Charging and discharging testing device

Abstract

The utility model provides a charging and discharging test device, and the device comprises a charging and discharging device which is electrically connected with a charging port and a discharging port. The switch part comprises at least two switches, and the at least two switches are connected with the charging port and the discharging port respectively, so that the charging loop and the discharging loop are connected in parallel; the controller is used for controlling the switch piece to be in a first working state in a charging mode, and the first working state means that the switch connected with the discharging port in the switch piece is switched off, and the switch connected with the charging port is switched on; the controller is further used for controlling the switch piece to be in a second working state in the discharging mode, and the second working state means that the switch connected with the charging port in the switch piece is switched off, and the switch connected with the discharging port is switched on. According to the testing device, connection of the charging loop or connection of the discharging loop can be automatically switched, two testing channels do not need to be arranged, the number of the channels is reduced, automatic switching is achieved through the controller, manpower is liberated, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of new energy, and particularly relates to a charge and discharge test device. Background Art

[0002] In the related art, the charging circuit and the discharging circuit of a power battery may be independent, that is, the charging and discharging are through different ports (different interfaces). The charging circuit and the discharging circuit are respectively used for the charging scenario and the discharging scenario and cannot be completely interchanged. Charging with the discharging circuit or discharging with the charging circuit may cause damage to the product. In the test of a power battery, two independent charging channels and discharging channels are required, and the test cost is greatly increased compared with that of the same port, and manual switching of the charging and discharging processes is required, and the test program cannot be continuously executed. Summary of the Utility Model

[0003] In view of the above defects or deficiencies in the prior art, it is desired to provide a charge and discharge test device, which saves the number of test channels, is conducive to automatically switching the charging circuit and the discharging circuit without manual switching, and thus is conducive to improving production efficiency.

[0004] The utility model provides a charge and discharge test device, including:

[0005] A charge and discharge device, which is respectively used for being electrically connected to the charging port and the discharging port of an energy storage device;

[0006] A switching member, including at least two switches, and the at least two switches are respectively connected to the charging port and the discharging port to make the charging circuit and the discharging circuit in parallel; wherein, the charging circuit refers to the circuit between the charge and discharge device and the charging port, and the discharging circuit refers to the circuit between the charge and discharge device and the discharging port;

[0007] A controller, which is respectively connected to the control ends of the at least two switching members;

[0008] The controller is used for controlling the switching member to be in a first working state in the charging mode, and the first working state means that the switch connected to the discharging port in the switching member is disconnected and the switch connected to the charging port is connected;

[0009] The controller is further used for controlling the switching member to be in a second working state in the discharging mode, and the second working state means that the switch connected to the charging port in the switching member is disconnected and the switch connected to the discharging port is connected.

[0010] As an alternative solution, the switching device includes a first switch, a second switch, a third switch, and a fourth switch. The first ends of the first switch, the second switch, the third switch, and the fourth switch are respectively connected to the charging and discharging device. Two of the second ends of the first switch, the second switch, the third switch, and the fourth switch are respectively connected to the charging port, and the remaining two are respectively connected to the discharging port.

[0011] As an alternative solution, it further includes a communication unit, which is respectively connected to the charging and discharging device and the controller;

[0012] The charging and discharging device is configured to send a mode signal to the controller through the communication unit. The mode signal includes a charging mode signal, a discharging mode signal, or a static mode signal.

[0013] As an alternative solution, the controller is further configured to receive the mode signal and control the switching device to be in a first working state or a second working state according to the charging mode signal or the discharging mode signal.

[0014] As an alternative solution, before controlling the switching device to be in the first working state or the second working state, the controller is further configured to,

[0015] Control the switching device to be in a static state according to the static mode signal. The static state means that at least two switches are turned on simultaneously.

[0016] As an alternative solution, the sending time of the charging mode signal or the sending time of the discharging mode signal is after the sending time of the static mode signal.

[0017] As an alternative solution, the sending time of the charging mode signal or the sending time of the discharging mode signal is after the sending time of the static mode signal, including:

[0018] The charging and discharging device internally presets a holding duration of the static state;

[0019] After the charging and discharging device sends the static mode signal and before the holding duration ends, the charging and discharging device sends the charging mode signal or the discharging mode signal to the controller.

