CN112768783A

CN112768783A - Battery assembly, preparation method thereof and electronic equipment

Info

Publication number: CN112768783A
Application number: CN202110021843.XA
Authority: CN
Inventors: 谢红斌
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-05-07
Also published as: WO2022148129A1

Abstract

The application discloses a battery pack, a preparation method of the battery pack and electronic equipment. The first naked electric core of first encapsulation shell encapsulation to form encapsulation electric core. The naked electric core of second sets up with the encapsulation electricity core is adjacent. And the second packaging shell packages the second naked battery cell and the packaging battery cell. The battery pack, the preparation method of the battery pack and the electronic equipment can improve the capacity of the battery pack in a limited space.

Description

Battery assembly, preparation method thereof and electronic equipment

Technical Field

The application relates to the technical field of electronics, in particular to a battery pack, a preparation method of the battery pack and electronic equipment.

Background

Along with the increasing use rate of electronic devices, the power consumption of electronic devices is faster and faster, and along with the development of the lightness, thinness and miniaturization of electronic devices, how to improve the capacity of battery packs in limited space becomes a technical problem to be solved.

Disclosure of Invention

Provided are a battery pack that increases capacity in a limited space, a method of manufacturing the battery pack, and an electronic device having the battery pack.

In a first aspect, an embodiment of the present application provides a battery assembly, including:

a first bare cell;

a first encapsulation shell encapsulating the first bare cell to form an encapsulated cell;

a second bare cell disposed adjacent to the encapsulated cell; and

and the second packaging shell is used for packaging the second naked battery cell and the packaging battery cell.

In a second aspect, a method for manufacturing a battery assembly provided in an embodiment of the present application includes:

preparing a first naked battery cell and a first packaging shell, and forming a first punching pit on the first packaging shell; arranging the first naked electric core in the first punching pit;

injecting a first electrolyte into the first punching pit of the first packaging shell; sealing the first bare cell and the first electrolyte by the first packaging shell to form a packaged cell;

preparing a second naked battery cell and a second packaging shell, and forming a second punching pit on the second packaging shell; arranging the packaged electric core and the second naked electric core in the second punching pit;

injecting a second electrolyte into a second punching pit of the second packaging shell; sealing the packaged electric core, the second bare electric core and the second electrolyte by the second packaging shell;

a battery assembly is formed.

In a third aspect, a battery module provided in the embodiments of the present application is manufactured by the manufacturing method.

In a fourth aspect, an electronic device provided by an embodiment of the present application includes the battery assembly.

The battery pack that this application embodiment provided is through setting up the first naked electric core of first encapsulation shell encapsulation, forms the encapsulation electric core to through the naked electric core of second encapsulation shell encapsulation second and encapsulation electric core, so that seal between encapsulation electric core and the first naked electric core and encapsulate, reduce the space extravagant, improve the capacity of battery pack in the finite space.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 2 is an exploded schematic view of the electronic device shown in FIG. 1;

FIG. 3 is a schematic structural view of the battery assembly shown in FIG. 2;

FIG. 4 is a cross-sectional view of the first battery module shown in FIG. 3 taken along line A-A;

fig. 5 is a sectional view of the second battery module shown in fig. 3 taken along line a-a;

FIG. 6 is a schematic diagram of the rolled first die of FIG. 4 in an unrolled state;

FIG. 7 is a schematic diagram of another stacked first die shown in FIG. 4;

FIG. 8 is a schematic diagram of the rolled second die of FIG. 4 in an unrolled state;

fig. 9 is a schematic diagram of the packaged cell of fig. 4 removed from the second package casing;

fig. 10 is a first circuit block diagram for charging and discharging a battery assembly provided by an embodiment of the present application;

FIG. 11 is a block circuit diagram of an equalization module shown in FIG. 10;

fig. 12 is a second circuit block diagram for charging and discharging a battery pack according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a first second package according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a second package according to an embodiment of the present application;

fig. 15 is a schematic view of a first tab electrical connection of a packaged cell and an externally packaged cell provided in an embodiment of the present application in a stacked state;

fig. 16 is a schematic diagram of a second tab electrical connection of a packaged cell and an encapsulated cell provided in an embodiment of the present application in a stacked state;

fig. 17 is a flowchart of a method for manufacturing a battery pack according to an embodiment of the present disclosure;

fig. 18 is a third circuit block diagram for charging and discharging a battery pack according to an embodiment of the present application;

fig. 19 is a fourth circuit block diagram for charging and discharging a battery assembly according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The embodiments listed in the present application may be appropriately combined with each other.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present disclosure. The electronic device 100 may be a cellular phone, a smart phone, other wireless communication device, a personal digital assistant, an audio player, a music recorder, a video recorder, a camera, a battery charger, a mobile power supply, other media recorder, a radio, a medical device, a vehicle transportation device, a calculator, a programmable remote controller, a pager, a laptop computer, a desktop computer, a printer, a netbook computer, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a moving picture experts group (MPEG-1 or MPEG-2) audio layer (MP3) player, a wristwatch device, a pendant device, an earpiece device, or other compact portable device, a television, a tablet computer, a personal computer, a notebook computer, a wearable device, an electric vehicle, an airplane, or other rechargeable device. Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. In the present application, the electronic device 100 is taken as a mobile phone as an example, and those skilled in the art can easily think of structural design for other chargeable devices according to the technical means of the present embodiment.

For convenience of description, the illustration is defined with reference to the electronic device 100 being in the first viewing angle, the width direction of the electronic device 100 is defined as the X direction, the length direction of the electronic device 100 is defined as the Y direction, and the thickness direction of the electronic device 100 is defined as the Z direction. Wherein the direction in which the arrow points is the forward direction.

Referring to fig. 2, fig. 2 is an exploded schematic view of the electronic device shown in fig. 1. The electronic device 100 includes a battery assembly 10. The battery pack 10 is an internal battery or an external battery in the electronic device 100. The battery assembly 10 is a removable battery or a non-removable battery within the electronic device 100. In this embodiment, the electronic device 100 is a mobile phone. The electronic device 100 further includes a display 20, a middle frame 30, and a rear cover 40. The display screen 20, the middle frame 30 and the rear cover 40 are sequentially connected in a covering manner. The battery pack 10 is disposed between the middle frame 30 and the display screen 20, or between the middle frame 30 and the rear cover 40. The battery pack 10 is used to supply power to the display panel 20 and a main board or the like provided on the middle frame 30. It is to be understood that the present application provides a battery assembly 10 that includes, but is not limited to, a rechargeable battery or a non-rechargeable battery. In this embodiment, the battery pack 10 is a rechargeable battery.

The battery assembly 10 includes, but is not limited to, batteries of the types lithium ion, lithium metal, lithium-polymer, lead-acid, nickel-metal hydride, nickel-manganese-cobalt, lithium-sulfur, lithium-air, nickel-hydrogen, lithium ion, iron, nano, etc. In the embodiment of the present application, the battery pack 10 is exemplified as a lithium ion battery, and those skilled in the art can easily conceive of designing other types of batteries according to the technical means of the embodiment.

The shape of the battery assembly 10 is not particularly limited in the present application. Battery assembly 10 may be in the form of a column, a pouch, an arc, a soft pack square, a cylinder, a prismatic, or a profile, etc. In this embodiment, the battery module 10 is exemplified as a pouch-shaped rectangular battery.

Referring to fig. 3, fig. 3 is a schematic structural diagram of the battery assembly 10 shown in fig. 2. The battery assembly 10 includes a core assembly 101 and a protective plate 102. The cell assembly 101 is a charge and discharge core portion of the battery assembly 10. The core assembly 101 includes a first tab 101a and a second tab 101 b. The protection plate 102 is electrically connected to the first tab 101a and the second tab 101b of the electric core assembly 101, and cuts off a charging circuit or a discharging circuit of the electric core assembly 101 at an abnormal site such as charging, overdischarging, overcurrent, overtemperature, low temperature, etc. of the electric core assembly 101, and gives an alarm when an abnormality occurs.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of the electric core assembly 101 shown in fig. 3. Fig. 5 is a schematic structural view of another electric core assembly 101 shown in fig. 3. The electric core assembly 101 includes a first naked electric core 1, a first packaging shell 2, a second naked electric core 3 and a second packaging shell 4. Wherein, first encapsulation shell 2 is used for sealed first naked electric core 1 to form encapsulation electric core 1 a. The naked electric core 3 of second sets up with encapsulation electricity core 1a is adjacent. And the second naked battery cell 3 and the encapsulated battery cell 1a are encapsulated by a second encapsulating shell 4. For encapsulation electric core 1a and the naked electric core 3 of second stack the setting along the Z axle direction in fig. 4, for encapsulation electric core 1a and the naked electric core 3 of second set up side by side along the X axle direction in fig. 5.

