CN113904028A - Battery module, battery package and consumer - Google Patents

Battery module, battery package and consumer Download PDF

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Publication number
CN113904028A
CN113904028A CN202111151877.7A CN202111151877A CN113904028A CN 113904028 A CN113904028 A CN 113904028A CN 202111151877 A CN202111151877 A CN 202111151877A CN 113904028 A CN113904028 A CN 113904028A
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heatable
battery
module
cell
temperature
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CN202111151877.7A
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CN113904028B (en
Inventor
柯长轩
王慧鑫
汪颖
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp Technology Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The embodiment of the invention relates to the technical field of lithium ion batteries, and particularly discloses a battery module, a battery pack and electric equipment, which comprise: the module comprises a module shell and an electric core assembly, wherein the electric core assembly is arranged in the module shell and comprises a plurality of heatable electric cores stacked along a first direction, the plurality of heatable electric cores are electrically connected, each heatable electric core comprises an electrode assembly, the module shell, a first electrode lug, a second electrode lug, a heating sheet and a switch module, the electrode assembly is contained in the module shell, one end of the first electrode lug and one end of the second electrode lug are respectively and electrically connected with the electrode assembly, the heating sheet is arranged in the module shell, one end of the heating sheet is connected with the first electrode lug, and the switch module is connected between the heating sheet and the second electrode lug; the resistance value of the heating sheet of the heatable battery cell is gradually increased along the first direction from the middle heatable battery cell and along the opposite direction to the first direction from the middle heatable battery cell. Through the manner, the embodiment of the invention realizes the accurate heating of each lithium ion battery cell.

Description

Battery module, battery package and consumer
Technical Field
The embodiment of the invention relates to the technical field of lithium ion batteries, in particular to a battery module, a battery pack and electric equipment.
Background
In the existing market, a common lithium ion battery module comprises a single lithium ion battery cell, the electric quantity of the single lithium ion battery cell is less, in order to increase the electric quantity, a plurality of lithium ion battery cells are usually wrapped to form a new lithium ion battery module, and the problem of less electric quantity can be solved by the new lithium ion battery module. Among them, a single lithium ion cell generally consists of a positive electrode, a negative electrode, a separator, an electrolyte, and the like. When a single lithium ion battery cell works, internal lithium ions move between the positive electrode and the negative electrode by taking the electrolyte as a carrier, so that the charge and discharge of the battery cell are realized. When the temperature is low, the migration rate of lithium ions becomes slow, resulting in a large amount of lithium precipitation at the time of charging or a large capacity loss at the time of discharging. In order to ensure the service life of the battery, the service temperature of the battery is generally limited. At present, the charging temperature of the lithium ion battery is limited to 0 ℃ to 60 ℃, and the discharging temperature is limited to-20 ℃ to 60 ℃. In order to realize normal charging and discharging of the lithium ion battery module at low temperature, an independent external heating device is usually provided to heat the lithium ion battery cell inside the lithium ion battery module.
In the process of implementing the invention, the inventor of the invention finds that: the external heating device can only evenly heat each lithium ion battery cell, the lithium ion battery cells after being heated are easy to present the phenomenon that the temperature is high and inconsistent, the temperature of the middle battery cell is high, and the phenomenon that the temperature of the battery cell at the two ends of the middle battery cell is low is often existed, so that the charging and discharging efficiency of each lithium ion battery cell is different, the charging capacitance and the discharging capacitance of the lithium ion battery module are influenced, and great inconvenience is brought to users.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a battery module, a battery pack, and an electric device, which overcome the problems that the heated lithium ion battery cells are prone to have inconsistent temperature, and the temperature of the middle battery cell is often high, and the temperature of the battery cells far away from the two ends of the middle battery cell is often low, so that the charging and discharging efficiency of each lithium ion battery cell is different, and the charging and discharging capacities of the lithium ion battery module are affected.
