A charging and discharging device and a battery production line

Abstract

The application relates to the technical field of battery manufacturing, and provides a charging and discharging equipment and a battery production line, which can solve the technical problem that false measurement is prone to occur when a battery monomer is subjected to side voltage detection. The charging and discharging equipment comprises a cabinet body, a charging and discharging module, a first voltage detection module and a second voltage detection module. The cabinet body is provided with a containing space for containing a battery monomer, and the battery monomer comprises a shell. The charging and discharging module is arranged on the cabinet body and is electrically connected with the battery monomer, and is used for charging and discharging test of the battery monomer. The first voltage detection module is arranged on the cabinet body and is electrically connected with the battery monomer, and is used for detecting the voltage of the battery monomer during the charging and discharging test. The second voltage detection module is arranged on the cabinet body and is electrically connected with the first voltage detection module, the second voltage detection module is connected with the shell, and is used for detecting the voltage of the shell during the charging and discharging test of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a charging and discharging device and a battery production line. Background Technology

[0002] Currently, in related technologies, the edge voltage of the battery cell is generally detected by edge voltage measuring equipment during the OCV (Open Circuit Voltage) sorting stage or after capacity grading, which is an offline measurement.

[0003] However, due to the short measurement time of the side voltage measuring device during offline measurement, it is impossible to monitor the changes in side voltage, which makes it impossible to effectively identify short circuits inside the cell and easily leads to false measurements. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a charging and discharging device and a battery production line that detects the side voltage during the charging and discharging process of a single battery cell. This allows for comprehensive monitoring of side voltage changes, effective identification of short circuits within the battery cell, improved short circuit detection rate, and avoidance of false detections.

[0005] In a first aspect, this application provides a charging and discharging device, comprising: a cabinet having a accommodating space for accommodating a battery cell, the battery cell including a casing; a charging and discharging module disposed in the cabinet and electrically connected to the battery cell for performing charging and discharging tests on the battery cell; a first voltage detection module disposed in the cabinet and electrically connected to the battery cell for detecting the voltage of the battery cell during the charging and discharging test; and a second voltage detection module disposed in the cabinet and electrically connected to the first voltage detection module, the second voltage detection module being connected to the casing for detecting the voltage of the casing during the charging and discharging test of the battery cell.

[0006] In this application, the second voltage detection module is connected to the casing of the battery cell and is electrically connected to the first voltage detection module. This allows for the detection of the casing voltage (side voltage) of the battery cell during charge-discharge testing. It is understood that since the formation or capacity grading (charge-discharge) process of a battery cell takes a relatively long time, detecting the side voltage of the battery cell through the second voltage detection module during this process can effectively increase the detection time. This allows for prolonged side voltage detection of the battery cell without affecting its normal charge-discharge operation, fully monitoring the side voltage changes, accurately identifying the side voltage change curve, and thus effectively identifying internal short circuits within the battery cell, improving the short circuit detection rate, and avoiding false detections.

[0007] Furthermore, by integrating the measuring device (second voltage detection module) used to measure the side voltage of a battery cell into the charging and discharging equipment used for formation or capacity grading, the short-circuit detection rate of battery cells is improved, while the functionality of the charging and discharging equipment is expanded, the processes in the battery cell manufacturing process are simplified, and the production cycle of batteries is improved.

[0008] In addition, during the formation or capacity testing of battery cells, the battery cells are pressurized. Through long-term pressure measurement and monitoring, the pressure state of the battery cells during actual use can be guaranteed.

[0009] In some implementations, the second voltage detection module includes a first voltage sampling device, which is located in the cabinet and connected to the housing, and is used to collect the voltage of the housing when the battery cell is being charged and discharged.

[0010] In some implementations, there are multiple first voltage sampling elements, which are used to connect to the housings of multiple battery cells respectively.

[0011] In some implementations, the cabinet includes at least two shelves, which are spaced apart along a first direction to form an accommodating space, and a first voltage sampling device is disposed on one of the shelves and is at least partially located within the accommodating space.

[0012] In some implementations, the charging and discharging equipment further includes a temperature detection element for detecting the temperature of a single battery cell during charging and discharging testing; wherein at least one layer plate is provided with a mounting portion, and at least one of the temperature detection element and the first voltage sampling element is located in the mounting portion.

