High-voltage battery thermal runaway test device

Abstract

The high-voltage battery thermal runaway test device disclosed by the utility model comprises a high-voltage battery, the high-voltage battery comprises a battery shell and a plurality of battery modules, the plurality of battery modules are arranged in the battery shell, and the plurality of battery modules are sequentially connected in series; the voltage acquisition device comprises a first acquisition channel, a second acquisition channel and a third acquisition channel, the input end of the first acquisition channel is connected with the positive electrode of the high-voltage battery, and the output end of the first acquisition channel is connected with the negative electrode of the high-voltage battery; the input end of the second acquisition channel is connected with the positive electrode of the high-voltage battery, the output end of the second acquisition channel is connected with the battery shell, the input end of the third acquisition channel is connected with the negative electrode of the high-voltage battery, and the output end of the third acquisition channel is connected with the negative electrode of the high-voltage battery.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal diffusion test equipment, in particular to a high-voltage battery thermal runaway test device. Background Art

[0002] With the rapid development of electric vehicles, safety issues such as spontaneous combustion in lithium-ion electric vehicles have become increasingly prominent. For example, most current power battery systems use high-nickel ternary lithium-ion batteries. When a battery cell experiences thermal runaway, a large amount of high-temperature gas and heat is released, which can easily cause insulation failure of the electrical connections within the battery pack. The ejected high-temperature charged particles can easily cause arcing and short circuits in the electrical connections within the battery pack, resulting in a large amount of instantaneous energy release, causing fire in the battery pack and harming passengers. To ensure passenger safety, the current national standard "Safety Requirements for Power Batteries for Electric Vehicles" has clear testing requirements for the thermal diffusion performance of power batteries.

[0003] Currently, the industry primarily monitors dynamic data during power battery thermal diffusion testing through effective methods such as video capture, temperature acquisition, battery management system monitoring, and triggering single cell voltage acquisition. However, none of these monitoring methods accurately capture the timing and location of system short circuits and arcing. During testing, high-voltage arcing frequently occurs, reacts rapidly, and causes significant damage to the system, directly leading to failure of the battery pack's structural seal and subsequent intense flames. Utility Model Content

[0004] To address at least one aspect of the above-mentioned problems, the present invention provides a high-voltage battery thermal runaway test device, comprising: a high-voltage battery, wherein the high-voltage battery comprises a battery housing and a plurality of battery modules, wherein the plurality of battery modules are arranged in the battery housing and are sequentially connected in series; a voltage acquisition device, wherein the voltage acquisition device comprises a first acquisition channel, a second acquisition channel, and a third acquisition channel, wherein the input end of the first acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the first acquisition channel is connected to the negative electrode of the high-voltage battery, the input end of the second acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the second acquisition channel is connected to the battery housing, the input end of the third acquisition channel is connected to the negative electrode of the high-voltage battery, and the output end of the third acquisition channel is connected to the negative electrode of the high-voltage battery.

[0005] Preferably, each of the plurality of battery modules includes a plurality of battery cells.

[0006] Preferably, each of the plurality of battery modules has the same number of battery cells.

[0007] Preferably, the plurality of battery modules are connected in series in sequence via high-voltage copper busbars.

[0008] Preferably, the voltage acquisition device further includes a processor and a memory, the processor is connected to the first acquisition channel, the second acquisition channel and the third acquisition channel respectively, the memory is connected to the processor, and the memory is used to store voltage values.

[0009] Preferably, the voltage acquisition device further comprises a display, and the display is used to display the voltage values ​​of the first acquisition channel, the second acquisition channel and the third acquisition channel.

[0010] The high-voltage battery thermal runaway test device of the embodiment of the present utility model has the following beneficial effects: the device can effectively monitor the working status of the high-voltage circuit of the battery system during the thermal diffusion test of the power battery, timely capture the time and specific location of conductivity between the components and the shell in the high-voltage circuit, effectively restore the dynamic process of the high-voltage circuit during the test, and facilitate test result analysis and system solution optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and do not limit the scope of the present invention in any way, and that the components in the drawings are not drawn to scale.

[0012] Figure 1 A schematic diagram of the circuit structure of a high-voltage battery thermal runaway test device according to an embodiment of the present utility model is shown;

[0013] Figure 2 A schematic diagram of an application scenario of a high-voltage battery thermal runaway test device according to an embodiment of the present invention is shown;

[0014] Figure 3 A schematic diagram of another application scenario of the high-voltage battery thermal runaway test device according to an embodiment of the present utility model is shown;

[0015] Figure 4 A schematic diagram showing voltage waveforms in application scenarios of a high-voltage battery thermal runaway test device according to an embodiment of the present invention is shown.

[0016] Reference numerals:

[0017] 1. Battery housing; 2. Battery module; 3. High-voltage connecting copper bus; 4. Sampling harness; 5. Voltage acquisition device. DETAILED DESCRIPTION

[0018] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0019] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0020] To at least partially address one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure provides a high-voltage battery thermal runaway test device, comprising: a high-voltage battery and a voltage acquisition device 5, wherein the high-voltage battery comprises a battery housing and a plurality of battery modules 2, wherein the plurality of battery modules 2 are disposed within a battery housing 1 and are sequentially connected in series; the voltage acquisition device 5 comprises a first acquisition channel, a second acquisition channel, and a third acquisition channel, wherein the input end of the first acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the first acquisition channel is connected to the negative electrode of the high-voltage battery, the input end of the second acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the second acquisition channel is connected to the battery housing 1, the input end of the third acquisition channel is connected to the negative electrode of the high-voltage battery, and the output end of the third acquisition channel is connected to the negative electrode of the high-voltage battery.

