Soft package lithium battery circuit detection device

Abstract

The utility model provides a soft package lithium battery circuit detection device, which comprises a battery detection module, a circuit detection module and a programmable logic controller (PLC), a lithium battery to be detected is connected in series with the battery detection module and the circuit detection module to form a series circuit; the PLC programmable controller is connected with the battery detection module and the circuit detection module; the battery detection module and the circuit detection module are respectively used for detecting the voltage of the series circuit; and the PLC is used for outputting a circuit detection result corresponding to the voltage of the series circuit. By adopting the device, the circuit voltage of the soft package lithium battery is detected, and the accuracy of a detection result is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery detection, in particular to a soft-pack lithium battery circuit detection device. Background Art

[0002] When producing soft-pack batteries, it is necessary to perform a side voltage test on the battery. Whether the test voltage is within the standard range is used to determine whether the quality of the produced battery meets the production standards. In the prior art, a single test meter is usually used when performing a side voltage test on the battery. One end of the test meter is connected to the battery aluminum-plastic film, and the other end is connected to the battery tab to detect the side voltage of the battery. The battery quality is then evaluated based on the collected voltage.

[0003] However, the study found that when using the above-mentioned single test instrument to detect the battery side voltage, the detection circuit may be disconnected, the contact may be poor, or the test instrument may malfunction. In this case, the battery side voltage test results may be inaccurate or erroneous, which may further lead to misjudgment of the battery quality, causing the outflow of defective batteries and posing a safety hazard. Utility Model Content

[0004] The utility model aims to provide a soft-pack lithium battery circuit detection device to detect the circuit voltage of the soft-pack lithium battery and improve the accuracy of the detection result.

[0005] The present application provides a soft-pack lithium battery circuit detection device, the device comprising a battery detection module, a circuit detection module and a PLC programmable controller; the lithium battery to be detected is connected in series with the battery detection module and the circuit detection module to form a series circuit; the PLC programmable controller is connected with the battery detection module and the circuit detection module;

[0006] The battery detection module and the circuit detection module are respectively used to detect the voltage of the series circuit; the PLC programmable controller is used to output a circuit detection result corresponding to the voltage of the series circuit.

[0007] Optionally, the device further comprises a first bayonet and a second bayonet;

[0008] The first bayonet and the second bayonet are both in contact with the aluminum-plastic film of the lithium battery to be detected, the battery detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet, and the circuit detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet.

[0009] Optionally, the battery detection module includes a first voltmeter, and the circuit detection module includes a second voltmeter and a third voltmeter;

[0010] The positive electrode of the first voltmeter is connected to the positive electrode ear of the lithium battery to be tested, and the negative electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be tested;

[0011] The positive pole of the second voltmeter is connected to the positive pole ear of the lithium battery to be tested, the negative pole of the second voltmeter and the positive pole of the third voltmeter are respectively connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the negative pole of the third voltmeter is connected to the negative pole ear of the lithium battery to be tested.

[0012] Optionally, the device further includes a first intermediate relay, a second intermediate relay, a third intermediate relay and a fourth intermediate relay;

[0013] One end of the first contact of the first intermediate relay is connected to the positive terminal of the lithium battery to be detected, and the other end is connected to the positive terminal of the first voltmeter; one end of the second contact of the first intermediate relay is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet, and the other end is connected to the negative terminal of the first voltmeter;

[0014] One end of the first contact of the second intermediate relay is connected to the negative electrode ear of the lithium battery to be tested, and the other end is connected to the positive electrode of the first voltmeter; one end of the second contact of the second intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the first bayonet, and the other end is connected to the negative electrode of the first voltmeter;

[0015] One end of the first contact of the third intermediate relay is connected to the positive terminal of the lithium battery to be tested, and the other end is connected to the positive terminal of the second voltmeter; one end of the second contact of the third intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the other end is connected to the negative terminal of the second voltmeter;

[0016] One end of the first contact of the fourth intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the other end is connected to the positive pole of the third voltmeter; one end of the second contact of the fourth intermediate relay is connected to the negative pole ear of the lithium battery to be tested, and the other end is connected to the negative pole of the third voltmeter.

