CN220873800U - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
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- CN220873800U CN220873800U CN202322436179.2U CN202322436179U CN220873800U CN 220873800 U CN220873800 U CN 220873800U CN 202322436179 U CN202322436179 U CN 202322436179U CN 220873800 U CN220873800 U CN 220873800U
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- bare cell
- battery
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- protection film
- protective film
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- 230000001681 protective effect Effects 0.000 claims abstract description 56
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 239000006260 foam Substances 0.000 claims description 18
- 230000005489 elastic deformation Effects 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 239000004642 Polyimide Substances 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 7
- 229920002379 silicone rubber Polymers 0.000 claims description 7
- 239000004945 silicone rubber Substances 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 6
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- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 24
- 230000008569 process Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 239000003792 electrolyte Substances 0.000 description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 238000007599 discharging Methods 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000670 limiting effect Effects 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
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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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
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model provides a battery and a battery pack, wherein the battery comprises a bare cell, a shell and a flexible protective film, the shell is used for accommodating the bare cell, and the flexible protective film is coated on the outer side of the bare cell and used for realizing insulation between the bare cell and the shell. The hardness of the flexible protection film is 20 HB-50 HB, the flexible protection film in the hardness range can be directly coated on the outer wall of the bare cell and fully attached to the bare cell, then the bare cell coated with the flexible protection film is placed in the shell to realize insulation between the bare cell and the shell, and the flexible protection film has stronger binding force on the bare cell, can play roles of constraining formation and constraining capacity division, and can prevent the phenomena of wrinkling or purple spots and the like of a battery pole piece in the charge and discharge process, thereby improving the production quality of the battery.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a battery and a battery pack.
Background
With the popularization of new energy automobiles, the lithium ion battery is widely applied to the field of new energy automobiles due to the advantages of high energy density, high energy storage, long service life and the like, and the performance of the lithium ion battery directly influences the cruising ability, driving safety and the like of the new energy automobiles, so that the design requirements of the vehicle industry on the lithium ion battery are strict.
The lithium ion battery generally comprises a shell, a bare cell, a cooling structure for cooling the battery, and the like, wherein the bare cell is a core component of the lithium ion battery and can store electric quantity or discharge electric quantity, so that the charge and discharge functions of the lithium ion battery are realized. The outside of naked electric core is usually coated with one or more layers of protective films to realize the insulation between the naked electric core and the shell, avoid the occurrence of short circuit phenomenon, and influence the normal use of the lithium ion battery.
At present, in a common lithium ion battery, a protective film outside a bare cell is often made of tough polyester polymer materials, the protective film made of the tough polyester polymer materials has no binding force on the battery, battery pole pieces are stuck together by the binding capacity after hot pressing, and the battery possibly has the abnormality that pole pieces are wrinkled or purple spots and the like in partial areas due to the adhesion problem in the charging and discharging process, so that the cycle performance of the battery is affected.
Disclosure of utility model
In view of the above, the present utility model provides a battery and a battery pack, which at least solve the problem that wrinkling or purple spot is easy to occur in the existing battery manufacturing process.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
The utility model discloses a battery, comprising: a bare cell; a housing for accommodating the bare cell; and the flexible protection film is coated on the outer wall of the bare cell and used for realizing insulation between the bare cell and the shell, and the hardness of the flexible protection film is 20 HB-50 HB.
Optionally, the flexible protection film can elastically deform to be clung to the outer wall of the bare cell, and the elastic deformation amount of the flexible protection film is 0.05 mm-1 mm.
Optionally, the flexible protection film is provided with a plurality of through holes penetrating through the thickness of the flexible protection film, and the opening area of each through hole is 60um 2～10000um2.
Optionally, the porosity of the flexible protective film is 50% -90%.
Optionally, the plurality of through holes are arranged in an array on the flexible protection film.
Optionally, the thickness of the flexible protective film is 0.5 mm-3 mm.