[0020] As an alternative solution, the controller is further configured to collect the current value of the loop between the energy storage device and the charging and discharging device and determine the current working state of the switching device according to the current value.

[0021] As an alternative solution, the current value includes a first current value, a second current value, and a third current value. The first current value is used to indicate that the current working state is determined to be the first working state, the second current value is used to indicate that the current working state is determined to be the static state, and the third current value is used to indicate that the current working state is determined to be the third working state.

[0022] As an alternative, the current value further includes an abnormal current value. After the controller acquires the abnormal current value, the controller is further configured to determine the current working state of the switching device according to the abnormal current value.

[0023] As an alternative, when the controller determines that the current working state of the switching device is a shutdown state according to the abnormal current value, it includes:

[0024] The controller is further configured to control the communication unit to send an abnormal signal to the charge and discharge device;

[0025] The charge and discharge device is further configured to receive the abnormal signal and send a shutdown signal to the controller according to the abnormal signal;

[0026] The controller is further configured to receive the shutdown signal and control the current working state of the switching device to be a shutdown state according to the shutdown signal. The shutdown state means that at least two switches are simultaneously disconnected.

[0027] As an alternative, each switch includes at least one relay and / or MOS transistor.

[0028] As an alternative, the controller and the switching device are integrally arranged in a tooling box.

[0029] As an alternative, the communication unit uses CAN signal communication.

[0030] In the charge and discharge test device of the present utility model, through the switching device and the controller, the control end of the switching device is connected to the controller. The controller controls the switch connected to the charging port in the switching device to be turned on and the switch connected to the discharging port to be turned off in the charging mode; the controller controls the switch connected to the discharging port in the switching device to be turned on and the switch connected to the charging port to be turned off in the discharging mode. Thus, it is possible to switch on the charging circuit or the discharging circuit, without setting two test channels, saving the number of channels, and through the automatic switching of the controller, it is beneficial to liberate the manpower and improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of the non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 It is a schematic block diagram of the structure of a charge and discharge test device according to an embodiment of the present application;

[0033] Figure 2 It is a schematic block diagram of the structure of another charge and discharge test device according to an embodiment of the present application;

[0034] Figure 3 It is a schematic diagram of the structure of a charge and discharge test device according to an embodiment of the present application;

[0035] In the figure,

[0036] 100. Charging and discharging test device;

[0037] 10. Energy storage device, 11. Charging port, 12. Discharging port;

[0038] 20. Switching device, KM1. First switch, KM2. Second switch, KM3. Third switch, KM4. Fourth switch, 30. Controller, 40. Charging and discharging device, 50. Communication unit. Detailed implementation manners

[0039] The following further elaborates on the present application in conjunction with embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model and do not limit the utility model.

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the embodiments.

[0041] An embodiment of the present application provides a charging and discharging test device 100, as Figures 1-3 shown, including:

[0042] A charging and discharging device 40, which is electrically connected to the charging port 11 and the discharging port 12 respectively;

[0043] A switching device 20, including at least two switches, and the at least two switches are respectively connected to the charging port 11 and the discharging port 12 to make the charging circuit and the discharging circuit in parallel; wherein, the charging circuit refers to the circuit between the charging and discharging device 40 and the charging port 11, and the discharging circuit refers to the circuit between the charging and discharging device 40 and the discharging port 12;

[0044] A controller 30, which is respectively connected to the control ends of the at least two switches;

[0045] The controller 30 is used to control the switching device 20 to be in the first working state in the charging mode, and the first working state means that the switch in the switching device 20 connected to the discharging port 12 is disconnected and the switch connected to the charging port 11 is connected;

[0046] The controller 30 is further used to control the switching device 20 to be in the second working state in the discharging mode, and the second working state means that the switch in the switching device 20 connected to the charging port 11 is disconnected and the switch connected to the discharging port 12 is connected.

