Lithium ion battery charging and discharging equipment and system

Abstract

The utility model relates to the field of lithium ion battery production, and discloses a lithium ion battery charging and discharging device and system. The equipment comprises at least one battery fixing position, each battery fixing position is provided with an electrode contact part, and each electrode contact part is used for being in contact connection with an electrode of a lithium ion battery fixed at the current battery fixing position; one sub-switch circuit is connected in series between the electrode contact part of each battery fixing position and the access end of the charging power supply or the discharge load, the control end of each sub-switch circuit is electrically connected with the safety control circuit, and at least one temperature sensor is arranged on each electrode contact part. The temperature sensor is electrically connected with the safety control circuit, the safety control circuit is used for controlling each sub-switch circuit according to a currently received detection temperature value, and when the temperature of the ith electrode contact part is detected to reach or be greater than a preset upper limit, the safety control circuit controls the ith sub-switch circuit to be switched off, and the ith electrode contact part is switched off. And the ith lithium ion battery is disconnected with a current loop of the charging power supply or the discharging load.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion battery production, in particular to a lithium ion battery charging and discharging device and system. Background Art

[0002] As people pay more and more attention to energy and environmental protection, lithium-ion batteries are used more and more widely. The formation of lithium-ion batteries is an important part of the preparation process of lithium-ion batteries. Formation is called activation. After the lithium battery is manufactured, the internal positive and negative electrode materials are activated through a certain charging and discharging method to improve the overall performance of the battery. Through a certain charging and discharging, the capacity and performance of each battery in the batch are also preliminarily evaluated in order to find and eliminate defective batteries in the batch, ensuring the stability and safety of the lithium-ion batteries in the batch; at the same time, through a certain charging and discharging, batteries with excellent cycle performance and consistent capacity are screened out to improve the consistency and reliability of the lithium-ion batteries in the same batch.

[0003] In order to improve production efficiency, lithium-ion battery manufacturers need to charge and discharge batches of batteries at the same time in the same space. When the battery charging time is too long or there is an abnormality in the internal structure of a battery, the current in the charging process may activate the electrochemical material and cause the battery pack to start heating up, which may cause the battery to catch fire, leading to a factory fire or equipment failure.

[0004] The inventor found in the process of researching the present invention that the charging and discharging protection of the charging equipment in the prior art usually automatically determines whether the charging circuit is turned on or off according to the voltage in the charging state. However, when the battery voltage is normal but the battery has a bulging abnormality, the device cannot detect the abnormality. Continuous charging will cause the battery to bulge or even catch fire and explode, thus causing major safety accidents such as fire, and it is impossible to effectively ensure product and production safety. Summary of the invention

[0005] One of the purposes of the embodiments of the present utility model is to provide a lithium-ion battery charging and discharging device and system. In the production process of lithium-ion batteries, the application of this solution is conducive to improving the production safety of lithium-ion batteries.

[0006] In a first aspect, an embodiment of the utility model provides a lithium-ion battery charging and discharging device, comprising:

[0007] At least one battery fixing position, each of which is provided with an electrode contact portion, each of which is used to contact and connect with an electrode of a lithium-ion battery fixed to the current battery fixing position;

[0008] A sub-switch circuit is connected in series between the electrode contact portion of each battery fixing position and the access terminal of the charging power supply or the discharging load, and the control terminal of each sub-switch circuit is electrically connected to the safety control circuit.

[0009] A temperature sensor, at least one temperature sensor is provided on each of the electrode contact portions, and the temperature sensor is electrically connected to the safety control circuit.

[0010] The safety control circuit is used to control each of the sub-switch circuits according to the currently received detected temperature value, including:

[0011] When it is detected that the temperature of the i-th electrode contact portion reaches or exceeds a predetermined upper limit, the safety control circuit controls the i-th sub-switch circuit to turn off, and the current loop between the i-th lithium-ion battery and the charging power source or the discharging load is disconnected.

[0012] The i-th electrode contact portion is an electrode contact portion provided at the i-th battery fixing position,

[0013] The i-th sub-switch circuit is the sub-switch circuit connected to the i-th electrode contact portion,

[0014] The i-th lithium-ion battery is a battery fixed at the i-th battery fixing position,

[0015] i is any natural number.

[0016] Optionally, it also includes,

[0017] At least one baffle plate, one baffle plate is provided between any two adjacent battery fixing positions, and in normal state, each baffle plate is located at the rear of each battery fixing position in the lateral direction.

