pole surface through the electrolyte and participate in SEI film forming reaction, can avoid formation in-process positive active lithium's irreversible consumption, promote battery first time efficiency and reversible capacity. And because the porous structure has a certain thickness, after the lithium ions or the lithium supplement agent materials near the electrolyte side in the lithium supplement piece are consumed after multiple charge and discharge, the lithium ions in the lithium supplement piece far away from the electrolyte side can enter the lithium supplement holes on the outer side to continue working through the holes of the porous material due to the concentration difference, so that the cycle performance of the battery cell is improved. The lithium filling parts are all arranged in the battery, so that the lithium filling parts can not be contacted with substances such as air, and material failure and other safety problems caused by the stability reduction of the lithium supplementing material in the lithium filling parts are avoided; the method has simple process, is compatible with the existing lithium ion battery manufacturing process, has low cost and strong operability, and can improve the battery capacity and the cycle life. Meanwhile, by arranging the lithium supplementing chambers, the number of the lithium supplementing chambers and the lithium supplementing pieces can be correspondingly arranged, one lithium supplementing piece is arranged corresponding to one lithium supplementing chamber, or not correspondingly arranged, and one lithium supplementing chamber is arranged corresponding to a plurality of lithium supplementing pieces; the lithium supplementing piece is arranged at the opening end of the lithium supplementing chamber; the lithium supplementing chamber comprises a lithium supplementing part; when the lithium ion concentration in the lithium supplementing part is low, lithium ions in the lithium supplementing part can be supplemented into the lithium supplementing part, so that the lithium supplementing time is effectively prolonged, and the battery capacity and the cycle life are improved.
2. In this embodiment, the lithium supplementing member is made of any one of polyurethane, polyimide resin, porous carbon and an ion sieve. The specific material of the lithium supplementing piece is any one of polyurethane, polyimide resin, porous carbon, ion sieve and other porous materials containing porous structures; the porous structure of the material is lithium supplementing pores; the lithium supplementing piece can play a certain buffering role in the process of battery core movement and expansion, so that the problem of short circuit caused by friction expansion of an electrode material and a metal lithium supplementing shell is avoided, and the safety performance of the battery is improved.
3. In this embodiment, the opening direction of the lithium supplementing cavity points to the gravity direction. This structure is through setting up the benefit lithium chamber, and the opening direction of benefit lithium shell points to the direction of gravity to make the lithium ion in the lithium supplement portion under the action of gravity, can more quick with mend the lithium piece contact, mend the lithium ion in the lithium piece.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view showing the overall structure of a battery case provided in the present embodiment;
fig. 2 is a cross-sectional view of a battery case provided in the present embodiment;
fig. 3 is a schematic structural diagram of a lithium supplementing structure of a battery case provided in the present embodiment;
reference numerals illustrate:
1-a base shell;
2-lithium supplementing structure; 21-lithium supplementing piece; 22-a lithium supplementing chamber; 221-lithium supplementing shell; 222-lithium supplementing cavity; 223-lithium supplement;
3-insulating layer.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1
The present embodiment provides a battery case as shown in fig. 1 to 3; comprising the following steps: a base shell 1 and a lithium supplementing structure 2; wherein, the base shell 1 is suitable for being sleeved outside the battery cell; the lithium supplementing structure 2 is arranged between the base shell 1 and the battery cell, and the lithium supplementing structure 2 is suitable for being contacted with battery electrolyte; the lithium supplementing structure 2 comprises a lithium supplementing piece 21 and a lithium supplementing chamber 22, wherein the lithium supplementing piece 21 is arranged at the opening end of the lithium supplementing chamber 22; a lithium supplementing part 223 is arranged in the lithium supplementing chamber 22, a lithium filling part is arranged in the lithium supplementing piece 21, and the lithium filling part is used for supplementing lithium to the battery electrode; the lithium replenishing member 21 has a lithium replenishing hole in which a lithium filling portion is placed.