[0013] In some implementations, the first voltage detection module includes a first voltage monitor and a second voltage sampling device. The second voltage sampling device is connected to the first voltage monitor and electrically connected to a battery cell, and is used to collect the voltage of the battery cell during charge and discharge testing. The first voltage sampling device is connected to the first voltage monitor. Alternatively, the second voltage detection module may further include a second voltage monitor, which is electrically connected to the first voltage monitor or the second voltage sampling device, and the first voltage sampling device is connected to the second voltage monitor.

[0014] In some implementations, there are two second voltage sampling devices, one of which is electrically connected to the positive terminal of the battery cell, and the other is electrically connected to the negative terminal of the battery cell; wherein, when the second voltage detection module also includes a second voltage monitor, the second voltage monitor is electrically connected to at least one of the two second voltage sampling devices.

[0015] In some implementations, when the second voltage monitor is electrically connected to both second voltage sampling devices, the second voltage monitor forms a first circuit with one of the second voltage sampling devices, and the second voltage monitor forms a second circuit with the other second voltage sampling device. The second voltage detection module also includes a control valve, which is located in both the first and second circuits. The control valve includes a first operating position and a second operating position. When the control valve is in the first operating position, the first circuit is on and the second circuit is off; when the control valve is in the second operating position, the first circuit is off and the second circuit is on.

[0016] In some implementations, the charging and discharging device also includes a restraint structure, at least a portion of which is disposed in the accommodating space for fixing the battery cells.

[0017] Secondly, this application provides a battery production line, which includes the charging and discharging equipment as described in the first aspect.

[0018] In the battery production line of this application, since the charging and discharging equipment of the first aspect is included, the same beneficial effects can be achieved. That is, by detecting the side voltage during the charging and discharging process of a battery cell, the changes in the side voltage can be fully monitored, short circuits inside the battery cell can be effectively identified, the short circuit detection rate can be improved, and false detections can be avoided. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the partial structural schematic diagrams of the charging and discharging device according to an embodiment of this application; Figure 2 This is a second partial structural schematic diagram of the charging and discharging device according to an embodiment of this application; Figure 3 This is the third partial structural schematic diagram of the charging and discharging device according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the charging and discharging device according to an embodiment of this application; Figure 5 This is a schematic block diagram of a battery production line according to an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures: 1-Charging and discharging equipment; 11-Cabinet; 112-Accommodation space; 114-Shelf; 116-Mounting part; 12-Charging and discharging module; 122-Positive current probe; 124-Negative current probe; 13-First voltage detection module; 132-First voltage monitor; 134-Second voltage sampling device; 14-Second voltage detection module; 141-First voltage sampling device; 142-Second voltage monitor; 143-First circuit; 144-Second circuit; 145-Control valve; 15-Temperature detection device; 16-Constraint structure; 2-Battery production line; 3-Battery cell; 32-Housing shell; 34-Positive terminal; 36-Negative terminal; X-First direction. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0029] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this 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, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0032] Currently, in the battery manufacturing process, the relevant technology generally involves detecting the edge voltage of individual battery cells using edge voltage measurement equipment during the OCV sorting stage or after capacity grading, either with or without applied pressure—this is known as offline measurement. However, offline edge voltage measurement is relatively short, typically 1 to 2 seconds, making it difficult to effectively monitor changes in edge voltage. This can lead to an inability to effectively identify short circuits within individual battery cells and is prone to false readings.

[0033] To address the aforementioned technical problem of erroneous measurements during edge voltage detection of individual battery cells, embodiments of this application provide a charging / discharging device 1 and a battery production line 2.

[0034] The charging and discharging device 1 of this application embodiment can be applied in the battery production line 2. It can not only perform charging and discharging tests on battery cells 3, but also detect the side voltage during the charging and discharging test of battery cells 3. It can fully monitor the changes in side voltage, effectively identify short circuits inside battery cells 3, improve the short circuit detection rate, and avoid false tests.

[0035] Below, in conjunction with Figures 1 to 5 This application will be described in detail.

