CN219067006U - Battery, battery pack and electric equipment - Google Patents

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

Batteries, Battery Packs and Power Consumers

technical field

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

Background technique

Lithium-ion batteries have the advantages of high specific capacity, low self-discharge rate, and no memory effect. Since their commercialization in 1990, they have been widely used in portable electronic devices, electric vehicles, and large-scale energy storage facilities. With the iteration of energy storage technology and the improvement of market demand for energy storage, lithium-ion batteries are developing in the direction of fast charging, high energy density, high safety, low cost, and wide temperature range. The conventional graphite negative electrode battery system has problems such as structural damage, interface degradation, and lithium precipitation during the cycle, and it is difficult to meet the requirements of long-term high-rate cycles.

The conventional lamination method is to arrange the positive electrode sheet with double-sided coating of positive electrode material on the current collector and the negative electrode sheet with double-sided coating of negative electrode material on the current collector in the order of positive-negative-positive...negative, and place the positive electrode The internal parallel structure formed by welding the ear and the negative electrode ear respectively, this method can maximize the use of the capacity of the electrode active material, but the output voltage of the electrode group is relatively low.

Utility model content

The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a battery, which can overcome the defects of the low-voltage platform and increase the output voltage.

The utility model also aims to provide a battery pack to apply the above-mentioned battery.

The utility model also aims to provide an electric device to apply the above-mentioned battery pack.

The battery according to the embodiment of the utility model includes: a positive electrode sheet, the two ends of the positive electrode sheet are positive electrodes; a negative electrode sheet, the two ends of the negative electrode sheet are negative electrodes; a bipolar sheet, one end of the bipolar sheet is a positive electrode , the other end is a negative electrode; wherein, the positive electrode sheet, the negative electrode sheet and the bipolar sheet are stacked, and one or more of the bipolar sheets are arranged between any adjacent positive electrode sheets and the negative electrode sheets pole piece, the positive pole of the bipolar piece corresponds to the negative pole piece, and the negative pole of the bipolar piece corresponds to the positive pole piece.

According to the battery of the embodiment of the utility model, the output voltage of the electrode group can be increased by providing a bipolar sheet between the positive electrode sheet and the negative electrode sheet, which can overcome the defect of the low-voltage platform, thereby expanding the application range to the field of high-voltage fast charging.

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

In some embodiments, the material of the current collector of the positive electrode sheet, the negative electrode sheet and the bipolar sheet includes aluminum or copper.

In some embodiments, the electrolyte used in the battery includes carbonate electrolyte.

In some embodiments, the tabs of the positive electrode sheet and/or the negative electrode sheet are arranged on the same side or on different sides.

In some embodiments, when multiple bipolar sheets are provided between any adjacent positive electrode sheet and negative electrode sheet, the multiple bipolar sheets are connected in series in sequence.

A battery pack according to an embodiment of the present invention includes the aforementioned battery.

According to the battery pack of the embodiment of the present invention, the battery has a relatively high output voltage.

In some embodiments, the battery is a square battery prepared by stacking or winding process.

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

The electrical equipment according to the embodiment of the present invention includes the aforementioned battery pack.

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

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic diagram of the battery of the utility model embodiment;

Fig. 2 is a schematic circuit diagram of the series and parallel connection of the pole pieces in the battery according to the embodiment of the present invention.

Reference signs:

100. battery;

10. Positive pole piece; 20. Negative pole piece; 30. Bipolar piece; 1a, positive pole; 1b, negative pole.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying Any device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features, which are used to describe the features differently, without order or importance.

In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Referring to FIG. 1 , a battery 100 according to an embodiment of the present invention will be described below.

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

Both ends of the positive electrode sheet 10 are positive electrodes 1a. Both ends of the negative electrode sheet 20 are negative electrodes 1b. One end of the bipolar sheet 30 is the positive electrode 1a, and the other end is the negative electrode 1b. Among them, the positive electrode sheet 10, the negative electrode sheet 20 and the bipolar sheet 30 are stacked and arranged, and one or more bipolar sheets 30 are arranged between any adjacent positive electrode sheet 10 and negative electrode sheet 20, and the positive electrode 1a of the bipolar sheet 30 is connected to the negative electrode The sheet 20 corresponds, 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 present utility model, the output voltage of the pole group can be improved by providing a bipolar sheet 30 between the positive electrode sheet 10 and the negative electrode sheet 20, which can overcome the defect of the low-voltage platform, thereby expanding the application range to high-voltage fast charging field.

