A lithium battery testing system and method

Abstract

The present application proposes a lithium battery testing system and method. When testing the battery, the first cutter cuts into the aluminum-plastic film near the negative electrode of the battery, the first contact device is connected to the negative electrode of the battery, the second cutter cuts into the aluminum-plastic film near the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery; the first contact point, the second contact point, the third contact point and the fourth contact point are respectively drawn out from the first cutter, the first contact device, the second contact device and the second cutter; one end of the resistance detection device, the first resistor and the voltage detection device is connected to the second cutter, and the fifth contact point, the sixth contact point and the seventh contact point are respectively drawn out from the other end of the resistance detection device, the first resistor and the voltage detection device; the control unit is used to control the switching of the connection relationship between the contacts to complete the lithium battery test. The side voltage test and the side resistance test can be compatible and parallel in the test system, which not only reduces the workload, but also has high detection efficiency and accuracy.

Description

Technical Field

[0001] The present application relates to the field of battery testing, and in particular, to a lithium battery testing system and method. Background Art

[0002] Theoretically, the battery cell of a lithium battery and the aluminum layer of the aluminum-plastic film covering the battery cell are insulated, that is, the voltage difference between the two is zero. However, during the actual processing, the inner polymer layer of the aluminum-plastic film, such as the PP layer, may be locally damaged, resulting in local conduction (including electron channels and ion channels) between the battery cell and the aluminum layer of the aluminum-plastic film, forming a microbattery, thereby generating a potential difference. The formation of electron channels and ion channels will cause the lithium ions in the battery cell to alloy with the aluminum of the aluminum-plastic film to generate lithium-aluminum alloy, causing local powdering and penetration of the aluminum-plastic film, posing a safety hazard.

[0003] Therefore, lithium batteries need to be tested for side voltage and side resistance before leaving the factory. Currently, the side voltage and side resistance tests of lithium batteries are two steps, that is, after testing one by a first testing device, the second testing device is used to test the other. The two testing steps are incompatible, which not only increases the workload, but also reduces the detection efficiency and accuracy. Summary of the invention

[0004] The purpose of the present application is to provide a lithium battery testing system and method to at least partially improve the above problems.

[0005] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a lithium battery testing system, the testing system comprising: a control unit and a detection circuit, the detection circuit comprising a first resistor, a resistance detection device, a voltage detection device, a first contact device, a second contact device, a first cutter, and a second cutter;

[0007] When testing the battery, the first cutter cuts into the aluminum-plastic film near the negative electrode of the battery, and the first contact device is connected to the negative electrode of the battery; the second cutter cuts into the aluminum-plastic film near the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery;

[0008] A first contact is led out from the first cutter, a second contact is led out from the first contact device, a third contact is led out from the second contact device, and a fourth contact is led out from the second cutter;

[0009] One end of the resistance detection device, the first resistor and the voltage detection device is connected to the second cutter, and a fifth contact, a sixth contact and a seventh contact are respectively led out from the other ends of the resistance detection device, the first resistor and the voltage detection device;

[0010] The control unit is used to control the switching of the connection relationship among the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test.

[0011] In a second aspect, an embodiment of the present application provides a lithium battery testing method, which is applied to the testing system described in the first aspect, and the method includes:

[0012] The control unit controls the switching of the connection relationship among the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test.

[0013] Compared with the prior art, a lithium battery testing system and method provided by an embodiment of the present application, when testing the battery, a first cutter cuts into the aluminum-plastic film near the negative electrode of the battery, a first contact device is connected to the negative electrode of the battery, a second cutter cuts into the aluminum-plastic film near the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery; a first contact is drawn out at the first cutter, a second contact is drawn out at the first contact device, a third contact is drawn out at the second contact device, and a fourth contact is drawn out at the second cutter; one end of the resistance detection device, the first resistor and the voltage detection device is connected to the second cutter, and a fifth contact, a sixth contact and a seventh contact are drawn out at the other end of the resistance detection device, the first resistor and the voltage detection device respectively; a control unit is used to control the connection relationship switching of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test. The side voltage test and the side resistance test can be compatible and parallel in the test system, which not only reduces the workload, but also has high detection efficiency and accuracy.

[0014] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A connection diagram of a test system provided in an embodiment of the present application;

[0017] Figure 2 Provided for the embodiments of this application Figure 1A schematic diagram of the structure of the detection circuit in FIG.

