CN209071523U - Battery core fixture - Google Patents
Battery core fixture Download PDFInfo
- Publication number
- CN209071523U CN209071523U CN201822223715.XU CN201822223715U CN209071523U CN 209071523 U CN209071523 U CN 209071523U CN 201822223715 U CN201822223715 U CN 201822223715U CN 209071523 U CN209071523 U CN 209071523U
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- China
- Prior art keywords
- side plate
- battery core
- briquetting
- strip
- shaped hole
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- 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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Abstract
The utility model discloses a kind of battery core fixture, battery core fixture includes: bottom plate, and the bottom plate is suitable for supporting the battery core；First side plate and the second side plate, first side plate and the setting of second side plate interval, first side plate, second side plate and the bottom plate limit the battery core accommodation space for accommodating battery core；Actuator, the actuator is connected with first side plate or/and second side plate so that first side plate and second side board clamping or the release battery core.Battery core fixture according to the present utility model can effectively clamp battery core, prevent that play occurs between battery core septation and pole piece, guarantee battery in fluid injection, vacuumize, the reliability in the processes such as inflated with nitrogen, effectively improve the performance of battery.
Description
Technical field
The utility model relates to tooling fields, more particularly, to a kind of battery core fixture.
Background technique
In the related technology, battery core is laminated for non-sticky diaphragm, using vacuum liquid filling technique, is pressed from both sides using non-clamping formula fluid injection
When tool, is vacuumizing, positive pressure fluid injection, in inflated with nitrogen action process, is being easy to cause between electric core membrane and pole piece that generate part wrong
Position, while fluid injection metacneme can generate buckling phenomena, influence cell interface formation and battery performance.
Utility model content
The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model
One purpose is that proposition battery core fixture, the battery core fixture can effectively clamp battery core, prevents battery core septation and pole piece
Between occur play, guarantee battery in fluid injection, vacuumize, the reliability in the processes such as inflated with nitrogen, effectively improve battery
Performance.
A kind of battery core fixture according to the present utility model includes: bottom plate, and the bottom plate is suitable for supporting the battery core；First side
Plate and the second side plate, first side plate and the setting of second side plate interval, first side plate, second side plate and institute
It states bottom plate and limits the battery core accommodation space for accommodating battery core；Actuator, the actuator and first side plate or/and described the
Two side plates are connected so that first side plate and second side board clamping or the release battery core.
Battery core fixture according to the present utility model, actuator are suitable for driving the first side plate or the second side plate, the first side plate and
Second side plate is suitable for clamping battery core, to improve the maximal friction between the electric core membrane and pole piece in battery core remittance, makes battery core
It is less likely to occur play between diaphragm and pole piece, prevents battery core vacuumizing, positive pressure fluid injection and occur during inflated with nitrogen wrong
Position, improve battery core vacuumize, positive pressure fluid injection and stability during inflated with nitrogen, guarantee electric core membrane and pole piece in battery
Between position it is reliable and stable, improve battery processing reliability, improve battery performance.
The clamping direction of one embodiment according to the present utility model, first side plate and second side plate with it is described
Diaphragm in battery core is consistent with the stacking direction of pole piece.
On the side that one embodiment according to the present utility model, first side plate and second side plate are opposite to each other
It is respectively arranged with removably the first briquetting and the second briquetting.
One embodiment according to the present utility model, position of first briquetting on first side plate is adjustable, institute
It is adjustable to state position of second briquetting on second side plate.
One embodiment according to the present utility model is formed on first side plate and penetrates through described in a thickness direction
First strip-shaped hole of side plate is suitable for cooperating with first briquetting with by institute across the first fastener of first strip-shaped hole
The first briquetting is stated to be pressed on first side plate；It is formed on second side plate and penetrates through described second side in a thickness direction
Second strip-shaped hole of plate is suitable for cooperating with first briquetting with by described the across the second fastener of second strip-shaped hole
Two briquettings are pressed on second side plate.
One embodiment according to the present utility model, first strip-shaped hole are multiple, and multiple first strip-shaped holes
Interval setting in the lateral or vertical direction；Second strip-shaped hole is multiple, and multiple second strip-shaped holes are laterally or longitudinally
Upper interval setting.
One embodiment according to the present utility model is provided with multiple first pressures in each first strip-shaped hole
Block is provided with multiple second briquettings in each second strip-shaped hole.