Optionally, the flexible protective film is a silicone rubber foam film, a polyimide foam film or a polyurethane flexible foam film.
Optionally, the bare cell is provided with a tab, and the flexible protection film is provided with a hollowed-out part; the hollowed-out part is used for penetrating through the electrode lug so that the electrode lug is exposed out of the flexible protective film.
Optionally, the battery further comprises: a top cover sheet; the top cover sheet covers the opening of the shell, and the flexible protective film is connected with the top cover sheet in a hot melting mode.
The utility model also discloses a battery pack comprising the battery of any one of the above.
Compared with the prior art, the battery and the battery pack have the following advantages:
The battery comprises a bare cell, a shell and a flexible protective film, wherein the shell is used for accommodating the bare cell, and the flexible protective film is coated on the outer side of the bare cell and is used for realizing insulation between the bare cell and the shell. The hardness of the flexible protective film is 20 HB-50 HB, the flexible protective film in the hardness range can be directly coated on the outer surface of the bare cell and fully attached to the bare cell, then the bare cell coated with the flexible protective film is placed in the shell, insulation between the bare cell and the shell can be realized, the operation mode is simple and quick, the flexible protective film is not required to be fixed by other tools, and therefore the production cost of the battery can be effectively controlled. The flexible protective film has strong binding force on the bare cell, can play roles in constraining formation and constraining capacity division, and prevents the phenomena of wrinkling or purple spots and the like of the battery pole piece in the charge and discharge process, thereby improving the production quality of the battery.
The battery pack of the present utility model has the same or similar advantages as those of the battery according to the prior art, and is not described herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
fig. 1 is a schematic view of a battery in the present embodiment;
FIG. 2 is a schematic view of a flexible protective film in this embodiment;
Fig. 3 is a top view of a battery in this embodiment.
Reference numerals illustrate:
1-bare cell, 10-tab, 2-shell, 3-flexible protection film, 30-through hole, 4-top cover plate.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. 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.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present utility model may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
It should be appreciated that reference throughout this specification to "one embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present utility model. Thus, the appearances of the phrase "in one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following describes in detail a battery and a battery pack provided by the present utility model by listing specific examples.
Referring to fig. 1, the present utility model provides a battery including: a bare cell 1; a housing 2 for accommodating the bare cell 1; and a flexible protection film 3 which is coated on the outer side of the bare cell 1 and is used for realizing insulation between the bare cell 1 and the shell 2, wherein the hardness of the flexible protection film 3 is 20 HB-50 HB.
Specifically, the bare cell 1 is a main body member of the battery, determines the charge/discharge capacity of the battery, and the case 2 has a housing chamber for housing the bare cell 1, and the bare cell 1 is placed in the housing chamber to mount and fix the bare cell 1. The flexible protection film 3 is coated on the outer wall of the bare cell 1 and used for realizing insulation between the bare cell 1 and the shell 2, so that the phenomenon of short circuit is avoided, and the normal use of the battery is influenced. In the traditional mode, the protection film on the outer side of the bare cell 1 is usually made of tough polyester polymer materials, the protection film made of the tough polyester polymer materials is hard in texture, the protection film is required to be folded into a fixed shape and then put into the shell 2, the protection film is required to be adhered to a plurality of positions of the shell 2 by gummed paper for fixation, meanwhile, the protection film cannot be fully adhered to the bare cell 1, no binding force is generated on the bare cell 1, and the battery possibly has the defects of pole piece wrinkling or purple spots and the like in the charging and discharging process. Based on this, the flexible protective film 3 is used as the protective film of the present embodiment, and the hardness of the flexible protective film 3 is 20HB to 50HB, specifically, 20HB, 25HB, 35HB, 41HB, 50HB, etc., may be set, and the hardness means the brinell hardness, and the softer the material, the harder the material, the softer the brinell hardness. The flexible protection film 3 in the hardness range can be directly coated on the outer surface of the bare cell 1, a protective shell with the same size and shape as the bare cell 1 is not required to be folded in advance, the flexible protection film 3 is coated on the outer surface of the bare cell 1 and then is fully attached to the bare cell 1, then the bare cell 1 coated with the flexible protection film 3 is placed in the shell 2, insulation between the bare cell 1 and the shell 2 can be realized, the operation mode is simple and quick, other tools are not required to fix the flexible protection film 3, and therefore the production cost of a battery can be effectively controlled. The flexible protective film 3 has strong binding force on the bare cell 1, can play roles in restraining formation and restraining capacity division during battery formation and primary charge and discharge, and prevents the phenomena of wrinkling or purple spots and the like of a battery pole piece in the charge and discharge process, thereby improving the production quality of the battery.
