CN116706350B - Secondary battery, battery module and electric equipment - Google Patents

Secondary battery, battery module and electric equipment Download PDF

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Publication number
CN116706350B
CN116706350B CN202310981364.1A CN202310981364A CN116706350B CN 116706350 B CN116706350 B CN 116706350B CN 202310981364 A CN202310981364 A CN 202310981364A CN 116706350 B CN116706350 B CN 116706350B
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CN
China
Prior art keywords
groove
secondary battery
rectangular
bottom wall
film
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CN202310981364.1A
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Chinese (zh)
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CN116706350A (en
Inventor
陈志雄
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Shenzhen Haichen Energy Storage Control Technology Co ltd
Xiamen Hithium Energy Storage Technology Co Ltd
Original Assignee
Shenzhen Haichen Energy Storage Control Technology Co ltd
Xiamen Hithium Energy Storage Technology Co Ltd
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Priority to CN202310981364.1A priority Critical patent/CN116706350B/en
Publication of CN116706350A publication Critical patent/CN116706350A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • 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 application discloses a secondary battery, a battery module and electric equipment. The secondary battery comprises a shell and an outer coating film, wherein the shell is provided with a bottom wall, and a groove recessed towards the inside of the shell is formed in the bottom wall; the outer coating film is coated on the surface of the shell and comprises a bottom film, wherein the bottom film is coated on the bottom wall and covers at least part of the groove. The secondary battery can enable the outer coating film of the secondary battery to be easily torn, and is convenient for recycling the outer coating film, so that the recycling rate of the secondary battery is improved.

Description

Secondary battery, battery module and electric equipment
Technical Field
The application relates to the technical field of batteries, in particular to a secondary battery, a battery module and electric equipment.
Background
In the prior art, when the secondary battery after retired is recovered, materials such as lithium and nickel with high price are usually recovered, and parts of plastic materials such as lower plastic and an outer coating are usually crushed and burned, so that the recovery rate of the secondary battery is low, and popularization of the secondary battery in overseas markets is not facilitated, and therefore, how to improve the recovery rate of the secondary battery is a problem to be solved urgently.
Disclosure of Invention
The application discloses a secondary battery, a battery module and electric equipment, which can enable an outer coating film of the secondary battery to be easily torn, and facilitate recovery of the outer coating film, thereby improving the recovery rate of the secondary battery.
In order to achieve the above object, the present application discloses, in a first aspect, a secondary battery comprising:
a housing having a bottom wall provided with a groove recessed toward the inside of the housing;
the outer coating film is coated on the surface of the shell and comprises a bottom film, and the bottom film is coated on the bottom wall and covers at least part of the grooves.
In this embodiment, a groove recessed toward the inside of the casing is formed in the bottom wall of the casing, the bottom film is coated on the bottom wall and covers at least part of the groove, that is, the bottom film portion located at the groove is in a suspended state, so that when the retired secondary battery is recovered, the bottom film covered on the groove can be pressed or punched by a sharper tool, so that the bottom film can be broken or poked easily, and a tearing opening or tearing crack capable of being torn is formed in the bottom film, so that the outer envelope can be torn off from the casing easily by taking the tearing opening as a tearing point, thereby facilitating recovery of the outer envelope, and ensuring that recovery of the outer envelope has higher efficiency; compared with the recycling modes of crushing, burning and the like of the outer coating film on the secondary battery, the method can recycle the outer coating film, and effectively improves the recycling rate of the secondary battery.
In a possible implementation manner of the first aspect, a protruding member is disposed on a bottom wall of the groove, the protruding member has an end face that is flush with an outer wall surface of the bottom wall, which faces the outer side of the housing, a transition portion is disposed between the end face of the protruding member and a peripheral side wall of the protruding member, an avoidance hole is disposed on the bottom film, the protruding member is disposed in the avoidance hole in a penetrating manner, and the transition portion is disposed in the avoidance hole, and at least a portion of a hole edge of the avoidance hole is connected with the transition portion.
Through the bulge that sets up on the diapire of recess wears to locate in dodging the hole, can make the outer envelope when the cladding is on the shell, the accessible dodges the hole cover and establishes on the bulge and fix a position outer envelope, has improved outer envelope's assembly efficiency, simultaneously, still can make outer envelope's assembly have higher precision.
In a possible implementation manner of the first aspect, the transition portion is an arc transition portion, and a radius of the arc transition portion is r, where r is equal to or less than 0.2mm and equal to or less than 0.5mm.
Therefore, the radius of the arc transition part is between 0.2mm and 0.5mm, so that the distance between the transition part and the groove side wall of the groove is not easy to be excessively large, and the situation that the bottom film is recessed into the groove at the position of the groove due to the excessively large distance between the transition part and the groove side wall of the groove is prevented; the distance between the transition part and the groove side wall of the groove is not easy to be excessively small, and the part of the bottom film, which is positioned at the edge of the hole at the avoidance hole, is prevented from being positioned at the position of the transition part, which is close to the end surface of the protruding piece, so that the end surface of the protruding piece cannot protrude out of the plane where the bottom film is positioned.