This structure is through setting up basic shell 1 and moisturizing structure 2, basic shell 1 is cylindrical, moisturizing structure 2 is annular structure or arc structure or bar structure, the external diameter of moisturizing structure 2 is less than the internal diameter of basic shell 1, moisturizing structure 2 sets up between basic shell 1 and electric core, moisturizing structure 2 includes moisturizing piece 21 and moisturizing room 22, be provided with a plurality of moisturizing holes on the moisturizing piece 21, be provided with lithium filling portion in the moisturizing hole, in the first formation charge and discharge of electric core, lithium filling portion is in electrolyte infiltration, deviate from in the moisturizing hole of moisturizing piece 21, reach electric core negative pole surface through the electrolyte and participate in SEI film forming reaction, can avoid formation in-process positive active lithium's irreversible consumption, promote battery first efficiency and reversible capacity. And because the porous structure has a certain thickness, after the lithium ions or the lithium supplement agent materials near the electrolyte side in the lithium supplement piece 21 are consumed after multiple charging and discharging, the lithium ions in the lithium supplement piece 21 far away from the electrolyte side can enter the lithium supplement holes on the outer side to continue working through the holes of the porous material due to the concentration difference, so that the cycle performance of the battery cell is improved. The lithium filling parts are arranged in the battery, and the lithium filling parts are not contacted with substances such as air, so that material failure and other safety problems caused by the stability reduction of the lithium supplementing material in the lithium filling parts are avoided; the method has simple process, is compatible with the existing lithium ion battery manufacturing process, has low cost and strong operability, and can improve the battery capacity and the cycle life. Meanwhile, by providing the lithium supplementing chambers 22, the number of the lithium supplementing chambers 22 and the lithium supplementing pieces 21 may be correspondingly set, and one lithium supplementing piece 21 may be correspondingly set to one lithium supplementing chamber 22, or may not be correspondingly set, and one lithium supplementing chamber 22 may be correspondingly set to a plurality of lithium supplementing pieces 21; the lithium supplementing piece 21 is arranged at the opening end of the lithium supplementing chamber 22; the lithium supplementing chamber 22 includes a lithium supplementing part 223; when the lithium ion concentration in the lithium replenishing member 21 is low, lithium ions in the lithium replenishing portion 223 are replenished to the lithium replenishing member 21, so that the lithium replenishing time is effectively prolonged, and the battery capacity and the cycle life are improved.
In the present embodiment, the lithium supplementing member 21 is at least one of an annular structure, an arc structure, and a bar structure. The lithium supplementing structure 2 is an annular structure, an arc-shaped structure or a strip-shaped structure, or any two or three of the annular structure, the arc-shaped structure and the strip-shaped structure are combined; the lithium replenishing member 21 may be irregularly shaped; the lithium supplementing pieces 21 can be regularly arranged or irregularly arranged during installation; the regular arrangement may be in an axial or radial direction.
In the present embodiment, the lithium replenishing member 21 is made of any one of polyurethane, polyimide resin, porous carbon, and ion sieve. The specific material of the lithium supplementing piece 21 is any one of polyurethane, polyimide resin, porous carbon, ion sieve and other porous materials containing porous structures; the porous structure of the material is lithium supplementing pores; the lithium supplementing piece 21 can play a certain buffering role in the process of battery core movement and expansion, so that the problem of short circuit caused by friction expansion of an electrode material and the metal lithium supplementing shell 221 is avoided, and the safety performance of the battery is improved.
In this embodiment, as shown in fig. 3; the lithium supplementing chamber 22 further includes a lithium supplementing case 221; the lithium supplementing shell 221 is provided with a lithium supplementing cavity 222, the opening of the lithium supplementing shell 221 faces the lithium supplementing piece 21, and the lithium supplementing cavity 222 is filled with a lithium supplementing part 223. The lithium replenishing portion 223 is made of any one of lithium oxide, lithium peroxide, lithium hydroxide, lithium nitride, lithium sulfide, and lithium fluoride; the lithium supplementing shell 221 is made of carbon nanotubes.
The structure is characterized in that the lithium supplementing chambers 22 are arranged, the number of the lithium supplementing chambers 22 and the lithium supplementing pieces 21 can be correspondingly arranged, one lithium supplementing piece 21 is correspondingly arranged in one lithium supplementing chamber 22, or not correspondingly arranged, and one lithium supplementing chamber 22 is correspondingly arranged in a plurality of lithium supplementing pieces 21; the lithium supplementing chamber 22 comprises a lithium supplementing shell 221, the lithium supplementing shell 221 can be made of carbon nano tubes or other materials forming a lithium supplementing cavity 222, the lithium supplementing cavity 222 is formed in the lithium supplementing shell 221, the opening of the lithium supplementing cavity 222 in the lithium supplementing chamber 22 faces to the lithium supplementing piece 21, a lithium supplementing part 223 is filled in the lithium supplementing cavity 222, the lithium supplementing part 223 is made of active lithium supplementing agent materials, and the active lithium supplementing agent materials comprise lithium oxide, lithium peroxide, lithium hydroxide, lithium nitride, lithium sulfide, lithium fluoride and the like; the lithium supplementing element 21 and the lithium filling part are manufactured by the following steps: dissolving an active lithium supplementing agent in a solution, filling the solution into a porous polymer carrier in a physical adsorption or chemical adsorption mode, or adding a lithium-containing compound in the polymerization reaction process of a porous material to form an active lithium supplementing agent material, or adsorbing lithium ions by utilizing an ion sieve to form the active lithium supplementing agent material and the like; when the lithium ion concentration in the lithium replenishing member 21 is low, lithium ions in the lithium replenishing portion 223 are replenished to the lithium replenishing member 21, so that the lithium replenishing time is effectively prolonged, and the battery capacity and the cycle life are improved.
In this embodiment, as shown in fig. 3; the opening direction of the lithium replenishment case 221 is directed in the gravity direction. This structure is through setting up the mending lithium shell 221, and the opening direction of mending lithium shell 221 points to gravity direction to make the lithium ion in the lithium replenishment portion 223 can more quick with mending lithium piece 21 contact under the action of gravity, mend the lithium ion in the mending lithium piece 21.