One embodiment according to the present utility model, first briquetting and second briquetting are nonmetallic briquetting.
One embodiment according to the present utility model, the bottom plate are fixed on first side plate or second side plate
On.
One embodiment according to the present utility model, the bottom plate are removably mounted on described by third fastener
On side plate or the second side plate.
The additional aspect and advantage of the utility model will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 is side view when being clamped according to the battery core fixture of the utility model embodiment to battery core；
Fig. 2 is according to the battery core interior pole of the utility model embodiment and the stress diagram of diaphragm；
Fig. 3 is the schematic diagram clamped according to the battery core fixture of the utility model embodiment to battery core；
Fig. 4 is the main view according to the battery core fixture of the utility model embodiment.
Appended drawing reference:
Battery core fixture 100,
Bottom plate 110, third fastener 111,
First side plate 120, the first briquetting 121, the first strip-shaped hole 122, the first fastener 123,
Second side plate 130, the second briquetting 131, the second strip-shaped hole 132, the second fastener 133,
Battery core 200, diaphragm 201, pole piece 202.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the utility model, and should not be understood as to the utility model
Limitation.
Below with reference to Fig. 1-Fig. 4 description according to the battery core fixture 100 of the utility model embodiment.It is according to the present utility model
Battery core fixture 100 includes bottom plate 110, the first side plate 120 and the second side plate 130, and bottom plate 110 is suitable for support battery core 200, the first side
Plate 120 and the setting of the second side plate 130 interval, the first side plate 120, the second side plate 130 and bottom plate 110, which limit, accommodates battery core 200
Accommodation space, actuator be suitable for driving the first side plate 120 or/and the second side plate 130 be connected so that the first side plate 120 and second
130 clamp or release battery core 200 of side plate.
In the related technology, the anode in battery core 200 and cathode are separated by electric core membrane 201, electric core membrane 201, pole piece
Arranged stacked between 202, when using the non-clamping liquid injecting clamp made, in the vacuumizing of battery core 200, positive pressure fluid injection and inflated with nitrogen
It is easy to cause between electric core membrane 201 and pole piece 202 in the process and generates local misalignment, pleat occurs in electric core membrane 201 after fluid injection
Wrinkle, influences the formation of cell interface, reduces battery performance.
Battery core fixture 100 according to the present utility model, actuator are suitable for the first side plate 120 of driving or the second side plate 130, the
Side plate 120 and the second side plate 130 are suitable for clamping battery core 200, to improve electric core membrane 201 and pole piece in the remittance of battery core 200
Maximal friction between 202 makes that play is less likely to occur between electric core membrane 201 and pole piece 202, prevents battery core 200 from taking out
Misplace during vacuum, positive pressure fluid injection and inflated with nitrogen, improve battery core 200 vacuumize, positive pressure fluid injection and inflated with nitrogen
Stability in the process guarantees that the position in battery between electric core membrane 201 and pole piece 202 is reliable and stable, improves battery processing
Reliability, improve battery performance.
As depicted in figs. 1 and 2, one embodiment according to the present utility model, the first side plate 120 and the second side plate 130
Always, the first side plate 120 and the second side plate 130 divide the stacking direction of clamping direction and 200 septation 201 of battery core and pole piece 202
Do not apply pressure from the left and right sides of battery core 200 to battery core 200, and the diaphragm 201 in battery core 200 and pole piece 202 are in right and left
It stacks upwards, to form battery core 200, the clamping direction and diaphragm 201 of the first side plate 120 and the second side plate 130 and pole piece 202
The identical normal pressure that can be improved between pole piece 202 and diaphragm 201 of stacking direction, so improve diaphragm 201 and pole piece 202 it
Between frictional force, guarantee to be mutually shifted between diaphragm 201 and pole piece 202, make battery core 200 vacuumize, positive pressure fluid injection
It keeps stablizing with the process of inflated with nitrogen, improves the performance of battery.
Divide on the side that one embodiment according to the present utility model, the first side plate 120 and the second side plate 130 are opposite to each other
It is not provided with removably the first briquetting 121 and the second briquetting 131, the first briquetting 121 and the second briquetting 131 are respectively from battery core
200 two lateral surface compressing battery cores 200, to improve the normal pressure in battery core 200 between pole piece 202 and diaphragm 201, the first briquetting
121 and second briquetting 131 setting, concentrate the stress between diaphragm 201 and pole piece 202 more, the diaphragm 201 that ensure that with
It will not be relatively moved between certain point on pole piece 202, guarantee that the normal pressure between battery core 200 and pole piece 202 is stablized.
