CN220774475U

CN220774475U - Battery, battery pack and vehicle

Info

Publication number: CN220774475U
Application number: CN202322351091.0U
Authority: CN
Inventors: 赵太志
Original assignee: Human Horizons Shandong Technology Co Ltd
Current assignee: Human Horizons Shandong Technology Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2024-04-12
Anticipated expiration: 2033-08-30

Abstract

The application provides a battery, group battery and vehicle, wherein, the battery includes: a housing defining a receiving chamber therein, the top of the housing being provided with a top cover; the plurality of winding cores are arranged in the accommodating cavity side by side; the reference electrode comprises a reference electrode column and a potential sensor, wherein the reference electrode column is arranged on the top cover, and the potential sensor is electrically connected with the reference electrode column and is arranged on the winding core. According to the technology of the application, the potential value of the negative electrode can be monitored in real time, so that the detection difficulty of the lithium precipitation phenomenon is reduced, and the reliability and the safety of the battery are improved.

Description

Battery, battery pack and vehicle

Technical Field

The application relates to the technical field of batteries, in particular to a battery, a battery pack and a vehicle.

Background

At present, the requirements of new energy automobile users on the charging time of a power battery are higher and higher, but the shorter the charging time is, the more easily the lithium is separated from the negative electrode of a battery core of the power battery. The lithium precipitation phenomenon refers to a phenomenon that lithium ions react irreversibly in the process of charging and discharging in the use process of the power battery, so that the lithium ions are precipitated on the negative electrode and metallic lithium is generated. This phenomenon may cause problems such as a decrease in battery capacity, an increase in internal resistance, a reduction in battery life, etc., and may even puncture the separator, resulting in a short circuit inside the battery cell, thereby causing thermal runaway. At present, the detection of the lithium precipitation phenomenon of the power battery is a difficult point in the industry, and the pain point with high detection difficulty and low detection precision exists.

Disclosure of Invention

Embodiments of the present application provide a battery, a battery pack, and a vehicle to solve or alleviate one or more technical problems in the prior art.

As an aspect of the embodiments of the present application, the embodiments of the present application provide a battery including: a housing defining a receiving chamber therein, the top of the housing being provided with a top cover; the plurality of winding cores are arranged in the accommodating cavity side by side; the reference electrode comprises a reference electrode column and a potential sensor, wherein the reference electrode column is arranged on the top cover, and the potential sensor is electrically connected with the reference electrode column and is arranged on the winding core.

In one embodiment, the top cover is provided with a mounting through hole, and the reference pole of the reference electrode is arranged in the mounting through hole in a penetrating way.

In one embodiment, the outer peripheral wall of the reference pole is provided with a receiving groove, the receiving groove is sleeved with an insulating sealing ring, and the outer peripheral wall of the insulating sealing ring is abutted against the inner peripheral wall of the mounting through hole.

In one embodiment, the potential sensor is centrally disposed within the core in the length and/or height direction of the housing and is electrically insulated from the positive and negative poles of the core.

In one embodiment, the reference electrode is a distance from the first electrode that is less than a distance from the second electrode.

In one embodiment, the reference pole includes a first end and a second end, the first end being located outside the receiving cavity, the second end being located inside the receiving cavity, and the lead of the potential sensor being welded to the second end.

In one embodiment, the first end of the reference pole is spaced from the outside surface of the cap by a distance less than or equal to the height of the first electrode and the second electrode extending out of the cap.

In one embodiment, a safety valve for releasing gas inside the battery is provided at the center of the top cover.

As another aspect of the embodiments of the present application, the embodiments of the present application provide a battery pack including:

at least one battery according to any one of the embodiments described herein;

and the battery management module is respectively and electrically connected with the first electrode, the second electrode and the reference electrode of the battery so as to determine the target potential value of the first electrode according to the acquired reference potential value of the reference electrode and the potential difference value between the first electrode and the reference electrode.

In one embodiment, a battery pack includes a plurality of batteries arranged side-by-side; wherein, in any adjacent two batteries, the first electrode of one battery and the second electrode of the other battery are electrically connected through the connecting sheet.

In one embodiment, the battery management module is configured to generate an alert prompt if the target potential value meets a threshold condition.