[0017] Optionally, the PLC programmable controller is respectively connected to the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay; the PLC programmable controller can respectively control the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay, the second contact of the third intermediate relay, the first contact of the fourth intermediate relay, and the second contact of the fourth intermediate relay to be attracted.

[0018] Optionally, the PLC programmable controller is used to control the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the fourth intermediate relay and the second contact of the fourth intermediate relay to be simultaneously attracted, or to control the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay and the second contact of the third intermediate relay to be simultaneously attracted.

[0019] Optionally, the device further comprises a positive electrode test probe; one end of the positive electrode test probe contacts the positive electrode ear of the lithium battery to be tested, and the other end of the positive electrode test probe is connected to the battery detection module.

[0020] Optionally, the device further comprises a negative electrode test probe; one end of the negative electrode test probe contacts the negative electrode ear of the lithium battery to be tested, and the other end of the negative electrode test probe is connected to the circuit detection module.

[0021] Optionally, the circuit detection module is used to output a qualified signal to the PLC programmable controller when the voltage detected by it is within a preset range;

[0022] The PLC programmable controller is used to output a circuit detection result indicating that the circuit has passed the detection after receiving the qualified signal for a first preset time period.

[0023] Optionally, the PLC programmable controller is used to output a circuit detection result indicating that the circuit detection is unqualified when the qualified signal is not received for a second preset time period.

[0024] The technical solution provided by this application includes but is not limited to the following beneficial effects:

[0025] The present application controls the intermediate relay to realize that the positive and negative pole test probes, bayonet, voltmeter and battery form two different series circuits, and uses the series voltage division principle to allow the voltmeter to monitor the circuit voltage for judgment, so that any disconnection or poor contact at any point in the circuit can be detected at the first time, thereby realizing accurate detection of the battery side voltage detection circuit, which can avoid missed detection and misdetection of the battery edge voltage test due to abnormalities in the circuit or various points, avoid the outflow of defective batteries, and improve product quality and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of a soft-pack lithium battery circuit detection device provided by the utility model is shown;

[0028] Figure 2 The structure diagram of the second soft-pack lithium battery circuit detection device provided by the utility model is shown;

[0029] Figure 3 The schematic diagram of the structure of the third soft-pack lithium battery circuit detection device provided by the utility model is shown;

[0030] Figure 4 A schematic diagram showing the structure of a fourth soft-pack lithium battery circuit detection device provided by the utility model;

[0031] Figure 5 The structure diagram of the fifth soft-pack lithium battery circuit detection device provided by the utility model is shown;

[0032] Figure 6 A schematic diagram showing the structure of a sixth soft-pack lithium battery circuit detection device provided by the utility model is shown;

[0033] Figure 7 A structural schematic diagram of a seventh soft-pack lithium battery circuit detection device provided by the utility model is shown. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do 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 should not be understood as a limitation on the present utility model.

[0038] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] To facilitate understanding of this application, Figure 1 The utility model provides a structural schematic diagram of a soft-pack lithium battery circuit detection device to explain the application in detail.

[0041] See also Figure 1 As shown, Figure 1 A structural schematic diagram of a soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the device comprises a battery detection module 1, a circuit detection module 2 and a PLC programmable controller 3; the lithium battery to be detected is connected in series with the battery detection module 1 and the circuit detection module 2 to form a series circuit; the PLC programmable controller 3 is connected with the battery detection module 1 and the circuit detection module 2; the battery detection module 1 and the circuit detection module 2 are respectively used to detect the voltage of the series circuit; the PLC programmable controller 3 is used to output a circuit detection result corresponding to the voltage of the series circuit.

[0042] Specifically, the lithium battery to be tested is connected in series with the battery detection module and the circuit detection module to form a series circuit, so that the battery detection module and the circuit detection module can simultaneously detect the voltage of the circuit using the series voltage division principle. When an abnormality occurs in the circuit, the voltage detected by the battery detection module and / or the circuit detection module will also change.