[0036] Reference Figure 1 , Figure 2 and Figure 4 , Figure 1 This is one of the partial structural schematic diagrams of the charging and discharging device 1 according to an embodiment of this application; Figure 2 This is a second partial structural schematic diagram of the charging and discharging device 1 according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the charging and discharging device 1 according to an embodiment of this application. The charging and discharging device 1 according to this embodiment includes: a cabinet 11, the cabinet 11 having a accommodating space 112 for accommodating a battery cell 3, the battery cell 3 including a housing 32; a charging and discharging module 12, disposed in the cabinet 11 and electrically connected to the battery cell 3, for performing charging and discharging tests on the battery cell 3; a first voltage detection module 13, disposed in the cabinet 11 and electrically connected to the battery cell 3, for detecting the voltage of the battery cell 3 during the charging and discharging test; and a second voltage detection module 14, disposed in the cabinet 11 and electrically connected to the first voltage detection module 13, the second voltage detection module 14 being connected to the housing 32, for detecting the voltage of the housing 32 during the charging and discharging test of the battery cell 3.

[0037] The charging and discharging device 1 proposed in this application includes a cabinet 11, a charging and discharging module 12, a first voltage detection module 13, and a second voltage detection module 14.

[0038] The cabinet 11 is provided with a accommodating space 112 for accommodating the battery cell 3. Since the charge / discharge module 12 is electrically connected to the battery cell 3, charge / discharge tests can be performed on the battery cell 3. Optionally, the charge / discharge test can be performed during the formation process or the capacity testing process.

[0039] In the battery manufacturing process, formation and capacity grading are crucial steps. Formation is the process of activating the positive and negative electrode materials inside the battery cell 3 through a specific charge and discharge cycle after the battery cell 3 is manufactured, thereby improving the overall performance of the battery cell 3. Capacity grading, on the other hand, is a production process that involves charging and discharging the battery cell 3 after formation, measuring various parameters of the battery cell 3, and then assembling the battery cells 3 according to the measured parameters.

[0040] In one alternative embodiment, the charge / discharge device 1 includes a formation device or a capacity grading device. The first voltage detection module 13 is electrically connected to the battery cell 3. That is, during the charge / discharge test of the battery cell 3, the first voltage detection module 13 can detect the voltage of the battery cell 3 to monitor its voltage changes. The voltage of the battery cell 3 is the voltage between the positive terminal 34 and the negative terminal 36.

[0041] The second voltage detection module 14 is connected to the casing 32 of the battery cell 3, and is electrically connected to the first voltage detection module 13. This allows for the detection of the casing 32 voltage (side voltage) of the battery cell 3 during charge / discharge testing. It is understood that since the formation or capacity grading (charge / discharge) process of the battery cell 3 takes a relatively long time, detecting the side voltage of the battery cell 3 through the second voltage detection module 14 during this process can effectively increase the side voltage detection time. This allows for prolonged side voltage detection of the battery cell 3 without affecting its normal charge / discharge, fully monitoring the side voltage changes, accurately identifying the side voltage change curve, and effectively identifying internal short circuits in the battery cell 3, improving the short circuit detection rate and avoiding false tests.

[0042] Furthermore, by integrating the measuring device (second voltage detection module 14) used to measure the voltage of the three sides of the battery cell into the charging and discharging device 1 used for formation or capacity grading, the short circuit detection rate of the battery cell 3 is improved, the functionality of the charging and discharging device 1 is expanded, the process of manufacturing the battery cell 3 is simplified, and the production cycle of the battery is improved.

[0043] In addition, when forming or grading the battery cell 3, the battery cell 3 is pressurized. Through long-term pressure measurement and monitoring, the pressure state of the battery cell 3 during actual battery use can be met.

[0044] Reference Figure 2 In one alternative embodiment, the charge / discharge module 12 includes a positive current probe 122, a negative current probe 124, and a power supply device. The power supply device is electrically connected to the positive current probe 122 and the negative current probe 124, respectively. The positive current probe 122 is connected to the positive terminal 34 of the battery cell 3, and the negative current probe 124 is connected to the negative terminal 36 of the battery cell 3, thereby enabling charge / discharge testing of the battery cell 3.

[0045] Optionally, the positive current probe 122 may include a gate-type current probe.

[0046] Optionally, the negative current probe 124 may include a gate-type current probe.