[0047] It can be understood that the energy storage device 10 can be any kind of power battery (for example, but not limited to, lithium-ion batteries, etc.). The energy storage device 10 can be an independent power battery, and of course, it can also be a power battery pack composed of two or more power batteries.

[0048] The energy storage device 10 has two independent charging ports 11 and discharging ports 12. The charging port 11 is used to connect to a charging circuit for charging or charging test of the energy storage device 10; the discharging port 12 is used to connect to a discharging circuit for the energy storage device 10 to discharge a load device or for discharging test of the energy storage device 10. Among them, the independent charging port 11 and discharging port 12 are beneficial to ensure the independence of the charging circuit and the discharging circuit, and avoid the problem of damage caused by misuse.

[0049] The charging and discharging device 40 in the embodiment of the present application serves as a load device and a charging device for providing electric energy, and is mainly used to facilitate the charging test or discharging test of the energy storage device 10, which is beneficial to timely understand the working performance of the energy storage device 10 and ensure the product quality of the energy storage device 10. The charging and discharging device 40 is electrically connected to the charging port 11 and the discharging port 12 of the energy storage device 10. The charging and discharging device 40 can determine whether the energy storage device 10 can be normally discharged or charged by detecting the current value in the circuit, and of course, it can also be a resistance value or a voltage value, etc.

[0050] It can also be understood that in the embodiment of the present application, by setting the switch member 20, the circuit connecting the charging and discharging device 40 and the energy storage device 10 is automatically switched, so that in the charging mode, the discharging circuit between the charging and discharging device 40 and the discharging port 12 of the energy storage device 10 is automatically disconnected, and the charging circuit between the charging and discharging device 40 and the charging port 11 of the energy storage device 10 is connected; in the discharging mode, the charging circuit between the charging and discharging device 40 and the discharging port 12 of the energy storage device 10 is automatically disconnected, and the discharging circuit between the charging and discharging device 40 and the charging port 11 of the energy storage device 10 is connected.

[0051] Among them, the switch member 20 can be but is not limited to any one of a diode, a triode, or a relay, etc.; since the charging port 11 of the energy storage device 10 includes a positive electrode interface and a negative electrode interface, and the discharging port 12 also includes a positive electrode interface and a negative electrode interface, therefore, at least one switch is respectively provided on the circuits where the charging and discharging device 40 is connected to the positive electrode interface and the negative electrode interface of the charging port 11, and at least one switch is respectively provided on the circuits where the charging and discharging device is connected to the positive electrode interface and the negative electrode interface of the discharging port 12, which is beneficial to reliably control the connection of the charging circuit and the discharging circuit, avoid the problem of cross-connection of the charging circuit and the discharging circuit, and ensure the quality of the energy storage device 10.

[0052] In a preferred embodiment, the switch 20 includes a first switch KM1, a second switch KM2, a third switch KM3, and a fourth switch KM4. The first ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively connected to the charging and discharging device 40. Two of the second ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively connected to the charging port 11, and the remaining two are respectively connected to the discharging port 12. Among them, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively disposed on the circuits connecting the charging device to the positive electrode interface of the charging port 11 of the energy storage device 10, the negative electrode interface of the charging port 11, the positive electrode interface of the discharging port 12, and the negative electrode interface of the discharging port 12.

[0053] In the embodiments of the present application, the first ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively connected to the charging and discharging device 40. Two of the second ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively connected to the positive electrode interface and the negative electrode interface of the charging port 11, and the remaining two of the second ends are respectively connected to the positive electrode interface and the negative electrode interface of the discharging port 12.

[0054] Exemplarily, the second end of the first switch KM1 and the second end of the second switch KM2 are respectively connected to the positive electrode interface and the negative electrode interface of the charging port 11, and the second end of the third switch KM3 and the second end of the fourth switch KM4 are respectively connected to the positive electrode interface and the negative electrode interface of the discharging port 12.

[0055] Another example is that the second end of the first switch KM1 and the second end of the third switch KM3 are respectively connected to the positive electrode interface and the negative electrode interface of the charging port 11, and the second end of the second switch KM2 and the second end of the fourth switch KM4 are respectively connected to the positive electrode interface and the negative electrode interface of the discharging port 12.

