CN114421057A

CN114421057A - Battery module

Info

Publication number: CN114421057A
Application number: CN202111582247.5A
Authority: CN
Inventors: 聂永福; 朱红; 陈宾; 沈赟; 周海春
Original assignee: Anhui Anwa New Energy Technology Co ltd
Current assignee: Anhui Anwa New Energy Technology Co ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-04-29

Abstract

The invention discloses a battery module, which at least comprises: a cell frame; the battery core group row is fixed on the battery core frame; wherein, the electric core bank includes: the micro-battery cell comprises a negative plate, a diaphragm and a positive plate which are arranged in a stacked mode, a coating film is wrapped outside the micro-battery cell, and the diaphragm is located between the negative plate and the positive plate; and the heating sheet is attached to the covering film and stacked with the micro-cores in a row. The invention provides a battery module, which aims to solve the problem of batteries in a low-temperature environment.

Description

Battery module

Technical Field

The invention belongs to the technical field of batteries, and particularly relates to a battery module.

Background

The electric vehicle is a vehicle which runs by using a vehicle-mounted power supply as power and driving wheels by using a motor. Compared with a fuel automobile, the pure electric automobile mainly has the difference of four parts, namely a driving motor, a speed regulation controller, a power battery and a vehicle-mounted charger. With the development of electric automobiles, higher requirements are also put on the performance of power batteries, especially the low-temperature performance of the power batteries.

However, when the ambient temperature is low, the battery is not allowed to be charged, and the discharge energy and power output are drastically reduced.

Disclosure of Invention

The invention aims to provide a battery module to improve the working performance of a battery in a low-temperature environment.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention provides a battery module, which at least comprises:

a cell frame; and

the battery core group row is fixed on the battery core frame;

wherein, the electric core row includes:

the micro-battery cell comprises a negative plate, a diaphragm and a positive plate which are arranged in a stacked mode, a coating film wraps the outside of the micro-battery cell, and the diaphragm is located between the negative plate and the positive plate; and

and the heating sheets are attached to the covering film and stacked in rows.

In an embodiment of the present invention, the surfaces of the negative electrode tab and the positive electrode tab are coated with a semi-solid slurry.

In an embodiment of the present invention, the heating sheet is connected between the adjacent micro battery cells.

In an embodiment of the present invention, in the cell array, when the number of the micro cells is less than or equal to 15, the ratio of the number of the micro cells to the number of the heating plates is less than or equal to 5:1, and when the number of the micro cells is greater than 15, the ratio of the number of the micro cells to the number of the heating plates is greater than or equal to 5: 1.

In an embodiment of the present invention, in the cell group rows, the micro cells are connected in parallel, and the adjacent cell group rows are connected in series.

In an embodiment of the present invention, the number of the negative electrode plates is greater than or equal to the number of the positive electrode plates.

In an embodiment of the present invention, when the number of the negative electrode sheets is equal to that of the positive electrode sheets, a side of the positive electrode sheet opposite to the separator is coated with a positive electrode carrier film.

In an embodiment of the invention, the battery module further includes a bus bar, and the bus bar is electrically connected to the discharging end and the heating end of the electric core bar.

In one embodiment of the invention, the outer part of the electric core group row is wrapped by a soft film, and the soft film allows the heating end and the discharging end of the electric core group row to extend out.

In an embodiment of the present invention, the heating sheet is filament-shaped or sheet-shaped.

As described above, the battery module provided by the invention has better low-temperature adaptability, is beneficial to the heating uniformity of the battery core, realizes the internal heating of the battery core, and has the advantages of high heat utilization rate, low energy consumption and uniform heat or temperature distribution of the battery core during heating. The battery module has high temperature rise rate, can realize quick preheating of the battery cell on the basis of protecting the battery cell, can greatly reduce the damage of the heating sheet to the structure of the battery cell body under the condition that the battery is heated and adapted to a low-temperature environment, and has higher heating performance and higher safety. In addition, the battery module provided by the invention has high space utilization rate, and not only is the wiring of the heating plug-in regular, but also the energy density of the battery body is favorably improved. The battery module provided by the invention is easy to process and produce, simple in heating control logic, high in preheating efficiency, low in cost, capable of generating great economic benefit and especially suitable for new energy automobiles in low-temperature environments.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a hierarchical structure diagram of a micro cell.