In this embodiment, as shown in fig. 2; the battery case further includes an insulating layer 3, and the insulating layer 3 is disposed between the base case 1 and the lithium supplementing structure 2. The insulating layer 3 in the structure is made of any one or various mixtures of ceramics, polypropylene, teflon, polystyrene and the like, and has the main function of being arranged between the base shell 1 and the lithium supplementing structure 2 to isolate the lithium supplementing material from the base shell 1 and avoid electrochemical corrosion of the metal shell.
The working principle of the battery case provided in this embodiment is specifically as follows:
in the first formation charge and discharge of the battery cell, the lithium filling part is soaked by the electrolyte, and is separated from the lithium supplementing pore of the lithium supplementing piece 21, and reaches the surface of the negative electrode of the battery cell through the electrolyte to participate in the SEI film forming reaction, so that the irreversible consumption of positive active lithium in the formation process can be avoided, and the first efficiency and reversible capacity of the battery are improved. And because the porous structure has a certain thickness, after the lithium ions or lithium supplement agent materials in the lithium supplement piece 21 close to the electrolyte side in the lithium supplement piece 21 are consumed after multiple charge and discharge, the lithium ions in the lithium supplement piece 21 far away from the electrolyte side can enter the lithium supplement holes on the outer side to continue working through the holes of the porous material due to the concentration difference, so that the cycle performance of the battery cell is improved. The lithium filling parts are all arranged in the battery, so that the lithium filling parts can not be contacted with substances such as air, and the reduction of the stability of lithium supplementing materials in the lithium filling parts is avoided, so that dangers are caused; the lithium supplementing piece 21 can play a certain buffering role in the process of battery cell movement and expansion, so that the problem of short circuit caused by friction expansion between an electrode material and the metal lithium supplementing shell 221 is avoided;
when the lithium ion concentration in the lithium replenishing member 21 is low, lithium ions in the lithium replenishing part 223 are replenished to the lithium replenishing member 21, so that the lithium replenishing time is effectively prolonged, and the battery capacity and the cycle life are improved.
Example 2
The embodiment provides a battery, which comprises a battery core and a battery shell in the embodiment, wherein the battery shell is sleeved on the battery core. The structure is characterized in that the battery shell in the embodiment is adopted, so that lithium is supplemented to the battery; this battery has all the advantages of the battery of the examples.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. A battery case, comprising:
the base shell (1) is suitable for being sleeved outside the battery cell;
the lithium supplementing structure (2), the lithium supplementing structure (2) is arranged between the base shell (1) and the battery core, and the lithium supplementing structure (2) is suitable for being contacted with battery electrolyte;
the lithium supplementing structure (2) comprises a lithium supplementing piece (21) and a lithium supplementing chamber (22), wherein the lithium supplementing piece (21) is arranged at the opening end of the lithium supplementing chamber (22); a lithium supplementing part (223) is arranged in the lithium supplementing chamber (22), and a lithium filling part is arranged in the lithium supplementing piece (21) and is used for supplementing lithium to the battery electrode.
2. The battery case according to claim 1, wherein the lithium replenishing member (21) has a lithium replenishing hole, and the lithium filling portion is provided in the lithium replenishing hole.
3. The battery case according to claim 1, wherein the lithium supplementing member (21) is at least one of a ring structure, an arc structure, and a bar structure.
4. A battery case according to any one of claims 1 to 3, wherein the lithium supplementing member (21) is made of any one of polyurethane, polyimide resin, porous carbon, and ion sieve.
5. The battery case according to claim 4, wherein the lithium supplementing chamber (22) further comprises a lithium supplementing case (221); the lithium supplementing device is characterized in that a lithium supplementing cavity (222) is arranged in the lithium supplementing shell (221), an opening of the lithium supplementing shell (221) faces the lithium supplementing piece (21), and the lithium supplementing cavity (222) is filled with the lithium supplementing part (223).
6. The battery case according to claim 5, wherein the lithium supplementing case (221) is made of carbon nanotubes.
7. The battery case according to claim 5, wherein the material of the lithium supplement portion (223) is any one of lithium oxide, lithium peroxide, lithium hydroxide, lithium nitride, lithium sulfide, and lithium fluoride.
8. The battery case according to claim 6, wherein the opening direction of the lithium replenishment case (221) is directed in the gravitational direction.
9. The battery case according to claim 1, further comprising an insulating layer (3), the insulating layer (3) being disposed between the base case (1) and the lithium supplementing structure (2).
10. A battery comprising a cell and a battery casing according to any one of claims 1 to 9, said battery casing being arranged over said cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321831252.XU CN220382167U (en) | 2023-07-12 | 2023-07-12 | Battery case and battery with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321831252.XU CN220382167U (en) | 2023-07-12 | 2023-07-12 | Battery case and battery with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220382167U true CN220382167U (en) | 2024-01-23 |
Family
ID=89571071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321831252.XU Active CN220382167U (en) | 2023-07-12 | 2023-07-12 | Battery case and battery with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220382167U (en) |
-
2023
- 2023-07-12 CN CN202321831252.XU patent/CN220382167U/en active Active
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