A charging and discharging device

Abstract

The application provides a charging and discharging device, and relates to the technical field of charging and discharging of an electric core. The charging and discharging device comprises a power supply and two output interface devices. The output interface device comprises a conductive column, a first suction cup and a contact. The conductive column is electrically connected with the power supply and the contact. The first suction cup is sleeved on the conductive column. The contacts of the two output interface devices are respectively used for contacting the positive electrode and the negative electrode of the electric core. The charging and discharging device can facilitate charging and discharging of the electric core.

Description

Technical Field

[0001] This application relates to the field of battery cell charging and discharging technology, and more specifically, to a charging and discharging device. Background Technology

[0002] Battery modules are typically composed of multiple cells connected in series or in parallel. In practical applications, due to differences in manufacturing processes, changes in the usage environment, and aging, the cells inevitably experience pressure difference issues throughout their entire lifespan.

[0003] Existing methods for reducing the voltage difference of battery cell modules typically require technicians to use handheld specialized charging and discharging equipment to connect the positive and negative terminals of each cell individually for voltage detection and charging / discharging. This method is relatively inefficient, especially in large battery modules or complex installation environments where the limitations of manual operation are more pronounced. Summary of the Invention

[0004] The purpose of this application includes, for example, providing a charging and discharging device that facilitates the charging and discharging of battery cells.

[0005] The embodiments of this application can be implemented as follows: An embodiment of this application provides a charging and discharging device, which includes a power supply and two output interface devices. Each output interface device includes a conductive post, a first suction cup, and a contact. The conductive post is electrically connected to both the power supply and the contact. The first suction cup is sleeved on the conductive post. The contacts of the two output interface devices are respectively used to contact the positive and negative terminals of the battery cell.

[0006] Optionally, the conductive post includes a threaded portion and a mounting portion connected together, wherein the diameter of the threaded portion is smaller than the diameter of the mounting portion; The output interface device further includes a nut, which engages with the threaded portion to press the first suction cup against the mounting portion.

[0007] Optionally, the conductive post has a through hole along its length, and a valve stem slides through the through hole with a clearance fit between the valve stem and the through hole; one end of the valve stem is provided with a cap, and the other end of the valve stem is provided with a flange; an elastic element is provided between the cap and the conductive post, wherein the diameter of the flange is larger than the diameter of the valve stem.

[0008] Optionally, the conductive post has a groove on the side facing the contact, and a sealing ring is provided in the groove. The flange can be pressed against the sealing ring under the action of the elastic member.

[0009] Optionally, the output interface device further includes a first spring contact, which is connected between the conductive post and the contact.

[0010] Optionally, the output interface device further includes a second spring and a plurality of second suction cups, the plurality of second suction cups being arranged around the first suction cup, the second spring being connected to the plurality of second suction cups simultaneously, and the second spring being sleeved on the conductive post.

[0011] Optionally, the second spring is provided with a plurality of first mating parts, and the second suction cup is provided with a second mating part, wherein the plurality of first mating parts are threadedly engaged with the plurality of second mating parts respectively.

[0012] Optionally, the charging and discharging device includes a controller, which is electrically connected to the power supply and the conductive posts of the two output interface devices. The controller is equipped with a polarity identification circuit, which includes a first circuit and a second circuit. The controller can identify the positive and negative terminals of the battery cell when the contacts of the two output interface devices are in contact with the positive and negative terminals of the battery cell, respectively, and control the first circuit or the second circuit to be turned on.

[0013] Optionally, the charging and discharging device further includes a display device, which is electrically connected to the controller.

[0014] Optionally, the charging and discharging device is provided with a communication interface and an AC input interface. The communication interface is used to connect to a host computer, and the AC input interface is used to connect to the power supply.

