CN214254673U - Battery module capable of preventing electrochemical corrosion - Google Patents
Battery module capable of preventing electrochemical corrosion Download PDFInfo
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- CN214254673U CN214254673U CN202120336434.4U CN202120336434U CN214254673U CN 214254673 U CN214254673 U CN 214254673U CN 202120336434 U CN202120336434 U CN 202120336434U CN 214254673 U CN214254673 U CN 214254673U
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- 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
Abstract
The utility model relates to the technical field of electrochemical corrosion of batteries, and discloses a battery module for preventing electrochemical corrosion, which comprises an electric core, a first external element and a second external element, wherein the electric core comprises an electric core body, a protective film, an anode tab and a cathode tab, the protective film comprises a conductive layer electrically connected with the anode tab, and two ends of the first external element are respectively electrically connected with the conductive layer and the cathode tab; two ends of the second external element are respectively electrically connected with the positive pole lug and the conductive layer; the first external element is configured to be communicated when a first potential of the conductive layer is equal to or greater than a preset potential when the conductive layer is electrically connected with the first external element; the second external element is configured to communicate when the first potential is less than a preset potential, and a second potential of the conductive layer can be greater than or equal to the preset potential when the conductive layer is electrically connected with the second external element. The utility model discloses a prevent electrochemical corrosion's battery module has reduced the conducting layer and has taken place electrochemical corrosion's probability, has increased the security of electric core.
Description
Technical Field
The utility model relates to an electrochemical corrosion technical field of battery especially relates to a prevent electrochemical corrosion's battery module.
Background
The battery module mainly comprises a shell, a battery core, a busbar, a flexible circuit board and the like, wherein the battery core comprises a battery core body, a positive pole lug, a negative pole lug, a protective film and the like. The conventional battery module which is commonly used is a soft package lithium ion battery, the protective film is an aluminum plastic film, and the soft package lithium ion battery is widely applied to various new energy equipment due to the characteristics of high specific energy, good safety, flexible design and the like. Although the aluminum-plastic film can reduce the weight of the battery cell and improve the energy density of the battery cell, the aluminum-plastic film is also easy to corrode and damage, and loses the protection effect on the battery cell body. The aluminum-plastic film generally comprises an outer nylon layer or a polyethylene terephthalate layer, a middle aluminum layer and an inner polypropylene layer, wherein the polypropylene layer plays a role in adhesion and sealing in the packaging process, but the polypropylene layer cannot be completely flawless in the manufacturing process or the subsequent packaging and forming process, and the polypropylene layer is very easy to crack. The electrolyte penetrates into these cracks and comes into contact with the aluminum layer, forming ion paths. If an electronic circuit is generated between the aluminum layer and the negative electrode, the aluminum layer and lithium ions in the electrolyte can generate alloy reaction to form lithium-aluminum alloy, so that the aluminum-plastic film generates electrochemical corrosion, and finally the aluminum-plastic film cracks, and the battery core leaks, and when the electrochemical corrosion occurs, the potential of the aluminum layer is generally below 0.3V.
In the prior art, in order to judge whether the electric core is corroded, the electric potential of the aluminum layer is mainly monitored, and if the electric potential of the aluminum layer is lower than 0.3V, the electric core is considered to have a corrosion risk, and the electric core with the lower electric potential needs to be discharged in time; and the aluminum layer of the aluminum-plastic film is electrically connected with the positive electrode tab in a welding, riveting, conductive adhesive and other connecting modes, so that the potential of the aluminum-plastic film is improved, and the probability of electrochemical corrosion of the aluminum-plastic film is reduced. Although these methods for preventing the cell from corrosion can reduce the probability of electrochemical corrosion of the aluminum plastic film to some extent, these methods are directed to a single cell, especially to a cell in production, and are not suitable for a cell that has already been produced.