In a possible implementation manner of the first aspect, the transition portion is disposed around a circumference of the end surface, an opening is disposed on a side, facing away from the bottom wall of the groove, the bottom film is further covered on the opening in a sealing manner, and at least part of hole edges of the avoidance holes are bonded with the transition portion.
Through the setting of a week of terminal surface is encircleed to the transition portion, can make the portion that is located the hole edge of dodging the hole of bottom membrane all can be connected with the transition portion for the connection between bottom membrane and the transition portion can be comparatively firm stable, and prevents that the bottom membrane portion that is located the recess department from being sunken effect to the recess in better.
In a possible implementation manner of the first aspect, a space is provided between a peripheral side wall of the protruding member and a groove side wall of the groove, the protruding member is a rectangular protruding member, the groove is a rectangular groove, a central axis of the rectangular protruding member coincides with a central axis of the rectangular groove, and a length direction of the rectangular protruding member is parallel to a length direction of the rectangular groove.
Therefore, the cross section of the protruding piece and the cross section of the groove are concentric rectangles, so that when the outer envelope is torn, the outer envelope part positioned on any side of the protruding piece can be pressed, the outer envelope can be conveniently torn, and the bottom film parts positioned on the front, back, left and right of the protruding piece can be broken and cracked, namely the bottom film can be cracked into four parts, so that when the outer envelope is torn, any part can be used as the tearing starting point for tearing, and the tearing efficiency of the outer envelope is effectively improved.
In a possible implementation manner of the first aspect, the bottom wall is a rectangular bottom wall, the central axis of the rectangular protruding member is further coincident with the central axis of the rectangular bottom wall, and the length direction of the rectangular protruding member is parallel to the length direction of the rectangular bottom wall.
Therefore, the cross section of the protruding piece and the plate surface of the bottom wall can be concentric rectangles, the avoidance holes can be set to be rectangles corresponding to the protruding piece, when the outer envelopes are cut at the same time, the distances between the avoidance holes on the adjacent outer envelopes are the same, the cutting paths of the outer envelopes can be approximately the same, and the outer envelopes can be conveniently cut.
In a possible implementation manner of the first aspect, the avoidance hole is a rectangular hole, and the bottom film is provided with an easy-tearing part at a joint of at least one group of two adjacent hole edges of the rectangular hole.
Therefore, when the bottom film part positioned at the groove position is pressed or poked, the bottom film is easy to form tearing seams at two adjacent hole edges of the rectangular hole, the bottom film can be torn off with small force, and other parts of the outer coating film are torn off from the shell, so that the outer coating film is time-saving and labor-saving to tear and recycle.
In a possible implementation manner of the first aspect, the tear-off portion includes a score line, or the tear-off portion includes a plurality of through holes that are sequentially arranged at intervals along a direction from the avoidance hole to an edge of the outer wrapping film.
Therefore, the easy-to-tear part can be manufactured together when the avoiding hole is cut, so that the outer wrapping film is easy to tear and recover, and meanwhile, the manufacturing difficulty of the outer wrapping film is simplified.
In a possible implementation manner of the first aspect, the secondary battery further includes a bare cell, the housing has a receiving cavity, and the bare cell is received in the receiving cavity;
the one side of diapire orientation hold the chamber and be provided with the supporting bulge, the supporting bulge is used for supporting bare cell, the supporting bulge with the recess is corresponding to be set up.
Through setting up the supporting bulge in the orientation of diapire holds the one side of chamber to be used for supporting naked electric core, not only can improve the structural strength of diapire, can also make naked electric core be difficult for appearing rocking the condition in holding the chamber, avoided rocking the condition that leads to the short circuit because of naked electric core in holding the chamber.
In a possible implementation manner of the first aspect, the outer wrapping film further includes a main body, the main body is wrapped on other surfaces of the housing except the bottom wall, and the bottom film is further provided with a tear line, and/or the main body is provided with a tear line;
the easy tear line includes the nick line, perhaps, easy tear line includes a plurality of through-holes of interval arrangement in proper order.
Therefore, the outer envelope can be provided with a plurality of tearing starting points, so that the outer envelope is greatly convenient to tear, and when the outer envelope is torn, the outer envelope can be quickly torn down along the easy-to-tear line, and the tearing and recycling efficiency of the outer envelope is effectively improved.
In a second aspect, the application also discloses a battery module, which is characterized by comprising a plurality of secondary batteries according to any one of the first aspects.
In the present embodiment, the secondary battery in the battery module is the secondary battery of any one of the above-described first aspects, and therefore, the secondary battery in the present embodiment has the technical effect of the secondary battery in the first aspect.
In a third aspect, the application also discloses electric equipment, which is characterized by comprising the battery module set in the second aspect.