According to the technology of the application, through setting up the reference electrode, and the potential sensor of reference electrode sets up in the book core, through utilizing the reference potential value of reference electrode to and according to the potential difference between first electrode (i.e. negative pole) and the reference electrode, can confirm the target potential value of first electrode, thereby can judge whether the negative pole lithium precipitation phenomenon takes place for the battery according to the target potential value of first electrode. Therefore, the battery of the embodiment of the application can monitor the potential value of the negative electrode in real time, thereby reducing the detection difficulty of the lithium precipitation phenomenon and being beneficial to improving the reliability and safety of the battery.

The foregoing summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will become apparent by reference to the drawings and the following detailed description.

Drawings

In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.

Fig. 1 shows a schematic structure of a battery according to an embodiment of the present application;

FIG. 2 illustrates a top view of a battery according to an embodiment of the present application;

fig. 3 shows a side cross-sectional view of a battery according to an embodiment of the present application;

fig. 4 shows a lateral cross-sectional view of a battery according to an embodiment of the present application;

fig. 5 shows a schematic structural view of a battery pack according to an embodiment of the present application.

Reference numerals illustrate:

a battery pack 1;

a battery 100;

a housing 10; a top cover 11; a first mounting through hole 111; a second mounting through hole 112; a third mounting through hole 113;

a winding core 20; a positive electrode sheet 21; a negative electrode sheet 22; a diaphragm 23;

a first electrode 30; a first pole 31; a first tab 32;

a second electrode 40; a second pole 41; a second tab 42;

a reference electrode 50; a reference pole 51; a receiving groove 511; a potential sensor 52; a seal ring 53;

a battery management module 200; a housing 300; plug terminal set 400.

Detailed Description

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

A battery 100 according to an embodiment of the present application is described below with reference to fig. 1 to 4.

Fig. 1 shows a schematic structural view of a battery 100 according to an embodiment of the present application, and fig. 2 shows a top view of the battery 100 according to an embodiment of the present application. As shown in fig. 1 and 2, the battery 100 includes a housing 10, a plurality of winding cores 20, a first electrode 30, a second electrode 40, and a reference electrode 50. Specifically, the interior of the housing 10 defines a receiving chamber, and the top of the housing 10 is provided with a top cover 11. The plurality of winding cores 20 are arranged side by side in the accommodating chamber. The reference electrode 50 includes a reference electrode post 51 and a potential sensor 52, the reference electrode post 51 is disposed on the top cover 11, and the potential sensor 52 is electrically connected to the reference electrode post 51 and disposed on the winding core 20.

In the embodiment of the present application, the battery 100 may be a lithium ion battery 100. The winding core 20 includes a positive electrode sheet 21, a negative electrode sheet 22, and a separator 23, the separator 23 is disposed between the positive electrode sheet 21 and the negative electrode sheet 22, and the positive electrode sheet 21, the separator 23, and the negative electrode sheet 22 are assembled into a cylindrical or square winding core 20 by winding. The material of the positive electrode sheet 21 may include at least one of lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium manganese oxide, lithium nickel cobalt aluminate, and lithium pinching manganese oxide, the material of the negative electrode sheet 22 may include at least one of graphite, silicic acid material, silicon-oxygen-carbon material, lithium titanate, metal oxide, and metal lithium, and the material of the separator 23 may include at least one of polyethylene, polypropylene, and aramid.

Illustratively, the first electrode 30 may be the cathode (i.e., the positive electrode) of the battery 100, the first electrode 30 includes a first tab 31 and a first tab 32, and the first tab 32 is electrically connected with the positive electrode tab 21 of the jellyroll 20. The second electrode 40 may be an anode (i.e., a cathode) of the battery 100, the second electrode 40 includes a second post 41 and a second tab 42, and the second electrode 40 is electrically connected with the negative electrode tab 22 of the jelly roll 20. The first electrode 30, the second electrode 40 and the reference electrode 50 are arranged side by side and at intervals in the length direction of the housing 10, wherein the reference electrode 50 is arranged between the first electrode 30 and the second electrode 40. More specifically, the first electrode 30, the second electrode 40, and the reference electrode 50 may also be centrally disposed in the width direction of the housing 10. The first electrode 31 of the first electrode 30, the second electrode 41 of the second electrode 40, and the reference electrode 51 of the reference electrode 50 are all disposed on the top cover 11 of the housing 10.

