Tandem type cylindrical lithium ion battery charging and discharging mechanism

Abstract

A tandem type cylindrical lithium ion battery charging and discharging mechanism comprises a rack, and the interior of the rack is divided into a left compartment and a right compartment by a vertical partition plate; three charging and discharging movement mechanisms are arranged in the left compartment, each charging and discharging movement mechanism comprises twelve needle beds which are flush with the battery trays up and down, and six needle beds form a group to be connected with a charging and discharging driving assembly in the right compartment in series; according to the device, a series charging and discharging method is adopted for supplying power to a high-voltage direct-current bus, so that the charging and discharging currents of the cylindrical lithium ion battery are highly consistent, and the capacity consistency in the battery manufacturing process can be improved; a series circuit is higher than a parallel circuit in applicable voltage, and cable heat loss is reduced; on the premise that the charging and discharging efficiency of the battery is not reduced, an inversion conversion link of converting direct current into alternating current is eliminated, the number of power devices and energy consumption are reduced, and the occupied space of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a series-connected cylindrical lithium-ion battery charger / discharger. Background Art

[0002] With the increasingly wide application of lithium-ion batteries, the production cost of lithium-ion batteries also restricts the ex-factory price of their related products. Lithium-ion battery manufacturers are all trying their best to reduce production costs and improve the competitiveness of their own products. In the production process of lithium batteries, the process of activating the positive and negative electrode materials inside the lithium batteries through a certain charging and discharging method to improve the charging and discharging performance, self-discharge, storage and other comprehensive performances of the batteries is called formation. The process of sorting the battery capacity and screening and grading the performance through the charging and discharging method is called grading. The lithium-ion battery charging and discharging equipment is an important production equipment in the battery manufacturer's production line, with a large usage amount and a huge investment amount.

[0003] The invention with the publication number of 117976994A discloses a battery charging and discharging linkage mechanism. The device is provided with a plurality of charging and discharging mechanisms with a needle bed arranged at the top, a battery tray arranged at the bottom, and the distance between the needle bed and the battery tray adjusted by a cylinder. The structure is simple and the occupied space is small. However, most of the cylindrical lithium-ion battery chargers / dischargers including this prior art adopt a parallel charging and discharging method, which has the disadvantages of many control modules, large equipment investment, large equipment occupied space, large amount of connecting cables used, low efficiency, and uneven battery capacity consistency in the manufacturing process due to inconsistent currents, etc., seriously restricting the direct production cost of lithium-ion batteries.

[0004] In view of the above problems existing in the existing cylindrical lithium-ion battery chargers / dischargers, the utility model proposes a series-connected cylindrical lithium-ion battery charger / discharger. Summary of the Invention

[0005] The utility model proposes a series-connected cylindrical lithium-ion battery charging and discharging mechanism for the above problems.

[0006] The series-connected cylindrical lithium-ion battery charging and discharging mechanism includes a rectangular bottom plate. Define the two pairs of sides of the bottom plate as the front side and the rear side, and the other two sides as the left side and the right side; a left vertical plate perpendicular to the bottom plate is provided on the left side of the bottom plate, a right vertical plate perpendicular to the bottom plate is provided on the right side of the bottom plate, the top of the left vertical plate and the right vertical plate are connected with a top plate, and the top plate is parallel to the bottom plate; the bottom plate, the left vertical plate, the right vertical plate and the top plate are connected to form a cuboid frame; a vertical partition is connected between the top plate and the bottom plate, and the vertical partition divides the space inside the frame into a left compartment and a right compartment;

[0007] The left compartment is provided with two mechanism partitions connecting the left vertical plate and the vertical partition. The mechanism partitions divide the left compartment into three equal-height mechanism storage positions in the vertical direction, and each mechanism storage position is provided with a charge-discharge motion mechanism. The right compartment is provided with two component partitions connecting the right vertical plate and the vertical partition. The component partitions divide the right compartment into three equal-height component storage positions in the vertical direction, and each component storage position is provided with a drive component.