Fig. 2 is a schematic diagram of a stacked structure of micro cells and electrode sheets.

FIG. 3 is a schematic view of a battery module according to the present invention

Fig. 4 is a schematic view of a package structure of a microelectronic die.

Fig. 5 is a schematic view of another packaging structure of a micro cell.

Fig. 6 is a schematic diagram illustrating a heat conduction path in the battery module.

Fig. 7 is a schematic diagram of a heating circuit of the battery cell.

Fig. 8 is a manufacturing flowchart of the battery module.

Description of reference numerals: 1 micro battery cell, 11 soft package battery cells, 12 hard shell battery cells, 121 explosion-proof valve, 2 heating plates, 21 first electrode lug, 22 second electrode lug, 23 heating pole column, 3 battery cell rows, 31 heating unit, 4 battery modules, 41 module frames, 42 battery cell frames, 43 heating bus bars, 44 switching wire harness, 45 heating plug-in units, 46 high-voltage bus bars, 47 reinforcing plates, 100 negative pole carrier films, 200 negative pole sheets, 201 negative pole electrode lugs, 300 diaphragms, 400 positive pole sheets, 401 positive pole lugs, 402 positive pole columns, 500 positive pole carrier films and 600 laminating films.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

New energy vehicles such as electric vehicles, electric trains, electric bicycles and golf carts drive vehicles by using electric energy, are rich in electric energy resources, have renewable characteristics, can be used for ever and are cleaner and more environment-friendly compared with fuels, so that the new energy vehicles have great research value. The new energy vehicle has the problem of reduced working performance in a low-temperature environment, and therefore the invention provides the battery module 4 which is applied to new energy equipment such as the new energy vehicle and can improve the problem of reduced working performance of the new energy equipment in the low-temperature environment.

Referring to fig. 1-5, the present invention provides a battery module 4, in which the battery module 4 includes a cell frame 42, a cell group 3, and a bus bar. Wherein the cell group row 3 is fixed on the cell frame 42. The busbar includes heating busbar 43 and high voltage bus 46, and electric core group 3 is provided with heating end and discharge end, and electric core group 3's heating end electric connection in heating busbar 43, and electric core group 3's discharge end electric connection in high voltage bus 46. The electric core row 3 comprises a micro electric core 1 and a heating plate 2, the micro electric core 1 comprises a negative plate 200, a diaphragm 300 and a positive plate 400 which are sequentially stacked, and the outside of the micro electric core 1 is wrapped by a coating film 600. Wherein the separator is positioned between the negative electrode tab 200 and the positive electrode tab 400. The heating sheet 2 is attached to the cover film 600, and the heating sheet 2 and the micro battery cells 1 are stacked in a row.

Referring to fig. 1-5, in different embodiments, the battery module 4 provided in the present invention can be applied to different electronic devices or electronic apparatuses, such as a power battery of an electric vehicle, i.e., a power source for providing power for a tool, such as a battery for providing power for an electric vehicle, an electric train, an electric bicycle, and a golf cart. And the power battery may be, for example, a valve-port sealed lead-acid battery, an open-type tubular lead-acid battery, and a lithium iron phosphate battery. With the decrease of the ambient temperature, the battery module 4 of the present invention can maintain the ambient temperature of the battery, so as to improve the problem of the low-temperature battery capacity attenuation of the electronic device or electronic apparatus. For example, the battery module can stabilize the discharge voltage of the battery and stabilize the power of the battery along with the reduction of the ambient temperature, so that the phenomenon that the battery rapidly reaches the cut-off voltage along with the reduction of the temperature to cause the reduction of the capacity of the battery is avoided. For example, in a low-temperature environment, the attenuation of available energy and power is relatively severe, and the long-term use in the low-temperature environment accelerates the aging of the power battery and shortens the service life. The battery module 4 provided by the invention can effectively improve the working performance of batteries such as lithium ion batteries, thick electrode batteries, dry electrode batteries, solid-state batteries, sodium ion batteries and the like in a low-temperature environment, and effectively prolong the service life of the batteries.

