Battery

Abstract

The utility model provides a battery which comprises a shell, at least one electrode group and a reference electrode, wherein a groove is formed in the top of the shell, and the electrode group and the reference electrode are packaged in the shell; the reference electrode is provided with a built-in section built in the electrode group and an extension section which is connected with the built-in section and extends out of the shell, the extension section is used for being connected with test equipment, and the extension section can be placed in a groove in the top of the shell. According to the battery disclosed by the utility model, the reference electrode can be prevented from being damaged or broken in the battery manufacturing, transferring and testing processes, and the phenomenon that the test cannot be carried out in the later period is avoided, so that the safety and the use stability of a product can be improved, and the charging and discharging test requirements are favorably met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the production of existing three-electrode batteries, copper wire is usually implanted into the battery as a reference electrode, and then the copper wire is led out of the battery. The tiny copper wire is easily damaged during the battery production and testing process, causing the three-electrode battery to fail and fail to meet testing requirements. Utility Model Content

[0003] In view of this, the utility model aims to provide a battery to protect the reference electrode.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A battery comprises a shell with a groove on the top, and at least one electrode group and a reference electrode encapsulated in the shell;

[0006] The reference electrode has a built-in section built into the electrode group, and an extension section connected to the built-in section and extending out of the shell. The extension section is used to connect to the test equipment and can be placed in a groove on the top of the shell.

[0007] Furthermore, the electrode group includes a negative electrode sheet, a first diaphragm and a positive electrode sheet stacked in sequence; the reference electrode includes a first reference electrode and a second reference electrode, the built-in section of the first reference electrode is located between the negative electrode sheet and the first diaphragm, the built-in section of the second reference electrode is located between the first reference electrode and the first diaphragm, and a second diaphragm is provided between the negative electrode sheet and the first reference electrode, and a third diaphragm is provided between the first reference electrode and the second reference electrode, and the second diaphragm and the third diaphragm are the same as the first diaphragm.

[0008] Furthermore, the groove includes a first sub-groove arranged corresponding to the extension section in the first reference electrode, and a second sub-groove arranged corresponding to the extension section in the second reference electrode, and both the first sub-groove and the second sub-groove extend along the length direction of the shell.

[0009] Furthermore, when the battery includes a plurality of electrode groups, the plurality of electrode groups are stacked in sequence; two adjacent electrode groups are separated by a fourth diaphragm, and the fourth diaphragm is the same as the first diaphragm.

[0010] Furthermore, the built-in segment of the reference electrode is located in any of the electrode groups close to the middle part.

[0011] Furthermore, corresponding to the extension sections in the first reference electrode and the second reference electrode, free ends of both are connected to a connecting portion located outside the groove, and each of the connecting portions is used to connect to the testing device.

[0012] Furthermore, the connecting portion is in sheet form and is sleeved with a soft sleeve for protection.

[0013] Furthermore, along the extending direction of the extending section, the diameter of the soft sleeve is gradually increased.

[0014] Furthermore, the connecting portion is made of nickel sheet.

[0015] Furthermore, the housing is made of aluminum-plastic film; and / or the first reference electrode and the second reference electrode are both made of metal conductive wire.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery described in the utility model, by providing a groove on the top of the shell to place the extended section of the reference electrode, can prevent the extended section from being damaged or broken during the battery manufacturing, transfer and testing process, and avoid the phenomenon of being unable to test later. This forms protection for the reference electrode, improves the safety and stability of the battery product itself, and is conducive to meeting the testing requirements.

[0018] In addition, through the coordinated use of the first diaphragm, the second diaphragm, the third diaphragm, the first reference electrode and the second reference electrode, the potential difference of the negative electrode sheet, the potential difference between the negative electrode sheet and the first reference electrode, and the potential difference between the negative electrode sheet and the second reference electrode can be tested to correct the polarization caused by the introduction of the diaphragm in the three-electrode test, thereby effectively removing the deviation, thereby achieving the purpose of correcting the charging capacity, giving full play to the fast charging capability of the battery, and achieving the purpose of shortening the charging time.

