Novel battery cell and battery

Abstract

The utility model relates to the technical field of battery cells, and particularly discloses a novel battery cell and a battery, the battery cell comprises a positive plate, a negative plate and diaphragms coated on two sides of the positive plate and the negative plate, the positive plate is provided with a plurality of first pore channels, and the plurality of first pore channels are positioned on the same side of the positive plate and penetrate through the positive plate; when an electrolyte exists in the accommodating cavity of the shell, the electrolyte can flow into the first pore channel groove from a gap between the inner wall of the shell and the battery cell, so that the distance of the electrolyte infiltrating into the positive plate can be shortened, and the infiltration degree and the rate are further improved; in addition, gas generated by cell formation can also circulate up and down and can be discharged along the first hole channel groove, so that the cell forming quality is improved, the service life of the cell is prolonged, and meanwhile, black spots and lithium precipitation caused by gas generation of the cell can be avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of battery cells, and specifically to a novel battery cell and battery. Background Technology

[0002] Lithium-ion batteries have been widely used in power, energy storage, and 3C consumer electronics fields due to their excellent properties such as high operating voltage, high energy density, long lifespan, low self-discharge, no memory effect, good safety performance, and no pollution. However, the most important performance of a battery is its range, that is, its ability to store electrical energy. Without significant breakthroughs in cell materials, the common way to improve battery storage capacity is to increase the size and capacity of the battery cells. This can save on auxiliary materials and reduce costs while increasing energy storage capacity. However, larger size and larger capacity cells lead to a longer distance from the surface of the cell electrode to the interior, resulting in poor electrolyte wetting and difficulty in venting gas generated during cell formation. This can lead to shorter cell lifespan, increased cell manufacturing costs, and phenomena such as black spots and lithium plating caused by gas generation.

[0003] In existing technologies, to improve the electrolyte wettability of large-size, high-capacity battery cells, the compaction density of the electrode sheets is reduced to increase the porosity within the electrode sheets, making it easier for the electrolyte to penetrate the electrode sheets. However, the improvement effect is limited, and it increases the electron transfer path and the internal resistance of the battery. To improve the venting function, methods such as increasing the formation pressure, decreasing the formation current, and increasing the vacuum intensity of the secondary sealing of the battery cell are used to reduce the amount of gas and make it easier to expel. However, this increases the cell formation time, reduces the cell flow rate, and the secondary sealing vacuum will extract more liquid, reducing the liquid retention capacity. Therefore, another solution has emerged, which is to open channels on the electrode sheets, as disclosed in patent CN117832591A. This involves opening holes or grooves in the powder area of ​​the electrode sheets, allowing the electrolyte to remain there and improving the wettability of the electrode sheets. However, since the holes are only opened in the powder area, the gas still cannot be expelled, and the opening of the holes is difficult, increasing the manufacturing cost of the battery cell. Summary of the Invention

[0004] This utility model addresses the aforementioned problems and aims to provide a novel battery cell and battery. By creating a channel groove through the positive electrode plate, the electrolyte can easily enter the channel groove, improving wettability and also enhancing the venting function.

[0005] To achieve the above objectives, this utility model provides a novel battery cell, comprising a positive electrode, a negative electrode, and a separator covering both sides of the positive electrode and the negative electrode, wherein the positive electrode, the separator, and the negative electrode are stacked together.

[0006] The positive electrode sheet is provided with a first channel groove, and a plurality of the first channel grooves are located on one side of the positive electrode sheet and penetrate the positive electrode sheet.

[0007] According to the novel battery cell described above, each of the positive electrode plates is provided with a plurality of first channel slots, and the opening directions of the plurality of first channel slots are all consistent.

[0008] According to the novel battery cell described above, the opening direction of the plurality of first channel slots is consistent with the width direction of the positive electrode sheet, and the length of the first channel slot is greater than half the width of the positive electrode sheet and less than the width of the positive electrode sheet.

[0009] According to the novel battery cell described above, a plurality of first channel slots are arranged at intervals along the length direction of the positive electrode sheet, and the number of first channel slots is less than or equal to half of the ratio of the length to the width of the positive electrode sheet.