In this embodiment, the battery module in the electric device is any one of the battery modules in the second aspect, so the battery module in this embodiment has the technical effects of the battery module in the second aspect, and the technical effects of the battery module in the second aspect are fully described, which is not repeated here. And the secondary battery in the battery module of the second aspect is the secondary battery of any one of the first aspects described above, the secondary battery in the present embodiment has the technical effects of the secondary battery in the first aspect described above.
Compared with the prior art, the application has the beneficial effects that:
according to the application, the bottom wall of the shell is provided with the concave groove which is concave towards the inside of the shell, the bottom film is coated on the bottom wall and covers at least part of the concave groove, namely, the bottom film part at the position of the concave groove is in a suspension state, so that when the retired secondary battery is recovered, the bottom film covered on the concave groove can be pressed or is punched or poked by a sharper tool, the bottom film can be easily broken or poked, and a tearing opening or tearing crack which can be torn is formed on the bottom film, so that the outer envelope can be easily torn off from the shell by taking the tearing opening as a tearing point, the recovery of the outer envelope is facilitated, and the recovery of the outer envelope has higher efficiency; compared with the recycling modes of crushing, burning and the like of the outer coating film on the secondary battery, the method can recycle the outer coating film, and effectively improves the recycling rate of the secondary battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and 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 secondary battery provided in an embodiment of the present application;
fig. 2 is a partial sectional view of a secondary battery according to an embodiment of the present application;
fig. 3 is a plan view of a secondary battery according to an embodiment of the present application;
FIG. 4 is an enlarged view of FIG. 2 at position A;
fig. 5 is a schematic structural diagram of an unfolded outer wrapping film according to an embodiment of the present application;
FIG. 6 is a schematic view of another exemplary outer film according to an embodiment of the present application after being unfolded;
fig. 7 is an exploded view of a secondary battery according to an embodiment of the present application;
fig. 8 is a perspective view of a battery module according to an embodiment of the present application.
Reference numerals illustrate:
1-a housing; 11-a bottom wall; 111-grooves; 112-a projection; 1121-transition; 1122-end face; 113-supporting protrusions; 2-coating; 21-a bottom film; 211-avoiding holes; 212-an easy-to-tear portion; 22-a body; 23-an easy-to-tear line; 3-a top cap assembly; 31-top cover; 4-bare cell;
100-battery module; 10-secondary battery.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present application, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The application discloses a secondary battery, a battery module and electric equipment, which can enable an outer coating film of the secondary battery to be easily torn, and facilitate recovery of the outer coating film, thereby improving the recovery rate of the secondary battery.
The technical scheme of the application will be further described with reference to specific embodiments and drawings.
Example 1
This embodiment provides a secondary battery, as shown in fig. 1 to 4, comprising a case 1 and an outer envelope 2. Wherein the housing 1 has a bottom wall 11, and the bottom wall 11 is provided with a groove 111 recessed toward the inside of the housing 1; the outer envelope 2 is coated on the surface of the casing 1, and comprises a bottom film 21, wherein the bottom film 21 is coated on the bottom wall 11 and covers at least part of the groove 111.
In this embodiment, the bottom wall 11 of the casing 1 is provided with a groove 111 recessed toward the inside of the casing 1, the bottom film 21 is coated on the bottom wall 11 and covers at least part of the groove 111, that is, the bottom film 21 at the position of the groove 111 is in a suspended state, so that when the retired secondary battery 10 is recovered, the bottom film 21 covered on the groove 111 can be pressed or pierced with a sharper tool, so that the bottom film 21 can be broken or poked more easily, and a tearing opening or tearing crack capable of being torn is formed on the bottom film 21, so that the outer envelope 2 can be torn off from the casing 1 more easily by taking the tearing opening as a tearing point, thereby facilitating recovery of the outer envelope 2 and enabling recovery of the outer envelope 2 to have higher efficiency; and compared with the recycling mode of crushing, burning and the like of the outer coating film 2 on the secondary battery 10, the outer coating film 2 can be recycled, and the recycling rate of the secondary battery 10 is effectively improved.
The bottom film 21 covers at least part of the groove 111, or the bottom film 21 covers the groove 111 completely, or the bottom film 21 only covers part of the groove 111, at this time, the bottom film 21 may have a notch at the position of the groove 111, and when the outer envelope 2 is recovered, the bottom film 21 may be pulled by pinching or holding the edge portion of the bottom film 21 at the notch position, so that the bottom film 21 is torn, and further other portions of the outer envelope 2 are torn off from the casing 1, so that the operation of tearing and recovering the outer envelope 2 is simple and convenient.
The bottom wall 11 is provided with the groove 111 recessed into the housing 1, and the groove 111 may be formed by injection molding together with other parts of the housing 1 by a mold, or the bottom wall 11 of the housing 1 may be processed after the housing 1 is formed, which is not limited herein.
