CN219067006U

CN219067006U - Battery, battery pack and electric equipment

Info

Publication number: CN219067006U
Application number: CN202223356919.3U
Authority: CN
Inventors: 耿守贤; 苏树发; 吴江雪; 邵梦
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-05-23
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a battery, a battery pack and electric equipment, wherein the battery comprises: the positive plate, both ends of positive plate are the positive pole; a negative plate, two ends of which are negative electrodes; the double-pole piece, one end of the double-pole piece is a positive pole, and the other end is a negative pole; the positive plate, the negative plate and the bipolar plates are stacked, one or more bipolar plates are arranged between any adjacent positive plate and negative plate, the positive electrode of the bipolar plate corresponds to the negative plate, and the negative electrode of the bipolar plate corresponds to the positive plate. According to the battery provided by the embodiment of the utility model, the output voltage of the pole group can be improved by arranging the double-pole piece between the positive pole piece and the negative pole piece, the defect of a low-voltage platform can be overcome, and the application range is expanded to the field of high-voltage quick charge.

Description

Battery, battery pack and electric equipment

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery, a battery pack and electric equipment.

Background

The lithium ion battery has the advantages of high specific capacity, small self-discharge rate, no memory effect and the like, and has been widely applied to portable electronic equipment, electric automobiles, large energy storage facilities and the like since commercialization in 1990. Along with the iteration of energy storage technology and the improvement of market energy storage demands, the lithium ion battery is developing towards fast charge, high energy density, high safety, low cost and wide temperature range. The conventional graphite negative electrode battery system has the problems of structural damage, interface degradation, lithium precipitation and the like in the circulating process, and is difficult to meet the requirement of long-term high-rate circulation.

The conventional lamination method adopts a structure in which positive plates coated with positive electrode materials on both sides of a current collector and negative plates coated with negative electrode materials on both sides of the current collector are arranged in a positive-negative-positive … negative sequence, and positive lugs and negative lugs are respectively welded to form an internal parallel connection.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery that overcomes the drawbacks of the low-voltage stage and increases the output voltage.

The utility model also aims to provide a battery pack for applying the battery.

The utility model also aims to provide electric equipment so as to apply the battery pack.

A battery according to an embodiment of the present utility model includes: the positive plate, both ends of the said positive plate are the positive pole; the negative electrode plate, both ends of the negative electrode plate are negative electrodes; the double-pole piece is characterized by comprising a positive electrode at one end and a negative electrode at the other end; the positive plate, the negative plate and the bipolar plates are stacked, one or more bipolar plates are arranged between any adjacent positive plates and negative plates, the positive electrodes of the bipolar plates correspond to the negative plates, and the negative electrodes of the bipolar plates correspond to the positive plates.

According to the battery provided by the embodiment of the utility model, the output voltage of the pole group can be improved by arranging the double pole pieces between the positive pole piece and the negative pole piece, so that the defect of a low-voltage platform can be overcome, and the application range is expanded to the field of high-voltage quick charge.

In some embodiments, the positive electrode sheet, the negative electrode sheet, and the positive electrode material of the double electrode sheet are lithium iron phosphate, and/or the negative electrode material is lithium titanate.

In some embodiments, the materials of the positive electrode sheet, the negative electrode sheet, and the current collector of the double electrode sheet include aluminum or copper.

In some embodiments, the electrolyte used by the battery includes a carbonate electrolyte.

In some embodiments, the tabs of the positive plate and/or the negative plate are disposed on the same side or different sides.

In some embodiments, when a plurality of bipolar plates are disposed between any adjacent positive electrode plates and negative electrode plates, the plurality of bipolar plates are sequentially connected in series.

A battery pack according to an embodiment of the present utility model includes the battery described above.

According to the battery pack provided by the embodiment of the utility model, the battery has higher output voltage.

In some embodiments, the battery is a prismatic battery made by lamination or winding processes.

In some embodiments, the battery is a cylindrical battery prepared by a winding process.

The electric equipment comprises the battery pack.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic view of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of series and parallel circuits of pole pieces in a battery according to an embodiment of the utility model.