[0010] According to the novel battery cell described above, the width of the first channel groove is less than or equal to 1 mm.

[0011] According to the novel battery cell described above, a second channel groove is formed on the negative electrode sheet. The second channel groove corresponds one-to-one with the first channel groove, and the length of the second channel groove is less than the length of the first channel groove, and the width of the second channel groove is less than the width of the first channel groove.

[0012] According to the above-described novel battery cell, a third channel groove is formed on the separator. The third channel groove corresponds one-to-one with the second channel groove, and the length of the third channel groove is less than the length of the second channel groove, and the width of the third channel groove is less than the width of the second channel groove.

[0013] According to the novel battery cell described above, multiple separators are arranged independently between multiple positive electrode plates and multiple negative electrode plates.

[0014] A battery comprising:

[0015] The outer shell has an airbag-like structure on it;

[0016] A battery cell, wherein multiple battery cells are stacked inside the housing, each battery cell including a positive electrode, a negative electrode, and a separator covering both sides of the positive electrode and the negative electrode, the positive electrode, the separator, and the negative electrode being stacked in a form;

[0017] The positive electrode plate is provided with a first channel groove, and a plurality of the first channel grooves are located on one side of the positive electrode plate and penetrate the positive electrode plate. The air bag can be used to receive the gas discharged from the first channel.

[0018] According to the battery described above, the negative electrode sheet is provided with a second channel groove, the separator is provided with a third channel groove, the second channel groove corresponds one-to-one with the first channel groove, the third channel groove corresponds one-to-one with the second channel groove, and the air bag can be used to receive the gas discharged from the second channel groove and the third channel groove.

[0019] The outer shell has a first side and a second side facing each other. The airbag is detachably installed on the first side. The openings of the first channel groove, the second channel groove and the third channel groove all face the first side.

[0020] The present invention has the following beneficial effects: Since a number of first channel grooves are provided on the positive electrode plate, and the first channel grooves penetrate the upper and lower end faces of the positive electrode plate, the gas flow of the first channel grooves is relatively smooth when the electrolyte is retained, which facilitates the gas discharge. At the same time, since the opening direction of the first channel grooves is consistent and they all face the air bag, it is convenient to evacuate the cell during the second sealing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall exploded structure of Example 1;

[0022] Figure 2 This is a schematic diagram of the positive electrode structure in Example 1.

[0023] In the picture:

[0024] 1. Positive electrode plate; 2. Negative electrode plate; 3. Separator; 4. First channel groove; 5. Positive electrode tab; 6. Negative electrode tab. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figure 1 and Figure 2 As shown, a battery includes a casing and a battery cell. One or more battery cells are placed inside the casing. The battery cell has channels and grooves that can be used for liquid retention and venting, thereby ensuring the normal operation of the battery.

[0027] One novel battery cell includes a positive electrode 1, a negative electrode 2, and a separator 3 covering both sides of the positive electrode 1 and the negative electrode 2. In this embodiment, the battery cell is formed by stacking the positive electrode 1, the separator 3, and the negative electrode 2 in the following order: separator 3, positive electrode 1, separator 3, negative electrode 2, separator 3. A predetermined number of positive electrode 1, negative electrode 2, and separators are stacked to form a battery cell. Multiple separators 3 are arranged independently between multiple positive electrode 1 and negative electrode 2, and they are not connected to each other and do not affect the exhaust.

[0028] The positive electrode 1 has a positive electrode tab 5 at one end, and the negative electrode 2 has a negative electrode tab 6 at one end. The positive electrode tab 5 and the negative electrode tab 6 can be arranged in the same or opposite directions.