[0018] Figure 3 A connection diagram of a test system provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the installation of the cutter provided in the embodiment of the present application;

[0020] Figure 5 A partial schematic diagram of a driving structure provided in an embodiment of the present application;

[0021] Figure 6 Another partial schematic diagram of the driving structure provided in an embodiment of the present application;

[0022] Figure 7 One of the structural schematic diagrams of the test system provided in the embodiment of the present application;

[0023] Figure 8 A schematic diagram of a lithium battery testing method provided in an embodiment of the present application;

[0024] Fig. 9 A schematic diagram of the sub-steps of S201 provided in an embodiment of the present application.

[0025] In the figure: 1-first contact; 2-second contact; 3-third contact; 4-fourth contact; 5-fifth contact; 6-sixth contact; 7-seventh contact; 10-detection circuit; 101-first cutter; 102-second cutter; 103-first contact device; 104-second contact device; 20-control unit; 30-battery; 301-aluminum-plastic film; 40-driving structure; 401-first lifting cylinder; 402-first telescopic cylinder; 403-first mounting block; 404-second lifting cylinder; 405-second telescopic cylinder; 406-second mounting block; 407-first limiting unit; 408-second limiting unit; 50-transfer module; 60-transfer unit; 70-transmission structure. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "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 product of the application is usually placed when in use. They are only for the convenience of describing the present application 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 application.

[0031] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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 an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 A connection diagram of a test system provided in an embodiment of the present application, Figure 2 Provided in the embodiments of this application Figure 1 Schematic diagram of the structure of the detection circuit 10. Figure 1 and Figure 2 As shown, an embodiment of the present application provides a lithium battery testing system, the testing system includes: a control unit 20 and a detection circuit 10, the detection circuit 10 includes a first resistor R, a resistance detection device Ω, a voltage detection device V, a first contact device 103, a second contact device 104, a first cutter 101 and a second cutter 102.

[0034] Optionally, the first contact device 103 and the second contact device 104 may be probes or patches, which are not limited here.

[0035] The lithium battery in the embodiment of the present application may be a soft-pack battery.

[0036] When testing the battery 30 , the first cutter 101 cuts into the aluminum-plastic film 301 near the negative electrode of the battery 30 , and the first contact device 103 is connected to the negative electrode of the battery 30 ; the second cutter 102 cuts into the aluminum-plastic film 301 near the positive electrode of the battery 30 , and the second contact device 104 is connected to the positive electrode of the battery 30 .

[0037] A first contact 1 is led out from the first cutter 101 , a second contact 2 is led out from the first contact device 103 , a third contact 3 is led out from the second contact device 104 , and a fourth contact 4 is led out from the second cutter 102 .

[0038] One end of the resistance detection device Ω, the first resistor R and the voltage detection device V is connected to the second cutter 102, and the fifth contact 5, the sixth contact 6 and the seventh contact 7 are respectively led out from the other ends of the resistance detection device Ω, the first resistor R and the voltage detection device V.

[0039] The control unit 20 is used to control the switching of the connection relationship among the first contact 1 , the second contact 2 , the third contact 3 , the fourth contact 4 , the fifth contact 5 , the sixth contact 6 and the seventh contact 7 to complete the lithium battery test.

[0040] The lithium battery test includes the edge voltage test and the edge resistance test. The lithium battery test system provided by the embodiment of the present application can perform the edge voltage test and the edge resistance test, and the two can be compatible and parallel without the need for process switching, which not only reduces the workload, but also has high detection efficiency and accuracy.

[0041] In summary, the lithium battery testing system provided by the embodiment of the present application, when testing the battery, the first cutter cuts into the aluminum-plastic film near the negative electrode of the battery, the first contact device is connected to the negative electrode of the battery, the second cutter cuts into the aluminum-plastic film near the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery; the first contact is drawn out at the first cutter, the second contact is drawn out at the first contact device, the third contact is drawn out at the second contact device, and the fourth contact is drawn out at the second cutter; one end of the resistance detection device, the first resistor and the voltage detection device is connected to the second cutter, and the fifth contact, the sixth contact and the seventh contact are drawn out at the other end of the resistance detection device, the first resistor and the voltage detection device respectively; the control unit is used to control the connection relationship switching of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test. The side voltage test and the side resistance test can be compatible and parallel in the test system, which not only reduces the workload, but also has high detection efficiency and accuracy.