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 to say, 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 material of the positive electrode sheet 10 , the negative electrode sheet 20 and the bipolar sheet 30 is lithium titanate. Alternatively, 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, and meanwhile, the negative electrode material may be lithium titanate.

As shown in FIG. 1 , the positive electrode sheet 10 includes a current collector 1c and a positive electrode active material coated on both ends of the current collector 1c. The negative electrode sheet 20 includes a current collector 1c and a negative electrode active material coated on both ends of the current collector 1c. The bipolar sheet 30 includes a current collector 1c, a positive active material coated on one end of the current collector 1c, and a negative active material coated on the other end of the current collector 1c. That is to say, the above-mentioned negative electrode active material is lithium titanate, and the positive electrode active material is lithium iron phosphate.

Lithium titanate is a "zero-strain" electrode material that basically has no system changes during the lithium ion deintercalation process. At the same time, no SEI film is formed on the surface, which avoids the degradation of the battery interface during the cycle and has good cycle stability. and security. 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 lithium ion diffusion coefficient can reach 2×10 ^-8 cm ² s ^{- 1} (25°C), which is much higher than that of graphite anode, so it has a high potential for large-scale application in the field of fast charging technology.

Lithium iron phosphate cathode material has the advantages of stable voltage platform, high safety, and long cycle life. Lithium titanate|lithium iron phosphate system can achieve 20,000 charge and discharge cycles at 10C-5C, basically no capacity fading, and excellent fast charge cycle performance. The battery 100 based on lithium titanate and lithium iron phosphate is favorable for application in the field of high-voltage energy storage.

In some embodiments, the material of the current collector 1 c of the positive electrode sheet 10 , the negative electrode sheet 20 and the bipolar sheet 30 includes aluminum or copper. That is to say, the current collector 1c may be an aluminum current collector or a copper current collector. Wherein, when the current collector 1c is an aluminum current collector, it has lower cost and lower density.

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

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

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

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

For example, the tabs of the positive electrode sheet 10 and the tabs of the negative electrode sheet 20 are arranged on the same side, or the tabs of the positive electrode sheet 10 and the tabs of the negative electrode sheet 20 are arranged on different sides.

In some embodiments, as shown in FIG. 1 , there is only one bipolar sheet 30 between any adjacent positive electrode sheet 10 and negative electrode sheet 20 . As shown in Figure 2 (C in the figure represents the electric quantity, V represents the voltage), in the case of lithium titanate and lithium iron phosphate unipolar group, the output voltage can be increased from 1.7V to 3.4V by using this method, and the pole group The output voltage is doubled.

In some embodiments, when there are multiple bipolar sheets 30 between any adjacent positive electrode sheet 10 and negative electrode sheet 20, the multiple bipolar sheets 30 are connected in series sequentially (see FIG. 2 ). The output voltage of the battery 100 is proportional to the number of laminated layers. The larger the number of bipolar plates 30, the higher voltage electrode group can be realized. Combined with the fast charging and long life characteristics of the lithium titanate and lithium iron phosphate system itself, it is expected to Build a high-voltage fast-charging energy storage device with great practical potential.

Optionally, there are three or four bipolar sheets 30 between any adjacent positive electrode sheet 10 and negative electrode sheet 20 . The electrochemical window of the current lithium-ion battery electrolyte is usually lower than 5V, and the bipolar sheet 30 between any adjacent positive electrode sheet 10 and negative electrode sheet 20 is set to three or four to ensure that the actual requirements are met, so that the electrolyte in a stable voltage range.

The battery pack according to the embodiment of the present invention includes the aforementioned battery 100 .

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

According to the battery pack of the embodiment of the present invention, the battery 100 has a higher output voltage.

In some embodiments, the battery is a prismatic battery prepared by lamination or winding process.

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

The electric device according to the embodiment of the present utility model includes the aforementioned battery pack.

Wherein, the electric device may refer to a vehicle, a drone, or a robot.

In the description of this specification, descriptions with reference to the terms "some embodiments", "optionally", "further" or "some examples" mean that specific features, structures, materials or Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications, the scope of the present invention is defined by the claims and their equivalents.

Claims (10)

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.

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