Testing battery pack

Abstract

The utility model provides a test battery pack, and relates to the technical field of batteries. According to the test battery pack provided by the utility model, the target battery cell and the power supply battery cell are arranged in the accommodating space of the shell, and the target battery cell is connected with the trigger assembly, so that a thermal runaway condition can occur under the action of the trigger assembly. The power supply cell and the target cell are both arranged in the accommodating space, the power supply cell supplies power to the trigger assembly, and a power supply circuit connecting the power supply cell and the target cell does not need to be arranged in the shell in a penetrating manner, so that compared with the prior art, the test battery pack provided by the invention can improve the sealing performance of the tested battery pack, and the test efficiency is improved. Therefore, the stability and reliability of the thermal runaway experiment are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a test battery pack. Background Art

[0002] When batteries, such as lithium-ion batteries, are grouped together, the thermal runaway performance of the battery pack is one of the most important performance indicators of the battery cells. Usually, when a single battery cell is in thermal runaway, the adjacent battery cells are affected and thermal runaway is triggered simultaneously. The battery cells open their valves and emit smoke in a short period of time, and may even catch fire.

[0003] In the prior art, a simple module is used with different trigger mechanisms in a box, and the trigger mechanism is connected to a power source outside the box to trigger thermal runaway of the target cell. However, this trigger mechanism results in poor sealing performance of the box, affecting the stability and reliability of the thermal runaway experiment. Utility Model Content

[0004] In view of this, the present application provides a test battery pack, the purpose of which is to alleviate the above technical problems to a certain extent.

[0005] According to the present application, a test battery pack is provided, the test battery pack comprising:

[0006] A housing having a closable accommodation space;

[0007] A target cell is disposed in the accommodation space;

[0008] A trigger component connected to the target cell to trigger thermal runaway of the target cell;

[0009] A power supply cell is disposed in the accommodating space and electrically connected to the trigger component to supply power to the trigger component.

[0010] Preferably, there are multiple target cells, and the multiple target cells are connected in series or in parallel.

[0011] The trigger component is connected to one of the plurality of target cells.

[0012] Preferably, the power supply cell and the target cell are arranged in the accommodation space, and other cells are provided between the power supply cell and the target cell connected to the trigger component.

[0013] Preferably, the shell is in a rectangular parallelepiped shape, and the power supply core is arranged at at least some of the four corners corresponding to the four side edges of the shell.

[0014] Preferably, the test battery pack further includes:

[0015] A current output terminal disposed at the housing;

[0016] The target cell is electrically connected to the current output end and is configured to supply power to an external electrical device via the current output end.

[0017] Preferably, the target battery cell includes a battery cell shell and a plurality of winding cores arranged at intervals in the battery cell shell; the trigger assembly includes a first heating plate located in the battery cell shell of the target battery cell, the first heating plate is arranged between adjacent winding cores, and the first heating plate is electrically connected to the power supply battery cell.

[0018] Preferably, the trigger assembly further includes a plurality of second heating plates, and the plurality of second heating plates are arranged around the first heating plate.

[0019] Preferably, the first heating plate is in contact with the winding core, and the surface of the first heating plate is closed.

[0020] Preferably, the trigger assembly also includes a lead electrically connected to the first heating plate, the target battery cell includes a top cover, the top cover includes an injection hole, the lead is connected to the first heating plate, the lead is led out from the injection hole of the top cover of the target battery cell, and is connected to the power supply battery cell.

[0021] Preferably, the target battery cell has a cathode sheet, the first heating plate is rectangular, the size of one side of the first heating plate is set to the difference between the width of the cathode sheet and 8 mm, the size of the side of the first heating plate adjacent to the one side is the difference between the inner width of the battery cell shell and 12 mm, and the thickness of the first heating plate is 0.3±0.05 mm.

[0022] According to the test battery pack provided by the present application, the test battery pack arranges the target cell and the power supply cell in the accommodation space of the shell, wherein the target cell is connected to the trigger assembly, and thermal runaway can occur under the action of the trigger assembly. Both the power supply cell and the target cell are arranged in the accommodation space, and the power supply cell supplies power to the trigger assembly, and there is no need to pass the power supply line connecting the power supply cell and the target cell through the shell. Therefore, compared with the prior art, the test battery pack provided by the present application can improve the sealing performance of the tested battery pack, thereby improving the stability and reliability of the thermal runaway experiment.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a three-dimensional diagram of a test battery pack provided according to an embodiment of the present application is shown.

[0026] Figure 2 A schematic diagram of another three-dimensional diagram of a test battery pack provided according to an embodiment of the present application is shown.