[0029] To improve the overall electrolyte wetting rate and venting efficiency of the battery cell, a plurality of first channel grooves 4 are provided on the positive electrode plate 1, i.e., at least one, but in this embodiment, multiple, and all of the multiple first channel grooves 4 are located on the same side of the positive electrode plate 1 and penetrate through the positive electrode plate 1. When electrolyte is present in the cavity of the outer shell, the electrolyte will flow into the first channel grooves 4 through the gap between the inner wall of the outer shell and the battery cell. This can shorten the distance for the electrolyte to wet the inside of the positive electrode plate 1, thereby improving the wetting rate and venting efficiency. At the same time, since the first channel grooves 4 penetrate through the upper and lower end faces of the positive electrode plate 1, i.e., they are connected vertically, the gas generated during the battery cell formation can also flow vertically and be discharged along the first channel grooves 4. Therefore, the battery cell forming quality is improved, the battery cell service life is extended, and black spots and lithium plating caused by gas generation can be avoided. Furthermore, since all of the multiple first channel grooves 4 are located on the same side of the positive electrode plate 1, the consistency of the liquid inlet and venting directions can be ensured, which facilitates the arrangement of the liquid inlet and venting outlet.

[0030] In this embodiment, the shape of the first channel groove 4 can be rectangular, triangular, trapezoidal, U-shaped, etc. It only needs to ensure that the small opening is inside the positive electrode plate 1 and the direction of the large opening is at the edge of the positive electrode plate 1, so as to facilitate gas discharge and prevent gas accumulation.

[0031] As mentioned above, each positive electrode 1 is provided with multiple first channel grooves 4, and the opening directions of the multiple first channel grooves 4 are all the same. Therefore, the liquid inlet of the battery only needs to be set on one side of the opening direction of the first channel groove 4 to ensure that the electrolyte can be quickly passed into the first channel groove 4, thereby increasing the liquid inlet speed, and thus increasing the wetting rate and the overall molding speed.

[0032] To ensure the electrolyte wetting rate, the opening direction of the multiple first channel grooves 4 is consistent with the width direction of the positive electrode plate 1, and the length of the first channel groove 4 is greater than half the width of the positive electrode plate 1 and less than the width of the positive electrode plate 1. This ensures that the first channel groove 4 will not divide the positive electrode plate 1, and at the same time, it can also ensure that the first channel groove 4 penetrates into the middle of the positive electrode plate 1, thereby increasing its electrolyte contact area and allowing it to penetrate deeper, thus greatly ensuring the electrolyte wetting rate.

[0033] To ensure the strength of the positive electrode 1 and prevent it from softening, multiple first channel grooves 4 are arranged at intervals along the length of the positive electrode 1. The number of first channel grooves 4 is less than or half the ratio of the length to the width of the second positive electrode 1, and the width of the first channel grooves 4 is less than or equal to 1 mm. When the number and width of the first channel grooves 4 are both within the above range, it can ensure the cell capacity and prevent the positive electrode 1 from softening. Therefore, the maximum number of first channel grooves 4 can be determined according to this range, so as to maximize the electrolyte wetting rate while ensuring the quality of the positive electrode 1.

[0034] In this embodiment, an airbag is provided on the outer wall of the outer shell. The airbag is used to receive the gas discharged from the first channel groove 4 of the battery cell. Since the opening direction of the first channel groove 4 is the same, the airbag only needs to be set on the outer shell in the opening direction of the first channel groove 4.

[0035] Specifically, the outer casing has a first side and a second side, and the airbag is detachably installed on the first side. The openings of the first channel groove 4 all face the first side. The airbag is installed on the first side during assembly. After collecting the gas, it can be removed to avoid affecting the overall battery and causing the battery volume to increase.

[0036] Example 2

[0037] In this embodiment, a novel battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator covering both sides of the positive electrode sheet and the negative electrode sheet. In this embodiment, the battery cell is formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in the following order: separator, positive electrode sheet, separator, negative electrode sheet, separator. A predetermined number of positive electrode sheets, negative electrode sheets, and membrane sheets are stacked to form a battery cell. The multiple separators are independent and not connected to each other.

