CN103594745A - Method and device for improving performance of lithium ion battery - Google Patents
Method and device for improving performance of lithium ion battery Download PDFInfo
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- CN103594745A CN103594745A CN201310571079.9A CN201310571079A CN103594745A CN 103594745 A CN103594745 A CN 103594745A CN 201310571079 A CN201310571079 A CN 201310571079A CN 103594745 A CN103594745 A CN 103594745A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 54
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000011149 active material Substances 0.000 claims abstract description 12
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 13
- 230000004888 barrier function Effects 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000004913 activation Effects 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000007773 negative electrode material Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- 230000000994 depressogenic effect Effects 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 3
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000005536 Jahn Teller effect Effects 0.000 description 1
- 229910015645 LiMn Inorganic materials 0.000 description 1
- 229920004933 Terylene® Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
本发明提供一种锂离子提高电池性能的方法，即在所述电池极片上均匀地施加压力，本发明还提供一种在电池生产时对电池极群组进行预压力的生产制备方法，以及在使用中的一种对电池加压装置，利用对电池加压的方法能抑制电池膨胀，减小电池在化成激活阶段的电极变形，使电池厚度更一致，加压还可以提高锂离子电池在正极和负极材料中的Li+扩散过程，减小电池内部极化和电池内阻。同时，提高电池放电电压平台，电池输出功率增大；通过加压提高电池充电接受能力，提高电池可逆性，缩短充电时间，提高活性物质利用率，提高电池容量以及电池有效输出能量，并抑制由于电池充放电活性物质膨胀而导致的结构破坏，从而可以延长电池使用寿命。
The invention provides a method for lithium ion to improve battery performance, that is, to apply pressure uniformly on the battery pole piece. The invention also provides a production and preparation method for pre-pressing the battery electrode group during battery production, and A battery pressurization device in use can suppress battery expansion by using the battery pressurization method, reduce the electrode deformation of the battery during the formation and activation stage, and make the battery thickness more consistent. Pressurization can also improve the positive electrode of the lithium-ion battery. And the Li + diffusion process in the negative electrode material, reducing the internal polarization of the battery and the internal resistance of the battery. At the same time, the discharge voltage platform of the battery is increased, and the output power of the battery is increased; the charging acceptance capacity of the battery is improved by pressurization, the reversibility of the battery is improved, the charging time is shortened, the utilization rate of the active material is improved, the battery capacity and the effective output energy of the battery are increased, and the due to The structural damage caused by the expansion of the active material of the battery during charge and discharge can prolong the service life of the battery.
Description
Technical field
The present invention relates to a kind of method and device thereof that improves performance of lithium ion battery.
Background technology
Lithium ion battery is used widely in the power supply with small capacity field of portable type electronic product, along with the application of high capacity lithium ion battery in Moped Scooter and electric motor car, to the actual environment of cell high-capacity, high voltage, low cost, adaptation winter low temperature and cycle life performance, require more and more higher.Spinelle LiMn
2o
4positive electrode contradiction is particularly outstanding, and manganate cathode material for lithium cost and cell voltage have a clear superiority in, but heavy-current discharge polarization and cycle life are obviously not enough, and this is main causes structural deterioration closely related with material expansion
Acid lithium anode material changes as follows at charge and discharge process:
Due to Li
+the de-embedding of ion and Mn
3+, Mn
4+change and cause structure to be out of shape along octahedra axial stretching, be i.e. Jahn-Teller effect; Along with charge and discharge cycles, material structure destroys gradually, invertibity variation, and battery capacity is just decline gradually also.Although circulation, to other material, comprises that negative material structural damage does not have manganate cathode material for lithium obvious.But the swollen cycle life that also affects significantly lithium ion battery of the positive and negative pole material volume that the de-embedding of lithium ion causes contracting.
In addition at analysing valve control type lead-acid accumulator battery in charge and discharge cycles process, on positive pole due to PbO
2be converted into PbSO
4the swollen original structure that also easily causes of volume contracting destroy, between active material, contact variation, invertibity declines, and causes inducing capacity fading and battery capacity early failure (being commonly referred to PCL-2 failure mode).Traditional lead acid accumulator solution is that positive plate is made to tubular structure, positive active material is filled in the terylene sleeve pipe of porous, suppress positive active material in cyclic process and expand, extending battery life greatly, but tubular structure plate technique more complicated.
