CN117859224A

CN117859224A - Battery cell, battery and terminal equipment

Info

Publication number: CN117859224A
Application number: CN202280004849.9A
Authority: CN
Inventors: 王硕
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2024-04-09
Also published as: WO2023221006A1

Abstract

An electric core, a battery with the electric core and a terminal device. The battery cell (100) comprises a plurality of pole pieces, the pole pieces are stacked along the preset direction, the battery cell (100) is provided with a first surface (11) and a second surface (12) which are oppositely arranged along the preset direction, at least one of the first surface (11) and the second surface (12) is provided with an avoiding part (3), and the space utilization rate of the terminal equipment, the capacity of the battery and the stability of the battery cell are improved.

Description

Battery cell, battery and terminal equipment

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery cell, a battery with the battery cell and terminal equipment.

Background

In the related art, the surfaces of the battery cells in the thickness direction are all flat surfaces, and installation interference exists between related components and the battery cells at the positions of the terminal equipment for placing the battery cells. The overall thickness of the battery is generally reduced by reducing the number of pole pieces to avoid interference between the battery cells and related components, but reducing the number of pole pieces reduces the battery capacity, and the terminal equipment has the problem of low space utilization of the accommodating cavity.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present disclosure provide a cell. The battery cell has the advantages of high battery capacity and high space utilization rate.

Embodiments of the present disclosure also provide a battery.

The embodiment of the disclosure also provides a terminal device.

The battery cell of this disclosed embodiment, including a plurality of pole pieces, a plurality of the pole pieces is along predetermineeing the range upon range of setting of direction, a plurality of the pole pieces include positive plate and negative plate, the positive plate with the negative plate is in the direction of predetermineeing is arranged alternately, the battery cell has the first surface and the second surface of predetermineeing the relative setting in the direction, first surface with at least one of second surface has dodges the portion.

According to the battery cell disclosed by the embodiment of the disclosure, the avoidance part is arranged on the surface of the battery cell in the preset direction, so that the number of pole pieces can be reduced, and interference between the battery cell and related components can be avoided. Therefore, the battery cell of the embodiment of the disclosure has the advantage of high capacity. In addition, because the number of pole pieces is not reduced, the battery cell can occupy the space for accommodating the battery cell as much as possible, the battery cell has the advantage of improving the space utilization rate of the accommodating cavity, the battery cell can be prevented from shaking in the accommodating cavity to a certain extent, and the stability of the battery cell is improved.

Therefore, the terminal equipment of the embodiment of the disclosure has the advantages of good stability of the structure of the battery cell, high space utilization rate and high capacity of the battery.

In some embodiments, at least some of the plurality of pole pieces are provided with notches that are opposed and communicate to form the relief.

In some embodiments, each of the positive and negative electrode sheets has a plurality, and a total area of the plurality of positive electrode sheets having the indentations is greater than a total area of the plurality of negative electrode sheets having the indentations.

In some embodiments, the notch is provided in a central region of the pole piece.

In some embodiments, the plurality of pole pieces includes an outermost pole piece, the outermost pole piece being a positive pole piece, the notch being provided at least on the outermost pole piece.

In some embodiments, the plurality of pole pieces includes an outermost pole piece located at an outermost side in the preset direction, the outermost pole piece is a negative pole piece, and the notch is at least provided on the outermost pole piece and a pole piece adjacent to the outermost pole piece.

In some embodiments, the notch comprises a positive notch and a negative notch, the positive notch is disposed on at least one positive plate, the negative notch is disposed on at least one negative plate, and a total cross-section of the positive notch on the at least one positive plate is greater than a total cross-section of the negative notch on the at least one negative plate.

In some embodiments, the avoidance portion is disposed at an edge of the battery cell, the plurality of pole pieces includes a first set of pole pieces and a second set of pole pieces, a width of the first set of pole pieces is less than a width of the second set of pole pieces, and/or a length of the first set of pole pieces is less than a length of the second set of pole pieces, the avoidance portion is formed between the first set of pole pieces and the second set of pole pieces.

In some embodiments, one end of the first set of pole pieces in its width direction is aligned with one end of the second set of pole pieces in its width direction in the preset direction.

