High-capacity large battery cell

Abstract

The utility model relates to the field of energy storage cells, in particular to a high-capacity large cell. The embodiment of the utility model provides a high-capacity large battery cell. The high-capacity large battery cell comprises a plurality of cell packages, positive poles and negative poles, wherein the positive poles and the negative poles are arranged in a staggered manner; a split pole piece connecting assembly is arranged between the core packages; the pole piece connecting assembly is suitable for being electrically connected with the positive pole end of each core package and the positive pole column and electrically connected with the negative pole end of each core package and the negative pole column. The positive pole and the negative pole are distributed in a staggered manner, so that the space between the positive pole and the negative pole is expanded, and a plurality of core packages can be conveniently arranged in a large battery cell. The positive electrodes of the plurality of core packages are connected with the positive pole columns through the pole piece connecting assemblies, and the negative electrodes of the core packages are connected with the negative pole columns through the pole piece connecting assemblies, so that correct electrical connection in the large battery cell is ensured.

Description

Technical Field

[0001] The utility model relates to the field of energy storage batteries, in particular to high-capacity large batteries. Background Art

[0002] As the energy storage market continues to flourish, energy storage cell products are developing towards large capacity. The use of large-capacity cells will reduce the use of components on the PACK end and increase volume energy density; large-capacity cells can use fewer cells to achieve high capacity, reduce the number of parallel connections, and reduce the difficulty of BMS.

[0003] Most of the bare cells in the related technology are realized by winding technology, but due to the defects of the existing winding technology, when the bare cell is wider, the alignment of the positive and negative electrodes inside the cell cannot be guaranteed, resulting in the diaphragm failing to insulate the positive and negative electrodes, and there is a risk of internal short circuit. Therefore, it is impossible to achieve unlimited width of the bare cell, and if the thickness is increased, the heat dissipation capacity of the cell will be reduced. Therefore, the industrialization of large-capacity cells is difficult, and the impact on the life, efficiency and safety of the cell is an urgent problem to be solved. Utility Model Content

[0004] The purpose of the utility model is to provide a high-capacity large battery cell to solve the above problems.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a high-capacity large battery cell, including: a plurality of core packs, positive poles and negative poles arranged in a staggered manner;

[0006] There is a separately arranged pole piece connection assembly between the core packages; wherein

[0007] The electrode connecting assembly is suitable for electrically connecting the positive terminal of each core package with the positive electrode column, and the negative terminal of each core package with the negative electrode column.

[0008] Furthermore, the core package includes a positive electrode tab and a negative electrode tab, and the electrode connecting assembly includes a positive electrode connecting sheet and a negative electrode connecting sheet;

[0009] The positive electrode connecting piece sequentially connects the positive electrode tabs and the positive electrode column;

[0010] The negative electrode connecting piece sequentially connects the negative electrode tabs and the negative electrode column.

[0011] Furthermore, each of the core packages is symmetrically distributed on both sides of the pole piece connection assembly;

[0012] Adjacent core packages on the same side are arranged symmetrically.

[0013] Furthermore, the number of the core packages on the same side is two.

[0014] Furthermore, an insulating sheet is provided between the positive electrode connecting sheet and the negative electrode connecting sheet.

[0015] Furthermore, the outer sides of the positive electrode column and the negative electrode column are both covered with insulating rubber sleeves.

[0016] Furthermore, a top cover is provided on one side of the pole piece connection assembly.

[0017] Furthermore, two insulating baffles are arranged on the plastic plate, and the two insulating baffles correspond to the positive electrode column and the negative electrode column respectively.

[0018] Furthermore, the outer side of each core package is sequentially covered with a Mylar layer and an aluminum shell.

[0019] Furthermore, a bottom support sheet and a top patch sheet are respectively provided at two ends of the aluminum shell.

[0020] Compared with the prior art, the embodiments of the utility model have the following beneficial effects: by staggering the positive pole and the negative pole to expand the space between the positive pole and the negative pole, it is convenient to set multiple core packs in a large battery cell. The positive poles and positive poles of multiple core packs and the negative poles and negative poles of the core packs are connected by the pole piece connection assembly to ensure the correct electrical connection inside the large battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 An exploded view of a high-capacity large battery cell of the utility model is shown;

[0023] Figure 2 The schematic diagram of the structure of the pole piece connection assembly of the utility model is shown;

[0024] Figure 3 The schematic diagram of the structure of the top cover of the utility model is shown.