Alternatively, as shown in fig. 2 to 5, a protruding member 112 is provided on the bottom wall of the groove 111, the protruding member 112 has an end face 1122 flush with the outer wall surface of the bottom wall 11 facing the outside of the housing 1, a transition portion 1121 is provided between the end face 1122 of the protruding member 112 and the peripheral side wall of the protruding member 112, a relief hole 211 is provided on the bottom film 21, the protruding member 112 is inserted into the relief hole 211, the transition portion 1121 is located in the relief hole 211, and at least part of the hole edge of the relief hole 211 is connected to the transition portion 1121.
From this, wear to locate in dodging the hole 211 through setting up the bulge 112 on the groove diapire of recess 111, can make outer envelope 2 when cladding on shell 1, accessible dodges the hole 211 cover and establish and fix a position outer envelope 2 on bulge 112, improved outer envelope 2's assembly efficiency, simultaneously, still can make outer envelope 2's assembly have higher precision.
And, the transition portion 1121 of the protrusion 112 is located in the escape hole 211, and at least a portion of the hole edge of the escape hole 211 is connected with the transition portion 1121, so that the portion of the bottom film 21 at the position of the groove 111 is prevented from being depressed by gravity, so that the exterior coating film 2 can be tightly coated on the outer case 1 of the secondary battery 10.
Wherein, the protrusion 112 has the end surface 1122 flush with the outer wall surface of the bottom wall 11 facing the outside of the case 1, so that one side of the bottom wall 11 of the case 1 has a smoother appearance, and the placement of the secondary battery 10 can be smoother.
The protruding member 112 may be a bump provided on the bottom wall of the groove 111, for example, a bump welded or adhered to the bottom wall of the groove 111; alternatively, the protruding member 112 may have the same structure as the other portion of the bottom wall 11, and the recess 111 may be an annular recess 111 surrounding the protruding member 112 during molding of the housing 1; of course, the protruding member 112 may have other structures, which are not limited herein.
When the edge of the bottom film 21 at the position of the avoiding hole 211 is connected with the transition part 1121, the bottom film 21 and the transition part 1121 can be in adhesive connection, so that the operation is convenient and simple.
The transition portion 1121 may have various implementations, for example, the transition portion 1121 may be an inclined surface connected between the end surface 1122 of the protruding member 112 and the peripheral side wall of the protruding member 112, or the transition portion 1121 may be an arc surface connected between the end surface 1122 and the peripheral side wall of the protruding member 112, which is not limited, so long as the portion of the bottom film 21 located at the hole edge of the avoiding hole 211 is easily connected to the avoiding hole 211.
Alternatively, when the transition portion 1121 is an arc surface connected between the end face 1122 and the peripheral side wall of the protruding member 112, the transition portion 1121 may be an arc transition portion having a radius r of 0.2 mm.ltoreq.r.ltoreq.0.5 mm.
Therefore, the arc transition part is easy to process and realize, and the manufacturing difficulty of the shell 1 is reduced. In addition, the radius of the arc transition part is between 0.2mm and 0.5mm, so that the distance between the transition part 1121 and the groove side wall of the groove 111 is not easy to be excessively large, and the situation that the bottom film 21 is recessed into the groove 111 at the position of the groove 111 due to the excessively large distance between the transition part 1121 and the groove side wall of the groove 111 is prevented; the distance between the transition portion 1121 and the groove side wall of the groove 111 is not easy to be too small, and the problem that the portion of the hole edge of the bottom film 21 located at the avoiding hole 211 is located at the position of the end face 1122 of the transition portion 1121 near the protruding member 112 due to the too small distance between the transition portion 1121 and the groove side wall of the groove 111 is avoided, so that the positioning effect of the protruding member 112 on the outer envelope 2 is prevented from being reduced because the end face 1122 of the protruding member 112 cannot protrude from the plane of the bottom film 21.
When the radius of the arc transition portion is smaller than 0.2mm, the distance between the transition portion 1121 and the groove side wall of the groove 111 is smaller, which easily causes that the portion of the hole edge of the bottom film 21 located at the relief hole 211 is located at the position of the transition portion 1121 near the end face 1122 of the protruding member 112, so that the end face 1122 of the protruding member 112 cannot pass through the relief hole 211, and the positioning effect of the protruding member 112 on the outer envelope 2 is reduced.
When the radius of the arc transition portion is greater than 0.5mm, the distance between the transition portion 1121 and the groove side wall of the groove 111 is easily caused to be larger, so that the area of the portion of the bottom film 21 located on the groove 111 is larger, under the action of gravity, the portion of the bottom film 21 covered on the groove 111 is easily recessed into the groove 111, connection between the bottom film 21 and the transition portion 1121 is not facilitated, and connection difficulty between the bottom film 21 and the transition portion 1121 is increased.
Optionally, the transition portion 1121 is disposed around a circumference of the end surface 1122, an opening is disposed on a side of the groove 111 facing away from the bottom wall of the groove, and the bottom film 21 is further sealed and covered on the opening, so that at least part of the hole edge of the avoiding hole 211 is bonded to the transition portion 1121.