Reference numerals:

100. a battery;

10. a positive plate; 20. a negative electrode sheet; 30. a double pole piece; 1a, a positive electrode; 1b, a negative electrode.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly, for distinguishing between the descriptive features, and not sequentially, and not lightly.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

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

As shown in fig. 1, a battery 100 according to an embodiment of the present utility model includes: positive electrode sheet 10, negative electrode sheet 20, and bipolar sheet 30.

The positive electrode sheet 10 has positive electrodes 1a at both ends. The negative electrode sheet 20 has negative electrodes 1b at both ends. One end of the bipolar plate 30 is a positive electrode 1a, and the other end is a negative electrode 1b. The positive electrode sheet 10, the negative electrode sheet 20 and the bipolar sheet 30 are stacked, one or more bipolar sheets 30 are arranged between any adjacent positive electrode sheet 10 and negative electrode sheet 20, the positive electrode 1a of the bipolar sheet 30 corresponds to the negative electrode sheet 20, and the negative electrode 1b of the bipolar sheet 30 corresponds to the positive electrode sheet 10.

According to the battery 100 of the embodiment of the utility model, the output voltage of the electrode group can be improved by arranging the double-pole piece 30 between the positive pole piece 10 and the negative pole piece 20, and the defect of a low-voltage platform can be overcome, so that the application range is expanded to the field of high-voltage quick charge.

In some embodiments, the positive electrode material of the positive electrode sheet 10, the negative electrode sheet 20, and the bipolar sheet 30 is lithium iron phosphate, and/or the negative electrode material is lithium titanate. That is, the positive electrode material of the positive electrode sheet 10, the negative electrode sheet 20, and the bipolar sheet 30 may be lithium iron phosphate. Alternatively, the negative electrode materials of the positive electrode sheet 10, the negative electrode sheet 20, and the bipolar sheet 30 are lithium titanate. Alternatively, the positive electrode materials of the positive electrode sheet 10, the negative electrode sheet 20, and the bipolar sheet 30 may be lithium iron phosphate, and the negative electrode material may be lithium titanate.

As shown in fig. 1, the positive electrode sheet 10 includes a current collector 1c and positive electrode active materials coated on both end surfaces of the current collector 1 c. The negative electrode sheet 20 includes a current collector 1c and a negative electrode active material coated on both end surfaces of the current collector 1 c. The bipolar plate 30 includes a current collector 1c, a positive electrode active material coated on one end surface of the current collector 1c, and a negative electrode active material coated on the other end surface of the current collector 1 c. That is, the negative electrode active material is lithium titanate, and the positive electrode active material is lithium iron phosphate.

The lithium titanate is a zero-strain electrode material which basically has no system change in the lithium ion deintercalation process, and meanwhile, the SEI film can not be generated on the surface of the lithium titanate, so that the problem of battery interface degradation in the circulation process is avoided, and the lithium titanate has good circulation stability and safety. The oxidation-reduction potential of lithium titanate is 1.55V (vs. Li/Li+), which satisfies the condition of using lower-cost aluminum as the negative electrode current collector, and the diffusion coefficient of lithium ions can reach 2 multiplied by 10 ^-8 cm ² s ^-1 (25 ℃) is far higher than a graphite cathode, so the lithium ion battery has high large-scale application potential in the technical field of quick charge.

The lithium iron phosphate anode material has the advantages of stable voltage platform, high safety, long cycle life and the like. The lithium titanate/lithium iron phosphate system can realize 20000 charge-discharge cycles of 10C-5C, basically has no capacity attenuation and has extremely excellent rapid charge-cycle performance. The lithium titanate and lithium iron phosphate based battery 100 is advantageous for applications in the high-voltage energy storage field.

In some embodiments, the materials of the current collectors 1c of the positive electrode tab 10, the negative electrode tab 20, and the bipolar tab 30 include aluminum or copper. That is, the current collector 1c may be an aluminum current collector or a copper current collector. Wherein the current collector 1c is an aluminum current collector, has lower cost and lower density.

In some embodiments, the electrolyte used in battery 100 includes a carbonate electrolyte. The use of carbonate electrolyte has lower cost.

In some embodiments, the tabs of the positive electrode tab 10 and/or the negative electrode tab 20 are disposed on the same side or on different sides.

