CN117374471A

CN117374471A - Battery module

Info

Publication number: CN117374471A
Application number: CN202210769123.6A
Authority: CN
Inventors: 詹振江; 罗自皓; 于璐嘉; 孙娅丽; 廖方俊
Original assignee: Zhuhai Cosmx Power Co Ltd
Current assignee: Zhuhai Cosmx Power Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2024-01-09

Abstract

The invention provides a battery module, comprising: the device comprises a battery cell, a metal sheet, a thermoelectric conversion element, a heat conducting sheet and a heating sheet; the metal sheet is positioned at one side of the heat conducting sheet away from the battery cell; the battery cell is respectively contacted with the heating sheet and the heat conducting sheet; the thermoelectric conversion element is in contact with the heat conductive sheet and the metal sheet, respectively. The embodiment of the invention provides a battery module, which converts waste heat of a battery core into electric energy and stores the electric energy in an energy storage device, and converts the electric energy in the energy storage device into heat to be provided for the battery core when the battery is started under a cold condition, so that external heating equipment is prevented from being additionally used, and the effect of saving the use cost of the battery is realized.

Description

Battery module

Technical Field

The invention relates to a lithium battery technology, in particular to a battery module.

Background

Along with the continuous progress of science and technology, more and more electronic products are driven into daily life of people, and many electronic products are developing in wireless direction, and the energy sources of the wireless electronic products come from batteries of the products, and along with the improvement of the performance requirements of the products, the performance requirements of the batteries of the products are also higher and higher. In addition, the demand of wireless electronic devices in some cold regions is gradually increasing, and the discharge performance of the battery is severely limited under cold conditions, even if the electronic device cannot work normally, the battery needs to be heated to enable the electronic product to work normally. In the prior art, the battery is generally heated by external heating equipment, or the heating equipment is additionally arranged in the battery to supply power for heating. However, good heat supply or power supply conditions are required to be ensured outside, and some extremely cold areas, such as examination stations, go out for investigation and the like, cannot ensure that the battery is heated conditionally. And such a heating method causes a problem that the battery heating cost is excessively high.

Disclosure of Invention

The embodiment of the invention provides a battery module, which solves the problem of high heating cost of a battery under a cold condition.

The embodiment of the invention provides a battery module, which comprises: the device comprises a battery cell, a metal sheet, a thermoelectric conversion element, a heat conducting sheet and a heating sheet;

the metal sheet is positioned at one side of the heat conducting sheet away from the battery cell;

the battery cell is respectively contacted with the heating sheet and the heat conducting sheet;

the thermoelectric conversion element is in contact with the heat conductive sheet and the metal sheet, respectively.

Optionally, the battery module comprises a plurality of electric cores which are arranged in parallel;

the heating plate comprises a plurality of heating parts which are arranged side by side along the arrangement direction of the electric cores, a first connecting part for connecting two adjacent heating parts, and a slot arranged on the first connecting part;

the heat conducting sheet comprises a heat conducting part penetrating through the slot, and the heat conducting sheet and the heating sheet form a folding structure;

at least one of the cells is located between the thermally conductive portion and the heating portion.

Optionally, the heat conductive sheet includes a second connection portion connecting adjacent heat conductive portions;

the second connection portion is in contact with the thermoelectric conversion element.

Optionally, in the arrangement direction of the electrical cores, the folding structure includes heat conducting portions respectively located on two opposite sides thereof.

Optionally, the length of the heating part is greater than the length of the heat conducting part, and/or

In the height direction of the battery module, the height of the thermoelectric conversion element is higher than the height of the heat conductive sheet, and/or

The battery cell comprises a shell and a battery cell body, wherein the shell comprises a packaging part for coating the battery cell body and a sealing edge positioned on one side of the packaging part, and the sealing edge is bent towards the direction close to the battery cell body and/or

The battery cell comprises a shell and a battery cell body, wherein the shell comprises a packaging part for coating the battery cell body, and the adjacent packaging parts of the battery cells are oppositely arranged, and/or

The battery module further comprises a buffer member positioned between the battery cell and the heating part, and/or

Is positioned between the battery cell and the heat conducting part.