[0043] Specifically, when the lithium battery to be detected is abnormal or the circuit contact is poor, the voltage values ​​detected by the battery detection module and the circuit detection module will change; and when one of the battery detection module or the circuit detection module is abnormal, the voltage value detected by the other detection module that is not abnormal will also change. Therefore, by using the battery detection module and the circuit detection module to detect the voltage of the circuit at the same time, it is possible to output the circuit detection result through the PLC programmable controller in time when the circuit is abnormal when any point in the circuit is disconnected, the contact is poor, or a detection module is unavailable. When the circuit detection result is that the circuit detection is qualified, it means that each module, device and connection in the circuit are normal, and the battery side voltage detection can be performed through the circuit, and the obtained side voltage detection result is effective and accurate. On the contrary, when the circuit detection result is that the circuit detection is unqualified, it means that each module, device and connection in the circuit is abnormal, and the detection result obtained after the battery side voltage detection is performed through the circuit is inaccurate or invalid.

[0044] In one possible embodiment, see Figure 2 As shown, Figure 2 A structural schematic diagram of a second soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the device also includes a first bayonet 4 and a second bayonet 5; the first bayonet 4 and the second bayonet 5 are both in contact with the aluminum-plastic film of the lithium battery to be detected, the battery detection module 1 is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet 4, and the circuit detection module 2 is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet 5.

[0045] Specifically, the battery detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet, and the circuit detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet. The aluminum-plastic film is a conductor. The battery detection module can be connected to the circuit detection module through the wire between it and the first bayonet and the wire between the second bayonet and the circuit detection module to form a path.

[0046] In one possible embodiment, see Figure 3 As shown, Figure 3 A schematic structural diagram of a third soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the battery detection module 1 includes a first voltmeter 11 , and the circuit detection module 2 includes a second voltmeter 21 and a third voltmeter 22 .

[0047] The positive electrode of the first voltmeter 11 is connected to the positive electrode ear of the lithium battery to be tested, and the negative electrode of the first voltmeter 11 is connected to the aluminum-plastic film of the lithium battery to be tested.

[0048] Specifically, when the positive electrode of the first voltmeter is connected to the positive electrode ear of the lithium battery to be detected, and the negative electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, when the circuit detection module is short-circuited, the first voltmeter measures the positive electrode side voltage of the lithium battery to be detected. Another connection method is that the positive electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, and the negative electrode of the first voltmeter is connected to the negative electrode ear of the lithium battery to be detected. When the circuit detection module is short-circuited, the first voltmeter measures the negative electrode side voltage of the lithium battery to be detected.

[0049] The positive pole of the second voltmeter 21 is connected to the positive pole ear of the lithium battery to be detected, the negative pole of the second voltmeter 21 and the positive pole of the third voltmeter 22 are connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet 5 respectively, and the negative pole of the third voltmeter 22 is connected to the negative pole ear of the lithium battery to be detected.

[0050] Specifically, when the positive electrode of the first voltmeter is connected to the positive electrode ear of the lithium battery to be detected, and the negative electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, a path of the positive electrode ear of the lithium battery to be detected-first voltmeter-third voltmeter to the negative electrode ear of the lithium battery to be detected is formed, and the circuit is tested for voltage by the first voltmeter (belonging to the battery detection module) and the third voltmeter (belonging to the circuit detection module). When the positive electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, and the negative electrode of the first voltmeter is connected to the negative electrode ear of the lithium battery to be detected, a path of the positive electrode ear of the lithium battery to be detected-second voltmeter-first voltmeter-negative electrode ear of the lithium battery to be detected is formed, and the circuit is tested for voltage by the second voltmeter (belonging to the circuit detection module) and the first voltmeter (belonging to the battery detection module).