Further, the following table provides some examples and comparative examples: the hardness of the flexible protective film can be measured by using a Brinell hardness measurement experiment method in the prior art, the fold rate of the pole piece can be obtained by taking a certain number of sample batteries, coating the batteries under the same conditions, performing formation, capacity division and charging and discharging for the same times under the same conditions, disassembling the batteries, observing whether folds are generated on the pole piece of the battery, observing whether the folds are formed on the surface of the pole piece or the battery with a purple plate is the battery with the folds of the pole piece, and calculating the percentage of the batteries accounting for the total amount of the battery samples to obtain the fold rate of the pole piece of the battery.
| Hardness of the Flexible protective film | Fold rate of battery pole piece | |
| Example 1 | 20HB | 0.50％ |
| Example 2 | 25HB | 0.60％ |
| Example 3 | 35HB | 0.20％ |
| Example 4 | 41HB | 0.70％ |
| Example 5 | 50HB | 0.80％ |
| Comparative example 1 | 10HB | 10％ |
| Comparative example 2 | 80HB | 15％ |
From the above table, when the hardness of the flexible protective film 3 is in the range of 20 HB-50 HB, the wrinkling rate of the battery pole piece is low, the pole piece is not easy to generate wrinkles and purple spots in the charging and discharging process of the battery, the cycle performance of the battery is better, and the quality of the battery is better.
Optionally, the flexible protection film 3 may be elastically deformed to be closely attached to the outer wall of the bare cell 1, and the elastic deformation amount of the flexible protection film 3 is 0.05 mm-1 mm.
Specifically, the flexible protective film 3 may be elastically deformed so as to be closely attached to the outer wall of the bare cell 1, and the elastic deformation amount of the flexible protective film 3 may be 0.05mm to 1mm, specifically, the elastic deformation amount may be set to 0.05mm, 0.08mm, 0.2mm, 0.6mm, 1mm, or the like. The elastic properties of the object have a certain limit beyond which the object is deformed and cannot be recovered, and this limit is called elastic deformation amount, and the larger the elastic deformation is, the larger the elastic force is, the elastic deformation is lost, and the elastic force is also lost. In this embodiment, the elastic deformation amount of the flexible protective film 3 is 0.05 mm-1 mm, and when the dimensional change of the bare cell 1 during expansion deformation is within the range, the protective film can be fully attached to the bare cell 1, so that a good binding force is generated to the bare cell 1. If the expansion degree of the bare cell 1 is small, the elastic deformation amount of the flexible protection film 3 is small, and normally the minimum deformation amount of the flexible protection film 3 is more than 0.05mm, if the expansion degree of the bare cell 1 is large, the elastic deformation amount of the flexible protection film 3 is also large, the deformation amount of the flexible protection film 3 is increased within 0.05 mm-1 mm, and when the deformation amount of the flexible protection film 3 exceeds 1mm, the flexible protection film 3 loses the restoration capability, so that the flexible protection film is kept at the deformation amount of more than 1mm, and the binding capability to the bare cell 1 is lost. In addition, the thickness of the flexible protective film 3 may be set to be between 0.5mm and 3mm, so that not only excellent elastic deformation capability can be ensured, but also excessive occupation of space in the housing 2 can be avoided, and it is noted that the measurement of elastic deformation amount can be performed by using the existing method for measuring elastic deformation amount of material, for example, a static stretching-optical lever amplifying method can be used for measurement.