In some embodiments, the first set of pole pieces has a first pole piece adjacent to the second set of pole pieces, the second set of pole pieces has a second pole piece adjacent to the first set of pole pieces, each of the first and second pole pieces is a single-sided positive pole piece; or the first pole piece is a double-sided positive pole piece, and the second pole piece is a double-sided negative pole piece.

In some embodiments, the second electrode sheet is the double-sided negative electrode sheet, the double-sided negative electrode sheet includes a foil layer, and a first active layer and a second active layer disposed on two sides of the foil layer, the first active layer is connected with the positive electrode sheet of the first group of electrode sheets, and an area of the first active layer is equal to an area of the first electrode sheet.

The battery of the embodiment of the disclosure comprises the battery cell of any one of the embodiments.

The terminal equipment of the embodiment of the disclosure comprises the battery of the embodiment.

Drawings

Fig. 1 is a perspective view of a battery cell according to one embodiment of the present disclosure.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is another exploded view of fig. 1.

Fig. 4 is a perspective view of a cell of another embodiment of the present disclosure.

Fig. 5 is a perspective view of a cell of yet another embodiment of the present disclosure.

Fig. 6 is a cross-sectional view of two positive plates of the present disclosure.

Fig. 7 is a cross-sectional view of a double-sided negative plate of the present disclosure.

Fig. 8 is a cross-sectional view of another double-sided negative plate of the present disclosure.

Reference numerals:

a cell 100;

a positive plate 1; a negative electrode sheet 2; an avoidance unit 3; a concave portion 31; a step portion 32; a hollowed-out hole 4;

a first surface 11; a second surface 12.

Detailed Description

Embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, are described in detail below. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

The battery cell 100 of the embodiment of the present disclosure, and the battery and the terminal device having the battery cell 100 are described below with reference to fig. 1 to 8.

The terminal device of the embodiment of the disclosure includes a receiving cavity, a battery cell 100 and a battery chip.

The battery cell 100 and the battery chip are both disposed in the accommodation chamber, the battery cell 100 includes a plurality of pole pieces, the plurality of pole pieces are disposed in a stacked manner along a predetermined direction (for example, an up-down direction shown in fig. 1 and 2), the plurality of pole pieces include a plurality of positive pole pieces 1 and a plurality of negative pole pieces 2, the positive pole pieces 1 and the negative pole pieces 2 are alternately disposed in the predetermined direction, the battery cell 100 has a first surface 11 and a second surface 12 disposed opposite to each other in the predetermined direction, and at least one of the first surface 11 and the second surface 12 has an escape portion 3. In other words, the relief portion 3 may be provided on the first surface 11, the relief portion 3 may be provided on the second surface 12, and the relief portion 3 may also be provided on the first surface 11 and the second surface 12. The battery chip and the avoidance portion 3 are spatially and dimensionally matched with the battery chip.

In the related art, the surfaces of the battery cell 100 in the thickness direction are all flat surfaces, and the part of the terminal equipment for placing the battery cell 100 has related components (battery chip) and has mounting interference with the battery cell 100. The overall thickness of the battery is generally reduced by reducing the number of pole pieces to avoid interference between the battery cell 100 and related components, but reducing the number of pole pieces has the problems of low battery capacity and low space utilization of corresponding terminal equipment.

According to the terminal equipment disclosed by the embodiment of the disclosure, the avoidance parts 3 are arranged on the surface of the battery cell 100 in the preset direction, so that interference with related components can be avoided on the basis of reducing the number of pole pieces. Therefore, the terminal equipment of the embodiment of the disclosure has the advantage of high capacity. In addition, because the number of the pole pieces is not reduced, the battery cell can occupy the space for accommodating the battery cell as much as possible, and the space utilization rate of the accommodating cavity is improved. And can avoid electric core 100 to appear rocking in the holding intracavity to a certain extent, promoted the stability of electric core 100.

Therefore, the terminal device of the embodiment of the disclosure has the advantages of improving the space utilization, the capacity of the battery and the stability of the battery cell 100.

As shown in fig. 1 and 4, at least some of the plurality of pole pieces are provided with notches, and the notches of at least some of the pole pieces are opposite and communicate to form the avoiding portion 3. In other words, one pole piece at the end may have a notch, or two or more pole pieces may have notches. The depth of the escape portion 3 in the preset direction (for example, the up-down direction shown in fig. 1) is determined according to the number of pole pieces having the notch.

