CN220710445U - Power battery shell and battery core - Google Patents
Power battery shell and battery core Download PDFInfo
- Publication number
- CN220710445U CN220710445U CN202322200738.XU CN202322200738U CN220710445U CN 220710445 U CN220710445 U CN 220710445U CN 202322200738 U CN202322200738 U CN 202322200738U CN 220710445 U CN220710445 U CN 220710445U
- Authority
- CN
- China
- Prior art keywords
- shell
- protective layer
- core
- layer
- core package
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011241 protective layer Substances 0.000 claims abstract description 63
- 239000010410 layer Substances 0.000 claims abstract description 33
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000001050 lubricating effect Effects 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 4
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 claims 1
- 229920002799 BoPET Polymers 0.000 abstract description 23
- 239000005041 Mylar™ Substances 0.000 abstract description 23
- 239000003792 electrolyte Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 230000008595 infiltration Effects 0.000 abstract description 4
- 238000001764 infiltration Methods 0.000 abstract description 4
- 229920000297 Rayon Polymers 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 abstract 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 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
Abstract
The utility model relates to the technical field of power batteries, and provides a power battery shell and an electric core, which comprise a shell, and further comprise a protective layer, wherein the protective layer is compounded on the inner wall of the shell and is used for isolating a core bag from the shell, the protective layer is one of a PP composite film and a PE composite film, the surface of the protective layer is smooth and has no protrusions, the electric core further comprises a glue layer, the glue layer is arranged between the protective layer and the shell and is used for bonding and fixing the protective layer and the shell, and the glue layer is acrylic acid viscose. This power battery casing, after the protective layer that sets up in the shell, the core package need not in the processing flow promptly, and the mylar membrane is established to outside cover, can directly put into the shell with the core package, put into in-process core package direct with the protective layer contact, avoid leading to the core package to produce wearing and tearing with the inside contact of shell, in addition, do not set up mylar membrane outside the core package, be favorable to the electrolyte to soak the core package, can effectively shorten the infiltration time of core package, avoid mylar membrane to hinder infiltration and the flow of electrolyte.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a power battery shell and an electric core.
Background
The electric vehicle is accepted by society due to the characteristics of energy conservation and environmental protection, and the power battery is used as an energy source of the electric vehicle to directly influence the dynamic property, reliability, safety and economy of the vehicle. Square aluminum-shell lithium batteries are increasingly used in the manufacturing process of electric vehicles.
After the core is wrapped by the multiple cores in the production and manufacturing process of the conventional square aluminum shell battery core, a layer of mylar film made of PP/PE material needs to be wrapped on the periphery of the battery core to protect the battery core and the aluminum shell in a short circuit mode, but the mylar film wrapped outside the core can prevent electrolyte from entering the inside of the core, and even more, other battery core interfaces are bad due to other discharge in the formation process of the battery core, so that the electric performance and the safety performance of the battery are affected.
The Mylar film and the battery with the publication number of CN116247381A are provided with an inner film and an outer film, and a through hole is formed in the film, so that the problem that the Mylar film can obstruct electrolyte from entering the core bag is solved. However, the use of the Mylar film prolongs the production process of the battery cell, affects the production efficiency of the battery cell, and further processing the Mylar film also increases the production cost.
Disclosure of Invention
In view of this, the utility model provides a power battery shell and a battery cell, which can prevent a mylar film outside a core package from obstructing electrolyte from entering the core package and save the process steps of coating the mylar film outside the core package so as to improve the production efficiency of the battery cell by compounding a protective layer in a square shell.
The technical scheme of the utility model is realized as follows:
in one aspect, the utility model provides a power battery shell, which comprises a shell and a protective layer, wherein the protective layer is compounded on the inner wall of the shell and is used for isolating a core bag from the shell.
On the basis of the technical scheme, preferably, the protective layer is one of a PP composite film and a PE composite film.
On the basis of the technical scheme, the adhesive layer is preferably arranged between the protective layer and the shell and used for adhering and fixing the protective layer and the shell.
Further preferably, the adhesive layer is acrylic adhesive.
Further preferably, the protective layer is compounded with the housing by thermoplastic.
On the basis of the technical scheme, preferably, the shell is a square shell with one side open.
Further preferably, the casing includes five square boards, and each square board is compounded with a protective layer.
On the basis of the technical scheme, the novel plastic core bag further comprises a lubricating layer, wherein the lubricating layer is arranged on the surface of the protective layer and used for reducing friction resistance between the core bag and the protective layer.
Further preferably, the lubricating layer is a lubricating powder.
In another aspect, the utility model provides a power battery cell, including the power battery housing described above.