Referring to fig. 1 to 5, in an embodiment of the invention, the micro-electrical core 1 includes a negative electrode sheet 200, a separator 300 connected to one side of the negative electrode sheet 200, a positive electrode sheet 400 connected to one side of the separator 300 opposite to the negative electrode sheet 200, and a cover film 600 covering the negative electrode sheet 200, the separator 300, and the positive electrode sheet 400. One end of the negative plate 200 is provided with a negative tab 201, and one end of the positive plate 400 is provided with a positive tab 401. The coating film 600 is attached to the heating sheet, and the coating film 600 allows the anode tab 201 and the cathode tab 401 to protrude.

Referring to fig. 1, in an embodiment of the invention, the micro-electrical core 1 further includes a negative carrier film 100 and a positive carrier film 500. The negative electrode carrier film 100 is connected to the negative electrode tab 200 on the side facing the separator 300, and the positive electrode carrier film 500 is connected to the positive electrode tab 400 on the side facing the separator 300. The negative electrode carrier film 100 and the positive electrode carrier film 500 function to carry the negative electrode tab 200 and the positive electrode tab 400, respectively, and the area of the negative electrode carrier film 100 is equal to or larger than the area of the negative electrode tab 200 so as to carry the negative electrode tab 200. The area of the positive electrode carrier film 500 is equal to or larger than the area of the positive electrode sheet 400 so as to support the positive electrode sheet 400.

Referring to fig. 1, in an embodiment of the present invention, the materials of the negative carrier film 100 and the positive carrier film 500 are the same, and the negative carrier film 100 and the positive carrier film 500 may be a composite of one or more of polyethylene terephthalate, low density polyethylene, polypropylene, Ethylene Vinyl Acetate Copolymer (EVA), Ethylene Acrylic Acid Copolymer (EAA), Ethylene methacrylic Acid Copolymer, Proton Exchange Membrane (PEM), polyimide, Ethylene tetrafluoroethylene Copolymer, meltable Polytetrafluoroethylene (PFA), polytetrafluoroethylene, fluorinated Ethylene propylene Copolymer, and Ethylene chlorotrifluoroethylene Copolymer. For example, ethylene acrylic acid copolymer may be directly used as the material of the negative electrode carrier film 100 and the positive electrode carrier film 500 to obtain a carrier film with good toughness and metal adhesion. For example, under the condition of better toughness and heat resistance, other materials are added to compensate the metal adhesion of the original material, so as to obtain a carrier film with better heat resistance, toughness and metal adhesion. The material and the compounding ratio of the carrier film are adjusted according to the requirements of the battery module 4 to obtain the negative electrode carrier film 100 and the positive electrode carrier film 500, and then the negative electrode sheet 200 and the negative electrode carrier film 100 are bonded, and the positive electrode sheet 400 and the positive electrode carrier film 500 are bonded. In the microchip 1, the separator 300 is a film having good insulating properties and good ion permeability, so as to facilitate ion communication between the positive electrode sheet 400 and the negative electrode sheet 200.

Referring to fig. 1, in one embodiment of the present invention, the negative electrode tab 200 and the positive electrode tab 400 have the same area, and the negative electrode tab 200 and the positive electrode tab 400 are overlapped with each other. The surfaces of the negative electrode tab 200 and the positive electrode tab 400 are coated with the semi-solid slurry. The semi-solid slurry is also coated on the positive electrode tab 401 and the negative electrode tab 201. The semi-solid slurry coated on the positive plate 400 comprises an adhesive, a conductive agent and a positive electrode material, and the semi-solid slurry coated on the negative plate 200 comprises an adhesive and graphite carbon powder. In the slurry coated on the positive electrode sheet 400 and the negative electrode sheet 200, the dispersibility and uniformity of the particulate active material directly affect, for example, the movement of lithium ions between the two electrodes of the battery, and thus the mixing and dispersion of the slurry of each electrode sheet material is important in, for example, the production of lithium ion batteries. The quality of the slurry dispersion directly affects the quality of the subsequent lithium ion battery production and the performance of the product. In this embodiment, the semi-solid state is a liquid state obtained by vigorously stirring the metal in the solidification process and controlling the solid-liquid temperature range, and a solid-liquid mixed slurry of a certain solid phase component is uniformly suspended in the metal mother liquid. Therefore, the semi-solid slurry is advantageous to the dispersibility and uniformity of the granular active materials in the slurry, so that the micro-cell 1 has excellent discharge capacity.