Alternatively, the notch shape may be rectangular or square. The shape of the notch can be set according to the peripheral outline of the component needing to be avoided.

As shown in fig. 1 and 4, each of the positive electrode sheet 1 and the negative electrode sheet 2 has a plurality of, and the total area of the plurality of positive electrode sheets 1 having the notch is larger than the total area of the plurality of negative electrode sheets 2 having the notch. Thereby, the ions transferred by the positive electrode sheet 1 can be further lifted to provide sufficient bearing space.

Specifically, as shown in fig. 1 and 2, a notch is provided in the middle region of the pole piece to provide the cell 100 with a recess 31. In other words, the escape portion 3 is provided in the middle region of the battery cell 100. The notch is a hollow hole 4 formed on the corresponding pole piece, and the avoiding portion 3 is an area of the middle of the surface of the battery cell 100, which is recessed inwards to form the recessed portion 31.

According to the terminal equipment disclosed by the embodiment of the disclosure, the corresponding gaps are formed in part of the pole pieces, the gaps are opposite and communicated to form the avoidance part 3, the depth and the size of the avoidance part 3 in the preset direction can be set according to the positions of related components, the number of pole pieces with the gaps is set according to the space occupied by the related components (battery chips) in the preset direction, and the terminal equipment has the advantages of high flexibility, convenience in manufacturing and simple structure.

As shown in fig. 2 and 3, the plurality of pole pieces includes an outermost pole piece, which is a positive pole piece 1, and the notch is at least provided on the outermost pole piece. In other words, the number of positive electrode sheets 1 having the notch is equal to or greater than the number of negative electrode sheets 2 having the notch. It can be understood that the avoiding portion 3 is disposed on the first surface 11 or the second surface 12 of the battery cell 100, the avoiding portion 3 extends from the first surface 11 of the battery cell 100 toward the second surface 12 of the battery cell 100 along a preset direction, the electrode sheet at one end of the battery cell 100 having the first surface 11 is the positive electrode sheet 1, and the avoiding portion 3 at least penetrates through the positive electrode sheet 1.

Specifically, the positive plate 1 with the notch, the negative plate 2 with the notch, the positive plate 1 with the notch and the negative plate 2 with the notch are sequentially alternated until the formed avoiding part 3 has no installation interference with corresponding components in the size of the preset direction. The number of positive electrode sheets and negative electrode sheets having the notches may be the same or the number of positive electrode sheets and negative electrode sheets having the notches may be different. The accommodating cavities can be stacked at will according to the size of the accommodating cavities in the preset direction, and the accommodating cavity has the advantage of flexible stacking.

For example, in fig. 2, the battery cell 100 includes seven electrode plates, which are a first positive electrode plate, a first negative electrode plate, a second positive electrode plate, a second negative electrode plate, a third positive electrode plate, a third negative electrode plate, and a fourth positive electrode plate, in order from top to bottom. Only the first positive electrode sheet may have a notch, or both the first positive electrode sheet and the first negative electrode sheet may have a notch.

As shown in fig. 1 and 3, the plurality of pole pieces includes an outermost pole piece located at the outermost side in the preset direction, the outermost pole piece is a negative pole piece 2, and the notch is at least provided on the outermost pole piece and the pole piece adjacent to the outermost pole piece. In other words, the number of positive electrode sheets 1 having the notch is equal to the number of negative electrode sheets 2 having the notch. So as to satisfy that the negative electrode has enough space to bear ions transferred by the positive electrode plate 1 and ensure the normal charge and discharge of the battery cell 100.

As shown in fig. 1 and 3, the notch includes a positive electrode notch and a negative electrode notch, the positive electrode notch is provided on at least one positive electrode sheet 1, the negative electrode notch is provided on at least one negative electrode sheet 2, and the total cross section of the positive electrode notch on at least one positive electrode sheet 1 is larger than the total cross section of the negative electrode notch on at least one negative electrode sheet 2. It can be understood that the plurality of positive electrode notches and the negative electrode notches form the escape portion 3.

The terminal device of the embodiment of the present disclosure is configured such that the total cross-section of the positive electrode notch on at least one positive electrode sheet 1 is larger than the total cross-section of the negative electrode notch on at least one negative electrode sheet 2. The ions transferred by the positive plate 1 can be further lifted to provide sufficient bearing space.