[0027] Figure 3 A schematic diagram of a plane of a test battery pack provided according to an embodiment of the present application is shown.

[0028] Figure 4 A schematic diagram of a trigger assembly and a target cell of a test battery pack provided according to an embodiment of the present application is shown.

[0029] Reference numerals:

[0030] 100-housing;

[0031] 200-target battery cell; 210-battery cell shell; 220-winding core; 300-power supply battery cell;

[0032] 400 - trigger assembly; 410 - first heating plate; 420 - lead wire. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0037] According to an embodiment of the present application, a test battery pack is provided. The structure and working principle of the test battery pack will be described in detail below with reference to the accompanying drawings.

[0038] According to the test battery pack provided in the embodiment of the present application, the test battery pack includes a housing 100, a target battery cell 200, a trigger assembly 400 and a power supply battery cell 300. In an embodiment, the housing 100 has a closure space. The target battery cell 200 is disposed in the accommodating space. The trigger assembly 400 is connected to the target battery cell 200 so as to trigger thermal runaway of the target battery cell 200. The power supply battery cell 300 is disposed in the accommodating space and is electrically connected to the trigger assembly 400 for powering the trigger assembly 400.

[0039] According to the test battery pack provided in the embodiment of the present application, the test battery pack sets the target cell 200 and the power supply cell 300 in the accommodation space of the shell 100, wherein the target cell 200 is connected to the trigger assembly 400, and can cause thermal runaway under the action of the trigger assembly 400. The power supply cell 300 and the target cell 200 are both set in the accommodation space, and the power supply cell 300 supplies power to the trigger assembly 400, without the need to pass the power supply line connecting the power supply cell 300 and the target cell 200 through the shell 100. Therefore, compared with the prior art, the test battery pack provided in the embodiment of the present application can improve the sealing performance of the tested battery pack, thereby improving the stability and reliability of the thermal runaway experiment.

[0040] In an embodiment, the shape of the housing 100 may be, for example, square, that is, the housing 100 may be in the shape of a cuboid, and the housing 100 may have the above-mentioned accommodation space. In an embodiment, the accommodation space can be closed, and the "closeable" here should be understood to include the following meanings: the housing 100 includes at least two parts that can be assembled and disassembled, and the accommodation space is closed when these parts are assembled together. As an example, in an embodiment, the housing 100 may include a main body having an opening and a cover plate for closing the opening.

[0041] According to the test battery pack provided in the embodiment of the present application, there can be multiple target cells 200, and the multiple target cells 200 can be connected in series or in parallel. According to the trigger device provided in the embodiment of the present application, multiple target cells 200 are arranged in the accommodating space, so that in the accommodating space, the multiple target cells 200 are respectively at different positions, so that the thermal runaway at different positions of the shell 100 can be simulated by triggering (the "triggering" here means causing the target cell 200 to thermally runaway, the same below) the target cells 200 at different positions. In addition, according to the test battery pack provided in the embodiment of the present application, the thermal runaway of the target cells 200 at different positions can also be combined to simulate a more complex thermal runaway situation in the shell 100.

[0042] According to the test battery pack provided in the embodiment of the present application, the trigger assembly 400 can be connected to one of the multiple target cells 200 to trigger the target cell 200 .

[0043] According to the test battery pack provided in the embodiment of the present application, the power supply cell 300 and the target cell 200 can be arranged in the accommodation space.

[0044] According to the test battery pack provided by the embodiment of the present application, the power supply cell 300 and the target cell 200 are arranged in the accommodation space, so that each of the power supply cell 300 and the target cell 200 has an adjacent cell, for example, the adjacent cell of the power supply cell 300 can be the power supply cell 300 or the target cell 200, and similarly, the adjacent cell of the target cell 200 can be the power supply cell 300 or the target cell 200. Thus, the position of each of the power supply cell 300 and the target cell 200 in the accommodation space can be defined by its adjacent cell, so as to reduce the complexity of positioning the power supply cell 300 and the target cell 200 when the power supply cell 300 and the target cell 200 are set.

[0045] As an example, in an embodiment, the power supply cell 300 and the target cell 200 can be cells of the same or substantially the same size and shape. Through dimensional design, the power supply cell 300 and the target cell 200 can be arranged in an array in the accommodation space, thereby effectively improving the assembly efficiency of the test battery pack.

[0046] According to the test battery pack provided in the embodiment of the present application, other cells may be provided between the power supply cell 300 and the target cell 200 connected to the trigger assembly 400 .