Optionally, referring to fig. 2, the flexible protective film 3 is provided with a plurality of through holes 30 penetrating through the thickness of the flexible protective film 3, and an opening area of each through hole 30 is 60um 2～10000um2.
Specifically, as shown in fig. 2, a plurality of through holes 30 are formed in the flexible protection film 3, the through holes 30 penetrate through the flexible protection film 3 along the thickness direction of the flexible protection film 3, the through holes 30 may be formed in the side wall of the flexible protection film 3, and the through holes 30 may be formed in the upper surface, the lower surface and the side wall of the flexible protection film 3, so that free electrolyte may be absorbed by the through holes in the injection process of the bare cell 1. Specifically, the battery needs to be filled with electrolyte after packaging, namely electrolyte is filled into the battery from a reserved liquid filling port on the battery, free electrolyte possibly exists between the bare cell 1 and the shell 2 in the liquid filling process, and in the battery charging and discharging expansion process, the gap between the bare cell 1 and the shell 2 is reduced, so that the free electrolyte can enter the bare cell 1 from the through hole 30 of the flexible protection film 3, the liquid holding capacity of the battery is improved, and the charging and discharging performance of the battery is improved. Further, since the opening area of the through hole 30 is too large, if the opening area exceeds 10000um 2, the elastic deformation capability of the flexible protective film 3 can be affected, and if the opening area of the through hole 30 is too small, if the opening area is smaller than 60um 2, the through hole 30 is easy to be blocked in the process of absorbing electrolyte, therefore, the opening area of each through hole 30 on the flexible protective film 3 is 60um 2～10000um2, and preferably, the opening area of each through hole 30 is set to 60um 2、70um2、80um2, so that the flexible protective film 3 can be ensured to have better elastic deformation capability, and the flexible protective film 3 can be ensured to effectively absorb the free electrolyte in the shell 2. Further, the plurality of through holes 30 may be set to any one or more forms such as a circular hole, an oval hole, a square hole, a polygonal hole, etc., and preferably, the embodiment sets the plurality of through holes 30 to be hexagonal holes, that is, to be honeycomb holes, the hole pattern structure of the through holes may increase the stability of the flexible protection film 3, and avoid the local excessive deformation occurring when the flexible protection film 3 is deformed, to cause the tearing or damage of the flexible protection film 3, etc., and it should be noted that the opening area of each through hole 30 may be calculated according to the shape of the through hole by using an area formula, and if the through hole is circular, the opening area of the through hole may be calculated by using the area formula of the circle.
Optionally, the porosity of the flexible protective film 3 is 50% -90%.
Specifically, the porosity of the flexible protection film 3 is 50% -90%, the porosity refers to the percentage of the pore volume in the bulk material and the total volume of the material in a natural state, if the porosity of the flexible protection film 3 is 50%, the binding force of the flexible protection film 3 to the bare cell 1 is strong, but the capability of absorbing free electrolyte is relatively weak, if the porosity of the flexible protection film 3 is 70%, the binding force of the flexible protection film 3 to the bare cell 1 and the capability of absorbing free electrolyte are relatively moderate, if the porosity of the flexible protection film 3 is 90%, the binding force of the flexible protection film 3 to the bare cell 1 is weak, but the capability of absorbing free electrolyte is relatively strong, and a person skilled in the art can freely set the porosity of the flexible protection film 3 according to actual needs, so that the embodiment is not limited. In one embodiment, the processing of the plurality of through holes 30 is completed at one time in a state where the flexible protective film 3 is laid flat, and after the processing is completed, the flexible protective film 3 with the through holes 30 is directly coated on the surface of the bare cell 1, and the porosities of the upper surface, the lower surface and the side wall of the bare cell 1 processed and formed in this way are consistent. In another embodiment, the processing of the plurality of through holes 30 is completed in a split manner in a flat state of the flexible protection film 3, the porosities of the upper surface, the lower surface and the side wall of the die electric core 1 processed and formed in this manner may be inconsistent, the porosities of the lower surface and the side wall of the die electric core 1 may be set to be larger, the porosities of the upper surface are smaller, thus being more conducive to the absorption of the free electrolyte at the bottom and the side of the battery, it is noted that the porosities may be measured by using a measuring method such as a density method, a weighing method, a gas adsorption method, etc., wherein the measuring of the porosity a may refer to the measuring method for executing the porosities in the related art, and the embodiments of the application will not be described herein.