According to an aspect of an embodiment of the present invention, there is provided a battery module including: the module comprises a module shell and a cell assembly, wherein the module shell is provided with a cell cavity, the cell assembly is accommodated in the cell cavity and comprises a plurality of heatable cells which are stacked, the plurality of heatable cells are electrically connected, the heatable cells comprise an electrode assembly, a module shell, a first lug, a second lug, a heating sheet and a switch module, the electrode assembly is accommodated in the module shell, one end of the first lug and one end of the second lug are respectively and electrically connected with the electrode assembly, the other end of the first lug and the other end of the second lug extend out of the module shell, the heating sheet is arranged in the module shell, one end of the heating sheet is connected with the first lug, the switch module is arranged in the module shell, one end of the switch module is connected with the other end of the heating sheet, and the other end of the switch module is connected with the second lug, along the first direction, the middle heatable battery cell is located in the middle of the battery module, and the second direction is perpendicular to the first direction; the resistance value of the heating sheet of the heatable battery cell is gradually increased along the first direction from the middle heatable battery cell, and along the direction opposite to the first direction from the middle heatable battery cell.
In an optional mode, the resistance value R of the heating sheet ranges from 0.5 omega to 10 omega.
In an alternative mode, the resistance values of the heating sheets of the heatable cells increase in an equal difference from the middle heatable cell in the first direction and from the middle heatable cell in the opposite direction to the first direction.
In an optional manner, the number n of the heatable cells is an odd number, and the resistance value of the heating sheet of the heatable cell satisfies the following formula:
Figure BDA0003287445580000021
wherein, R is1Is the resistance value of the heating sheet of the middle heatable battery cell, n is an odd number, the
Figure BDA0003287445580000022
In a first direction from the intermediate heatable cell and in the opposite direction from the intermediate heatable cell, a second direction
Figure BDA0003287445580000023
Resistance of each heatable battery cell.
In an optional manner, the number of the heatable cells is even, and the resistance value of the heating sheet of the heatable cell satisfies the following formula:
Figure BDA0003287445580000031
wherein, R is1The resistance value of the heating sheet of the middle heatable battery cell is n is even number, the resistance value of the heating sheet of the middle heatable battery cell is smaller than n
Figure BDA0003287445580000032
In a first direction from the intermediate heatable cell and in the opposite direction from the first direction from the intermediate heatable cell
Figure BDA0003287445580000033
Resistance of each heatable battery cell.
In an optional mode, the battery module includes temperature-detecting device and controller, temperature-detecting device set up in electricity core subassembly, temperature-detecting device is used for detecting the temperature of electricity core subassembly, the controller electricity respectively with switch module and temperature-detecting device connect, the controller is used for detecting at temperature-detecting device when the temperature of electricity core subassembly is less than first predetermined temperature, the controller control switch module is closed, the heating member heats, and, temperature-detecting device detects when the temperature of electricity core subassembly is higher than the second predetermined temperature, the controller control switch module disconnection, the heating member stops heating.
In an optional mode, the battery module includes a heat conducting assembly, the heat conducting assembly is disposed in the battery cavity, and the heat conducting assembly connects the plurality of heatable electric cores.
In an optional mode, the heat conducting assembly includes a heat conducting bottom plate and a plurality of heat conducting vertical plates, the plurality of heat conducting vertical plates are fixed to the heat conducting bottom plate, and the plurality of heat conducting vertical plates are arranged at intervals, the heatable electric core is arranged between two adjacent heat conducting vertical plates, and the heatable electric core is respectively in contact with the heat conducting vertical plates and the heat conducting bottom plate.
In an optional mode, the heat conducting component is made of silica gel, silicone grease, a copper sheet or an aluminum sheet.
According to another aspect of the embodiments of the present invention, there is provided a battery pack including: at least two battery modules as described above, at least two of the battery modules being connected in parallel/series with each other in a third direction, the third direction being perpendicular to the first and second directions.
According to another aspect of the embodiments of the present invention, there is provided an electric device including the battery pack as described above.