[0056] It can also be understood that the controller 30 can be any kind of controller 30, such as, but not limited to, a PLC controller 30. The controller 30 is respectively connected to the control ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4, and is used to control the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 to be turned on or off, so as to realize the switching of the charging circuit and the discharging circuit.

[0057] The charge-discharge switching device according to the embodiments of the present application solves the problem in the prior art that the charging circuit and the discharging circuit cannot be automatically switched. The charge-discharge switching device according to the embodiments of the present application is provided with a switching member 20 and a controller 30. The control end of the switching member 20 is connected to the controller 30. The controller 30 controls the switch connected to the charging port 11 in the switching member 20 to be turned on and the switch connected to the discharging port 12 to be turned off in the charging mode; the controller 30 controls the switch connected to the discharging port 12 in the switching member 20 to be turned on and the switch connected to the charging port 11 to be turned off in the discharging mode, so that the charging circuit can be switched on or the discharging circuit can be switched on. There is no need to set two test channels, saving the number of channels, and the automatic switching by the controller 30 is conducive to liberating manpower and improving production efficiency.

[0058] As an implementable manner, as Figure 2 and 3 shown, it further includes a communication unit 50. The communication unit 50 is respectively connected to the charge-discharge device 40 and the controller 30;

[0059] The charge-discharge device 40 is configured to send a mode signal to the controller 30 through the communication unit 50. The mode signal includes a charging mode signal, a discharging mode signal or a stationary mode signal.

[0060] Among them, the communication unit 50 is mainly used for communication between the controller 30 and the charge-discharge device 40. The communication unit 50 can perform information transmission in a wired or wireless manner. For example, when the communication unit 50 performs information transmission in a wireless manner, the communication unit 50 can adopt, but is not limited to, WiFi, GPRS or ZigBee signals, as long as the information transmission between the controller 30 and the charge-discharge device 40 can be realized.

[0061] It can be understood that the charging mode signal is a mode signal for indicating the charging mode, the discharging mode signal is a mode signal for indicating the discharging mode, and the stationary mode signal is a mode signal for indicating the stationary mode; among them, in the stationary mode, neither the charging mode nor the discharging mode is executed, and all the switching members 20 are in the on state to maintain the external voltage and avoid test interruption.

[0062] It can also be understood that the charge and discharge device 40 controls the communication unit 50 to send a mode signal to the controller 30, and the controller 30 can also control the communication unit 50 to send a corresponding response signal. For example, when the charge and discharge device 40 sends a charging mode signal to the controller 30, after receiving the charging mode signal and controlling the working state of the switching device 20, the controller 30 can control the communication unit 50 to send a response message, and the response message is used to indicate that the switching device 20 is in a state of connecting the charging circuit. This is beneficial for the charge and discharge device 40 to determine that the currently tested charging circuit is working properly according to the response message, ensuring the normal operation of the energy storage device 10 while improving work efficiency.

[0063] The communication unit 50 of this embodiment is conducive to realizing automatic control without manual operation, thereby being beneficial to improving production efficiency.

[0064] As an implementable manner, the controller 30 is further configured to receive a mode signal and control the switching device 20 to be in a first working state or a second working state according to the charging mode signal or the discharging mode signal.

[0065] In this embodiment, after the controller 30 receives the charging mode signal or the discharging mode signal in the structure, the controller 30 controls the corresponding switch in the switching device 20 to be turned on or off, so as to realize turning on the charging circuit for charging test or turning on the discharging circuit for discharging test.

[0066] In a preferred embodiment, before controlling the switching device 20 to be in the first working state or the second working state, the controller 30 is further configured to,

[0067] control the switching device 20 to be in a static state according to the static mode signal, and the static state means that at least two switches (specifically, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4) are turned on simultaneously.

[0068] In this embodiment, by controlling the switch to be in a static state, it is beneficial to connect to a new circuit and then disconnect the original circuit, so as to ensure that the externally collected voltage does not drop and cause the test to be interrupted, save power consumption, and ensure the continuous progress of the test process.