[0042] Optionally, the control unit 20 is directly connected to each contact in the detection circuit 10 or indirectly connected via a relay and / or a switch tube.

[0043] Regarding how to control the switching of the connection relationship between the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact, the embodiment of the present application also provides a possible implementation method, please refer to the following.

[0044] Relays and / or switch tubes are arranged between the contact pairs. The switch tubes may be MOS tubes or triodes. The contact pairs are any two contacts that need to be connected at least once during the test. For example, the first contact 1 and the fifth contact 5, the first contact 1 and the fourth contact 4, and the sixth contact 6 and the second contact 2 are all contact pairs.

[0045] The control unit 20 is connected to the relay and / or the switch tube. The control unit 20 controls the conduction state of the relay and / or the switch tube by issuing a switching instruction, thereby controlling the switching of the connection relationship of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact.

[0046] Please refer to Figure 3 , Figure 3 This is a connection diagram of the test system provided in the embodiment of the present application. Figure 3 As shown, the control unit 20 is connected to the resistance detection device Ω.

[0047] The control unit 20 is used to control the connection between the first contact 1 and the fifth contact 5 to conduct the double cutter self-test circuit. The control unit 20 is used to obtain the current resistance value of the resistance detection device Ω, and when the current resistance value is greater than the preset resistance threshold, determine that the battery 30 is NG.

[0048] Optionally, after the double-cutter self-test circuit is turned on, the current resistance value obtained is the double-cutter contact resistance. If the current resistance value is greater than a preset resistance threshold, it is considered contact failure (contact NG), the measurement is stopped, and the battery is discharged from the NG port for retesting. If the current resistance value is less than or equal to the preset resistance threshold, the contact is OK, and other tests can be further performed.

[0049] The resistance threshold value may be 1 ohm.

[0050] Please continue to refer to Figure 3 , the voltage detection device V is connected to the control unit 20.

[0051] When the current resistance value is less than or equal to a preset resistance threshold, the control unit 20 is also used to control the first contact 1 and the fifth contact 5 to be disconnected, control the first contact 1 and the fourth contact 4 to be connected so that the aluminum-plastic film double cutter circuit is turned on, control the sixth contact 6 and the second contact 2 to be connected so that the aluminum-plastic film capacitor discharge circuit is turned on and after a first preset time period, control the sixth contact 6 and the second contact 2 to be disconnected.

[0052] After the discharge circuit of the aluminum-plastic film capacitor is turned on, the aluminum-plastic film capacitor is discharged for a first preset time. After the first preset time, the sixth contact 6 and the second contact 2 are controlled to be disconnected to disconnect the discharge circuit of the aluminum-plastic film capacitor.

[0053] The first preset time length may be 1 second, or may be specifically set according to the product configuration, and the adjustment step time may be 0.5 seconds.

[0054] After the discharge is completed, the side voltage and side resistance are further tested. The side voltage includes the shell-positive voltage and the shell-negative voltage, and the side resistance includes the shell-positive resistance and the shell-negative resistance.

[0055] The control unit 20 is also used to control the connection between the seventh contact 7 and the third contact 3 to make the shell-positive voltage loop conductive, obtain the shell-positive voltage collected by the voltage detection device V, and control the seventh contact 7 and the third contact 3 to disconnect.

[0056] The control unit 20 is also used to control the connection between the seventh contact 7 and the second contact 2 to make the shell-negative pole voltage loop conductive, obtain the shell-negative voltage collected by the voltage detection device V, and control the seventh contact 7 and the second contact 2 to disconnect.

[0057] The control unit 20 is also used to control the connection between the fifth contact 5 and the second contact 2 to make the shell-negative electrode resistance loop conductive, obtain the shell-negative resistance collected by the voltage detection device V, and control the fifth contact 5 and the second contact 2 to disconnect.

[0058] The control unit 20 is also used to control the connection between the fifth contact 5 and the third contact 3 to make the shell-positive resistance loop conductive, obtain the shell-positive resistance collected by the voltage detection device V, control the fifth contact 5 and the third contact 3 to disconnect, and control the first contact 1 and the fourth contact 4 to disconnect.

[0059] The test system provided in the embodiment of the present application does not need to replace the test device to test the edge voltage and edge resistance, which reduces the workload and improves the detection efficiency. At the same time, the accuracy of the test is also improved without replacing the test device.