[0051] In one possible embodiment, see Figure 4 As shown, Figure 4 A structural schematic diagram of a fourth soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the device also includes a first intermediate relay 6, a second intermediate relay 7, a third intermediate relay 8 and a fourth intermediate relay 9; one end of the first contact of the first intermediate relay 6 is connected to the positive ear of the lithium battery to be detected, and the other end is connected to the positive electrode of the first voltmeter 11; one end of the second contact of the first intermediate relay 6 is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet 4, and the other end is connected to the negative electrode of the first voltmeter 11; one end of the first contact of the second intermediate relay 7 is connected to the negative ear of the lithium battery to be detected, and the other end is connected to the positive electrode of the first voltmeter 11; one end of the second contact of the second intermediate relay 7 is connected to the negative ear of the lithium battery to be detected, and the other end is connected to the positive electrode of the first voltmeter 11; one end of the second contact of the second intermediate relay 7 is connected to the positive electrode of the first voltmeter 11 through the first bayonet 4. A bayonet 4 is connected to the aluminum-plastic film of the lithium battery to be detected, and the other end is connected to the negative pole of the first voltmeter 11; one end of the first contact of the third intermediate relay 8 is connected to the positive ear of the lithium battery to be detected, and the other end is connected to the positive pole of the second voltmeter 21; one end of the second contact of the third intermediate relay 8 is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet 5, and the other end is connected to the negative pole of the second voltmeter 21; one end of the first contact of the fourth intermediate relay 9 is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet 5, and the other end is connected to the positive pole of the third voltmeter 22; one end of the second contact of the fourth intermediate relay 9 is connected to the negative ear of the lithium battery to be detected, and the other end is connected to the negative pole of the third voltmeter 22.

[0052] Specifically, the intermediate relay used in the present application is a double-contact relay. When all the contacts in a certain intermediate relay are energized, the intermediate relay is turned on.

[0053] In one possible embodiment, see Figure 5 As shown, Figure 5 A structural schematic diagram of the fifth soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the PLC programmable controller 3 is respectively connected to the first intermediate relay 6, the second intermediate relay 7, the third intermediate relay 8 and the fourth intermediate relay 9; the PLC programmable controller 3 can respectively control the first contact of the first intermediate relay 6, the second contact of the first intermediate relay 6, the first contact of the second intermediate relay 7, the second contact of the second intermediate relay 7, the first contact of the third intermediate relay 8, the second contact of the third intermediate relay 8, the first contact of the fourth intermediate relay 9, and the second contact of the fourth intermediate relay 9 to be attracted.

[0054] Specifically, the PLC programmable controller can control each contact in each intermediate relay to control its closing or opening. In the present application, when the PLC programmable controller controls each intermediate relay, each contact in each intermediate relay is synchronously controlled.

[0055] In a feasible implementation scheme, the PLC programmable controller 3 is used to control the first contact of the first intermediate relay 6, the second contact of the first intermediate relay 6, the first contact of the fourth intermediate relay 9 and the second contact of the fourth intermediate relay 9 to be simultaneously attracted, or to control the first contact of the second intermediate relay 7, the second contact of the second intermediate relay 7, the first contact of the third intermediate relay 8 and the second contact of the third intermediate relay 8 to be simultaneously attracted.

[0056] Specifically, when the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the fourth intermediate relay, and the second contact of the fourth intermediate relay are simultaneously energized (the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay, and the second contact of the third intermediate relay are disconnected, that is, the second intermediate relay and the third intermediate relay are disconnected), the first intermediate relay and the fourth intermediate relay are both turned on (at this time, the positive pole of the first voltmeter is connected to the positive ear of the lithium battery to be detected, the negative pole of the first voltmeter is connected to the aluminum-plastic film of the positive ear of the lithium battery to be detected, the positive pole of the third voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, and the negative pole of the third voltmeter is connected to the negative ear of the lithium battery to be detected). At this time, a loop is formed from the positive ear of the lithium battery to be detected-the first voltmeter-the third voltmeter-the negative ear of the lithium battery to be detected. If there is no abnormality in the circuit (each module and node is in normal contact and there is no abnormality in itself), the voltage measured by the third voltmeter should be half of the rated voltage of the lithium battery to be tested. In other words, when the voltage measured by the third voltmeter is half of the rated voltage of the lithium battery to be tested, there is no abnormality in the circuit. Otherwise, it means that there is an abnormality in the circuit. For example, if the rated voltage of the lithium battery to be tested is 3.3V, if there is no abnormality in the circuit, the third voltmeter should display about 1.67V.

