Battery top cover, battery and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover, a battery and a battery pack. The battery top cover is applied to the secondary battery and comprises a cover plate, a sealing cover and a test wire, a first through hole is formed in the cover plate, a sealing plug is inserted into the first through hole in a limited mode, a second through hole is formed in the sealing plug in a penetrating mode, one end of the test wire is arranged in an electrode assembly, and the other end of the test wire penetrates through the second through hole in a limited mode. According to the battery top cover, on the basis that the sealing performance of the secondary battery is guaranteed through the sealing plug, the testing lead led out of the sealing plug can be connected with testing equipment to monitor potential information of a positive electrode or a negative electrode of an internal electrode assembly of the secondary battery in real time, the testing requirement is met, and the testing efficiency is improved. In addition, the battery top cover is applied to the battery, so that the battery can independently detect the positive plate or the negative plate in the electrode assembly through the test wire, and the test safety and reliability can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery top cover, battery and battery package. BACKGROUND

[0002] The traditional secondary battery is a typical two-electrode system, and the potential difference between the positive electrode and the negative electrode, i.e. the voltage of the battery, is used to represent the charge and discharge state of the battery. Through the change of the single positive and negative electrode potential, the potential information of the reaction on the positive and negative electrodes in the battery can be obtained. However, the two-electrode battery system of the positive and negative electrodes cannot directly obtain the polarization characteristics of the single electrode, and a reference electrode needs to be set in the battery to separate and quantify the signals from the positive and negative electrodes, so that the characteristics of each electrode and its influence on the overall performance of the battery can be studied separately.

[0003] In actual production, three-electrode testing needs to be performed on the secondary battery, but the existing battery top cover cannot match the production and testing of the three-electrode battery. Therefore, there is an urgent need for a battery top cover and a secondary battery with the same, which can meet the safety testing requirements of the three-electrode battery. SUMMARY

[0004] One object of the utility model is to provide a battery top cover that can meet the safety testing requirements during single-polarity detection of the battery.

[0005] To achieve this object, the utility model adopts the following technical solutions:

[0006] The battery top cover is applied to a secondary battery and comprises a cover plate, a sealing plug, and a test lead. The cover plate has a first through hole. The sealing plug is limitingly inserted into the first through hole, and a second through hole is formed through the sealing plug. One end of the test lead is arranged inside an electrode assembly, and the other end of the test lead is limitingly inserted through the second through hole.

[0007] Preferably, the sealing plug comprises a sealing plug body and a fastening structure. The sealing plug body is limitingly inserted into the first through hole and has the second through hole formed therethrough. The fastening structure is used to fixedly connect the test lead in the second through hole.

[0008] Preferably, a third through hole is formed through the sealing plug body. The third through hole and the second through hole are arranged at intervals. The fastening structure is inserted into the third through hole in an interference fit, so that part of the sealing plug body between the third through hole and the second through hole can be expanded and deformed in the direction of the axis close to the second through hole, so as to clamp the test lead.

[0009] As preferred, the third perforation is a circular hole, the fastening structure comprises a threaded section, the threaded section is spirally arranged in the third perforation, and the horizontal sectional area of the threaded section is greater than the horizontal sectional area of the third perforation.

[0010] As preferred, the second perforation is a crescent hole, and the concave surface of the second perforation is oppositely arranged to the convex surface of the third perforation.

[0011] As preferred, the outer peripheral surface of the sealing plug body is provided with an annular flange, the inner side wall of the first perforation is provided with an annular groove, and the annular flange is clamped in the annular groove.

[0012] As preferred, the annular flange comprises a waist flange and a head flange, the waist flange is protrusively arranged at the middle position of the side wall of the sealing plug body and is clamped in the annular groove, and the head flange is protrusively arranged at one end of the side wall of the sealing plug body away from the electrode assembly and is press-connected to the upper side surface of the cover plate.

[0013] As preferred, the sealing plug is a rubber plug or a silica gel plug.

[0014] The battery top cover has the advantages that: on the basis of ensuring the sealing performance of the secondary battery by the sealing plug, the test device can be connected through the test lead wire led out from the sealing plug, the test lead wire can be used as a reference electrode, the potential information of the positive electrode or the negative electrode of the electrode assembly in the secondary battery can be monitored in real time, and the safety test requirements are met.