Referring to fig. 6, the first bare cell 1 includes a first electrode group 11, at least one first diaphragm 12, and a first electrode group 13. Wherein, first naked electric core 1 includes but not limited to for lamination formula or coiling formula electricity core.

Referring to fig. 7, for the laminated core assembly 101, the first pole piece group 11 includes a plurality of first sub-pole pieces 111 and a plurality of second sub-pole pieces 112. The number of the first separators 12 is plural. This application does not do the restriction to the quantity of sub-pole piece or the number of piles of coiling, and the number of piles is according to needs design, and optional 5 ~ 20 layers.

In this embodiment, referring to fig. 6, the first sub-pole piece 111 is a positive pole piece, and the second sub-pole piece 112 is a negative pole piece. In other embodiments, the first sub-pole piece 111 is a negative pole piece, and the second sub-pole piece 112 is a positive pole piece. The first sub-electrode sheet 111 includes a first positive electrode collector 111a and a first positive electrode active material 111b disposed on the first positive electrode collector 111 a. Optionally, the first positive electrode collector 111a is a conductive sheet. For example, the first positive electrode collector 111a is an aluminum foil having a thickness of 10 to 20 μm. The first positive electrode active material 111b includes a transition metal oxide or polyanion-type compound having a layered or spinel structure with a high electrode potential and a stable structure, such as lithium cobaltate, lithium manganate, lithium iron phosphate, a ternary material, and the like. The first positive electrode active material 111b further includes carbon black and a binder. The binder may be polyvinylidene fluoride (PVDF). Optionally, the second sub-pole piece 112 includes a first negative current collector 112a and a first negative active material 112b disposed on the first negative current collector 112 a. The first negative electrode collector 112a is a conductive sheet. For example, the first negative current collector 112a is a 10-20 μm copper foil. The first negative electrode active material 112b may be layered graphite, a simple metal substance, or a metal oxide, such as graphite, carbon fiber, graphene, lithium titanate, or the like, which has a potential as close to a lithium potential as possible, has a stable structure, and can store a large amount of lithium.

Referring to fig. 6, the first tab group 13 includes a first sub-tab 131 and a second sub-tab 132. In this embodiment, the first sub-tab 131 is a positive tab of the first bare cell 1, and the second sub-tab 132 is a negative tab of the first bare cell 1. The first sub-tab 131 and the second sub-tab 132 are made of conductive materials, and the material of the first sub-tab 131 and the material of the second sub-tab 132 are not limited in the application. Such as aluminum, nickel or copper nickel plating, etc. The first sub-tab 131 is electrically connected to the first sub-pole piece 111, and similarly, the second sub-tab 132 is electrically connected to the second sub-pole piece 112.

In this embodiment, the first sub tab 131 is electrically connected to the first sub pole piece 111 by welding, so as to increase the connection stability and the electrical connection reliability of the first sub tab 131 and the first sub pole piece 111. Classified according to the welding energy source, the welding modes include, but are not limited to, gas flame, electric arc, laser, electron beam, friction, ultrasonic welding, and the like. The welding means includes, but is not limited to, welding, pressure welding, brazing, etc., as divided for the purpose of achieving the combination. The first sub-tab 131 and the first sub-pole piece 111 have smaller internal resistance in design, so that the conduction efficiency of current is higher, and the loss is smaller.

The first diaphragm 12 is disposed between the first sub-pole piece 111 and the second sub-pole piece 112 at an interval, and is used for preventing the first sub-pole piece 111 and the second sub-pole piece 112 from directly contacting and electrically conducting. The first separator 12 is a specially formed polymer film, and the first separator 12 has a microporous structure allowing lithium ions to freely pass through but not electrons. The material of the first separator 12 includes, but is not limited to, Polyethylene (PE), polypropylene (PP), or a composite film thereof. The composite membrane is for example a PP/PE/PP three-layer separator.

The first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112 are cut into the same or similar sizes of the single battery cells, and the plurality of first sub-pole pieces 111, the plurality of first diaphragms 12 and the plurality of second sub-pole pieces 112 are sequentially stacked to form a battery cell substrate with a certain height.

Referring to fig. 4, a first punching pit 21 is disposed in the first packaging case 2, the cell substrate is placed in the first punching pit 21, the first packaging case 2 is wrapped by the cell substrate, and the top and the side of the first punching pit 21 are heat sealed. Further, the first electrolyte 14 is injected into the first filling hole 21, and the sealing of the first package 2 is completely sealed by evacuation. Alternatively, the first electrolyte 14 may be an organic solvent in which an electrolyte lithium salt having LiPF is dissolved to supply lithium ions₆、LiClO₄、LiBF₄And the organic solvent is mainly composed of one or a mixture of diethyl carbonate (DEC), Propylene Carbonate (PC), Ethylene Carbonate (EC), dimethyl ester (DMC) and the like. The first electrolyte 14 is injected into the first package casing 2, so that the first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112 are soaked in the first electrolyte 14. The first positive electrode active material 111b and the first negative electrode active material 112b are activated by charging, and a good solid electrolyte phase interface is formed on the surface of the negative electrode. And then, carrying out high-temperature aging on the packaged battery cell 1a, releasing generated gas, cutting off the air bag and redundant side edges, and folding up the side edges to form the final appearance of the packaged battery cell 1 a. The above is an embodiment of the structure and preparation method of the laminated battery cell. The structure and the preparation method of the winding-type battery cell are substantially the same as those of the laminated battery cell, and the main difference is that the number of the first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112 of the winding-type battery cell is one, the area of the first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112 of the winding-type battery cell is relatively large, the first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112 are stacked and then wound into a battery cell substrate with the same or similar size as that of a single battery cell, and then the battery cell substrate.

The above is an example of the structure and the preparation method of the first bare cell 1. The second bare cell 3 can be prepared in the same way.

Referring to fig. 8, the second bare cell 3 includes a second pole piece group 31, at least one second diaphragm 32, and a second pole ear group 33, where the second pole piece group 31 includes a plurality of third sub-pole pieces 311 and a plurality of fourth sub-pole pieces 312; the number of the second diaphragms 32 is plural. The second pole tab group 33 includes a third sub-pole tab 331 and a fourth sub-pole tab 332, the third sub-pole tab 331 is electrically connected to the third sub-pole piece 311, and the fourth sub-pole tab 332 is electrically connected to the fourth sub-pole piece 312.

Referring to fig. 4, a second punching pit 41 is formed on the second package case 4 according to the above method, the second bare cell 3 and the package cell 1a are disposed in the second punching pit 41, and a second electrolyte 34 is injected into the second punching pit 41, where the material of the second electrolyte 34 may be the same as the material of the first electrolyte 14, and the second punching pit 41 is evacuated and a sealing position of the second package case 4 is sealed to form a final shape of the cell assembly 101.

In this application, for convenience of description, the electric core formed after the second bare electric core 3 is encapsulated is defined as an external encapsulation electric core 3 a. The encapsulated cell 1a and the outer encapsulated cell 3a are encapsulated to form a cell assembly 101. The output voltages of the encapsulated battery cell 1a and the outer encapsulated battery cell 3a are not specifically limited. When the electronic device 100 is a mobile phone, the capacity of the single encapsulated battery cell 1a or the single encapsulated battery cell 3a can support the normal operation of the electronic device 100. For example, the output voltage of the packaged electric core 1a is about 5v, but the output voltage is not limited to this, and may be 4.5v, 4.45v, or the like. The capacity of the packaged battery cell 1a may be 1700-2000 mAh. The output voltage of the external sealed battery cell 3a is about 5 v. The capacity of the outer encapsulated cell 3a is the same as or similar to the capacity of the encapsulated cell 1 a.

The electric connection mode of the encapsulated battery cell 1a and the external encapsulated battery cell 3a is not specifically limited, and the encapsulated battery cell 1a and the external encapsulated battery cell 3a can be arranged in series or in parallel. When the encapsulated battery cell 1a and the external encapsulated battery cell 3a are arranged in series, the charging voltage of the battery cell assembly 101 is doubled relative to the single encapsulated battery cell 1a, the charging rate of the battery cell assembly 101 is increased, and the quick charging application is realized. When the encapsulated battery cell 1a and the external encapsulated battery cell 3a are arranged in parallel, the charging current of the battery cell assembly 101 is doubled relative to the single encapsulated battery cell 1a, the charging rate of the battery cell assembly 101 is increased, and the quick charging application is realized.