In some examples, the material of the potential sensor 52 may be a material with stable potential and high chemical stability, such as an antimony lithium alloy.

It is understood that the reference electrode 50 can be used as a reference and comparison electrode when measuring the potential value of the first electrode 30 or the second electrode 40, the first electrode 30 or the second electrode 40 to be measured and the reference electrode 50 with a precisely known potential value form a battery, and the potential value of the first electrode 30 or the second electrode 40 to be measured can be calculated by measuring the electromotive force value of the battery.

It should be noted that, in the embodiment of the present application, the number of the reference electrodes 50 may be set to one or more. The specific structure of reference electrode 50 can take any configuration known to those skilled in the art or to be known in the future, and embodiments of the present application are not specifically limited thereto.

For example, the number of reference electrodes 50 may be set to one, the reference electrodes 50 may include a lithium sheet, a negative electrode tab, and an insulating separator 23, and the reference electrodes 50 may be disposed between the separators 23 stacked after winding of the winding core 20.

According to the battery 100 of the embodiment of the application, by providing the reference electrode 50 and the potential sensor 52 of the reference electrode 50 is provided on the winding core 20, the target potential value of the first electrode 30 can be determined by using the reference potential value of the reference electrode 50 and according to the potential difference between the first electrode 30 (i.e. the negative electrode) and the reference electrode 50, so that it can be determined whether the negative electrode lithium precipitation phenomenon occurs in the battery 100 according to the target potential value of the first electrode 30. Therefore, the battery 100 of the embodiment of the application can monitor the potential value of the negative electrode in real time, thereby reducing the detection difficulty of the lithium precipitation phenomenon and being beneficial to improving the reliability and safety of the battery 100.

In one embodiment, as shown in fig. 1, the top cover 11 is provided with a mounting through hole, and the reference post 51 of the reference electrode 50 is inserted into the mounting through hole.

Illustratively, the top cover 11 is provided with a first mounting through hole 111, a second mounting through hole 112 and a third mounting through hole 113 which are provided therethrough, and the first mounting through hole 111, the second mounting through hole 112 and the third mounting through hole 113 are provided side by side and at intervals on the top cover 11. Wherein the first mounting through hole 111 and the second mounting through hole 112 are used for mounting the first post 31 of the first electrode 30 and the second post 41 of the second electrode 40, respectively, and the third mounting through hole 113 is used for mounting the reference post 51 of the reference electrode 50.

Alternatively, as shown in fig. 1, the outer peripheral wall of the reference pole 51 is provided with a receiving groove 511, the receiving groove 511 is sleeved with an insulating seal ring 53, and the outer peripheral wall of the insulating seal ring 53 abuts against the inner peripheral wall of the mounting through hole.

In the embodiment of the present application, the insulating seal ring 53 may be made of any material having insulating properties, for example, rubber, polytetrafluoroethylene, polyurethane, etc., which is not particularly limited in the embodiment of the present application.

Illustratively, the thickness (i.e., the dimension from the inner side surface to the outer side surface) of the seal ring 53 is greater than the distance between the inner peripheral wall of the accommodation groove 511 of the reference pole 51 and the inner peripheral wall of the mounting through hole, so that the insulating seal ring 53 is in a compressed state between the inner peripheral wall of the accommodation groove 511 and the inner peripheral wall of the mounting through hole, thereby enhancing the sealing effect. More specifically, the outer peripheral wall of the insulating seal ring 53 is provided with an annular clamping groove, and the outer Zhou Yanka of the mounting through hole is arranged in the annular clamping groove, so that the fixing effect of the insulating seal ring 53 between the reference pole 51 and the mounting through hole is improved.

In one embodiment, as shown in fig. 3 and 4, the potential sensor 52 is centrally disposed within the interior of the winding core 20 in the length direction and/or the height direction of the housing 10.