Further, the first briquetting 121 and the setting of 131 ground of the second briquetting are also possible that battery core 200 in positive pressure fluid injection
In the process, the space still moved with electrolysis liquid stream, if the first side plate 120 and the second side plate 130 and battery core 200 are face contact
When, the gap between 200 septation 201 of battery core and pole piece 202 is smaller, the fluid injection difficulty of electrolyte is increased, and in battery core 200
Diaphragm 201 and pole piece 202 between when being compressed by the first briquetting 121 and the second briquetting 131, only the first briquetting 121 with
The position of second briquetting, 131 face can not flow electrolyte, because being compacted between pole piece 202 and diaphragm 201 herein does not have
Gap, and other positions have the space of circulation electrolyte, can reduce the fluid injection difficulty of battery core 200.
One embodiment according to the present utility model, position of first briquetting 121 on the first side plate 120 is adjustable, and second
Position of the briquetting 131 on the second side plate 130 is adjustable, can be by adjusting the first briquetting for various sizes of battery core 200
121 and second the position change of briquetting 131 clamp the position of battery core 200 septation 201 and pole piece 202, make battery core fixture 100 can
It is suitable for various sizes of battery core 200, guarantees that battery core fixture 100 can effectively clamp battery core 200.
One embodiment according to the present utility model is formed on first side plate 120 and penetrates through the first side in a thickness direction
First strip-shaped hole 122 of plate 120, across the first strip-shaped hole 122 the first fastener 123 be suitable for the first briquetting 121 cooperate with
First briquetting 121 is pressed on the first side plate 120, is formed on the second side plate 130 and penetrates through the second side plate in a thickness direction
130 the second strip-shaped hole 132 is suitable for cooperating with the first briquetting 121 to incite somebody to action across the second fastener 133 of the second strip-shaped hole 132
Second briquetting 131 is pressed on the second side plate 130.
Wherein, the first fastener 123 can be consolidated in any one position on the extending direction of the first strip-shaped hole 122
It is fixed, so that the first briquetting 121 can be moved with the movement of the first fastener 123, and it is fixed in the first strip-shaped hole 122
Any one position adjusts the position of the first briquetting 121 arbitrarily on the extending direction of the first strip-shaped hole 122, makes
The arrangement of one briquetting 121 is more convenient flexibly；Second fastener 133 can appoint on the extending direction of the second strip-shaped hole 132
Position of anticipating is fixed, so that the second briquetting 131 can be moved with the movement of the second fastener 133, and is fixed on
Any one position in second strip-shaped hole 132 allows the position of the second briquetting 131 in the extension side of the second strip-shaped hole 132
It is any upwards to adjust, keep the arrangement of the second briquetting 131 more convenient flexibly, by can movably set the first fastener 123
It sets on the extending direction of the first strip-shaped hole 122, the second fastener 133 is movably disposed at prolonging for the second strip-shaped hole 132
It stretches on direction, first briquetting 121 and the second briquetting 131 can be arranged according to the dimensions of battery core 200, make the first pressure
The arrangement of block 121 and the second briquetting 131 is more flexible, improves the reliability and stability of the clamping of battery core fixture 100.
One embodiment according to the present utility model, the first strip-shaped hole 122 is multiple, and multiple first strip-shaped holes 122 exist
Laterally or longitudinally upper interval setting, the second strip-shaped hole 132 be it is multiple, and multiple second strip-shaped holes 132 in the lateral or vertical direction between
Every setting, the first fastener 123 can cooperate with any one the first strip-shaped hole 122, and in the extension of first strip-shaped hole 122
It is moved on direction, and the setting of multiple first strip-shaped holes 122, make the first fastener 123 that there are more positions to select space, increases
More positions of first briquetting 121, increase effective clamping range of battery core fixture 100；Similarly, the second fastener
133 can cooperate with any one the second strip-shaped hole 132, and move on the extending direction of second strip-shaped hole 132, and multiple
The setting of second strip-shaped hole 132 makes the second fastener 133 that there are more positions to select space, increases the second briquetting 131
Position increases the clamping range of battery core fixture 100, guarantees that battery core fixture 100 can steadily press from both sides battery core 200
It holds.