Alternatively, referring to fig. 2, a plurality of the through holes 30 are arranged in an array on the flexible protection film 3.
Specifically, the plurality of through holes 30 are arranged in an array on the flexible protection film 3, as shown in fig. 2, the plurality of through holes 30 are arranged in two rows and eleven columns on the upper surface of the flexible protection film 3, and of course, the specific arrangement is determined according to the surface dimensions of the bare cell 1, which is not limited in this embodiment. The through holes 30 are arranged in an array on the flexible protective film 3, so that the uniform stress of the flexible protective film 3 can be ensured, and the reliability of the constraint effect of the flexible protective film 3 on the bare cell 1 is improved.
Optionally, the thickness of the flexible protective film 3 is 0.5 mm-3 mm.
Specifically, the thickness of the flexible protection film 3 can be set according to the size specification of the bare cell 1, if the overall size of the bare cell 1 is smaller, the thickness of the flexible protection film 3 can be set to 0.5mm, if the overall size of the bare cell 1 is larger, the thickness of the flexible protection film 3 can be set to 3mm, that is, if the overall size of the bare cell 1 is smaller, the thickness of the flexible protection film 3 can be set to be smaller, the cost control is facilitated, the lightweight design of the battery is realized, if the overall size of the bare cell 1 is larger, the thickness of the flexible protection film 3 can be set to be larger, so that the better binding force of the flexible protection film 3 to the bare cell 1 is ensured, the flexible protection film 3 is prevented from tearing when the bare cell 1 is expanded, and the thickness of the flexible protection film 3 can be measured by a vernier caliper or a micrometer, and the thickness of the flexible protection film 3 at a plurality of positions can be measured, and the average value is calculated.
Alternatively, the flexible protective film 3 is a silicone rubber foam film, a polyimide foam film, or a polyurethane flexible foam film.
Specifically, the silicone rubber foam material, the polyimide foam film and the polyurethane soft foam film are used as a novel polymer foam system, and have excellent characteristics of flexibility, light weight, good compression rebound resilience and the like of the foam material, wherein the silicone rubber foam film maintains the characteristics of high and low temperature resistance, chemical stability and the like of the silicone rubber material; the polyimide foam film maintains the characteristics of polyimide such as high flame retardant level, good electrical insulation performance, ageing resistance and the like, and the performances cannot be changed obviously in a wider temperature range; the polyurethane soft foam film maintains the characteristics of good tensile strength, tear strength, wear resistance, hydrolysis resistance and the like of the polyurethane elastomer; the flexible protective film 3 is any one of a silicone rubber foam film, a polyimide foam film and a polyurethane flexible foam film, and can have excellent elastic deformation capability, so that the bare cell 1 is well bound.
Optionally, referring to fig. 1, the bare cell 1 has a tab 10, and the flexible protection film 3 has a hollowed portion; the hollowed-out part is used for penetrating through the tab 10 so that the tab 10 is exposed.