Optionally, the battery cell includes two first side surfaces disposed opposite to each other and two second side surfaces disposed opposite to each other;

the area of the first side surface is larger than that of the second side surface;

at least one of the first sides of the battery cell is in contact with the heating portion.

Optionally, the battery cell includes a first battery cell located on a first side and a second battery cell located on a second side opposite to the first side;

the two first sides of the first battery core are respectively contacted with the heat conducting part or the heating part, and/or

The two second side surfaces of the second battery cell are respectively contacted with the first connecting part or the second connecting part.

Optionally, an included angle is formed between the heat conducting part and the second connecting part and/or between the heating part and the first connecting part, and the included angle is an arc angle or a linear angle.

Optionally, at least two electric cores are accommodated between the adjacent heat conducting parts or heating parts.

Optionally, the thermoelectric conversion device further comprises a control module and an energy storage module, wherein the control module is connected with the energy storage module and is used for controlling the thermoelectric conversion element to charge the energy storage module or controlling the heating plate to heat the electric core.

Optionally, the thermoelectric conversion device further comprises an amplifying module, wherein the amplifying module is arranged between the thermoelectric module and the energy storage module, and is respectively and electrically connected with the thermoelectric module and the energy storage module, and the amplifying module is used for amplifying the voltage generated by the thermoelectric conversion element and then charging the energy storage module.

The invention provides a battery module, comprising: comprising the following steps: the device comprises a battery cell, a metal sheet, a thermoelectric conversion element, a heat conducting sheet and a heating sheet; the metal sheet is positioned at one side of the heat conducting sheet away from the battery cell; the battery cell is respectively contacted with the heating sheet and the heat conducting sheet; the thermoelectric conversion element is in contact with the heat conductive sheet and the metal sheet, respectively. The embodiment of the invention provides a battery module, which converts waste heat of a battery core into electric energy and stores the electric energy in an energy storage device, and converts the electric energy in the energy storage device into heat to be provided for the battery core when the battery is started under a cold condition, so that external heating equipment is prevented from being additionally used, and the effect of saving the use cost of the battery is realized.

Drawings

FIG. 1 is a schematic diagram of a battery structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a second battery structure according to an embodiment of the invention;

FIG. 3 is a third schematic diagram of a battery according to an embodiment of the invention;

fig. 4 is a schematic structural view of a heat conductive sheet according to an embodiment of the present invention;

FIG. 5 is a schematic view of a heating sheet according to an embodiment of the present invention;

FIG. 6 is a schematic view of a folded structure according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of a battery module according to an embodiment of the present invention;

fig. 8 is a schematic circuit structure of an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. The following embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

Referring to fig. 1-3, fig. 1, 2 and 3 are schematic diagrams of a battery structure in this embodiment, and a battery module provided in this embodiment includes: the battery cell 170, the metal sheet 200, the thermoelectric conversion element 190, the heat conductive sheet 180, and the heating sheet 240;

the metal sheet 200 is located at a side of the heat conducting sheet 180 away from the battery core 170;

the electric core 170 is respectively contacted with the heating sheet 240 and the heat conducting sheet 180;

the thermoelectric conversion element 190 is in contact with the heat conductive sheet 180 and the metal sheet 200, respectively.