[0047] Reference Figure 1 In some embodiments of this application, the second voltage detection module 14 includes a first voltage sampling element 141, which is disposed in the cabinet 11 and connected to the housing 32, and is used to collect the voltage of the housing 32 when the battery cell 3 is charged and discharged.

[0048] In this embodiment, the first voltage sampling element 141 is connected to the casing 32 of the battery cell 3, so that during the charging and discharging test of the battery cell 3, the voltage of the casing 32 of the battery cell 3 is collected by the first voltage sampling element 141, thereby realizing the detection of the side voltage of the battery cell 3.

[0049] Specifically, the side voltage is collected and detected during the charge and discharge test of battery cell 3. Due to the long test time, the side voltage change of battery cell 3 can be fully monitored, effectively identifying side voltage defects in battery cell 3 and improving the short circuit detection rate.

[0050] In an alternative embodiment, the first voltage sampling element 141 may include a first voltage probe.

[0051] In some embodiments of this application, there are multiple first voltage sampling elements 141, and the multiple first voltage sampling elements 141 are used to connect to the housings 32 of multiple battery cells 3 respectively.

[0052] In this embodiment, since multiple battery cells 3 are typically charged and discharged simultaneously during the battery manufacturing process, the accommodating space 112 can accommodate multiple battery cells 3 and can simultaneously perform formation or capacity testing on multiple battery cells 3.

[0053] Multiple first voltage sampling devices 141 respectively collect the voltage of the casing 32 of multiple battery cells 3, thereby enabling the simultaneous detection of the side voltage of multiple battery cells 3, which is beneficial to improving the side voltage detection efficiency. At the same time, the side voltage curves of different battery cells 3 can be compared, which is helpful to analyze the types of short circuit defects.

[0054] Reference Figure 4 In some embodiments of this application, the cabinet 11 includes at least two shelves 114, which are arranged at intervals along a first direction X to form at least one accommodating space 112. The first voltage sampling element 141 is disposed on one of the shelves 114 and is at least partially located within the accommodating space 112.

[0055] In this embodiment, since the accommodating space 112 is used to accommodate the battery cell 3, by setting the first voltage sampling element 141 on one of the layers 114, and at least a part of the first voltage sampling element 141 is located in the accommodating space 112, the first voltage sampling element 141 can be easily connected to the housing 32 of the battery cell 3, so as to collect the voltage of the housing 32 during the charging and discharging test of the battery cell 3, thereby realizing long-term measurement of the side voltage and avoiding false measurements.

[0056] In one alternative embodiment, the first direction X can be the height direction of the cabinet 11.

[0057] In one alternative embodiment, one of the layers 114 is provided with a mounting hole that communicates with the accommodating space 112, and a first voltage sampling element 141 is provided in the mounting hole.

[0058] Reference Figure 1 and Figure 4 In some embodiments of this application, the charging and discharging device 1 further includes a temperature detection element 15, which is used to detect the temperature of the battery cell 3 during charging and discharging tests; wherein, at least one layer plate 114 is provided with a mounting portion 116, and at least one of the temperature detection element 15 and the first voltage sampling element 141 is provided in the mounting portion 116.

[0059] In this embodiment, during the charge and discharge test of the battery cell 3, the temperature of the battery cell 3 is detected by the temperature detection device 15, thereby realizing the monitoring of the temperature of the battery cell 3.

[0060] Specifically, at least one of the temperature sensing element 15 and the first voltage sampling element 141 is disposed on the mounting portion 116. Optionally, the temperature sensing element 15 is disposed on the mounting portion 116. Alternatively, the first voltage sampling element 141 is disposed on the mounting portion 116. Alternatively, there are two mounting portions 116, with the temperature sensing element 15 and the first voltage sampling element 141 disposed on two separate mounting portions 116. The specific configuration can be adjusted according to actual needs.

[0061] Understandably, in related technologies, when monitoring the temperature of a battery cell 3, two temperature detection elements 15 are generally used. With the temperature detection element 15 and the first voltage sampling element 141 respectively located in two mounting portions 116, the first voltage sampling element 141 replaces one of the temperature detection elements 15. This allows for long-term detection of the side voltage without affecting the temperature detection of the battery cell 3. Furthermore, replacing one of the temperature detection elements 15 with the first voltage sampling element 141 simplifies the structure of the charging / discharging device 1.