[0015] Another purpose of the utility model is to provide a battery which can meet the test requirements during the single polarity detection of the battery and ensure the reliability and safety of the test.

[0016] To achieve the purpose, the utility model adopts the following technical scheme:

[0017] The battery comprises a shell, an electrode assembly and the above-mentioned battery top cover, the shell has an inner cavity for placing the electrode assembly, the cover plate sealing cover of the battery top cover is arranged at the open port of the shell, and the test lead wire of the battery top cover is electrically connected to the electrode assembly.

[0018] The battery has the advantages that: the first perforation is arranged on the cover plate in the battery top cover, the sealing plug is sealingly inserted into the first perforation, and the test lead wire is limited in the sealing plug, the test lead wire can be used as a reference electrode at this time, the positive plate or the negative plate in the electrode assembly can be detected separately through the test lead wire, and the safety and reliability of the test can be ensured.

[0019] Another purpose of the utility model lies in providing a battery pack which can meet the test requirement of battery single polarity detection and ensure the reliability and safety of the test.

[0020] To achieve the purpose, the utility model adopts the following technical scheme:

[0021] The battery pack comprises the battery.

[0022] The battery pack has the advantages that the first perforation is arranged on the cover plate in the battery top cover, the sealing plug is sealingly inserted into the first perforation, the test lead is limited through the sealing plug, the test lead can be used as a reference electrode at the moment, the positive plate or the negative plate in the electrode assembly can be detected separately through the test lead, the detection efficiency is improved, and the safety and reliability of the battery pack during the test are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The utility model provides a top view of the cover plate;

[0024] Figure 2 The utility model provides a structure section view of the sealing plug body;

[0025] Figure 3 The utility model provides a bottom view of the sealing plug body;

[0026] Figure 4 The utility model provides a structure section view of the cover plate.

[0027] In the drawing:

[0028] 1, cover plate, 11, first perforation, 111, annular groove, 12, pole post via hole, 13, explosion-proof hole, 14, liquid injection hole,

[0029] 21, sealing plug body, 211, second perforation, 212, third perforation, 213, annular flange. DETAILED DESCRIPTION

[0030] The utility model will be further described in detail in combination with the drawings and embodiments.It can be understood that the specific embodiments described here are only used to explain the utility model and not limit the utility model.In addition, it should be noted that, for the convenience of description, only the part related to the utility model is shown in the drawing and not all structures.

[0031] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation. For ordinary skilled in the art, the above-mentioned term can be understood in the utility model the concrete meaning of the specific situation.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features is not direct contact but is through the contact between other features of them. Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0033] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "right", "left" and the like is based on the orientation or position relationship shown in the drawing, just for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the utility model. In addition, the terms "first", "second" are just used to distinguish in the description, and have no special meaning.

[0034] The technical scheme provided by the utility model is introduced below in combination with the drawings and specific embodiments.

[0035] Figure 1 It is the plan view of the cover plate provided by the embodiment; Figure 2 It is the structure section view of the sealing plug body provided by the embodiment; Figure 3 It is the bottom view of the sealing plug body provided by the embodiment; Figure 4 It is the structure section view of the cover plate provided by the embodiment.

[0036] In combination Figures 1 to 4As shown, the battery top cover provided by the embodiment is applied to a secondary battery, and mainly comprises a cover plate 1, a sealing plug and a test lead. Specifically, the cover plate 1 is provided with a first through hole 11; the sealing plug is limitingly inserted into the first through hole 11, and the sealing plug is provided with a second through hole 211 penetratingly formed thereon; one end of the test lead is arranged inside an electrode assembly, and the other end of the test lead is limitingly penetrated through the second through hole 211, the electrode assembly comprises a positive plate and a negative plate which are arranged in an insulating manner, and the one end of the test lead can be connected to the positive plate or the negative plate. Through the above battery top cover, on the basis of ensuring the sealing property of the secondary battery by the sealing plug, the test equipment can be connected through the test lead led out from the sealing plug, the test lead can be used as a reference electrode at this time, so that the potential information of the positive plate or the negative plate of the electrode assembly inside the secondary battery can be monitored in real time, and the test requirement is met.