[0069] In some embodiments, the sending time of the charging mode signal or the sending time of the discharging mode signal is after the sending time of the static mode signal.

[0070] In this embodiment, by limiting the sending time of the charging mode signal or the sending time of the discharging mode signal, it is beneficial to ensure that before switching to the charging circuit or the discharging circuit, all the switching devices 20 are turned on, avoid directly disconnecting the original circuit and causing the test to be interrupted, and thus be beneficial to maintaining the externally collected voltage, not interfering with the original charge and discharge test, and avoiding the test from being interrupted.

[0071] As an implementable manner, the transmission time of the charging mode signal or the transmission time of the discharging mode signal is after the transmission time of the static mode signal, including:

[0072] The charging and discharging device 40 internally presets a holding duration of the static state;

[0073] After the charging and discharging device 40 sends the static mode signal and before the end of the holding duration, the charging and discharging device 40 sends the charging mode signal or the discharging mode signal to the controller 30.

[0074] Among them, the holding duration is preset inside the charging and discharging device according to actual test requirements. As long as the holding duration can ensure that the voltage of the entire test device is maintained, the controller 30 controls the switching element 20 to change the working state.

[0075] In this embodiment, before the end of the holding duration, the charging and discharging device 40 sends the charging mode signal or the discharging mode signal to the controller 30, which is beneficial to reliably switching the charging circuit or the discharging circuit while not affecting the original charging and discharging process.

[0076] Exemplarily, it can be understood that the mode signal sent by the charging and discharging device 40 corresponds one-to-one to the phase of the switching element 20 (that is, the on or off state of each switch). Exemplarily, as shown in Table 1:

[0077] Table 1 Relationship diagram of mode signal and phase of switching element 20

[0078]

[0079] Table 2 Transmission timing of mode signal

[0080]

[0081] As can be seen from Table 1 and Table 2, the currently connected circuit is the charging circuit. That is, the charge and discharge device 40 sends a charging mode signal to the controller 30, and the corresponding signal value can be recorded as 01. Therefore, the controller 30 controls the switch to be in the first working state (i.e., Phase 1). At this time, the first switch KM1 and the second switch KM2 are closed and connected, and the third switch KM3 and the fourth switch KM4 are disconnected. When it is necessary to switch from the charging circuit to the discharging circuit, the charge and discharge device 40 sends a static mode signal (the corresponding signal value can be recorded as 02) to the controller 30. The controller 30 controls the switch device 20 to be in the static state (i.e., Phase 2). At this time, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are all closed and connected. The switch device 20 is in the static state for a certain period of time. When the static state is approaching the end, the charge and discharge device 40 sends a discharging mode signal (the corresponding signal value can be recorded as 03) to the controller 30. The controller 30 controls the switch device 20 to be in the second working state (i.e., Phase 3). At this time, the first switch KM1 and the second switch KM2 are disconnected, and the third switch KM3 and the fourth switch KM4 are closed and connected, realizing the switching from the charging circuit to the discharging circuit; similarly, the switching from the discharging circuit to the charging circuit is the same as above.

[0082] As can be seen from Table 1 and Table 2, the charge and discharge device 40 can also send an abnormal signal (the corresponding signal value can be recorded as 04) to the controller 30. After receiving the abnormal signal, the controller 30 controls the switch device 20 to be in the shutdown state (i.e., Phase 4). At this time, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are all disconnected.

[0083] As an implementable method and an optional solution, the controller 30 is further configured to collect the current value of the circuit between the energy storage device 10 and the charge and discharge device 40, and determine the current working state of the switch device 20 according to the current value.

[0084] In this embodiment, by collecting the current value, the controller 30 can reliably determine the current working state of the switch device 20 through the current value; specifically, the controller 30 internally presets the preset range of the current value of the switch device 20 in different working states. If the collected current value is within the preset range, it means that the current working state of the switch device 20 is in the normal working state (the above-mentioned first working state, second working state, and static state). If the collected current value is not within the preset range, it means that the current working state of the switch device 20 is abnormal.

[0085] Exemplarily, the controller 30 internally presets that when the switch is in the first working state, the range of the current value is positive. If the current value collected by the controller 30 is negative at this time, it means that the working state of the switch device 20 is abnormal.