[0060] Optionally, after the lithium battery test is completed, the control unit 20 is further configured to control the first contact device 103, the second contact device 104, the first cutter 101 and the second cutter 102 to separate from the battery cell.

[0061] Regarding how to further realize automated operations, the present application embodiment also provides a possible implementation method, please refer to Figure 4 , Figure 4 This is a schematic diagram of the installation of the cutter provided in the embodiment of the present application. Figure 4 As shown, the test system also includes a driving structure 40, and the first cutter 101 and the second cutter 102 are installed on the driving structure 40. The driving structure 40 is used to displace the first cutter 101 and the second cutter 102 to cut the first cutter 101 and the second cutter 102 into the aluminum-plastic film 301 of the battery 30 or drive the first cutter 101 and the second cutter 102 to separate from the battery 30.

[0062] Regarding the specific structure of the driving structure 40, the present application embodiment also provides a possible implementation method, please refer to Figure 5 and Figure 6 , Figure 5 A partial schematic diagram of a driving structure provided in an embodiment of the present application, Figure 6 Another partial schematic diagram of the driving structure provided in an embodiment of the present application.

[0063] like Figure 5 and Figure 6 As shown, the driving structure 40 includes a first mounting block 403 , a first lifting cylinder 401 , a first telescopic cylinder 402 , a first limiting unit 407 , a second mounting block 406 , a second lifting cylinder 404 , a second telescopic cylinder 405 and a second limiting unit 408 .

[0064] The first cutter 101 is mounted on the first mounting block 403 , and the first lifting cylinder 401 is used to drive the first mounting block 403 to move closer to or away from the conveying structure 70 for transporting the battery 30 , for example, to move in the up and down directions.

[0065] The first telescopic cylinder 402 is used to drive the first mounting block 403 to move closer to or away from the second mounting block 406, for example, to move in the horizontal direction.

[0066] The first limiting unit 407 is used to limit the moving distance of the first mounting block 403 driven by the first telescopic cylinder 402, so as to prevent the cutter from penetrating too deeply into the aluminum-plastic film 301 and thus avoid damaging the battery.

[0067] The second cutter 102 is mounted on the second mounting block 406 , and the second lifting cylinder 404 is used to drive the second mounting block 406 to move closer to or away from the conveying structure 70 for transporting the battery 30 , for example, to move in the up and down directions.

[0068] The second telescopic cylinder 405 is used to drive the second mounting block 406 to move closer to or away from the first mounting block 403, for example, to move in the horizontal direction.

[0069] The second limiting unit 408 is used to limit the moving distance of the second mounting block 406 driven by the second telescopic cylinder 405, so as to prevent the cutter from penetrating too deeply into the aluminum-plastic film 301 and thus avoid damaging the battery.

[0070] The limiting unit may be a stopper or a stopper, which is not limited here. The limiting unit may limit the cutting depth of the cutter to between 0 and 1 mm, thereby avoiding damage to the battery.

[0071] Please refer to Figure 7 , Figure 7 This is one of the structural diagrams of the test system provided in the embodiment of the present application. Figure 7 As shown, the test system further includes a transfer module 50, which is used to transfer the battery 30 on the conveying structure 70 to the space corresponding to the trigger instruction under the condition of receiving the trigger instruction. For example, the battery 30 on the conveying structure 70 is transferred to the NG product station. The transfer module 50 can be a mechanical gripper or a mechanical arm.

[0072] Optionally, the testing system further includes a transfer unit 60 and a conveying structure 70 , and both the transfer unit 60 and the conveying structure 70 are used to transport the battery, and may be a transmission track or a conveyor belt.

[0073] The embodiment of the present application also provides a lithium battery testing method, which is applied to the testing system described above.

[0074] Please refer to Figure 8 , Figure 8 The following is a flow chart of the lithium battery testing method provided in the embodiment of the present application. Figure 8 As shown, the lithium battery testing method includes: S101 and S201, which are specifically described as follows.

[0075] S101, when it is confirmed that the conveying structure transports the battery to the target interval, the driving structure is controlled to move so that the first cutter cuts into the aluminum-plastic film close to the negative electrode of the battery, the first contact device is connected to the negative electrode of the battery, and the second cutter cuts into the aluminum-plastic film close to the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery.

[0076] S201, the control unit controls the connection relationship switching of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test.

[0077] exist Figure 8 Based on the content in S201, the present application embodiment also provides a possible implementation method, please refer to Fig. 9 , S201 includes: S201-1, S201-2, S201-3, S201-4, S201-5, S201-6 and S201-7, which are specifically described as follows.