In the present embodiment, the heat conductive sheet 180 may be a high heat conductive sheet, the heating sheet 240 may be a heating sheet, and the metal sheet 200 may be an aluminum leakage sheet. A thermoelectric conversion module 190 is arranged between the folded position of the high heat conduction sheet 180 and the outer aluminum leakage sheet 200, and in order to enable the outer aluminum leakage sheet 200 to better receive heat from the electric core 170, heat conduction silicone grease can be added between the outer aluminum leakage sheet 200 and the side edge of the electric core 170 to enhance the heat conduction effect. The electric core 170 is arranged between the high heat conduction sheet and the heating sheet, the temperature of the electric core 170 can be kept or the electric core 170 can be heated according to the temperature provided by the high heat conduction sheet and the heating sheet, the thermoelectric conversion element 190 is used for converting heat between a heat source and a cold source into electric energy and storing the electric energy in a battery, a capacitor and other electric storage devices, after adjustment and control of the control circuit, the electric core can supply power to the heating sheet 240 and the high heat conduction sheet 180 in the battery under the cold condition, the electric core can provide heat, an external power supply is not needed, the battery can reach good discharge temperature under the cold condition, the normal discharge capacity of the battery is ensured, and a stable power supply is provided for equipment operation. If the thermoelectric conversion element 190 is disposed on the front surface of the battery cell 170, only the heat of the battery cell 170 on the outermost side can be absorbed well, and the heat of the battery cell 170 on the inner side is difficult to absorb, and the thickness space of the battery cell 170 is occupied. In addition to the high thermal conductivity sheet 180 and the heating sheet 240, a certain amount of foam 270 is attached between the cells 170 to absorb the thickness expansion of the cells after the cycle. The control module 230 is provided with an energy storage module 220 and an amplifying module 210. The battery further includes a battery upper case 250 and a battery lower case 260, wherein the battery upper case 250 is disposed on the control module 230 and the battery lower case 260 is disposed outside the folded structure. Outside the folded structure are the thermoelectric conversion module 190 and the exposed aluminum sheet 200 in this order.

In another embodiment, referring to fig. 3 to 5, fig. 3 is a schematic structural view of the heat conducting strip in the present embodiment, fig. 4 is a schematic structural view of the heating strip in the present embodiment, and fig. 5 is a schematic structural view of the folded structure in the present embodiment.

the heating plate comprises a plurality of heating parts 243 arranged side by side along the arrangement direction of the electric core, a first connecting part 242 connecting two adjacent heating parts 243, and a slot opened on the first connecting part 242;

the heat conducting fin comprises a heat conducting part 182 penetrating through the slot, and the heat conducting fin and the heating fin form a folding structure;

at least one of the cells is located between the thermally conductive portion 182 and the heating portion 243.

In the present embodiment, the heating sheet is a heating sheet 240, the heat conductive sheet is a high heat conductive sheet 180, and the heating sheet includes a plurality of heating portions 243 and first connecting portions 242, and further includes grooves 241 on the first connecting portions 242; the high heat conductive sheet 180 and the heating sheet 240 form a matched folding structure through the slots 241, and optionally, at least two electric cores are accommodated between the adjacent heat conductive parts 182 or the heating parts 243. Depending on the structure formed by the heat conducting portion 182 or the heating portion 243, one or more cells are disposed in the folded structure.

Optionally, the heat conductive sheet includes a second connection portion 181 connecting adjacent heat conductive portions 182; the second connection portion 181 is in contact with the thermoelectric conversion element.

Optionally, in the arrangement direction of the electrical cores, the folded structure includes heat conducting portions 182 respectively located on opposite sides thereof. The length of the heating portion 243 is greater than the length of the heat conducting portion 182, and/or in the height direction of the battery module, the height of the thermoelectric conversion element is greater than the height of the heat conducting sheet, and/or the battery cell includes a housing and a battery cell body, the housing includes a package portion covering the battery cell body and a seal edge located at one side of the package portion, the seal edge is bent in a direction close to the battery cell body, and/or the battery cell includes a housing and a battery cell body, the housing includes a package portion covering the battery cell body, the adjacent package portions of the battery cells are disposed in opposite directions, and/or the battery module further includes a buffer member located between the battery cell and the heating portion 243, and/or between the battery cell and the heat conducting portion 182.