[0025] In the figure:

[0026] 1. Core package; 11. Positive pole ear; 12. Negative pole ear; 13. Insulating rubber sleeve;

[0027] 2. Positive pole; 3. Negative pole;

[0028] 4. Pole connecting assembly; 41. Positive connecting piece; 42. Negative connecting piece; 43. Insulating piece;

[0029] 5. Top cover; 51. Insulation baffle; 6. Mylar layer;

[0030] 7. Aluminum shell; 71. Bottom support piece; 72. Top patch. DETAILED DESCRIPTION

[0031] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0032] In order to increase the capacity of the battery cell, the related art tends to increase the volume of the battery cell. Large-capacity batteries can use fewer batteries to achieve high capacity, reduce the number of parallel connections, and reduce the difficulty of BMS. However, when the bare battery cell is wider, the alignment of the positive and negative electrodes inside the battery cell cannot be guaranteed, resulting in the diaphragm being unable to insulate the positive and negative electrodes, and there is a risk of internal short circuit. Therefore, it is impossible to achieve unlimited width of the bare battery cell, and if the thickness is increased, the heat dissipation capacity of the battery cell will deteriorate.

[0033] In order to solve the above problems, Figure 1 As shown, in at least one embodiment, a high-capacity large battery cell is provided, including: a plurality of core packs 1 and staggered positive poles 2 and negative poles 3, wherein the positive poles 2 and negative poles 3 are staggered to free up more space, thereby facilitating the arrangement of multiple core packs 1 around the positive poles 2 and negative poles 3. Compared with the arrangement in the related art, the above method can arrange multiple core packs 1 in a single battery cell, thereby expanding the capacity of a single battery cell and achieving the effect of a large-capacity battery cell. On the other hand, there are separately arranged pole piece connection components 4 between the core packs 1. The pole piece connection component 4 is suitable for electrically connecting the positive end of each core pack 1 with the positive pole 2, and the negative end of each core pack 1 with the negative pole 3. Through the arrangement of the pole piece connection component 4, the positive pole of each core pack 1 can be further connected to the positive pole 2, and the negative pole to the negative pole 3, thereby realizing that after multiple core packs 1 are loaded into a battery cell, the performance of each core pack 1 is not affected, and the production and manufacturing cost will not increase.

[0034] In order to achieve the above effects, in some embodiments, the positive terminal of the core package 1 is provided with a positive electrode tab 11, and the negative terminal of the core package 1 is provided with a negative electrode tab 12. At the same time, the electrode connecting assembly 4 includes a positive electrode connecting sheet 41 and a negative electrode connecting sheet 42. The positive electrode connecting sheet 41 can sequentially connect the positive electrode tabs 11 of each core package 1 and electrically connect to the positive electrode column 2. The negative electrode connecting sheet 42 can sequentially connect the negative electrode tabs 12 of each core package 1 and electrically connect to the negative electrode column 3. Through the above settings, the electrode connecting assembly 4 can realize the connection of each core package 1 with the positive electrode column 2 and the negative electrode column 3, thereby achieving the effect of a large-capacity battery cell.

[0035] In order to facilitate the electrode connection assembly 4 to electrically connect each core package 1 with the positive electrode column 2 and the negative electrode column 3, in some embodiments, each core package 1 is symmetrically distributed on both sides of the electrode connection assembly 4. That is, the positive electrode tab 11 and the negative electrode tab 12 of the core package 1 are both arranged toward one side of the electrode connection assembly 4, so that the positive electrode connection sheet 41 is conveniently connected to the positive electrode tab 11 of each core package 1 in sequence, and the negative electrode connection sheet 42 is conveniently connected to the negative electrode tab 12 of each core package 1 in sequence.

[0036] like Figure 2 As shown, in at least one embodiment, the number of the core packs 1 on the same side is two, and the two core packs 1 on the same side are symmetrically arranged. Figure 2 As shown, the negative pole tabs 12 of the two core packages 1 on the same side are arranged on the inner side of the battery cell as a whole, and the positive pole tabs 11 of the two core packages 1 on the same side are arranged on the outer side of the battery cell as a whole. The negative pole tabs 12 and the positive pole tabs 11 on both sides of the pole piece connection assembly 4 are arranged toward the center. The negative electrode connecting piece 42 is arranged in an I shape at the center of each core package 1, and the negative electrode connecting piece 42 is connected to the negative pole tabs 12 of each core package 1 in sequence. Preferably, the negative pole tab 12 and the negative pole connecting piece 42 are fixed by welding. The positive electrode connecting piece 41 is arranged in a C shape on the outer side of the negative electrode connecting piece 42, and a gap is set between the positive electrode connecting piece 41 and the negative electrode connecting piece 42. At the same time, the positive electrode connecting piece 41 is connected to the positive pole tabs 11 of each core package 1 in sequence. Preferably, the positive pole tab 11 and the positive electrode connecting piece 41 are fixed by welding.