[0015] The beneficial effects of the charging and discharging device provided in this application include, for example, when charging a battery cell, the operator only needs to align the contacts of the two output interface devices with the positive and negative terminals of the target battery cell, respectively, and gently press to make the first suction cup adhere to the end face of the battery cell, thus fixing the output interface devices to the battery cell. In this state, the contacts maintain reliable contact with the battery cell terminals, and the current is transmitted to the contacts through the conductive posts, thereby completing the charging or discharging operation of the battery cell. Since the first suction cup provides stable adhesion, the entire process does not require manual hand operation, significantly improving the convenience of operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the charging and discharging device in an embodiment of this application; Figure 2 This is a schematic diagram of the output interface device in an embodiment of this application; Figure 3 This is a cross-sectional view of the output interface device in an embodiment of this application; Figure 4 This is a schematic diagram of the polarity identification circuit in the controller in an embodiment of this application; Figure 5 This is a schematic diagram illustrating the first installation condition of the output interface device in the embodiments of this application; Figure 6 This is a schematic diagram illustrating a second installation condition of the output interface device in an embodiment of this application.

[0018] Icons: 10-Charging / discharging device; 100-Output interface device; 110-Conductive post; 111-Threaded part; 112-Mounting part; 1121-Groove; 1122-Sealing ring; 113-Through hole; 114-Valve stem; 1141-Flange; 115-Press cap; 116-Elastic element; 120-First suction cup; 130-Contact; 140-Nut; 150-First spring; 160-Second spring; 161-First mating part; 170-Second suction cup; 171-Second mating part; 200-Controller; 300-Display device; 400-Communication interface; 500-AC input interface; 600-Battery cell. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0025] During the maintenance and production of battery cells, voltage deviations often occur between individual cells due to factors such as long-term storage or temperature differences after assembly, which in turn affect the overall performance and lifespan of the module. Embodiments of this application propose a charging and discharging device that eliminates the need for manual handling, offers convenient connection, and provides enhanced safety.

[0026] Please refer to Figures 1-3 The embodiments of this application provide a charging and discharging device 10, including a power supply and two output interface devices 100. Each output interface device 100 includes a conductive post 110, a first suction cup 120, and a contact 130. The conductive post 110 is electrically connected to both the power supply and the contact 130. The first suction cup 120 is sleeved on the conductive post 110. The contacts 130 of the two output interface devices 100 are respectively used to contact the positive and negative terminals of the battery cell 600.

[0027] The conductive post 110 serves as the core component for electrical connection, maintaining electrical connection with both the power supply (optionally a DC charging / discharging power supply) and the contact 130, thereby forming a conductive path from the power supply to the battery cell 600. The first suction cup 120 is sleeved on the outer periphery of the conductive post 110, and its function is to firmly fix the entire output interface device 100 to the surface of the battery cell 600 by negative pressure adsorption when the contact 130 is aligned with the positive or negative terminal of the battery cell 600.

[0028] In practical applications, operators only need to align the contacts 130 of the two output interface devices 100 with the positive and negative terminals of the target battery cell 600, respectively, and gently press to make the first suction cup 120 adhere to the end face of the battery cell 600. At this time, some air is expelled from the first suction cup 120 to form a local negative pressure space, thus achieving mechanical fixation between the device and the battery cell 600. In this state, the contacts 130 maintain reliable contact with the terminals of the battery cell 600, and the current is transmitted to the contacts 130 through the conductive post 110, thereby completing the charging or discharging operation of the battery cell 600. Since the first suction cup 120 provides stable adhesion, the entire process does not require manual hand operation, significantly improving operational convenience and safety.

[0029] In this embodiment, the conductive post 110 includes a threaded portion 111 and a mounting portion 112 connected to each other. The diameter of the threaded portion 111 is smaller than the diameter of the mounting portion 112. The output interface device 100 also includes a nut 140, which cooperates with the threaded portion 111 to press the first suction cup 120 against the mounting portion 112.

[0030] The mounting portion 112 of the conductive post 110 has a larger diameter to support the first suction cup 120, while the threaded portion 111 has a smaller diameter to engage with the nut 140. During assembly, after the first suction cup 120 is fitted onto the conductive post 110 and placed on the end face of the mounting portion 112, the nut 140 is tightened onto the threaded portion 111, thus axially pressing the first suction cup 120 between the nut 140 and the mounting portion 112 to prevent it from loosening or falling off. It can be understood that this embodiment achieves reliable fixation of the first suction cup 120 through the mating structure of the conductive post 110 and the nut 140.