In this embodiment, the high heat conduction sheet 180 and the heating sheet 240 form a folding structure, and the two form a composite folding structure together, each electric core is respectively placed between adjacent folding surfaces of the composite folding structure, the folding position of the heating sheet 240 is slotted and kept away for assembling with the high heat conduction sheet 180, the folding position needs to ensure that the high heat conduction sheet 180 is located at the outer side, and the heating sheet 240 is located at the inner side so as to ensure that the high heat conduction sheet 180 is better contacted with the thermoelectric conversion device located at the outer side. The composite folding structure can make each electric core have at least one large surface in contact with the heating sheet, so that each electric core is heated more uniformly, and the temperature difference between the electric cores is further balanced due to the high heat conduction characteristic of the high heat conduction sheet 180, so that the temperature of each electric core is nearly consistent when the battery works, and the service life of the battery is prolonged. Further, the heating sheet 240 may also be connected to a control module through a wire, so that the control module can control the operation of the heating sheet.

at least one of the first sides of the cells is in contact with the heating portion 243.

the two first sides of the first cell are respectively contacted with the heat conducting part 182 or the heating part 243, and/or

The two second sides of the second battery cell are respectively contacted with the first connection part 242 or the second connection part 181.

Optionally, an included angle is formed between the heat conducting portion 182 and the second connecting portion 181 and/or between the heating portion 243 and the first connecting portion 242, and the included angle is an arc angle or a linear angle.

In this embodiment, the battery cell is in a long body shape and is disposed in the adjacent heat conducting portion 182, the first side surface of the battery cell is a surface with a larger area, and the second side surface is a surface with a smaller area, and by contacting the surface with a larger area with the heat conducting portion 182, the battery cell can be heated better. Two or more electric cores are accommodated between the adjacent heat conducting parts 182, and the specific number is adaptively adjusted according to the actual situation. The included angle between the heat conducting portion 182 and the second connecting portion 181 is generally required to be smaller than 90 °, and when the included angle is larger than 90 °, the battery cell cannot be completely contacted with the heat conducting portion 182, so that the problem of uneven heating occurs

Referring to fig. 7, fig. 7 is a schematic block diagram of a battery module according to an embodiment of the present invention, specifically, a battery module, including: the thermoelectric module 1, the battery core 2, the energy storage module 3 and the heating module 4;

the thermoelectric module 1 is electrically connected with the energy storage module 3, the energy storage module 3 is electrically connected with the heating module 4, and the heating module 4 and the thermoelectric module 1 are in contact with the electric core 2;

the thermoelectric module 1 is used for generating a first voltage according to the temperature difference between the cold end of the thermoelectric module 1 and the surface of the battery core 2;

the energy storage module 3 is configured to perform charging according to the first voltage, and in a case where a preset condition is satisfied, the energy storage module 3 releases a second voltage generated according to the first voltage;

the heating module 4 is configured to convert the second voltage into first heat and provide the first heat to the battery cell 2.

In this embodiment, the thermoelectric module 1 uses the thermoelectric conversion technology of the seebeck effect, and the thermoelectric conversion device is arranged at the side edge of the electric core 2, and the thermoelectric conversion device comprises a plurality of groups of thermoelectric conversion units, so that after the heat energy generated in the operation of the battery is converted into electric energy, the electric energy is stored in the electric storage devices such as the battery and the capacitor after the voltage is amplified by the control circuit and the charging and discharging processes are controlled, the heating problem of the battery is effectively solved, the temperature of key components such as the electric core 2 is reduced, the working performance and the service life of the battery are improved, and the user experience is improved.

Specifically, alternatively, the thermoelectric module 1 includes a heat source, a thermoelectric conversion module, and a cold source, the thermoelectric conversion module being disposed between the heat source and the cold source, the thermoelectric conversion module being in contact with the heat source and the cold source, respectively; the heat source is an electric core 2, heat from the heat source is led out by the high heat conduction sheet and then is absorbed by the thermoelectric conversion module to be converted into electric energy, and the thermoelectric conversion module is contacted with the aluminum sheet and then is sequentially arranged on the surface of the high heat conduction sheet.

The waste heat in the running process of the battery core 2 is used as a heat source, an external aluminum leakage sheet arranged on the outer shell is used as a cold source, heating can be performed under the condition of temperature difference, and the heating effect is better when the battery is in a cold condition. The first voltage is generated by the temperature difference between the heat source and the cold source and the thermoelectric conversion module, and it should be noted that the first voltage is generally lower than the charging voltage of the energy storage module 3, and the first voltage needs to be amplified by the amplifying unit before the first voltage is higher than the charging voltage of the energy storage module 3.