Thus, foreign matter is effectively prevented from falling into the groove 111 by the bottom film 21 being hermetically covered on the groove 111, occurrence of short circuit due to the foreign matter falling into the groove 111 is prevented, and safety of the secondary battery 10 is improved.
Moreover, the transition portion 1121 surrounds the circumference of the end face 1122, so that the portion of the bottom film 21 located at the hole edge of the avoidance hole 211 can be connected with the transition portion 1121, so that the connection between the bottom film 21 and the transition portion 1121 can be relatively firm and stable, and the effect of preventing the portion of the bottom film 21 located at the groove 111 from sinking into the groove 111 is better.
The bottom film 21 is bonded to the transition 1121, effectively improving the firm stability of the connection between the bottom film 21 and the transition 1121. And the adhesion between the bottom film 21 and the transition film may be that glue is coated on the transition portion 1121 or the bottom film 21, and the hole edge portion of the bottom film 21 located at the avoidance hole 211 is connected with the transition portion 1121; the outer film 2 may also be a heat-shrinkable film including a plurality of polyethylene terephthalate layers and a glue layer, that is, the bottom film 21 is a heat-shrinkable film including a plurality of polyethylene terephthalate layers and a glue layer, when the outer film 2 is coated on the casing 1 and the outer film 2 is heated and shrunk, the hole edge portion of the bottom film 21 located at the avoiding hole 211 may be melted by heat, so that glue at the hole edge may overflow, so that the hole edge portion of the bottom film 21 located at the avoiding hole 211 is adhered to the transition portion 1121, without additional glue coating and in the process of coating the outer film 2 on the casing 1, that is, the bottom film 21 and the transition portion 1121 may be connected, with simple operation and cost saving.
Wherein, the outer coating film 2 can be the thermal shrinkage film including two layers of polyethylene terephthalate and two layers of glue layers, can make the thickness of outer coating film 2 be difficult too thick simultaneously, can also make outer coating film 2 have better ductility to have better protective effect to secondary cell 10, and when outer coating film 2 easily tears, retrieves, can also make outer coating film 2 be difficult for being hooked or the condition that holds and split to appear because of the accident.
At least part of the hole edge of the escape hole 211 is bonded to the transition portion 1121, and part of the hole edge of the escape hole 211 may be bonded to the transition portion 1121, or all of the hole edge of the escape hole 211 may be connected to the transition portion 1121, which is not limited herein.
The bottom wall of the groove 111 is provided with the protruding member 112, and a space may be provided between the peripheral side wall of the protruding member 112 and the groove side wall of the groove 111, or a portion of the peripheral side wall of the protruding member 112 may contact with the groove side wall of the groove 111, which may enable the bottom film 21 to be suspended above the groove 111 and be connected with the transition portion 1121 of the protruding member 112, so as to facilitate the tearing of the outer envelope 2, which is not limited herein.
The cross-section of the protruding member 112 may have various shapes, such as rectangular, circular, oval, etc., and is not limited thereto. The recess 111 may have various shapes, such as rectangular, circular, elliptical, etc., and is not limited thereto. Wherein, when the cross-sectional shape of the protruding member 112 is rectangular, the protruding member 112 may be a rectangular protruding member 112.
Alternatively, as shown in fig. 2 to 4, a space is provided between the peripheral side wall of the protruding member 112 and the groove side wall of the groove 111, the protruding member 112 is a rectangular protruding member, the groove 111 is a rectangular groove, the central axis of the rectangular protruding member coincides with the central axis of the rectangular groove, and the length direction of the rectangular protruding member is parallel to the length direction of the rectangular groove.
Therefore, the cross section of the protruding piece 112 and the cross section of the groove 111 can be concentric rectangles, the long side of the protruding piece 112 can be correspondingly arranged with the long side of the groove 111, the short side of the protruding piece 112 can be correspondingly arranged with the short side of the groove 111, so that when the outer wrapping film 2 is torn, the outer wrapping film 2 part positioned on any side of the protruding piece 112 can be pressed, the outer wrapping film 2 can be conveniently torn, the bottom film 21 parts positioned on the front, the back, the left and the right of the protruding piece 112 can be broken and cracked, namely, the bottom film 21 can be cracked into four parts, any part can be used as a tearing point when the outer wrapping film 2 is torn, and the tearing efficiency of the outer wrapping film 2 is effectively improved.
As shown in fig. 1 to 4, the bottom wall 11 is a rectangular bottom wall, the central axis of the rectangular protruding member is also coincident with the central axis of the rectangular bottom wall, and the length direction of the rectangular protruding member is parallel to the length direction of the rectangular bottom wall.