In another embodiment of the present disclosure, a terminal device includes a housing cell 100 and a curved screen. The housing has a receiving cavity, the battery cell 100 is disposed in the receiving cavity, and the curved screen covers the housing and has a portion of the receiving cavity.

As shown in fig. 4, the first set of pole pieces are stacked on top of the second set of pole pieces. The first set of pole pieces may have a width that is less than the width of the second set of pole pieces, or the first set of pole pieces may have a length that is less than the length of the second set of pole pieces, or the first set of pole pieces may have a width and length that are less than the width (e.g., the front-to-back direction shown in fig. 4) and length (e.g., the left-to-right direction shown in fig. 4) of the second set of pole pieces. The avoiding part 3 is formed between the first group of pole pieces and the second group of pole pieces, and a part of the curved surface screen extends into the avoiding part 3.

In other words, the first group of pole pieces and the second group of pole pieces are stacked along the preset direction, the step portion 32 is formed between the first group of pole pieces and the second group of pole pieces, and a part of the curved surface screen extends into the accommodating cavity and abuts against the step portion 32. The steps can be formed around the first group of pole pieces and the second group of pole pieces, and one side between the first group of pole pieces and the second group of pole pieces can also be formed.

According to the terminal equipment disclosed by the embodiment of the disclosure, the avoidance parts 3 are arranged on the surface of the battery cell 100 in the preset direction, so that interference with related components can be avoided on the basis of reducing the number of pole pieces. Therefore, the terminal equipment of the embodiment of the disclosure has the advantage of high capacity. In addition, because the number of pole pieces is not reduced, the space utilization rate of the accommodating cavity is improved, the shaking of the battery cell 100 in the accommodating cavity can be avoided to a certain extent, and the stability of the battery cell 100 is improved.

As shown in fig. 4 and 5, one end of the first group of pole pieces in the width direction thereof is aligned with one end of the second group of pole pieces in the width direction thereof in a preset direction. In other words, the other end of the first group of pole pieces in the width direction thereof and the other end of the second group of pole pieces in the width direction thereof form the stepped portion 32 in the preset direction.

According to the terminal equipment disclosed by the embodiment of the disclosure, the first group of pole pieces and the second group of pole pieces are aligned in the preset direction at one ends in the width direction, so that the terminal equipment has the advantage of convenience in stacking the pole pieces. In addition, the convenience of installation of the terminal device having the battery cell 100 can be improved.

As shown in fig. 5, the first set of pole pieces has a first pole piece adjacent to a second set of pole pieces, the second set of pole pieces has a second pole piece adjacent to the first set of pole pieces, each of the first and second pole pieces being a single-sided positive pole piece. In other words, a first pole piece of the first set of pole pieces is connected to a second pole piece of the second set of pole pieces. The double-sided negative plate comprises a layer of isolating film and negative active layers coated on the two side surfaces of the isolating film; the double-sided positive plate comprises a layer of isolating film and positive electrode active layers coated on the two side surfaces of the isolating film.

The terminal device of the embodiments of the present disclosure is not limited thereto, for example, in other embodiments, the first set of pole pieces has a first pole piece adjacent to a second set of pole pieces, the second set of pole pieces has a second pole piece adjacent to the first set of pole pieces, the first pole piece is a double-sided positive pole piece, for example, as shown in fig. 7 and 8, and the second pole piece is a double-sided negative pole piece.

The terminal equipment of the embodiment of the disclosure is characterized in that the first pole piece is a double-sided positive pole piece, the second pole piece is a double-sided negative pole piece, and a single-sided positive pole piece mode is set for both the first pole piece and the second pole piece, which is substantially equivalent to a double-sided positive pole piece, but the thickness of the single-sided positive pole piece of two layers is equal to the thickness of the isolation film of two layers plus the thickness of the active layer of two layers. For example, as shown in fig. 6, the thickness of the two-layer single-sided positive electrode sheet H1 is equal to the thickness H2 of the two active layers plus two isolation films H3, i.e., H1 is equal to 2h2+2h3, and the thickness of the two-sided positive electrode sheet is equal to the thickness of one isolation film plus the thickness of the two active layers, and in the case that the number of layers of the battery cell 100 is the same, the terminal device of the embodiment of the disclosure has an advantage of further saving space. Therefore, under the condition that the space of the accommodating cavity is certain, the terminal equipment of the embodiment of the disclosure has the advantage of large capacity of the battery cell 100.