SUMMERY OF THE UTILITY MODEL
Based on above, an object of the utility model is to provide a prevent electrochemical corrosion's battery module, the conducting layer that has reduced the protection film of electric core takes place electrochemical corrosion's probability, has increased the security of electric core.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a battery module for preventing electrochemical corrosion, comprising: the battery comprises a battery core, a protective film, a positive electrode lug and a negative electrode lug, wherein the protective film is wrapped outside the battery core, the protective film comprises a conductive layer, the conductive layer is electrically connected with the positive electrode lug, and the positive electrode lug and the negative electrode lug are respectively arranged on the battery core; the two ends of the first external element are respectively and electrically connected with the conducting layer and the negative electrode lug; the two ends of the second external element are respectively and electrically connected with the positive electrode lug and the conductive layer; when the conducting layer is electrically connected with the first external element, the potential of the conducting layer is a first potential, and when the first potential is equal to or greater than a preset potential, the first external element is configured to be connected and the second external element is configured to be disconnected; the second external element is configured to be connected and the first external element is configured to be disconnected when the first potential is less than the preset potential, the potential of the conductive layer is a second potential when the conductive layer is electrically connected with the second external element, and the second potential can be greater than or equal to the preset potential.
As a preferable scheme of the battery module for preventing electrochemical corrosion, the first external element comprises a first voltmeter, and two ends of the first voltmeter are respectively and electrically connected with the conductive layer and the negative electrode tab.
As a preferable mode of the battery module for preventing electrochemical corrosion, the second external element includes a second voltmeter, and both ends of the second voltmeter are electrically connected with the positive electrode tab and the conductive layer, respectively.
As a preferable mode of the battery module for preventing electrochemical corrosion, the second external element includes a resistor, both ends of which are electrically connected to the positive electrode tab and the conductive layer, respectively.
As a preferable mode of the battery module for preventing electrochemical corrosion, the preset potential is 0.3V.
As an optimal scheme of the battery module for preventing electrochemical corrosion, the battery core body comprises pole pieces and diaphragms, the pole pieces comprise positive pole pieces and negative pole pieces, the diaphragms are arranged between the positive pole pieces and between the negative pole pieces and between the pole pieces and the protective films, the positive pole pieces are provided with positive pole lugs, and the negative pole pieces are provided with negative pole lugs.
As a preferable mode of the electrochemical corrosion prevention battery module, the electrochemical corrosion prevention battery module further includes an electrical connector, one end of which is electrically connected to the conductive layer, and the other end of which is selectively electrically connected to the first external element and the second external element, so that the first external element can be connected to the conductive layer through the electrical connector, or the second external element can be connected to the conductive layer through the electrical connector.
As a preferred scheme of the battery module for preventing electrochemical corrosion, the number of the battery cells is at least two, and each battery cell is respectively electrically connected with the first external element and the second external element.
As a preferred scheme of preventing electrochemical corrosion's battery module, the protection film includes the plastic-aluminum membrane, the plastic-aluminum membrane still includes inlayer and skin, the conducting layer is the aluminium lamination, the aluminium lamination is located the inlayer with between the skin, the inlayer the aluminium lamination reaches the skin bonds in proper order, the inlayer can with the laminating of electricity core body.
As a preferable scheme of the battery module for preventing electrochemical corrosion, the inner layer is a polypropylene layer, and the outer layer is a nylon layer or a polyethylene terephthalate layer.
The utility model has the advantages that: the utility model discloses a prevent electrochemical corrosion's battery module, conducting layer and anodal utmost point ear electricity are connected, first external component can communicate with negative pole utmost point ear and conducting layer, when electric core normal operating, because predetermine the electric potential that electric potential takes place electrochemical corrosion for the conducting layer and reach, in case first electric potential is less than predetermineeing electric potential, it probably can take place electrochemical corrosion to show the conducting layer, then, second external component and anodal utmost point ear and conducting layer intercommunication, anodal utmost point ear, the conducting layer and the second external component constitute the intercommunication return circuit, make the second electric potential of conducting layer can improve and be greater than predetermineeing electric potential, the probability that electrochemical corrosion takes place for the conducting layer has been reduced, the security of electric core has been increased.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic view of a battery module for preventing electrochemical corrosion according to an embodiment of the present invention;
fig. 2 is a schematic view of a battery module for preventing electrochemical corrosion according to another embodiment of the present invention.