Referring to fig. 1, in one embodiment of the present invention, the pole piece and the carrier film may be bonded and then die cut so that the carrier film covers the pole piece. Specifically, the metal foil used for the pole piece is taken, after the surface of the metal foil is coated with the semi-solid slurry, the pole piece is bonded with the carrier film, and finally, the composite pole piece and the carrier film are subjected to die cutting to obtain the negative pole piece 200, the negative pole carrier film 100, the positive pole piece 400 and the positive pole carrier film 500. The separator 300 was then stacked and assembled in the order of the negative electrode carrier film 100, the negative electrode sheet 200, the separator 300, the positive electrode sheet 400, and the positive electrode carrier film 500. And taking the coating 600, and wrapping the coating 600 outside the stacking assembly to obtain the micro battery cell 1. The process of wrapping the stacked assembly with the coating 600 may be winding a circle first to expose the two ends of the negative plate 200 and the positive plate 400, that is, to expose the positive tab 401 and the negative tab 201, and to expose the position where the heating tab is connected. Firstly, the extension of the positive electrode lug 401 and the negative electrode lug 201 is ensured, then the film 600 is used for wrapping and sealing one side of the micro battery cell 1 where the positive electrode lug 401 and the negative electrode lug 201 are located, and then the film 600 is used for sealing one end of the micro battery cell 1 where the heating lug is ready to be connected. And then the heating plate 2 is connected to the position of the micro-battery core 1 ready to be connected with a heating lug, and the heating lug is led out from the heating plate 2. And after the heating lug is connected, wrapping and sealing one side of the micro battery cell 1 where the heating lug is positioned to obtain a finished micro battery cell 1. The positive electrode lug 401, the negative electrode lug 201 and the heating lugs are positioned on two sides of the micro battery core 1. Wherein, the access position of heating utmost point ear can be adjusted according to anodal utmost point ear 401, the position of negative pole utmost point ear 201 to the lead wire of convenient utmost point ear.

Referring to fig. 1, in one embodiment of the invention, the number of the negative electrode tabs 200 and the positive electrode tabs 400 is equal in the micro-battery cell 1. In other embodiments of the present invention, the number of the negative electrode tabs 200 may be more than the number of the positive electrode tabs 400. Specifically, when the number of the positive electrode tabs 400 is, for example, N, the number of the negative electrode tabs 200 is N +1, where N ≧ 1. And in the arrangement of the positive electrode tab 400 and the negative electrode tab 200 in the micro-battery cell 1, the negative electrode tabs 200 are located on both sides. In the present embodiment, when the number of the positive electrode sheets 400 is, for example, 1, the number of the negative electrode sheets 200 may be, for example, 1, and the cross-sectional structures of the micro battery cells 1 are the coating 600, the negative electrode carrier film 100, the negative electrode sheets 200, the separator 300, the positive electrode sheets 400, the positive electrode carrier film 500, and the coating 600. In other embodiments, when the number of the positive electrode tabs 400 is, for example, 1, the number of the negative electrode tabs 200 may be, for example, 2, and the cross-sectional structures of the micro-electrical cores 1 are the cover film 600, the negative electrode carrier film 100, the negative electrode tabs 200, the separator 300, the positive electrode tabs 400, the separator 300, the negative electrode tabs 200, the negative electrode carrier film 100, and the cover film 600. When the number of the negative electrode tabs 200 is greater than that of the positive electrode tabs 400, the positive electrode carrier film 500 may be removed, and the semi-solid slurry may be coated on both sides of the positive electrode tabs 400 to form two times of cells. When obtaining expanding on the electric quantity, compare the electric core of equal discharge capacity, two negative pole pieces 200 are littleer on heating area, are favorable to promoting the energy density of battery and are favorable to the battery to realize quick heating.

Referring to fig. 1, the material of the coating film 600 is a material with good toughness, good sealing performance, high temperature resistance and corrosion resistance, so as to protect the negative electrode sheet 200 and the positive electrode sheet 400, and prevent the coating layers of the negative electrode sheet 200 and the positive electrode sheet 400 from being damaged by the electrolyte. The micro battery cell 1 wraps the negative pole piece 200 and the positive pole piece 400 through the film 600, when a plurality of micro battery cells 1 are stacked, the micro battery cells can be directly stacked, the alignment process is omitted, the stacking efficiency of the micro battery cells 1 is improved, and the situation that the positive pole piece 200 and the negative pole piece 200 are not aligned due to the displacement of the pole pieces in practical application is also avoided. Therefore, the arrangement of the heating plate 2 can be transferred to the production line of the battery cell for operation, the stacking efficiency of the micro battery cell 1 is high, the change of the production line is reduced, and the large-scale production is facilitated.