[0086] In some embodiments, the current values include a first current value, a second current value, and a third current value. The first current value is used to indicate that the current working state is determined to be the first working state, the second current value is used to indicate that the current working state is the stationary state, and the third current value is used to indicate that the current working state is the third working state.

[0087] Among them, the first current value, the second current value, and the third current value can be specific numerical values, and of course, they can also be range values.

[0088] The first current value, the second current value, and the third current value in this embodiment are in one-to-one correspondence with the working state (which can also be the phase) of the switch 20, which is beneficial for the controller 30 to further determine the current working state of the switch 20, and then ensure the reliable operation of the entire test device.

[0089] In some embodiments, the current value further includes an abnormal current value. After the controller 30 acquires the abnormal current value, the controller 30 is further configured to determine the current working state of the switch 20 according to the abnormal current value.

[0090] The abnormal current value here refers to a current value that does not match the current working state of the switch 20. For example, if the current working state of the switch 20 is the first working state, the acquired current value should be the first current value. If the actually acquired current value is the second current value, then the current value at this time is determined to be an abnormal current value.

[0091] It can be understood that based on the abnormal current value, the controller 30 can directly control all the switches of the switch 20 to disconnect, so that the switch 20 is in a shutdown state; of course, the controller 30 can also send an abnormal signal to the charge and discharge device 40, and the charge and discharge device 40 controls the switch 20 to be in a shutdown state according to the received abnormal signal.

[0092] In a preferred embodiment, the controller 30 determines that the current working state of the switch 20 is the shutdown state according to the abnormal current value, including:

[0093] The controller 30 is further configured to control the communication unit 50 to send an abnormal signal to the charge and discharge device 40;

[0094] The charge and discharge device 40 is further configured to receive the abnormal signal and send a shutdown signal to the controller 30 according to the abnormal signal;

[0095] The controller 30 is further configured to receive the shutdown signal and control the current working state of the switch 20 to be the shutdown state according to the shutdown signal. The shutdown state means that at least two switches (specifically, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4) are simultaneously disconnected.

[0096] In this embodiment, the controller 30 controls the switch 20 to the shutdown state by receiving the shutdown signal sent by the charge and discharge device 40, which is conducive to the charge and discharge device 40 automatically shutting down according to the received abnormal signal and disconnecting the external voltage, conducive to ensuring the safe operation of the entire test device, and avoiding damage to the charge and discharge device 40 or the energy storage device 10 itself due to excessive local current.

[0097] It can be understood that the controller 30 sends corresponding abnormal signal values to the charge and discharge device 40 according to different abnormal current values. For example, as shown in Table 3:

[0098] Table 3 Abnormal signals corresponding to abnormal current values

[0099] Phase Abnormal current value state CAN signal value Phase1 (charging) Current < -1 A E1 Phase2 Absolute value of current > 1A E2 Phase3 (discharging) Current > 1A E3

[0100] It can be seen from Table 3 that when the charging circuit is connected and the switch is in the first working state (that is, Phase1), the abnormal current value is <-1A, and the corresponding abnormal signal is E1; when the switch 20 is in the static state (that is, Phase2), the abnormal current value is >1A, and the corresponding abnormal signal is E2; when the switch 20 is in the second working state (that is, Phase3), the abnormal current value >1A, and the corresponding abnormal signal is E3.

[0101] For example, when the switch 20 is in the Phase1 phase, if the controller 30 collects the discharge current, that is, the current value is negative, then the current value at this time is the abnormal current value, and the controller 30 sends an abnormal signal to the charge and discharge device 40 (for example: 0x701 = E1), and the charge and discharge machine makes a shutdown protection.

[0102] As an implementable manner, the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 each include at least one relay and / or MOS transistor.