[0031] In this embodiment, the conductive post 110 has a through hole 113 along its length, and a valve stem 114 slides through the through hole 113 with clearance fit between the valve stem 114 and the through hole 113. One end of the valve stem 114 is provided with a cap 115, and the other end of the valve stem 114 is provided with a flange 1141. An elastic element 116 is provided between the cap 115 and the conductive post 110, wherein the diameter of the flange 1141 is larger than the diameter of the valve stem 114.

[0032] The conductive post 110 has a through hole 113 along its length, which passes through the threaded portion 111 and the mounting portion 112. The valve stem 114 slides through the through hole 113 and maintains a clearance fit with the through hole 113 to ensure that gas can enter between the valve stem 114 and the inner wall of the through hole 113. One end of the valve stem 114 is provided with a push cap 115, and the other end is provided with a flange 1141 with a diameter larger than the body of the valve stem 114. The flange 1141 is located on one side of the mounting portion 112. An elastic element 116 (optional spring) is also provided between the push cap 115 and the threaded portion 111 of the conductive post 110 to provide elastic force for the push cap 115 to return to its original position.

[0033] When the first suction cup 120 adheres to the end face of the battery cell 600, creating a negative pressure for fixation, disassembly can be achieved by manually pressing down the cap 115, causing the valve stem 114 to slide inward. This allows the flange 1141 to overcome the sealing state and extend beyond the mounting portion 112, enabling external air to enter the first suction cup 120, disrupting the negative pressure environment and thus releasing the adhesion. After releasing the pressure, the elastic element 116 pushes the cap 115 to automatically reset, and the valve stem 114 retracts to its initial position, ready for the next use.

[0034] In this embodiment, the conductive post 110 has a groove 1121 on the side facing the contact 130, and a sealing ring 1122 is provided in the groove 1121. The flange 1141 can be pressed against the sealing ring 1122 under the action of the elastic member 116.

[0035] The conductive post 110 has a groove 1121 on the side facing the contact 130, i.e., the side of the mounting part 112 away from the threaded part 111. A sealing ring 1122 is provided in the groove 1121. When the valve stem 114 is reset under the action of the elastic member 116, the flange 1141 at its end can be embedded in the groove 1121 and pressed against the sealing ring 1122, thereby sealing the air passage between the through hole 113 and the outside and preventing air from entering the first suction cup 120.

[0036] The cooperation between the sealing ring 1122 and the flange 1141 achieves a dynamic sealing function: when the button cap 115 is pressed, the flange 1141 disengages from the sealing ring 1122 and extends out of the mounting part 112, allowing external gas to enter the first suction cup 120 to release the adsorption; after the button cap 115 is released, the elastic element 116 pushes the valve stem 114 back to its original position, and the flange 1141 re-presses the sealing ring 1122, restoring the sealing state.

[0037] In this embodiment, the output interface device 100 further includes a first spring 150, which is connected between the conductive post 110 and the contact 130.

[0038] The first spring 150 in the output interface device 100 is connected between the conductive post 110 and the contact 130. As part of the conductive path, it can not only conduct current, but also generate preload when the contact 130 contacts the electrode post of the battery cell 600 due to its elastic deformation capability.

[0039] When the output interface device 100 is pressed against the end face of the cell 600 so that the contact 130 contacts the pole, the first spring 150 can be elastically compressed under pressure to adapt to the poles of the cell 600 of different heights, ensuring that the contact 130 always maintains a stable electrical connection with the pole.

[0040] In this embodiment, the output interface device 100 further includes a second spring 160 and a plurality of second suction cups 170. The plurality of second suction cups 170 are arranged around the first suction cup 120. The second spring 160 is connected to the plurality of second suction cups 170 at the same time. The second spring 160 is sleeved on the conductive post 110.