[0018] At least one driving mechanism is connected to the rear end of each of the blocking plates, and is used to drive each of the blocking plates to move forward and backward. Each of the driving mechanisms is electrically connected to the safety control circuit.

[0019] When the temperature of the i-th electrode contact portion reaches or is greater than a predetermined upper limit, under the control of the safety control circuit, the two blocking plates on both sides of the i-th battery fixing position move forward to both sides of the i-th battery fixing position to block the i-th battery fixing position from other battery fixing positions.

[0020] Optionally, it also includes,

[0021] A cabinet frame is provided with a plurality of layers of panels, and a plurality of battery fixing positions are provided on each of the layers.

[0022] Optionally, it also includes,

[0023] One, two or all of the two side panels, top panel, and back panel,

[0024] The two side panels are arranged at the left and right ends of the cabinet frame, and each layer panel is located between the two side panels.

[0025] The top plate is arranged on the top of the cabinet frame, and each of the layer plates is located below the top plate.

[0026] The back plate is arranged on the back side of the cabinet frame, and each of the layer plates is located in front of the back plate.

[0027] Optionally, it also includes,

[0028] At least one fan is arranged on one or two or all of the side panels, the top panel, and the back panel, and each of the fans is electrically connected to the safety control circuit and / or the host computer.

[0029] Optionally, a plurality of pairs of horizontal guide rails extending horizontally front to back are further provided on the left and right sides of the cabinet frame, each pair of the horizontal guide rails comprising: a horizontal guide rail located at the left end and another horizontal guide rail located at the right end, which are in the same horizontal plane and parallel to each other.

[0030] The left and right ends of each layer plate are respectively carried on a pair of horizontal guide rails, and each layer plate can slide forward and backward along the two horizontal guide rails on which it is located.

[0031] Optionally, it also includes,

[0032] The main switch circuit is connected in series between all the sub-switch circuits of each lithium-ion battery charging and discharging device and the access end of the charging power supply or the discharging load, and the control end of the main switch circuit is electrically connected to the safety control circuit.

[0033] When the current charging environment temperature reaches a predetermined warning state, the main switch circuit is switched to an off state.

[0034] Optionally, at least one thermal imager is electrically connected to the safety control circuit and is used to monitor the space of the lithium-ion battery charging and discharging equipment in real time, obtain infrared thermal imaging, and transmit it to the safety control circuit in real time.

[0035] The safety control circuit is also used to determine whether the current charging environment temperature reaches a predetermined alarm state based on the current infrared thermal imaging. When the predetermined alarm state is reached, all the sub-switch circuits and / or the main switch circuit are switched to the off state.

[0036] Optionally, it also includes,

[0037] an audible and visual alarm, electrically connected to the safety control circuit,

[0038] When the current charging environment temperature reaches a predetermined alarm state, the sound and light alarm is in a working sound and light alarm state.

[0039] Optionally, the controller of the safety control circuit is a programmable logic controller.

[0040] In a second aspect, an embodiment of the utility model provides a lithium-ion battery charging and discharging system, comprising:

[0041] At least one lithium-ion battery charging and discharging device as described above,

[0042] At least one host computer, each host computer is electrically connected to the safety control circuit of at least one lithium-ion battery charging and discharging device, and is used to control the operation of each safety control circuit of each lithium-ion battery charging and discharging device according to a preset charging and discharging safety protection strategy.

[0043] Optionally, it also includes:

[0044] The safety service center equipment is electrically connected to each of the host computers and is used to control each of the host computers according to a preset charging and discharging safety protection strategy.

[0045] Optionally, it also includes:

[0046] At least one total sound and light alarm is electrically connected to each of the host computers and / or the security service center equipment,

[0047] When the current charging environment temperature of any of the lithium-ion battery charging and discharging devices reaches a predetermined alarm state, the general sound and light alarm is in a working sound and light alarm state.

[0048] During the research process of the present invention, the inventor discovered that, in practice, when a lithium-ion battery bulges abnormally, its voltage and current are not necessarily abnormal, and the lithium-ion battery does not necessarily catch fire or explode only after the voltage and current are abnormal. Therefore, the protection technical solution of the prior art that monitors the voltage and / or current and cuts off the charging circuit of a batch of lithium-ion batteries after the voltage and / or current are abnormal has low reliability and cannot effectively ensure production safety.