[0103] It can be understood that the first switch KM1 can be a relay or a MOS transistor, and the first switch KM1 can also be a series connection of a relay and a MOS transistor; the second switch KM2 can be a relay or a MOS transistor, and the second switch KM2 can also be a series connection of a relay and a MOS transistor; the third switch KM3 can be a relay or a MOS transistor, and the third switch KM3 can also be a series connection of a relay and a MOS transistor; the fourth switch KM4 can be a relay or a MOS transistor, and the fourth switch KM4 can also be a series connection of a relay and a MOS transistor; the embodiments of the present application do not make specific limitations on this, and it is specifically determined according to the actual test conditions.

[0104] In some embodiments, resistors or diodes can also be connected in series on the circuits connected by the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 respectively.

[0105] In a preferred embodiment, the controller 30 and the switch member 20 are integrally disposed in the tooling box.

[0106] In this embodiment, integrating the controller 30 and the switch member 20 in the tooling box is beneficial for the tooling box to be applicable to a variety of different test scenarios, improving the applicability of the tooling box. At the same time, it is also beneficial for the entire charge and discharge test device

[0107] In a preferred embodiment, the communication unit 50 uses CAN signal communication. The communication unit 50 in this embodiment uses CAN signal communication. The CAN signal has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference ability, low cost, and can work in a high-noise interference environment.

[0108] In summary, for the charge and discharge switching device of the embodiment of the present application, by providing the switch member 20 and the controller 30, the control end of the switch member 20 is connected to the controller 30. The controller 30 controls the switch connected to the charging port 11 in the switch member 20 to be turned on and the switch connected to the discharging port 12 to be turned off in the charging mode; the controller 30 controls the switch connected to the discharging port 12 in the switch member 20 to be turned on and the switch connected to the charging port 11 to be turned off in the discharging mode, so as to realize switching on of the charging circuit or switching on of the discharging circuit. There is no need to set two test channels, saving the number of channels, and through automatic switching by the controller 30, it is beneficial to liberate manpower and improve production efficiency;

[0109] Moreover, before the controller 30 controls the switch member 20 to be in the first working state or the second working state, controlling the switch member 20 to be in a static state is beneficial for ensuring that the externally collected voltage does not drop, thereby avoiding test interruption.

[0110] Next, a specific embodiment is used to illustrate the charge and discharge test device of the present invention.

[0111] Such as Figures 1-3As shown, the charge and discharge test device 100 includes an energy storage device 10, a tooling box, and a charge and discharge device 40. Among them, the energy storage device 10 has a charging port 11 and a discharging port 12. Inside the tooling box, a switch member 20 and a controller 30 are provided. The switch member 20 includes a first switch KM1, a second switch KM2, a third switch KM3, and a fourth switch KM4. The first ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are connected to the charge and discharge device 40. The second ends of the first switch KM1 and the second switch KM2 are respectively connected to the positive and negative interfaces of the charging port 11. The second ends of the third switch KM3 and the fourth switch KM4 are respectively connected to the positive and negative interfaces of the discharging port 12. The control ends of the first switch KM1, the second switch KM2, the third switch KM3, and the fourth switch KM4 are respectively connected to the controller 30. Information interaction between the controller 30 and the charge and discharge device 40 is carried out through a communication unit 50. Specifically, a CAN box is also provided on the tooling box, and a CAN box is provided on the charge and discharge device 40.

[0112] The controller 30 controls the working state of the switch member 20 according to the mode signal sent by the charge and discharge device 40. Among them, the mode signal includes a charging mode signal, a discharging mode signal, and a static mode signal. The controller 30 controls the switch member 20 to be in a first working state according to the charging mode signal, in a second working state according to the discharging mode signal, and in a static mode state according to the static mode signal. In the first working state, the first switch KM1 and the second switch KM2 are closed, and the third switch KM1 and the fourth switch KM2 are open. In the second working state, the first switch KM1 and the second switch KM2 are open, and the third switch KM1 and the fourth switch KM2 are closed. In the static mode state, the first switch KM1, the second switch KM2, the third switch KM1, and the fourth switch KM2 are all closed, so as to realize the switching of the charging circuit and the discharging circuit while ensuring that the test is not interrupted.