Referring to fig. 1, in an embodiment of the present invention, the micro-battery core 1 may be in a shape of a sheet, and the heating plate 2 is connected to a side surface of the micro-battery core 1, and specifically, the heating plate 2 is connected to an outside of the cover film 600. The heating plate 2 may be connected to the outside of the micro battery cells 1, or may be connected between the micro battery cells 1. After the heating plate 2 is connected to the micro battery core 1, a heating tab is connected to the heating plate 2, wherein the connection mode of the heating tab may be welding. In other embodiments, the heating sheets 2 may not be directly connected to the micro-electrical cores 1, and the heating sheets 2 may be disposed between the micro-electrical cores 1. When heating, the heating of the micro battery core 1 is completed in a heat conduction mode.

Referring to fig. 1 and 3, in an embodiment of the present invention, the number of the heating sheets 2 connected to the micro battery cell 1 may be, for example, 1, and two heating tabs, namely, a first tab 21 and a second tab 22, are fixed on the heating sheets 2. In other embodiments of the present invention, the number of the heating sheets 2 may be 2, for example, and two heating sheets 2 are respectively connected to the first tab 21 and the second tab 22. In the micro-electrical core 1, the positive electrode tab 401 and the negative electrode tab 201 are connected, and then the ion communication between the negative electrode sheet 200 and the positive electrode sheet 400 is matched to form a complete loop. When a plurality of micro-cells 1 are stacked, the positive electrode tab 401 of a first micro-cell 1 may be connected to the negative electrode tab 201 of a second micro-cell 1, and a plurality of micro-cells 1 may be connected in series. Likewise, the first tab 21 of the first heater chip 2 and the second tab 22 of the second heater chip 2 may be connected, so that the stacked plurality of heater chips 2 are also connected in series, thereby obtaining a total cell. In other embodiments, in the total electrical core 1, the stacked heating sheets 2 may also be connected in parallel, where the first tab 21 of the first heating sheet 2 is connected to the first tab 21 of the second heating sheet 2, and then the first tab 21 and the second tab 22 on the same heating sheet 2 are connected. When heating, through the leading-in electric current of the heating utmost point ear at both ends, heat direct transfer for little electric core 1 of contact behind the heating plate 2 heating, continues the transfer heat again between little electric core 1 to the completion is right the heating of total electric core. After the heating plate 2 is heated, the heat is also transferred to the air, so that the ambient temperature is increased, and heat exchange is performed with the micro battery core 1. In the heating process of total electric core, heating structure sets up inside electric core, has reduced heat transfer device's structure, can make the electrode slice preheated fast through shorter heat-conduction route to reduce the loss of heat in the conduction process, promote thermal utilization ratio. Therefore, the battery module 4 of the present invention has better adaptability in a low-temperature environment, and the safety of the heating structure using the heating sheet 2 is also higher.

Referring to fig. 1, in an embodiment of the present invention, inorganic and organic materials having good thermal conductivity and insulation properties, such as thermal conductive silicone, polyimide film, thermal conductive silicone, etc., are plated or coated on the exterior of the heating plate 2 to improve the electrical conductivity of the heating plate 2. Directly set up heat conduction structure on heating plate 2 to be connected heating plate 2 and little electric core 1, assemble in bank, thereby formed an interior heating electric core, realized the internal heating of battery. The material of the heating plate 2 may be one or a composite metal of copper, nickel, platinum, etc., and the heating plate 2 is a filament or a sheet structure. When the heating sheet 2 is a heating wire, the heating wire may be welded or wound on the outer wall of the micro electric core 1 (the coating 600). When the heating sheet 2 is in a sheet shape, the heating wire may be wound on, for example, a mica sheet, and the heating sheet 2 made of the mica sheet may be attached to the micro-electric core 1 or stacked and sandwiched between adjacent micro-electric cores 1.