[0057] When the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay and the second contact of the third intermediate relay are simultaneously energized (the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the fourth intermediate relay and the second contact of the fourth intermediate relay are disconnected, that is, the first intermediate relay and the fourth intermediate relay are disconnected), the second intermediate relay and the third intermediate relay are both turned on (at this time, the positive pole of the first voltmeter is connected to the negative pole ear of the lithium battery to be detected, the negative pole of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected, the positive pole of the second voltmeter is connected to the positive pole ear of the lithium battery to be detected, and the negative pole of the second voltmeter is connected to the aluminum-plastic film of the lithium battery to be detected). At this time, a loop is formed from the positive pole ear of the lithium battery to be detected-the second voltmeter-the first voltmeter-the negative pole ear of the lithium battery to be detected. If there is no abnormality in the circuit (each module and node is in normal contact and there is no abnormality in itself), the voltage measured by the second voltmeter should be half of the rated voltage of the lithium battery to be tested. In other words, when the voltage measured by the second voltmeter is half of the rated voltage of the lithium battery to be tested, there is no abnormality in the circuit. Otherwise, it means that there is an abnormality in the circuit. For example, if the rated voltage of the lithium battery to be tested is 3.3V, if there is no abnormality in the circuit, the second voltmeter should show about 1.7V.

[0058] In one possible embodiment, see Figure 6 As shown, Figure 6 A structural schematic diagram of a sixth soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the device also includes a positive electrode test probe 10; one end of the positive electrode test probe 10 is in contact with the positive electrode ear of the lithium battery to be detected, and the other end of the positive electrode test probe 10 is connected to the battery detection module 1.

[0059] In one possible embodiment, see Figure 7 As shown, Figure 7 A structural schematic diagram of the seventh soft-pack lithium battery circuit detection device provided by the utility model is shown, wherein the device also includes a negative electrode test probe 100; one end of the negative electrode test probe 100 is in contact with the negative electrode ear of the lithium battery to be detected, and the other end of the negative electrode test probe 100 is connected to the circuit detection module 2.

[0060] In a feasible implementation scheme, the circuit detection module 2 is used to output a qualified signal to the PLC programmable controller 3 when the voltage detected by the circuit detection module 2 is within a preset range.

[0061] Specifically, the circuit detection module is used to output a qualified signal to the PLC programmable controller when the voltage detected is half of the rated voltage of the lithium battery to be detected (error is allowed). When the rated voltage of the lithium battery to be detected is 3.3V, the preset range is half of it, that is, 1.7V±the allowed error value.

[0062] The PLC programmable controller 3 is used to output a circuit detection result indicating that the circuit detection is qualified after receiving the qualified signal for a first preset time period.

[0063] Specifically, the first preset time length is preferably 3 seconds. When the PLC programmable controller receives the qualified signal for 3 seconds, the programmable controller is used to output a circuit detection result indicating that the circuit detection is qualified.

[0064] In a feasible implementation manner, the PLC programmable controller 3 is used to output a circuit detection result indicating that the circuit detection is unqualified when the qualified signal is not received for a second preset time period.

[0065] Specifically, the second preset time length is preferably 3 seconds. When it fails to receive the qualified signal for 3 seconds, it outputs a circuit detection result indicating that the circuit detection is unqualified.

[0066] Alternatively, a set value of 1V is configured for the circuit detection module. When an abnormality occurs in the circuit, such as poor contact or circuit disconnection, the circuit is open and the voltage value detected by the circuit detection module is less than 1V. The circuit detection module is used to send an unqualified signal to the PLC programmable controller when the voltage value detected is less than a predetermined value; the PLC programmable controller is used to output a circuit detection result indicating that the circuit detection is unqualified after receiving the unqualified signal for a preset period of time.

[0067] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A soft-pack lithium battery circuit detection device, characterized in that: The device comprises a battery detection module, a circuit detection module and a PLC programmable controller; the lithium battery to be detected is connected in series with the battery detection module and the circuit detection module to form a series circuit; the PLC programmable controller is connected with the battery detection module and the circuit detection module; The battery detection module and the circuit detection module are respectively used to detect the voltage of the series circuit; the PLC programmable controller is used to output a circuit detection result corresponding to the voltage of the series circuit.