[0041] Multiple second suction cups 170 are arranged circumferentially around the first suction cup 120 to form auxiliary suction points around the main suction area; the second spring piece 160 is sleeved on the conductive post 110 and pressed between the nut 140 and the mounting part 112, and the second spring piece 160 is connected to multiple second suction cups 170 at the same time, serving as a support and force transmission component, and evenly transmitting the force to each second suction cup 170 during the overall pressing process.

[0042] When the output interface device 100 is pressed against the end face of the battery cell 600, the second spring 160 uses its elastic deformation capability to make each of the second suction cups 170 simultaneously adhere to the peripheral surface of the battery cell 600, thereby forming multi-point synergistic adsorption and effectively preventing the device from tilting or falling off due to uneven local force. It can be understood that this embodiment further enhances the adsorption stability of the output interface device 100 on the surface of the battery cell 600 by adding multiple second suction cups 170 around the first suction cup 120.

[0043] In this embodiment, the second spring 160 is provided with a plurality of first mating parts 161, and the second suction cup 170 is provided with a second mating part 171. The plurality of first mating parts 161 are threadedly engaged with the plurality of second mating parts 171 respectively.

[0044] The second spring 160 is provided with a plurality of first mating parts 161, and the second suction cup 170 is provided with a second mating part 171. The two are connected by threaded engagement to achieve a detachable and stable mechanical connection. Each second suction cup 170 can be adjusted in axial position relative to the second spring 160 by screwing in or out, thereby adjusting the height of the second suction cup 170 to fit the corresponding adsorption plane.

[0045] When the output interface device 100 needs to be adapted to different battery cell 600 surfaces, the operator can independently adjust the installation height of each second suction cup 170 to ensure it fits the area around the battery cell 600, thereby improving the overall adsorption stability. Simultaneously, the threaded engagement of the second spring 160 and the second suction cup 170 enhances connection reliability and prevents the suction cups from detaching due to vibration.

[0046] In this embodiment, the charging and discharging device 10 includes a controller 200. The controller 200 is electrically connected to both the power supply and the conductive posts 110 of the two output interface devices 100. The controller 200 is equipped with a polarity identification circuit, which includes a first circuit and a second circuit. The controller 200 can identify the positive and negative terminals of the battery cell 600 when the contacts 130 of the two output interface devices 100 are in contact with the positive and negative terminals of the battery cell 600, respectively, and control the first circuit or the second circuit to be turned on.

[0047] The controller 200 is electrically connected to both the power supply and the conductive posts 110 of the two output interface devices 100, and is used to coordinate the control logic of the entire charging and discharging process. The controller 200 has a polarity identification circuit inside, which includes an independent first circuit and a second circuit, corresponding to the polarity connection states of the two types of battery cells 600, respectively.

[0048] When the contacts 130 of the two output interface devices 100 respectively contact the two terminals of the battery cell 600, regardless of which contact 130 contacts the positive terminal and which contacts the negative terminal, the polarity identification circuit can automatically determine the actual polarity distribution of the battery cell 600 through the conduction path in the detection circuit. Once the polarity direction is determined, the controller 200 controls the corresponding first or second circuit to conduct, so that the output current of the power supply flows to the battery cell 600 according to the correct polarity, ensuring the safe start of charging or discharging operation. This process does not require manual differentiation of positive and negative terminals, greatly improving the convenience and safety of operation.

[0049] like Figure 4 As shown, the polarity identification circuit includes diodes D1, D2, D3, and D4, fuses FU1 to FU6, intermediate relays KA1 and KA2, and DC contactors KM1 and KM2.

[0050] Taking two output interface devices 100 as the first output interface device 100 and the second output interface device 100 as examples, when the first output interface device 100 is connected to the positive terminal of the battery cell 600 and the second output interface device 100 is connected to the negative terminal of the battery cell 600, D1 and D2 conduct the first circuit, the KA1 coil is energized, the normally open auxiliary contact of KA1 closes, the KM1 coil is energized, the normally open auxiliary contact of KM1 closes, and the DC power supply output is used to charge and discharge the battery cell 600. At the same time, the normally closed auxiliary contacts of KA1 and KA2 are interlocked, so that the KA1 and KA2 coils cannot be energized at the same time, forming an interlock, which also plays an interlocking role for KM1 and KM2. In addition, each circuit is equipped with a fuse to provide short-circuit protection.