One embodiment according to the present utility model is provided with multiple first briquettings 121 in each first strip-shaped hole 122,
Multiple second briquettings 131 are provided in each second strip-shaped hole 132, multiple first briquettings 121 can be equably in the first bar shaped
It is distributed on hole 122, similarly, multiple second briquettings 131 can be equably distributed in the second strip-shaped hole 132, be made same
Briquetting in strip-shaped hole can be spaced apart from each other, and increased the stress point on 200 outer surface of battery core, improved battery core fixture 100
Clamping effect.
Wherein, multiple spaced apart first briquettings 121 are provided in the first strip-shaped hole 122, on the first side plate 120
It is provided with the first strip-shaped hole 122 of multiple uniform intervals settings, and is parallel to each other between multiple first strip-shaped holes 122, makes first
Multiple first briquettings on side plate 120 can be in rectangular arranged, and the first briquetting 121 is allow equably to be pressed on battery core 200
Side；Similarly, the second strip-shaped hole 132 of multiple uniform intervals settings, and multiple Article 2 are provided on the second side plate 130
It is parallel to each other between shape hole 132, allows multiple second briquettings on the second side plate 130 in rectangular arranged, make the second briquetting 131
It can be equably pressed on the other side of battery core 200, the first briquetting 121 and the second briquetting 131 correspond, and make battery core fixture
100 can steadily clamp battery core 200, and the normal pressure between the diaphragm 201 in battery core 200 and pole piece 202 is made to keep stablizing,
With ensure battery core 200 vacuumize, the process of positive pressure fluid injection and inflated with nitrogen keeps stablizing, improve the performance of battery.
One embodiment according to the present utility model, the first briquetting 121 and the second briquetting 131 be nonmetallic briquetting, first
Briquetting 121 and the second briquetting 131 allow the first briquetting 121 and the second briquetting 131 steadily will it is so structured that rubber press
Chucking power is applied to the two sides of battery core 200, while the first briquetting 121 and the second briquetting 131 being avoided to scratch battery core 200.
Wherein, the first fastener 123 and the second fastener 133 can be structured as bolt, in the first briquetting 121 and second
The threaded hole with bolt cooperation is provided on briquetting 131, bolt is adapted to pass through the first strip-shaped hole, bolt with the first briquetting
After 121 screw with merging, the head of bolt can be pressed on the side of the first strip-shaped hole, and the first fastener 123 can compress
In the other side of the first strip-shaped hole, so that the first briquetting 121 is fixed on the first side plate 120；Similarly, bolt is pressed with second
After block 131 is screwed with merging, the head of bolt can be pressed on the side of the second strip-shaped hole, and the second fastener 133 can press
Tightly in the other side of the second strip-shaped hole, so that the second briquetting 131 is fixed on the second side plate 130.
One embodiment according to the present utility model, bottom plate 110 are fixed on the first side plate 120 or the second side plate 130, bottom
Plate 110 is removably mounted on the first side plate 120 or the second side plate 130 by third fastener 111, wherein third fastening
Part 111 may include multiple bolts, be provided on the first side plate 120 or the second side plate 130 it is multiple passed through suitable for bolt it is logical
Hole, is provided on bottom plate 110 multiple with bolt face threaded hole, and each bolt passes through after corresponding through-hole and on bottom plate 110
Threaded hole cooperation, bottom plate 110 is fixed on the first side plate 120 or the second side plate 130, bottom plate 110 is allow to carry electricity
Core 200 guarantees that the process of battery core 200 is reliable and stable.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is based on the figure
Orientation or positional relationship is merely for convenience of describing the present invention and simplifying the description, rather than the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to the utility model
Limitation.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot
Structure, material or feature are contained at least one embodiment or example of the utility model.In the present specification, to above-mentioned art
The schematic representation of language may not refer to the same embodiment or example.Moreover, description specific features, structure, material or
Person's feature can be combined in any suitable manner in any one or more of the embodiments or examples.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that:
These embodiments can be carried out with a variety of variations, modification, replacement in the case where not departing from the principles of the present invention and objective
And modification, the scope of the utility model are defined by the claims and their equivalents.