[0019] Secondly, the coordination of the first sub-slot and the second sub-slot, in addition to protecting the extended sections of the first reference electrode and the second reference electrode, can also simply distinguish the number of membrane layers between the monitoring potential of the first reference electrode and the second reference electrode and the surface potential of the negative electrode, thereby improving the test efficiency. The built-in section of the reference electrode is located in any electrode group near the middle part, which is conducive to unifying the standards of the finished battery and facilitating the subsequent testing work.

[0020] In addition, the free end of the extension section is connected to a connection portion outside the groove, which is convenient for connecting the reference electrode to the test equipment, and the connection portion is in the form of a sheet, which is conducive to ensuring the reliability of the electrical connection. At the same time, the setting of the soft sleeve can not only protect the nickel sheet from damage during the battery manufacturing and transfer process, but also can be easily turned outward during the test to leak out the nickel sheet, ensuring the smooth implementation of the battery test operation. Along the extension direction of the extension section, the diameter size of the soft sleeve is gradually set to increase, which is conducive to improving the convenience of turning outward of the soft sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic structural diagram of a first example of a battery according to an embodiment of the utility model;

[0023] Figure 2 for Figure 1 a top view of the structure shown;

[0024] Figure 3 This is a schematic structural diagram of the first reference electrode described in an embodiment of the utility model;

[0025] Figure 4 This is a schematic structural diagram of a second example of a battery according to an embodiment of the present utility model;

[0026] Description of reference numerals:

[0027] 11. housing; 111. first sub-slot; 112. second sub-slot;

[0028] 21. negative electrode sheet; 22. positive electrode sheet; 23. first diaphragm; 24. second diaphragm; 25. third diaphragm; 26. fourth diaphragm;

[0029] 30a, first reference electrode; 30b, second reference electrode; 31, built-in section; 32, extension section; 33, connecting portion;

[0030] 40. Soft casing. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] The present embodiment relates to a battery, which can protect the exposed portion of the reference electrode to prevent the exposed portion from being damaged or broken during the manufacturing, transfer and testing processes, thereby preventing the subsequent testing from occurring. This can improve the product stability of the battery and help meet corresponding testing requirements.

[0036] In terms of overall structure, Figure 1 and Figure 3 As shown, the battery of this embodiment includes a shell 11 with a groove on the top, and at least one electrode group and a reference electrode encapsulated in the shell 11.

[0037] The reference electrode has a built-in section 31 built into the electrode group, and an extension section 32 connected to the built-in section 31 and extending out of the shell 11. The extension section 32 is used to connect to the test equipment, and the extension section 32 can be placed in a groove on the top of the shell 11.

[0038] It is worth mentioning that the relevant structural parts not mentioned in the battery of this embodiment can refer to the common three-electrode battery cell structure or the various structures of three-electrode battery products in the prior art. For example, the outer shell 11 of this embodiment also encapsulates an electrolyte, and at least part of each pole group and part of the reference electrode are immersed in the electrolyte.

[0039] Based on the above overall introduction, specifically, in this embodiment, as a preferred implementation form, see Figure 1 and Figure 2As shown, the electrode group includes a negative electrode sheet 21, a first separator 23 and a positive electrode sheet 22 which are stacked in sequence.

[0040] Furthermore, the reference electrode includes a first reference electrode 30a and a second reference electrode 30b, the built-in segment 31 of the first reference electrode 30a is located between the negative electrode sheet 21 and the first diaphragm 23, the built-in segment 31 of the second reference electrode 30b is located between the first reference electrode 30a and the first diaphragm 23, and a second diaphragm 24 is provided between the negative electrode sheet 21 and the first reference electrode 30a, and a third diaphragm 25 is provided between the first reference electrode 30a and the second reference electrode 30b, and the second diaphragm 24 and the third diaphragm 25 are the same as the first diaphragm 23.