In the figure:
1. an electric core; 11. a positive electrode tab; 12. a negative electrode tab; 2. a first voltmeter; 3. a second voltmeter; 4. a resistor; 5. an electrical connection.
Detailed Description
In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a prevent electrochemical corrosion's battery module, as shown in fig. 1, including electric core 1, first external component and the external component of second, electric core 1 includes the electric core body, the protection film, anodal utmost point ear 11 and negative pole utmost point ear 12, the outer parcel of electric core body has the protection film, the protection film includes the conducting layer, the conducting layer is connected with anodal utmost point ear 11 electricity, specifically, anodal utmost point ear 11 can be for the welding with the electric connection mode of conducting layer, the riveting, conducting resin bonds etc., specifically set up according to actual need, anodal utmost point ear 11 and negative pole utmost point ear 12 set up respectively on the electric core body, the both ends of first external component are connected with conducting layer and negative pole utmost point ear 12 electricity respectively, the both ends of the external component of second are connected with anodal utmost point ear 11 and conducting layer electricity respectively. When the conducting layer is electrically connected with the first external connection element, the potential of the conducting layer is a first potential, and when the first potential is equal to or greater than a preset potential, the first external connection element is connected and the second external connection element is disconnected; the second external element is configured to be connected and the first external element is configured to be disconnected when the first potential is less than the preset potential, the potential of the conductive layer is a second potential when the conductive layer is electrically connected with the second external element, and the second potential can be greater than or equal to the preset potential.
Specifically, the preset potential of the embodiment is 0.3V, during normal operation, two ends of the first external element are electrically connected with the conductive layer and the negative electrode tab 12, once the first potential of the conductive layer is less than 0.3V and cracks are generated on the inner wall of the protective film, the risk of electrochemical corrosion of the conductive layer is high, at this time, in order to prevent the conductive layer of the battery module from being electrochemically corroded, the potential of the conductive layer needs to be increased, at this time, the first external element is disconnected from the negative electrode tab 12 and the conductive layer, the second external element is electrically connected with the positive electrode tab 11 and the conductive layer, the second potential of the conductive layer is higher than the first potential, and the second potential is higher than the preset potential, so that the probability of electrochemical corrosion of the conductive layer is reduced.
The conducting layer and the positive pole lug 11 of the battery module for preventing electrochemical corrosion of this embodiment are electrically connected, first external component can communicate with negative pole lug 12 and conducting layer, when electric core 1 normally operates, because the electric potential that reaches takes place electrochemical corrosion for the conducting layer is predetermine to the electric potential, in case first electric potential is less than predetermine the electric potential, it indicates that electrochemical corrosion can probably take place for the conducting layer, at this moment, second external component and positive pole lug 11 and conducting layer intercommunication, positive pole lug 11, the conducting layer and the external component of second constitute the intercommunication return circuit, make the second electric potential of conducting layer can improve and be greater than predetermine the electric potential, the probability that electrochemical corrosion takes place for the conducting layer has been reduced, electric core 1's security has been increased.
Specifically, as shown in fig. 1, the first external component of this embodiment is a first voltmeter 2, the resistance of the first voltmeter 2 is a first resistance, the first resistance is 10G Ω, and two ends of the first voltmeter 2 are electrically connected to the conductive layer and the negative electrode tab 12, respectively. As shown in fig. 1, the second external element includes a second voltmeter 3, a resistance of the second voltmeter 3 is a second resistance, the second resistance is 10G Ω, and two ends of the second voltmeter 3 are electrically connected to the positive electrode tab 11 and the conductive layer, respectively. Because the first external component of this embodiment is first voltmeter 2, the voltage value that first voltmeter 2 surveyed is the difference of the electric potential of conducting layer and negative pole utmost point ear 12, can obtain the electric potential of conducting layer according to the voltage value that first voltmeter 2 surveyed, and then judge whether need switch to electric core 1 and be connected with the second external component. In other embodiments, the first resistance and the second resistance are not limited to the limitation of this embodiment, and may also be other values, and the first resistance and the second resistance may also be different, and are selected according to actual needs, in other embodiments, as shown in fig. 2, the second voltmeter 3 may also be replaced by a resistor 4, and two ends of the resistor 4 are electrically connected with the positive electrode tab 11 and the conductive layer, respectively.