[0051] When the second output interface device 100 is connected to the positive terminal of the battery cell 600 and the first output interface device 100 is connected to the negative terminal of the battery cell 600, D3 and D4 conduct the second circuit, energizing the KA2 coil and closing its normally open auxiliary contact. This energizes the KM2 coil and closes its normally open auxiliary contact, allowing the DC power supply to charge and discharge the battery cell 600. Simultaneously, the normally closed auxiliary contacts of KA1 and KA2 are interlocked, preventing both coils from being energized simultaneously, thus creating an interlock. This also interlocks KM1 and KM2. Furthermore, each circuit is equipped with a fuse for short-circuit protection.

[0052] In this embodiment, the charging and discharging device 10 further includes a display device 300, which is electrically connected to the controller 200.

[0053] When the controller 200 collects the operating data after the two output interface devices 100 are connected to the battery cell 600, it can transmit the charging and discharging current, voltage, time and temperature of the battery cell 600 or module to the display device 300 in real time for display. The operator can intuitively understand the current working status through the display device 300 and can set the charging and discharging current, voltage, time and temperature of the battery cell 600 or module on the display device 300.

[0054] In this embodiment, the charging and discharging device 10 is provided with a communication interface 400 and an AC input interface 500. The communication interface 400 is used to connect to the host computer, and the AC input interface 500 is used to connect to the power supply.

[0055] The AC input interface 500 is used to connect to an external AC power source (such as AC 220V or AC 380V) and is electrically connected to the power source to provide the power required for operation; while the communication interface 400 is connected to the controller 200 and can be used to connect to a host computer to realize remote parameter setting and status monitoring.

[0056] When the AC input interface 500 is connected to the mains power, the power supply can start working, providing the DC power required for charging or discharging to the output interface device 100; at the same time, a communication connection is established with the host computer through the communication interface 400, and the operator can remotely set parameters such as charging and discharging current, voltage, time, and temperature, and read the voltage status of the battery cell 600 or module in real time.

[0057] In addition, the functions of controller 200 include, but are not limited to: setting a certain range of charging and discharging current, such as setting the current of the equalization module according to the actual module capacity; performing corresponding control according to the current, voltage, and time parameters set as required; acquiring the individual voltage of multiple battery cell modules; realizing short circuit, overcurrent, overvoltage, and overtemperature protection throughout the entire input and output control process; and realizing power conversion control, which is equivalent to a combination of a bidirectional inverter and a memory.

[0058] For cases where the end face area of ​​a single 600-cell battery is relatively small, such as Figure 5 As shown, first, power is supplied through the AC input interface 500. The contacts 130 of the two output interface devices 100 are aligned with the positive and negative terminals of the battery cell 600, respectively. The first suction cup 120 is then used to hold the end face of the battery cell 600, and the battery cell 600 terminals are in contact with the contacts 130. The voltage, current, time, and other parameters for charging and discharging the battery cell 600 are set through the display device 300. The controller 200 analyzes and processes the set parameters and connects the corresponding charging and discharging circuit through the automatic polarity identification control function. After manual start of charging and discharging, it can be automatically stopped or manually stopped. All functions on the display device 300 can be implemented by connecting to the host computer through the communication interface 400.

[0059] To address the issue of the large end face area of ​​the single battery cell 600, the AC input interface 500 is first connected for power supply. The contacts 130 of the two output interface devices 100 are aligned with the positive and negative terminals of the battery cell 600, respectively. The first suction cup 120 is used to hold the middle of the battery cell 600, and the battery cell 600 terminals are in contact with the contacts 130. To further improve stability, multiple second suction cups 170 are attached to the periphery of the battery cell 600.