[0008] The charge-discharge motion mechanism includes a mechanism bottom frame. At the left and right ends of the top of the mechanism bottom frame, lower limit blocks are fixed, and a mechanism middle frame is provided on the top of the lower limit blocks. In the center of the top of the mechanism middle frame, there is a battery tray, and a number of batteries are carried inside the battery tray. On the left and right sides of the battery tray, there are tray limit blocks fixed on the mechanism middle frame. At both left and right ends of the mechanism middle frame, there are vertical cylinder pull rods, and cylinders are provided at the tops of the cylinder pull rods. The tops of the cylinders are connected to a mechanism top frame. Four vertical guide shafts pass through the mechanism middle frame. The tops of the guide shafts are connected to the mechanism top frame, and the bottoms of the guide shafts are connected to the mechanism bottom frame. Linear bearings are sleeved on the guide shafts, and the linear bearings are all located at the top of the mechanism middle frame. At the bottom of the mechanism top frame, there is a needle bed support block, and twelve needle beds flush with each other on the left and right are fixed on the needle bed support block. At the bottom of the mechanism top frame, there is a vertical upper limit rod.

[0009] The needle bed includes a needle bed outer frame extending forward and backward. The needle bed outer frame includes a needle bed upper top plate connected to the needle bed support block. The front side of the needle bed upper top plate is connected to a needle bed front vertical plate, and the rear side of the needle bed upper top plate is connected to a needle bed rear vertical plate. The lower end of the needle bed upper top plate is connected to a channel plate mounting bracket extending forward and backward. Between the needle bed front vertical plate and the needle bed rear vertical plate at the lower end of the channel plate mounting bracket, there are three battery insertion channel plates arranged in the front-to-back direction, and intermediate support rods are connected between adjacent battery insertion channel plates. Inside each of the battery insertion channel plates, there are four groups of battery insertion circuits arranged from front to back, and at the bottom of each of the battery insertion channel plates, there are four groups of probe assemblies arranged from front to back. The positions of the probe assemblies and the battery insertion circuits correspond one by one vertically.

[0010] The probe assembly includes a temperature needle, a positive electrode probe, and a negative electrode probe that are vertically downward. A temperature sensor is contained in the temperature needle. The positive electrode probe includes a positive electrode current needle and a positive electrode voltage needle, and the negative electrode probe includes a negative electrode current needle and a negative electrode voltage needle. The positive electrode voltage needle and the negative electrode voltage needle extend upward into the battery insertion channel plate. The positive electrode current needle faces downward directly at the positive electrode tab of the battery, and the negative electrode current needle faces downward directly at the negative electrode tab of the battery. The positive electrode voltage needle and the negative electrode voltage needle are both connected to a voltage and temperature acquisition connector through acquisition cables.

[0011] The battery connection circuit includes a positive current terminal and a negative current terminal. The positive current terminal is connected to the positive probe through a positive current line, and the negative current terminal is connected to the negative probe through a negative current line. A transfer positive terminal is provided at the front end of each battery connection channel board at the frontmost side of the bed of needles. A transfer copper sheet is provided at the front end of each of the two battery connection channel boards at the rear side of the bed of needles. The transfer copper sheet connects the negative current terminal at the rearmost end of the previous battery connection channel board to the positive current terminal at the foremost end of the subsequent battery connection channel board. The front end of the transfer positive terminal is connected to the positive terminal of the bed of needles, and the negative terminal of the bed of needles led out from the negative current terminal at the rearmost end of the bed of needles is connected to the front side of the lower end of the outer frame of the bed of needles.

[0012] The driving assembly includes an electrical support. A control box is provided at the top of the electrical support. The interior of the control box includes a control auxiliary electrical component and a controller. The controller and the control auxiliary electrical component are electrically connected to a cylinder. A driving box is provided at the top of the control box. The driving box includes a driving box body, and two charge and discharge driving units are provided inside the driving box body. A high-voltage positive connector, a high-voltage negative connector, a driving positive connector, and a driving negative connector are provided at the front end of the charge and discharge driving unit. The driving positive connector of one of the charge and discharge driving units is connected to the positive terminal of the bed of needles on the sixth bed of needles from left to right, and the driving negative connector of this charge and discharge driving unit is connected to the negative terminal of the bed of needles on the first bed of needles from left to right. The driving positive connector of the other charge and discharge driving unit is connected to the positive terminal of the bed of needles on the twelfth bed of needles from left to right, and the driving negative connector of this charge and discharge driving unit is connected to the negative terminal of the bed of needles on the seventh bed of needles from left to right. The positive terminals of the first to fifth beds of needles from left to right are connected to the negative terminals of the beds of needles on the right side of this bed of needles through wires. The positive terminals of the seventh to eleventh beds of needles from left to right are connected to the negative terminals of the beds of needles on the right side of this bed of needles through wires. Both the high-voltage positive connector and the high-voltage negative connector are connected to a high-voltage DC power supply.