Because the first resistance of first voltmeter 2 of this embodiment and the second resistance of second voltmeter 3 are all bigger, even the short circuit takes place for electric core 1 is inside, still can guarantee this prevent electrochemical corrosion's battery module's electric current in safety range, reduced because overheated probability that causes the probability of burning on fire and explosion, promoted this prevent electrochemical corrosion's battery module's security.
The battery cell body of the embodiment comprises a pole piece and a diaphragm, wherein the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm is arranged between the positive pole piece and the negative pole piece and between the pole piece and the protective film, the positive pole piece is provided with a positive pole lug 11, and the negative pole piece is provided with a negative pole lug 12. The pole piece and the diaphragm of this embodiment form electric core body through the mode of coiling or overlapping, and the diaphragm between pole piece and the protection film further has made negative pole piece and conducting layer to take place the probability of short circuit through electrolyte when the inner wall of protection film produced the crackle, has improved this security that prevents electrochemical corrosion's battery module.
As shown in fig. 1, the electrochemical corrosion prevention battery module of the present embodiment further includes an electrical connector 5, one end of the electrical connector 5 is electrically connected to the conductive layer, and the other end of the electrical connector 5 is selectively electrically connected to the first external element and the second external element, so that the first external element can be connected to the conductive layer through the electrical connector 5, or the second external element can be connected to the conductive layer through the electrical connector 5. Specifically, when the electrical connector 5 is communicated with the first external element, one end of the first external element is electrically connected with the conductive layer through the electrical connector 5, and the other end of the first external element is electrically connected with the negative electrode tab 12; when the electrical connector 5 communicates with the second external element, one end of the second external element is electrically connected to the conductive layer through the electrical connector 5, and the other end of the second external element is electrically connected to the positive electrode tab 11. The electrical connector 5 of this embodiment is a single-pole double-throw switch, which is specifically commercially available and will not be described herein. In other embodiments, the electrical connector 5 may also be composed of other switches having a movable end and two fixed ends, wherein the movable end is electrically connected to the conductive layer, the two fixed ends are electrically connected to the positive electrode tab 11 and the negative electrode tab 12, respectively, and the movable end can be communicated with one of the two fixed ends.
As shown in fig. 1, the number of the battery cells 1 in this embodiment is three, the three battery cells 1 are arranged face to face, the conductive layer and the negative electrode tab 12 of the protective film of each battery cell 1 are electrically connected to the first external component, and the positive electrode tab 11 of each battery cell 1 and the conductive layer of the protective film are electrically connected to the second external component. In other embodiments, the number of the battery cells 1 may be one, two, or more than three, and is specifically set according to actual needs.