[0041] It can be understood that, through the coordinated use of the first diaphragm 23, the second diaphragm 24, the third diaphragm 25, the first reference electrode 30a and the second reference electrode 30b, the potential difference of the negative electrode sheet 21, the potential difference between the negative electrode sheet 21 and the first reference electrode 30a, and the potential difference between the negative electrode sheet 21 and the second reference electrode 30b can be tested to correct the polarization caused by the introduction of the diaphragm in the three-electrode test;

[0042] This effectively removes the deviation and measures a more accurate negative electrode potential during the charging process, which in turn provides more accurate data support for determining whether lithium deposition occurs in lithium batteries. This can achieve the purpose of correcting the charging capacity, give full play to the fast charging capability of the battery, and shorten the charging time.

[0043] To elaborate, in this embodiment, the first reference electrode 30a is used to detect the potential of the negative electrode separated by one layer of diaphragm, which can be denoted as V1, and the second reference electrode 30b is used to detect the potential of the negative electrode separated by two layers of diaphragm, which can be denoted as V2. The polarization value caused by the diaphragm is V2-V1, and the negative electrode potential Vr=V1-(V2-V1)=2V1-V2 can be obtained when the negative electrode has no diaphragm.

[0044] In this way, the battery charging strategy can be formulated based on Vr, and the battery charging capacity can be judged in combination with the lithium plating phenomenon after disassembly, thereby achieving the effect of more fully utilizing the battery's fast charging capability (the testing process of this part can refer to the test experiments familiar to technical personnel in this field, such as the test method disclosed in the Chinese invention patent with authorization number CN113258156B).

[0045] And, as a preferred implementation form, see Figure 2 As shown, in this embodiment, the groove includes a first sub-groove 111 arranged corresponding to the extension section 32 in the first reference electrode 30a, and a second sub-groove 112 arranged corresponding to the extension section 32 in the second reference electrode 30b, and both the first sub-groove 111 and the second sub-groove 112 extend along the length direction of the shell 11.

[0046] Here, the coordinated arrangement of the first sub-groove 111 and the second sub-groove 112, in addition to being able to protect the extension section 32 in the first reference electrode 30a and the second reference electrode 30b, can also simply distinguish the number of membrane layers between the monitoring potential of the first reference electrode 30a and the second reference electrode 30b and the negative electrode surface potential, thereby improving the test efficiency.

[0047] Secondly, in this embodiment, as a preferred implementation form, see Figure 4 As shown, when the battery includes multiple electrode groups, the multiple electrode groups are stacked in sequence. Two adjacent electrode groups are separated by a fourth separator 26 , and the fourth separator 26 is the same as the first separator 23 .

[0048] Furthermore, in the specific implementation, in this embodiment, as a preferred implementation form, the built-in segment 31 of the reference electrode is located in any electrode group near the middle part. The advantage of this arrangement is that it is conducive to unifying the standards of battery products and facilitating the subsequent testing work.

[0049] In addition, in this embodiment, as a preferred implementation form, corresponding to the extension sections 32 in the first reference electrode 30a and the second reference electrode 30b, the free ends of both are connected with a connection portion 33 located outside the groove, and each connection portion 33 is used to connect to the test equipment, thereby improving the convenience of connecting the reference electrode to the test equipment.

[0050] It is worth mentioning here that the test equipment of this embodiment is related equipment for testing existing three-electrode batteries or three-electrode cells, such as charging and discharging equipment. At the same time, since the first reference electrode 30a and the second reference electrode 30b have the same structure, this embodiment Figure 3 Only the first reference electrode 30a is shown schematically.

[0051] Also, see Figure 3 As shown, as a preferred implementation form, the connecting portion 33 of this embodiment is in a sheet shape and is sleeved with a soft sleeve 40 for protection.