Referring to fig. 1, fig. 3 and fig. 4, in an embodiment of the present invention, the packaging structure of the stacked micro cells 1 may be a flexible film package, so that the stacked micro cells become flexible package cells 11. For example, the flexible film encapsulating the stacked micro cells 1 may be an aluminum plastic film. In other embodiments, the packaging structure of the stacked plurality of micro cells 1 may be a hard-shell package, so that it becomes a hard-shell cell 12. For example, the hard shell encapsulating the stacked microcell 1 may be a steel or aluminum shell. The stacked package shape of the micro-battery cell 1 may be a cylinder. The number of the micro cells 1 included in the total cell is determined according to the electric quantity requirement of the battery. The structure of the micro-battery cell 1 is beneficial to flexibly stacking different packages so as to change the heat distribution when the battery is heated and avoid the phenomenon that the service life of the battery cell is influenced due to obvious heat gradient. Moreover, the battery module 4 based on the micro battery cell 1 not only improves the uniformity of heating, but also can be flexibly adapted to various application occasions of vehicles.

Referring to fig. 1, fig. 3 and fig. 4, in an embodiment of the present invention, when the micro battery cell 1 is packaged as a soft-package battery cell 11, two ends of the soft-package battery cell 11 respectively extend out of the positive electrode tab 401, the negative electrode tab 201, and the first electrode tab 21 and the second electrode tab 22. The safety of soft-packaged electrical core 11 heating is high, and the internal resistance is little, reduces the heating loss. When the encapsulation of the micro-battery cell 1 is the hard-shell battery cell 12, the positive electrode post 402, the heating electrode post 23 and the explosion-proof valve 121 are arranged at one end of the hard-shell battery cell 12. The hard shell cell 12 has a high energy density.

Referring to fig. 1 and 2, the number of the heating plates 2 in the total electric core and the distribution of the heating plates 2 in the total electric core may be determined according to the thickness of the total electric core 1 or the number of the micro-electric cores 1. If the number of stacked micro cells 1 in the total cell is less than or equal to 15, for example, the number of the heating plates 2 is 3, for example, so that the ratio of the number of the micro cells 1 to the number of the heating plates 2 is less than or equal to 5:1, for example, to maintain the heating efficiency of the micro cells 1. When the number of stacked micro-electric cores 1 in the total electric core is larger than 15 sheets, for example, the ratio of the number of the micro-electric cores 1 to the number of the heating sheets 2 is larger than or equal to 5: 1. When the number of the micro battery cells 1 is larger than 15, for example, the thickness of the battery cell group 3 is larger, and in the total battery cell 1, for example, 1 heating plate is arranged every other, for example, 5 micro battery cells, so as to adapt to the heating of the battery cells in a low-temperature environment, and when the total battery cell is heated, the heat inside the total battery cell can be uniformly conducted, so that a larger temperature gradient of the total battery cell in the heating process is avoided, and the service life of the micro battery cell 1 is ensured.

Referring to fig. 1 to 3, in an embodiment of the present invention, the cell array 3 includes a plurality of the packaged total cells. In the electric core group row 3, the packaged total electric core is used as a heating unit, and the electric core group row 3 comprises a plurality of heating units. In the present embodiment, the electric core row 3 may be internally heated, and power is supplied to the heating pole 23 or the first and

second pole tabs

21 and 22 to achieve internal heating of the battery module 4. The internal heating structure of the battery module 4 reduces the external heat transfer space. In the limited vehicle body space, the reduction of the external heat transfer member provides a space for the battery module 4, which is advantageous for improving the energy density of the battery module 4.

Referring to fig. 1 to 5, in an embodiment of the present invention, the battery module 4 includes a plurality of cell groups 3, a module frame 41, a cell frame 42 detachably connected to the module frame 41, a heating bus bar 43 connected to the cell frame 42, and a high voltage bus bar 46 connected to the cell frame 42. Wherein, the electric core group row 3 is fixed in the electric core frame 42, and the electric core group row 3 is wired to the heating bus bar 43 and the high voltage bus bar 46. The heating bus bar 43 and the high-voltage bus bar 46 have the same structure. When the battery is heated, the heating current is converged to the heating bus bar 43, and when the battery is discharged, the discharge current is converged to the high voltage bus bar 46. The electric core assembly 3 can be connected to the bus bar through the heating pole 23, the positive pole 402, or the like, or can be connected to the bus bar through the positive pole tab 401, the negative pole tab 201, the first pole tab 21, and the second pole tab 22.