[0078] S201-1, the control unit controls the first contact and the fifth contact to be connected so that the double-cutter self-checking circuit is turned on.

[0079] S201-2, the control unit obtains the current resistance value of the resistance detection device, and when the current resistance value is greater than a preset resistance threshold, determines that the battery is a NG product.

[0080] S201-3, when the current resistance value is less than or equal to the preset resistance threshold, the control unit controls the first contact and the fifth contact to disconnect, controls the first contact and the fourth contact to connect to make the aluminum-plastic film double cutter circuit conductive, controls the sixth contact and the second contact to connect to make the aluminum-plastic film capacitor discharge circuit conductive and controls the sixth contact and the second contact to disconnect after a first preset time.

[0081] S201-4, the control unit controls the seventh contact and the third contact to be connected so that the shell-positive voltage loop is turned on, obtains the shell-positive voltage collected by the voltage detection device, and controls the seventh contact and the third contact to be disconnected.

[0082] S201-5, the control unit controls the seventh contact to be connected to the second contact to make the shell-negative electrode voltage circuit conductive, obtains the shell-negative voltage collected by the voltage detection device, and controls the seventh contact to be disconnected from the second contact.

[0083] S201-6, the control unit controls the fifth contact to be connected to the second contact to make the shell-negative electrode resistance loop conductive, obtains the shell-negative resistance collected by the voltage detection device, and controls the fifth contact to be disconnected from the second contact.

[0084] S201-7, the control unit controls the fifth contact and the third contact to connect so that the shell-positive resistance loop is turned on, obtains the shell-positive resistance collected by the voltage detection device, controls the fifth contact and the third contact to disconnect, and controls the first contact and the fourth contact to disconnect.

[0085] It should be noted that the lithium battery testing method provided in this embodiment can perform the functions shown in the above system embodiment to achieve the corresponding technical effects. For the sake of brief description, for parts not mentioned in this embodiment, please refer to the corresponding contents in the above embodiments.

[0086] The control unit 20 provided in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the lithium battery testing method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0087] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0088] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A lithium battery testing system, characterized in that: The test system comprises: a control unit and a detection circuit, wherein the detection circuit comprises a first resistor, a resistance detection device, a voltage detection device, a first contact device, a second contact device, a first cutter and a second cutter; When testing the battery, the first cutter cuts into the aluminum-plastic film near the negative electrode of the battery, and the first contact device is connected to the negative electrode of the battery; the second cutter cuts into the aluminum-plastic film near the positive electrode of the battery, and the second contact device is connected to the positive electrode of the battery; A first contact is led out from the first cutter, a second contact is led out from the first contact device, a third contact is led out from the second contact device, and a fourth contact is led out from the second cutter; One end of the resistance detection device, the first resistor and the voltage detection device is connected to the second cutter, and a fifth contact, a sixth contact and a seventh contact are respectively led out from the other ends of the resistance detection device, the first resistor and the voltage detection device; The control unit is used to control the switching of the connection relationship among the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test.

2. The lithium battery testing system according to claim 1, characterized in that: The control unit is connected to the resistance detection device; The control unit is used to control the connection between the first contact and the fifth contact so that the double cutter self-checking circuit is turned on; The control unit is used to obtain a current resistance value of the resistance detection device, and when the current resistance value is greater than a preset resistance threshold, determine that the battery is a NG product.

3. The lithium battery testing system as claimed in claim 2, characterized in that: The first resistor and the voltage detection device are both connected to the control unit; When the current resistance value is less than or equal to a preset resistance threshold, the control unit is further used to control the first contact and the fifth contact to be disconnected, control the first contact and the fourth contact to be connected so that the aluminum-plastic film double cutter circuit is turned on, control the sixth contact and the second contact to be connected so that the aluminum-plastic film capacitor discharge circuit is turned on, and after a first preset time, control the sixth contact and the second contact to be disconnected; The control unit is also used to control the seventh contact to be connected to the third contact so that the shell-positive voltage loop is turned on, obtain the shell-positive voltage collected by the voltage detection device, and control the seventh contact to be disconnected from the third contact; The control unit is also used to control the seventh contact to be connected to the second contact so that the shell-negative voltage loop is turned on, obtain the shell-negative voltage collected by the voltage detection device, and control the seventh contact to be disconnected from the second contact; The control unit is also used to control the connection between the fifth contact and the second contact to make the shell-negative electrode resistance loop conductive, obtain the shell-negative resistance collected by the voltage detection device, and control the fifth contact and the second contact to disconnect; The control unit is also used to control the connection between the fifth contact and the third contact to make the shell-positive resistance loop conductive, obtain the shell-positive resistance collected by the voltage detection device, control the fifth contact and the third contact to disconnect, and control the first contact and the fourth contact to disconnect.