[0049] As can be seen from the above, compared with the prior art, in the batch charging or discharging of lithium-ion batteries, the technical solution of this embodiment is applied, and the temperature sensor is arranged at the electrode contact part to perform real-time temperature detection, so that the abnormality of each lithium-ion battery can be detected more effectively, more timely and more accurately. When the temperature is abnormal, the electrical connection of the lithium-ion battery with the abnormality is disconnected in time to avoid battery explosion and fire, thereby ensuring production safety, and not affecting the charging and discharging of other normal lithium-ion batteries, thereby ensuring production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute an improper limitation of the present invention.

[0051] Figure 1 A schematic diagram of the explosion structure of a lithium-ion battery charging and discharging device provided in Embodiment 1 of the present utility model;

[0052] Figure 2 Another exploded structural schematic diagram of the lithium-ion battery charging and discharging device provided in the first embodiment of the utility model;

[0053] Figure 3 A schematic diagram of the circuit principle of the lithium-ion battery charging and discharging safety protection device provided in the first embodiment of the utility model;

[0054] Figure 4 A schematic diagram of the circuit principle of the lithium-ion battery charging and discharging safety protection system provided in the second embodiment of the utility model;

[0055] Figure 5 This is a schematic diagram of the circuit principle of the lithium-ion battery charging and discharging safety protection system provided in Example 2 of the utility model.

[0056] 1: Cabinet frame; 2: Shelf; 3: Battery fixing position; 4: Electrode contact part; 5: Blocking plate;

[0057] 6: Sound and light alarm; 7: Side panel; 8: Fan; 9: Horizontal guide rail; 10: Top panel; 11: Back panel; 12: Thermal imager; 13: Host computer. DETAILED DESCRIPTION

[0058] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0059] Embodiment 1.

[0060] See also Figures 1 to 3 Show.

[0061] This embodiment provides a lithium-ion battery charging and discharging device.

[0062] The charging and discharging device includes a cabinet frame 1 as a bearing body, on which at least one or more layers of panels 2 are arranged, and on each layer of panels 2 are arranged a plurality of battery fixing positions 3 arranged in neat rows, each battery fixing position 3 being used to fix each lithium-ion battery S to be tested for charging and discharging.

[0063] Each battery fixing position 3 is provided with an electrode contact portion 4 (positive electrode and negative electrode that are insulated from each other) for being closely contacted and connected with the electrodes (positive electrode and negative electrode) of the lithium-ion battery S being charged or discharged.

[0064] As an illustration, a test clip with two insulated and isolated clamping parts can be used, but is not limited to, as an electrode contact part 4. After a lithium-ion battery S is placed in a battery fixing position 3, the electrodes "+" and "-" of the lithium-ion battery S are clamped on the two clamping parts of the test clip according to the corresponding positive and negative poles, and are closely contacted and connected to prevent the electrodes from being disengaged.

[0065] The device of this embodiment can be used for both charging and discharging of lithium-ion batteries S, that is, the cycle test of lithium-ion batteries S can be completed on the device of this embodiment. When used for charging, an external charging power supply is connected to the access end of the device, so that each electrode contact part 4 on each battery fixing position 3 is electrically connected to the charging power supply; when used for discharging, an external discharge load is connected to the access end of the device, so that each electrode contact part 4 on each battery fixing position 3 is electrically connected to the discharge load. Whether charging or using electricity, the electrode contact part 4 on each battery fixing position 3 is used as the electrical connection component between each lithium-ion battery S under test and the access end of the charging power supply or the discharge load.

[0066] The device can be used to charge and discharge lithium-ion batteries S in batches, thereby improving production efficiency.

[0067] In an embodiment, at least one temperature sensor is provided on the electrode contact portion 4 of each battery fixing position 3, each temperature sensor is electrically connected to a safety control circuit, each temperature sensor detects the temperature of the electrode contact portion 4 where it is located in real time, and each temperature sensor reports the temperature detection result to the safety control circuit in real time, so that the safety control circuit can determine whether the state of each lithium-ion battery S on each battery fixing position 3 is abnormal according to the current temperature detection result.

[0068] A switch circuit (referred to as a sub-switch circuit) is connected in series between the electrode contact portion 4 of each battery fixing position 3 and the access terminal of the charging power source or the discharging load.