Preferably, the potential sensor 52 is disposed at the center of the accommodation chamber in the longitudinal direction, the height direction, and the width direction of the housing 10. The winding core 20 comprises a positive plate 21, a negative plate 22 and a diaphragm 23, wherein the diaphragm is coated on the outer surfaces of the positive plate 21 and the negative plate 22 and is wound to form a first interlayer, a second interlayer, a third interlayer and a fourth interlayer which are arranged in a laminated manner. Wherein, first interlayer is located the one side of keeping away from negative pole piece 22 of positive pole piece 21, and second interlayer and third interlayer are located between positive pole piece 21 and negative pole piece 22, and the fourth interlayer is located the one side of keeping away from positive pole piece 21 of negative pole piece 22. The potential sensor 52 is centrally disposed between the second barrier and the third barrier.

With the above embodiment, the detection accuracy of the reference potential value detected by the reference electrode 50 can be improved, and the target potential value of the first electrode 30 (i.e., the negative electrode) can be detected more accurately.

Alternatively, as shown in fig. 2, reference electrode 50 is spaced from first electrode 30 less than reference electrode 50 is spaced from second electrode 40.

Illustratively, the reference electrode 50 is positioned between the first electrode 30 and the second electrode 40, and the first electrode 30, the reference electrode 50, and the second electrode 40 are arranged side by side and at intervals in the length direction of the top cover 11. Wherein the distance between reference electrode 50 and first electrode 30 is less than the distance between reference electrode 50 and second electrode 40.

In one embodiment, as shown in fig. 1, the reference pole 51 includes a first end and a second end, the first end is located outside the receiving cavity, the second end is located inside the receiving cavity, and the lead of the potential sensor 52 is welded to the second end.

Illustratively, the electrical connection between the lead of the potential sensor 52 and the second end of the reference pole 51 may be made using any one of resistance welding, ultrasonic welding, and laser welding.

Alternatively, as shown in fig. 1, the first end of the reference pole 51 is spaced from the outer side surface of the top cover 11 by a distance less than or equal to the height by which the first electrode 30 and the second electrode 40 protrude from the top cover 11.

Illustratively, the heights of the first electrode post 31 of the first electrode 30 and the second electrode post 41 of the second electrode 40 protruding from the top cover 11 are 4 to 6mm, respectively, and the first end of the reference electrode post 51 may be spaced from the outer side surface of the top cover 11 by 1 to 3mm such that the first end of the reference electrode post 51 is spaced from the outer side surface of the top cover 11 by less than the heights of the first electrode 30 and the second electrode 40 protruding from the top cover 11.

By this arrangement, the occupation of the external space of the battery 100 by the reference electrode post 51 can be reduced, thereby contributing to a reduction in the external dimensions of the battery 100.

In one embodiment, as shown in fig. 1, a safety valve is provided at the center of the top cover 11 for opening or closing the accommodating chamber.

The safety valve may specifically be an electromagnetic valve, which is electrically connected to the battery management module 200 of the battery pack 1, where the battery management module 200 collects parameters such as temperature and pressure inside the battery 100, and the parameters such as temperature and pressure inside the battery 100 reach preset conditions, and the electromagnetic valve is controlled to be opened to release high-pressure gas inside the battery 100 to the outside, so as to avoid explosion of the battery 100 caused by high temperature or high pressure, thereby improving safety performance of the battery 100.

The embodiment of the application also provides a battery pack 1. Fig. 5 shows a schematic structural view of the battery pack 1 of the embodiment of the present application. As shown in fig. 5, the battery pack 1 includes at least one battery 100 of the above-described embodiments of the present application and a battery management module 200. Specifically, the battery management module 200 is electrically connected to the first electrode 30, the second electrode 40, and the reference electrode 50 of the battery 100, respectively, to determine a target potential value of the first electrode 30 according to the acquired reference potential value of the reference electrode 50 and the potential difference between the first electrode 30 and the reference electrode 50.

Illustratively, the battery pack 1 further includes a housing 300. The plurality of batteries 100 are arranged side by side in the longitudinal direction of the casing 300 inside the casing 300, and the positive and negative electrodes of any adjacent two batteries 100 are correspondingly arranged and are also arranged side by side in the longitudinal direction of the casing 300. The first electrode 30, the second electrode 40, and the reference electrode 50 of each battery 100 are electrically connected to the socket terminal set 400 through sampling harnesses, respectively, and the socket terminal set 400 is electrically connected to the battery management module 200 (BMS in the drawing).