The embodiment of the invention has the beneficial effects that: different from the prior art, the embodiment of the invention is provided with a module shell and an electric core assembly, the module shell is provided with a battery cavity, the electric core assembly is accommodated in the battery cavity, wherein the electric core assembly comprises a plurality of heatable electric cores stacked along a first direction, the plurality of heatable electric cores are electrically connected, each heatable electric core comprises an electrode assembly, a module shell, a first tab, a second tab, a heating sheet and a switch module, the electrode assembly is accommodated in the module shell, one end of the first tab and one end of the second tab are respectively electrically connected with the electrode assembly, the other end of the first tab and the other end of the second tab both extend out of the module shell along a second direction, the heating sheet is arranged in the module shell, one end of the heating sheet is connected with the first tab, and the switch module is arranged on the module shell, one end of the switch module is connected with the other end of the heating sheet, the other end of the switch module is connected with the second pole lug, the middle heatable battery core is located in the middle of the battery module along the first direction, and the second direction is perpendicular to the first direction. Furthermore, the resistance value of the heating sheet of the heatable cell increases gradually from the central heatable cell in the first direction and from the central heatable cell in the opposite direction to the first direction. The arrangement is that along with the increase of the resistance value of the heating sheet of the heatable battery core, the heat generated by the heating sheet is gradually increased, so that the temperature of the middle heatable battery core is approximately the same as or has smaller difference with the temperature of the heatable battery core far away from the middle heatable battery core, the charging and discharging efficiency of each heatable battery core is further basically consistent, and accurate heating of each battery core is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is an exploded view illustrating the overall structure of a battery module according to an embodiment of the present invention;
fig. 2 is an exploded view illustrating the overall structure of one embodiment of a battery module according to the present invention;
fig. 3 is an exploded view illustrating a partial structure of one embodiment of a battery module according to the present invention;
fig. 4 is a schematic diagram of an internal circuit of a heatable cell of a battery module according to an embodiment of the present invention;
fig. 5 is a partial structural plan view of an embodiment of a battery module according to the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For better explanation of the structure of the battery module 01, the structure of the battery module 01 will be described in connection with X, Y, Z coordinate axes, where X, Y, Z coordinate axes are perpendicular two by two, the first direction is along the positive direction of the X axis, the second direction is along the positive direction of the Y axis, and the third direction is along the positive direction of the Z axis.
Referring to fig. 1, a battery module 01 includes a module case 10, a cell assembly 20, a temperature detecting device (not shown), and a controller (not shown). The electricity core subassembly 20 set up in the module casing 10, temperature-detecting device set up in electricity core subassembly 20, temperature-detecting device is used for detecting the temperature of electricity core subassembly 20, the controller with electricity core subassembly 20, temperature-detecting device are connected.
In some embodiments, as shown in fig. 2, the battery module 01 further includes a heat conducting assembly 30, the heat conducting assembly 30 is disposed in the module housing 10, and the heat conducting assembly 30 is connected to the electric core assembly 20.
For the above module housing 10, as shown in fig. 2, the module housing 10 includes a housing body 101 and a cover plate 102, the housing body 101 is provided with a battery cavity 10a and an opening 10b communicated with the battery cavity 10a, the cover plate 102 is disposed at the opening 10b, the opening 10b is convenient for installing the battery assembly 20 in the battery cavity 10a, the battery assembly 20 is accommodated in the battery cavity 10a, the battery cavity 10a is used for accommodating the battery assembly 20 and other internal components of the battery module 01, the module housing 10 can reduce external dust entering the battery module 01, and meanwhile, damage caused by direct contact between the internal components of the battery module 01 and the external components is reduced.
For the above-mentioned battery pack assembly 20, as shown in fig. 1-2, the battery pack assembly 20 includes a plurality of heatable battery cores 22 stacked, and the heatable battery cores 22 are electrically connected, so that when the temperature of the working environment of the battery module 01 is low and the charging and discharging of the battery cores are influenced, the heatable battery cores 22 are utilized to generate heat, thereby increasing the temperature of the working environment of the battery cores inside the battery module 01, and the battery module 01 is normally charged and discharged.
Specifically, as shown in fig. 4 and fig. 5, the heatable battery cell 22 includes an electrode assembly 221, a cell casing (not shown), a first tab 223, a second tab 224, a heating plate 225, and a switch module 226, where the electrode assembly 221 is accommodated in the cell casing, one end of the first tab 223 and one end of the second tab 224 are respectively electrically connected to the electrode assembly 221, the other end of the first tab 223 and the other end of the second tab 224 both extend out of the cell casing, the heating plate 225 is disposed in the cell casing, one end of the heating plate 225 is connected to the first tab 223 of the battery cell, the switch module 226 is disposed in the cell casing, one end of the switch module 226 is connected to the other end of the heating plate 225, and the other end of the switch module 226 is connected to the second tab 224. When the switch module 226 is in a connected state, the heating plate 225, the first tab 223 and the second tab 224 are electrically connected, and the heating plate 225 is in a heating state; when the switch module 226 is in the off state, the electrical connection among the heating plate 225, the first tab 223 and the second tab 224 is in the off state, and the heating plate 225 is in the heating stop state.