For example, the tabs of the positive electrode sheet 10 are disposed on the same side, or the tabs of the positive electrode sheet 10 are disposed on different sides.

For example, the tabs of the negative electrode sheet 20 are disposed on the same side, or the tabs of the negative electrode sheet 20 are disposed on different sides.

For example, the tab of the positive electrode tab 10 and the tab of the negative electrode tab 20 are disposed on the same side, or the tab of the positive electrode tab 10 and the tab of the negative electrode tab 20 are disposed on different sides.

In some embodiments, as shown in fig. 1, the bipolar plate 30 between any adjacent positive and negative electrode plates 10, 20 is one. As shown in fig. 2 (C represents the electric quantity, and V represents the voltage), in the case of the lithium titanate and lithium iron phosphate monopolar group, the output voltage can be raised from 1.7V to 3.4V in this way, and the output voltage of the electrode group can be doubled.

In some embodiments, when there are a plurality of bipolar plates 30 between any adjacent positive electrode plate 10 and negative electrode plate 20, the plurality of bipolar plates 30 are sequentially connected in series (see fig. 2). The output voltage of the battery 100 is in direct proportion to the number of lamination layers, the more the number of the bipolar plates 30 is, the higher voltage of the electrode group can be realized, and the high-voltage fast-charging energy storage device with great practical potential is expected to be constructed by combining the characteristics of fast charging and long service life of a lithium titanate and lithium iron phosphate system.

Alternatively, the number of the bipolar plates 30 between any adjacent positive electrode plate 10 and negative electrode plate 20 is three or four. The electrochemical window of the current lithium ion battery electrolyte is usually lower than 5V, and three or four bipolar plates 30 between any adjacent positive plate 10 and negative plate 20 are arranged to ensure that the actual requirements are met, so that the electrolyte is in a stable voltage interval.

A battery pack according to an embodiment of the present utility model includes the foregoing battery 100.

It should be noted that other components and operations of the battery pack are known to those skilled in the art, and will not be described in detail herein.

According to the battery pack of the embodiment of the present utility model, the battery 100 has a high output voltage by adopting the battery pack.

The electric equipment comprises the battery pack.

Wherein, the electric equipment can be a vehicle, an unmanned plane or a robot, etc.

In the description of the present specification, reference to the terms "some embodiments," "optionally," "further," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, comprising:

the positive electrode plate (10), two ends of the positive electrode plate (10) are positive electrodes (1 a);

a negative electrode plate (20), wherein both ends of the negative electrode plate (20) are negative electrodes (1 b);

a bipolar plate (30), wherein one end of the bipolar plate (30) is a positive electrode (1 a), and the other end is a negative electrode (1 b);

the positive plate (10), the negative plate (20) and the bipolar plate (30) are stacked, one or more bipolar plates (30) are arranged between any adjacent positive plates (10) and negative plates (20), positive electrodes (1 a) of the bipolar plates (30) correspond to the negative plates (20), and negative electrodes (1 b) of the bipolar plates (30) correspond to the positive plates (10).

2. The battery according to claim 1, wherein the positive electrode material of the positive electrode sheet (10), the negative electrode sheet (20) and the bipolar sheet (30) is lithium iron phosphate;

and/or the negative electrode material is lithium titanate.

3. The battery according to claim 2, wherein the materials of the positive electrode sheet (10), the negative electrode sheet (20) and the current collector (1 c) of the bipolar sheet (30) include aluminum or copper.

4. The battery according to claim 2, characterized in that the electrolyte used for the battery (100) comprises a carbonate electrolyte.

5. The battery according to claim 1, characterized in that the tabs of the positive electrode tab (10) and/or the negative electrode tab (20) are arranged on the same side or on different sides.

6. The battery according to claim 1, wherein when a plurality of bipolar plates (30) are provided between any adjacent positive electrode plate (10) and negative electrode plate (20), the plurality of bipolar plates (30) are connected in series in order.

7. A battery pack comprising the battery according to any one of claims 1 to 6.

8. The battery pack of claim 7, wherein the battery is a prismatic battery made by lamination or winding process.

9. The battery pack of claim 7, wherein the battery is a cylindrical battery prepared by a winding process.

10. A powered device comprising a battery pack as claimed in any one of claims 7 to 9.