High-capacity battery cell

Abstract

The utility model relates to the technical field of battery cells, and particularly discloses a high-capacity battery cell, which comprises a shell, an upper cover, an inner pole and a plurality of roll cores, the upper cover can be buckled on the shell, the upper cover and the shell are encircled to form a sealed accommodating cavity, the inner pole and the plurality of roll cores are positioned in the accommodating cavity, the inner pole is fixed on the inner side of the shell, and the inner pole is fixed on the outer side of the shell. The multiple roll cores are all stacked in the containing cavity, the multiple roll cores are all provided with the tabs, the multiple tabs are all welded to the inner pole column, due to the fact that the multiple roll cores are adopted, compared with a single-roll-core structure, the capacity is higher, compared with multiple battery cores with small capacity, the cost is lower, meanwhile, gaps exist between the multiple roll cores, electrolyte can pass through the gaps, and therefore the capacity of the battery core is improved. And meanwhile, due to the arrangement of the multiple tabs, the heat dissipation area can be increased, the temperature of the tabs can be prevented from being too high, and due to the fact that the multiple tabs are welded at the same time, the welding area can be increased, and pseudo soldering or solder skips can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, in particular to a large-capacity battery cell. Background Art

[0002] Traditional square shell battery cells or large cylindrical battery cells generally adopt a single-core structure. During use, if the core is made too thick, the electrolyte will not be able to completely penetrate the electrode, resulting in increased self-discharge and low voltage, which in turn affects the service life of the battery cell. The tabs need to be welded to the inner pole. If the overall thickness of the core is large, the thickness of the tabs also needs to be thickened. Cold welding or welding leakage may occur at the tabs. Therefore, due to the limitations of the single-core, the maximum capacity of such battery cells on the market can usually only reach about 280Ah, which has become the main obstacle to further increasing the battery cell capacity. Summary of the Invention

[0003] The present utility model is made in consideration of the above-mentioned problems. The purpose of the utility model is to provide a large-capacity battery cell, which increases the battery capacity by setting up multiple winding cores. At the same time, the electrolyte can completely infiltrate the winding core pole pieces through the gaps between adjacent winding cores, and multiple pole ears are welded to the cylinder, which can increase the overall welding area and avoid the occurrence of cold welding or leaking welding.

[0004] To achieve the above-mentioned object, the present invention provides a large-capacity battery cell, comprising a shell, an upper cover, an inner pole, and a plurality of winding cores, wherein the upper cover can be fastened to the shell and can be enclosed with the shell to form a sealed accommodating cavity, wherein the inner pole and the plurality of winding cores are all located in the accommodating cavity;

[0005] The inner pole is fixed on the inner side of the shell, the multiple winding cores are stacked in the accommodating cavity, and the multiple winding cores are provided with tabs, and the multiple tabs are welded to the inner pole.

[0006] According to the large-capacity battery cell described above, the accommodating cavity includes a first cavity and a second cavity arranged in a horizontal direction, and the two groups of the cores are stacked in the first cavity and the second cavity respectively.

[0007] According to the large-capacity battery cell described above, each group of the cores includes at least three cores, and the three cores are stacked in the up-down direction in the first cavity or the second cavity.

[0008] According to the large-capacity battery cell described above, a gap is provided between two adjacent winding cores for allowing electrolyte to pass through.

[0009] According to the large-capacity battery cell described above, it also includes a diaphragm, which is located between the upper cover and the winding core and is used to isolate the upper cover from the winding core.

[0010] According to the large-capacity battery cell described above, the diaphragm is provided with liquid holes, and a plurality of the liquid holes are arranged at intervals in the diaphragm and can penetrate both end surfaces of the diaphragm.

[0011] According to the large-capacity battery cell described above, a handle is provided on the shell, and the handle is detachably fixed to the end of the shell.

[0012] The utility model has the following beneficial effects:

[0013] 1. Each battery cell includes multiple winding cores, which can increase the capacity of the battery cell without increasing the thickness of each winding core. The electrolyte can more easily enter the gaps between the multiple winding cores, which is conducive to the complete infiltration of the electrode by the electrolyte.

[0014] 2. Each winding core is equipped with a pole ear and an inner pole for welding, which can increase the overall welding area, not only to increase the heat dissipation area, but also to avoid cold welding or leaking welding, thereby increasing the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic diagram of the overall structure of the embodiment;

[0016] Figure 2 It is an exploded view of the overall structure of the embodiment;

[0017] Figure 3 Schematic diagram of the appearance of the battery cell of the embodiment.