The application provides an electricity core subassembly 101 is through encapsulating two electric cores, compare in single electric core and realize that the charge rate of electricity core subassembly 101 doubles and capacity doubles, furtherly, because second encapsulation shell 4 directly will encapsulate including electric core 1a, encapsulate electric core 1a and the naked electric core 3 of second and closely encapsulate promptly, encapsulation electric core 1a and the naked electric core 3 little clearance of second or zero clearance encapsulation, so, realize two electric cores (encapsulation electric core 1a and the naked electric core 3 of second) little clearance or zero clearance encapsulation, reduce the inside space waste of electricity core subassembly 101, when guaranteeing the capacity of electricity core subassembly 101, greatly reduced the whole size of electricity core subassembly 101, in the extremely effectual electronic equipment 100 of inner space, it has great meaning to the whole size reduction research of electricity core subassembly 101. The internal space of the battery assembly 10 is further compressed, and the space is more fully utilized, so that the volume of the electronic device 100 is reduced while the battery capacity is ensured.

In the embodiment of the present application, only two bare cells are taken as an example for illustration. In other embodiments, based on the inventive concept of the present application, more than two bare cell layers may be arranged to be sleeved with each other and packaged. For example, on the basis of the above-mentioned embodiment, still set up naked electric core of third and third encapsulation shell, the naked electric core of third is adjacent and closely set up with foretell outer sealed electric core 3a, and the encapsulation of third encapsulation shell is outside naked electric core of third and outer sealed electric core 3a to form three electric core assembly 101 that the electric core structure is established ties or is parallelly connected. Each cell can independently support 5v of voltage, so that the cell component 101 with the three-cell structure connected in series can support 15v of voltage, and further increase the charging voltage; the parallel-connected cell component 101 of the three-cell structure can support 3 times of current, and further increases the charging current. In other words, N establishes ties can realize the theoretical N times charging power, and at this moment, only need guarantee have a naked electric core in shaping electric core inside, the rest for the electric core that has been encapsulated can.

The present application takes as an example that a bare cell and a packaged cell are packaged in the cell assembly 101.

Referring to fig. 4, the battery assembly 10 further includes a first electrolyte 14 and a second electrolyte 34. The first electrolyte 14 is filled in the first punching pit 21 of the first package 2, and the second electrolyte 34 is filled in the second punching pit 41 of the second package 4. The first package 2 is used for blocking the first electrolyte 14 from the second electrolyte 34. In other words, first electrolyte 14 cannot flow to second bare cell 3 through first encapsulation shell 2, and second electrolyte 34 cannot flow to first bare cell 1 through first encapsulation shell 2. So, first encapsulation shell 2 not only is used for sealed and first naked electric core 1 of closely parcel, and first encapsulation shell 2 can also block first electrolyte 14 and second electrolyte 34 to make first electrolyte 14 encapsulate in first encapsulation shell 2. The second electrolyte 34 is encapsulated between the first and second encapsulation shells 2, 4. The encapsulated cell 1a and the encapsulated cell 3a form an independent cell structure.

When first electrolyte 14 and second electrolyte 34 circulate between first naked electric core 1 and the naked electric core 3 of second, exert 10v voltage on electric core subassembly 101. The first electrolyte 14 and the second electrolyte 34 are both subjected to 10v, and thus, the properties of the first electrolyte 14 and the second electrolyte 34 are damaged, and the electric core assembly 101 cannot work normally.

The first electrolyte 14 is separated from the second electrolyte 34 by the first packaging casing 2, so that the packaged battery cell 1a and the external packaged battery cell 3a form an independent battery cell structure. When the cell assembly 101 applies 10v voltage, the encapsulated cell 1a and the outer encapsulated cell 3a bear 10v voltage together, and under the condition that the capacities of the encapsulated cell 1a and the outer encapsulated cell 3a are the same, the encapsulated cell 1a and the outer encapsulated cell 3a bear 5v voltage respectively, so that the first electrolyte 14 and the second electrolyte 34 bear 5v voltage respectively; compared with the implementation mode that the first electrolyte 14 and the second electrolyte 34 cannot be blocked from flowing through each other in the first package casing 2, and then the first electrolyte 14 and the second electrolyte 34 both need to bear 10v of voltage, the first electrolyte 14 and the second electrolyte 34 in the embodiment of the present application do not need to bear doubled voltage, that is, the range of the voltage window for using the internal design materials of the battery assembly 10, such as the electrolyte and the anode and cathode materials, is not increased, and is favorable for the normal operation of the electrolytes of the package electric core 1a and the external package electric core 3a, and the normal use of the electric core assembly 101 is ensured.

The material of the first package 2 is not specifically limited in this application. The material of the first package 2 includes, but is not limited to, a material having a liquid-blocking ability and a certain flexibility. For example, the material of the first package casing 2 includes, but is not limited to, a plastic material, a metal film material, and the like. Further, the present application further studies the material of the first package housing 2, and proposes that the material of the first package housing 2 is a material having better corrosion resistance and barrier property against the electrolyte (including the first electrolyte 14 and the second electrolyte 34), and has a certain flexibility, for example, the material of the first package housing 2 includes at least one of aluminum, copper, and nickel, further, the first package housing 2 may be an alloy film formed by any one of aluminum foil, copper foil, nickel foil, or the above metals, so that the first package housing 2 is easy to machine and form, can be flexibly formed to seal the first bare cell 1, and can effectively block the first electrolyte 14 and the second electrolyte 34, so that the voltage borne by the electrolyte is within an effective range, and the normal operation of the cell assembly 101 is promoted; in addition, the first package case 2 has better corrosion resistance to the electrolyte, so that the electrolyte is not affected even if the first package case is in contact with the electrolyte for a long time, and the service life of the core assembly 101 is prolonged.

Further, the first package housing 2 may be an aluminum-plastic film, so that the first package housing 2 has extremely high barrier property, good cold stamping formability, puncture resistance, electrolyte resistance stability and insulation property, and meets the application condition of the first package housing 2.

The above is the material design of the first package casing 2, and the material of the second package casing 4 in this application may be the same as or different from the material of the first package casing 2. For example, the second package case 4 is made of an aluminum plastic film, and the first package case 2 is made of an aluminum foil, a copper foil, a nickel foil, or an alloy film made of any one of the above metals. Or, the first package shell 2 and the second package shell 4 are both made of aluminum-plastic films.

In the embodiment of the application, the first packaging shell 2 is designed by using materials, so that the first packaging shell 2 can block the circulation of the first electrolyte 14 and the second electrolyte 34, the first packaging shell 2 packages the first electrolyte 14 and the first bare cell 1 into an independent packaging cell 1a, the second packaging shell 4 packages the second electrolyte 34 and the second bare cell 3 into an independent external packaging cell 3a, the packaging cell 1a and the external packaging cell 3a are structurally nested with each other, and can be used as cells which are arranged independently during charging and discharging, so that even if the electrolytes in the packaging cell 1a and the external packaging cell 3a only need to bear the voltage within a normal range, the problems of overhigh bearing voltage and poor charging and discharging of the cell assembly 101 cannot be caused; the application voltage window range of the internal design materials of the battery, such as electrolyte and anode and cathode materials, can not be increased, and the normal use of the formed battery core is ensured.

The capacity of encapsulation electric core 1a and outer seal electric core 3a is the same or similar in this application to make encapsulation electric core 1a and outer seal electric core 3a load the same or similar voltage when establishing ties, perhaps load the same or similar electric current when encapsulation electric core 1a and outer seal electric core 3a connect in parallel, in order to realize two electric core structures, realize charging voltage or charging current double, improve charge efficiency and two electric core structure's is small. The capacity of the external battery cell 3a is the same as or similar to that of the encapsulated battery cell 1a, and the external battery cell 3a and the encapsulated battery cell 1a can be charged fully or discharged synchronously, so that the phenomenon that one battery cell is overcharged and another battery cell is charged unsatisfactorily to damage the battery cell is avoided, or the phenomenon that one battery cell is overdischarged and another battery cell has residual electric quantity to cause the residual electric quantity to be incapable of being discharged is avoided, and the charging safety, the discharging efficiency and the like of the battery cell assembly 101 are improved.

Optionally, the capacities of the encapsulated battery cell 1a and the external encapsulated battery cell 3a are similar, that is, the difference between the capacities is smaller than or equal to a first preset value, where the first preset value is 5% of the capacity of the encapsulated battery cell 1a or the external encapsulated battery cell 3a, and certainly, the first preset value is not limited to 5%, and may also be 5.5%, 6%, and the like.

In an embodiment, the second bare cell 3 is arranged in parallel with the encapsulated cell 1 a. The current of the second bare cell 3 is the same as or similar to the current of the encapsulated cell 1 a. In another embodiment, the second bare cell 3 is arranged in series with the encapsulated cell 1 a. The voltage of the second bare cell 3 is the same as or similar to the voltage of the encapsulated cell 1 a. In the above manner, the capacities of the external-sealed cell 3a and the packaged cell 1a are the same or similar, and the charging current is doubled on the premise that the charging voltage is consistent with that of the single cell; or, on the premise that the charging current is kept consistent with the single electric core, the charging voltage is doubled, so that the charging speed of the battery is doubled; the capacity of the external battery cell 3a is the same as or similar to that of the encapsulated battery cell 1a, and the external battery cell 3a and the encapsulated battery cell 1a can be charged fully or discharged synchronously, so that the phenomenon that one battery cell is overcharged and the other battery cell is charged unsatisfactorily to damage the battery cell is avoided, or the phenomenon that one battery cell is overdischarged and the other battery cell has residual electric quantity to cause the residual electric quantity to be incapable of being discharged is avoided.