[0062] In an alternative embodiment, the two mounting portions 116 are located on both sides of the accommodating space 112 in the first direction X, thereby enabling temperature and side voltage detection while avoiding interference with other structures.

[0063] In an alternative embodiment, the temperature sensing element 15 may include a temperature probe.

[0064] Reference Figure 1 In some embodiments of this application, the first voltage detection module 13 includes a first voltage monitor 132 and a second voltage sampling element 134. The second voltage sampling element 134 is connected to the first voltage monitor 132 and electrically connected to the battery cell 3, and is used to collect the voltage of the battery cell 3 during charge and discharge testing. The first voltage sampling element 141 is connected to the first voltage monitor 132. Alternatively, the second voltage detection module 14 may also include a second voltage monitor 142, which is electrically connected to the first voltage monitor 132 or the second voltage sampling element 134, and the first voltage sampling element 141 is connected to the second voltage monitor 142.

[0065] In this embodiment, the first voltage monitor 132 is connected to the second voltage sampling device 134, and the second voltage sampling device 134 is electrically connected to the battery cell 3, that is, the second voltage sampling device 134 is electrically connected to the positive terminal 34 and the negative terminal 36 of the battery cell 3, thereby realizing the monitoring of the voltage of the battery cell 3 during the charge and discharge test.

[0066] The first voltage sampling element 141 is connected to the first voltage monitor 132, that is, the first voltage sampling element 141 and the second voltage sampling element 134 share a voltage monitor, thereby realizing the monitoring of voltage during the charging and discharging test of battery cell 3, as well as side voltage measurement, while simplifying the structure of the charging and discharging equipment 1.

[0067] The second voltage detection module 14 also includes a second voltage monitor 142, wherein the first voltage sampling element 141 is connected to the second voltage monitor 142, that is, the first voltage sampling element 141 and the second voltage sampling element 134 are respectively connected to different voltage monitors, so that the side voltage can be measured for a long time without affecting the voltage monitoring during the original charge and discharge test.

[0068] In an alternative embodiment, the second voltage sampler 134 may be a second voltage probe.

[0069] In one alternative embodiment, the positive current probe 122 is located on the outer periphery of the second voltage probe, or the negative current probe 124 is located on the outer periphery of the second voltage probe, or there are two second voltage probes, with the positive current probe 122 located on the outer periphery of one of the second voltage probes and the negative current probe 124 located on the outer periphery of the other second voltage probe.

[0070] In an alternative embodiment, the first voltage monitor 132 may be a voltmeter.

[0071] In one alternative embodiment, the second voltage monitor 142 may be a voltmeter.

[0072] Reference Figure 1 and Figure 3 , Figure 3 This is a partial structural diagram of the charging and discharging device 1 according to an embodiment of this application. In some embodiments of this application, there are two second voltage sampling elements 134. One second voltage sampling element 134 is electrically connected to the positive terminal 34 of the battery cell 3, and the other second voltage sampling element 134 is electrically connected to the negative terminal 36 of the battery cell 3. In the case where the second voltage detection module 14 also includes a second voltage monitor 142, the second voltage monitor 142 is electrically connected to at least one of the two second voltage sampling elements 134.

[0073] In this embodiment, since the two second voltage sampling devices 134 are electrically connected to the positive terminal 34 and the negative terminal 36 respectively, the voltage of the positive terminal 34 and the negative terminal 36 is monitored during the charge and discharge test of the battery cell 3.

[0074] When the second voltage monitor 142 is electrically connected to the second voltage sampling element 134 connected to the positive terminal 34, the voltage between the positive terminal and the housing 32 can be measured in conjunction with the first voltage sampling element 141. When the second voltage monitor 142 is electrically connected to the second voltage sampling element 134 connected to the negative terminal 36, the voltage between the negative terminal and the housing 32 can be measured in conjunction with the first voltage sampling element 141.