[0069] For the convenience of description, any sub-switch circuit is denoted as the i-th sub-switch circuit, the i-th sub-switch circuit is connected between the access end of the charging power supply or the discharging load and the i-th electrode contact portion 4, the i-th electrode contact portion 4 is arranged on the i-th battery fixing position 3, and the battery on the i-th battery fixing position 3 is denoted as the i-th lithium-ion battery Si, where i is any natural number.

[0070] When the i-th sub-switch circuit is in the on state, the circuit between the i-th electrode contact portion 4 and the charging power source or the discharging load is a passage, and the i-th lithium-ion battery Si and the charging power source or the discharging load form a current loop.

[0071] When the i-th sub-switch circuit is in the off state, the circuit between the i-th electrode contact portion 4 and the charging power source or the discharging load is disconnected, and the circuit between the i-th lithium-ion battery Si and the charging power source or the discharging load is open.

[0072] The control end of each sub-switch circuit is electrically connected to the safety control circuit respectively. The safety control circuit controls the on or off of each sub-switch circuit according to the temperature detection result of each electrode contact part 4 transmitted by each temperature sensor.

[0073] Control principle: For example, when the safety control circuit detects that the temperature of the current i-th electrode contact part 4 reaches or exceeds the predetermined upper limit, the safety control circuit sends a shutdown trigger instruction to the control end of the i-th sub-switch circuit to control the i-th sub-switch circuit to shut down, disconnect the connection between the access end of the charging power supply or the discharging load and the i-th lithium-ion battery Si, disconnect the circuit between the positive and negative electrodes of the i-th lithium-ion battery Si, and stop charging or discharging.

[0074] As an illustration of this embodiment, this embodiment selects a sub-switch circuit that is in an off state under normal conditions.

[0075] The application principle of the charging and discharging device of this embodiment is to install batches of lithium-ion batteries S one by one on each battery fixing position 3, and tightly contact and connect the positive and negative electrodes of each lithium-ion battery with the positive and negative electrodes of the electrode contact part 4 of the battery fixing position 3 where it is located, and connect the charging power supply or the discharging load to the device. The charging power supply or the discharging load is electrically connected to each lithium-ion battery S located on each battery fixing position 3 through each sub-switch circuit. When each sub-switch circuit is turned on, each lithium-ion battery S forms a current loop with the charging power supply or the discharging load, so as to realize the charging or discharging of each lithium-ion battery S.

[0076] During the charging or discharging process, each temperature sensor detects the temperature of the electrode contact portion 4 where it is located in real time, and inputs it into the safety control circuit in real time. The safety control circuit controls the conduction or shutdown of each sub-switch circuit according to the received temperature detection results, so as to control the conduction or shutdown of the circuit between each lithium-ion battery S and the charging power supply or discharging load.

[0077] As an illustration of this embodiment, each temperature sensor is arranged at the end of each electrode contact portion 4, so that when the positive and negative poles of the electrode contact portion 4 are in contact with the positive and negative electrodes of the lithium-ion battery S, the temperature sensor thereon is also in contact with the electrodes of the lithium-ion battery S, so that the detected temperature is the temperature of the electrodes of the lithium-ion battery S, and the temperature detection value is closer to the current temperature of the lithium-ion battery S, thereby improving the reliability of the charge and discharge safety protection.

[0078] During the research process of the present invention, the inventors found that, in practice, when a lithium-ion battery bulges abnormally, its voltage and current are not necessarily abnormal, and the lithium-ion battery S does not necessarily catch fire or explode only after the voltage and current are abnormal. Therefore, the protection technical solution of the prior art that monitors the voltage and / or current and cuts off the charging circuit of a batch of lithium-ion batteries S after the voltage and / or current are abnormal has low reliability and cannot effectively ensure production safety.

[0079] As can be seen from the above, compared with the prior art, in the batch charging or discharging of lithium-ion batteries S, the technical solution of this embodiment is applied, and the temperature sensor is arranged at the electrode contact portion 4 to perform real-time temperature detection, so that the abnormality of each lithium-ion battery S can be detected more effectively, more timely and more accurately. When the temperature is abnormal, the electrical connection of the lithium-ion battery S with the current abnormality is disconnected in time to avoid battery explosion and fire, thereby ensuring production safety, and not affecting the charging and discharging of other normal lithium-ion batteries S, thereby ensuring production efficiency.