The specific manner in which the capacities of the encapsulated battery cell 1a and the encapsulated battery cell 3a are set to be the same or similar includes, but is not limited to, that the effective acting area of the encapsulated battery cell 1a is equal to or similar to the effective acting area of the encapsulated battery cell 3 a. The effective action area of the packaged battery cell 1a refers to the facing area of the first sub-pole piece 111, the first diaphragm 12 and the second sub-pole piece 112. The effective action area of the external cell 3a refers to the facing area of the third sub-pole piece 311, the second diaphragm 32 and the fourth sub-pole piece 312.

Specifically, first naked electric core 1 includes relative and insulating first positive plate and the first negative pole piece that sets up. The first positive plate is a first sub-plate 111, and the first negative plate is a second sub-plate 112. The total area of the first positive plate facing the first negative plate is a first effective area, that is, the effective active area of the encapsulated battery cell 1 a. In an embodiment, the first bare cell 1 is a winding cell structure, the area of the first positive plate is the same as the area of the first negative plate, and the first effective area is also the area of the first negative plate or the first positive plate. In another embodiment, the first bare cell 1 is a laminated cell structure, and the sum of the areas of all the first positive plates is equal to the sum of the areas of all the first negative plates. The first effective area is the sum of the areas of all the first positive plates.

Naked electric core 3 of second includes relative and insulating second positive plate and the second negative pole piece that sets up. The second positive electrode tab is the third sub-tab 311, and the second negative electrode tab is the fourth sub-tab 312. The total area of the second positive plate facing the second negative plate is a second effective area, that is, the effective action area of the outer sealed electric core 3 a. In an embodiment, the second bare cell 3 is a winding cell structure, the area of the second positive plate is the same as that of the second negative plate, and the second effective area is also the area of the second negative plate or the second positive plate. In another embodiment, the second bare cell 3 is of a laminated cell structure, and the sum of the areas of all the second positive plates is the same as the sum of the areas of all the second negative plates. The second effective area is the sum of the areas of all the second positive plates.

The first effective area is equal to the second effective area or the difference is smaller than a second preset value. The second preset value is 5% of the first effective area or the second effective area, and of course, is not limited to 5%, and may be 5.5%, 6%, and the like.

In the embodiment of the application, the effective action area of the encapsulated battery cell 1a is equal to or similar to the effective action area of the externally encapsulated battery cell 3a, so that the capacities of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a are the same or similar, so that the encapsulated battery cell 1a and the externally encapsulated battery cell 3a can load the same or similar voltage when being connected in series, or the encapsulated battery cell 1a and the externally encapsulated battery cell 3a can load the same or similar current when being connected in parallel, so that a dual-battery-cell structure is realized, the charging voltage or the charging current is doubled, the charging efficiency is improved, and the dual-battery-cell structure enables the volume of the battery cell assembly 101 to be extremely small through nested encapsulation, when the battery cell assembly 101 is applied to the electronic device 100, the occupied space in the electronic device 100 is small, and the capacity of the battery assembly 10 is large; and the external-sealed battery cell 3a and the packaged battery cell 1a can be fully charged or discharged synchronously, so that the phenomenon that one battery cell is overcharged and the other battery cell is not saturated to damage the battery cell or the phenomenon that one battery cell is overdischarged and the other battery cell has residual capacity to cause the residual capacity to be incapable of being discharged is avoided, and the charging safety, the discharging efficiency and the like of the battery cell assembly 101 are improved.

The specific mode that this application is the same or similar to the capacity of encapsulation electric core 1a and outer encapsulation electric core 3a includes but not limited to the volume of the naked electric core 3 of second and the volume of the naked electric core 1 of first equal or similar.

Optionally, the volume of the second bare cell 3 is smaller than the volume of the encapsulated cell 1 a. Further, the volume of the naked electric core 3 of second equals the volume of the naked electric core 1 of first.

Specifically, the first bare cell 1 is tightly and stacked with the first sub-pole piece 111, the first diaphragm 12, and the second sub-pole piece 112. The second bare cell 3 is a third sub-pole piece 311, a second diaphragm 32, and a fourth sub-pole piece 312 that are tightly and stacked. The volume of the second naked battery cell 3 is the same as that of the first naked battery cell 1, so that the effective action area of the first naked battery cell 1 is the same as or similar to that of the second naked battery cell 3, and further the capacity of the encapsulated battery cell 1a is the same as or similar to that of the externally encapsulated battery cell 3a, so that the encapsulated battery cell 1a and the externally encapsulated battery cell 3a can load the same or similar voltage when being connected in series, or the encapsulated battery cell 1a and the externally encapsulated battery cell 3a load the same or similar current when being connected in parallel, so as to realize a double-battery-cell structure, double charging voltage or charging current is doubled, the charging efficiency is improved, the double-battery-cell structure enables the volume of the battery cell assembly 101 to be extremely small through nested encapsulation, when the battery cell assembly 101 is applied to the electronic equipment 100, the occupied space in the electronic equipment 100 is small, and the capacity of the battery assembly 10 is large; and the external-sealed battery cell 3a and the packaged battery cell 1a can be fully charged or discharged synchronously, so that the phenomenon that one battery cell is overcharged and the other battery cell is not saturated to damage the battery cell or the phenomenon that one battery cell is overdischarged and the other battery cell has residual capacity to cause the residual capacity to be incapable of being discharged is avoided, and the charging safety, the discharging efficiency and the like of the battery cell assembly 101 are improved.

The specific manner in which the volume of the second bare cell 3 is equal to or similar to the volume of the first bare cell 1 includes, but is not limited to, the following embodiments.

In a first possible embodiment, please refer to fig. 4, the encapsulated battery cell 1a and the second bare battery cell 3 are stacked in the thickness direction (i.e. the Z-axis direction). The area of the encapsulated battery cell 1a is the same as or similar to the area of the second bare battery cell 3. The thickness h1 of the second bare cell 3 is less than the thickness h2 of the encapsulated cell 1 a.

Generally speaking, encapsulation electric core 1a includes first naked electric core 1 and the first encapsulation shell 2 of the first naked electric core 1 of parcel, and the area of the naked electric core 3 of hypothesis second equals the area of first naked electric core 1, then the area of encapsulation electric core 1a is greater than the area of the naked electric core 3 of second. Further, suppose that the length of the naked electric core 3 of second equals with the length of the naked electric core 1 of second, and the width of the naked electric core 3 of second equals with the width of the naked electric core 1 of first, then the side of the electric core subassembly 101 that forms behind encapsulation electric core 1a and the encapsulation of second electricity core will produce the segment difference, lead to the side unevenness of electric core subassembly 101.

In this embodiment, the area of encapsulating electric core 1a is the same as or similar to the area of naked electric core 3 of second through the design to the outward appearance face of the electric core subassembly 101 that forms after messenger's encapsulation electric core 1a and the encapsulation of the naked electric core 3 of second is level and smooth.

The area of encapsulation electric core 1a is the same or similar with the area of the naked electric core 3 of second, leads to the area of the naked electric core 3 of second to be greater than the area of first naked electric core 1, so, easily leads to the effective area of the naked electric core 3 of second to be greater than the effective area of first naked electric core 1.

Further, the thickness h1 that this embodiment set up naked electric core 3 of second is less than encapsulation electric core 1 a's thickness h2 to make naked electric core 3's of second volume the same with encapsulation electric core 1 a's volume or similar, and then make encapsulation electric core 1 a's effective area the same with outer effective area of sealing electric core 3a or similar, so, make encapsulation electric core 1 a's capacity the same with outer capacity of sealing electric core 3a or similar.

Specifically, referring to fig. 9, for convenience of illustration, fig. 9 is a schematic structural diagram of the packaged battery cell in fig. 4 removed from the second package casing. Note that, during use of the battery assembly 10, the encapsulated battery cell 1a is disposed in the second encapsulating case 4. The outer surface of the packaged battery cell 1a includes a battery cell top surface 103, a battery cell bottom surface 104, and a plurality of battery cell side surfaces 105 connected end to end in sequence, which are arranged opposite to each other, and are connected between the battery cell top surface 103 and the battery cell bottom surface 104. Naked electric core 3's of second surface is including the naked electric core top surface 303, the naked electric core bottom surface 304 that set up back to the back of the body to and a plurality of naked electric core side 305 of end to end connection in proper order of connection between naked electric core top surface 303 and naked electric core bottom surface 304. At least one electric core side 105 flushes with naked electric core side 305 that corresponds to avoid encapsulating electric core 1a and the naked electric core 3 of second to pile up and form unevenness's side after setting up. Further, all the cell side surfaces 105 are flush with the corresponding bare cell side surfaces 305, so that all the cell side surfaces 105 of the packaged cell 1a are flush with the cell side surfaces 105 of the corresponding second bare cell 3, that is, the orthographic projections of the packaged cell 1a and the second bare cell 3 in the thickness direction are superposed, so that the side surfaces of the formed cell assembly 101 are all planes with higher flatness; thickness h1 through making naked electric core 3 of second is less than encapsulation electric core 1 a's thickness h2 to make encapsulation electric core 1 a's volume the same with naked electric core 3's of second volume or similar, and then realize encapsulation electric core 1 a's capacity and outer encapsulation electric core 3 a's capacity the same or similar, and then realize that the space that electric core subassembly 101 occupy is little and capacious.