[0037] like Figure 3 As shown, in some embodiments, in order to prevent the positive electrode connecting sheet 41 and the negative electrode connecting sheet 42 from short-circuiting, an insulating sheet 43 is provided between the positive electrode connecting sheet 41 and the negative electrode connecting sheet 42 to isolate the positive electrode connecting sheet 41 from the negative electrode connecting sheet 42 .

[0038] In order to prevent the positive pole 2 from short-circuiting with the negative connecting piece 42 , an insulating rubber sleeve 13 is sleeved on the outer side of the positive pole 2 . Similarly, in order to prevent the negative pole 3 from short-circuiting with the positive connecting piece 41 , an insulating rubber sleeve 13 is also sleeved on the outer side of the negative pole 3 .

[0039] In order to position the above-mentioned components, a top cover 5 is provided on one side of the electrode connection assembly 4. In order to prevent the positive electrode tab 11 from short-circuiting with the negative electrode column 3, and to prevent the negative electrode tab 12 from short-circuiting with the positive electrode column 2, in some embodiments, two insulating baffles 51 are provided on the top cover 5, and the two insulating baffles 51 correspond to the positive electrode column 2 and the negative electrode column 3 respectively.

[0040] like Figure 1As shown, in some embodiments, after the above components are installed, each core package 1 can be packaged into an aluminum shell 7. At the same time, in order to insulate the core package 1 from the aluminum shell 7, a Mylar layer 6, i.e., a polyester film layer, is also provided on the outside of the core package 1. A bottom support sheet 71 and a top patch sheet 72 are provided at both ends of the aluminum shell 7, respectively, so as to realize the packaging of the battery cell into the aluminum shell 7 as a whole.

[0041] In some embodiments, optionally, the outer layer of the aluminum shell 7 has a blue film.

[0042] It is worth mentioning that the technical features such as other components involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field and should not be regarded as the invention point of this utility model patent. This utility model patent will not be further elaborated.

[0043] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A high-capacity large battery cell, characterized in that: include: A plurality of core packs (1), positive poles (2) and negative poles (3) arranged in a staggered manner; A separately arranged pole piece connection assembly (4) is provided between the core packages (1); wherein The electrode connecting assembly (4) is suitable for electrically connecting the positive terminal of each core package (1) and the positive electrode column (2), and the negative terminal of each core package (1) and the negative electrode column (3).

2. The large battery cell according to claim 1, characterized in that: The core package (1) comprises a positive electrode tab (11) and a negative electrode tab (12), and the electrode piece connection assembly (4) comprises a positive electrode connection sheet (41) and a negative electrode connection sheet (42); The positive electrode connecting piece (41) sequentially connects each of the positive electrode tabs (11) and the positive electrode column (2); The negative electrode connecting piece (42) sequentially connects each of the negative electrode tabs (12) and the negative electrode column (3).

3. The large battery cell according to claim 1, characterized in that: The core packages (1) are symmetrically distributed on both sides of the pole piece connection assembly (4); Adjacent core packages (1) on the same side are arranged symmetrically.

4. The large battery cell according to claim 3, characterized in that: The number of the core packages (1) on the same side is two.

5. The large battery cell according to claim 2, characterized in that: An insulating sheet (43) is provided between the positive electrode connecting sheet (41) and the negative electrode connecting sheet (42).

6. The large battery cell according to claim 1, characterized in that: The outer sides of the positive pole (2) and the negative pole (3) are both covered with insulating rubber sleeves (13).

7. The large battery cell according to claim 1, characterized in that: A top cover (5) is provided on one side of the pole piece connection assembly (4).

8. The large battery cell according to claim 7, characterized in that: Two insulating baffles (51) are provided on the top cover (5), and the two insulating baffles (51) correspond to the positive electrode column (2) and the negative electrode column (3) respectively.

9. The large battery cell according to claim 1, characterized in that: The outer side of each core package (1) is sequentially covered with a Mylar layer (6) and an aluminum shell (7).

10. The large battery cell according to claim 9, characterized in that: The two ends of the aluminum shell (7) are respectively provided with a bottom supporting piece (71) and a top patch (72).

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