Existing two patent of invention file (CN 1967922A, CN 1967925A) in, illustrated pressurized applications formation charging stage in lithium ion battery production process, to be conducive to battery, just changing into middle minimizing, negative plate pole plate in activation expands and causes the integral thickness of pole piece deformation effect battery, the cell thickness difference that makes to dispatch from the factory can be controlled in 0.1mm with interior and can to make battery bleed cleaner, to reduce aeration, but said method still cannot solve in use square structure lithium ion battery at present, especially aluminum plastic film soft package structure and adopt manganate cathode material for lithium, due to circulating battery use procedure electrode deformation and anode structure expansion damage, cause battery capacity to fail too early, obviously shorten the problems such as battery.
Summary of the invention
The present invention improves the problems referred to above, be that the technical problem to be solved in the present invention prevents in lithium ion battery use procedure due to circulating battery use procedure electrode deformation and anode structure expansion damage, cause battery capacity to fail too early, obviously shorten the problems such as battery.
Specific embodiment of the invention scheme is: a kind of method that improves performance of lithium ion battery, it is characterized in that, and described battery pole piece surface uniform ground appropriateness is exerted pressure, and described pressure is 100～300KPa.
The second scheme of the invention of the present invention is: a kind of manufacture that improves performance of lithium ion battery, it is characterized in that, shown in battery there is the lithium ion battery of rectangular cell shell or takeup type utmost point group structure, comprise following manufacture step:
(1) by stacking pole piece finish-drying, between negative pole and positive pole, be provided with barrier film;
(2) overlapping successively according to the order of negative pole, barrier film, positive pole, barrier film, after being stacked, be wound into flat, to battery pressurization, Shi Ji group is fixed-type, to avoid the middle part of pole piece coiling to increase thickness to outer process;
(3) Jiang Ji group puts into outer rigid housing, and the ，Jiang Ji group of pressurizeing for the second time fills in battery case Zhong，Shi Ji group inside tightly certain assembling pressure;
(4) battery to step 3 injects electrolyte, charging, sealing;
(5), along with the expansion of charging process pole piece, rely on the rigidity Shi Ji group inside of battery case to there is certain pressure, the object of exerting pressure to reach Dui Ji group, reduce battery polarization, slow down active material structure degradation on pole piece, improve battery capacity, extend battery.
Further, the described battery case of step (3) inner side has tapering up and down, to increase operability.
The 3rd scheme of the invention of the present invention is: a kind of device that improves battery performance, it is characterized in that, comprise the upper lower plate for boosting battery, described train wheel bridge top is provided with a rigid plate, between rigid plate and train wheel bridge, be provided with pressure sensor, described pressure sensor lower end acts on train wheel bridge, and described rigid plate and lower plate are bolted.
Further, between described train wheel bridge and lower plate, be provided with a plurality of middle splint for boosting battery.
Compared with prior art, the present invention has following beneficial effect: (1) has suppressed cell expansion by pressurization, reduces battery at the electrode deformation that changes into the activation stage, and cell thickness is more consistent; (2) by pressurization, improved significantly the Li of lithium ion battery in anodal and negative material
+diffusion process, reduces inside battery polarization and the internal resistance of cell, meanwhile, improves battery discharge voltage platform, and battery power output increases; By pressurization, improve battery charge acceptance, improve battery invertibity, shorten the charging interval; (3) by pressurization, improve active material utilization, improve the structural deterioration that battery capacity and battery are effectively exported energy and suppressed to cause due to the expansion of battery charging and discharging active material, thereby can extend battery; (4) the present invention is alleviated by strengthening air chamber space, side and unidirectional valve for the issuable gas of lithium ion battery.
The method that the present invention adopts and device are very simple, the rectangular lithium ion battery of can be widely used in reeling pole piece or lamination, and the method and device are not only applied to the lithium ion battery group that single lithium ion battery also can form for a plurality of battery series-parallel connections.
Accompanying drawing explanation
Fig. 1 is that lithium ion battery is depressed cell internal pressure variation correction data figure in pressurization with not.
Fig. 2 depresses lithium ion cell charging and discharge process positive and negative electrode potential change schematic diagram for adding.
Fig. 3 is for to depress capacity of lithium ion battery schematic diagram outward in difference.
Fig. 4 is monocell pressue device figure.
Fig. 5 is battery pack pressue device figure.
In figure: 10-train wheel bridge, 20-lower plate, 30-rigid plate, 40-pressure sensor, 50-middle splint, 100-battery.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
As shown in Fig. 1～2, be the associated electrical chemical property check experiment data after lithium ion battery pressurization.
As shown in Figure 1, for lithium ion battery is depressed internal pressure delta data figure outside adding.