Referring to fig. 3 to 5, in an embodiment of the present invention, the positive tab 401 and the negative tab 201 may be electrically connected through the heating bus bar 43 and the high voltage bus bar 46, and the electrical connection may be in a series connection form, a parallel connection form, or a combination of the series connection and the parallel connection form. The connection of the positive tab 401 and the negative tab 201 can be fixed to the heating busbar 43 and the high-voltage busbar 46 by bolting or welding. The heating tabs may also be secured to the heating bus bar 43 by bolting or welding. When connecting the heating structure of different battery modules 4, can be connected the heating busbar 43 of different battery modules 4, also can use switching pencil 44 and heating plug-in 45 to connect, wherein, the installation of battery module 4 is convenient for to the connected mode of switching pencil 44 and heating plug-in 45, and can promote the assembly efficiency of battery, consequently can prefer the connection scheme of heating switching pencil 44 and heating plug-in 45.

Referring to fig. 5 to 7, in the battery module 4, the internal heating of the core pack row 3 may lead the switching harness 44 from the heating unit. Wherein one end of the transit harness 44 is connected to the heating bus bar 43, and the other end of the transit harness 44 is connected to the heating plug-in 45, so as to facilitate the heating operation and the assembly of the battery module 4. Wherein, can gather into the electric current from the middle part of electric core group row 3, the direction of heat conduction can evenly spread when making the battery heating, is favorable to the inside even heating of battery, and is favorable to promoting the preheating efficiency of battery. In other embodiments of the present invention, it is allowed to add an external component to externally heat the battery module 4, or to heat the internal battery and the external battery together.

Referring to fig. 1, 5 and 8, the present invention provides a method for manufacturing a battery module 4, wherein the method for manufacturing the battery module 4 includes the following steps:

and S1, manufacturing the micro battery cell 1.

And S2, stacking the micro battery cells 1 and packaging to obtain the internal heating battery cells.

S3, the battery module 4 is formed.

Referring to fig. 1, 3, and 8, in step S1, a metal foil used for manufacturing the negative electrode sheet 200 and the positive electrode sheet 400 is taken, a carrier film used for the negative electrode carrier film 100 and the positive electrode carrier film 500 is taken, the carrier films are attached to one side of the metal foil, and bubbles generated by attachment are removed. And compounding the compounded metal foil and the carrier film, and performing die cutting according to the sizes of the negative electrode sheet 200 and the positive electrode sheet 400 to obtain the negative electrode sheet 200 and the positive electrode sheet 400. The semi-solid slurry is coated on one side of the negative electrode tab 200 and the positive electrode tab 400, which is opposite to the carrier film. And coating the semi-solid slurry on the negative electrode tab 201 and the positive electrode tab 401, and respectively connecting the positive electrode tab 401 and the negative electrode tab 201 to the positive plate 400 and the negative electrode tab 200 to obtain the loaded negative electrode plate 200 and the loaded positive electrode plate 400. The loaded negative plate 200, separator 300, and loaded positive plate 400 are stacked together in order to form a primary stacked micro-electrical package. And winding and wrapping the primary stacked micro-core assembly by using a film 600 to obtain a micro-core 1.

Referring to fig. 1 and 8, in an embodiment of the invention, in step S2, the heating plate 2 is connected to the micro cells 1, and then the micro cells 1 are stacked together, where the heating plate 2 may be connected to the outside of the micro cells 1 or connected between the micro cells 1. In other embodiments, the heating sheet 2 and the micro-electric core 1 may be stacked together to obtain a total electric core. And after the stacking is finished, welding the heating lug and the conductive handle to obtain the naked battery cell. And packaging the naked battery cell, and chemically activating and testing the naked battery cell to obtain an internal heating battery cell.