[0080] As an illustration of this embodiment, this embodiment is illustrated by providing multiple rows of battery fixing positions 3 on the cabinet frame 1 to charge and discharge batches of lithium-ion batteries S, but is not limited thereto. The battery fixing positions 3 on the cabinet frame 1 may be one row or multiple rows, and may be arranged in rows or columns, or in other arrangements. This solution can improve production efficiency and increase production capacity.

[0081] As an illustration of this embodiment, a plurality of baffle plates 5 are provided, so that each battery fixing position 3 has a baffle plate 5 on both sides, and a driving mechanism is connected to the rear end of each baffle plate 5, and each driving mechanism is electrically connected to the safety control circuit.

[0082] When the battery is normally charged and discharged, or when the device is not in operation, each baffle plate 5 is located laterally behind each battery fixing position 3, that is, both sides of each battery fixing position 3 are empty, which is convenient for user operation and air flow to improve heat dissipation effect.

[0083] When the safety control circuit determines that the ith lithium-ion battery Si is in an abnormal state according to the received temperature detection values, the safety control circuit not only cuts off the sub-switch circuit connected to the abnormal ith lithium-ion battery Si, but also controls the driving mechanism at the same time, so that the driving mechanism drives the barrier plates 5 on both sides of the abnormal ith lithium-ion battery Si, so that the two barrier plates 5 move forward until the two barrier plates 5 block the two sides of the abnormal ith lithium-ion battery Si, and the abnormal ith lithium-ion battery Si is spatially separated from other normal batteries, so as to avoid the explosion or fire of the abnormal battery affecting other normal batteries, avoid causing a larger fire, and avoid production safety accidents. Among them, the barrier plates 5 are made of fire-resistant and high-temperature resistant materials.

[0084] As an illustration of this embodiment, the driving mechanism can be, but is not limited to, a cylinder, and can also be, but is not limited to, a mechanical driving mechanism including a spring. For example, the spring is connected to the rear end of the baffle plate 5. In normal conditions, the baffle plate 5 is positioned laterally behind each battery fixing position 3. The springs connected to each baffle plate 5 are in a compressed state. When an abnormal battery is detected, the safety control circuit controls the driving mechanism of the baffle plates 5 on both sides of the abnormal battery, so that the limit portion compressed by the Xingding spring is released, the spring elastic force is restored, and the baffle plate 5 is pushed forward to the side of the abnormal battery. The above is only an example of an implementation scheme of the driving mechanism. For details, please refer to the prior art.

[0085] As an illustration of this embodiment, a main switch circuit may be further provided in the system, which is connected in series between all sub-switch circuits and the access terminals of the charging power source or the discharging load. When the main switch circuit is disconnected, the circuits between the positive and negative electrodes of all lithium-ion batteries S on all battery fixing positions 3 are disconnected, and all batteries stop charging and discharging. In this way, when the safety control circuit determines that the current charging and discharging environment temperature reaches a predetermined alarm state based on the current temperature detection parameters, the safety control circuit controls the main switch circuit to shut down.

[0086] As this embodiment, an audible and visual alarm 6 is further provided at a conspicuous position on the top of the device, and the audible and visual alarm 6 is electrically connected to the safety control circuit of the device. When the safety control circuit determines that the current charging and discharging environment temperature reaches a predetermined alarm state, the audible and visual alarm 6 sends out an audible and visual alarm to remind the user to eliminate the safety fault in time to avoid causing a larger explosion or fire, so as to keep the alarm bell ringing and avoid major safety accidents.

[0087] As an illustration of this embodiment, two side panels 7 are respectively provided at the left and right ends of the cabinet frame 1 of this embodiment, and each layer of panels 2 is located between the left and right side panels 7. The two side panels 7 isolate the charged and discharged lithium-ion batteries S located on each layer of panels 2 from the external space, which is helpful to slow down the spread caused by battery failure.

[0088] As an illustration of this embodiment, the top of the cabinet frame 1 is also covered with a top plate 10, and the charge and discharge protection mechanism on each layer plate 2 is located in the space below the top plate 10. In addition, the back of the cabinet frame 1 is covered with a back plate 11. The use of this design is conducive to improving the dust and moisture resistance of the equipment, and separating the charge and discharge space of the lithium-ion battery S from the external space from the top and back, slowing down the spread of accidents caused by battery failure and ensuring production safety. As an illustration of this embodiment, a fan 8 can also be set on the top plate 10 and the back plate 11 to further improve the heat dissipation effect.