Therefore, the cross section of the protruding member 112 and the plate surface of the bottom wall 11 can be made to be concentric rectangles, and the long side of the cross section of the protruding member 112 corresponds to and is parallel to the long side of the bottom wall 11, and the short side of the cross section of the protruding member 112 corresponds to and is parallel to the short side of the bottom wall 11, so that the avoiding holes 211 can be set to be rectangles corresponding to the protruding member 112, when a plurality of outer envelopes 2 are cut at the same time, the distances between the avoiding holes 211 on the adjacent outer envelopes 2 can be made to be the same, the cutting paths of each outer envelope 2 can be approximately the same, and the cutting of the outer envelopes 2 is facilitated.
For example, as shown in fig. 5, the outer film 2 is a schematic structure after being unfolded, and the shape of the outer film is regular and symmetrical. When the outer coating films 2 are cut, the outer coating films 2 can be heat-shrinkable films, at this time, the edge of each outer coating film 2 and the avoiding holes 211 on the outer coating films 2 can be cut out in sequence on one heat-shrinkable film with larger area, and the moving distance of the cutting knife between any two adjacent outer coating films 2 can be the same as the distance between the avoiding holes 211 on two adjacent outer coating films 2, so that the cutting difficulty of the outer coating films 2 is greatly reduced, and the manufacturing efficiency of the outer coating films 2 is improved.
Moreover, when the avoiding holes 211 on the bottom film 21 can be rectangular holes, the outer envelope 2 is shrunk and coated on the outer shell 1 by heating, so that the shrinkage of the outer envelope 2 coated on the outer shell 1 is consistent, and the outer envelope 2 coated on the outer shell 1 and the connection between the bottom film 21 and the protruding piece 112 are consistent.
In addition, the central axis of rectangular protruding piece still coincides with the central axis of rectangular recess, and the length direction of rectangular protruding piece still parallels with the length direction of rectangular recess, can make the cross section of recess 111 and the face of diapire 11 be concentric rectangle, the long limit of recess 111 and the corresponding setting of long limit of diapire 11 and parallel each other, the minor face of recess 111 and the minor face of diapire 11 set up corresponding setting and parallel each other, can make the shape of the mould of the shell 1 of preparation secondary cell 10 comparatively regular, simply, do benefit to the preparation of mould and the injection moulding of shell 1, simultaneously, can also make the atress of shell 1 comparatively even, the structural strength of shell 1 has been improved.
Alternatively, as shown in fig. 6, the avoiding hole 211 is a rectangular hole, and the bottom film 21 is provided with a tear-off portion 212 at the connection between at least one group of two adjacent hole sides of the rectangular hole.
Therefore, when the bottom film 21 part located at the position of the groove 111 is pressed or poked, the bottom film 21 is easy to form tearing seams at two adjacent hole edges of the rectangular hole, the bottom film 21 can be torn off by using smaller force, and then other parts of the outer coating film 2 are torn off from the shell 1, so that time and labor are saved in tearing and recycling of the outer coating film 2, the outer coating film 2 is torn off and recycled more simply and rapidly, and the recycling efficiency of the outer coating film 2 is greatly improved.
The bottom film 21 is provided with the easy-tearing portion 212 at the connection position of at least one group of two adjacent hole edges of the rectangular holes, may be provided at the connection position of the hole edges of one group of two adjacent rectangular holes, may be provided at the connection position of the hole edges of two groups of two adjacent rectangular holes, or may be provided at the connection position of the hole edges of three groups or four groups of two adjacent rectangular holes, and is not limited herein.
In addition, the easy-to-tear portion 212 may extend to other positions of the outer envelope 2, for example, to other edges of the outer envelope 2, so that when the outer envelope 2 is torn, the outer envelope 2 may be torn off from the outer casing 1 along the easy-to-tear portion 212, so that the outer envelope 2 is more easily torn off.
Alternatively, as shown in fig. 6, the tear-off portion 212 may include a score line, or the tear-off portion may include a plurality of through holes that are sequentially spaced apart in a direction from the escape hole 211 toward the edge of the outer envelope 2. From this, the structure of easy tear portion 212 is comparatively simple for easy tear portion 212 can together make when cutting dodge hole 211, when making outer envelope 2 more easily by tearing, retrieve, still simplified the preparation degree of difficulty of outer envelope 2.
The shape of the through hole may be circular, square, oval or other special-shaped, which is not limited herein.
Of course, the tearable portion 212 may be a semicircular or oval notch formed on the bottom film 21 at a connection position of at least one set of two adjacent hole sides of the rectangular hole, and the notch may be in communication with the rectangular hole, which is not limited herein.
In some embodiments, as shown in fig. 1, 2 and 7, the secondary battery 10 further includes a bare cell 4, the case 1 has a receiving cavity in which the bare cell 4 is received; the side of the bottom wall 11 facing the accommodating cavity is provided with a supporting protrusion 113, the supporting protrusion 113 is used for supporting the bare cell 4, and the supporting protrusion 113 is arranged corresponding to the groove 111.