2. The device according to claim 1, characterized in that The device also includes a first bayonet and a second bayonet; The first bayonet and the second bayonet are both in contact with the aluminum-plastic film of the lithium battery to be detected, the battery detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet, and the circuit detection module is connected to the aluminum-plastic film of the lithium battery to be detected through the second bayonet.

3. The device according to claim 2, characterized in that The battery detection module includes a first voltmeter, and the circuit detection module includes a second voltmeter and a third voltmeter; The positive electrode of the first voltmeter is connected to the positive electrode ear of the lithium battery to be tested, and the negative electrode of the first voltmeter is connected to the aluminum-plastic film of the lithium battery to be tested; The positive pole of the second voltmeter is connected to the positive pole ear of the lithium battery to be tested, the negative pole of the second voltmeter and the positive pole of the third voltmeter are respectively connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the negative pole of the third voltmeter is connected to the negative pole ear of the lithium battery to be tested.

4. The device according to claim 3, characterized in that The device also includes a first intermediate relay, a second intermediate relay, a third intermediate relay and a fourth intermediate relay; One end of the first contact of the first intermediate relay is connected to the positive terminal of the lithium battery to be detected, and the other end is connected to the positive terminal of the first voltmeter; one end of the second contact of the first intermediate relay is connected to the aluminum-plastic film of the lithium battery to be detected through the first bayonet, and the other end is connected to the negative terminal of the first voltmeter; One end of the first contact of the second intermediate relay is connected to the negative electrode ear of the lithium battery to be tested, and the other end is connected to the positive electrode of the first voltmeter; one end of the second contact of the second intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the first bayonet, and the other end is connected to the negative electrode of the first voltmeter; One end of the first contact of the third intermediate relay is connected to the positive terminal of the lithium battery to be tested, and the other end is connected to the positive terminal of the second voltmeter; one end of the second contact of the third intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the other end is connected to the negative terminal of the second voltmeter; One end of the first contact of the fourth intermediate relay is connected to the aluminum-plastic film of the lithium battery to be tested through the second bayonet, and the other end is connected to the positive pole of the third voltmeter; one end of the second contact of the fourth intermediate relay is connected to the negative pole ear of the lithium battery to be tested, and the other end is connected to the negative pole of the third voltmeter.

5. The device according to claim 4, characterized in that The PLC programmable controller is connected to the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively; the PLC programmable controller can respectively control the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay, the second contact of the third intermediate relay, the first contact of the fourth intermediate relay, and the second contact of the fourth intermediate relay to be attracted.

6. The device according to claim 5, characterized in that The PLC programmable controller is used to control the first contact of the first intermediate relay, the second contact of the first intermediate relay, the first contact of the fourth intermediate relay and the second contact of the fourth intermediate relay to be simultaneously attracted, or to control the first contact of the second intermediate relay, the second contact of the second intermediate relay, the first contact of the third intermediate relay and the second contact of the third intermediate relay to be simultaneously attracted.

7. The device according to claim 1, characterized in that The device also includes a positive electrode test probe; one end of the positive electrode test probe is in contact with the positive electrode ear of the lithium battery to be tested, and the other end of the positive electrode test probe is connected to the battery detection module.

8. The device according to claim 1, characterized in that The device also includes a negative electrode test probe; one end of the negative electrode test probe is in contact with the negative electrode ear of the lithium battery to be tested, and the other end of the negative electrode test probe is connected to the circuit detection module.

9. The device according to claim 1, characterized in that The circuit detection module is used to output a qualified signal to the PLC programmable controller when the voltage detected by it is within a preset range; The PLC programmable controller is used to output a circuit detection result indicating that the circuit has passed the detection after receiving the qualified signal for a first preset time period.

10. The device according to claim 9, characterized in that The PLC programmable controller is used to output a circuit detection result indicating that the circuit detection is unqualified when the qualified signal is not received for a second preset period of time.

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