Compared with the prior art, the power battery shell and the battery core have the following beneficial effects:
(1) After the protective layer is arranged in the shell, the mylar film is not required to be sleeved outside the core bag in the processing flow, the core bag can be directly put into the shell, and the core bag is directly contacted with the protective layer in the putting process, so that the abrasion of the core bag caused by the contact with the inside of the shell is avoided;
(2) After the protective layer is arranged, a mylar film is not required to be arranged on the core package, so that a gas production and exhaust channel for forming the battery cell is more conveniently increased, interface defects caused by gas are avoided, meanwhile, core package coating operation is not required, the step of assembling the battery cell is reduced, the equipment cost and the production line length of the step are further saved, and the production efficiency of the battery cell can be effectively improved;
(3) In the manufacturing process, the thickness of the shell can be changed along with the change of the thickness of the protective layer, so that the aim of reducing the weight of the battery cell under the original loudness is fulfilled, and the energy density of the battery cell is improved.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a power cell housing of the present utility model;
fig. 2 is a schematic view of the layer structure of the power battery case of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.
After the core is wrapped by the multiple cores in the production and manufacturing process of the conventional square aluminum shell battery core, a layer of mylar film made of PP/PE material needs to be wrapped on the periphery of the battery core so as to protect the short circuit of the battery core and the aluminum shell. However, due to the use of the mylar film, the production process of the battery cell is prolonged, the mylar film wrapped outside the core bag can prevent electrolyte from entering the core bag, and even more, other discharge in the process of forming the battery cell can be prevented from causing bad interface of the battery cell, so that the electrical property and the safety performance of the battery are affected.
As shown in fig. 1-2, the power battery shell according to the present utility model is generally made of aluminum as an external protection shell of the battery cell, in this embodiment, the power battery shell has a two-layer structure, namely, a shell 1 and a protection layer 2, the protection layer 2 is compounded on the inner wall of the shell 1, and completely covers the inner wall of the shell 1, so as to isolate the core pack from the shell 1, and it is noted that the thickness of the power battery shell is fixed, and in the manufacturing process, the thickness of the shell 1 can be changed along with the thickness change of the protection layer 2, so as to achieve the purpose of reducing the weight of the battery cell under the original loudness, and improve the energy density of the battery cell.
After the protective layer 2 is arranged in the shell 1, the mylar film is sleeved outside the core package, so that the core package can be directly put into the shell 1, the core package is directly contacted with the protective layer 2 in the putting process, abrasion of the core package caused by internal contact with the shell 1 is avoided, in addition, the mylar film is not arranged outside the core package, the core package is immersed in electrolyte, the immersion time of the core package can be effectively shortened, and the mylar film is prevented from obstructing the immersion and flow of the electrolyte.
In addition, after the protective layer 2 is arranged, a mylar film is not required to be arranged on the core package, so that the gas production and exhaust channel of the battery cell formation is more conveniently increased, interface defects caused by gas are avoided, meanwhile, core package coating operation is not required, the step of assembling the battery cell is reduced, the equipment cost and the production line length of the step are further saved, and the production efficiency of the battery cell can be effectively improved.
The thickness of the protective layer 2 can be selected in the range of 20-500 mu m to meet the production requirements of different battery cells, and the thickness of the aluminum shell can be changed along with the thickness change of the polymer film so as to achieve the purpose of reducing the weight of the battery cells under the original strength and improve the energy density of the battery cells.
In a specific embodiment, the protective layer 2 is preferably one of a PP composite film and a PE composite film, specifically a PP polymer composite film or a PE polymer composite film, and after the protective layer 2 is formed, the protective layer 2 is directly compounded into the casing 1, so as to realize the combination of the protective layer 2 and the casing 1, so as to form a power battery casing.
In addition to the above-described combination of the protective layer 2 and the case 1, the protective layer 2 may be formed by adhering the protective layer 2 as a molten material to the inner wall of the case 1 and then cooling and solidifying the molten material, and the protective layer 2 and the case 1 may be combined into one body.
As a preferred embodiment, the surface of the protective layer 2 needs to be in a smooth and non-protruding state, and this arrangement is used for avoiding the irregular protrusions or particles on the protective layer 2 from generating larger friction with the core package when the core package is put into the shell, so as to influence the overall performance of the core package, effectively improve the yield of the battery cell production and ensure the stable quality of the core package.
In a specific embodiment, the protective layer 2 is compounded into the shell 1 as a film, and a glue layer 3 is further arranged between the protective layer 2 and the shell 1 and used for bonding and fixing the protective layer 2 and the shell 1, the protective layer 2 and the shell 1 are stably compounded and fixed through the glue layer 3, specifically, the shell 1 can be coated with the glue layer 3 first, then the protective layer 2 is sleeved on a specific mold, the protective layer 2 is sent into the shell 1 through the mold, the protective layer 2 and the shell 1 are bonded and fixed through the glue layer 3, and the glue layer 2 can be acrylic acid viscose.