[0089] As an illustration of this embodiment, fans 8 are also provided on one, both or all of the two side plates 77, the top plate 10 and the back plate 11. Each fan 8 is further electrically connected to the safety control circuit through a switch circuit. When the lithium-ion battery charging and discharging device of this embodiment is in working state, the safety control circuit controls the switch circuit connected to the fan 8 to automatically start the fan 8, accelerate the air flow in the charging and discharging space, and improve the heat dissipation effect.

[0090] As shown in the figure, three fans 8 are respectively arranged on the left and right side panels 7, and each fan 8 is electrically connected to the safety control circuit.

[0091] As an illustration of this embodiment, a plurality of pairs of horizontal guide rails 9 are respectively provided on the left and right sides of the cabinet frame 1 of this embodiment, and the number of pairs of horizontal guide rails 9 is consistent with the number of layers of the layer board 2. Each pair of horizontal guide rails 9 is composed of two horizontal guide rails 9 at the same horizontal height, wherein one horizontal guide rail 9 is located at the left end of the cabinet frame 1, and the other horizontal guide rail 9 is located at the right end of the cabinet frame 1, and both extend in the front-back direction.

[0092] Each layer of the layer plate 2 is located on each pair of horizontal guide rails 9, and each layer of the layer plate 2 can be translated forward and backward along the two horizontal guide rails 9. In this way, when the user fixes the lithium-ion battery S to each battery fixing position 3 on the layer plate 2, or when the user removes each lithium-ion battery S from the layer plate 2, or when the lithium-ion battery S of a certain layer needs to be operated, the user can pull out the layer plate 2 horizontally forward, which is convenient for the user to operate. After the user completes the operation, the layer plate 2 can be pushed horizontally backward to perform the charge and discharge test of the lithium-ion battery S. The adoption of this solution is conducive to improving production efficiency.

[0093] As an illustration of this embodiment, the controller of the safety control circuit of this embodiment is a programmable logic controller (PLC for short), and the user pre-burns the safety protection control program in the PLC.

[0094] As an illustration of this embodiment, one or more thermal imagers 12 are also installed. The thermal imager 12 is preferably able to fully and clearly take pictures of the space of the corresponding lithium-ion battery charging and discharging equipment.

[0095] The thermal imager 12 monitors the space of the corresponding lithium-ion battery charging and discharging equipment in real time, obtains infrared thermal images, and transmits them to a safety control circuit in real time. The safety control circuit performs charging and discharging protection on the lithium-ion battery S on the equipment according to the infrared thermal images. For example, when an infrared imager detects that the temperature in the space of a lithium-ion battery charging and discharging equipment reaches or exceeds a certain upper limit, and reaches or exceeds a predetermined alarm range, the safety control circuit turns off all sub-switch circuits on the equipment, disconnecting the circuit between the positive and negative electrodes of all lithium-ion batteries S on the equipment; or, the safety control circuit only turns off the sub-switch circuits and / or the main switch circuit of each battery fixing position 3 within the temperature abnormal range or a certain range including the abnormal range, disconnecting the circuit between the positive and negative electrodes of this part of the lithium-ion battery S, avoiding the expansion of the abnormality, and not affecting the charging and discharging of other normal lithium-ion batteries S on the equipment, which ensures both production safety and production efficiency.

[0096] Embodiment 2.

[0097] See Figures 4 and 5.

[0098] This embodiment provides a system including at least one lithium-ion battery charging and discharging device described in Embodiment 1. The structure and working principle of each device refer to Embodiment 1.

[0099] The system also includes: a host computer 13, which is used to control the safety control circuits of various charging and discharging devices.

[0100] Each lithium-ion battery charging and discharging device corresponds to one or more thermal imagers 12. The thermal imager 12 can be installed on the lithium-ion battery charging and discharging device or outside the device, preferably to be able to take a clear picture of the space of the corresponding lithium-ion battery charging and discharging device.

[0101] The thermal imager 12 monitors the space of the corresponding lithium-ion battery charging and discharging device in real time, obtains infrared thermal imaging, and transmits it to a host computer 13 in real time. The host computer 13 is connected to the safety control circuit on each lithium-ion battery charging and discharging device through a data line or a wireless communication network. The host computer 13 controls the operation of each safety control circuit of each lithium-ion battery charging and discharging device according to a predetermined charging and discharging protection strategy, and controls the charging and discharging safety of one or more lithium-ion battery charging and discharging devices.

[0102] For example, the user presets on the host computer 13 that when an infrared imager detects that the temperature in the space of a lithium-ion battery charging and discharging device reaches or exceeds a certain upper limit and reaches or exceeds a predetermined alarm range, the host computer 13 controls the safety control circuit of the device in the alarm state, and the safety control circuit of the device turns off all sub-switch circuits on the device, disconnecting the circuit between the positive and negative electrodes of all lithium-ion batteries S on the device; or, the host computer 13 only controls the safety control circuit of the alarm device to turn off the sub-switch circuits of each battery fixing position 3 within the temperature abnormal range or a certain range including the abnormal range, disconnecting the circuit between the positive and negative electrodes of this part of the lithium-ion battery S, avoiding the expansion of the abnormality and not affecting the charging and discharging of other normal lithium-ion batteries S on the device, thereby ensuring both production safety and production efficiency.

[0103] As an illustration of this embodiment, the host computer 13 can be further electrically connected to the control end of the main switch circuit and / or electrically connected to the control end of the main switch circuit through the safety control circuit of each charging and discharging device. In this way, when the host computer 13 determines that the current charging and discharging environment temperature reaches a predetermined alarm state based on the current infrared imaging, the host computer 13 can directly control the main switch circuit to turn off the main switch circuit, or turn it off through the safety control circuit.

[0104] As this embodiment, the host computer 13 can be further connected to the sound and light alarm 6 of each device by wire or network, and / or connected to the sound and light alarm 6 of each device through the safety control circuit of each device. When the host computer 13 detects any abnormality, the sound and light alarm 6 also sends out a sound and light alarm.

[0105] As an illustration of this embodiment, the host computer 13 of this embodiment may be a computer host server, which may be but is not limited to having a display.

[0106] As an illustration of this embodiment, a host computer 13 can control multiple lithium-ion charging and discharging devices, and each device corresponds to one or more thermal imagers 12, thus forming a system unit. For example, multiple lithium-ion battery charging and discharging devices are provided in one laboratory or multiple laboratories, and the safety control circuits of these charging and discharging devices and the corresponding infrared imagers are electrically connected to a host computer 13 respectively. The tester can centrally control the charging and discharging safety of multiple charging and discharging devices on the host computer 13, which is conducive to saving manpower.

[0107] As an illustration of this embodiment, this embodiment can also set up multiple system units, and each host computer 13 of these system units is electrically connected to a security service center device to form a more extensive charging and discharging system. The security service center device serves as a user-oriented centralized control center to control each host computer 13, and each host computer 13 is electrically connected to at least one thermal imager 12 and at least one charging and discharging device, and each charging and discharging device can be in one laboratory or distributed in different laboratories.

[0108] The lithium ion charge and discharge safety control system of this embodiment is used in the mass production of lithium ion batteries S, which is conducive to centralized control, saves labor, and can detect the abnormality of each lithium ion battery S more effectively, more timely, and more accurately. When the temperature is abnormal, the electrical connection of the lithium ion battery S with the current abnormality is disconnected in time to avoid battery explosion and fire, thereby ensuring production safety, and not affecting the charging and discharging of other normal lithium ion batteries S, thereby ensuring production efficiency.

[0109] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. A lithium-ion battery charging and discharging device, characterized in that: include: At least one battery fixing position, each of which is provided with an electrode contact portion, each of which is used to contact and connect with an electrode of a lithium-ion battery fixed to the current battery fixing position; A sub-switch circuit is connected in series between the electrode contact portion of each battery fixing position and the access terminal of the charging power supply or the discharging load, and the control terminal of each sub-switch circuit is electrically connected to the safety control circuit. A temperature sensor, at least one temperature sensor is provided on each of the electrode contact portions, and the temperature sensor is electrically connected to the safety control circuit. The safety control circuit is used to control each of the sub-switch circuits according to the currently received temperature detection value, include, When it is detected that the temperature of the i-th electrode contact portion reaches or exceeds a predetermined upper limit, the safety control circuit controls the i-th sub-switch circuit to turn off, and the current loop between the i-th lithium-ion battery and the charging power source or the discharging load is disconnected. The i-th electrode contact portion is an electrode contact portion provided at the i-th battery fixing position, The i-th sub-switch circuit is the sub-switch circuit connected to the i-th electrode contact portion, The i-th lithium-ion battery is a battery fixed at the i-th battery fixing position, i is any natural number.

2. The lithium-ion battery charging and discharging device according to claim 1, characterized in that: Also includes, At least one baffle plate, one baffle plate is provided between any two adjacent battery fixing positions, and in normal state, each baffle plate is located at the rear of each battery fixing position in the lateral direction. At least one driving mechanism is connected to the rear end of each of the blocking plates, and is used to drive each of the blocking plates to move forward and backward. Each of the driving mechanisms is electrically connected to the safety control circuit. When the temperature of the i-th electrode contact portion reaches or is greater than a predetermined upper limit, under the control of the safety control circuit, the two blocking plates on both sides of the i-th battery fixing position move forward to both sides of the i-th battery fixing position to block the i-th battery fixing position from other battery fixing positions.

3. The lithium-ion battery charging and discharging device according to claim 2, characterized in that: Also includes, A cabinet frame, on which a plurality of layers of panels are arranged, Each of the baffle plates and each of the batteries is fixedly disposed on each of the layer plates.

4. The lithium-ion battery charging and discharging device according to claim 3, characterized in that: Also includes, One, two or all of the two side panels, top panel, and back panel, The two side panels are arranged at the left and right ends of the cabinet frame, and each layer panel is located between the two side panels. The top plate is arranged on the top of the cabinet frame, and each of the layer plates is located below the top plate. The back plate is arranged on the back side of the cabinet frame, and each of the layer plates is located in front of the back plate.

5. The lithium-ion battery charging and discharging device according to claim 4, characterized in that: Also includes, At least one fan is arranged on one or two or all of the side panels, top panels, and back panels, and each of the fans is electrically connected to the safety control circuit and / or the host computer.

6. The lithium-ion battery charging and discharging device according to claim 3, characterized in that: On the left and right sides of the cabinet frame, there are also multiple pairs of horizontal guide rails extending horizontally front and back, each pair of the horizontal guide rails includes: a horizontal guide rail located at the left end and another horizontal guide rail located at the right end, which are in the same horizontal plane and parallel to each other. The left and right ends of each layer plate are respectively carried on a pair of horizontal guide rails, and each layer plate can slide forward and backward along the two horizontal guide rails on which it is located.

7. The lithium-ion battery charging and discharging device according to claim 1, characterized in that: Also includes, The main switch circuit is connected in series between all the sub-switch circuits of each lithium-ion battery charging and discharging device and the access end of the charging power supply or the discharging load, and the control end of the main switch circuit is electrically connected to the safety control circuit. When the current charging environment temperature reaches a predetermined warning state, the main switch circuit is switched to an off state.

8. The lithium-ion battery charging and discharging device according to claim 1, characterized in that: At least one thermal imager is electrically connected to the safety control circuit and is used to monitor the space of the lithium-ion battery charging and discharging equipment in real time, obtain infrared thermal images, and transmit them to the safety control circuit in real time. The safety control circuit is also used to determine whether the current charging environment temperature reaches a predetermined alarm state based on the current infrared thermal imaging. When the predetermined alarm state is reached, all the sub-switch circuits and / or the main switch circuit are switched to the off state.

9. The lithium-ion battery charging and discharging device according to claim 8, characterized in that: Also includes, an audible and visual alarm, electrically connected to the safety control circuit, When the current charging environment temperature reaches a predetermined alarm state, the sound and light alarm is in a working sound and light alarm state.

10. The lithium-ion battery charging and discharging device according to claim 8, characterized in that: The controller of the safety control circuit is a programmable logic controller.

11. A lithium-ion battery charging and discharging system, characterized in that: include: At least one lithium-ion battery charging and discharging device according to any one of claims 1 to 10, At least one host computer, each of which is electrically connected to the safety control circuit of at least one of the lithium-ion battery charging and discharging devices, and is used to control the operation of each of the safety control circuits of each of the lithium-ion battery charging and discharging devices according to a preset charging and discharging safety protection strategy.

12. The lithium-ion battery charging and discharging system according to claim 11, characterized in that include: The safety service center equipment is electrically connected to each of the host computers and is used to control each of the host computers according to a preset charging and discharging safety protection strategy.

13. The lithium-ion battery charging and discharging system according to claim 12, characterized in that include: At least one total sound and light alarm is electrically connected to each of the host computers and / or the security service center equipment, When the current charging environment temperature of any of the lithium-ion battery charging and discharging devices reaches a predetermined alarm state, the general sound and light alarm is in a working sound and light alarm state.

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