CN113363684B - Battery pack and electric equipment - Google Patents

Battery pack and electric equipment Download PDF

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Publication number
CN113363684B
CN113363684B CN202110601073.6A CN202110601073A CN113363684B CN 113363684 B CN113363684 B CN 113363684B CN 202110601073 A CN202110601073 A CN 202110601073A CN 113363684 B CN113363684 B CN 113363684B
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China
Prior art keywords
cutting part
battery
cutting
tab
battery pack
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CN202110601073.6A
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Chinese (zh)
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CN113363684A (en
Inventor
黄思林
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp Technology Ltd
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Priority to CN202110601073.6A priority Critical patent/CN113363684B/en
Publication of CN113363684A publication Critical patent/CN113363684A/en
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Publication of CN113363684B publication Critical patent/CN113363684B/en
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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/581—Devices or arrangements for the interruption of current in response to 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
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The application discloses group battery and consumer can reduce and overcharge the probability that leads to battery thermal runaway. The battery pack comprises a battery cell and a connecting sheet, the battery cell comprises a pole lug, the connecting sheet is connected with the pole lug, the connecting sheet comprises a cutting part and a first insulating layer, and the end part of the cutting part faces the pole lug; the first insulation layer is arranged on the surface of the cutting part, at least part of the first insulation layer is located between the pole lug and the cutting part, and the first insulation layer melts when the temperature is higher than a first threshold value.