In some embodiments, the resistance of the heating sheet of the heatable cell 22 increases gradually from the middle heatable cell in the first direction and from the middle heatable cell in the opposite direction to the first direction, that is, from the middle heatable cell 22 to the heatable cells 22 at the two ends, and the heat generated by the heating sheet increases gradually as the resistance of the heating sheet of the heatable cell 22 increases, so as to ensure that the middle cell temperature is substantially the same as or slightly different from the cell temperatures at the two ends away from the middle cell. Optionally, the resistance value R of the heating sheet is within a range of 0.5 Ω -10 Ω.
In some embodiments, the resistance of the heater sheets of the heatable cells 22 increases in an equal difference from the central heatable cell in the first direction and from the central heatable cell in the opposite direction from the first direction. For example: when the number n of the heatable battery cells 22 is an odd number, the resistance value of the heating sheet of the heatable battery cell 22 satisfies the following formula:
Figure BDA0003287445580000071
wherein, R is1Is the resistance value of the heating sheet of the middle heatable battery cell, n is an odd number, the
Figure BDA0003287445580000072
In a first direction from the intermediate heatable cell and in a direction opposite to the first direction from the intermediate heatable cell
Figure BDA0003287445580000073
The resistance of each heatable cell 22; when the number of the heating cells is even, the resistance value of the heating sheet of the heatable cell 22 is fullThe following formula holds:
Figure BDA0003287445580000074
wherein, R is1The resistance value of the heating sheet of the middle heatable battery cell is n is even number, the resistance value of the heating sheet of the middle heatable battery cell is smaller than n
Figure BDA0003287445580000075
In a first direction from the intermediate heatable cell and in a direction opposite to the first direction from the intermediate heatable cell
Figure BDA0003287445580000076
The resistance of each heatable cell 22.
It should be noted that: the "intermediate" heatable cells 22 are defined according to the parity of the number of heatable cells 22, for example: when the number of the heatable cells 22 is odd, the number of the "middle" heatable cells 22 is one, and the other heatable cells 22 are arranged oppositely with the "middle" heatable cells 22 as a "symmetry axis"; when the number of heatable cells 22 is even, the number of "middle" heatable cells 22 is two, and similarly, the remaining heatable cells 22 are disposed opposite to each other with "middle" heatable cells 22 as a "symmetry axis".
In some embodiments, as shown in fig. 2, the heat conducting assembly 30 includes a heat conducting bottom plate 301 and a plurality of heat conducting risers 302, the plurality of heat conducting risers 302 are fixed to the heat conducting bottom plate 301, and the plurality of heat conducting risers 302 are disposed at intervals, a cell is disposed between two adjacent heat conducting risers 302, and the heatable cell 22 is in contact with the heat conducting risers 302 and the heat conducting bottom plate 301 respectively. The heat conducting bottom plate 301 transfers heat to the bottom of the battery cell, and the plurality of heat conducting vertical plates 302 transfer heat to the side of the heatable battery cell 22, so that the heatable battery cell 22 is uniformly heated at all positions. Optionally, the heat conducting assembly 30 is silica gel, and the heat conducting assembly is formed by curing liquid silica gel. It is understood that the material for making the heat conducting component is not limited to silicon gel, but may be other materials, such as: silicone grease, copper sheet or aluminum sheet.