It is understood that the battery management module 200 can determine the target potential values of the first electrode 30 and the negative electrode of the battery 100 according to the collected potential difference between the reference electrode 50 and the first electrode 30 and according to the reference potential value of the reference electrode 50.

Optionally, the battery management module 200 is configured to generate an alert prompt if the target potential value meets a threshold condition.

For example, the alarm prompt is used for indicating other vehicle-mounted devices such as a vehicle-mounted screen of the vehicle to remind a user that the battery pack 1 may or has lithium precipitation phenomenon in the form of pattern display, sound, light and the like, thereby playing a role of reminding. In the embodiment of the present application, a person skilled in the art may set a corresponding threshold condition according to an actual situation, which is not specifically limited in the embodiment of the present application.

In the specific example of the present application, the plurality of batteries 100 included in the battery pack 1 may be all the batteries 100 according to the above-described embodiment of the present application, or some of the plurality of batteries 100 may be the batteries 100 according to the above-described embodiment of the present application.

For example, among the plurality of batteries 100 included in the battery pack 1, the battery 100 located at the end position and the middle position is likely to cause a lithium precipitation phenomenon. In view of this, as shown in fig. 5, among the plurality of batteries 100 included in the battery pack 1, the batteries 100 positioned at both ends and at the middle in the longitudinal direction of the case 300 may employ the batteries 100 of the embodiments described above.

In one embodiment, the battery pack 1 includes a plurality of batteries 100, the plurality of batteries 100 being arranged side by side; in any two adjacent cells 100, the first electrode 30 of one cell 100 is electrically connected to the second electrode 40 of the other cell 100 via a connecting sheet.

By the arrangement, a plurality of batteries 100 are sequentially connected in series, so that the battery pack 1 is integrally formed, and the power requirement of a vehicle can be met.

The embodiment of the present application also provides a vehicle including the battery pack 1 of the above embodiment of the present application.

The battery pack 1 and other components of the vehicle of the above embodiment may be applied to various technical solutions now and in the future known to those skilled in the art, and will not be described in detail herein.

In the description of the present specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the present application. The components and arrangements of specific examples are described above in order to simplify the disclosure of this application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or substitutions within the technical scope of the present application, and these should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery, comprising:

a housing defining a receiving cavity therein, the top of the housing being provided with a top cover;

the winding core is arranged in the accommodating cavity;

the reference electrode comprises a reference electrode column and a potential sensor, wherein the reference electrode column is arranged on the top cover, and the potential sensor is electrically connected with the reference electrode column and is arranged on the winding core.

2. The battery of claim 1, wherein the top cover is provided with a mounting through hole, and the reference post of the reference electrode is inserted into the mounting through hole.

3. The battery according to claim 2, wherein the outer peripheral wall of the reference pole is provided with a receiving groove, the receiving groove is sleeved with an insulating sealing ring, and the outer peripheral wall of the insulating sealing ring is abutted against the inner peripheral wall of the mounting through hole.

4. The battery according to claim 1, wherein the potential sensor is provided centrally inside the winding core in a length direction and/or a height direction of the case, and is electrically insulated from positive and negative electrodes of the winding core.

5. The cell of claim 3, wherein the reference electrode is a distance from the first electrode that is less than a distance from the reference electrode to the second electrode.

6. The battery of claim 1, wherein the reference post comprises a first end and a second end, the first end being located outside the receiving cavity, the second end being located inside the receiving cavity, and the lead of the potential sensor being welded to the second end.

7. The battery of claim 6, wherein a distance between the first end of the reference pole and the outside surface of the top cap is less than or equal to a height by which the first electrode and the second electrode protrude from the top cap.

8. The battery according to claim 1, wherein the top cover is provided at a central position thereof with a safety valve for releasing gas.

9. A battery pack, comprising:

at least one battery according to any one of claims 1 to 8;

10. The battery pack of claim 9, wherein the battery pack comprises a plurality of cells, a plurality of the cells being arranged side-by-side; wherein, in any adjacent two batteries, the first electrode of one battery and the second electrode of the other battery are electrically connected through the connecting sheet.

11. The battery pack of claim 9, wherein the battery management module is configured to generate an alert prompt if the target potential value meets a threshold condition.

12. A vehicle comprising the battery pack according to any one of claims 9 to 11.