In a second possible implementation, please refer to fig. 5, the encapsulated battery cell 1a and the second bare battery cell 3 are arranged side by side. Further, the thickness of setting encapsulation electric core 1a equals or is close (for example, is less than 1mm) with the thickness of the naked electric core 3 of second to make encapsulation electric core 1a and the naked electric core 3 of second top surface and the bottom surface roughness height at the electric core subassembly 101 after the encapsulation. The area of the naked electric core 3 of second is less than the area of encapsulation electric core 1a to make the volume of the naked electric core 3 of second close or equal with the volume of encapsulation electric core 1 a.

Specifically, the outer surface of the packaged battery cell 1a includes a battery cell bottom surface 104 and a battery cell top surface 103, which are arranged opposite to each other. The surface of naked electric core 3 of second includes the naked electric core bottom surface 304 and the naked electric core top surface 303 of carrying on the back the setting. Cell bottom surface 104 is flush with naked cell bottom surface 304, and cell top surface 103 is flush with naked cell top surface 303 to make the top surface and the bottom surface roughness of cell subassembly 101 high.

Generally speaking, the thickness of encapsulation electricity core 1a equals with the thickness of the naked electric core 3 of second, and then the thickness of the naked electric core 1 of first is less than the thickness of the naked electric core 3 of second.

Further, this embodiment is less than the area of encapsulation electric core 1a through the area that sets up the naked electric core 3 of second to make the volume of the naked electric core 3 of second close or equal with the volume of encapsulation electric core 1a, and then realize that the capacity of encapsulation electric core 1a is the same with the capacity of outer encapsulation electric core 3a or close.

Specifically, encapsulation electric core 1a sets up side by side with naked electric core 3 of second along the X axle direction, and then encapsulation electric core 1a equals with naked electric core 3 of second length in the Y axle direction, and encapsulation electric core 1a is less than naked electric core 3 of second length in the X axle direction along the ascending length in X axle direction to make encapsulation electric core 1a flush with naked electric core 3 of second both sides side in the Y axle direction along two sides in the Y axle direction.

This embodiment is equal through the thickness of the naked electric core 3 of encapsulation electric core 1a and the second that the design set up side by side, and length in the array orientation is different, and length in the perpendicular to array orientation is the same, and then realizes that the apparent surface roughness of the naked electric core subassembly 101 that 3 forms of the naked electric core of encapsulation electric core 1a and the second that set up side by side is high and the capacity of two electric cores is the same or similar, and then realizes that the space that electric core subassembly 101 occupy is little and the capacity is high.

In one embodiment, referring to fig. 10, the battery assembly 10 further includes an equalizing module 51. The equalization module 51 is arranged outside the second package 4. Further, the equalizing module 51 may be provided on the protection plate 102. The equalizing module 51 electrically connects the encapsulated cell 1a and the outer encapsulated cell 3 a. The balancing module 51 is configured to balance voltages of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a when the encapsulated battery cell 1a is connected in series with the externally encapsulated battery cell 3a, and is further configured to balance currents of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a when the encapsulated battery cell 1a is connected in parallel with the externally encapsulated battery cell 3 a. This embodiment may be combined with the embodiment in which the volume of the encapsulated cell 1a and the volume of the encapsulated cell 3a are the same or different.

In one embodiment, referring to fig. 10, the encapsulated cell 1a is connected in series with the outer encapsulated cell 3 a. Further, a voltage detection module 52 is disposed on the protection plate 102. The voltage detection module 52 is configured to detect voltages of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a, and when the voltage detection module 52 detects that the voltage of the externally encapsulated battery cell 3a is greater than the voltage of the encapsulated battery cell 1a and a difference between the voltage of the externally encapsulated battery cell 3a and the voltage of the encapsulated battery cell 1a is greater than a preset threshold, the equalization module 51 is configured to charge the encapsulated battery cell 1a by using the externally encapsulated battery cell 3a to equalize the voltages between the encapsulated battery cell 1a and the externally encapsulated battery cell 3a, so that the voltages between the encapsulated battery cell 1a and the externally encapsulated battery cell 3a are equal.

When the voltage detection module 52 detects that the voltage of the encapsulated battery cell 1a is greater than the voltage of the outer encapsulated battery cell 3a, and the difference between the voltage of the encapsulated battery cell 1a and the voltage of the outer encapsulated battery cell 3a is greater than the preset threshold, the equalization module 51 is configured to charge the outer encapsulated battery cell 3a by using the encapsulated battery cell 1a, so as to equalize the voltages between the encapsulated battery cell 1a and the outer encapsulated battery cell 3a, so that the voltages between the encapsulated battery cell 1a and the outer encapsulated battery cell 3a are equal.

The voltage detection module 52 detects the voltages of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a in real time, and the equalization module 51 regulates and controls the voltages of the encapsulated battery cell 1a and the externally encapsulated battery cell 3a in real time, so as to realize the real-time equality of the voltages between the encapsulated battery cell 1a and the externally encapsulated battery cell 3 a.

For example, referring to fig. 11, the equalizing module 51 is an LRC series circuit, and specifically includes an inductor L, MOS, a Q1, a Q2, a Q3, a Q4, a resistor R, and a capacitor C.

The encapsulated cell 1a is connected in series with the outer encapsulated cell 3 a. The MOS transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 are sequentially connected in series, and are electrically connected to the positive electrode of the sealed cell 1a and the negative electrode of the externally sealed cell 3 a. The first end of the capacitor C is electrically connected between the MOS transistor Q1 and the second switch transistor Q2. The second end of the capacitor C is electrically connected to the first end of the inductor L, the second end of the inductor L is electrically connected to the first end of the resistor R, and the second end of the resistor R is electrically connected between the third switching tube Q3 and the fourth switching tube Q4. The electric connection line between the second switching tube Q2 and the third switching tube Q3 is also electrically connected between the sealed battery cell 1a and the outer sealed battery cell 3 a.

In other embodiments, the inductor L may be electrically connected between the electrical connection line between the second switching tube Q2 and the third switching tube Q3 and the sealed battery cell 1a and the sealed battery cell 3 a.

The working mode is as follows: assuming that the voltage of the encapsulated battery cell 1a is 4.3V and the voltage of the outer encapsulated battery cell 3a is 4.2V, the electric quantity needs to be moved from the encapsulated battery cell 1a to the outer encapsulated battery cell 3 a. At the beginning, the MOS tubes Q1 and Q3 are switched on, the MOS tubes Q2 and Q4 are switched off, the MOS tubes Q1 and Q3 are switched off after the time T1, and the MOS tubes Q2 and Q4 are switched on after the time T2; after time T1, the MOS transistors Q2 and Q4 are turned off, and after time T2, the MOS transistors Q1 and Q3 are turned on … …, and the steps are repeated. The duty cycle is T-2 (T2+ T1). The above process may be equivalent to loading a pulsed voltage signal with a dc component of 4.25V, Vpp being 0.5V, into the equalization module 51.

In another embodiment, referring to fig. 12, the packaged cell 1a is connected in parallel with the second bare cell 3. Further, the protection plate 102 is provided with a current detection circuit 53. The current detection circuit 53 is used for detecting the currents of the encapsulated battery core 1a and the naked battery core 3 of second, and when the current detection circuit 53 detects that the current of the externally encapsulated battery core 3a is greater than the current of the encapsulated battery core 1a, and the difference between the current of the externally encapsulated battery core 3a and the current of the encapsulated battery core 1a is greater than a preset threshold value, the balancing module 51 is used for charging the encapsulated battery core 1a by using the externally encapsulated battery core 3a, so as to balance the currents between the encapsulated battery core 1a and the externally encapsulated battery core 3a, and thus, the currents between the encapsulated battery core 1a and the externally encapsulated battery core 3a are equal.

This embodiment is through setting up balanced module 51 to make encapsulation electric core 1a and outer encapsulation electric core 3a can charge with discharging in the equilibrium, effectively avoid one electric core in two electric core structures to overcharge and another electric core unsaturated phenomenon of charging, improve battery pack 10's life.