[0038] To improve the overall electrolyte wetting rate and venting efficiency of the battery cell, a plurality of first channel grooves are provided on the positive electrode plate, i.e., at least one, but in this embodiment, multiple, and all of the multiple first channel grooves are located on the same side of the positive electrode plate and penetrate through it. When electrolyte is present in the housing cavity of the outer shell, it flows into the first channel grooves from the gap between the inner wall of the outer shell and the battery cell. This can shorten the distance for the electrolyte to wet the inside of the positive electrode plate, thereby improving the wetting rate and venting efficiency. At the same time, since the first channel grooves penetrate through the upper and lower end faces of the positive electrode plate, i.e., they are connected vertically, the gas generated during battery cell formation can also flow vertically and be discharged along the first channel grooves. Therefore, the battery cell forming quality is improved, the battery cell service life is extended, and black spots and lithium plating caused by gas generation can be avoided. Furthermore, since the multiple first channel grooves are located on the same side of the positive electrode plate, the consistency of the liquid inlet and venting directions can be ensured, which facilitates the arrangement of the liquid inlet and venting outlet.

[0039] Unlike Embodiment 1, in this embodiment, a second channel groove is also formed on the negative electrode sheet. The second channel groove corresponds one-to-one with the first channel groove, that is, the electrolyte can enter into the second channel groove, which can further expand the movement range of the electrolyte and further improve the wetting rate and wettability of the electrolyte on the negative electrode sheet. Moreover, limiting the size of the second channel groove to be smaller than the size of the first channel groove can ensure that the negative electrode sheet can be completely covered on the outside of the positive electrode sheet, without violating the cell design principle.

[0040] Example 3

[0041] In this embodiment, a novel battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator covering both sides of the positive electrode sheet and the negative electrode sheet. In this embodiment, the battery cell is formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in the following order: separator, positive electrode sheet, separator, negative electrode sheet, separator. A predetermined number of positive electrode sheets, negative electrode sheets, and membrane sheets are stacked to form a battery cell. The multiple separators are independent and not connected to each other.

[0042] To improve the overall electrolyte wetting rate and venting efficiency of the battery cell, a plurality of first channel grooves are provided on the positive electrode plate, i.e., at least one, but in this embodiment, multiple, and all of the multiple first channel grooves are located on the same side of the positive electrode plate and penetrate through it. When electrolyte is present in the housing cavity of the outer shell, it flows into the first channel grooves from the gap between the inner wall of the outer shell and the battery cell. This can shorten the distance for the electrolyte to wet the inside of the positive electrode plate, thereby improving the wetting rate and venting efficiency. At the same time, since the first channel grooves penetrate through the upper and lower end faces of the positive electrode plate, i.e., they are connected vertically, the gas generated during battery cell formation can also flow vertically and be discharged along the first channel grooves. Therefore, the battery cell forming quality is improved, the battery cell service life is extended, and black spots and lithium plating caused by gas generation can be avoided. Furthermore, since the multiple first channel grooves are located on the same side of the positive electrode plate, the consistency of the liquid inlet and venting directions can be ensured, which facilitates the arrangement of the liquid inlet and venting outlet.

[0043] In this embodiment, a third channel groove is formed on the diaphragm, which corresponds one-to-one with the first channel groove. The third channel groove also penetrates the diaphragm, so the electrolyte in the first channel groove can contact the middle of the negative electrode plate through the third channel groove, thereby improving its wettability and wettability rate.

[0044] Example 4

[0045] In this embodiment, a novel battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator covering both sides of the positive electrode sheet and the negative electrode sheet. In this embodiment, the battery cell is formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet in the following order: separator, positive electrode sheet, separator, negative electrode sheet, separator. A predetermined number of positive electrode sheets, negative electrode sheets, and membrane sheets are stacked to form a battery cell. The multiple separators are independent and not connected to each other.