[0018] In the picture:

[0019] 1. Shell; 2. Upper cover; 3. Inner pole; 4. Winding core; 5. Tab; 6. Diaphragm; 7. Liquid hole; 8. Handle; 9. Battery cell. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1-3 As shown, a large-capacity battery cell includes a shell 1, an upper cover 2, an inner pole 3 and multiple winding cores 4. The upper cover 2 can be snapped onto the shell 1 and together with the shell 1 form a sealed accommodating cavity. The inner pole 3 and the multiple winding cores 4 are all located in the accommodating cavity to be assembled into a complete battery cell 9.

[0022] Among them, the inner pole 3 is fixed on the inner side of the shell 1, and multiple winding cores 4 are stacked in the accommodating cavity, and multiple winding cores 4 are provided with pole ears 5, and multiple pole ears 5 are welded to the inner pole 3. Due to the use of multiple winding cores 4, compared with the single winding core 4 structure, its capacity is higher, and compared with multiple small-capacity battery cells 9, its cost is lower. At the same time, there will be gaps between the multiple winding cores 4, and the gaps can allow electrolyte to pass through, which is conducive to the complete infiltration of the electrolyte into the pole piece of the winding core 4, thereby improving product quality. At the same time, the arrangement of multiple pole ears 5 can increase the heat dissipation area to avoid excessive temperature of the pole ears 5. At the same time, multiple pole ears 5 are welded at the same time, which can increase the welding area and avoid cold welding or leaking welding.

[0023] Specifically, the accommodating cavity includes a first cavity and a second cavity arranged in the horizontal direction, and the two groups of cores 4 are stacked in the first cavity and the second cavity respectively, that is, the two groups of cores 4 are arranged horizontally left and right in the shell 1, which can fully utilize the space in the shell 1 and increase the stacking quantity, and each group of cores 4 includes at least three cores 4, and the three cores 4 are arranged in the first cavity or the second cavity in the up and down directions. The specific number of cores 4 is determined by the height of the accommodating cavity of the shell 1, and any two adjacent cores 4 are provided with this gap to ensure that the electrolyte can contact each core 4.

[0024] In this embodiment, the battery cell 9 also includes a diaphragm 6, which is located between the upper cover 2 and the winding core 4 and is used to isolate the upper cover 2 and the winding core 4 to prevent the electric energy of the winding core 4 from leaking to the upper cover 2. A liquid through hole 7 is provided on the diaphragm 6. Multiple liquid through holes 7 are arranged at intervals in the diaphragm 6 and can pass through the two end surfaces of the diaphragm 6. Through the liquid through holes 7, the circulation efficiency of the electrolyte on both sides of the accommodating cavity can be improved.

[0025] Specifically, the housing 1 is provided with a handle 8 , which is detachably fixed to the end of the housing 1 . The battery cell 9 can be better lifted and taken out through the handle 8 .

[0026] The technical solution of the present invention has been described in detail above with reference to the accompanying drawings, and the embodiments described are intended to help understand the concept of the present invention. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention may make various modifications or additions to the described specific embodiments, or adopt similar methods to replace them, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A large-capacity battery cell, characterized in that: The device comprises a shell, an upper cover, an inner pole and a plurality of winding cores. The upper cover can be fastened to the shell and can be combined with the shell to form a sealed accommodating cavity. The inner pole and the plurality of winding cores are all located in the accommodating cavity. The inner pole is fixed on the inner side of the shell, the multiple winding cores are stacked in the accommodating cavity, and the multiple winding cores are provided with tabs, and the multiple tabs are welded to the inner pole.

2. A large-capacity battery cell according to claim 1, characterized in that: The accommodating cavity includes a first cavity and a second cavity arranged in a horizontal direction, and the two groups of cores are stacked in the first cavity and the second cavity respectively.

3. A large-capacity battery cell according to claim 2, characterized in that: Each group of the winding cores includes at least three winding cores, and the three winding cores are stacked in the first cavity or the second cavity along the up-down direction.

4. A large-capacity battery cell according to claim 3, characterized in that: A gap is provided between two adjacent winding cores for allowing electrolyte to pass through.

5. A large-capacity battery cell according to claim 1, characterized in that: It also includes a diaphragm, which is located between the upper cover and the winding core and is used to isolate the upper cover from the winding core.

6. A large-capacity battery cell according to claim 5, characterized in that: The diaphragm is provided with liquid holes, and a plurality of the liquid holes are arranged at intervals in the diaphragm and can pass through both end surfaces of the diaphragm.

7. A large-capacity battery cell according to claim 1, characterized in that: The shell is provided with a handle, and the handle is detachably fixed to the end of the shell.

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