When lithium ion battery is contraction state in electric discharge Tai Shiji group, now volume is minimum.We discharge battery (100%DOD) completely for this reason, be depressed into 300kPa, and battery is charged and discharge cycles outside then lithium ion battery being added, and inner pressure of lithium ion battery changes as shown in Figure 1.At 300 kPa, depress pressure in charging, discharging electric batteries process outward and change about 160kPa.If cell or battery module Zhong Ji group are not limited by external pressure, in charge and discharge process, active material will occur significantly to expand so, thereby cause active material structural deterioration and shorter battery life.
As shown in Figure 2, for lithium ion battery is depressed cell voltage variation correction data in pressurization with not.
When battery discharges under applying external pressure, lithium ion battery voltage platform is higher, and electrode polarization is less; Compare, outside not applying, depress, electrode polarization is larger, and battery pressure drop is larger, effectively exports energy less.When charging, particularly, in the charging middle and later periods, impressed pressure has obviously reduced electrode polarization, and charging voltage is lower.Therefore in charging and discharging process, pressurization has obviously improved battery discharge voltage platform and charge acceptance, thereby has also improved capacity of lithium ion battery.
Following table is not depressed lithium-ion battery with aluminium plastic film capacity, voltage platform and charge efficiency for pressurizeing and adding.
| Pressure/kPa | Capacity/mAh | Pressure/V in electric discharge | Charge efficiency/% |
| 0 | 1115.7 | 3.581 | 97.5 |
| 300 | 1137.9 | 3.612 | 98.0 |
As shown in Figure 3: for difference is depressed capacity of lithium ion battery outward.
Fig. 3 shows that battery capacity also increases along with lithium ion battery impressed pressure is increased, but after surpassing 300kPa, capacity of lithium ion battery changes not obvious.
Thus, a kind of method that improves performance of lithium ion battery, on battery pole piece, appropriateness is exerted pressure equably, described pressure is 100 kPa～300kPa, because inside lithium ion cell pole piece expands, its maximum pressure is less than 500KPa, and this pressure is much smaller than the safe range of lithium ion battery crimp test pressurized.
The method has the following advantages:
(1) reduce battery at the electrode deformation that changes into the activation stage, cell thickness is more consistent; (2) by pressurization, improved significantly the Li of lithium ion battery in anodal and negative material
+diffusion process, reduces inside battery polarization and the internal resistance of cell, meanwhile, improves battery discharge voltage platform, and battery power output increases; By pressurization, improve battery charge acceptance, improve battery invertibity, shorten the charging interval; (3) by pressurization, improve active material utilization, improve the structural deterioration that battery capacity and battery are effectively exported energy and suppressed to cause due to the expansion of battery charging and discharging active material, thereby can extend battery; (4) the present invention is alleviated by strengthening air chamber space, side and unidirectional valve for the issuable gas of lithium ion battery.
The present invention also comprises a kind of method that improves performance of lithium ion battery, it is characterized in that, shown in battery there is the lithium ion battery of rectangular cell shell or takeup type utmost point group structure, comprise following preparation method:
(1) by stacking pole piece finish-drying, between negative pole and positive pole, be provided with barrier film;
(2) overlapping successively according to the order of negative pole, barrier film, positive pole, barrier film, after being stacked, be wound into flat, to battery pressurization, Shi Ji group is fixed-type, to avoid the middle part of pole piece coiling to increase thickness to outer process;
(3) Jiang Ji group puts into outer rigid housing, and the ，Jiang Ji group of pressurizeing for the second time fills in battery case Zhong，Shi Ji group inside tightly certain assembling pressure;
(4) battery to step 3 injects electrolyte, charging, sealing;
(5), along with the expansion of charging process pole piece, rely on the rigidity Shi Ji group inside of battery case to there is certain pressure, the object of exerting pressure to reach Dui Ji group, reduce battery polarization, slow down active material structure degradation on pole piece, improve battery capacity, extend battery.
As shown in Figure 4, the present invention also comprises a kind of device that improves performance of lithium ion battery, comprise train wheel bridge 10 and lower plate 20 for boosting battery, described train wheel bridge 10 tops are provided with a rigid plate 30, between rigid plate 30 and train wheel bridge 10, be provided with pressure sensor 40, described pressure sensor 40 lower ends act on train wheel bridge 10, and described rigid plate 30 is bolted with lower plate 20.
This device using method is as follows:
(1) according to lithium ion battery size, select suitable rigid insulation plate;
(2) keep flat the lithium ion battery of flexible package, in utilization, lower plate is clamped battery, and the size of upper lower plate equals or is slightly larger than the length of battery and wide, exposes lug and air bag, and the clamping plate of boosting battery require smooth surface, can not puncture battery soft packaging bag;
(3) put pressure sensor 40 and rigid plate 30, then 30 4 jiaos of rigid plate, screw down, when tightening self-contained battery by square head bolts and pressurizeing, guarantee to press from both sides that two plate faces of battery are parallel or four jiaos of clearance distances are the same, so that battery uniform stressed, and make battery pressurized reach setting; Pressure sensor is externally connected to pressure on the number display list, can directly obtain battery applied pressure.