The structure of the electric core assembly 101 is not particularly limited in the present application, and the structure of the electric core assembly 101 is exemplified by the following embodiments.

Referring to fig. 13, the second package 4 includes a receiving shell 42 and a package cover 43 formed integrally. In this embodiment, the second package shell 4 is an aluminum-plastic film. The accommodating case 42 is formed by punching. The accommodating case 42 is provided with an accommodating groove 420 therein. The storage groove 420 is the second punched pit. The packaged battery cell 1a and the second bare battery cell 3 are attached to each other or disposed in the accommodating groove 420 at intervals. Specifically, the encapsulated battery cell 1a and the second bare battery cell 3 are stacked and attached in the thickness direction (Z-axis direction); or the encapsulated battery cell 1a and the second bare battery cell 3 are arranged side by side (along the X-axis direction or the Y-axis direction) and attached; or, encapsulation electric core 1a and the naked electric core 3 of second set up side by side and looks interval, and the interval between encapsulation electric core 1a and the naked electric core 3 of second can be controlled, can improve battery pack 10's flexibility like this. The sealing cover 43 covers the opening of the receiving groove 420. The edge of the packing cover 43 is hermetically connected to the edge of the receiving case 42. Specifically, the edge of the sealing cover 43 and the edge of the accommodating case 42 are sealed by a sealant.

Referring to fig. 13, at least one barrier 44 is disposed on the inner wall of the receiving groove 420. Specifically, the bottom wall or the side wall of the receiving groove 420 is provided with a barrier strip 44. The barrier strip 44 separates the receiving groove 420 to form a first receiving groove 421 and a second receiving groove 422. The encapsulated battery cell 1a and the second bare battery cell 3 are respectively disposed in the first receiving groove 421 and the second receiving groove 422. Further, the accommodating space of the first accommodating groove 421 is adapted to the volume of the packaged battery cell 1a, and the accommodating space of the second accommodating groove 422 is adapted to the volume of the packaged battery cell 1 a.

In an embodiment, please refer to fig. 13, for convenience of illustration, fig. 13 is a schematic structural diagram of a first second package casing according to an embodiment of the present application. Note that, during use of the battery assembly 10, the encapsulating battery cell 1a and the outer encapsulating battery cell 3a are provided in the second encapsulating case 4. The barrier 44 is formed for the receiving case 42 to protrude toward the packing cover 43. For example, a back side of the receptacle shell 42 is stamped to form the bars 44. The surface of the blocking strip 44 facing the encapsulation cover 43 is in contact with the encapsulation cover 43 or is spaced apart from it. Since the inner portion of the barrier 44 is an empty space, a deformable space is provided for a portion of the first receiving groove 421 and a portion of the second receiving groove 422 of the receiving case 42 to approach or separate from each other. The barrier strip 44 bends when the packaged battery cell 1a is bent relative to the second bare battery cell 3. In the embodiment of the application, the encapsulated battery cell 1a and the second bare battery cell 3 are arranged at intervals, and the barrier strips 44 are arranged at intervals, so that the encapsulated battery cell 1a and the second bare battery cell 3 are fixed in the accommodating groove 420 by the barrier strips 44; on the other hand, the barrier 44 is a thin sheet structure and is easily bent, so that the packaged battery cell 1a and the second bare battery cell 3 can be bent, and the battery pack assembly 101 forms a bendable battery assembly 10 and a curved battery, and is further applied to the bendable electronic device 100 and the curved electronic device 100.

Specifically, the cross section of the barrier rib 44 may be in a circular arc sheet state, a semi-rectangular sheet state, a semi-trapezoidal sheet state, or the like.

In another embodiment, please refer to fig. 14, for convenience of illustration, fig. 14 is a schematic structural diagram of a second package casing according to an embodiment of the present application. Note that, during use of the battery assembly 10, the encapsulating battery cell 1a and the outer encapsulating battery cell 3a are provided in the second encapsulating case 4. The barrier strip 44 is protruded from the inner wall of the receiving groove 420. Specifically, the barrier strip 44 is disposed on an inner wall or a sidewall of the receiving groove 420. Optionally, the barrier rib 44 includes a first barrier rib 441 and a second barrier rib 442 that are spaced apart. The encapsulated battery cell 1a is disposed on a side of the first barrier strip 441, which is away from the second barrier strip 442. The naked electric core 3 of second locates the one side that second blend stop 442 deviates from first blend stop 441. Further, the package cell 1a is sandwiched between the first barrier 441 and the inner wall of the first receiving groove 421. The outer cell 3a is sandwiched between the second barrier 442 and the inner wall of the second accommodating groove 422. The part between the first barrier strip 441 and the second barrier strip 442 is sheet-shaped, and the part between the first barrier strip 441 and the second barrier strip 442 is bent when the packaged battery cell 1a is bent relative to the second bare battery cell 3. In this way, the first barrier 441 and the second barrier 442 fix the positions of the encapsulated electric core 1a and the second bare electric core 3 in the accommodating groove 420; the portion between the first barrier strip 441 and the second barrier strip 442 is easily bent, so that the packaged electric core 1a and the second bare electric core 3 can be bent, and the electric core assembly 101 forms a bendable battery assembly 10, and is further applied to the bendable electronic device 100.

Because naked electric core 3 of second is not packaging structure, the pole piece of naked electric core 3 of second, the diaphragm is the state of unrestrainting, when having the clearance between naked electric core 3 of second and encapsulation electric core 1a, naked electric core 3 of second is not when being bound the dislocation between easy emergence pole piece and the pole piece, through set up blend stop 44 between naked electric core 3 of second and encapsulation electric core 1a, can tie the pole piece and the diaphragm of naked electric core 3 of second effectively, prevent that the pole piece and the diaphragm of naked electric core 3 of second from staggering, so that naked electric core 3 of encapsulation second and encapsulation electric core 1 a.

With reference to any one of the above embodiments, at least a portion of the outer surface of the first bare cell 1 is attached to the inner surface of the first encapsulant can 2; and/or at least part of the outer surface of the packaging battery core 1a is attached to the inner surface of the second packaging shell 4; and/or at least part of the outer surface of the second bare cell 3 is attached to the inner surface of the second encapsulating shell 4.

Further, the laminating of the surface of first naked electric core 1 and the internal surface of first packaging shell 2, and the laminating of the surface of encapsulation electric core 1a and the internal surface of second packaging shell 4, and the laminating of the surface of the naked electric core 3 of second and the internal surface of second packaging shell 4, so that first naked electric core 1 of first packaging shell 2 parcel closely, reduce the overall dimension of encapsulation electric core 1a, and make the naked electric core 3 of second and encapsulation electric core 1a of second packaging shell 4 parcel closely, reduce the overall dimension of electric core subassembly 101, so that electric core subassembly 101 has higher capacity under less size.

The present application includes, but is not limited to, the following embodiments for the electrical connection relationship between the encapsulated battery cell 1a and the encapsulated battery cell 3 a.

Referring to fig. 15, the packaged cell 1a includes a first sub-tab 131 and a second sub-tab 132. The first bare cell 1 includes a third sub-tab 331 and a fourth sub-tab 332.

In one embodiment, referring to fig. 15, the first sub-tab 131 forms a first tab 101a of the battery assembly 10. The fourth sub-tab 332 forms the second tab 101b of the battery assembly 10. The second sub-tab 132 is electrically connected with the third sub-tab 331. The first sub-tab 131 is a positive tab, and the fourth sub-tab 332 is a negative tab. In other embodiments, the second sub-tab 132 forms the first tab 101a of the battery assembly 10. The third sub-tab 331 forms the second tab 101b of the battery assembly 10. The first sub-tab 131 is electrically connected with the fourth sub-tab 332.

In an embodiment, referring to fig. 15, when the packaged electric core 1a and the second bare electric core 3 are stacked, a distance between the first sub-tab 131 and the second sub-tab 132 is greater than a distance between the second sub-tab 132 and the third sub-tab 331, and a distance between the third sub-tab 331 and the fourth sub-tab 332 is greater than a distance between the second sub-tab 132 and the third sub-tab 331. Specifically, the first sub-tab 131, the second sub-tab 132, the third sub-tab 331 and the fourth sub-tab 332 are all disposed on a first side of the core assembly 101, wherein the first sub-tab 131 and the fourth sub-tab 332 are respectively close to two opposite ends of the first side. The second sub-tab 132 and the third sub-tab 331 are disposed between the first sub-tab 131 and the fourth sub-tab 332, and the second sub-tab 132 and the third sub-tab 331 are close to each other, so as to facilitate electrical connection between the second sub-tab 132 and the third sub-tab 331, wherein the specific electrical connection manner includes but is not limited to welding, conductive adhesive, and the like.

