Battery cell thermal runaway structure

Abstract

The utility model relates to the technical field of battery testing, in particular to a battery cell thermal runaway structure which comprises a battery cell monomer, the battery cell monomer comprises a battery cell shell, at least two battery cells and a heating film, and the battery cells are arranged in the battery cell shell; the heating film is clamped and fixed between the two battery cells and is arranged in the middle; the utility model provides a battery cell thermal runaway structure, which solves the problem that the test result of the existing battery cell thermal runaway structure is inaccurate by changing an external large surface heating mode used for battery cell thermal runaway into a battery cell.

Description

Technical Field

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

[0002] In the new energy industry, thermal runaway testing of battery cells is a crucial step in assessing battery safety. One traditional testing method involves using an external heating film to induce thermal runaway in the battery cell. Specifically, a heating film is placed on the large surface of the individual cell, and then energized. The heat generated by the heating film is transferred to the outer casing of the cell and further to the cell inside, causing thermal runaway due to overheating. For example, a testing device for a power battery system disclosed in invention application CN113109720A employs this testing method.

[0003] However, in existing battery cell thermal runaway testing structures, the heating film is typically placed between the large surfaces of two adjacent battery cells. When these cells are assembled into a module, the large surfaces of adjacent battery cells are in close contact. Although thermal insulation is provided between the heating surface of the target battery cell and the large surface of the adjacent battery cell, the large surface of the adjacent battery cell is still heated simultaneously when the target battery cell is heated, which leads to inaccurate test results. Utility Model Content

[0004] In view of this, this utility model proposes a cell thermal runaway structure, which solves the problem of inaccurate test results of existing cell thermal runaway structures by changing the external large-area heating method used for cell thermal runaway to the inside of the cell.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides a battery cell thermal runaway structure, including a single battery cell, wherein the single battery cell includes a battery cell shell, a battery cell, and a heating film, wherein...

[0007] At least two battery cells are disposed in the battery cell casing;

[0008] The heating film is clamped and fixed between the two battery cells and is centrally positioned.

[0009] Based on the above technical solutions, preferably, the battery cell casing is provided with a through hole, wherein,

[0010] The power line of the heating film is led out from the through hole of the battery cell housing.

[0011] Based on the above technical solutions, preferably, the through hole has an annular groove on its wall.

[0012] Based on the above technical solutions, preferably, the power cord of the heating film is fixed inside the through hole by structural adhesive, and the through hole is sealed by structural adhesive.

[0013] Based on the above technical solutions, preferably, one end of the battery cell casing is provided with a battery cell top cover end plate, wherein...

[0014] The through hole is provided on the top cover end plate of the battery cell.

[0015] Based on the above technical solutions, preferably, the heating film is a PI soft heating film.

[0016] Based on the above technical solutions, preferably, the power of the heating film is no greater than 1000W and the internal resistance is no greater than 50Ω.

[0017] Based on the above technical solutions, preferably, the battery cell is a wound battery cell or a stacked battery cell.

[0018] Based on the above technical solution, preferably, two wound battery cells are provided, wherein,

[0019] A heating film is disposed between the two wound battery cells.

[0020] Based on the above technical solutions, preferably, one heating film is provided, wherein,

[0021] Several stacked battery cells are arranged on both sides of the heating film;

[0022] The number of stacked cells located on both sides of the heating film is the same.

[0023] The cell thermal runaway structure of this utility model has the following advantages over the prior art:

[0024] (1) By placing the heating film inside the individual battery cell, thermal runaway testing can be performed inside the cell, which not only improves the accuracy of the test results but also triggers thermal runaway of the cell more quickly, shortening the test time and improving test efficiency. Simultaneously, the centrally positioned heating film ensures uniform heating of the cells on both sides, resulting in more accurate test results. Furthermore, the heat generated by the centrally positioned heating film is transferred from the inside of the cell to the outside, effectively reducing the risk of thermal diffusion during the experiment and protecting adjacent cells.

[0025] (2) By setting the power line of the heating film and the through hole to be fixed with structural adhesive, and sealing the through hole with structural adhesive, the power line is conveniently fixed, while ensuring the sealing of the internal space of the cell, which is beneficial to battery safety.

[0026] (3) By setting an annular groove on the wall of the through hole, it is easier to accommodate the structural adhesive through the annular groove and the through hole, thereby improving the structural strength after the structural adhesive is cured, and making the structural adhesive better at fixing and sealing. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a perspective view of a battery cell thermal runaway structure according to the present invention;

[0029] Figure 2 This is a partial perspective view of a battery cell thermal runaway structure according to the present invention;

[0030] Figure 3 This is a schematic diagram of the combined structure of the laminated battery cell and the heating film.

[0031] In the diagram: 1. Battery cell casing; 2. Battery cell; 3. Heating film; 11. Battery cell top cover end plate; 101. Through hole. Detailed Implementation

[0032] 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.

[0033] like Figure 1-3 As shown, the present invention provides a battery cell thermal runaway structure, which includes a battery cell unit, the battery cell unit including a battery cell shell 1, a battery cell 2 and a heating film 3.