This device is applicable to monocell, battery pack or battery module, can transfer the pressure to any apparatus and method in battery pole piece Huo Ji group by shell.
As shown in Figure 5, between described train wheel bridge and lower plate, be provided with a plurality of middle splint 50 for boosting battery 100.Often adjacent two batteries are according to anodal anticathode, negative pole is installed positive pole, to shorten, is connected in series wire, is placed with the insulation middle splint 50 of certain degree of hardness between battery, by fastening nut, make battery pack reach certain gauge, make it battery pack correspondence and be subject to certain pressure.
The battery pack use of working under this pressure.Also battery pack can be packed under certain pressure in the large battery pack groove with rigidity, this battery case is not only in order to place or packed battery group, the more important thing is battery pack is entered after groove being subject to carrying out work under controlled certain pressure, to reach and to improve lithium ion battery group performance and useful life.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. a method that improves performance of lithium ion battery, is characterized in that, is applied with equably pressure on lithium ion pole piece.
2. a kind of method that improves performance of lithium ion battery according to claim 1, described pressure is 100 kPa～300kPa.
3. a preparation method that improves performance of lithium ion battery, is characterized in that, described battery is the lithium ion battery with rectangular cell shell or takeup type utmost point group structure, comprises following manufacture step:
(1) by stacking pole piece finish-drying, between negative pole and positive pole, be provided with barrier film;
(2) overlapping successively according to the order of negative pole, barrier film, positive pole, barrier film, after being stacked, be wound into flat, to battery pressurization, Shi Ji group is fixed-type, to avoid the middle part of pole piece coiling to increase thickness to outer process;
(3) Jiang Ji group puts into outer rigid housing, and the ，Jiang Ji group of pressurizeing for the second time fills in battery case Zhong，Shi Ji group inside tightly certain assembling pressure;
(4) battery to step 3 injects electrolyte, charging, sealing;
(5), along with the expansion of charging process pole piece, rely on the rigidity Shi Ji group inside of battery case to there is certain pressure, the object of exerting pressure to reach Dui Ji group, reduce battery polarization, slow down active material structure degradation on pole piece, improve battery capacity, extend battery.
4. a kind of preparation method that improves performance of lithium ion battery according to claim 3, has tapering inside battery case in described step (3), up and down to increase operability.
5. the device that can improve performance of lithium ion battery, it is characterized in that, comprise the upper lower plate for boosting battery, described train wheel bridge top is provided with a rigid plate, between rigid plate and train wheel bridge, be provided with pressure sensor, described pressure sensor lower end acts on train wheel bridge, and described rigid plate and lower plate are bolted.
6. a kind of device that improves performance of lithium ion battery according to claim 5, is provided with a plurality of middle splint for boosting battery between described train wheel bridge and lower plate.
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| CN106935913A (en) * | 2015-12-31 | 2017-07-07 | 深圳市比克动力电池有限公司 | The preparation method of lithium ion battery |
| CN108232338A (en) * | 2016-12-09 | 2018-06-29 | 罗伯特·博世有限公司 | For handling the method for energy storage unit |
| CN108400391A (en) * | 2018-04-28 | 2018-08-14 | 界首市菁华科技信息咨询服务有限公司 | A kind of preparation method of the high energy storing lead acid storage battery of sealing of fast charging and discharging |
| CN109596982A (en) * | 2017-09-28 | 2019-04-09 | 宁德时代新能源科技股份有限公司 | battery detection structure |
| CN109755652A (en) * | 2017-11-06 | 2019-05-14 | 汽车能源供应公司 | The pressure method and manufacturing method of film cased battery |
| CN111398825A (en) * | 2020-04-14 | 2020-07-10 | 中国科学院青岛生物能源与过程研究所 | Device and method for testing electrochemical performance of lithium battery and observing cross-sectional morphology |
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| WO2022145909A1 (en) * | 2020-12-29 | 2022-07-07 | 주식회사 엘지에너지솔루션 | Battery module having structure capable of absorbing swelling, and battery pack and vehicle comprising same |
| US20220311081A1 (en) * | 2021-03-26 | 2022-09-29 | Sion Power Corporation | Battery pack and related components and methods |
| WO2025010954A1 (en) * | 2023-07-13 | 2025-01-16 | 宁德时代新能源科技股份有限公司 | Battery pressurizing device and battery production system |
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