[0013] More specifically, the battery tray carries batteries arranged in twelve rows and twelve columns.

[0014] More specifically, four hinges are provided on the left vertical plate and the mechanism partition from top to bottom. A pair of double doors is connected to the left vertical plate and the mechanism partition through the hinges. A door handle is provided in the middle of the double doors, and a heat dissipation fan is provided on the double doors. The two double doors can be closed to enclose the left compartment.

[0015] More specifically, a cabinet door is connected to the right vertical plate through a hinge, and the cabinet door can be rotated to close the right compartment. The cabinet door is provided with a hollow iron net, a door handle, a main power switch, and an indicator light.

[0016] The working steps of the present utility model include: an external operator turns on the main power switch, and the controller controls the cylinder to contract. The cylinder pulls upward until the upper limit rod contacts the middle frame of the mechanism. The battery tray rises with the middle frame of the mechanism and contacts the battery. The charge and discharge drive unit connects to the battery, causing the batteries at the bottoms of the first to sixth needle beds from left to right to be connected in series, and the batteries at the bottoms of the seventh to twelfth needle beds from left to right to be connected in series, and starts charging and discharging the battery.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: The series charging and discharging method is adopted for high-voltage DC bus power supply, making the charging and discharging currents of cylindrical lithium-ion batteries highly consistent, and improving the capacity consistency during battery manufacturing; The applicable voltage of the series circuit is higher than that of the parallel circuit, reducing the cable heat loss; Without reducing the battery charging and discharging efficiency, the inverter conversion link from direct current to alternating current is eliminated, reducing the number of power devices and energy consumption; The needle bed integrates the probe and the battery cutting channel plate, reducing the mechanism volume, reducing the cable usage, and reducing the occupied space of the equipment; The modular degree of the needle bed is high, with a small volume and easy to operate, reducing the labor intensity of the operator. Description of the Drawings

[0018] Figure 1 It is the external structure diagram of a series-type cylindrical lithium-ion battery charging and discharging mechanism of the present utility model.

[0019] Figure 2 It is the internal structure diagram of the present utility model.

[0020] Figure 3 It is the structure diagram of the battery tray of the present utility model.

[0021] Figure 4 It is the structure diagram of the charge and discharge motion mechanism of the present utility model.

[0022] Figure 5 It is the structure diagram of the needle bed of the present utility model.

[0023] Figure 6 It is the structure diagram of the battery cutting circuit of the present utility model.

[0024] Figure 7 It is the structure diagram of the drive box of the present utility model.

[0025] Figure 8 It is the connection circuit diagram of the charge and discharge drive unit and the needle bed of the present utility model. Detailed Implementation Modes

[0026] The following will describe in detail the specific implementation manners of the embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present utility model, and are not used to limit the embodiments of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0031] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0032] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0033] A series-connected cylindrical lithium-ion battery charging and discharging mechanism includes a rectangular bottom plate 3. Define two pairs of sides of the bottom plate 3 as the front side and the rear side, and the other two sides as the left side and the right side; a left vertical plate 2 perpendicular to the bottom plate is provided on the left side of the bottom plate 3, a right vertical plate 5 perpendicular to the bottom plate is provided on the right side of the bottom plate, and the tops of the left vertical plate 2 and the right vertical plate 5 are connected with a top plate 1, and the top plate 1 is parallel to the bottom plate; the bottom plate, the left vertical plate, the right vertical plate, and the top plate are connected to form a cuboid frame; a vertical partition 4 is connected between the top plate 1 and the bottom plate 3, and the vertical partition 4 divides the space inside the frame into a left compartment 17 and a right compartment 18;

[0034] Two mechanism partitions 10 connecting the left vertical plate 2 and the vertical partition 4 are provided in the left compartment. The mechanism partitions 10 divide the left compartment 17 into three equally high mechanism storage positions in the vertical direction, and a charging and discharging motion mechanism 8 is provided in each mechanism storage position; two component partitions 12 connecting the right vertical plate 5 and the vertical partition 4 are provided in the right compartment 18. The component partitions 12 divide the right compartment into three equally high component storage positions in the vertical direction, and a driving component 9 is provided in each component storage position;