[0034] In this design, at least two battery cells 2 are disposed within the battery cell casing 1, and a heating film 3 is clamped and fixed between two battery cells 2 and centrally positioned. This allows for the internal embedding of the heating film 3. During battery cell thermal runaway testing, the heating film 3 heats only one battery cell, starting from within the cell itself, resulting in more accurate experimental results and eliminating errors. Furthermore, heating from within the cell itself triggers thermal runaway more quickly, shortening testing time and improving testing efficiency.

[0035] Furthermore, in the above structure, the heating film 3 is centrally positioned, ensuring uniform heating of the battery cells 2 on both sides of the heating film 3, thus making the test results more accurate. Moreover, the heat generated by the centrally positioned heating film 3 is transferred from the inside of the battery cell to the outside, effectively reducing the risk of heat diffusion during the experiment and protecting adjacent battery cells.

[0036] In the above-mentioned battery cell thermal runaway structure, a through hole 101 is provided on the battery cell outer shell 1 for leading out the power line of the heating film 3. Specifically, the through hole 101 is formed on the top cover end plate 11 of the battery cell, which is located at one end of the battery cell outer shell 1 and is a component of the battery cell outer shell 1.

[0037] After the power cord of the heating film 3 passes through the inside of the through hole 101 and is led out of the battery cell housing 1, structural adhesive is injected into the through hole 101 to fix the power cord to the inside of the through hole 101. At the same time, the through hole 101 is sealed by the structural adhesive.

[0038] Furthermore, the wall of the through hole 101 is provided with an annular groove, which accommodates a portion of the structural adhesive injected into the through hole 101. After the adhesive is fixed, the structural adhesive in the annular groove and the structural adhesive in the through hole 101 will form an adhesive column with a flange structure. The adhesive column of this shape has good structural strength and is not easy to fall off, which is beneficial to improving the fixing and sealing effect of the structural adhesive.

[0039] In the aforementioned thermal runaway structure of the battery cell, the heating film 3 is a PI soft heating film. Its maximum operating power is controlled within 1000W, and its internal resistance is optimally 50Ω. The external power supply can freely control the heating power of the heating film 3 by controlling the voltage.

[0040] In the above-mentioned thermal runaway structure of the battery cell, battery cell 2 is a wound battery cell or a stacked battery cell.

[0041] When cell 2 is a wound cell, two wound cells are provided, and a heating film 3 is provided between the two wound cells. The heating film 3 is located in the middle of the two wound cells, and the edge of the heating film 3 does not extend beyond the outer end of the wound cell.

[0042] When cell 2 is a laminated cell, one heating film 3 is provided, and several laminated cells are provided on both sides of the heating film 3, with the same number of laminated cells on both sides of the heating film 3. In this structure, the heating film 3 is located at the center of the laminated cells on both sides, and the edge of the heating film 3 does not extend beyond the outer end of the laminated cells.

[0043] The method of using the cell thermal runaway structure of this utility model is as follows:

[0044] When conducting thermal runaway tests on battery cells, heating film 3 is powered. Since heating film 3 is located in the center of the battery cell, heating begins from inside the battery cell, ensuring the accuracy of the experimental results. Furthermore, heating from inside the battery cell triggers thermal runaway more quickly, shortening the testing time and improving testing efficiency.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell thermal runaway structure, comprising a single battery cell, characterized in that: The battery cell unit includes a battery cell casing (1), a battery cell (2), and a heating film (3), wherein, At least two of the battery cells (2) are disposed in the battery cell casing (1); The heating film (3) is clamped and fixed between the two battery cells (2) and is centrally located.

2. The cell thermal runaway structure as described in claim 1, characterized in that: The battery cell casing (1) is provided with a through hole (101), wherein, The power line of the heating film (3) is led out from the through hole (101) of the battery cell housing (1).

3. The cell thermal runaway structure as described in claim 2, characterized in that: The power cord of the heating film (3) is fixed inside the through hole (101) by structural adhesive, and the through hole (101) is sealed by structural adhesive.

4. The cell thermal runaway structure as described in claim 3, characterized in that: The through hole (101) has an annular groove on its wall.

5. The cell thermal runaway structure as described in claim 2, characterized in that: One end of the battery cell casing (1) is provided with a battery cell top cover end plate (11), wherein, The through hole (101) is provided on the top cover end plate (11) of the battery cell.

6. The cell thermal runaway structure as described in claim 1, characterized in that: The heating film (3) is a PI soft heating film.

7. The cell thermal runaway structure as described in claim 6, characterized in that: The power of the heating film (3) is no greater than 1000W and the internal resistance is no greater than 50Ω.

8. The cell thermal runaway structure as described in claim 1, characterized in that: The battery cell (2) is a wound battery cell or a stacked battery cell.

9. The cell thermal runaway structure as described in claim 8, characterized in that: Two wound battery cells are provided, wherein... A heating film (3) is disposed between the two wound cells.

10. A cell thermal runaway structure as described in claim 8, characterized in that: One heating film (3) is provided, wherein, Several stacked battery cells are arranged on both sides of the heating film (3); The number of stacked cells located on both sides of the heating film (3) is the same.

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