Battery cell structure

Abstract

The utility model relates to the technical field of cylindrical battery cells, in particular to a battery cell structure, which comprises a cylindrical battery cell tab, an overflowing sheet and an insulating elastomer, the cylindrical battery cell tab penetrates through a cylindrical battery cell cover plate to the outside of a battery cell shell; the overflowing sheet is pressed and fixed at the outer end of the pole lug of the cylindrical battery core through the insulating elastic body; the utility model provides a battery cell structure which is characterized in that a cylindrical battery cell tab extends out of a battery cell shell and then is connected with an overcurrent sheet, so that a roll core with a larger size can be accommodated in the battery cell shell, the energy density of a finished cylindrical battery cell can be effectively improved, and the problem that the energy density of an existing cylindrical battery cell is relatively low is solved.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery cell technology, and in particular to a battery cell structure. Background Technology

[0002] In current cylindrical battery cell manufacturing processes, the traditional method involves first flattening the coiled electrode tabs inside the cell, and then welding the adapter pieces to these tabs. Next, the adapter pieces are welded to the cell's terminals.

[0003] The utility model disclosed in publication (announcement) number CN201820827U is a plastic-shell wound lithium-ion battery adapter device, in which the battery cell tabs led out from the core are connected to "L"-shaped adapter tabs, and the "L"-shaped adapter tabs are connected to the terminals.

[0004] As described above, the internal space of the existing cylindrical battery cell is occupied by the adapter plate, resulting in a smaller core size inside the cylindrical battery cell, which in turn leads to a lower energy density of the finished cylindrical battery cell. To solve the above technical problems, it is necessary to provide a battery cell structure. Utility Model Content

[0005] In view of this, the present invention proposes a cell structure that connects a current-carrying plate after the cylindrical cell tab extends out of the cell shell, so that the inside of the cell shell can accommodate a larger-sized core, which can effectively improve the energy density of the finished cylindrical cell and solve the problem of low energy density of existing cylindrical cells.

[0006] The technical solution of this utility model is implemented as follows:

[0007] This utility model provides a battery cell structure, including cylindrical battery cell tabs, current-carrying plates, and an insulating elastomer, wherein...

[0008] The cylindrical cell tabs penetrate through the cylindrical cell cover plate to the outside of the cell casing;

[0009] The current-passing plate is pressed and fixed to the outer end of the cylindrical cell tab by the insulating elastomer.

[0010] Based on the above technical solutions, preferably, the outer end of the cylindrical cell cover plate is injection-molded with a hot melt adhesive step, wherein,

[0011] The hot melt adhesive step is hollow;

[0012] The cylindrical battery cell tab penetrates the hollow of the hot melt adhesive step.

[0013] Based on the above technical solutions, preferably, the hot melt adhesive step injection molding is in the shape of a frustum.

[0014] Based on the above technical solutions, preferably, the cylindrical battery cell tab and the cylindrical battery cell cover plate are fixedly connected by the hot melt adhesive step.

[0015] Based on the above technical solutions, preferably, a through hole is provided at the center of the cylindrical cell cover plate, wherein,

[0016] The through hole is coaxially arranged with the hollow part of the hot melt adhesive step;

[0017] The cylindrical battery cell tabs penetrate the cylindrical battery cell cover plate through the through hole.

[0018] Based on the above technical solutions, preferably, the insulating elastomer is columnar, wherein,

[0019] One end of the insulating elastomer is fixedly connected to the outer end of the cylindrical cell cover plate, and the other end is fixedly connected to one end of the current-passing plate.

[0020] Based on the above technical solutions, preferably, the insulating elastomer is provided in multiple forms, wherein...

[0021] The plurality of insulating elastomers are arranged in a circumferential ring along the tabs of the cylindrical battery cell.

[0022] Based on the above technical solutions, preferably, the cylindrical cell cover plate and the current-passing plate are coaxially arranged.

[0023] Based on the above technical solution, preferably, a groove is provided on one end of the current-passing plate near the cylindrical cell cover plate, wherein,

[0024] The outer end of the cylindrical battery cell tab is positioned in the sink.

[0025] Based on the above technical solutions, preferably, the outer end of the cylindrical battery cell tab has a conical structure.

[0026] The battery cell structure of this utility model has the following advantages over the prior art:

[0027] (1) By extending the cylindrical cell tabs out of the cell housing and connecting them to the current-carrying plates, the internal space of the cell housing does not need to be set with adapter plates, thus freeing up more internal space. Therefore, the cell housing can accommodate larger-sized winding cores, which can effectively improve the energy density and cell group margin of the finished cylindrical cell.