From this, through setting up supporting bulge 113 in the orientation of diapire 11 holds the one side of chamber to be used for supporting naked electric core 4, not only can improve the structural strength of diapire 11, can also make naked electric core 4 be difficult for appearing the condition of rocking in holding the chamber, avoided because of naked electric core 4 rocks in holding the chamber and lead to the condition of short circuit.
In addition, the supporting protrusions 113 are arranged corresponding to the grooves 111, so that the structure of the housing 1 is simplified, the supporting protrusions 113 can be formed on one surface of the bottom wall 11 facing the accommodating cavity when the grooves 111 are arranged, and the manufacturing steps of the housing 1 are simplified, so that the housing 1 is easy to manufacture and realize, and the cost is reduced.
Optionally, as shown in fig. 5 and 6, the outer wrapping film 2 further includes a main body 22, where the main body 22 is wrapped on other surfaces of the casing 1 except the bottom wall 11, and the bottom film 21 is further provided with a tear line 23, and/or the main body 22 is provided with a tear line 23; the easy-to-tear line 23 includes a score line, or, the easy-to-tear line 23 includes a plurality of through holes arranged at intervals in sequence.
From this, can make outer coating film 2 can have a plurality of starting tear points, make things convenient for outer coating film 2's tearing greatly, and when outer coating film 2 tears, can tear down fast along easily tearing line 23, effectively improved outer coating tear, recovery efficiency. And the easy-to-tear line 23 has a simple structure and is easy to manufacture and realize.
In other embodiments, the thickness of the housing 1 is d,0.15 mm.ltoreq.d.ltoreq.0.35 mm.
Therefore, the thickness of the casing 1 is between 0.15mm and 0.35mm, so that the casing 1 has better structural strength, is not easy to be impacted and deformed, and can not cause the thickness of the casing 1 to be thicker so as to cause the weight of the casing 1 to be heavier, thereby reducing the cost and being beneficial to the light and thin design of the secondary battery 10.
When the thickness of the case 1 is less than 0.15mm, although the weight of the case 1 can be made lighter, the structural strength of the case 1 having a thinner thickness is poor, resulting in easy deformation of the case 1 upon impact, concave deformation of the bare cell 4 located in the case 1, and the like, which are disadvantageous in improvement of the safety of the secondary battery 10.
When the thickness of the case 1 is greater than 0.35mm, although the case 1 can be made to have superior structural strength, the case 1 having a thicker thickness may result in a larger weight of the case 1, resulting in a less portable secondary battery 10 and higher cost, which is disadvantageous in the slim design of the secondary battery 10.
The thickness of the housing 1 may be any of 0.15mm, 0.2mm, 0.25mm, 0.35mm, and the like, and is not limited thereto.
Optionally, the secondary battery 10 further includes a top cover assembly 3, an opening communicating with the accommodating cavity is disposed on the housing 1, the opening is located at a position opposite to the bottom wall 11 on the housing 1, the top cover assembly 3 is sealed to cover the opening, the top cover assembly 3 includes a top cover 31, the outer coating film 2 is coated on the housing 1, and the outer coating film 2 is further coated at a position of a peripheral edge of one surface of the top cover 31 facing away from the housing 1, so that the protection effect of the outer coating film 2 on the secondary battery 10 is better.
Example two
The present embodiment also provides a battery module including a plurality of the secondary batteries 10 according to any one of the above embodiments, as shown in fig. 8.
In the present embodiment, the secondary battery 10 in the battery module 100 is the secondary battery 10 of any one of the above-described embodiments, and therefore, the secondary battery 10 in the present embodiment has the technical effects of the secondary battery 10 in the first embodiment, and since the technical effects of the secondary battery 10 have been fully described in the first embodiment, the description thereof will not be repeated here.
Example III
The embodiment also provides electric equipment, which comprises the battery module in the second embodiment.
In this embodiment, the battery module 100 in the electric device is the battery module 100 in any of the second embodiments, so the battery module 100 in this embodiment has the technical effects of the battery module 100 in the second embodiment, and the technical effects of the battery module 100 in the second embodiment are fully described, which is not repeated here. The secondary battery 10 in the battery module 100 according to the second embodiment is the secondary battery 10 according to any one of the first embodiment, so the secondary battery 10 according to the present embodiment has the technical effects of the secondary battery 10 according to the first embodiment, and the technical effects of the secondary battery 10 according to the first embodiment are fully described, and will not be described here again.