Description

Battery pack and electric equipment
Technical Field
The application relates to the field of battery connection, concretely relates to group battery and consumer.
Background
When the battery is charged and then charged after reaching a full charge state, the internal pressure of the battery may increase, the battery may deform, and the battery may leak, and the performance of the battery may be significantly degraded. When the battery is connected to the external circuit, the external circuit is also affected, which results in the damage of the external circuit.
There is a need to provide a technique for preventing the influence of the battery on the external circuit during overcharge.
Disclosure of Invention
In view of this, the present application provides a battery pack and an electric device, which can reduce the influence of the battery on the external circuit during overcharging.
The application provides a battery pack, which comprises a battery cell and a connecting sheet, wherein the battery cell comprises a pole lug, the connecting sheet is connected with the pole lug, the connecting sheet comprises a cutting part and a first insulating layer, and the end part of the cutting part faces the pole lug; the first insulation layer is arranged on the surface of the cutting part, at least part of the first insulation layer is located between the pole lug and the cutting part, and the first insulation layer melts when the temperature is higher than a first threshold value.
When the peripheral temperature of the first insulation layer does not reach the first threshold value, the first insulation layer can reduce the phenomenon that the electrode lug is cut off by the metal surface of the connecting sheet in the stretching process. The first insulating layer melts when the temperature is higher than a first threshold value, the tab can move towards the end of the cutting portion along with the expanded battery cell, when the tab moves to be connected with the cutting portion, the cutting portion can break off a loop of the battery cell, and safety failure is reduced.
Optionally, the first insulating layer includes an adhesive layer, and a melting point of the adhesive layer is less than or equal to the first threshold.
Optionally, the setting range of the first threshold is greater than or equal to 60 degrees celsius and less than or equal to 120 degrees celsius.
Optionally, the thickness of the adhesive layer ranges from 0.05 mm to 3 mm.
Optionally, the edge of the cutting portion is provided with a cutting structure, and the cutting structure includes at least one of a sawtooth, a peak, a beveled edge, and a sharp edge.
Optionally, the connecting piece includes at least one of a copper connecting piece, an aluminum connecting piece, and a steel connecting piece.
Optionally, the battery pack further includes a PCB, the connecting portion is disposed on the PCB, and the cutting portion is located outside the PCB.
Optionally, the distance between the cutting part and the PCB is 0.1-4 mm.
Optionally, the maximum thickness of the thinnest part of the cutting part is 0.01-0.03 mm.
The application provides a piece of electric equipment, electric equipment includes the group battery.
The battery pack and the electric equipment in the application realize connection of the battery and the external circuit through the connecting sheet with the cutting part, the cutting part is provided with the first insulating layer, and the first insulating layer can be melted when the temperature is higher than a first threshold value.
When the temperature is less than or equal to the first threshold value, the first insulating layer can reduce the possibility that the tab of the battery cell is in direct contact with the end of the cutting part, and reduce the possibility that the tab is cut off by the end of the cutting part in the stretching process.
When the temperature is higher than a first threshold value, the first insulating layer of the cutting part is melted, the lug can move towards the end part of the cutting part along with the expanded battery cell, when the lug moves to be connected with the cutting part, the end part of the cutting part can cut the lug, and therefore the connection between the battery cell and an external circuit is cut off. After the lug is cut off, the loop of the battery cell is disconnected, and the probability of safety failure during the overcharge of the battery pack is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.
Fig. 1 is a schematic top view of a portion of a battery pack according to an embodiment of the present application;
FIG. 2 is a side view of the connecting tab in an embodiment of the present application;
FIG. 3 is a schematic top view of the connecting tab in an embodiment of the present application;
fig. 4 is a schematic diagram of the battery pack according to an embodiment of the present application.
Detailed Description
The following provides a further description of a battery pack and an electric device designed in the present application with reference to the accompanying drawings and examples.
Referring to fig. 1 and 4, fig. 1 is a partial top view illustrating a battery pack according to an embodiment of the present disclosure, and fig. 4 is a schematic diagram illustrating the battery pack according to the embodiment of the present disclosure.
In this embodiment, the battery pack includes a battery cell 401 and a connection tab 101. The battery cell 401 includes a tab 402, the connecting sheet 101 is connected to the tab 402, and the connecting sheet 101 includes a cut portion 100 and a first insulating layer 104.
The battery cell 401 includes a single electrochemical cell including a positive electrode and a negative electrode, the tab 402 has a conductive property, and the tab 402 is a metal conductor in the battery cell 401 for leading out the positive electrode and the negative electrode.
In this embodiment, the tab 402 may be made of aluminum (Al), nickel (Ni), or copper-plated nickel (Ni — Cu) material. In other embodiments, the specific material of the tab 402 may be set as desired.
The connecting sheet 101 is a conductive connecting sheet, and optionally, the connecting sheet 101 includes at least one of a copper connecting sheet, an aluminum connecting sheet, and a steel connecting sheet. The connecting sheet 101 has high conductivity, and can obtain the electrical signal provided by the battery cell 401 through the tab 402 and transmit the electrical signal to other conductive devices connected to the connecting sheet 101.
In this embodiment, when the battery cell 401 is mounted to the connecting plate 101, the tab 402 of the battery cell 401 is welded to the connecting plate 101. The tab 402 is partially opposite to the end 103 of the cut part 100.
The end 103 of the cut portion 100 is disposed toward the tab 402. The end 103 of the cutting portion 100 corresponds to a region of gradually decreasing thickness on the connecting piece 101. When the battery cell 401 is overcharged, the battery cell 401 expands, the tab 402 can move toward the end 103 of the cutting part 100 along with the expanded battery cell 401, and after the first insulating layer 104 between the tab 402 and the end 103 of the cutting part 100 is melted and removed, the end 103 can cut the tab 402. In some implementations, the first insulating layer 104 includes an adhesive layer.