In another embodiment, referring to fig. 16, the first sub-tab 131 is electrically connected to the third sub-tab 331 and is integrated with the first tab 101a of the battery assembly 10. The second sub-tab 132 is electrically connected to the fourth sub-tab 332 and is integrated into the second tab 101b of the battery assembly 10. Specifically, the first sub-tab 131 and the third sub-tab 331 are close to each other, so that the first sub-tab 131 and the third sub-tab 331 are electrically connected to each other. The second sub-tab 132 and the fourth sub-tab 332 are close to each other, so that the second sub-tab 132 and the fourth sub-tab 332 are electrically connected.

Referring to fig. 17, an embodiment of the present application further provides a method for manufacturing a battery assembly 10. The method comprises the following steps.

Step 110: preparing a first naked electric core 1 and a first packaging shell 2, forming a first punching pit 21 on the first packaging shell 2, and arranging the first naked electric core 1 in the first punching pit 21.

Specifically, the structure of the first bare cell 1 can refer to the specific structure of the first bare cell 1. Further, a first sub-tab 131 and a second sub-tab 132 are prepared. The first package 2 may refer to the description of the first package 2 above. In this embodiment, the first package case 2 is an aluminum-plastic film, and is stamped and stretched by a stamping die to form the first stamping pit 21 and the air bag, where the air bag is used to contain gas generated by gasification, and then trimmed to a required size, and the first bare cell 1 is wrapped in the first stamping pit 21 of the aluminum-plastic film.

Step 120: first electrolyte 14 is injected into a first pit 21 of the first packaging shell 2, so that the first packaging shell 2 seals the first naked battery cell 1 and the first electrolyte 14 to form a packaged battery cell 1 a.

Specifically, the top side sealing process is performed on the first punch-out pit 21 of the first package 2. And baking the adhesive layer at the edge of the first punched pit 21 of the first packaging shell 2. The first electrolyte 14 is injected into the first pit 21 of the first package 2, and the material of the first electrolyte 14 can refer to the above description. And obtaining the packaged battery cell 1a through formation, vacuumizing, secondary packaging, edge cutting, air bag subtraction, gas release and capacity grading.

Step 130: preparing a second naked electric core 3 and a second packaging shell 4, forming a second punching pit 41 on the second packaging shell 4, and arranging the packaged electric core 1a and the second naked electric core 3 in the second punching pit 41.

Specifically, the structure of the second bare cell 3 may refer to the specific structure described above. Further, a third sub-tab 331 and a fourth sub-tab 332 are prepared. The second package 4 may refer to the description above for the first package 2. In this embodiment, the second package case 4 is an aluminum-plastic film, and is punched and stretched by a punching mold to form the second punching pit 41 and the air bag, where the air bag is used to contain the gas generated by gasification, and then trimmed to a required size, so as to wrap the package electrical core 1a and the second bare electrical core 3 in the second punching pit 41 (i.e., in the containing case 42) of the aluminum-plastic film.

Step 140: and injecting a second electrolyte 34 into a second punching pit 41 of the second packaging shell 4, so that the second packaging shell 4 seals and packages the battery cell 1a, the second naked battery cell 3 and the second electrolyte 34.

Specifically, the top-side closing process is performed on the housing groove 420 of the second package 4. Baking the packaging cover 43 of the second packaging shell 4 and the adhesive layer at the edge of the accommodating shell 42. The second electrolyte 34 is injected into the accommodating case 42 of the second package 4, and the material of the second electrolyte 34 can refer to the above description. The electrode core assembly 101 is obtained after formation, secondary vacuum-pumping packaging, edge cutting, air bag reduction, gas release and volume grading.

Step 150: a battery assembly 10 is formed.

Specifically, the sub-tab of the encapsulated cell 1a is electrically connected to the sub-tab of the second bare cell 3, so as to form the first tab 101a and the second tab 101b of the cell assembly 101. A protective plate 102 is prepared and the protective plate 102 is electrically connected to the first tab 101a and the second tab 101 b. The protective plate 102 may be wrapped within the second enclosure 4 to form the battery assembly 10.

According to the preparation method of the battery assembly 10 provided by the embodiment of the application, the first naked battery cell 1 and the first packaging shell 2 are prepared, the first punching pit 21 is formed on the first packaging shell 2, and the first naked battery cell 1 is arranged in the first punching pit 21; injecting a first electrolyte 14 into a first pit 21 of the first packaging shell 2, so that the first packaging shell 2 seals the first naked battery cell 1 and the first electrolyte 14 to form a packaging battery cell 1 a; preparing a second naked battery cell 3 and a second packaging shell 4, forming a second punching pit 41 on the second packaging shell 4, and arranging the packaged battery cell 1a and the second naked battery cell 3 in the second punching pit 41; injecting a second electrolyte 34 into a second pit 41 of the second packaging shell 4, so that the second packaging shell 4 seals and packages the battery cell 1a, the second bare battery cell 3 and the second electrolyte 34; forming battery assembly 10, through the above-mentioned method, first encapsulation shell 2 closely wraps up first naked electric core 1 after through the evacuation, form small encapsulation electric core 1a, second encapsulation shell 4 closely wraps up second naked electric core 3 and encapsulation electric core 1a after through the evacuation, in order to form closely encapsulated encapsulation electric core 1a and outer encapsulation electric core 3a, the compactness of electric core assembly 101 has been improved, electric core assembly 101 has two electric core structures, can improve the capacity of electric core assembly 101 and reduce the space waste of electric core assembly 101 to the at utmost, improve the capacity of electric core assembly 101 and promote the miniaturization of electric core assembly 101.

The embodiment of the application also provides a battery pack 10 prepared by the preparation method.

The embodiment of the present application further provides an electronic device 100, which includes the battery assembly 10 according to any one of the above-mentioned embodiments.

Referring to fig. 10, the electronic device 100 further includes a signal enhancement circuit 61, a direct charging circuit 62, and a controller (not shown). The signal enhancement circuit 61 is electrically connected between the adapter 300 and the battery assembly 10. The dc charging circuit 62 is electrically connected between the adapter 300 and the battery assembly 10. The controller is used for controlling the signal enhancement circuit 61 to be electrically connected with the battery assembly 10 when the battery assembly 10 is in the first charging mode, or controlling the direct charging circuit 62 to be electrically connected with the battery assembly 10 when the battery assembly 10 is in the second charging mode.

Wherein the input voltage in the first charging mode is less than the rated charging voltage of the battery assembly 10. The input voltage in the second charging mode is greater than or equal to the nominal charging voltage of the battery assembly 10. The electronic apparatus 100 is electrically connected to an external power source via an adapter 300 (which may also be referred to as a charger). There are various kinds of adapters 300, including a first adapter that outputs a voltage smaller than the charging voltage of the battery assembly 10 or a second adapter that outputs a voltage greater than or equal to the charging voltage of the battery assembly 10. For example, the charging voltage of the battery pack 10 is 10v, the output voltage of the first adapter is 5v, and the output voltage of the second adapter is 10 v. When the electronic device 100 is charged through the first adapter, the electronic device 100 is charged in the first charging mode. When the electronic device 100 is charged through the second adapter, the electronic device 100 is charged in the second charging mode. Specifically, the electronic device 100 further includes a control switch (not shown), and the controller is configured to control the control switch to turn on the signal enhancement circuit 61 and the battery assembly 10, turn off the direct charging circuit 62 and the battery assembly 10 in the first charging mode, and control the control switch to turn on the direct charging circuit 62 and the battery assembly 10, and turn off the signal enhancement circuit 61 and the battery assembly 10 in the second charging mode.

Further, the electronic device 100 also includes a signal reduction circuit 64. The signal reduction circuit 64 is electrically connected between the battery assembly 10 and the terminal load system 400. The controller is also configured to control the signal reduction circuit 64 to electrically connect the battery assembly 10 when the battery assembly 10 is in the discharging mode, so as to reduce the output signal of the battery assembly 10 to a tolerable range of the terminal load system 400.

Referring to fig. 18, in an embodiment, the packaged cell 1a and the second bare cell 3 are arranged in series. The signal enhancement circuit 61 includes a boosting circuit 611. The voltage boost circuit 611 is configured to increase the charging voltage of the battery assembly 10 when the packaged electric core 1a and the second bare electric core 3 are arranged in series.

Referring to fig. 18, the signal reduction circuit 64 includes a voltage reduction circuit 641, and the voltage reduction circuit 641 is configured to reduce the discharge voltage of the battery assembly 10 when the packaged electric core 1a and the second bare electric core 3 are disposed in series. The buck circuit 641 includes, but is not limited to, a buck charge pump.