[0046] To improve the overall electrolyte wetting rate and venting efficiency of the battery cell, a plurality of first channel grooves are provided on the positive electrode plate, i.e., at least one, but in this embodiment, multiple, and all of the multiple first channel grooves are located on the same side of the positive electrode plate and penetrate through it. When electrolyte is present in the housing cavity of the outer shell, it flows into the first channel grooves from the gap between the inner wall of the outer shell and the battery cell. This can shorten the distance for the electrolyte to wet the inside of the positive electrode plate, thereby improving the wetting rate and venting efficiency. At the same time, since the first channel grooves penetrate through the upper and lower end faces of the positive electrode plate, i.e., they are connected vertically, the gas generated during battery cell formation can also flow vertically and be discharged along the first channel grooves. Therefore, the battery cell forming quality is improved, the battery cell service life is extended, and black spots and lithium plating caused by gas generation can be avoided. Furthermore, since the multiple first channel grooves are located on the same side of the positive electrode plate, the consistency of the liquid inlet and venting directions can be ensured, which facilitates the arrangement of the liquid inlet and venting outlet.

[0047] In this embodiment, a second channel groove is formed on the negative electrode sheet, and a third channel groove is formed on the separator. The second and third channel grooves correspond one-to-one with the first channel groove, which can ensure the maximum flowability of the electrolyte and further improve its wettability and rate.

[0048] The battery casing is equipped with an airbag, which can be used to receive the gas discharged from the first channel, the second channel and the third channel. Similarly, the casing is provided with a first side and a second side opposite to each other. The airbag is detachably installed on the first side, and the openings of the first channel, the second channel and the third channel all face the first side.

[0049] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A novel battery cell, characterized in that, It includes a positive electrode, a negative electrode, and a separator covering both sides of the positive electrode and the negative electrode, wherein the positive electrode, the separator, and the negative electrode are stacked together. The positive electrode sheet is provided with a first channel groove, and a plurality of the first channel grooves are located on one side of the positive electrode sheet and penetrate the positive electrode sheet.

2. The novel battery cell according to claim 1, characterized in that, Each of the positive electrode plates is provided with a plurality of first channel slots, and the opening direction of the plurality of first channel slots is consistent.

3. The novel battery cell according to claim 2, characterized in that, The opening direction of the plurality of first channel grooves is consistent with the width direction of the positive electrode sheet, and the length of the first channel groove is greater than half the width of the positive electrode sheet and less than the width of the positive electrode sheet.

4. A novel battery cell according to claim 3, characterized in that, Multiple first channel slots are arranged at intervals along the length direction of the positive electrode sheet, and the number of first channel slots is less than or equal to half of the length-to-width ratio of the positive electrode sheet.

5. A novel battery cell according to claim 3, characterized in that, The width of the first channel groove is less than or equal to 1 mm.

6. A novel battery cell according to claim 1, characterized in that, The negative electrode sheet has a second channel groove, which corresponds one-to-one with the first channel groove. The length of the second channel groove is less than the length of the first channel groove, and the width of the second channel groove is less than the width of the first channel groove.

7. A novel battery cell according to claim 6, characterized in that, The diaphragm has a third channel groove, which corresponds one-to-one with the second channel groove. The length of the third channel groove is less than the length of the second channel groove, and the width of the third channel groove is less than the width of the second channel groove.

8. A novel battery cell according to claim 1, characterized in that, Multiple separators are arranged independently between multiple positive electrode plates and multiple negative electrode plates.

9. A battery, characterized in that, include: The outer shell has an airbag-like structure on it; A battery cell, wherein multiple battery cells are stacked inside the housing, each battery cell including a positive electrode, a negative electrode, and a separator covering both sides of the positive electrode and the negative electrode, the positive electrode, the separator, and the negative electrode being stacked in a form; The positive electrode plate is provided with a first channel groove, and a plurality of the first channel grooves are located on one side of the positive electrode plate and penetrate the positive electrode plate. The air bag can be used to receive the gas discharged from the first channel.

10. A battery according to claim 9, characterized in that, The negative electrode sheet is provided with a second channel groove, and the diaphragm is provided with a third channel groove. The second channel groove corresponds one-to-one with the first channel groove, and the third channel groove corresponds one-to-one with the second channel groove. The air bag can be used to receive the gas discharged from the second channel groove and the third channel groove. The outer shell has a first side and a second side facing each other. The airbag is detachably installed on the first side. The openings of the first channel groove, the second channel groove and the third channel groove all face the first side.

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