[0035] The charging and discharging movement mechanism includes a mechanism bottom frame 803. At the left and right ends of the top of the mechanism bottom frame 803, lower limit blocks 807 are fixed. An intermediate mechanism frame 802 is provided on the top of the lower limit block 807. In the center of the top of the intermediate mechanism frame 802, there is a battery tray 14. A number of batteries 15 are carried inside the battery tray 14. On the left and right sides of the battery tray 14, tray limit blocks 808 fixed to the intermediate mechanism frame 802 are provided. Vertical cylinder pull rods 806 are provided at both the left and right ends of the intermediate mechanism frame 802. Cylinders 804 are provided at the tops of the cylinder pull rods 806. The tops of the cylinders 804 are connected to a mechanism top frame 801. Four vertical guide shafts 810 are passed through the intermediate mechanism frame 802. The tops of the guide shafts 810 are connected to the mechanism top frame 801, and the bottoms of the guide shafts 810 are connected to the mechanism bottom frame 803. Linear bearings 809 are sleeved on the guide shafts 810, and the linear bearings 809 are all located at the top of the intermediate mechanism frame 802. At the bottom of the mechanism top frame 801, there is a bed of needles support block 812. Twelve beds of needles 811 flush with each other left and right are fixed on the bed of needles support block 812. A vertical upper limit rod 805 is provided at the bottom of the mechanism top frame 801;

[0036] The bed of needles includes a bed of needles outer frame 8113 extending forward and backward. The bed of needles outer frame 8113 includes a bed of needles upper top plate 8130 connected to the bed of needles support block. A bed of needles front vertical plate 8114 is connected to the front side of the bed of needles upper top plate 8130, and a bed of needles rear vertical plate 8117 is connected to the rear side of the bed of needles upper top plate 8130. A channel plate mounting bracket 8118 extending forward and backward is connected to the lower end of the bed of needles upper top plate 8130. Three battery insertion channel plates 8119 arranged in the front-rear direction are provided between the front vertical plate of the bed of needles and the rear vertical plate of the bed of needles at the lower end of the channel plate mounting bracket 8118. Intermediate support rods 8116 are connected between adjacent battery insertion channel plates 8119. Four groups of battery insertion circuits arranged from front to back are provided inside each of the battery insertion channel plates 8119. Four groups of probe assemblies 8110 arranged from front to back are provided at the bottoms of the battery insertion channel plates 8119. The positions of the probe assemblies 8110 and the battery insertion circuits correspond one by one up and down;

[0037] The probe assembly 8110 includes a temperature needle 8121, a positive electrode probe 8119, and a negative electrode probe 8120 that are vertically downward. A temperature sensor is contained in the temperature needle 8121. The positive electrode probe 8119 includes a positive electrode current needle 8132 and a positive electrode voltage needle 8122. The negative electrode probe 8120 includes a negative electrode current needle 8131 and a negative electrode voltage needle 8123. The positive electrode voltage needle 8122 and the negative electrode voltage needle 8123 extend upward into the battery insertion channel plate 8119. The positive electrode current needle 8132 faces downward directly at the positive electrode tab of the battery 15, and the negative electrode current needle 8123 faces downward directly at the negative electrode tab of the battery 15. The positive electrode voltage needle 8122 and the negative electrode voltage needle 8123 are both connected to a voltage and temperature acquisition connector 8120 through acquisition cables;

[0038] The battery cut-in circuit includes a positive current terminal 8124 and a negative current terminal 8125. The positive current terminal 8124 is connected to a positive probe 8119 through a positive current line 8127, and the negative current terminal 8125 is connected to a negative probe 8120 through a negative current line 8128. At the front end of each battery cut-in channel plate 8119 located at the frontmost side of the pin bed, there is a transfer positive terminal 8126. At the front end of each of the two battery cut-in channel plates 8119 located at the rear side of the pin bed, there is a transfer copper sheet 8129. The transfer copper sheet 8129 connects the negative current terminal at the rearmost end of the previous battery cut-in channel plate to the positive current terminal 8124 at the frontmost end of the subsequent battery cut-in channel plate 8119. The front end of the transfer positive terminal 8126 is connected to a pin bed positive terminal 8111, and at the front side of the lower end of the pin bed outer frame 8113, there is a pin bed negative terminal 8112 led out from the negative current terminal at the rearmost end of the pin bed.