The protection film of this embodiment is the plastic-aluminum membrane, and the plastic-aluminum membrane still includes inlayer and skin, and the conducting layer is the aluminium lamination, and the aluminium lamination is located between inlayer and the skin, and inlayer, aluminium lamination and skin bond in proper order, and the inlayer can laminate with electric core body. Specifically, the inner layer of this embodiment is a polypropylene layer, and the outer layer is a nylon layer or a polyethylene terephthalate layer.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles 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, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A battery module for preventing electrochemical corrosion, comprising:
the battery cell comprises a battery cell body (1), a protective film, a positive electrode tab (11) and a negative electrode tab (12), wherein the protective film is wrapped outside the battery cell body, the protective film comprises a conductive layer, the conductive layer is electrically connected with the positive electrode tab (11), and the positive electrode tab (11) and the negative electrode tab (12) are respectively arranged on the battery cell body;
the two ends of the first external element are respectively and electrically connected with the conducting layer and the negative pole lug (12);
a second external element, both ends of which are electrically connected with the positive electrode tab (11) and the conductive layer, respectively;
when the conducting layer is electrically connected with the first external element, the potential of the conducting layer is a first potential, and when the first potential is equal to or greater than a preset potential, the first external element is configured to be connected and the second external element is configured to be disconnected; the second external element is configured to be connected and the first external element is configured to be disconnected when the first potential is less than the preset potential, the potential of the conductive layer is a second potential when the conductive layer is electrically connected with the second external element, and the second potential can be greater than or equal to the preset potential.
2. The electrochemical corrosion prevention battery module according to claim 1, wherein the first external element comprises a first voltmeter (2), and two ends of the first voltmeter (2) are electrically connected with the conductive layer and the negative electrode tab (12), respectively.
3. The electrochemical corrosion prevention battery module according to claim 2, wherein the second external element comprises a second voltmeter (3), and both ends of the second voltmeter (3) are electrically connected with the positive electrode tab (11) and the conductive layer, respectively.
4. The electrochemical corrosion prevention battery module according to claim 2, wherein the second external element comprises a resistor (4), and both ends of the resistor (4) are electrically connected with the positive electrode tab (11) and the conductive layer, respectively.
5. The electrochemical corrosion prevention battery module according to claim 1, wherein the preset potential is 0.3V.
6. The battery module for preventing electrochemical corrosion according to claim 1, wherein the cell body comprises a pole piece and a diaphragm, the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm is disposed between the positive pole piece and the negative pole piece and between the pole piece and the protective film, the positive pole tab (11) is disposed on the positive pole piece, and the negative pole tab (12) is disposed on the negative pole piece.
7. The electrochemical corrosion prevention battery module according to claim 1, further comprising an electrical connector (5), wherein one end of the electrical connector (5) is electrically connected to the conductive layer, and the other end of the electrical connector (5) is selectively electrically connected to the first external element and the second external element, so that the first external element can be connected to the conductive layer through the electrical connector (5) or the second external element can be connected to the conductive layer through the electrical connector (5).
8. The electrochemical corrosion prevention battery module according to claim 1, wherein the number of the battery cells (1) is at least two, and each battery cell (1) is electrically connected to the first external connection element and the second external connection element respectively.
9. The battery module for preventing electrochemical corrosion according to claim 1, wherein the protective film comprises an aluminum-plastic film, the aluminum-plastic film further comprises an inner layer and an outer layer, the conductive layer is an aluminum layer, the aluminum layer is located between the inner layer and the outer layer, the inner layer, the aluminum layer and the outer layer are sequentially bonded, and the inner layer can be attached to the cell body.
10. The electrochemical corrosion prevention battery module according to claim 9, wherein the inner layer is a polypropylene layer, and the outer layer is a nylon layer or a polyethylene terephthalate layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120336434.4U CN214254673U (en) | 2021-02-05 | 2021-02-05 | Battery module capable of preventing electrochemical corrosion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120336434.4U CN214254673U (en) | 2021-02-05 | 2021-02-05 | Battery module capable of preventing electrochemical corrosion |
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| CN214254673U true CN214254673U (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948758A (en) * | 2021-09-30 | 2022-01-18 | 珠海冠宇电池股份有限公司 | Battery and battery repairing method |
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2021
- 2021-02-05 CN CN202120336434.4U patent/CN214254673U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113948758A (en) * | 2021-09-30 | 2022-01-18 | 珠海冠宇电池股份有限公司 | Battery and battery repairing method |
| CN113948758B (en) * | 2021-09-30 | 2023-09-26 | 珠海冠宇电池股份有限公司 | Battery and battery repairing method |
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