The amplification factor of the voltage signal by the voltage boosting circuit 611 may be determined according to the voltage of the voltage signal output by the adapter and the voltage of the battery pack 10. For example, the output voltage of the adapter is 5V, the battery is formed by connecting two bare cells in series, that is, the voltage of the battery assembly 10 is 10V, and the voltage boosting multiple of the voltage boosting circuit 611 is 2 times; battery pack 10 is established ties by three naked electric cores, and it is also that battery pack 10 voltage is 15V, and boost circuit 611 is that the boost multiple is 3 times this moment. Illustratively, the boost circuit 611 includes, but is not limited to, a boost charge pump. The voltage-reducing circuit 641 is configured to reduce the voltage of the battery pack 10 of 10V to 5V and output the voltage to the terminal load system 400.

For example, during charging: when the adapter voltage can output 10V at maximum, the adapter can support the direct charging of the series battery assembly 10, that is, when the electronic device 100 is charged through the second adapter, the series dual-battery assembly 101 is directly charged through the direct charging circuit 62. When the adapter is a common adapter, such as 5V1A or 5V2A adapter, which cannot support direct charging of the series-connected battery assembly 10, the series-connected dual-battery assembly 101 is charged through the voltage boosting circuit 611.

Referring to fig. 19, in another embodiment, the packaged cell 1a and the second bare cell 3 are disposed in parallel.

The signal enhancement circuit 61 includes a current boost circuit 612. The current increasing circuit 612 is configured to increase a charging current input to the battery assembly 10 when the packaged electric core 1a and the second bare electric core 3 are arranged in parallel, so as to increase a charging rate of the battery assembly 10. The current boost circuit 612 functions during charging in a manner similar to the boost circuit 611, and the current boost circuit 612 includes, but is not limited to, a current amplifier.

The signal attenuation circuit 64 includes a current reduction circuit 642, where the current reduction circuit 642 is configured to reduce a discharge current of the battery assembly 10 when the packaged electric core 1a is disposed in parallel with the second bare electric core 3, so as to meet an output specification of the battery assembly 10. The current reduction circuit 642 includes, but is not limited to, a selection switch and a plurality of loads, and the current reduction in the circuit can be realized by increasing the resistance value of the load in the circuit.

During the discharge process: the load in the switch selection circuit or the voltage reduction circuit 641 is controlled to reduce the voltage of the circuit and then supply power to the terminal load system 400 of the electronic device 100, and at this time, the voltage and the current are both consistent with the single-core state.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the principles of the application, and it is intended that such changes and modifications be covered by the scope of the application.

Claims

1. A battery assembly, comprising:

a first bare cell;

a second bare cell disposed adjacent to the encapsulated cell; and

2. The battery assembly of claim 1, further comprising a first electrolyte and a second electrolyte, wherein the first electrolyte is filled in the first encapsulant and the second electrolyte is filled in the second encapsulant, and the first encapsulant is configured to block the first electrolyte from the second electrolyte.

3. The battery assembly of claim 1, wherein the first encapsulant comprises at least one of aluminum, copper, and nickel.

4. The battery assembly of claim 1, wherein the capacity of the second bare cell is the same as or differs from the capacity of the encapsulated cell by less than a first preset value, the first preset value being 5% of the capacity of the second bare cell or 5% of the capacity of the encapsulated cell.

5. The battery assembly of claim 1, wherein a volume of the second bare cell is less than a volume of the encapsulated cell; and/or, the volume of the naked electric core of second equals the volume of the naked electric core of first.

6. The battery assembly of claim 5, wherein the encapsulated cell is stacked with the second bare cell, the second bare cell having a thickness that is less than a thickness of the encapsulated cell.

7. The battery assembly of claim 6, wherein the exterior surface of the encapsulated cell comprises a plurality of cell sides connected end to end in sequence; the outer surface of the second naked electric core also comprises a plurality of naked electric core side surfaces which are sequentially connected end to end; at least one the electricity core side with correspond naked electric core side flushes.

8. The battery assembly of claim 5, wherein the encapsulated cell is disposed side-by-side with the second bare cell, the second bare cell having an area that is smaller than an area of the encapsulated cell.

9. The battery assembly of claim 8, wherein the exterior surface of the encapsulated cell comprises a back cell surface and a top cell surface that are disposed opposite each other, and the exterior surface of the second bare cell comprises a back bare cell surface and a top bare cell surface that are disposed opposite each other, the back cell surface being flush with the back bare cell surface, and the top cell surface being flush with the top bare cell surface.

10. The battery assembly of claim 1, wherein the first bare cell comprises a first positive plate and a first negative plate that are oppositely and insulatively arranged, a total area of the first positive plate and the first negative plate that are oppositely arranged is a first effective area, the second bare cell comprises a second positive plate and a second negative plate that are oppositely and insulatively arranged, a total area of the first positive plate and the second negative plate that are oppositely arranged is a second effective area, the first effective area and the second effective area are equal to or differ by less than a second predetermined value, and the second predetermined value is 5% of the first effective area or the second effective area.

11. The battery assembly of claim 1, further comprising a balancing module disposed outside the second encapsulant shell, the balancing module electrically connecting the encapsulated cell and the second bare cell, the balancing module configured to balance voltages of the encapsulated cell and the second bare cell when the encapsulated cell is connected in series with the second bare cell, and further configured to balance currents of the encapsulated cell and the second bare cell when the encapsulated cell is connected in parallel with the second bare cell.

12. The battery assembly according to any one of claims 1 to 11, wherein the second package casing comprises an integrally formed receiving casing and a package cover, a receiving slot is formed in the receiving casing, and the package battery cell and the second bare battery cell are attached to each other or are spaced in the receiving slot; the packaging cover covers the opening of the containing groove, and the edge of the packaging cover is connected with the edge of the containing shell in a sealing mode.

13. The battery assembly of claim 12, wherein the inner wall of the receiving cavity is provided with at least one barrier strip, the barrier strip separates the receiving cavity to form a first receiving cavity and a second receiving cavity, and the encapsulated cell and the second bare cell are respectively disposed in the first receiving cavity and the second receiving cavity;

the barrier strip is formed by the accommodating shell protruding towards the packaging cover, the surface of the barrier strip facing the packaging cover is abutted to the packaging cover or arranged at intervals, and the barrier strip bends when the packaging battery cell is bent relative to the second bare battery cell; alternatively, the first and second electrodes may be,

the convex inner wall of accepting groove of locating of blend stop, the blend stop includes first blend stop and the second blend stop of looks interval setting, encapsulation electric core is located first blend stop deviates from one side of second blend stop, the naked electric core of second is located the second blend stop deviates from one side of first blend stop, first blend stop with part between the second blend stop is in encapsulation electric core for the naked electric core of second takes place the bending when buckling.

14. The battery assembly of any of claims 1-11, wherein at least a portion of an outer surface of the first bare cell is conformed to an inner surface of the first encapsulant shell; and/or at least part of the outer surface of the encapsulated battery cell is attached to the inner surface of the second encapsulating shell; and/or at least part of the outer surface of the second naked battery cell is attached to the inner surface of the second packaging shell.

15. The battery assembly of any of claims 1-11, wherein the encapsulated cell comprises a first sub-tab and a second sub-tab; the first bare cell comprises a third sub-tab and a fourth sub-tab, the first sub-tab forms a first tab of the battery assembly, the fourth sub-tab forms a second tab of the battery assembly, the second sub-tab is electrically connected with the third sub-tab, when the packaged cell and the second bare cell are stacked, the distance between the first sub-tab and the second sub-tab is greater than the distance between the second sub-tab and the third sub-tab, and the distance between the third sub-tab and the fourth sub-tab is greater than the distance between the second sub-tab and the third sub-tab; or the first sub-tab is electrically connected with the third sub-tab and integrated with the first tab of the battery assembly, and the second sub-tab is electrically connected with the fourth sub-tab and integrated with the second tab of the battery assembly.

16. A method of making a battery assembly, comprising:

a battery assembly is formed.

17. A battery module produced by the production method according to claim 16.

18. An electronic device comprising the battery pack according to any one of claims 1 to 15 and 17.

19. The electronic device of claim 18, further comprising a signal enhancement circuit, a direct charging circuit, and a controller for controlling the signal enhancement circuit to electrically connect the battery assembly when the battery assembly is in a first charging mode; or the signal enhancement circuit is used for increasing the charging current of the battery assembly when the packaged electric core and the second bare electric core are arranged in parallel, or is used for increasing the charging voltage of the battery assembly when the packaged electric core and the second bare electric core are arranged in series; wherein the input voltage in the first charging mode is less than a nominal charging voltage of the battery assembly; the input voltage in the second charging mode is greater than or equal to a rated charging voltage of the battery assembly.

20. The electronic device of claim 19, further comprising a signal reduction circuit, wherein the controller is further configured to control the signal reduction circuit to electrically connect the battery assembly when the battery assembly is in a discharge mode, and wherein the signal reduction circuit is configured to reduce a discharge current of the battery assembly when the encapsulated cell is disposed in parallel with the second bare cell or is configured to reduce a discharge voltage of the battery assembly when the encapsulated cell is disposed in series with the second bare cell.