Referring to fig. 1 and 5, in one embodiment of the present invention, the internally heated cells are connected in groups by a gluing process or connected in groups by a cell frame 42. And then stacking and connecting the inner heating electric cores in groups and aligning the inner heating electric cores. The cell frame 42 is mounted on the module frame 41, and then the high-voltage bus bar 46 and the heating bus bar 43 are mounted, wherein the mounting manner can be welding or bolt connection. And a low-voltage collection system, a heating lead-out system and the like are arranged on the module frame 41. A reinforcing plate 47, a protective frame, and the like are mounted on the outside of the module frame 41, thereby obtaining the battery module 4. The low-voltage acquisition system is an information acquisition system and is used for acquiring the working condition of the battery module 4 and collecting information such as voltage and temperature of the battery module 4. The battery modules 4 may be connected by a metal connection bar or may be bolted by a wire harness.

Referring to fig. 1 and 5, a battery module 4 according to the present invention may be a semi-solid lithium ion battery, a thick electrode battery, a dry electrode battery, a solid battery, or a sodium ion battery. Particularly in thick-electrode batteries, the battery module 4 structure provided by the invention has better low-temperature adaptability and is beneficial to the heating uniformity of the battery core. In addition, the battery module 4 provided by the invention realizes internal heating of the battery core, and has the advantages of high heat utilization rate, low energy consumption and uniform heat or temperature distribution of battery core heating. And the temperature rise rate of the battery module 4 is high, and the battery core can be quickly preheated on the basis of protecting the battery core. According to the battery module 4, the internal heating structure of the heating sheet is arranged in the micro battery core, so that the damage of the heating sheet to the structure of the battery core body can be greatly reduced under the condition that the heating in the battery is adaptive to a low-temperature environment, and the battery core is higher in heating performance and safer. In addition, the invention provides the battery module 4 based on the micro-battery core 1, the space utilization rate is high, the wiring of the heating plug-in 45 is regular, and the energy density of the battery body is favorably improved. Therefore, the battery module 4 provided by the invention is easy to process and produce, simple in heating control logic, high in preheating efficiency, low in cost and capable of generating huge economic benefits, and is particularly suitable for new energy automobiles in low-temperature environments.

Referring to fig. 1 to 8, in the battery module 4 according to the present invention, the battery module 4 can be applied to an electronic device or an electronic apparatus, for example, as a power battery of a new energy vehicle. The battery module 4 can be applied to the automobile and motorcycle industries, and mainly supplies electric energy for starting ignition of an engine and use of vehicle-mounted electronic equipment. The battery module 4 can also be applied to the industries of electric automobiles and electric bicycles to replace gasoline and diesel oil to be used as a driving power supply of the electric automobiles or the electric bicycles. The battery module 4 can also be applied to an industrial power system and used for providing closing current for a power unit in a power transmission and transformation station. The battery module 4 may also provide a backup power source and a communication power source for public facilities. And the battery module 4 can exhibit a good cruising ability in a low-temperature environment.

In the description of the present specification, reference to the description of the terms "present embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A battery module, characterized in that it includes at least:

a cell frame; and

the battery core group row is fixed on the battery core frame;

wherein, the electric core row includes:

and the heating sheet is attached to the covering film.

2. The battery module according to claim 1, wherein the surfaces of the negative electrode tab and the positive electrode tab are coated with semi-solid slurry.

3. The battery module according to claim 1, wherein the heating sheet is connected between the adjacent micro-cells.

4. The battery module according to claim 1, wherein in the cell array, when the number of the micro cells is less than or equal to 15, the ratio of the number of the micro cells to the number of the heating plates is less than or equal to 5:1, and when the number of the micro cells is greater than 15, the ratio of the number of the micro cells to the number of the heating plates is greater than or equal to 5: 1.

5. The battery module according to claim 1, wherein in the cell group rows, the micro cells are connected in parallel, and the adjacent cell group rows are connected in series.

6. The battery module according to claim 1, wherein the number of the negative electrode plates is equal to or greater than the number of the positive electrode plates.

7. The battery module according to claim 6, wherein when the number of the negative electrode sheets is equal to that of the positive electrode sheets, the side of the positive electrode sheet opposite to the separator is coated with a positive electrode carrier film.

8. The battery module as claimed in claim 1, further comprising a bus bar electrically connected to the discharging end and the heating end of the electric core bar.

9. The battery module according to claim 1, wherein the rows of electric cores are externally wrapped with a soft film, and the soft film allows the heating terminals and the discharging terminals of the rows of electric cores to protrude.

10. The battery module according to claim 1, wherein the heating sheet is in a filament shape or a sheet shape.