Specifically, as shown in fig. 1, the bare cell 1 has a tab 10, and electrical connection between the battery and an external charge and discharge device can be achieved through the tab 10, thereby performing a charge and discharge function of the battery. The tab 10 comprises a positive tab 10 and a negative tab 10, the flexible protection film 3 is provided with two hollow parts, the two hollow parts are respectively used for penetrating the positive tab 10 and the negative tab 10, and the tab 10 is exposed out of the flexible protection film after penetrating the hollow parts so as to be electrically connected with external charging and discharging equipment. The size of the hollowed-out part is determined according to the size of the tab 10 and is slightly larger than the tab 10, so that the tab 10 can pass through smoothly.
Optionally, referring to fig. 3, the battery further includes: a top cover sheet 4; the top cover sheet 4 covers the opening of the shell 2, and the flexible protective film 3 is in hot melt connection with the top cover sheet 4.
Specifically, as shown in fig. 3, the battery further includes a top cover plate 4, as in the foregoing embodiment, the casing 2 has a receiving cavity for receiving the bare cell 1, the bare cell 1 is placed in the receiving cavity, and the top cover plate 4 covers the opening of the casing 2, so that the receiving cavity is closed, and the protection effect is achieved on the bare cell 1 of the casing 2, so that moisture, dust and the like are prevented from entering the receiving cavity, and the service performance of the battery is affected. The flexible protective film 3 and the top cover sheet 4 are fixedly connected together in a hot melting mode, so that the connection reliability of the top cover sheet 4 and the shell 2 is ensured, and the durability of the battery is improved.
The utility model also provides a battery pack comprising the battery of any one of the preceding claims.
Specifically, the battery pack comprises the battery in any one of the embodiments, and the battery is simple in processing mode, so that fewer equipment or tools are required for producing the battery pack, and the production cost of the battery pack can be effectively controlled. Meanwhile, the battery quality is good, and wrinkling or purple spot phenomenon is not easy to occur in the charging and discharging process, so that the safety performance of the battery pack is ensured.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
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 (10)
1. A battery, comprising:
a bare cell (1);
a housing (2) for accommodating the bare cell (1);
And the flexible protection film (3) is coated on the outer wall of the bare cell (1) and used for realizing insulation between the bare cell (1) and the shell (2), and the hardness of the flexible protection film (3) is 20 HB-50 HB.
2. The battery according to claim 1, wherein the flexible protective film (3) is elastically deformable to be closely attached to the outer wall of the bare cell (1), and the elastic deformation amount of the flexible protective film (3) is 0.05mm to 1mm.
3. The battery according to claim 1, wherein the flexible protective film (3) is provided with a plurality of through holes (30) penetrating through the thickness of the flexible protective film, and the opening area of each through hole (30) is 60um 2～10000um2.
4. A battery according to claim 3, characterized in that the porosity of the flexible protective film (3) is 50-90%.
5. A battery according to claim 3, characterized in that a plurality of the through holes (30) are arranged in an array on the flexible protection film (3).
6. The battery according to claim 1, characterized in that the thickness of the flexible protective film (3) is 0.5-3 mm.
7. The battery according to claim 1, wherein the flexible protection film (3) is a silicone rubber foam film, a polyimide foam film, or a polyurethane soft foam film.
8. The battery according to claim 1, characterized in that the bare cell (1) has a tab (10), and the flexible protective film (3) has a hollowed-out portion;
The hollowed-out part is used for penetrating through the lug (10) so that the lug (10) is exposed out of the flexible protective film (3).
9. The battery of claim 8, further comprising: a top cover sheet (4);
The top cover sheet (4) covers the opening of the shell, and the flexible protection film (3) is connected with the top cover sheet (4) in a hot melting mode.
10. A battery pack comprising the battery according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322436179.2U CN220873800U (en) | 2023-09-07 | 2023-09-07 | Battery and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322436179.2U CN220873800U (en) | 2023-09-07 | 2023-09-07 | Battery and battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN220873800U true CN220873800U (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322436179.2U Active CN220873800U (en) | 2023-09-07 | 2023-09-07 | Battery and battery pack |
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| Country | Link |
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| CN (1) | CN220873800U (en) |
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