Claims (10)
1. a kind of battery core fixture (100) characterized by comprising
Bottom plate (110), the bottom plate (110) are suitable for supporting the battery core；
First side plate (120) and the second side plate (130), first side plate (120) and second side plate (130) interval are set
It sets, first side plate (120), second side plate (130) and the bottom plate (110) limit the battery core receiving for accommodating battery core
Space；
Actuator, the actuator are connected so that described with first side plate (120) or/and second side plate (130)
Battery core described in side plate (120) and second side plate (130) clamp or release.
2. battery core fixture (100) according to claim 1, which is characterized in that first side plate (120) and described second
The clamping direction of side plate (130) is consistent with the stacking direction of diaphragm and pole piece in the battery core.
3. battery core fixture (100) according to claim 2, which is characterized in that first side plate (120) and described second
Removably the first briquetting (121) and the second briquetting (131) are respectively arranged on the side that side plate (130) is opposite to each other.
4. battery core fixture (100) according to claim 3, which is characterized in that first briquetting (121) is described first
Position on side plate (120) is adjustable, and position of second briquetting (131) on second side plate (130) is adjustable.
5. battery core fixture (100) according to claim 4, which is characterized in that be formed on first side plate (120)
The first strip-shaped hole (122) of first side plate (120) is penetrated through on thickness direction, passes through the of first strip-shaped hole (122)
One fastener (123) is suitable for cooperating with first briquetting (121) first briquetting (121) is pressed on first side
On plate (120)；
The second strip-shaped hole for penetrating through second side plate (130) in a thickness direction is formed on second side plate (130)
(132), it is suitable for cooperating with first briquetting (121) to incite somebody to action across the second fastener (133) of second strip-shaped hole (132)
Second briquetting (131) is pressed on second side plate (130).
6. battery core fixture (100) according to claim 5, which is characterized in that first strip-shaped hole (122) be it is multiple,
And multiple first strip-shaped holes (122) are spaced setting in the lateral or vertical direction；Second strip-shaped hole (132) is multiple, and
Multiple second strip-shaped holes (132) are spaced setting in the lateral or vertical direction.
7. battery core fixture (100) according to claim 5 or 6, which is characterized in that each first strip-shaped hole (122)
On be provided with multiple first briquettings (121), be provided with multiple second briquettings on each second strip-shaped hole (132)
(131)。
8. battery core fixture (100) according to claim 3, which is characterized in that first briquetting (121) and described second
Briquetting (131) is nonmetallic briquetting.
9. battery core fixture (100) according to claim 1, which is characterized in that the bottom plate (110) is fixed on described first
On side plate (120) or second side plate (130).
10. battery core fixture (100) according to claim 9, which is characterized in that the bottom plate (110) is fastened by third
Part (111) is removably mounted on first side plate (120) or the second side plate (130).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822223715.XU CN209071523U (en) | 2018-12-27 | 2018-12-27 | Battery core fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822223715.XU CN209071523U (en) | 2018-12-27 | 2018-12-27 | Battery core fixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209071523U true CN209071523U (en) | 2019-07-05 |
Family
ID=67102223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822223715.XU Active CN209071523U (en) | 2018-12-27 | 2018-12-27 | Battery core fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209071523U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544790A (en) * | 2019-08-30 | 2019-12-06 | 孚能科技(赣州)股份有限公司 | Cell activation method and clamping device for cell activation |
| CN112310460A (en) * | 2019-09-24 | 2021-02-02 | 宁德时代新能源科技股份有限公司 | Battery cell circulation clamp, equipment and method |
| CN115863802A (en) * | 2021-09-26 | 2023-03-28 | 宁德时代新能源科技股份有限公司 | Electricity core formation anchor clamps and electricity core formation system |
-
2018
- 2018-12-27 CN CN201822223715.XU patent/CN209071523U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110544790A (en) * | 2019-08-30 | 2019-12-06 | 孚能科技(赣州)股份有限公司 | Cell activation method and clamping device for cell activation |
| CN112310460A (en) * | 2019-09-24 | 2021-02-02 | 宁德时代新能源科技股份有限公司 | Battery cell circulation clamp, equipment and method |
| CN115863802A (en) * | 2021-09-26 | 2023-03-28 | 宁德时代新能源科技股份有限公司 | Electricity core formation anchor clamps and electricity core formation system |
| CN115863802B (en) * | 2021-09-26 | 2024-01-09 | 宁德时代新能源科技股份有限公司 | Battery cell formation clamp and battery cell formation system |
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