[0047] As an example, in an embodiment, the test battery pack separates the target cell 200 from the power supply cell 300 by providing other cells between the power supply cell 300 and the target cell 200 connected to the trigger assembly 400. In an embodiment, the other cells may be, for example, other target cells 200, such as target cells 200 not connected to the trigger assembly 400.

[0048] According to the test battery pack provided by the embodiment of the present application, as described above, the shell 100 may be in a rectangular parallelepiped shape. The power supply cells 300 may be disposed at least in part of the four corners corresponding to the four side edges of the shell 100 .

[0049] On the basis that other battery cells are arranged between the power supply battery cell 300 and the target battery cell 200, according to the test battery pack provided in the embodiment of the present application, at least some of the above-mentioned four corners can be used to set the power supply battery cell 300. In this way, the power supply battery cell 300 arranged at the corner has less influence on the electrical connection formed between the multiple target battery cells 200, that is, the power supply battery cell 300 arranged at the corner will reduce the difficulty of realizing the electrical connection between the multiple target battery cells 200, because the multiple target battery cells 200 are at least not separated by the power supply battery cell 300 arranged at the corner.

[0050] According to the test battery pack provided in the embodiment of the present application, the test battery pack may further include a current output terminal. The current output terminal may be provided on the housing 100, and the current output terminal may be, for example, a positive terminal and a negative terminal of a cover plate provided on the housing 100. The target cell 200 may be electrically connected to the current output terminal and configured to supply power to an external electrical device via the current output terminal.

[0051] Thus, according to the test battery pack provided in the embodiment of the present application, when the test battery pack is tested, the target battery cell 200 can still be used normally and supply power to the outside. On the one hand, it can avoid the waste of electric energy in the target battery cell 200 after it fails due to thermal runaway during the test process. On the other hand, the test battery pack can simulate the working condition of thermal runaway when the battery pack supplies power to the outside, making the test process closer to the actual working condition.

[0052] According to the test battery pack provided in the embodiment of the present application, the target cell 200 may include a cell shell 210 and a plurality of spaced cores 220 located in the cell shell 210. The trigger assembly 400 may include a first heating plate 410 located in the cell shell 210 of the target cell 200, and the first heating plate 410 may be disposed between adjacent cores 220, and the first heating plate 410 may be electrically connected to the power supply cell 300.

[0053] According to the test battery pack provided in the embodiment of the present application, the first heating plate 410 is used to directly heat the winding core 220 inside the battery shell 210 of the target battery 200 to trigger the target battery 200. Therefore, before the target battery 200 is triggered, the heating process isolates the target battery 200 from the influence of the ambient temperature of the environment in which the target battery 200 is located. Compared with heating the target battery 200 from the outside of the target battery 200, the influence of the first heating plate 410 on the remaining batteries in the test battery pack is also avoided, thereby improving the reliability of the thermal runaway triggering of the test battery pack.

[0054] In addition, in the embodiment, as an example, the cell case 210 of the target cell 200 may be in a rectangular parallelepiped shape.

[0055] According to the test battery pack provided by the embodiment of the present application, the trigger assembly 400 may further include a plurality of second heating plates, and the plurality of second heating plates may be arranged around the first heating plate 410. This further improves the speed at which the trigger assembly 400 triggers the target cell 200, and enables the winding core 220 to be evenly heated.

[0056] As an example, in an embodiment, the number of the second heating plates may be, for example, two, and the two second heating plates may be disposed opposite to each other and located on both sides of the first heating plate 410 .

[0057] According to the test battery pack provided in the embodiment of the present application, the first heating plate may be in contact with the winding core 220 , and the surface of the first heating plate is closed.

[0058] Thus, according to the battery pack provided in the embodiment of the present application, the surface of the first heating plate is sealed, so as not to affect the chemical system reaction inside the target battery cell 200. In the embodiment, as an example, the surface of the first heating plate can be plastic-sealed, so as not to affect the chemical system reaction inside the target battery cell 200 and insulate from the winding core 220. In addition, the surface of the second heating plate can also be sealed, so as not to affect the chemical system reaction inside the target battery cell 200, and the surface of the second heating plate can also be, for example, plastic-sealed, so as not to affect the chemical system reaction inside the target battery cell 200 and insulate from the winding core 220.

[0059] According to the test battery pack provided in the embodiment of the present application, the trigger assembly 400 may further include a lead 420 electrically connected to the first heating plate 410, the target battery cell 200 may include a top cover, the top cover may include an injection hole, the lead 420 may be connected to the first heating plate 410, the lead 420 may be drawn out from the injection hole of the top cover of the target battery cell 200, and connected to the power supply battery cell 300. In addition, the second heating plate may also be provided with a corresponding lead 420, and drawn out from the injection hole. Here, in the embodiment, the lead 420 of the first heating plate 410 and the lead 420 of the second heating plate may both be connected to the current output terminal.