To above-mentioned temperature-detecting device and controller, temperature-detecting device set up in electricity core subassembly 20, temperature-detecting device is used for detecting electricity core subassembly 20's temperature, the controller respectively with switch module 226 is connected with temperature-detecting device, the controller is used for detecting at temperature-detecting device electricity core subassembly 20's temperature is less than when first temperature of predetermineeing, controller control switch module 226 is closed, heating plate 225 heats, and temperature-detecting device detects electricity core subassembly 20's temperature is higher than when the second temperature of predetermineeing, controller control switch module 226 disconnection, heating plate 225 stops to heat. It is understood that the values of the first preset temperature and the second preset temperature can be set according to actual situations, for example: the first temperature of predetermineeing can set up to 0 ℃ when temperature detection device detects the temperature of electric core subassembly 20 and is less than 0 ℃, controller control switch module 226 is closed, thereby the heating plate 225 heats, and through heat conduction assembly 30 will heat transfer that heating plate 225 produced gives other electricity cores, the second temperature of predetermineeing can set up to 40 ℃ temperature detection device detects when the temperature of electric core subassembly 20 is higher than 40 ℃, controller control switch module 226 breaks off, heating plate 225 stops the heating.
In addition, for the convenience of the reader to understand the effect that the heating sheet of the heatable battery cell is arranged inside the heatable battery cell in the embodiment of the present invention, the following comparative calculation description is performed, and the calculation process is as follows:
comparative example 1: utilize electric bicycle national standard 4812's internal battery module (electric core capacity is 12AH), the quantity of its inside heatable electric core is 13, and the heating plate of heatable electric core sets up in the outside of heatable electric core, and the resistance of single heatable electric core sets for R, detects when temperature-detecting device the temperature of electric core subassembly is below 0 ℃, but controller control heating of heating electric core, and the electric current of setting for flowing through the external heating plate is I, and then the heat production total amount of single electric core is for IQ＝I2Rt+QlossAnd Q isloss>0, wherein QlossIs the heat lost during heat transfer.
Example 1: utilize electric bicycle national standard 4812's internal battery module (electric core capacity is 12AH), the quantity of its inside heatable electric core is 13, and the heating plate of heatable electric core sets up in the inside of heatable electric core, and the resistance of single heatable electric core sets for R, detects when temperature-detecting device the temperature of electric core subassembly is below 0 ℃, but controller control heating of heatable electric core, and the electric current of setting for flowing through the internal heating plate is I, and then the heat production total amount of single electric core is Q ═ I2Rt-QlossSince the heating sheet is positioned inside the heatable electric core, the heat generated by the heating sheet is directly supplied to the electric core for heating, therefore, Qloss＝0，QlossIs the heat lost during heat transfer.
As can be seen from the above, when the two cells are set to reach the same temperature a under the same conditions, the time required for heating the heatable cell to reach the temperature a in example 1 is shorter than the time required for heating the heatable cell to reach the temperature a in comparative example 1, that is, the heat loss of the heatable cell in example 1 is small.
In the embodiment of the present invention, by providing a module housing and an electric core assembly 20, the module housing is provided with a battery cavity 10a, the electric core assembly 20 is accommodated in the battery cavity 10a, wherein the electric core assembly 20 comprises a plurality of heatable electric cores 22 stacked and arranged, the plurality of heatable electric cores 22 are electrically connected, the heatable electric core 22 comprises an electrode assembly 221, a module housing, a first tab 223, a second tab 224, a heating plate 225 and a switch module 226, the electrode assembly 221 is accommodated in the module housing, one end of the first tab 223 and one end of the second tab 224 are respectively electrically connected to the electrode assembly 221, the other end of the first tab 223 and the other end of the second tab 224 both protrude from the module housing, the heating plate 225 is arranged in the module housing, one end of the heating plate 225 is connected to the first tab 223, the switch module 226 is disposed in the module housing, one end of the switch module 226 is connected to the other end of the heating plate 225, the other end of the switch module 226 is connected to the second tab 224, along the first direction, the middle heatable electric core is located in the middle of the battery module, and the second direction is perpendicular to the first direction. In addition, the resistance value of the heating sheet 225 of the heatable battery cell 22 is gradually increased along the first direction from the middle heatable battery cell and along the direction opposite to the first direction from the middle heatable battery cell, so that the heat generated by the heating sheet 225 is gradually increased along with the increase of the resistance value of the heating sheet 225 of the heatable battery cell 22, and therefore the temperature of the middle battery cell is substantially the same as or has a small difference with the temperature of the battery cell far away from the two ends of the middle battery cell, the charging and discharging efficiency of each battery cell is further substantially consistent, and accurate heating of each battery cell is achieved.