In this embodiment, the maximum thickness of the thinnest portion of the cutting portion 100 is 0.01 to 0.03 mm. The maximum thickness at which the end 103 of the cutting part 100 is thinnest is also set as required. The smaller the thickness of the thinnest portion of the end portion 103, the sharper the end portion 103 of the cutting portion 100. In some embodiments, the difficulty of cutting the tab 402 by the cutting portion 100 may be reduced by providing the thinner end portion 103 to be the thinnest.
The first insulation layer 104 is at least partially located between the tab 402 and the cut portion 100, and the first insulation layer 104 melts when the temperature is higher than a first threshold value. Optionally, the first insulating layer 104 wraps the entire cutting portion 100.
When the temperature is less than or equal to the first threshold value, the first insulation layer 104 may reduce direct contact between the cut portion 100 and the tab 402, and reduce the possibility that the tab 402 is cut off by the end 103 of the cut portion 100 during the stretching process.
When the temperature is higher than the first threshold value, the first insulating layer 104 will melt and be removed from the cutting part 100, and after the tab 402 is cut off, the circuit of the battery cell 401 is disconnected, so that the probability of safety failure during overcharge of the battery pack is reduced.
In some embodiments, when the battery cell 401 is overcharged, the battery cell 401 may heat up, the temperature of the tab 402 may also change, and the first threshold may be set to be less than or equal to the temperature of the tab 402 when the battery cell 401 is overcharged, so that the first insulating layer 104 may be melted by the temperature of the tab 402 when the battery cell 401 is overcharged.
When the battery cell 401 is overcharged, the temperature of the battery pack generally ranges from 60 ℃ to 120 ℃, and therefore the first threshold value may be set to be between 60 ℃ and 120 ℃. For example, the first insulating layer 104 having a melting point of 60 ℃ or higher and 80 ℃ or lower is selected. By setting the appropriate first threshold, the probability that the first insulating layer 104 melts when the battery cell 401 is overcharged can be increased, so that the probability that the tab 402 can be cut off by the cutting part 100 when the battery cell 401 is abnormal is increased, and the safety risk caused by overcharge of the battery cell 401 is reduced.
The battery pack also includes a PCB board 102. In this embodiment, the connecting sheet 101 is partially disposed on the PCB board 102, and the connecting sheet 101 is electrically connected to the conductive structure of the PCB board 102. After the battery cell 401 is mounted to the connecting sheet 101, it may be electrically connected to the conductive structure on the PCB board 102. Alternatively, the connecting plate 101 may also be applied to other devices, and is not limited to the connection with the tab 402 of the battery cell 401.
The cutting part 100 is located outside the PCB board 102, and the end 103 of the cutting part 100 is located outside the PCB board 102, so as to facilitate the cutting of the tab 402 by the end 103 of the cutting part 100.
In some embodiments, the distance between the cutting portion 100 and the PCB board 102 ranges from 0.1 mm to 4 mm. In other embodiments, the distance between the cutting portion 100 and the PCB board 102 may be set according to the requirement. For example, in one embodiment, the distance between the cutting portion 100 and the PCB 102 is set to 0.2 mm to 3mm, which is beneficial for the part of the tab 402 opposite to the end 103 of the cutting portion 100, and can reduce the possibility of deformation of the connecting piece 101 caused by the connecting piece 101 extending too far out of the PCB 102.
Referring to fig. 2 to 4, fig. 2 is a schematic side view of the connecting sheet 101 in an embodiment of the present application, and fig. 3 is a schematic top view of the connecting sheet 101 in an embodiment of the present application, it should be noted that fig. 3 does not show the first insulating layer 104, and the first insulating layer 104 is only distributed at the end portion 103 as shown in fig. 1.
In this embodiment, the first insulating layer 104 is not only located at the end portion 103, but also provided to the first surface 201 and the second surface 202 of the connecting tab 101, providing a more robust protection of the end portion 103. Alternatively, the first insulating layer 104 may be positioned as needed to block the direct contact between the cut portion 100 and the tab 402.
In some embodiments, the thickness of the first insulating layer 104 ranges from 0.05 mm to 3mm, which can better separate the end 103 and the tab 402. In some other embodiments, it may be set to 0.1 mm to 2 mm.
In the embodiment shown in fig. 3, a cutting structure is disposed at the edge of the cutting part 100, the cutting structure is integrally disposed with the cutting part 100, and the cutting structure is disposed at the thinnest position of the cutting part 100, so that the cutting speed can be further increased, and the tab can be cut off more quickly.
In some embodiments, the cutting structure 301 is disposed at the thinnest point of the end portion 103, and the cutting structure 301 is provided with serrations. When the tab 402 is cut, the end portion 103 is in direct contact with the tab 402, and the serrated cutting structure 301 provided at the end portion 103 can provide cutting force components in different directions, so that the tab 402 is cut more easily.
Alternatively, the shape of the cutting structure 301 may be selected as desired. For example, the cutting structure 301 may be configured as a sharp peak, a beveled edge, a sharp edge, or the like, or a combination thereof.
The battery pack realizes the connection between the battery cell 401 and the external circuit through the connecting sheet 101 with the cutting part 100, and the first insulating layer 104 is arranged to avoid the direct contact between the lug 402 of the battery cell 401 and the end part 103 of the cutting part 100 of the connecting sheet 101, so that when the peripheral temperature of the first insulating layer 104 does not reach a first threshold value, the situation that the lug 402 is cut off by the metal surface of the connecting sheet 101 in the stretching process is reduced. And the first insulating layer 104 can melt when the temperature is higher than the first threshold, and when the temperature is higher than the first threshold, the tab 402 can move towards the end 103 of the cutting part 100 along with the expanded battery cell 401, and when the tab moves to be connected with the cutting part 100, the cutting part 100 can disconnect the circuit of the battery cell 401, thereby reducing the occurrence of safety failure.
In an embodiment of the present application, there is also provided an electric device, where the electric device includes the battery pack described in the above embodiment. The electric equipment includes but is not limited to two-wheel electric vehicles, energy storage equipment, electric tools, cleaning tools, unmanned planes and the like.
The above-mentioned embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and the drawings, such as the combination of technical features between the embodiments and the direct or indirect application to other related technical fields, are also included in the scope of the present application.