[0060] In this way, according to the test battery pack provided in the embodiment of the present application, the lead 420 can be led out from the injection hole of the top cover to the outside of the target battery cell 200, without opening an additional hole on the top cover or the battery cell shell 210 for the lead 420 to pass through or damaging the existing structure on the top cover or the battery cell shell 210, thereby ensuring the strength of the battery cell shell 210 and the top cover, and ensuring that the existing structure on the top cover or the battery cell shell 210 of the target battery cell 200 can be used normally, and the explosion-proof valve on the top cover can be used normally.

[0061] According to the test battery pack provided by the embodiment of the present application, the target cell 200 has a cathode sheet, the first heating plate is rectangular, the size of one side of the first heating plate is set to be the difference between the width of the cathode sheet and 8 mm, the size of the side of the first heating plate adjacent to the aforementioned side is the difference between the inner width of the cell shell 210 and 12 mm, and the thickness of the first heating plate is 0.3±0.05 mm. This is conducive to further uniform heating of the winding core 220.

[0062] According to the test battery pack provided in the embodiment of the present application, the number of the winding cores 220 included in the target battery cell 200 can be two. For the target battery cell 200 with such a double winding core 220 structure, three first heating plates 410 can be arranged inside the target battery cell 200, thereby presenting a double-layer sandwich structure with the double winding cores 220 (i.e., each winding core 220 has a first heating plate 410 on the outside), thereby ensuring that the entire large surface of the winding core 220 is heated evenly.

[0063] According to the test battery pack provided in the embodiment of the present application, the power control system of the test battery pack controls the trigger component 400 to be powered on. After the trigger component 400 is powered on, the three first heating plates start working at the same time, generating a large amount of heat, triggering the failure of the target battery cell 200. After the target battery cell 200 fails, a large amount of heat is generated inside the test battery pack, and the test battery pack is isolated from the influence of the ambient temperature, thereby simulating the thermal runaway phenomenon of the entire test battery pack, reacting inside the test battery pack, and collecting the results.

[0064] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A test battery pack, characterized in that: The test battery pack includes: A housing having a closable accommodation space; A target cell is disposed in the accommodation space; A trigger component connected to the target cell to trigger thermal runaway of the target cell; A power supply cell is disposed in the accommodating space and electrically connected to the trigger component to supply power to the trigger component.

2. The test battery pack according to claim 1, characterized in that: There are multiple target cells, and the multiple target cells are connected in series or in parallel with each other; The trigger component is connected to one of the plurality of target cells.

3. The test battery pack according to claim 2, characterized in that: The power supply cell and the target cell are arranged in the accommodation space, and other cells are arranged between the power supply cell and the target cell connected to the trigger component.

4. The test battery pack according to claim 3, characterized in that: The shell is in the shape of a cuboid, and the power supply core is arranged at at least some of the four corners corresponding to the four side edges of the shell.

5. The test battery pack according to any one of claims 1 to 4, characterized in that: The test battery pack also includes: A current output terminal disposed at the housing; The target cell is electrically connected to the current output end and is configured to supply power to an external electrical device via the current output end.

6. The test battery pack according to any one of claims 1 to 4, characterized in that: The target battery cell includes a battery cell shell and a plurality of winding cores arranged at intervals in the battery cell shell; the trigger assembly includes a first heating plate located in the battery cell shell of the target battery cell, the first heating plate is arranged between adjacent winding cores, and the first heating plate is electrically connected to the power supply battery cell.

7. The test battery pack according to claim 6, characterized in that: The trigger assembly further includes a plurality of second heating plates, and the plurality of second heating plates are arranged around the first heating plate.

8. The test battery pack according to claim 6, characterized in that: The first heating plate is in contact with the winding core, and a surface of the first heating plate is closed.

9. The test battery pack according to claim 6, characterized in that: The trigger assembly also includes a lead electrically connected to the first heating plate, the target battery cell includes a top cover, the top cover includes a liquid injection hole, the lead is connected to the first heating plate, the lead is led out from the liquid injection hole of the top cover of the target battery cell, and is connected to the power supply battery cell.

10. The test battery pack according to claim 6, characterized in that: The target battery cell has a cathode sheet, the first heating plate is rectangular, the size of one side of the first heating plate is set to be the difference between the width of the cathode sheet and 8 mm, the size of the side of the first heating plate adjacent to the one side is the difference between the inner width of the battery cell shell and 12 mm, and the thickness of the first heating plate is 0.3±0.05 mm.

Images