[0075] Reference Figure 3In some embodiments of this application, when the second voltage monitor 142 is electrically connected to both second voltage sampling elements 134, the second voltage monitor 142 forms a first circuit 143 with one of the second voltage sampling elements 134, and the second voltage monitor 142 forms a second circuit 144 with the other second voltage sampling element 134. The second voltage detection module 14 further includes a control valve 145, which is disposed in the first circuit 143 and the second circuit 144. The control valve 145 includes a first working position and a second working position. When the control valve 145 is in the first working position, the first circuit 143 is turned on and the second circuit 144 is turned off; when the control valve 145 is in the second working position, the first circuit 143 is turned off and the second circuit 144 is turned on.

[0076] In this embodiment, when the second voltage monitor 142 is electrically connected to both second voltage sampling devices 134, the switching of the positive voltage to the housing 32 and the negative voltage to the housing 32 can be achieved by switching the operating position of the control valve 145.

[0077] Specifically, when the control valve 145 is in the first working position, the first circuit 143 formed by the second voltage monitor 142 and the second voltage sampling element 134 connected to the positive terminal 34 is turned on, and the second circuit 144 formed by the second voltage monitor 142 and the second voltage sampling element 134 connected to the negative terminal 36 is turned off, so that the voltage of the positive terminal to the housing 32 can be measured.

[0078] When the control valve 145 is in the second working position, the first circuit 143 formed by the second voltage monitor 142 and the second voltage sampling element 134 connected to the positive terminal 34 is disconnected, and the second circuit 144 formed by the second voltage monitor 142 and the second voltage sampling element 134 connected to the negative terminal 36 is connected, so that the voltage of the negative terminal to the housing 32 can be measured.

[0079] In an alternative embodiment, control valve 145 may include a solenoid valve.

[0080] Reference Figure 4 In some embodiments of this application, the charging and discharging device 1 further includes a restraint structure 16, at least a portion of which is disposed in the accommodating space 112 for fixing the battery cell 3.

[0081] In this embodiment, since the restraint structure 16 can fix the battery cell 3, that is, the measuring device (second voltage detection module 14) for measuring the side voltage of the battery cell 3 is integrated into the charging and discharging device 1 with the restraint structure 16. Due to the presence of restraint pressure, the actual use state of the battery cell 3 can be effectively simulated, which is beneficial to further improve the detection efficiency of the circuit.

[0082] In an alternative embodiment, the restraint structure 16 includes a restraint tray or a restraint fixture.

[0083] In one specific embodiment, during the constrained formation or capacity-controlled charging and discharging process, the cell (battery cell 3) is charged and discharged normally through voltage and current probes (second voltage sampling element 134 and positive current probe 122). The voltage probe (first voltage sampling element 141) and the positive and negative voltage probes (second voltage sampling element 134) are switched by a solenoid valve (control valve 145) to switch the voltage of the positive electrode to the casing 32 and the voltage of the negative electrode to the casing 32. The casing 32 voltage of the cell is measured and monitored without affecting the normal capacity-controlled charging and discharging of the cell.

[0084] The formation and capacity testing cabinet (charge and discharge device 1) proposed in this application can monitor both the voltage curve and the voltage of the casing 32. By identifying the side voltage change curve, it can effectively identify voltage changes and thus effectively identify actual side voltage defects (internal short circuits in the battery cell). Moreover, the side voltage test time is relatively long, which can effectively monitor side voltage changes and improve the short circuit detection rate.

[0085] In addition, comparing the side voltage curves of different cells (cell 3) can help analyze the types of short circuit defects.

[0086] In addition, when the device is integrated into the confinement formation or capacity testing equipment, that is, the device for measuring the side voltage is integrated into the charging and discharging equipment 1 with the confinement structure 16, the confinement pressure is large, which can effectively simulate the actual use state of the battery cell and improve the short circuit detection efficiency.

[0087] By adding a side voltage test within the capacity testing (charging / discharging device 1) and monitoring it through long-term pressure measurement, the short-circuit detection rate can be effectively improved. In other words, based on the original monitoring of the voltage and temperature of the positive and negative terminals 36 during charging and discharging, the measurement of the casing voltage (side voltage) is added, thereby monitoring changes in the side voltage and improving the short-circuit detection capability.

[0088] Reference Figure 5 , Figure 5 This is a schematic block diagram of a battery production line 2 according to an embodiment of this application. In some embodiments of this application, a battery production line 2 is proposed, including the charging and discharging equipment 1 as described in any of the foregoing embodiments.