[0052] By setting the connecting part 33 to be in a sheet shape, it is helpful to ensure the reliability of electrical connection. At the same time, the setting of the soft sleeve 40 can not only protect the nickel sheet from damage during battery manufacturing and transfer, but also can be easily turned outward during testing to leak out the nickel sheet, thereby ensuring the smooth implementation of battery testing operations.

[0053] Considering the convenience of connecting the connection part 33 with the test equipment, in this embodiment, as a preferred implementation form, the diameter of the soft sleeve 40 is gradually increased along the extension direction of the extension section 32. This can improve the convenience of everting the soft sleeve 40. When the connection part 33 is needed, the outer end of the soft sleeve 40 is everted to expose the connection part 33.

[0054] In the specific implementation, in this embodiment, as a preferred implementation form, the connection part 33 adopts a nickel sheet to ensure that it has a good electrical connection effect with the test equipment. At the same time, the soft sleeve 40 can be a soft rubber sleeve well known to those skilled in the art.

[0055] In addition, in this embodiment, as a preferred implementation form, the housing 11 is made of aluminum plastic film, that is, the battery in this embodiment is particularly a soft pack battery. Furthermore, also as a preferred implementation form, the first reference electrode 30a and the second reference electrode 30b are both made of metal conductive wire to ensure good conductivity and test effectiveness. In specific implementation, the metal conductive wire here can preferably be copper wire.

[0056] The battery of this embodiment, by providing a groove on the top of the outer shell 11 to place the extension section 32 of the reference electrode, can prevent the extension section 32 from being damaged or broken during the battery manufacturing, transfer and testing process, and avoid the phenomenon of being unable to test later, thereby improving the safety and stability of the product itself, and further facilitating meeting the testing requirements.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: It comprises a shell with a groove on the top, and at least one electrode group and a reference electrode encapsulated in the shell; The reference electrode has a built-in section built into the electrode group, and an extension section connected to the built-in section and extending out of the shell. The extension section is used to connect to the test equipment and can be placed in a groove on the top of the shell.

2. The battery according to claim 1, characterized in that: The electrode group comprises a negative electrode sheet, a first separator and a positive electrode sheet stacked in sequence; The reference electrode includes a first reference electrode and a second reference electrode, the built-in section of the first reference electrode is located between the negative electrode sheet and the first diaphragm, the built-in section of the second reference electrode is located between the first reference electrode and the first diaphragm, a second diaphragm is provided between the negative electrode sheet and the first reference electrode, and a third diaphragm is provided between the first reference electrode and the second reference electrode, and the second diaphragm and the third diaphragm are the same as the first diaphragm.

3. The battery according to claim 2, characterized in that: The groove includes a first sub-groove arranged corresponding to the extension section in the first reference electrode, and a second sub-groove arranged corresponding to the extension section in the second reference electrode, and both the first sub-groove and the second sub-groove extend along the length direction of the shell.

4. The battery according to claim 2, characterized in that: When the battery comprises a plurality of electrode groups, the plurality of electrode groups are stacked in sequence; Two adjacent pole groups are separated by a fourth diaphragm, and the fourth diaphragm is the same as the first diaphragm.

5. The battery according to claim 4, characterized in that: The built-in section of the reference electrode is located in any one of the electrode groups near the middle portion.

6. The battery according to claim 2, characterized in that: Corresponding to the extension sections in the first reference electrode and the second reference electrode, free ends of both are connected to a connecting portion located outside the groove, and each of the connecting portions is used to be connected to the testing device.

7. The battery according to claim 6, characterized in that: The connecting part is in sheet shape and is sleeved with a soft sleeve for protection.

8. The battery according to claim 7, characterized in that: Along the extending direction of the extending section, the diameter of the soft sleeve is gradually increased.

9. The battery according to claim 7, characterized in that: The connecting portion is made of nickel sheet.

10. The battery according to any one of claims 2 to 9, characterized in that: The housing is made of aluminum-plastic film; and / or the first reference electrode and the second reference electrode are both made of metal conductive wire.

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