4. The lithium battery testing system according to claim 1, characterized in that: After the lithium battery test is completed, the control unit is further used to control the first contact device, the second contact device, the first cutter and the second cutter to detach from the battery cell.

5. The lithium battery testing system as claimed in claim 1, characterized in that: The testing system also includes a driving structure, on which the first cutter and the second cutter are mounted, and the driving structure is used to displace the first cutter and the second cutter so as to cut the first cutter and the second cutter into the aluminum-plastic film of the battery or drive the first cutter and the second cutter to detach from the battery.

6. The lithium battery testing system as claimed in claim 5, characterized in that: The driving structure includes a first mounting block, a first lifting cylinder, a first telescopic cylinder, a first position-limiting unit, a second mounting block, a second lifting cylinder, a second telescopic cylinder and a second position-limiting unit; The first cutter is mounted on the first mounting block, the first lifting cylinder is used to drive the first mounting block to approach or move away from the conveying structure for transporting the battery, the first telescopic cylinder is used to drive the first mounting block to approach or move away from the second mounting block, and the first limiting unit is used to limit the moving distance of the first mounting block driven by the first telescopic cylinder; The second cutter is installed on the second mounting block, the second lifting cylinder is used to drive the second mounting block to approach or move away from the conveying structure for transporting the battery, the second telescopic cylinder is used to drive the second mounting block to approach or move away from the first mounting block, and the second limiting unit is used to limit the moving distance of the second mounting block driven by the second telescopic cylinder.

7. The lithium battery testing system as claimed in claim 6, characterized in that: The test system further comprises a transfer module, and the transfer module is used to transfer the battery on the conveying structure to a space corresponding to the trigger instruction under the condition of receiving the trigger instruction.

8. A lithium battery testing method, characterized in that: Applied to the test system according to any one of claims 1 to 7, the method comprising: The control unit controls the switching of the connection relationship among the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact and the seventh contact to complete the lithium battery test.

9. The lithium battery testing method according to claim 8, characterized in that: The control unit controls the switching of the connection relationship of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact, and the seventh contact to complete the lithium battery test, including: The control unit controls the first contact and the fifth contact to connect so that the double cutter self-checking circuit is turned on; The control unit obtains a current resistance value of the resistance detection device, and determines that the battery is a NG product when the current resistance value is greater than a preset resistance threshold.

10. The lithium battery testing method according to claim 9, characterized in that: The control unit controls the switching of the connection relationship of the first contact, the second contact, the third contact, the fourth contact, the fifth contact, the sixth contact, and the seventh contact to complete the lithium battery test, and further includes: When the current resistance value is less than or equal to a preset resistance threshold, the control unit controls the first contact and the fifth contact to be disconnected, controls the first contact and the fourth contact to be connected, so that the aluminum-plastic film double cutter circuit is turned on, controls the sixth contact and the second contact to be connected, so that the aluminum-plastic film capacitor discharge circuit is turned on, and after a first preset time, controls the sixth contact and the second contact to be disconnected; The control unit controls the seventh contact to be connected to the third contact so that the shell-positive electrode voltage loop is turned on, obtains the shell-positive voltage collected by the voltage detection device, and controls the seventh contact to be disconnected from the third contact; The control unit controls the seventh contact to be connected with the second contact so as to conduct the shell-negative electrode voltage loop, obtains the shell-negative electrode voltage collected by the voltage detection device, and controls the seventh contact to be disconnected with the second contact; The control unit controls the fifth contact to be connected with the second contact so as to conduct the shell-negative electrode resistance loop, obtains the shell-negative electrode resistance collected by the voltage detection device, and controls the fifth contact to be disconnected with the second contact; The control unit controls the connection between the fifth contact and the third contact to make the shell-positive resistance loop conductive, obtains the shell-positive resistance collected by the voltage detection device, controls the fifth contact and the third contact to be disconnected, and controls the first contact and the fourth contact to be disconnected.

Images