Claims (8)

1. The utility model provides a battery pack, includes electric core and locates the connection piece outside the electric core, electric core includes utmost point ear, the connection piece with utmost point ear is connected, its characterized in that, the connection piece includes: the end part of the cutting part is arranged towards the pole lug;
a first insulating layer disposed on the surface of the cutting part, the first insulating layer being at least partially located between the tab and the cutting part, the first insulating layer melting when the temperature is higher than a first threshold value, so that the tab can be cut by the end of the cutting part;
the setting range of the first threshold is greater than or equal to 60 ℃ and less than or equal to 120 ℃;
the battery pack further comprises a PCB, the connecting piece portion is arranged on the PCB, and the cutting portion is located outside the PCB.
2. The battery of claim 1, wherein the first insulating layer comprises an adhesive layer having a melting point less than or equal to the first threshold.
3. The battery of claim 2, wherein the adhesive layer has a thickness in a range of 0.05 mm to 3 mm.
4. The battery pack according to claim 1, wherein the edge of the cutting part is provided with a cutting structure including at least one of serrations, spikes, a beveled edge, and a sharp edge.
5. The battery of claim 1, wherein the tabs comprise at least one of copper tabs, aluminum tabs, and steel tabs.
6. The battery pack according to claim 1, wherein the distance between the cutting part and the PCB board is in a range of 0.1-4 mm.
7. The battery pack according to claim 1, wherein the maximum thickness of the thinnest portion of the cutting part is 0.01 to 0.03 mm.
8. An electrical consumer, characterized in that the electrical consumer comprises a battery according to any one of claims 1-7.
CN202110601073.6A 2021-05-31 2021-05-31 Battery pack and electric equipment Active CN113363684B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110601073.6A CN113363684B (en) 2021-05-31 2021-05-31 Battery pack and electric equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110601073.6A CN113363684B (en) 2021-05-31 2021-05-31 Battery pack and electric equipment

Publications (2)

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CN113363684A CN113363684A (en) 2021-09-07
CN113363684B true CN113363684B (en) 2022-07-12

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Citations (2)

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Publication number Priority date Publication date Assignee Title
CN101479864A (en) * 2006-05-01 2009-07-08 株式会社Lg化学 Secondary battery having electrode with self cutting part to be destructed on application of over-current
CN108155335A (en) * 2016-12-02 2018-06-12 宁德时代新能源科技股份有限公司 assembly for secondary battery

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CN108155335A (en) * 2016-12-02 2018-06-12 宁德时代新能源科技股份有限公司 assembly for secondary battery

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