Power battery system external short circuit test method, device and electronic equipment

Abstract

The present invention provides a method, device and electronic device for testing an external short circuit of a power battery system, comprising: receiving a test instruction, and obtaining the current test temperature and the power of the power battery system to be tested based on the test instruction; judging whether the test temperature reaches a preset temperature value, and judging whether the power of the power battery system to be tested is a preset value; if the test temperature is the preset temperature value and the power of the power battery system to be tested is the preset value, short-circuit tests are performed on multiple high-voltage connectors of the power battery system to be tested respectively; when the power battery system to be tested meets the preset end condition, the short-circuit test is stopped to obtain the test result. The present invention can cover more possible safety hazard conditions and further ensure the safety of new energy vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery systems, and in particular to a method, a device and an electronic device for testing an external short circuit of a power battery system. Background Art

[0002] With the development of new energy vehicles, the power requirements are getting bigger and bigger, the performance requirements of power batteries are getting more and more diversified, and the requirements for charge and discharge rates are getting higher and higher, which leads to the difference in battery internal resistance under different power states and the difference in short-circuit current under different power states. The rated current of the main fuse configured for the large power demand of the battery pack will become larger and larger, and the fuse protection time will also become longer when a small short-circuit current is generated. There may be a failure of protection of the relay, high-voltage wiring harness and electrical components in the high-voltage circuit in the battery pack at the minimum short-circuit current, causing safety risks for the whole vehicle. The existing external short-circuit protection test conditions only stipulate that the short-circuit resistance does not exceed 5mΩ and the temperature is 20℃±10℃. There are few constraints and cannot fully cover the state of the whole vehicle use process; at the same time, because the path of the short-circuit current is unpredictable, the fault risk point may be missed during the test, resulting in the risk of protection failure during the actual use of the whole vehicle. In summary, the existing external short-circuit test method cannot be fully tested, and new energy vehicles still have safety hazards. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a method, device and electronic equipment for external short-circuit testing of a power battery system, which can cover more possible safety hazard conditions and better ensure the safety of new energy vehicles.

[0004] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for external short-circuit testing of a power battery system, comprising: receiving a test instruction, and obtaining a current test temperature and a power level of the power battery system to be tested based on the test instruction; judging whether the test temperature reaches a preset temperature value, and judging whether the power level of the power battery system to be tested is a preset value; if the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value, short-circuit testing is performed on multiple high-voltage connectors of the power battery system to be tested respectively; when the power battery system to be tested meets a preset termination condition, the short-circuit test is stopped to obtain a test result.

[0006] In one embodiment, before short-circuiting multiple high-voltage connectors of the power battery system to be tested, the method further includes: obtaining status information of contactors of the charging circuit and the discharging circuit in the power battery system to be tested; judging whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed; if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, receiving a control instruction, and closing the contactors of the charging circuit and the discharging circuit in the power battery system to be tested based on the control instruction.

[0007] In one embodiment, the steps of performing short-circuit tests on multiple high-voltage connectors of the power battery system to be tested include: for any high-voltage connector, connecting the positive terminal and the negative terminal of the high-voltage connector through a cable to perform a short-circuit test; wherein the internal resistance of the cable is less than or equal to 5 mΩ.

[0008] In one embodiment, when the power battery system to be tested meets a preset termination condition, the short-circuit test is stopped, and the step of obtaining the test result includes: receiving a first detection instruction, and based on the first detection instruction, detecting a protection device of the power battery system to be tested, and obtaining status information of the protection device; based on the status information of the protection device, determining whether the protection device is blown; if the protection device is blown, stopping the short-circuit test and obtaining the test result.

[0009] In one embodiment, when the power battery system to be tested meets the preset termination condition, the short-circuit test is stopped, and the step of obtaining the test result includes: receiving a second detection instruction, and detecting the shell temperature of the power battery system to be tested based on the second detection instruction; judging whether the shell temperature of the power battery system to be tested meets the preset temperature condition; if the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is continuously short-circuited for a first preset time, and then the short-circuit test is stopped to obtain the test result.

[0010] In one embodiment, after stopping the short-circuit test, the method further includes: placing the power battery system to be tested at the test temperature for a second preset time.

[0011] In one embodiment, the preset value of the power of the power battery system to be tested includes at least: a power value corresponding to a minimum short-circuit current and a power value corresponding to a maximum short-circuit current of the power battery system to be tested.

[0012] In a second aspect, an embodiment of the present invention provides an external short-circuit test device for a power battery system, comprising: an instruction receiving module, used to receive a test instruction, and obtain the current test temperature and the power level of the power battery system to be tested based on the test instruction; a judgment module, used to judge whether the test temperature reaches a preset temperature value, and judge whether the power level of the power battery system to be tested is a preset value; a testing module, used to perform short-circuit tests on multiple high-voltage connectors of the power battery system to be tested respectively if the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value; a stop module, used to stop the short-circuit test and obtain a test result when the power battery system to be tested meets a preset end condition.

[0013] In a third aspect, an embodiment of the present invention provides an electronic device, including a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the steps of any one of the methods provided in the first aspect above.

[0014] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the methods provided in the first aspect are executed.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] The above-mentioned power battery system external short-circuit test method, device and electronic device provided by the embodiment of the present invention first receive a test instruction, and obtain the current test temperature and the power of the power battery system to be tested based on the test instruction; then, determine whether the test temperature reaches the preset temperature value, and determine whether the power of the power battery system to be tested is the preset value; if the test temperature is the preset temperature value and the power of the power battery system to be tested is the preset value, then short-circuit test is performed on multiple high-voltage connectors of the power battery system to be tested respectively; finally, when the power battery system to be tested meets the preset end condition, the short-circuit test is stopped to obtain the test result. In the above method, the power of the power battery system to be tested is constrained during the test, and detection is performed at different power levels, which is more in line with the state of the vehicle during actual use; secondly, the above method tests multiple high-voltage connectors of the power battery system to be tested separately, which can verify the safety risk hazards caused by different design schemes for each output branch, thereby covering more possible safety hazard conditions and better ensuring the safety of new energy vehicles.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flow chart of a power battery system external short-circuit test method provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the architecture of a power battery system provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a power battery system external short-circuit test device provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] At present, the existing external short-circuit protection test conditions only stipulate that the short-circuit resistance does not exceed 5mΩ and the temperature is 20℃±10℃. There are few constraints and it cannot fully cover the state of the vehicle during use. At the same time, because the path of the short-circuit current is unpredictable, and the existing requirements do not stipulate the short-circuit path test point, at this stage, some vehicle models’ battery packs will be equipped with high-voltage circuits for outputting low-power electrical devices. If the short-circuit path is not constrained, the fault risk points will be missed during the test, resulting in the risk of protection failure during the actual use of the vehicle. In summary, the existing external short-circuit test method cannot be fully tested, and new energy vehicles still have safety hazards.

[0026] Based on this, the embodiments of the present invention provide a power battery system external short-circuit test method, device and electronic equipment, which can cover more possible safety hazard conditions and better ensure the safety of new energy vehicles.

[0027] To facilitate understanding of this embodiment, firstly, a power battery system external short circuit test method disclosed in an embodiment of the present invention is described in detail, see Figure 1 The flowchart of a power battery system external short circuit test method shown in FIG. 1 illustrates that the method mainly includes the following steps S101 to S104:

[0028] Step S101: receiving a test instruction, and obtaining the current test temperature and the power level of the power battery system to be tested based on the test instruction.

[0029] In one embodiment, the test temperature of the external short circuit test and the power of the power battery system to be tested are constrained, and the test will be performed only when the test temperature and the power of the power battery system to be tested meet the conditions. Based on this, after receiving the test instruction sent by the tester, the embodiment of the present invention needs to first collect the current test temperature and read the power of the power battery system to be tested.

[0030] Step S102: determining whether the test temperature reaches a preset temperature value, and determining whether the power level of the power battery system to be tested is a preset value.

[0031] In one embodiment, the test temperature can be compared with a preset temperature value, the power of the power battery system to be tested can be compared with the preset value, and it can be determined whether the test temperature reaches the preset temperature value, and whether the power of the power battery system to be tested is the preset value. Specifically, the preset temperature value can be 20°C ± 10°C, and the preset value of the power of the power battery system to be tested includes at least: the power value corresponding to the minimum short-circuit current and the power value corresponding to the maximum short-circuit current of the power battery system to be tested, such as: the maximum short-circuit current is 5500A@SOC99%, and the minimum short-circuit current is 2000A@SOC10%.

[0032] Step S103: If the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value, a short circuit test is performed on a plurality of high-voltage connectors of the power battery system to be tested respectively.

[0033] In one implementation, if the test temperature is a preset temperature value and the power of the power battery system to be tested is a preset value, that is, the test constraint conditions are met, then short-circuit tests can be performed on multiple high-voltage connectors of the power battery system to be tested.

[0034] See also Figure 2A schematic diagram of the architecture of a power battery system is shown, and the power battery system includes: a front drive branch (point A to the front drive high-voltage connector), a fast charge drive branch (point B to the fast charge high-voltage connector) and a rear drive branch (point C to the rear drive high-voltage connector). In order to cover and verify the safety risks caused by different design schemes for each output branch, and avoid safety accidents such as relay adhesion and wiring harness ablation caused by design selection. In this embodiment, the three branches can be short-circuited separately, and multiple tests can be performed to ensure that the positive terminal and the negative terminal on each high-voltage connector are externally short-circuited. Specifically, for any high-voltage connector, the positive terminal and the negative terminal of the high-voltage connector can be connected by a cable for a short-circuit test; wherein the internal resistance of the cable is less than or equal to 5mΩ.

[0035] Step S104: When the power battery system to be tested meets the preset end condition, the short-circuit test is stopped to obtain the test result.

[0036] In one embodiment, the short-circuit state is maintained until any of the following conditions are met, and the test can be terminated: 1) the protection function of the power battery system to be tested takes effect and terminates the short-circuit current; 2) after the shell temperature of the power battery system to be tested is stable (the temperature change is less than 4°C within 2 hours), the short circuit is continued for at least 1 hour; and then the test results are obtained, such as: the melting time of the fuse, the smoking time of the high-voltage wiring harness of each branch, etc.

[0037] The above-mentioned power battery system external short-circuit test method provided by the embodiment of the present invention constrains the power level of the power battery system to be tested during the test, and performs detection at different power levels, which is more in line with the status during the actual use of the whole vehicle; secondly, the above-mentioned method tests multiple high-voltage connectors of the power battery system to be tested separately, and can verify the safety risks and hidden dangers of each output branch due to different design schemes, thereby covering more possible safety hazard conditions and further ensuring the safety of new energy vehicles.

[0038] In order to indicate that the external short-circuit test is conducted in the driving mode and the mode that allows external charging, at the beginning of the test, the relevant main contactors for charging and discharging should be closed. Specifically, before the short-circuit test is conducted on multiple high-voltage connectors of the power battery system to be tested, the relevant main contactors for charging and discharging can be closed in the following ways, including but not limited to: first, the state information of the contactors of the charging circuit and the discharging circuit in the power battery system to be tested is obtained; then, it is determined whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed; finally, if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, a control instruction is received, and based on the control instruction, the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed.

[0039] For the above method, if the driving mode and the mode allowing external charging cannot be achieved in a single test, two or more tests may be performed.

[0040] For ease of understanding, the embodiment of the present invention further provides a specific implementation method for stopping the short-circuit test, which specifically includes the following two methods:

[0041] Method 1: First, receive a first detection instruction, and based on the first detection instruction, detect the protection device of the power battery system to be tested to obtain status information of the protection device; then, based on the status information of the protection device, determine whether the protection device is blown; finally, if the protection device is blown, stop the short-circuit test and obtain the test result.

[0042] In one embodiment, the tester can issue a first detection instruction during the test process, and the first detection instruction is used to detect the protection device (such as a fuse) of the power battery system to be tested and obtain the status information of the protection device. When the protection device plays a protective role, that is, when the fuse blows, the short-circuit current is terminated, the short-circuit test is stopped, and the test result is obtained.

[0043] Method 2: First, receive the second detection instruction, and detect the shell temperature of the power battery system to be tested based on the second detection instruction; then, determine whether the shell temperature of the power battery system to be tested meets the preset temperature condition; finally, if the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is short-circuited for a first preset time, and then the short-circuit test is stopped to obtain the test result.

[0044] In one embodiment, the tester can issue a second detection instruction during the test process, and the second detection instruction is used to detect the shell temperature of the power battery system to be tested. When the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is short-circuited for a first preset time, that is, when the change in the shell temperature of the power battery system to be tested is less than 4°C within 2 hours, the short circuit is continued for at least 1 hour, and the short-circuit test is stopped to obtain the test result.

[0045] It should be noted that, of the above two methods, only one of them needs to be met to end the short-circuit test.

[0046] Furthermore, after stopping the short-circuit test, the power battery system to be tested needs to be placed at the test temperature for a second preset time. Specifically, the power battery system to be tested can be placed at the test temperature for 1 hour to observe the state of the power battery system to be tested. If the power battery system to be tested has no leakage, shell rupture, fire or explosion, and the insulation resistance after the test is not less than 100Ω / V, it means that there is no safety hazard in the power battery system to be tested.

[0047] The above method provided by the embodiment of the present invention improves the test method, constrains the SOC state (i.e., power level) of the test object (i.e., the power battery system to be tested), and requires an external short-circuit test on the positive terminal and the negative terminal of all high-voltage connectors, thereby covering more possible safety hazard conditions and further ensuring the safety of new energy vehicles.

[0048] For ease of understanding, an embodiment of the present invention also provides a specific external short-circuit test method for a power battery system, see Table 1 for the power parameters of the 350V voltage platform pure electric vehicle drive components, i.e., the design parameters that each component of the power battery system needs to meet.

[0049] Table 1 Power parameters of pure electric vehicle drive components on 350V voltage platform

[0050]

[0051] Furthermore, according to the power parameters of the drive components, the architecture components are selected through design and development as follows:

[0052] 1. The rated voltage of the main fuse is 500V and the rated current is 700A;

[0053] 2. Cable cross-sectional area of ​​front drive branch (point A to front drive high voltage connector) 50mm 2 ;

[0054] 3. Fast charging drive branch (point B to fast charging high voltage connector) cable cross-sectional area 35mm 2 ;

[0055] 4. Rear drive branch (point C to rear drive high voltage connector) cable cross-sectional area 70mm 2 ;

[0056] 5. The rated voltage of the main positive and negative relays is 500V and the rated current is 300A.

[0057] Taking the above power battery system as the test object, before the test begins, first determine the test conditions:

[0058] (a) The test should be carried out at an ambient temperature of 20°C ± 10°C or at an ambient temperature agreed upon in the manufacturer’s specifications;

[0059] (b) At the start of the test, ensure that all protective devices that affect the function of the test object and are relevant to the test results are in normal operating condition;

[0060] (c) The manufacturer shall submit a fuse selection verification report, including fuse, contactor, connector, cable tolerance and protection curves.

[0061] Next, start the external short circuit test, which mainly includes the following (a)-(c):

[0062] (a) At the start of the test, the relevant main contactors for charging and discharging should be closed to indicate the driving mode and the mode allowing external charging. If this cannot be achieved in a single test, two or more tests should be performed;

[0063] (b) Connect the positive terminal and negative terminal of the test object to each other. If the power battery system has multiple high-voltage connector output ports, multiple tests should be performed to ensure that the positive terminal and negative terminal on each high-voltage output connector can be tested for external short circuits, and the internal resistance of the external short-circuit cable does not exceed 5mΩ;

[0064] (c) During the test, the power of the power battery system should be tested at least at two different SOC values. Specifically, the SOC value at the minimum short-circuit current and the SOC value at the maximum short-circuit current can be selected based on the fuse calibration report submitted by the manufacturer.

[0065] Among them, step (b) can cover and verify the safety risks and hidden dangers caused by different design schemes for each output branch. This method can safely avoid safety accidents such as relay adhesion and wiring harness burning caused by design selection; step (c) can cover and verify the safety risks and hidden dangers when the minimum short-circuit current and maximum short-circuit current of electric vehicles are generated.

[0066] Then, keep the short circuit state until any of the following conditions are met, and then end the test:

[0067] (a) The protection function of the object under test works and terminates the short-circuit current;

[0068] (b) After the temperature of the test object's casing stabilizes (temperature change is less than 4°C within 2 hours), continue short-circuiting for at least 1 hour.

[0069] Finally, after completing the above test steps, observe the test object at the test environment temperature for 1 hour. If the test object has no leakage, shell rupture, fire or explosion, and the insulation resistance after the test is not less than 100Ω / V, then the test object has no safety hazards.

[0070] Furthermore, after short-circuiting each branch, the following test results can be obtained. Specifically, the performance parameters of the power battery system architecture components are as follows:

[0071] 1. The maximum short-circuit current of the power battery system is 5500A@SOC99%, and the minimum short-circuit current is 2000A@SOC10%.

[0072] 2. The rated voltage of the main fuse is 500V and the rated current is 700A;

[0073] According to the characteristics of the fuse, the fusing time is 28S when the short-circuit current is 2000A, and the fusing time is 0.02S when the short-circuit current is 5500A;

[0074] 3. The cable cross-sectional area of ​​the front drive branch (point A to the front drive high voltage connector) is 50mm2;

[0075] According to the characteristics of high-voltage wiring harness, the smoke time of 50mm2 high-voltage wiring harness is 33S when the short-circuit current is 2000A, and the smoke time is 5.63S when the short-circuit current is 5500A;

[0076] 4. The cable cross-sectional area of ​​the fast charging drive branch (point B to the fast charging high-voltage connector) is 35mm2;

[0077] According to the characteristics of high-voltage wiring harness, the smoke time of 35mm2 high-voltage wiring harness is 16S when the short-circuit current is 2000A, and the smoke time is 2.36S when the short-circuit current is 5500A;

[0078] 5. The cable cross-sectional area of ​​the rear drive branch (point C to the rear drive high voltage connector) is 70mm2;

[0079] According to the characteristics of high-voltage wiring harness, the smoke time of 70mm2 high-voltage wiring harness is 67S when the short-circuit current is 2000A, and the smoke time is 10.7S when the short-circuit current is 5500A;

[0080] 6. The rated voltage of the main positive and negative relays is 500V and the rated current is 300A.

[0081] According to the relay characteristics, a short-circuit current of 2000A for 9S will cause the relay to stick, and a short-circuit current of 5500A for 0.5S will cause the relay to stick;

[0082] In summary, as the power demand of the whole vehicle increases, the rated current value of the main fuse will become larger and larger when selecting it, and there are two danger points: 1. When the battery pack has a minimum short-circuit current of 2000A, the main fuse's fuse protection time is 28S, which is much longer than the relay's adhesion duration of 9S. It cannot protect the relay and will cause damage to the relay. 2. When the battery pack has a minimum short-circuit current of 2000A, the main fuse's fuse protection time is 28S, which is much longer than the smoke time of the fast-charging branch high-voltage wiring harness of 16S. It cannot protect the fast-charging branch high-voltage wiring harness and will cause a fire in the power battery pack. Therefore, the selection of the architectural components of the power battery system can be modified based on the test results.

[0083] The above method provided by the embodiment of the present invention conditions the short-circuit test according to the actual use status of the whole vehicle, and can perform safety detection at the possible minimum short-circuit current and maximum short-circuit current of the whole vehicle, which is more in line with the status of the whole vehicle during actual use, and the external short-circuit test method has a wider coverage.

[0084] It should be noted that in all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary rather than limiting, and therefore other examples of the exemplary embodiments may have different values.

[0085] For the power battery system external short circuit test method provided in the above embodiment, the present invention also provides a power battery system external short circuit test device, see Figure 3 The schematic diagram of the structure of a power battery system external short circuit test device is shown, and the device may include the following parts:

[0086] The instruction receiving module 301 is used to receive a test instruction and obtain the current test temperature and the power level of the power battery system to be tested based on the test instruction.

[0087] The judgment module 302 is used to judge whether the test temperature reaches a preset temperature value, and to judge whether the power level of the power battery system to be tested is a preset value.

[0088] The testing module 303 is used to perform short-circuit tests on multiple high-voltage connectors of the power battery system to be tested respectively if the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value.

[0089] The stop module 304 is used to stop the short-circuit test and obtain the test result when the power battery system to be tested meets the preset end condition.

[0090] The above-mentioned power battery system external short-circuit test device provided by the embodiment of the present invention constrains the power level of the power battery system to be tested during the test, and performs detection at different power levels, which is more in line with the status during actual use of the whole vehicle; secondly, the above-mentioned method tests multiple high-voltage connectors of the power battery system to be tested separately, and can verify the safety risks and hidden dangers of each output branch due to different design schemes, thereby covering more possible safety hazard conditions and further ensuring the safety of new energy vehicles.

[0091] In one embodiment, the above-mentioned device also includes a control module, which is used to: obtain status information of contactors of the charging circuit and the discharging circuit in the power battery system to be tested; determine whether the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed; if the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, receive a control instruction, and based on the control instruction, close the contactors of the charging circuit and the discharging circuit in the power battery system to be tested.

[0092] In one embodiment, the test module 303 is further used to: for any high-voltage connector, connect the positive terminal and the negative terminal of the high-voltage connector via a cable to perform a short circuit test; wherein the internal resistance of the cable is less than or equal to 5 mΩ.

[0093] In one embodiment, the stop module 304 is further used to: receive a first detection instruction, and detect a protection device of the power battery system to be tested based on the first detection instruction to obtain status information of the protection device; based on the status information of the protection device, determine whether the protection device is blown; if the protection device is blown, stop the short-circuit test and obtain the test result.

[0094] In one embodiment, the stop module 304 is further used to: receive a second detection instruction, and detect the shell temperature of the power battery system to be tested based on the second detection instruction; determine whether the shell temperature of the power battery system to be tested meets a preset temperature condition; if the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is short-circuited for a first preset time, and then the short-circuit test is stopped to obtain a test result.

[0095] In one embodiment, the stop module 304 is further configured to place the power battery system to be tested at the test temperature for a second preset time.

[0096] In one embodiment, the preset value of the power of the power battery system to be tested at least includes: a power value corresponding to a minimum short-circuit current and a power value corresponding to a maximum short-circuit current of the power battery system to be tested.

[0097] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0098] An embodiment of the present invention further provides an electronic device. Specifically, the electronic device includes a processor and a storage device. The storage device stores a computer program, and when the computer program is executed by the processor, it executes the method described in any one of the above implementation methods.

[0099] Figure 4 A structural diagram of an electronic device provided in an embodiment of the present invention, the electronic device 100 includes: a processor 400, a memory 401, a bus 402 and a communication interface 403, wherein the processor 400, the communication interface 403 and the memory 401 are connected via the bus 402; the processor 400 is used to execute an executable module stored in the memory 401, such as a computer program.

[0100] The memory 401 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 403 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0101] The bus 402 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0102] Among them, the memory 401 is used to store programs, and the processor 400 executes the program after receiving the execution instruction. The method executed by the device for flow process definition disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 400, or implemented by the processor 400.

[0103] The processor 400 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 400. The above processor 400 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 401, and the processor 400 reads the information in the memory 401 and completes the steps of the above method in combination with its hardware.

[0104] The computer program product of the readable storage medium provided in the embodiment of the present invention includes a computer-readable storage medium storing program code, and the instructions included in the program code can be used to execute the methods described in the previous method embodiments. The specific implementation can be referred to the previous method embodiments, which will not be repeated here.

[0105] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0106] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A power battery system external short circuit test method, characterized in that: include: Receiving a test instruction, and obtaining a current test temperature and a power level of the power battery system to be tested based on the test instruction; Determining whether the test temperature reaches a preset temperature value, and determining whether the power level of the power battery system to be tested is a preset value; If the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value, short-circuit tests are performed on multiple high-voltage connectors of the power battery system to be tested respectively; When the power battery system to be tested meets a preset end condition, stopping the short-circuit test and obtaining a test result; When the power battery system to be tested meets a preset termination condition, the short-circuit test is stopped to obtain a test result, comprising: receiving a first detection instruction, and detecting a protection device of the power battery system to be tested based on the first detection instruction to obtain status information of the protection device; judging whether the protection device is blown based on the status information of the protection device; if the protection device is blown, stopping the short-circuit test to obtain a test result; When the power battery system to be tested meets the preset end condition, the short-circuit test is stopped to obtain the test result, including: receiving a second detection instruction, and detecting the shell temperature of the power battery system to be tested based on the second detection instruction; judging whether the shell temperature of the power battery system to be tested meets the preset temperature condition; if the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is continuously short-circuited for a first preset time, and then the short-circuit test is stopped to obtain the test result.

2. The method according to claim 1, characterized in that Before respectively performing short-circuit tests on a plurality of high-voltage connectors of the power battery system to be tested, the method further includes: Acquiring status information of contactors of a charging circuit and a discharging circuit in the power battery system to be tested; Determining whether contactors of a charging circuit and a discharging circuit of the power battery system to be tested are closed; If the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are not closed, a control instruction is received, and based on the control instruction, the contactors of the charging circuit and the discharging circuit in the power battery system to be tested are closed.

3. The method according to claim 1, characterized in that The step of respectively performing short-circuit tests on a plurality of high-voltage connectors of the power battery system to be tested comprises: For any of the high-voltage connectors, a short circuit test is performed by connecting the positive terminal and the negative terminal of the high-voltage connector via a cable; wherein the internal resistance of the cable is less than or equal to 5 mΩ.

4. The method according to claim 1, characterized in that After stopping the short circuit test, the method further includes: The power battery system to be tested is placed at the test temperature for a second preset time.

5. The method according to claim 1, characterized in that The preset value of the power quantity of the power battery system to be tested includes at least: a power quantity value corresponding to a minimum short-circuit current and a power quantity value corresponding to a maximum short-circuit current of the power battery system to be tested.

6. A power battery system external short circuit test device, characterized in that: include: An instruction receiving module, used to receive a test instruction and obtain the current test temperature and the power of the power battery system to be tested based on the test instruction; A judgment module, used to judge whether the test temperature reaches a preset temperature value, and to judge whether the power of the power battery system to be tested is a preset value; A test module, configured to perform short-circuit tests on a plurality of high-voltage connectors of the power battery system to be tested respectively if the test temperature is a preset temperature value and the power level of the power battery system to be tested is a preset value; A stop module, used to stop the short-circuit test and obtain a test result when the power battery system to be tested meets a preset end condition; The stop module is further used to: receive a first detection instruction, and detect the protection device of the power battery system to be tested based on the first detection instruction to obtain status information of the protection device; Based on the status information of the protection device, determining whether the protection device is blown; if the protection device is blown, stopping the short circuit test and obtaining a test result; The stop module is further used to: receive a second detection instruction, and detect the shell temperature of the power battery system to be tested based on the second detection instruction; and determine whether the shell temperature of the power battery system to be tested meets a preset temperature condition; If the shell temperature of the power battery system to be tested meets the preset temperature condition, the high-voltage connector is short-circuited for a first preset time, and then the short-circuit test is stopped to obtain a test result.

7. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are executed.

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