[0021] Specifically, if Figure 1 As shown, the battery housing 1 of the high-voltage battery is a sealed structure. The positive electrode and the negative electrode of the high-voltage battery are arranged on the battery housing 1, and the battery housing 1 is grounded.

[0022] The voltage acquisition device 5 includes at least three acquisition channels and an oscilloscope. Each acquisition circuit of the voltage acquisition device 5 is electrically connected to the oscilloscope to display the voltage value of each acquisition channel. The voltage value displayed on the oscilloscope can be used to determine the status of the high-voltage battery in real time.

[0023] The first acquisition channel connects the positive and negative electrodes of the high-voltage battery to collect the voltage of the high-voltage battery. The second acquisition channel connects the positive electrode of the high-voltage battery to the battery housing 1 to collect the voltage between the positive electrode of the high-voltage battery and the battery housing 1. The third acquisition channel connects the negative electrode of the high-voltage battery to the battery housing 1 to collect the voltage between the negative electrode of the high-voltage battery and the battery housing 1.

[0024] Each acquisition channel of the voltage acquisition device 5 is connected to the high-voltage battery through a sampling harness 4 , and the sampling harness 4 is covered with high-temperature resistant insulating protective tape or other protective materials to prevent the sampling harness 4 from being damaged during the experiment.

[0025] Example 1, as Figure 2 and Figure 4 As shown, assuming that the No. 30 battery cell of the M4 module is the triggering battery cell, after the thermal runaway is triggered, the high-temperature conductive particles ejected from the battery cell will directly cause the triggering battery cell to conduct to the battery case 1, as shown below Figure 2 So the monitoring results of the three high-voltage circuits of the high-voltage circuit change as shown above. Figure 4 As shown (T1-T2), the exact time and location when the system triggers thermal runaway can be accurately detected.

[0026] As the trial continues, Figure 3 and Figure 4 As shown, if the high-temperature conductive particles ejected from the thermal runaway cell splash onto other high-voltage connection areas, causing two points in the high-voltage circuit to form unreliable electrical connections to the shell at the same time, a momentary short circuit occurs, as shown below. Figure 3 The monitoring results of the three high-voltage circuits of the high-voltage circuit change as shown in Figure 4 As shown (T2-T3), the exact time and specific location of the high-voltage short circuit in the system can be accurately detected.

[0027] In some embodiments, each of the plurality of battery modules 2 includes a plurality of battery cells.

[0028] Specifically, if Figure 1-Figure 3 As shown, each of the multiple battery modules 2 of the high-voltage battery includes multiple battery cells. The number of battery cells in each battery module 2 can be arbitrarily set according to the actual needs of the high-voltage battery.

[0029] In some embodiments, each battery module 2 in the plurality of battery modules 2 has the same number of battery cells.

[0030] Specifically, if Figure 1-Figure 3In the example of the high-voltage battery, multiple battery modules 2, from battery module 2M1 to battery module 2M12, each battery module 2 has the same number of battery cells of 8. In other embodiments, the number of battery modules 2 and the number of battery cells can be selected and set according to specific actual needs.

[0031] In some embodiments, multiple battery modules 2 are sequentially connected in series via high-voltage copper busbars 3 .

[0032] Specifically, the module positive electrode and the module negative electrode of each battery module 2 of the plurality of battery modules 2 are electrically connected via a high-voltage copper busbar 3. The high conductivity, high current carrying capacity, and good heat dissipation performance of the high-voltage copper busbar 3 can increase the stability of the high-voltage battery.

[0033] In some embodiments, the voltage acquisition device 5 further includes a processor and a memory. The processor is connected to the first acquisition channel, the second acquisition channel, and the third acquisition channel respectively. The memory is connected to the processor and is used to store voltage values.

[0034] Specifically, the voltage acquisition device 5 includes a processor and a memory. The processor is used to receive and convert the voltages of each connected acquisition channel. The memory receives and stores the voltage values ​​of each channel collected by the voltage acquisition device 5 to facilitate query and comparison of the timing voltage of the high-voltage battery.

[0035] In some embodiments, the voltage acquisition device 5 further includes a display, which is used to display the voltage values ​​of the first acquisition channel, the second acquisition channel, and the third acquisition channel.

[0036] Specifically, the display is electrically connected to the processor, and the display receives the voltage values ​​of the first acquisition channel, the second acquisition channel, and the third acquisition channel through the processor and outputs them for display.

[0037] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand this document.

Claims

1. A high-voltage battery thermal runaway test device, characterized in that: include: A high-voltage battery, comprising a battery housing and a plurality of battery modules, wherein the plurality of battery modules are disposed within the battery housing and are sequentially connected in series; A voltage acquisition device includes a first acquisition channel, a second acquisition channel, and a third acquisition channel. The input end of the first acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the first acquisition channel is connected to the negative electrode of the high-voltage battery, the input end of the second acquisition channel is connected to the positive electrode of the high-voltage battery, the output end of the second acquisition channel is connected to the battery housing, the input end of the third acquisition channel is connected to the negative electrode of the high-voltage battery, and the output end of the third acquisition channel is connected to the negative electrode of the high-voltage battery.

2. The device according to claim 1, characterized in that Each of the plurality of battery modules includes a plurality of battery cells.

3. The device according to claim 2, characterized in that Each of the plurality of battery modules has the same number of battery cells.

4. The device according to claim 1, characterized in that The plurality of battery modules are connected in series in sequence via high-voltage copper busbars.

5. The device according to claim 1, characterized in that The voltage acquisition device further includes a processor and a memory. The processor is respectively connected to the first acquisition channel, the second acquisition channel, and the third acquisition channel. The memory is connected to the processor and is used to store voltage values.

6. The device according to claim 5, characterized in that The voltage acquisition device further includes a display, which is used to display the voltage values ​​of the first acquisition channel, the second acquisition channel, and the third acquisition channel.

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