As shown in fig. 5 and 8, the second electrode sheet is a double-sided negative electrode sheet 2, the double-sided negative electrode sheet 2 includes a foil layer, and a first active layer and a second active layer disposed on two sides of the foil layer, the first active layer is connected with the positive electrode sheet 1 of the first group of electrode sheets, and the area of the first active layer is equal to that of the first electrode sheet.

The terminal equipment of the embodiment of the disclosure is characterized in that the first pole piece is a double-sided positive pole piece, the second pole piece is a double-sided negative pole piece, the double-sided negative pole piece comprises a foil layer, and a first active layer and a second active layer which are arranged on two sides of the foil layer, which are equivalent to empty foil layers at the part where steps are arranged, and the terminal equipment has the advantage of saving space in a containing cavity.

The battery cell 100 of the embodiments of the present disclosure is according to the technical features of the battery cell described above.

Alternatively, the cell 100 may be a sodium ion cell or a lithium ion cell.

The battery of the embodiment of the present disclosure includes the above-described battery cell 100.

In the description of the present disclosure, 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", "longitudinal", "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 disclosure 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 disclosure.

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 at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.

In the present disclosure, unless explicitly specified 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

In this disclosure, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., mean 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 present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations of the above embodiments will be within the scope of the present disclosure by those of ordinary skill in the art.

Claims

The utility model provides a battery cell, its characterized in that includes a plurality of pole pieces, and a plurality of the pole pieces are along predetermineeing the direction range upon range of setting, a plurality of the pole pieces include positive plate and negative plate, the positive plate with the negative plate is in the direction of predetermineeing is arranged alternately, the battery cell has the first surface and the second surface that set up relatively in the direction of predetermineeing, first surface with at least one of second surface has dodges the portion.
The cell of claim 1, wherein at least some of the plurality of pole pieces are provided with notches, the notches of the at least some pole pieces being opposed and in communication to form the relief portion.
The cell of claim 2, wherein each of the positive and negative electrode sheets has a plurality, and a total area of the plurality of positive electrode sheets having the indentations is greater than a total area of the plurality of negative electrode sheets having the indentations.
A cell according to claim 3, wherein the notch is provided in a central region of the pole piece.
The cell of claim 4, wherein the plurality of pole pieces comprises an outermost pole piece, the outermost pole piece being a positive pole piece, the notch being provided at least on the outermost pole piece.
The cell of claim 4, wherein the plurality of pole pieces includes an outermost pole piece located outermost in the predetermined direction, the outermost pole piece being a negative pole piece, the notch being provided at least on the outermost pole piece and a pole piece adjacent to the outermost pole piece.
The cell of claim 6, wherein the indentations comprise positive and negative indentations, the positive indentation being provided on at least one of the positive plates, the negative indentation being provided on at least one of the negative plates, the total cross-section of the positive indentation on the at least one positive plate being greater than the total cross-section of the negative indentation on the at least one negative plate.
A cell according to claim 3, wherein the relief is provided at the edge of the cell, the plurality of pole pieces comprising a first set of pole pieces and a second set of pole pieces, the first set of pole pieces having a width less than the width of the second set of pole pieces and/or the first set of pole pieces having a length less than the length of the second set of pole pieces, the relief being formed between the first set of pole pieces and the second set of pole pieces.
The cell of claim 8, wherein one end of the first set of pole pieces in the width direction thereof is aligned with one end of the second set of pole pieces in the width direction thereof in the preset direction.
The cell of claim 8, wherein the first set of pole pieces has a first pole piece adjacent to the second set of pole pieces, the second set of pole pieces has a second pole piece adjacent to the first set of pole pieces, each of the first and second pole pieces is a single-sided positive pole piece; or the first pole piece is a double-sided positive pole piece, and the second pole piece is a double-sided negative pole piece.
The cell of claim 10, wherein the second electrode sheet is the double-sided negative electrode sheet, the double-sided negative electrode sheet comprises a foil layer, and a first active layer and a second active layer disposed on two sides of the foil layer, the first active layer is connected to the positive electrode sheets of the first set of electrode sheets, and an area of the first active layer is equal to an area of the first electrode sheet.
A battery comprising a cell according to any one of claims 1-11.
Terminal device, characterized in that it comprises a battery according to claim 12.