In addition to the lamination of the protective layer 2 with the housing 1 by means of the glue layer 3, in another embodiment, the protective layer 2 is laminated with the housing 1 by means of thermoplastic, so that the purpose of laminating the protective layer 2 with the housing 1 is also achieved.
In this embodiment, the power battery case is used as the case of the square battery cell, the case 1 is a square case with an opening at one side, the opening side is the side of the core package into the case, the core package is formed by stacking a spacer, a positive plate and a negative plate in sequence, the stacked first layer and last layer are both spacers, after stacking, the stacked first layer and last layer are wound and formed along the outer side similar to a square plate, two sides in the length direction of the core package form arc surfaces similar to a cylinder, the arc surfaces are used as the inner structure of the square battery cell, the positive and negative poles of the square battery cell need to be connected with the positive plate and the negative plate on the core package, after the wound spacer, the positive plate and the negative plate form the core package, a plurality of shaping tapes are adhered to the outer side, and each shaping tape is respectively arranged at two sides in the width direction of the core package, so that when the core package is placed in the case 1, the side perpendicular to the winding direction is placed in the opening of the case 1.
In another specific embodiment, the casing 1 includes five square plates 11, the five square plates 11 are welded to each other to form the casing 1, and the protective layer 2 is compounded on each square plate 11, that is, before the casing 1 is formed by welding, the protective layer 2 is compounded on the square plates 11, and after the casing 1 is formed by welding, the complete protective layer 2 covering the core package can be provided inside the casing 1.
As a preferred embodiment, still include lubricating layer 4, lubricating layer 4 sets up the surface of protective layer 2 for reduce the frictional resistance of core package and protective layer 2, set up lubricating layer 4 in order to satisfy the income shell assembly demand of high group margin electric core through protective layer 2, also effectively reduced the coefficient of friction when protective layer 2 and core package go into the shell simultaneously.
In particular, the lubricating layer 4 is preferably a lubricating powder, and solid lubricating powder, such as graphite powder, may be selected, and in this embodiment, the lubricating layer 4 may be disposed only on the surface of the protecting layer 2 near the open end of the casing 1, so as to avoid that the excessive amount of the lubricating layer 4 affects the energy density of the battery cell.
On the other hand, the utility model provides a power battery cell, which comprises the power battery shell, wherein the protective layer 2 is arranged in the shell 1, so that the mylar process of the power battery in the assembly process can be canceled, the cell is directly put into the shell after being bonded, the number of the cell production processes is reduced, mylar is canceled to help to improve the infiltration of electrolyte to the cell, the cell infiltration standing time is shortened, and mylar is canceled to help to increase the gas-generating exhaust channel of the cell, the interface defect caused by gas is avoided, the rapid storage and slow release of the electrolyte can be realized, and the cycle life and the electrical property of the cell are improved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (9)
1. A power cell housing comprising a casing (1), characterized in that: the novel plastic core packaging structure is characterized by further comprising a protective layer (2), wherein the shell (1) is a square shell with one side open, and the protective layer (2) is compounded on the inner wall of the shell (1) and used for isolating the core package from the shell (1).
2. The power cell housing of claim 1, wherein: the protective layer (2) is one of a PP composite film and a PE composite film.
3. The power cell housing of claim 2, wherein: still include glue film (3), glue film (3) set up between protective layer (2) and shell (1) for with protective layer (2) and shell (1) bonding fixed.
4. A power cell housing as claimed in claim 3, wherein: the adhesive layer (3) is acrylic acid adhesive.
5. The power cell housing of claim 2, wherein: the protective layer (2) is compounded with the housing (1) by thermoplastic.
6. The power cell housing of claim 5, wherein: the shell (1) comprises five square plates (11), and a protective layer (2) is compounded on each square plate (11).
7. The power cell housing of claim 1, wherein: the novel plastic core pack further comprises a lubricating layer (4), wherein the lubricating layer (4) is arranged on the surface of the protective layer (2) and is used for reducing friction resistance between the core pack and the protective layer (2).
8. The power cell housing of claim 7, wherein: the lubricating layer (4) is lubricating powder.
9. The utility model provides a power battery electric core which characterized in that: comprising a power cell housing according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322200738.XU CN220710445U (en) | 2023-08-16 | 2023-08-16 | Power battery shell and battery core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322200738.XU CN220710445U (en) | 2023-08-16 | 2023-08-16 | Power battery shell and battery core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220710445U true CN220710445U (en) | 2024-04-02 |
Family
ID=90444273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322200738.XU Active CN220710445U (en) | 2023-08-16 | 2023-08-16 | Power battery shell and battery core |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220710445U (en) |
-
2023
- 2023-08-16 CN CN202322200738.XU patent/CN220710445U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |