Detection system and detection equipment

Abstract

The utility model discloses a detection system and detection equipment, and relates to the technical field of battery detection. The device can be used for detecting the battery PACK, the application environment of the battery PACK is simulated through the capacitive load, and when the battery PACK is communicated with the capacitive load, transient current detection under a short circuit function is realized through the external current detection assembly, so that the detection of the battery PACK is realized according to the detected current, the detection process of the transient current is simple, the detection efficiency is improved, and the detection cost is reduced. And the method is more suitable for the detection of the battery PACK in mass production.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, and more specifically, to a detection system and detection equipment. Background Art

[0002] A battery pack is a product that combines multiple battery cells into a battery module and installs a battery management system based on specific requirements. Battery packs are designed to provide higher voltage and capacity, and are equipped with a battery management system to ensure safety and efficiency. Battery packs play a crucial role in modern energy storage and supply, particularly in electric vehicles and renewable energy storage systems. They are also used in a variety of fields, including aerospace and power tools.

[0003] Battery pack testing includes pre-charge function and / or short-circuit function testing, but existing testing is usually implemented using an oscilloscope and a current gun. The operation process is cumbersome and complicated, and requires operators to have certain operating skills, which reduces testing efficiency. Utility Model Content

[0004] In view of this, the present invention provides a detection system and detection equipment, which effectively solve the technical problems existing in the prior art, improve the detection efficiency, and are more suitable for the detection of mass-produced battery PACKs.

[0005] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0006] A detection system includes an external detection unit and a capacitive load; the external detection unit includes an external current detection component;

[0007] The first end of the external current detection component is electrically connected to the detection current output end, the second end of the external current detection component is electrically connected to the first end of the capacitive load, and the second end of the capacitive load is electrically connected to the detection current input end.

[0008] Optionally, the external detection unit further includes: an external processor;

[0009] Furthermore, the external detection unit further includes: an external switch circuit, the external switch circuit including at least one external switch; when the external switch circuit includes a plurality of external switches, the plurality of external switches are connected in series; the first end of the external current detection component is electrically connected to the detection current output end through the external switch circuit;

[0010] The first end of the external switch circuit is electrically connected to the detection current output end, the second end of the external switch circuit is electrically connected to the first end of the external current detection component, and the control end of the external switch is electrically connected to the control end of the external processor, and the control end of the external processor outputs a detection control signal.

[0011] Optionally, the external current detection component includes: an external shunt and an external sampling circuit;

[0012] The first end of the external shunt is electrically connected to the detection current output end, the second end of the external shunt is electrically connected to the first end of the capacitive load, the current output end of the external shunt is electrically connected to the input end of the external sampling circuit, the output end of the external sampling circuit is the data output end of the external current detection component, and the data output end of the external current detection component outputs external detection current data.

[0013] Optionally, the external detection unit further includes: an external processor;

[0014] The data acquisition end of the external processor is electrically connected to the data output end of the external current detection component, the data output end of the external current detection component outputs external detection current data, and the data output end of the external processor outputs an external comparison signal, which is a signal generated by the external processor after comparing the external detection current data with the external alarm current threshold.

[0015] Optionally, the capacitive load includes a pre-charge capacitor, a first end of the pre-charge capacitor is electrically connected to the second end of the external current detection component, and a second end of the pre-charge capacitor is electrically connected to the detection current input end.

[0016] Optionally, the detection system further comprises: a discharge processor and a loop switch;

[0017] The second end of the capacitive load is electrically connected to the detection current input end through a loop switch, the first end of the loop switch is electrically connected to the second end of the capacitive load, the second end of the loop switch is electrically connected to the detection current input end, and the control end of the loop switch is electrically connected to the control end of the discharge processor;

[0018] The control end of the discharge processor outputs a discharge control signal.

[0019] Optionally, the detection system further includes: a discharge switch and a discharge resistor;

[0020] The discharge switch and the discharge resistor are connected in series between the first end of the capacitive load and the second end of the capacitive load, and the discharge switch and the discharge resistor are connected in series, and the control end of the discharge switch is electrically connected to the control end of the discharge processor.

[0021] Optionally, at least one of the loop switch and the discharge switch is a relay.

[0022] Optionally, the detection system further includes: a host computer;

[0023] The host computer is electrically connected to at least one of the external detection unit and the discharge processor.

[0024] Based on the same inventive concept, the present invention also provides a detection device, which includes the above-mentioned detection system.

[0025] Compared with the existing technology, the technical solution provided by the utility model has at least the following advantages:

[0026] The present invention provides a detection system and detection equipment, wherein the detection system includes an external detection unit and a capacitive load; the external detection unit includes an external current detection component; the first end of the external current detection component is electrically connected to the current output end, the second end of the external current detection component is electrically connected to the first end of the capacitive load, and the second end of the capacitive load is electrically connected to the current input end. The technical solution provided by the present invention can be used to detect battery packs, and the battery pack application environment is simulated by a capacitive load. When the battery pack is connected to the capacitive load, the transient current under the short-circuit function is detected by the external current detection component, thereby realizing the detection of the battery pack based on the detected current. The transient current detection process is simple, the detection efficiency is improved, and it is more suitable for the detection of mass-produced battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of the structure of a detection system provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of another detection system provided in an embodiment of the present application;

[0030] Figure 3A schematic diagram of the structure of another detection system provided in an embodiment of the present application;

[0031] Figure 4 A schematic structural diagram of another detection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] As described in the background technology, the detection of the battery PACK includes the detection of the pre-charge function and / or the short-circuit function, but the existing detection is usually implemented using an oscilloscope and a current gun. The operation process is cumbersome and complicated, and requires the operator to have certain operating skills, which reduces the detection efficiency.

[0034] In view of this, the embodiments of the present application provide a detection system and detection equipment, which effectively solve the technical problems existing in the prior art, improve the detection efficiency, and are more suitable for the detection of mass-produced battery PACKs.

[0035] To achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows, specifically combined with Figures 1 to 4 The technical solutions provided in the embodiments of the present application are described in detail.

[0036] refer to Figure 1The figure shows a schematic diagram of the structure of a detection system provided in an embodiment of the present application, wherein the detection system is a transient current detection system. The detection system provided in an embodiment of the present application can be used to detect a battery PACK100, and the detection system includes an external detection unit 300 and a capacitive load 400; the external detection unit 300 includes an external current detection component 310; a first end of the external current detection component 310 is electrically connected to a detection current output end, wherein the detection current output end may be a current output end of the battery PACK100; a second end of the external current detection component 310 is electrically connected to a first end of the capacitive load 400, and a second end of the capacitive load 400 is electrically connected to a detection current input end, wherein the detection current input end may be a current input end of the battery PACK100. The application environment of the battery PACK 100 is simulated by a capacitive load 400. When the battery PACK 100 is connected to the capacitive load 400, the transient current detection under the short-circuit function is realized through the external current detection component 310. Thus, the battery PACK 100 is detected based on the detected current. The transient current detection process is simple, the detection efficiency is improved, and it is more suitable for the detection of mass-produced battery PACK 100.

[0037] Specifically, the battery PACK100 provided in the embodiment of the present application may include an internal unit to be tested 200 and a battery module 110. It should be noted that the current output terminal of the internal unit to be tested 200, the current output terminal of the battery PACK100, and the detection current output terminal described below have the same structure; and the current input terminal of the internal unit to be tested 200, the current input terminal of the battery PACK100, and the detection current input terminal have the same structure. The internal unit to be tested 200 includes at least one of a direct charging branch 210 and a pre-charging branch 220, the internal unit to be tested 200 also includes an internal current detection component 230 and an internal processor 240, and the external detection unit 300 includes an external current detection component 310. The first end of the direct charging branch 210 and the first end of the pre-charging branch 220 are both electrically connected to the positive pole of the battery module 110, the second end of the direct charging branch 210, the second end of the pre-charging branch 220 and the first end of the external current detection component 310 are all electrically connected to the current output end of the internal unit to be tested 200, the second end of the external current detection component 310 is electrically connected to the first end of the capacitive load 400, the second end of the capacitive load 400 and the first end of the internal current detection component 230 are both electrically connected to the current input end of the internal unit to be tested 200, and the second end of the internal current detection component is electrically connected to the negative pole of the battery module 110.

[0038] The control end of the internal processor 240 is electrically connected to the direct-charging branch 210 and the pre-charging branch 220, wherein the control end of the internal processor 240 outputs a selection control signal, and the selection control signal is a signal for controlling the direct-charging branch 210 to connect to the positive electrode of the battery module 110 and the current output end of the internal unit to be tested 200 to form a short-circuit current path, or controlling the pre-charging branch 220 to connect to the positive electrode of the battery module 110 and the current output end of the internal unit to be tested 200 to form a pre-charging current path.

[0039] It can be understood that the battery PACK is the structure to be tested for the transient current to be tested, and the internal unit to be tested of the battery PACK can be a unit to be tested that includes only a direct charging branch, or a unit to be tested that includes only a pre-charging branch, or a unit to be tested that includes both a direct charging branch and a pre-charging branch. This needs to be designed according to the application scenario of the battery PACK. Generally, the internal unit to be tested of the battery PACK is a unit to be tested that includes only a direct charging branch or a unit to be tested that includes both a direct charging branch and a pre-charging branch. This application does not impose specific restrictions on this. Optionally, the battery PACK provided in the embodiment of the present application can be a power battery. The capacitive load is used to simulate the application environment of the battery PACK. The capacitance of the capacitive load is different in different application environments. For example, when the application environment is a vehicle, the capacitance of the capacitive load can be configured according to the specific environment of the vehicle. The external detection unit is a standard structure for transient current detection in the current loop, which is used to determine whether the transient current of the battery pack to be tested meets the expected theoretical value, thereby achieving the purpose of detecting the short-circuit function and / or pre-charge function of the battery pack, that is, to detect the direct charging branch and / or pre-charge branch in the battery pack.

[0040] The technical solution provided in the embodiment of the present application is equivalent to a simulated short-circuit function when the internal processor controls the direct-charging branch to connect the battery module and the capacitive load, and realizes the detection of the transient current under the short-circuit function through the internal current detection component and the external current detection component, thereby realizing the detection of the battery PACK based on the detected current; and when the internal processor controls the pre-charging branch to connect the battery module and the capacitive load, it is equivalent to a simulated pre-charging function, and realizes the detection of the transient current under the pre-charging function through the internal current detection component and the external current detection component, thereby realizing the detection of the battery PACK based on the detected current. The technical solution provided in the embodiment of the present application simplifies the transient current detection process, improves the detection efficiency, and is more suitable for the detection of mass-produced battery PACKs.

[0041] Specifically, the detection system provided in the embodiment of the present application can detect the short-circuit function and / or the pre-charge function by detecting the transient current, and finally achieve the purpose of detecting the battery PACK. The battery PACK may include only a direct-charging branch, or the battery PACK may include only a pre-charging branch, or the battery PACK may include both a direct-charging branch and a pre-charging branch; in this regard, in a detection process of the battery PACK, only the short-circuit function of the battery PACK may be detected, or only the pre-charging function of the battery PACK may be detected, or the short-circuit function and the pre-charging function of the battery PACK may be detected in combination (such as the short-circuit function of the battery PACK may be detected first, and then the pre-charging function of the battery PACK may be detected; or the pre-charging function of the battery PACK may be detected first, and then the short-circuit function of the battery PACK may be detected). The short-circuit function detection process of the battery PACK provided in the embodiment of the present application can be:

[0042] The internal processor controls the direct charging branch to connect the positive pole of the battery module and the current output end of the internal unit to be tested, so that the battery module and the capacitive load form a short-circuit loop. At the same time, the internal current detection component detects the internal short-circuit current in the short-circuit loop, and the external current detection component detects the external short-circuit current in the short-circuit loop. The internal short-circuit current and the external short-circuit current are then judged to determine whether the battery PACK has an abnormality, wherein, when the external short-circuit current is greater than the external short-circuit alarm current threshold, and the internal short-circuit current is greater than the internal short-circuit alarm current threshold, that is, when both the internal unit to be tested and the external detection unit feedback a short-circuit alarm, it is determined that the short-circuit current of the battery PACK meets the expected theoretical value, and the battery PACK is determined to be qualified, wherein the external short-circuit alarm current threshold is less than the internal short-circuit alarm current threshold; or, when the external short-circuit current is less than the external short-circuit alarm current threshold, and the internal short-circuit current is greater than the internal short-circuit alarm current threshold, that is, when the internal unit to be tested feedbacks a short-circuit warning and the external detection unit does not feedback a short-circuit alarm, it is determined. When the short-circuit current of the battery PACK is lower than the expected theoretical value, the battery PACK is determined to be abnormal; or, when the external short-circuit current is greater than the external short-circuit alarm current threshold, and the internal short-circuit current is less than the internal short-circuit alarm current threshold, that is, the external detection unit feeds back a short-circuit alarm but the internal unit to be tested does not feed back a short-circuit alarm, then it is determined that the battery PACK has failed to detect the short-circuit circuit, and the battery PACK is determined to be abnormal; or, when the external short-circuit current is less than the external short-circuit alarm current threshold, and the internal short-circuit current is less than the internal short-circuit alarm current threshold, that is, neither the internal unit to be tested nor the external detection unit feeds back a short-circuit alarm, then it is determined that the short-circuit current of the battery PCAK is lower than the expected theoretical value, and the battery PACK is determined to be abnormal.

[0043] Furthermore, the pre-charge function detection process of the battery pack provided in the embodiment of the present application may be:

[0044] The internal processor controls the pre-charge branch to connect the positive pole of the battery module and the current output end of the internal unit to be tested, so that the battery module and the capacitive load form a pre-charge circuit. At the same time, the internal current detection component detects the internal pre-charge current in the pre-charge circuit, and the external current detection component detects the external pre-charge current in the pre-charge circuit. The internal pre-charge current and the external pre-charge current are then judged to determine whether the battery PACK has an abnormality, wherein, when the external pre-charge current is greater than the external pre-charge alarm current threshold, and the internal pre-charge current is greater than the internal pre-charge alarm current threshold, that is, when both the internal unit to be tested and the external detection unit feedback the pre-charge alarm, it is determined that the pre-charge current of the battery PACK exceeds the expected theoretical value, and the battery PACK is determined to be abnormal, wherein the external pre-charge alarm current threshold is less than the internal pre-charge alarm current threshold; or, when the external pre-charge current is less than the external pre-charge alarm current threshold, and the internal pre-charge current is greater than the internal pre-charge alarm current threshold, that is, when the internal unit to be tested feedbacks the pre-charge warning and the external detection unit does not feedback the pre-charge alarm, then the pre-charge of the battery PACK is determined to be abnormal. The current meets the expected theoretical value, but the current detection of the battery PACK is abnormal; or, when the external pre-charge current is greater than the external pre-charge alarm current threshold, and the internal pre-charge current is less than the internal pre-charge alarm current threshold, that is, the external detection unit feeds back the pre-charge alarm and the internal unit to be tested does not feed back the pre-charge alarm, then it is determined that the pre-charge current of the battery PACK exceeds the expected theoretical value, but does not reach the short-circuit protection threshold, and the battery PACK is abnormal; or, when the external pre-charge current is less than the external pre-charge alarm current threshold, and the internal pre-charge current is less than the internal pre-charge alarm current threshold, that is, neither the internal unit to be tested nor the external detection unit feeds back the pre-charge alarm, then it is determined that the pre-charge current of the battery PCAK meets the expected theoretical value, and the battery PACK is determined to be qualified.

[0045] Furthermore, before performing short-circuit and pre-charge function tests on the battery pack, a function test can be performed on the detection system to determine whether it is normal, thereby achieving the purpose of troubleshooting abnormalities in the detection system. Specifically, the function test of the detection system includes:

[0046] The internal processor controls the direct charging branch to connect the positive pole of the battery module and the current output end of the internal unit to be tested, so that the battery module and the capacitive load form a short-circuit loop. At the same time, the internal current detection component detects the internal short-circuit current in the short-circuit loop, and the external current detection component detects the external short-circuit current in the short-circuit loop. The internal short-circuit current and the external short-circuit current are then judged to determine whether the detection system is functioning normally. When the external short-circuit current is greater than the external pre-charge theoretical current, the detection system is determined to be functioning normally. The external pre-charge theoretical current is the theoretical current value when the battery PACK pre-charges the capacitive load normally through the pre-charge branch; or, when the external short-circuit current is less than the external pre-charge theoretical current, the detection system is determined to be functioning abnormally or the battery PACK is abnormal.

[0047] In one embodiment of the present application, the comparison of the internal short-circuit current and the internal short-circuit alarm current threshold, and the comparison of the internal pre-charge current and the internal pre-charge alarm current threshold provided by the embodiment of the present application can be completed by an internal processor. Similarly, the comparison of the external short-circuit current and the external short-circuit alarm current threshold, and the comparison of the external pre-charge current and the external pre-charge alarm current threshold can be completed by an external processor of the external detection unit. For specific reference Figure 2 , which is a schematic diagram of the structure of another detection system provided by an embodiment of the present application, wherein the data acquisition terminal of the internal processor 240 provided by the embodiment of the present application is electrically connected to the data output terminal of the internal current detection component 230, the data output terminal of the internal current detection component 230 outputs internal detection current data, and the data output terminal of the internal processor 240 outputs an internal comparison signal, the internal comparison signal being a signal generated by the internal processor 240 after comparing the internal detection current data with the internal alarm current threshold. And / or, the external detection unit 300 provided by the embodiment of the present application further includes: an external processor 320; the data acquisition terminal of the external processor 320 is electrically connected to the data output terminal of the external current detection component 310, the data output terminal of the external current detection component 310 outputs external detection current data, and the data output terminal of the external processor 320 outputs an external comparison signal, the external comparison signal being a signal generated by the external processor after comparing the external detection current data with the external alarm current threshold.

[0048] It should be noted that the internal detection current data provided in the embodiments of the present application include internal short-circuit current and / or internal pre-charge current, and the external detection current data include external short-circuit current and / or external pre-charge current; and the internal alarm current threshold includes internal short-circuit alarm current threshold and / or internal pre-charge alarm current threshold, and the external alarm current threshold includes external short-circuit alarm current threshold and / or external pre-charge alarm current threshold. The internal short-circuit current, external circuit current, internal short-circuit alarm current threshold and external short-circuit alarm current threshold are used in the comparison process when performing short-circuit function detection on the battery PACK, and the internal pre-charge current, external pre-charge current, internal pre-charge alarm current threshold and external pre-charge alarm current threshold are used in the comparison process when performing pre-charge function detection on the battery PACK.

[0049] refer to Figure 3 , which is a structural diagram of another detection system provided by an embodiment of the present application, wherein the direct-charging branch 210 provided by the embodiment of the present application includes a direct-charging switch Mz connected in series between the positive electrode of the battery module 110 and the current output end of the internal unit under test 200, and the control end of the direct-charging switch Mz is electrically connected to the control end of the internal processor 240. And / or, the pre-charging branch 220 includes a pre-charging switch My and a pre-charging resistor Ry connected in series between the positive electrode of the battery module 110 and the current output end of the internal unit under test 200, and the pre-charging switch Mz and the pre-charging resistor Ry are connected in series, and the control end of the pre-charging switch My is electrically connected to the control end of the internal processor 240.

[0050] Continue as Figure 3As shown, the internal unit to be tested 200 provided in the embodiment of the present application further includes: an internal switch Mn, the second end of the direct-charging branch 210 and the second end of the pre-charging branch 220 are both electrically connected to the current output end of the internal unit to be tested 200 through the internal switch Mn; the first end of the internal switch Mn is electrically connected to the second end of the direct-charging branch 210 and the second end of the pre-charging branch 220, the second end of the internal switch Mn is electrically connected to the current output end of the internal unit to be tested 200, and the control end of the internal switch Mn is electrically connected to the control end of the internal processor 240, thereby improving the safety of the battery PACK through the multi-switch setting. The types of the direct-charging switch Mz, pre-charging switch My and internal switch Mn provided in the embodiment of the present application are not specifically limited, and they can be metal oxide semiconductor field effect transistors, etc., which need to be specifically designed according to actual applications. When the internal processor 240 controls the direct charging branch 210, the internal processor 240 controls the direct charging switch Mz and the internal switch Mn to be turned on, and controls the pre-charging switch My to be turned off; or when the internal processor 240 controls the pre-charging branch 220, the internal processor 240 controls the pre-charging switch My and the internal switch Mn to be turned on, and controls the direct charging switch Mz to be turned off.

[0051] In one embodiment of the present application, the external detection unit may also be provided with a switch to control the on / off of the external detection unit, thereby further improving the safety of the detection system. Figure 3As shown, the external detection unit 300 provided in the embodiment of the present application further includes: an external processor 320; and the external detection unit 300 further includes: an external switch circuit 330, the external switch circuit 330 including at least one external switch Mw; when the external switch circuit 330 includes multiple external switches Mw, the multiple external switches Mw are connected in series; the first end of the external current detection component 310 is electrically connected to the current output end of the internal unit under test 200 through the external switch circuit 330. The first end of the external switch circuit 330 is electrically connected to the current output end of the internal unit under test 200, the second end of the external switch circuit 330 is electrically connected to the first end of the external current detection component 310, and the control end of the external switch Mw is electrically connected to the control end of the external processor 320. The control end of the external processor 320 outputs a detection control signal, which is a signal that controls the external switch circuit 330 to connect the current output end of the internal unit under test 200 and the first end of the external current detection component 310 when the gating control signal is valid. The type of external switch Mw provided in the present embodiment is not specifically limited and may be a metal oxide semiconductor field effect transistor, etc., and needs to be specifically designed according to the actual application. When the internal processor 240 controls the direct charging branch 210 to be active or the pre-charging branch 220 to be active, the external processor 320 controls the external switch Mw to be conductive, thereby forming a current path with the capacitive load 400.

[0052] In one embodiment of the present application, the current detection component provided in the embodiment of the present application can realize the current detection of the connection loop through a shunt. Figure 3As shown, the internal current detection component 230 provided in the embodiment of the present application includes: an internal shunt 231 and an internal sampling circuit 232. The first end of the internal shunt 231 is electrically connected to the current input end of the internal unit under test 200, the second end of the internal shunt 231 is electrically connected to the negative electrode of the battery module 110, the current output end of the internal shunt 231 is electrically connected to the input end of the internal sampling circuit 232, and the output end of the internal sampling circuit 232 is the data output end of the internal current detection component 230, and the data output end of the internal current detection component 230 outputs internal detection current data. The internal shunt 231 transmits the detection current to the internal sampling circuit 232, and the internal sampling circuit 232 converts the current into a voltage output. Specifically, the voltage can be transmitted to the internal processor 240. The internal processor 240 compares the voltage containing the current information with the corresponding alarm threshold to ultimately obtain a comparison result between the internal detection current data and the internal alarm current threshold. And / or, the external current detection component 310 provided in the embodiment of the present application includes: an external shunt 311 and an external sampling circuit 312. The first end of the external shunt 311 is electrically connected to the current output end of the internal unit under test 200, the second end of the external shunt 311 is electrically connected to the first end of the capacitive load 400, the current output end of the external shunt 311 is electrically connected to the input end of the external sampling circuit 312, the output end of the external sampling circuit 312 is the data output end of the external current detection component 310, and the data output end of the external current detection component 310 outputs external detection current data. The external shunt 311 transmits the detection current to the external sampling circuit 312, and the external sampling circuit 312 converts the current into a voltage output. Specifically, the voltage can be transmitted to the external processor 320. The external processor 320 compares the voltage with the corresponding alarm threshold to ultimately obtain a comparison result between the external detection current data and the external alarm current threshold.

[0053] In one embodiment of the present application, at least one of the internal sampling circuit and the external sampling circuit provided in this embodiment of the present application can be a rectification / feedback unit (Active Front End, AFE). The AFE uses Ohm's law to convert the current collected by the shunt into a voltage for sampling and then feeds it back to the processor to execute the relevant current and alarm threshold determination strategy.

[0054] Continue to refer Figure 3As shown, the capacitive load 400 provided in the embodiment of the present application includes a pre-charge capacitor Cy, a first end of which is electrically connected to the second end of the external current detection component 310, and a second end of which is electrically connected to the current input terminal of the internal unit under test 200. The pre-charge capacitor Cy is used to simulate the application environment of the battery PACK. The capacitance of the pre-charge capacitor Cy varies in different application environments. For example, when the application environment is a vehicle, the capacitance of the pre-charge capacitor Cy can be configured according to the specific environment of the vehicle.

[0055] Furthermore, when testing the battery pack, after the capacitive load is charged once, in order to improve the detection efficiency, the capacitive load can be discharged through the discharge structure, thereby facilitating the next charging of the capacitive load and the detection of the battery pack, thereby improving the detection efficiency. Figure 4 , which is a structural diagram of another detection system provided in an embodiment of the present application, wherein the detection system provided in an embodiment of the present application further includes: a discharge processor 510, a loop switch 521, a discharge switch 522 and a discharge resistor 530; the second end of the capacitive load 400 is electrically connected to the current input end of the internal unit under test 200 through the loop switch 521, the first end of the loop switch 521 is electrically connected to the second end of the capacitive load 400, the second end of the loop switch 521 is electrically connected to the current input end of the internal unit under test 200, and the control end of the loop switch 521 is electrically connected to the control end of the discharge processor 510. The discharge switch 522 and the discharge resistor 530 are connected in series between the first terminal and the second terminal of the capacitive load 400. The discharge switch 522 and the discharge resistor 530 are connected in series, and the control terminal of the discharge switch 522 is electrically connected to the control terminal of the discharge processor 510. The control terminal of the discharge processor 510 outputs a discharge control signal. The discharge control signal is a signal that controls the loop switch 521 to be disconnected and the discharge switch 522 to be connected when the strobe control signal is invalid, and controls the loop switch 521 to be connected and the discharge switch 522 to be disconnected when the strobe control signal is valid (controlling the direct charge branch or the pre-charge branch). The discharge resistor 530 is used to discharge the energy last charged into the capacitive load 400. The resistance value of the discharge resistor 530 can be configured according to the amount of energy that can be charged into the capacitive load 400.

[0056] In any of the above-mentioned embodiments of the present application, at least one of the loop switch and the discharge switch provided in the embodiments of the present application may be a relay, which is not specifically limited in the present application. Furthermore, the discharge processor provided in the embodiments of the present application may be a programmable logic controller (PLC). Furthermore, at least one of the internal processor and the external processor provided in the embodiments of the present application may be a microcontroller unit (MCU); optionally, both the internal processor and the external processor may be MCUs.

[0057] Continue to refer Figure 4 As shown, the detection system provided in the embodiment of the present application may further include a host computer 600, and the host computer 600 is electrically connected to at least one of the internal unit to be tested 200, the external detection unit 300 and the discharge processor. Specifically, the host computer 600 can be connected to the internal unit to be tested 200 and the external detection unit 300 through a CAN line, and the host computer 600 realizes data interaction with the internal processor 240 and the external processor 320. For example, the host computer 600 can communicate with the internal processor 240, so that the internal processor 240 outputs a selection control signal to control the action of the direct charging branch 210 or the action of the pre-charging branch 220; the host computer 600 can communicate with the external processor 320, so that the external processor 320 controls the on and off of the external switch Mw, and changes the external short-circuit current alarm threshold and the external pre-charging alarm current threshold stored in the external processor 320; and the host computer 600 can also obtain the internal comparison signal output by the internal processor 240 and the external comparison signal output by the external processor 320, so as to analyze and judge the detection status of the battery PACK according to the comparison results. In addition, the host computer 600 can also be connected to the discharge processor 510 through a LAN line. The host computer 600 can communicate with the discharge processor 510 so that the discharge processor 510 controls the on and off of the loop switch 521 and the discharge switch 522 .

[0058] Specific combination Figure 4 The transient current detection system shown in the embodiment of the present application can detect the short-circuit function and pre-charge function of the battery pack. Before the short-circuit function and pre-charge function of the battery pack are detected, the transient current detection system can be tested to see if it is functioning normally, including:

[0059] The host computer 600 clears the alarm status fed back in the internal processor 240 and the external processor 320 by interacting with the data of the internal processor 240 and the external processor 320, and modifies the threshold value in the external processor 320 to the external charging theoretical current. The external pre-charge theoretical current is the theoretical current value when the battery PACK normally pre-charges the capacitive load 400 through the pre-charge branch 220. The internal processor 240, the external processor 320, and the discharge processor 510 are used to control the direct charging switch Mz to be turned on, the internal switch Mn to be turned on, the external switch Mw to be turned on, and the loop switch 521 to be turned on, and the remaining switches to be turned off. The external current detection component 310 then detects the external short-circuit current in the short-circuit loop and transmits it to the external processor 320 for comparison with the external pre-charge theoretical current. The comparison result is sent to the host computer 600. The host computer 600 judges the comparison result. When the external short-circuit current is greater than the external pre-charge theoretical current, it determines that the detection system functions normally; or when the external short-circuit current is less than the external pre-charge theoretical current, it determines that the detection system functions abnormally or the battery PACK is abnormal.

[0060] After checking whether the transient current detection system functions normally, the host computer 600 controls the discharge switch 522 to be turned on through the discharge processor 510, and controls the other switches to be turned off, thereby discharging the energy of the capacitive load 400 through the discharge resistor 530, and then detects the short-circuit function and / or pre-charge function of the battery PACK.

[0061] For example, the short circuit function of the battery pack can be tested first, including:

[0062] The host computer 600 clears the alarm status fed back by the internal processor 240 and the external processor 320 through data interaction with the internal processor 240 and the external processor 320, and modifies the threshold in the external processor 320 to the external short-circuit alarm current threshold. The host computer 600 then controls the direct charging switch Mz to be turned on, the internal switch Mn to be turned on, the external switch Mw to be turned on, and the loop switch 521 to be turned on, through the internal processor 240, the external processor 320, and the discharge processor 510, and controls the remaining switches to be turned off. The internal current detection component 230 detects the internal short-circuit current in the short-circuit loop and transmits it to the internal processor 240, while the external current detection component 310 detects the external short-circuit current in the short-circuit loop and transmits it to the external processor 320. The internal processor 240 compares the internal short-circuit current with the internal short-circuit alarm current threshold and transmits the comparison result to the host computer 600, and the external processor 320 compares the external short-circuit current with the external short-circuit alarm current threshold and transmits the comparison result to the host computer 600; that is, the internal processor 240 uploads the short-circuit alarm result to the host computer 600 after current comparison, and at the same time, the external processor 320 uploads the short-circuit alarm result to the host computer 600 after current comparison. The host computer 600 analyzes the comparison results, wherein, when the external short-circuit current is greater than the external short-circuit alarm current threshold, and the internal short-circuit current is greater than the internal short-circuit alarm current threshold, that is, when both the internal processor 240 and the external processor 320 feedback a short-circuit alarm, it is determined that the short-circuit current of the battery PACK meets the expected theoretical value, and the battery PACK is determined to be qualified, wherein the internal short-circuit alarm current threshold is a current threshold inherently set by the battery PACK itself, and the external short-circuit alarm threshold is a current threshold set based on test experience, etc., and the optional external short-circuit alarm current threshold is equal to the internal short-circuit alarm current threshold; or, when the external short-circuit current is less than the external short-circuit alarm current threshold, and the internal short-circuit current is greater than the internal short-circuit alarm current threshold, that is, the internal processor 240 feedbacks a short-circuit warning and the external When the processor 320 does not feedback a short-circuit alarm, it is determined that the short-circuit current of the battery PACK is lower than the expected theoretical value, and the battery PACK is determined to be abnormal; or, when the external short-circuit current is greater than the external short-circuit alarm current threshold, and the internal short-circuit current is less than the internal short-circuit alarm current threshold, that is, the external processor 320 feedbacks a short-circuit alarm and the internal processor 240 does not feedback a short-circuit alarm, it is determined that the battery PACK fails to detect the short circuit, and the battery PACK is determined to be abnormal; or, when the external short-circuit current is less than the external short-circuit alarm current threshold, and the internal short-circuit current is less than the internal short-circuit alarm current threshold, that is, neither the internal processor 240 nor the external processor 320 feedbacks a short-circuit alarm, it is determined that the short-circuit current of the battery PCAK is lower than the expected theoretical value, and the battery PACK is determined to be abnormal.

[0063] After testing the short-circuit function of the battery pack, the host computer 600 controls the discharge switch 522 to be turned on through the discharge processor 510, and controls the other switches to be turned off, thereby discharging the energy of the capacitive load 400 through the discharge resistor 530. Then, the pre-charge function of the battery pack is tested, including:

[0064] The host computer 600 clears the alarm status fed back from the internal processor 240 and the external processor 320 through data interaction with the internal processor 240 and the external processor 320, and modifies the threshold in the external processor 320 to the external pre-charge alarm current threshold. The host computer 600 then controls the pre-charge switch My to be turned on, the internal switch Mn to be turned on, the external switch Mw to be turned on, and the loop switch 521 to be turned on, through the internal processor 240, the external processor 320, and the discharge processor 510, and controls the remaining switches to be turned off. The internal current detection component 230 detects the internal pre-charge current in the pre-charge loop and transmits it to the internal processor 240, while the external current detection component 310 detects the external pre-charge current in the pre-charge loop and transmits it to the external processor 320. The internal processor 240 compares the internal pre-charge current with the internal pre-charge alarm current threshold and transmits the comparison result to the host computer 600, and the external processor 320 compares the external pre-charge current with the external pre-charge alarm current threshold and transmits the comparison result to the host computer 600; that is, the internal processor 240 uploads the pre-charge alarm result to the host computer 600 after current comparison, and at the same time, the external processor 320 uploads the pre-charge alarm result to the host computer 600 after current comparison.The upper computer 600 analyzes the comparison results, wherein, when the external pre-charge current is greater than the external pre-charge alarm current threshold, and the internal pre-charge current is greater than the internal pre-charge alarm current threshold, that is, when both the internal processor 240 and the external processor 320 feedback the pre-charge alarm, it is determined that the pre-charge current of the battery PACK exceeds the expected theoretical value, and the battery PACK is determined to be abnormal, wherein the internal pre-charge alarm current threshold is the current threshold inherently set by the battery PACK itself, and the external pre-charge alarm threshold is the current threshold set according to test experience, etc., and the optional external pre-charge alarm current threshold is less than the internal pre-charge alarm current threshold; and, the external pre-charge alarm is essentially equivalent to an external short-circuit alarm, which is an alarm state when the external pre-charge current exceeds the external pre-charge alarm current threshold; or, when the external pre-charge current is less than the external pre-charge alarm current threshold, and the internal pre-charge current is greater than the internal pre-charge alarm current threshold, that is, When the internal processor 240 feeds back a pre-charge warning and the external processor 320 does not feed back a pre-charge alarm, it is determined that the pre-charge current of the battery PACK meets the expected theoretical value, but the current detection of the battery PACK is abnormal; or, when the external pre-charge current is greater than the external pre-charge alarm current threshold, and the internal pre-charge current is less than the internal pre-charge alarm current threshold, that is, the external processor 320 feeds back a pre-charge alarm and the internal processor 240 does not feed back a pre-charge alarm, it is determined that the pre-charge current of the battery PACK exceeds the expected theoretical value, but does not reach the short-circuit protection threshold, and the battery PACK is abnormal; or, when the external pre-charge current is less than the external pre-charge alarm current threshold, and the internal pre-charge current is less than the internal pre-charge alarm current threshold, that is, neither the internal processor 240 nor the external processor 320 feeds back a pre-charge alarm, it is determined that the pre-charge current of the battery PCAK meets the expected theoretical value, and the battery PACK is determined to be qualified.

[0065] Based on the same inventive concept, an embodiment of the present application further provides a detection device, which includes the detection system provided by any one of the above embodiments.

[0066] The embodiment of the present application provides a detection system and a detection device that can be used to detect a battery PACK, wherein the battery PACK includes an internal unit to be tested and a battery module, and the detection system includes an external detection unit and a capacitive load; the internal unit to be tested includes at least one of a direct-charge branch and a pre-charge branch, and the internal detection unit includes an internal current detection component and an internal processor, and the external detection unit includes an external current detection component. The technical solution provided by the embodiment of the present application simulates the application environment of the battery PACK through a capacitive load, and when the internal processor controls the direct-charge branch to connect the battery module and the capacitive load, it is equivalent to simulating a short-circuit function, and the internal current detection component and the external current detection component are used to detect the transient current under the short-circuit function, thereby realizing the detection of the battery PACK according to the detected current; and when the internal processor controls the pre-charge branch to connect the battery module and the capacitive load, it is equivalent to simulating a pre-charge function, and the internal current detection component and the external current detection component are used to detect the transient current under the pre-charge function, thereby realizing the detection of the battery PACK according to the detected current. The technical solution provided in the embodiment of the present application simplifies the transient current detection process, improves the detection efficiency, and is more suitable for the detection of mass-produced battery PACKs.

[0067] In the description of this application, it should be understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 a limitation on this application.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0069] In this application, unless otherwise specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; internal communication between two elements, or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0071] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A detection system, characterized in that: The detection system includes an external detection unit and a capacitive load; the external detection unit includes an external current detection component; The first end of the external current detection component is electrically connected to the detection current output end, the second end of the external current detection component is electrically connected to the first end of the capacitive load, and the second end of the capacitive load is electrically connected to the detection current input end.

2. The detection system according to claim 1, characterized in that The external detection unit further includes: an external processor; Furthermore, the external detection unit further includes: an external switch circuit, the external switch circuit including at least one external switch; when the external switch circuit includes a plurality of external switches, the plurality of external switches are connected in series; the first end of the external current detection component is electrically connected to the detection current output end through the external switch circuit; The first end of the external switch circuit is electrically connected to the detection current output end, the second end of the external switch circuit is electrically connected to the first end of the external current detection component, and the control end of the external switch is electrically connected to the control end of the external processor, and the control end of the external processor outputs a detection control signal.

3. The detection system according to claim 1, characterized in that The external current detection component includes: an external shunt and an external sampling circuit; The first end of the external shunt is electrically connected to the detection current output end, the second end of the external shunt is electrically connected to the first end of the capacitive load, the current output end of the external shunt is electrically connected to the input end of the external sampling circuit, the output end of the external sampling circuit is the data output end of the external current detection component, and the data output end of the external current detection component outputs external detection current data.

4. The detection system according to claim 1, characterized in that The external detection unit further includes: an external processor; The data acquisition end of the external processor is electrically connected to the data output end of the external current detection component, the data output end of the external current detection component outputs external detection current data, and the data output end of the external processor outputs an external comparison signal, which is a signal generated by the external processor after comparing the external detection current data with the external alarm current threshold.

5. The detection system according to claim 1, characterized in that The capacitive load includes a pre-charge capacitor, a first end of the pre-charge capacitor is electrically connected to the second end of the external current detection component, and a second end of the pre-charge capacitor is electrically connected to the detection current input end.

6. The detection system according to claim 1, characterized in that The detection system also includes: a discharge processor and a loop switch; The second end of the capacitive load is electrically connected to the detection current input end through a loop switch, the first end of the loop switch is electrically connected to the second end of the capacitive load, the second end of the loop switch is electrically connected to the detection current input end, and the control end of the loop switch is electrically connected to the control end of the discharge processor; The control end of the discharge processor outputs a discharge control signal.

7. The detection system according to claim 6, characterized in that The detection system further includes: a discharge switch and a discharge resistor; The discharge switch and the discharge resistor are connected in series between the first end of the capacitive load and the second end of the capacitive load, and the discharge switch and the discharge resistor are connected in series, and the control end of the discharge switch is electrically connected to the control end of the discharge processor.

8. The detection system according to claim 7, characterized in that: At least one of the loop switch and the discharge switch is a relay.

9. The detection system according to claim 6, characterized in that: The detection system further comprises: a host computer; The host computer is electrically connected to at least one of the external detection unit and the discharge processor.

10. A detection device, characterized in that: The detection device comprises the detection system according to any one of claims 1 to 9.

Images