[0028] (2) By setting the current-carrying plate to be pressed and fixed on the outer end of the cylindrical cell tab by the insulating elastomer, the current-carrying plate and the cylindrical cell tab do not need to be welded and fixed, which simplifies the production process and can effectively improve the production efficiency of the cylindrical cell.

[0029] (3) By setting a hot melt adhesive step to fix the cylindrical battery cell tabs and the cylindrical battery cell cover plate together, it is convenient to fix the cylindrical battery cell tabs through this structure, and at the same time enhance the sealing between the cylindrical battery cell tabs and the cylindrical battery cell cover plate. Moreover, the hot melt adhesive step is pre-made on the outer end of the cylindrical battery cell cover plate by injection molding, so no additional glue dispensing operation is required when fixing the cylindrical battery cell tabs, which can effectively improve the production efficiency of cylindrical batteries.

[0030] (4) By setting the outer end of the cylindrical battery cell tab in the sink, it is convenient to install and position the cylindrical battery cell tab and improve the stability of the cylindrical battery cell tab after it is connected to the current plate. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a perspective view of a battery cell structure according to the present invention;

[0033] Figure 2 This is a partial perspective view of a battery cell structure according to the present invention;

[0034] In the diagram: 1. Cylindrical cell tab; 2. Current-passing plate; 3. Insulating elastomer; 4. Cylindrical cell cover plate; 5. Cell casing; 201. Sink; 401. Hot melt adhesive step; 402. Through hole. Detailed Implementation

[0035] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] like Figure 1-2 As shown, a battery cell structure of this utility model includes a cylindrical battery cell tab 1, a current-carrying plate 2, and an insulating elastomer 3.

[0037] In this structure, the cylindrical cell tab 1 penetrates through the cylindrical cell cover plate 4 to the outside of the cell housing 5; the current-carrying plate 2 is pressed and fixed to the outer end of the cylindrical cell tab 1 by an insulating elastomer 3. In this structure, the length of the cylindrical cell tab 1 is increased so that it can penetrate through the cylindrical cell cover plate 4 and extend out of the cell housing 5. One end of the extended cylindrical cell cover plate 4 is the outer end, which is held against the current-carrying plate 2 by the elastic force of the insulating elastomer 3. This structure eliminates the need for an adapter plate inside the cell housing 5, freeing up internal space. This allows for the housing to accommodate larger-sized cores, effectively improving the energy density and cell group margin of the finished cylindrical cell. The core is not shown in the illustration.

[0038] The current-carrying plate 2, the insulating elastomer 3, and the cylindrical cell cover plate 4 are an integral structure, which is prefabricated in the factory. When in use, the length of the cylindrical cell tab 1 extending out of the cell shell 5 is greater than the distance between the current-carrying plate 2 and the cylindrical cell cover plate 4, so that the insulating elastomer 3 can be stretched. Then, the current-carrying plate 2 is pressed and fixed on the outer end of the cylindrical cell tab 1 by the elastic force of the stretched insulating elastomer 3.

[0039] A hot melt adhesive step 401 is pre-formed on the outer end of the cylindrical cell cover plate 4. The hot melt adhesive step 401 is formed by injection molding in the factory. At room temperature, the injection-molded hot melt adhesive step 401 solidifies into a frustum shape with a hollow center. The frustum-shaped hot melt adhesive step 401 facilitates smooth demolding during injection molding, while the hollow center of the hot melt adhesive step 401 is used for the penetration of the cylindrical cell tab 1.

[0040] A through hole 402 is provided at the axial center of the cylindrical cell cover plate 4, wherein the through hole 402 is coaxially arranged with the hollow part of the hot melt adhesive step 401; the cylindrical cell tab 1 passes through the through hole 402 through the cylindrical cell cover plate 4. Specifically, when installing the cylindrical cell tab 1, the cylindrical cell tab 1 is passed through the through hole 402 and then through the hollow part of the hot melt adhesive step 401.

[0041] After the flow plate 2 is pressed and fixed onto the cylindrical cell tab 1, the hot melt adhesive step 401 is remelted into hot melt adhesive. This hot melt adhesive is then used to seal the through hole 402 and bond the cylindrical cell tab 1 to the cylindrical cell cover plate 4. Once the hot melt adhesive has cured again, the through hole 402 is sealed and the cylindrical cell tab 1 is fixed. This process eliminates the need for additional dispensing and welding of adapter plates, simplifying the production process and effectively improving the production efficiency of cylindrical cells.