[0037] It can be understood that the cover plate 1 of the embodiment is further provided with a pole assembly, an explosion-proof valve assembly and a liquid injection hole 14. The pole assembly comprises a positive pole terminal and a negative pole terminal, the positive pole terminal is connected to the positive plate in the electrode assembly, the negative pole terminal is connected to the negative plate in the electrode assembly, and the positive pole terminal and the negative pole terminal are fixedly installed through two pole through holes 12 formed on the cover plate 1; the explosion-proof valve assembly is fixedly installed through an explosion-proof hole 13 formed on the cover plate 1, and the explosion-proof valve assembly is provided with an explosion-proof notch, when the temperature or the air pressure inside the secondary battery exceeds a safety range, the explosion-proof notch can be broken to release the high-temperature gas, so as to avoid explosion and ensure the safety of the secondary battery in use; and the liquid injection hole 14 is used to provide a channel for injection of electrolyte. Since the pole assembly, the explosion-proof valve assembly and the liquid injection hole 14 are all conventional settings in the field, the embodiment will not be specifically described.

[0038] Specifically, the sealing plug provided by the embodiment comprises a sealing plug body 21 and a fastening structure, wherein the sealing plug body 21 is limitingly inserted into the first through hole 11 and is provided with the second through hole 211 penetratingly formed thereon, and the fastening structure is used to fixedly connect the test lead in the second through hole 211. After the battery top cover and the shell of the secondary battery are welded, the test lead is gently pulled so as not to be folded inside the battery, and then the test lead is fixed on the sealing plug body 21 through the fastening structure, so that no relative movement occurs between the test lead and the sealing plug body 21, thereby ensuring the reliability and accuracy of the measurement result.

[0039] More specifically, one of the embodiments of the embodiment is that, referring to Figure 2As shown, the third through hole 212 is provided on the sealing plug body 21, and the second through hole 211 and the third through hole 212 are arranged in a spaced manner. The fastening structure is inserted into the third through hole 212 in an interference manner, so that the part of the sealing plug body 21 between the third through hole 212 and the second through hole 211 can be deformed and expanded in the direction close to the axis of the second through hole 211, so as to clamp the test lead, thereby conveniently and quickly fixing the test lead on the sealing plug body 21. Preferably, the sealing plug body 21 is a rubber plug, a silica gel plug or other elastic plug body.

[0040] Further, in the embodiment, the third through hole 212 is a circular hole, and the fastening structure is a screw. The horizontal cross-sectional area of the threaded segment of the screw is larger than the horizontal cross-sectional area of the third through hole 212. When the threaded segment is spirally inserted into the third through hole 212, the screw can expand and deform the hole wall of the third through hole 212, so that the hole diameter is increased. On the one hand, the compression force of the annular flange 213 and the annular groove 111 can be increased, so that the annular flange 213 can be more tightly clamped in the annular groove 111. On the other hand, the second through hole 211 can be contracted, so that the test lead is tightly connected in the second through hole 211, thereby improving the connection stability of the sealing plug body 21 and the test lead.

[0041] Further, in the embodiment, referring to Figure 3 As shown, the second through hole 211 is a crescent hole, and the concave surface of the second through hole 211 is arranged opposite to the convex surface of the third through hole 212, so that the curvature of the side wall adjacent to the second through hole 211 and the third through hole 212 is consistent. The design of the special-shaped hole can effectively reduce the horizontal cross-sectional area of the second through hole 211. When the fastening structure spirally enters the third through hole 212, the test lead in the second through hole 211 can be clamped by the slight expansion and deformation of the third through hole 212. The contraction and deformation process of the second through hole 211 is more smooth, and the above-mentioned arrangement also reduces the forming difficulty of the second through hole 211, which can effectively reduce the processing and manufacturing pressure and ensure the product quality.

[0042] In the embodiment, in combination with Figure 2 、 Figure 4 As shown, the outer peripheral surface of the sealing plug body 21 is further provided with an annular flange 213, and the inner side wall of the first through hole 11 is provided with an annular groove 111. When the sealing plug body 21 is inserted into the first through hole 11, the annular flange 213 can be clamped in the annular groove 111, so that the annular flange 213 and the annular groove 111 can limit the sealing plug body 21, ensure the stable connection between the sealing plug body 21 and the cover plate 1, effectively ensure the sealing effect between the sealing plug body 21 and the cover plate 1, and effectively prevent the sealing plug body 21 from loosening due to external factors (such as temperature change, mechanical vibration, etc.), thereby further reducing the risk of error in the detection result.