The invention further provides an embodiment of a battery pack, the battery pack includes at least two battery modules 01 as described above, at least two battery modules are connected in parallel/in series in a third direction, and the functions and structures of the battery modules 01 may refer to the above embodiment, which is not described in detail herein.
The invention also provides an embodiment of an electric device, the electric device comprises the battery pack, and the functions and the structure of the battery pack can refer to the embodiment, which is not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A battery module comprises a module shell and a battery core assembly, wherein the module shell is provided with a battery cavity, the battery core assembly is accommodated in the battery cavity, and the battery module is characterized in that,
the electric core assembly comprises a plurality of heatable electric cores stacked along a first direction, the plurality of heatable electric cores are electrically connected, each heatable electric core comprises an electrode assembly, a module shell, a first tab, a second tab, a heating sheet and a switch module, the electrode assembly is accommodated in the module shell, one end of the first tab and one end of the second tab are respectively electrically connected with the electrode assembly, the other end of the first tab and the other end of the second tab both extend out of the module shell along a second direction, the heating sheet is arranged in the module shell, one end of the heating sheet is connected with the first tab, the switch module is arranged on the module shell, one end of the switch module is connected with the other end of the heating sheet, the other end of the switch module is connected with the second tab, and the middle heatable electric core is positioned in the middle position of the battery module along the first direction, the second direction is perpendicular to the first direction;
the resistance value of the heating sheet of the heatable battery cell is gradually increased along the first direction from the middle heatable battery cell, and along the direction opposite to the first direction from the middle heatable battery cell.
2. The battery module as set forth in claim 1, wherein the resistance R of the heating sheet ranges from 0.5 Ω R10 Ω.
3. The battery module according to claim 1,
and the resistance value of the heating sheet of the heatable battery cell is increased in an equal difference mode along the first direction from the middle heatable battery cell and along the direction opposite to the first direction from the middle heatable battery cell.
4. The battery module according to claim 3, wherein the number n of the heatable cells is an odd number, and the resistance value of the heating sheet of the heatable cell satisfies the following formula:
R1＝0.5Ω，
Figure FDA0003287445570000011
wherein, R is1Is the resistance value of the heating sheet of the middle heatable battery cell, n is an odd number, the
Figure FDA0003287445570000021
In a first direction from the intermediate heatable cell and in a direction opposite to the first direction from the intermediate heatable cell
Figure FDA0003287445570000022
The resistance value of each heatable battery cell.
5. The battery module according to claim 3,
the number of the heatable battery cores is even, and the resistance value of the heating sheet of the heatable battery core meets the following formula:
R1＝0.5Ω，
Figure FDA0003287445570000023
wherein, R is1The resistance value of the heating sheet of the middle heatable battery cell is n is even number, the resistance value of the heating sheet of the middle heatable battery cell is smaller than n
Figure FDA0003287445570000024
In a first direction from the intermediate heatable cell and in a direction opposite to the first direction from the intermediate heatable cell
Figure FDA0003287445570000025
The resistance value of each heatable battery cell.
6. The battery module according to claim 1,
the battery module includes temperature-detecting device and controller, temperature-detecting device set up in on the electricity core subassembly, temperature-detecting device is used for detecting the temperature of electricity core subassembly, the controller electricity respectively with switch module and temperature-detecting device connect, detect at temperature-detecting device the temperature of electricity core subassembly is less than when first temperature of predetermineeing, the controller control switch module is closed, add the heating member heating, and temperature-detecting device detects when the temperature of electricity core subassembly is higher than the second temperature of predetermineeing, the controller control switch module disconnection, add the heating member stop heating.
7. The battery module according to claim 1,
the battery module comprises a heat conduction assembly, the heat conduction assembly is arranged in the battery cavity, and the heat conduction assembly is connected with the plurality of heatable battery cores.
8. The battery module according to claim 7, wherein the heat conducting member is made of silicon gel, silicone grease, a copper sheet or an aluminum sheet.
9. A battery pack comprising at least two battery modules according to any one of claims 1 to 7, at least two of the battery modules being connected in parallel/series with each other in a third direction, the third direction being perpendicular to the first and second directions.
10. An electric device comprising the battery pack according to any one of claims 9.
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