[0089] In this embodiment, a charging and discharging device 1 including any of the above embodiments is defined. Therefore, the battery production line 2 has the advantages of the charging and discharging device 1 in any of the above embodiments and can achieve the technical effects that the charging and discharging device 1 in any of the above embodiments can achieve. To avoid repetition, it will not be described again here.

[0090] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging and discharging device (1), characterized in that, include: The cabinet (11) has a accommodating space (112) for accommodating a battery cell (3), the battery cell (3) including a housing (32). A charging and discharging module (12) is located in the cabinet (11) and electrically connected to the battery cell (3) for charging and discharging tests on the battery cell (3); The first voltage detection module (13) is located in the cabinet (11) and electrically connected to the battery cell (3) for detecting the voltage of the battery cell (3) during charging and discharging tests. The second voltage detection module (14) is located in the cabinet (11) and is electrically connected to the first voltage detection module (13). The second voltage detection module (14) is connected to the housing (32) and is used to detect the voltage of the housing (32) when the battery cell (3) is charged and discharged.

2. The charging and discharging device (1) as described in claim 1, characterized in that, The second voltage detection module (14) includes: A first voltage sampling device (141) is disposed in the cabinet (11) and connected to the housing (32) for collecting the voltage of the housing (32) when the battery cell (3) is charged and discharged.

3. The charging and discharging device (1) as described in claim 2, characterized in that, The number of the first voltage sampling elements (141) is multiple, and the multiple first voltage sampling elements (141) are used to connect to the housing (32) of the multiple battery cells (3) respectively.

4. The charging and discharging device (1) as described in claim 2, characterized in that, The cabinet (11) includes at least two shelves (114) arranged at intervals along a first direction (X) to form at least one of the accommodating spaces (112), and the first voltage sampling element (141) is disposed on one of the shelves (114) and is at least partially located within the accommodating space (112).

5. The charging and discharging device (1) as described in claim 4, characterized in that, The charging and discharging device (1) further includes: Temperature detection element (15) is used to detect the temperature of the battery cell (3) during charge and discharge testing; At least one of the layers (114) is provided with a mounting portion (116), and at least one of the temperature detection element (15) and the first voltage sampling element (141) is provided in the mounting portion (116).

6. The charging and discharging device (1) as described in claim 2, characterized in that, The first voltage detection module (13) includes: First voltage monitor (132); The second voltage sampling device (134) is connected to the first voltage monitor (132) and electrically connected to the battery cell (3) for collecting the voltage of the battery cell (3) during charge and discharge testing; The first voltage sampling device (141) is connected to the first voltage monitor (132); or the second voltage detection module (14) further includes a second voltage monitor (142), which is electrically connected to the first voltage monitor (132) or the second voltage sampling device (134), and the first voltage sampling device (141) is connected to the second voltage monitor (142).

7. The charging and discharging device (1) as described in claim 6, characterized in that, There are two second voltage sampling devices (134), one of which is electrically connected to the positive terminal (34) of the battery cell (3), and the other is electrically connected to the negative terminal (36) of the battery cell (3). In the case where the second voltage detection module (14) further includes a second voltage monitor (142), the second voltage monitor (142) is electrically connected to at least one of the two second voltage sampling devices (134).

8. The charging and discharging device (1) as described in claim 7, characterized in that, With the second voltage monitor (142) electrically connected to both second voltage sampling elements (134), the second voltage monitor (142) forms a first circuit (143) with one of the second voltage sampling elements (134), and the second voltage monitor (142) forms a second circuit (144) with the other second voltage sampling element (134). The second voltage detection module (14) further includes: A control valve (145) is provided in the first circuit (143) and the second circuit (144), and the control valve (145) includes a first working position and a second working position; Wherein, when the control valve (145) is in the first working position, the first circuit (143) is turned on and the second circuit (144) is turned off; when the control valve (145) is in the second working position, the first circuit (143) is turned off and the second circuit (144) is turned on.

9. The charging and discharging device (1) as described in any one of claims 1 to 8, characterized in that, The charging and discharging device (1) further includes: A restraint structure (16), at least a portion of which is disposed in the accommodating space (112), is used to fix the battery cell (3).

10. A battery production line (2), characterized in that, Includes the charging and discharging device (1) as described in any one of claims 1 to 9.

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