[0043] Optionally, in other alternative embodiments, the sealing plug body 21 can also be designed as a T-shaped structure, the annular flange 213 includes a waist flange and a head flange, wherein the waist flange is protrudingly arranged at the middle position of the side wall of the sealing plug body 21 and is clamped in the annular groove 111, and the head flange is protrudingly arranged at one end of the side wall of the sealing plug body 21 away from the electrode assembly and is press-fitted to the upper side of the cover plate 1. The sealing plug body 21 is clamped in the first through hole 11 through the waist flange and is connected to the cover plate 1 through the head flange, so that the installation stability of the sealing plug body 21 on the cover plate 1 is better.

[0044] The embodiment also provides a battery including a shell, an electrode assembly and the battery top cover. The shell has an inner cavity capable of placing the electrode assembly, the cover plate 1 of the battery top cover is arranged at the open port of the shell, and the test lead of the battery top cover is electrically connected to the electrode assembly. Since the cover plate 1 of the battery top cover is provided with the first through hole 11, the sealing plug is sealingly inserted in the first through hole 11, and the test lead is limited in the sealing plug, at this time, the test lead can be used as a reference electrode, so that the battery can detect the positive plate or the negative plate in the electrode assembly through the test lead, and the safety and reliability of the test can be ensured.

[0045] The embodiment also provides a battery pack including the battery in the above embodiment. Since the cover plate 1 of the battery top cover is provided with the first through hole 11 for connecting the test lead to the electrode assembly and the external detection device, the battery pack can realize the separate detection of the positive plate or the negative plate in the electrode assembly through the test lead, improves the detection efficiency, and ensures the safety and reliability of the battery pack in subsequent use.

[0046] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. A battery top cover applied to a secondary battery, characterized by, The utility model relates to a battery top cover, which comprises a cover plate (1) with a first through hole (11) and a sealing plug with a second through hole (211) and a test lead. The sealing plug comprises a sealing plug body (21) and a fastening structure, the sealing plug body (21) is limitedly inserted into the first through hole (11) and has the second through hole (211) penetrating therethrough, and the fastening structure is used for fixedly connecting the test lead in the second through hole (211). The sealing plug body (21) has a third through hole (212) penetrating therethrough, the third through hole (212) and the second through hole (211) are arranged at intervals, the fastening structure is inserted into the third through hole (212) in an interference fit, so that the part of the sealing plug body (21) between the third through hole (212) and the second through hole (211) can be deformed and expanded in the direction close to the axis of the second through hole (211) to clamp the test lead. The third through hole (212) is a circular hole, the fastening structure comprises a threaded segment, the threaded segment is spirally arranged in the third through hole (212), and the horizontal cross-sectional area of the threaded segment is greater than that of the third through hole (212).

2. The battery header of claim 1, wherein, The second through hole (211) is a crescent-shaped hole, and the concave surface of the second through hole (211) is arranged opposite to the convex surface of the third through hole (212).

3. The battery cup of claim 2, wherein: The outer circumferential surface of the sealing plug body (21) is provided with an annular flange (213), the inner side wall of the first through hole (11) is provided with an annular groove (111), and the annular flange (213) is clamped in the annular groove (111).

4. The battery header of claim 3, wherein, The annular flange (213) comprises a waist flange and a head flange, the waist flange is protrudingly arranged at the middle position of the side wall of the sealing plug body (21) and is clamped in the annular groove (111), and the head flange is protrudingly arranged at one end of the side wall of the sealing plug body (21) away from the electrode assembly and is press-connected to the upper side of the cover plate (1).

5. The battery cover of claim 3, wherein, The sealing plug is a rubber plug or a silica gel plug.

6. The battery cover of claim 2, wherein, The utility model relates to a battery top cover, which comprises a cover plate (1) with a first through hole (11) and a sealing plug with a second through hole (211) and a test lead.

7. The battery header of claim 6, wherein, The utility model relates to a battery top cover, which comprises a cover plate (1) with a first through hole (11) and a sealing plug with a second through hole (211) and a test lead.

8. The battery cover of any one of claims 1-7, wherein, ​ 9. A battery characterized by ​ 10. A battery pack characterized by, ​

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