In another embodiment, referring to fig. 8, fig. 8 is a schematic circuit diagram of the present embodiment, wherein a thermoelectric conversion module 110 is disposed between a heat source 100 and a cold source 120, and the heat source 100, the cold source 120 and the thermoelectric conversion module 110 are combined into a thermoelectric module. Optionally, the power amplifier further includes an amplifying module 130, where the amplifying module 130 is disposed between the thermoelectric module and the energy storage module 140 and is electrically connected to the thermoelectric module and the energy storage module 140, and the amplifying module 130 is configured to amplify the first voltage and then charge the energy storage module 140. Optionally, a control module 150 is further included, where the control module 150 is electrically connected to the energy storage module 140, and the control module 150 is used to control the charging and discharging process of the energy storage module 140. Optionally, the control module 150 is a circuit board, and the amplifying module 130 and the energy storage module 140 are both disposed on the circuit board.

Wherein a thermoelectric conversion module 110 is disposed between the heat source 100 and the cold source 120, wherein the thermoelectric conversion module 110 includes a plurality of groups of thermoelectric conversion units for generating a first voltage. The thermoelectric conversion module 110 and the amplifying module 130, and the energy storage module 140 form a loop. The energy storage module 140 is in circuit with the control module 150 and the heating foil 160 in the heating module. Specifically, the amplifying module 130 may use an electronic component with a circuit amplifying function, so that the potential difference generated by the thermoelectric conversion module 110 is amplified, and the voltage value of the electric energy stored in the energy storage module 140 is illustratively used as an operational amplifier in the present embodiment, and other circuit amplifying devices may be selected. The energy storage module 140 may select various devices with an energy storage capability, such as a capacitor or a special low-temperature battery, etc., and may be adaptively selected according to practical situations, which is not specifically limited in this embodiment. The control module 150 can control the charge and discharge process of the energy storage module 140, and release, adjust and match the electric power stored in the energy storage module 140 to supply power to the heating sheet 160 when the battery core needs to be heated, and also has a circuit protection function.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A battery module, comprising: the device comprises a battery cell, a metal sheet, a thermoelectric conversion element, a heat conducting sheet and a heating sheet;

2. The battery module according to claim 1, wherein the battery module comprises a plurality of cells arranged in parallel;

3. The battery module according to claim 2, wherein the heat conductive sheet includes a second connection part connecting adjacent heat conductive parts;

4. The battery module according to claim 2, wherein the battery module comprises,

in the arrangement direction of the battery cells, the folding structure comprises heat conducting parts respectively positioned on two opposite sides of the folding structure.

5. The battery module according to claim 2, wherein the length of the heating part is greater than the length of the heat conduction part, and/or

Is positioned between the battery cell and the heat conducting part.

6. The battery module according to claim 3, wherein the battery cell includes two first side surfaces disposed opposite to each other and two second side surfaces disposed opposite to each other;

7. The battery module of claim 6, wherein the cells include a first cell on a first side and a second cell on a second side opposite the first side;

8. The battery module according to claim 3, wherein an included angle is formed between the heat conduction part and the second connection part and/or between the heating part and the first connection part, and the included angle is an arc angle or a linear angle.

9. The battery module according to claim 4, wherein at least two cells are accommodated between adjacent heat conducting portions or heating portions.

10. The battery module according to claim 1, further comprising a control module and an energy storage module, wherein the control module is connected to the energy storage module, and the control module is configured to control the thermoelectric conversion element to charge the energy storage module or control the heating sheet to heat the electric core.

11. The battery module according to claim 10, further comprising an amplifying module disposed between the thermoelectric module and the energy storage module and electrically connected to the thermoelectric module and the energy storage module, respectively, wherein the amplifying module is configured to amplify the voltage generated by the thermoelectric conversion element and then charge the energy storage module.