The electric equipment can be any one of a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like, and is not limited herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (9)

1. A secondary battery, characterized by comprising:
a housing (1), wherein the housing (1) is provided with a bottom wall (11), and a groove (111) recessed towards the interior of the housing (1) is arranged on the bottom wall (11);
the outer coating film (2) is coated on the surface of the shell (1), the outer coating film (2) comprises a bottom film (21), and the bottom film (21) is coated on the bottom wall (11) and covers at least part of the grooves (111);
a protruding piece (112) is arranged on the bottom wall of the groove (111), the protruding piece (112) is provided with an end face (1122) which is flush with the outer wall surface of the bottom wall (11) facing the outer side of the shell (1), a transition part (1121) is arranged between the end face (1122) of the protruding piece (112) and the peripheral side wall of the protruding piece (112), a avoidance hole (211) is arranged on the bottom film (21), the protruding piece (112) is penetrated in the avoidance hole (211), the transition part (1121) is positioned in the avoidance hole (211), and at least part of the hole edge of the avoidance hole (211) is connected with the transition part (1121);
a space is reserved between the peripheral side wall of the protruding piece (112) and the groove side wall of the groove (111), the protruding piece (112) is a rectangular protruding piece, the groove (111) is a rectangular groove, the central axis of the rectangular protruding piece coincides with the central axis of the rectangular groove, and the length direction of the rectangular protruding piece is parallel to the length direction of the rectangular groove;
the avoidance hole (211) is a rectangular hole, and the bottom film (21) is provided with an easy-tearing part (212) at the joint of at least one group of two adjacent hole edges of the rectangular hole.
2. The secondary battery according to claim 1, wherein the transition portion (1121) is an arc transition portion having a radius r of 0.2mm r 0.5mm.
3. The secondary battery according to claim 1, wherein the transition portion (1121) is provided around a circumference of the end face (1122), an opening is provided on a side of the groove (111) facing away from the groove bottom wall, the bottom film (21) is further sealed over the opening, and at least part of the hole edge of the escape hole (211) is bonded to the transition portion (1121).
4. The secondary battery according to claim 1, wherein the bottom wall (11) is a rectangular bottom wall, the central axis of the rectangular protruding member further coincides with the central axis of the rectangular bottom wall, and the length direction of the rectangular protruding member is parallel to the length direction of the rectangular bottom wall.
5. The secondary battery according to claim 1, wherein the tearable portion (212) includes a score line, or the tearable portion (212) includes a plurality of through holes that are sequentially arranged at intervals in a direction from the escape hole (211) toward the edge of the outer envelope (2).
6. The secondary battery according to any one of claims 1 to 5, wherein the secondary battery (10) further comprises a bare cell (4), the case (1) having a housing cavity in which the bare cell (4) is housed;
one surface of the bottom wall (11) facing the accommodating cavity is provided with a supporting protrusion (113), the supporting protrusion (113) is used for supporting the bare cell (4), and the supporting protrusion (113) is arranged corresponding to the groove (111).
7. The secondary battery according to claim 6, wherein the outer wrapping film (2) further comprises a main body (22), the main body (22) is wrapped on other surfaces of the outer case (1) than the bottom wall (11), the bottom film (21) is further provided with a tear line (23), and/or the main body (22) is provided with a tear line (23);
the easy-to-tear line (23) comprises a score line, or the easy-to-tear line (23) comprises a plurality of through holes which are arranged at intervals in sequence.
8. A battery module characterized by comprising a plurality of secondary batteries (10) according to any one of claims 1 to 7.
9. A consumer comprising the battery module (100) of claim 8.
CN202310981364.1A 2023-08-07 2023-08-07 Secondary battery, battery module and electric equipment Active CN116706350B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2388846A1 (en) * 2010-05-20 2011-11-23 SB LiMotive Co., Ltd. Secondary battery
CN203326017U (en) * 2013-06-26 2013-12-04 宁德新能源科技有限公司 Treatment device for battery protective film
WO2018098900A1 (en) * 2016-11-29 2018-06-07 宇龙计算机通信科技(深圳)有限公司 Explosion-proof battery and battery device
CN215184227U (en) * 2021-06-01 2021-12-14 东莞新能德科技有限公司 Battery coating film, battery pack and electronic device
DE102021204034A1 (en) * 2021-04-22 2022-06-23 Vitesco Technologies Germany Gmbh Housing with a vent, battery and motor vehicle
CN218101574U (en) * 2022-07-22 2022-12-20 东莞华贝电子科技有限公司 Wrapping film, battery module and mobile terminal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2388846A1 (en) * 2010-05-20 2011-11-23 SB LiMotive Co., Ltd. Secondary battery
CN203326017U (en) * 2013-06-26 2013-12-04 宁德新能源科技有限公司 Treatment device for battery protective film
WO2018098900A1 (en) * 2016-11-29 2018-06-07 宇龙计算机通信科技(深圳)有限公司 Explosion-proof battery and battery device
DE102021204034A1 (en) * 2021-04-22 2022-06-23 Vitesco Technologies Germany Gmbh Housing with a vent, battery and motor vehicle
CN215184227U (en) * 2021-06-01 2021-12-14 东莞新能德科技有限公司 Battery coating film, battery pack and electronic device
CN218101574U (en) * 2022-07-22 2022-12-20 东莞华贝电子科技有限公司 Wrapping film, battery module and mobile terminal

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