[0113] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A charge and discharge test device, characterized in that: include: A charging and discharging device, wherein the charging and discharging device is respectively used to be electrically connected to a charging port of the energy storage device and a discharging port of the energy storage device; A switch component, comprising at least two switches, wherein the at least two switches are respectively connected to the charging port and the discharging port so that the charging circuit and the discharging circuit are connected in parallel; wherein the charging circuit refers to a circuit between the charging and discharging device and the charging port, and the discharging circuit refers to a circuit between the charging and discharging device and the charging port; A controller, wherein the controller is connected to control ends of the at least two switches respectively; The controller is used to control the switch element to be in a first working state in a charging mode, wherein the first working state means that the switch connected to the discharge port in the switch element is disconnected, and the switch connected to the charging port is connected; The controller is also used to control the switch element to be in a second working state in the discharge mode, wherein the second working state means that the switch connected to the charging port in the switch element is disconnected, and the switch connected to the discharge port is connected.

2. The charge and discharge test device according to claim 1, characterized in that: The switch element includes a first switch, a second switch, a third switch and a fourth switch, wherein a first end of the first switch, a first end of the second switch, a first end of the third switch and a first end of the fourth switch are respectively connected to the charging and discharging device, and two of the second ends of the first switch, the second end of the second switch, the second end of the third switch and the second end of the fourth switch are respectively connected to the charging port, and the remaining two are respectively connected to the discharging port.

3. The charge and discharge test device according to claim 1, characterized in that: It also includes a communication unit, which is connected to the charging and discharging device and the controller respectively; The charging and discharging device is used to send a mode signal to the controller through the communication unit, and the mode signal includes a charging mode signal, a discharging mode signal or a static mode signal.

4. The charge and discharge test device according to claim 3, characterized in that: The controller is further configured to receive the mode signal, and control the switch element to be in the first working state or the second working state according to the charging mode signal or the discharging mode signal.

5. The charge and discharge test device according to claim 3, characterized in that: Before controlling the switch element to be in the first working state or the second working state, the controller is further used to: The switch element is controlled to be in a static state according to the static mode signal, and the static state means that the at least two switches are turned on at the same time.

6. The charge and discharge test device according to claim 3, characterized in that: The sending time of the charging mode signal or the sending time of the discharging mode signal is after the sending time of the standing mode signal.

7. The charge and discharge test device according to claim 6, characterized in that: The sending time of the charging mode signal or the sending time of the discharging mode signal is after the sending time of the static mode signal, including: The charging and discharging device is preset with a retention time of the static state; After the charging and discharging device sends the static mode signal and before the holding time ends, the charging and discharging device sends the charging mode signal or the discharging mode signal to the controller.

8. The charge and discharge test device according to claim 1, characterized in that: The controller is also used to collect the current value of the loop between the energy storage device and the charging and discharging device, and determine the current working state of the switch element according to the current value.

9. The charge and discharge test device according to claim 8, characterized in that: The current value includes a first current value, a second current value and a third current value. The first current value is used to indicate that the current working state is the first working state, the second current value is used to indicate that the current working state is a static state, and the third current value is used to indicate that the current working state is the third working state.

10. The charge and discharge test device according to claim 8, characterized in that: The current value also includes an abnormal current value. After the controller collects the abnormal current value, the controller is further configured to determine a current working state of the switch component according to the abnormal current value.

11. The charge and discharge test device according to claim 10, characterized in that: The controller determines that the current working state of the switch element is a shutdown state according to the abnormal current value, including: The controller is also used to control the communication unit to send an abnormal signal to the charging and discharging device; The charging and discharging device is also used to receive the abnormal signal and send a shutdown signal to the controller according to the abnormal signal; The controller is further configured to receive the shutdown signal and control the current working state of the switch element to be a shutdown state according to the shutdown signal, wherein the shutdown state means that the at least two switches are disconnected at the same time.

12. The charge and discharge test device according to any one of claims 1 to 11, characterized in that: Each of the switches includes at least one relay and / or MOS tube.

13. The charge and discharge test device according to any one of claims 1 to 11, characterized in that: The controller and the switch element are integrated in a tooling box.

14. The charge and discharge test device according to any one of claims 3 to 11, characterized in that: The communication unit uses CAN signal communication.

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