[0042] The insulating elastomer 3 is cylindrical and made of elastic rubber. One end of the insulating elastomer 3 is fixedly connected to the outer end of the cylindrical cell cover plate 4, and the other end is fixedly connected to one end of the current-passing plate 2. Figure 1As shown, multiple insulating elastomers 3 are arranged in a ring array along the circumference of the cylindrical cell tab 1. The multiple insulating elastomers 3 enhance the rebound force, making the connection between the current-carrying plate 2 and the cylindrical cell tab 1 more stable and secure.

[0043] The cylindrical cell cover plate 4 is coaxially arranged with the current-carrying plate 2, and a groove 201 is provided on the end of the current-carrying plate 2 near the cylindrical cell cover plate 4. The outer end of the cylindrical cell tab 1 is placed in the groove 201. Specifically, the outer end of the cylindrical cell tab 1 has a conical structure, with the large-diameter end of the conical structure abutting against the bottom of the groove 201, and the small-diameter end near the cylindrical cell cover plate 4. This structure facilitates the installation and positioning of the cylindrical cell tab 1 and improves the stability of the connection between the cylindrical cell tab 1 and the current-carrying plate 2.

[0044] The above-mentioned cell structure is mainly used in cylindrical cells. The cylindrical cell tab 1 is used as the positive and negative tabs of the winding core. The positive and negative tabs of the winding core are assembled using the above-mentioned cell structure.

[0045] In practical applications, the core typically has several positive and negative tabs. These positive and negative tabs form a cylindrical structure following the wound core, thus forming a cylindrical cell tab 1 with positive polarity and a cylindrical cell tab 1 with negative polarity.

[0046] After the core is embedded into the cell housing 5, a cylindrical cell cover plate 4 is set at each end of the cell housing 5. During the process, the cylindrical cell tabs 1 with positive and negative polarities are passed through the hollow of the corresponding through holes 402 and hot melt adhesive steps 401 to reach the outside of the cell housing 5. Then, the inner diameter of the outer end of the cylindrical cell tab 1 is expanded to form a conical structure at the outer end of the cylindrical cell tab 1. The large-diameter end of the conical structure is placed into the groove 201, and then the cylindrical cell cover plate 4 is welded to the end of the cell housing 5.

[0047] After welding, the current-carrying plate 2 is pressed and fixed to the outer end of the cylindrical cell tab 1 by the rebound force of the insulating elastomer 3. Then, the hot melt adhesive step 401 is hot melted to obtain hot melt adhesive, which is used to seal the through hole 402. After the hot melt adhesive is re-cured, the through hole 402 is sealed and the cylindrical cell tab 1 is fixed.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell structure, comprising cylindrical battery cell tabs (1), characterized in that: It also includes a flow plate (2) and an insulating elastomer (3), wherein, The cylindrical cell tab (1) extends through the cylindrical cell cover plate (4) to the outside of the cell shell (5); The current-passing plate (2) is pressed and fixed on the outer end of the cylindrical battery cell tab (1) by the insulating elastomer (3); A hot melt adhesive step (401) is injection molded on the outer end of the cylindrical cell cover plate (4), wherein the hot melt adhesive step (401) is hollow; the cylindrical cell tab (1) penetrates the hollow of the hot melt adhesive step (401); A through hole (402) is provided at the center of the cylindrical cell cover plate (4), wherein the through hole (402) is coaxially arranged with the hollow hot melt adhesive step (401); the cylindrical cell tab (1) passes through the cylindrical cell cover plate (4) through the through hole (402); The flow plate (2) is provided with a groove (201) at one end near the cylindrical cell cover plate (4), wherein the outer end of the cylindrical cell tab (1) is disposed in the groove (201).

2. The cell structure as described in claim 1, characterized in that: The hot melt adhesive step (401) is injection molded into a frustum shape.

3. The cell structure as described in claim 1, characterized in that: The cylindrical battery cell tab (1) and the cylindrical battery cell cover plate (4) are fixedly connected by the hot melt adhesive step (401).

4. The cell structure as described in claim 1, characterized in that: The insulating elastomer (3) is columnar, wherein, One end of the insulating elastomer (3) is fixedly connected to the outer end of the cylindrical cell cover plate (4), and the other end is fixedly connected to one end of the current-passing plate (2).

5. A cell structure as described in claim 1, characterized in that: The insulating elastomer (3) is provided in multiple forms, among which, Multiple insulating elastomers (3) are arranged in a circumferential ring along the cylindrical battery tab (1).

6. A cell structure as described in claim 1, characterized in that: The cylindrical cell cover plate (4) is coaxially arranged with the current-passing plate (2).

7. A cell structure as described in claim 1, characterized in that: The outer end of the cylindrical battery cell tab (1) has a conical structure.

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