[0060] For modules assembled from 600 battery cells after welding, such as Figure 6 As shown, firstly, power is supplied through the AC input interface 500. Then, the contacts 130 of the two output interface devices 100 are aligned with the positive and negative terminals of the battery cell 600, respectively. Since multiple battery cells 600 are connected by conductive busbars, the first suction cup 120 is used to hold the conductive busbars, and the conductive busbars contact the contacts 130. To further improve stability, multiple second suction cups 170 are attached to the periphery of the corresponding battery cell 600.

[0061] In summary, this application provides a charging and discharging device 10, including a power supply and two output interface devices 100. Each output interface device 100 includes a conductive post 110, a first suction cup 120, and a contact 130. The first suction cup 120 provides a stable adhesion, ensuring reliable contact between the contact 130 and the electrode of the battery cell 600. Current is transmitted to the contact 130 via the conductive post 110, thereby completing the charging or discharging operation of the battery cell 600. The entire process does not require manual hand operation, significantly improving operational convenience.

[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging and discharging device, characterized in that, The device includes a power supply and two output interface devices (100). Each output interface device (100) includes a conductive post (110), a first suction cup (120), and a contact (130). The conductive post (110) is electrically connected to both the power supply and the contact (130). The first suction cup (120) is fitted onto the conductive post (110). The contacts (130) of the two output interface devices (100) are respectively used to contact the positive and negative terminals of the battery cell (600).

2. The charging and discharging device according to claim 1, characterized in that, The conductive post (110) includes a threaded portion (111) and a mounting portion (112) connected to each other, wherein the diameter of the threaded portion (111) is smaller than the diameter of the mounting portion (112); The output interface device (100) further includes a nut (140), which engages with the threaded portion (111) to press the first suction cup (120) against the mounting portion (112).

3. The charging and discharging device according to claim 1, characterized in that, The conductive post (110) has a through hole (113) along its length. A valve stem (114) slides through the through hole (113) and is clearance-fitted with the through hole (113). One end of the valve stem (114) is provided with a push cap (115), and the other end of the valve stem (114) is provided with a flange (1141). An elastic element (116) is provided between the push cap (115) and the conductive post (110). The diameter of the flange (1141) is larger than the diameter of the valve stem (114).

4. The charging and discharging device according to claim 3, characterized in that, The conductive post (110) has a groove (1121) on the side facing the contact (130), and a sealing ring (1122) is provided in the groove (1121). The flange (1141) can be pressed against the sealing ring (1122) under the action of the elastic member (116).

5. The charging and discharging device according to claim 1, characterized in that, The output interface device (100) further includes a first spring (150) connected between the conductive post (110) and the contact (130).

6. The charging and discharging device according to claim 1, characterized in that, The output interface device (100) further includes a second spring (160) and a plurality of second suction cups (170), the plurality of second suction cups (170) being arranged around the first suction cup (120), the second spring (160) being connected to the plurality of second suction cups (170) simultaneously, and the second spring (160) being sleeved on the conductive post (110).

7. The charging and discharging device according to claim 6, characterized in that, The second spring (160) is provided with a plurality of first mating parts (161), and the second suction cup (170) is provided with a second mating part (171). The plurality of first mating parts (161) are threadedly engaged with the plurality of second mating parts (171).

8. The charging and discharging device according to claim 1, characterized in that, The charging and discharging device (10) includes a controller (200), which is electrically connected to the power supply and the conductive posts (110) of the two output interface devices (100). The controller (200) is equipped with a polarity identification circuit, which includes a first circuit and a second circuit. The controller (200) can identify the positive and negative terminals of the battery cell (600) when the contacts (130) of the two output interface devices (100) are in contact with the positive and negative terminals of the battery cell (600) respectively, and control the first circuit or the second circuit to be turned on.

9. The charging and discharging device according to claim 8, characterized in that, The charging and discharging device (10) further includes a display device (300), which is electrically connected to the controller (200).

10. The charging and discharging device according to claim 1, characterized in that, The charging and discharging device (10) is provided with a communication interface (400) and an AC input interface (500). The communication interface (400) is used to connect to the host computer, and the AC input interface (500) is used to connect to the power supply.

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