[0039] The driving assembly includes an electrical support 903. At the top of the electrical support 903, there is a control box. Inside the control box, there are a control auxiliary electrical component 904 and a controller 902. The controller 902 and the control auxiliary electrical component 904 are electrically connected to a cylinder 804. At the top of the control box, there is a driving box 901. The driving box 901 includes a driving box body 9011. Inside the driving box body 9011, there are two charge and discharge driving units 9010. At the front end of the charge and discharge driving unit 9010, there are a high-voltage positive connector 9014, a high-voltage negative connector 9015, a driving positive connector 9012, and a driving negative connector 9013. The driving positive connector 9012 of one of the charge and discharge driving units is connected to the pin bed positive terminal 8111 on the sixth pin bed from left to right, and the driving negative connector 9013 of this charge and discharge driving unit 9010 is connected to the pin bed negative terminal 8112 on the first pin bed from left to right. The driving positive connector 9012 of the other charge and discharge driving unit is connected to the pin bed positive terminal 8111 on the twelfth pin bed from left to right, and the driving negative connector 9013 of this charge and discharge driving unit is connected to the pin bed negative terminal 8112 on the seventh pin bed from left to right. The pin bed positive terminals 8111 of the first to fifth pin beds from left to right are connected to the pin bed negative terminals 8112 on the pin beds on the right side of this pin bed through wires. The pin bed positive terminals 8111 of the seventh to eleventh pin beds from left to right are connected to the pin bed negative terminals 8112 on the pin beds on the right side of this pin bed through wires. Both the high-voltage positive connector 9014 and the high-voltage negative connector 9015 are connected to a high-voltage DC power supply.

[0040] In some embodiments, there are twelve rows and twelve columns of a total of 144 batteries 15 loaded on the battery tray 14.

[0041] In some embodiments, the left vertical plate 2 and the mechanism partition 4 are each provided with four hinges 601 from top to bottom. The left vertical plate 2 and the mechanism partition 4 are each connected with a pair of swing doors 6 through hinges. A door handle 603 is provided in the middle of the pair of swing doors 6, and a heat dissipation fan 602 is provided on the pair of swing doors. The two pairs of swing doors 6 can be closed to enclose the left compartment.

[0042] In some embodiments, the right vertical plate 5 is connected with a cabinet door 7 through a hinge 601. The cabinet door 7 can be rotated to close the right compartment. The cabinet door is provided with a hollow iron net 701, a door handle 603, a main power switch 702 and an indicator light 703.

[0043] The working steps of the present utility model include: an external operator turns on the main power switch 702, and the controller 902 controls the cylinder 804 to contract. The cylinder 804 pulls upward until the upper limit rod 805 contacts the mechanism middle frame 802. The battery tray 14 rises with the mechanism middle frame and contacts the battery 15. The charge and discharge drive unit 9010 is connected to the battery 15 to connect the batteries at the bottoms of the first to sixth needle beds 811 from left to right in series, and the batteries at the bottoms of the seventh to twelfth needle beds 811 from left to right in series, and starts to charge and discharge the battery.

[0044] Compared with the prior art, the beneficial effects of the present utility model are as follows: The series charge and discharge method is adopted to supply power to the high-voltage DC bus, so that the charge and discharge currents of the cylindrical lithium-ion batteries are highly consistent, and the capacity consistency in the battery manufacturing process can be improved; The applicable voltage of the series circuit is higher than that of the parallel circuit, reducing the cable heat loss; Without reducing the battery charge and discharge efficiency, the inverter conversion link from direct current to alternating current is eliminated, reducing the number of power devices and energy consumption; The needle bed integrates the probe and the battery cutting channel plate, reducing the mechanism volume, reducing the cable usage amount, and reducing the occupied space of the equipment; The needle bed has a high degree of modularity, small volume and easy operation, reducing the labor intensity of the operator.

Claims

1. A charging and discharging mechanism for a series-connected cylindrical lithium-ion battery, characterized in that: It includes a rectangular bottom plate. Define two opposite sides of the bottom plate as the front side and the rear side, and the other two sides as the left side and the right side. A left vertical plate perpendicular to the bottom plate is provided on the left side of the bottom plate, and a right vertical plate perpendicular to the bottom plate is provided on the right side of the bottom plate. The tops of the left vertical plate and the right vertical plate are connected with a top plate, and the top plate is parallel to the bottom plate. The bottom plate, the left vertical plate, the right vertical plate and the top plate are connected to form a cuboid frame. A vertical partition is connected between the top plate and the bottom plate, and the vertical partition divides the space inside the frame into a left compartment and a right compartment. Two mechanism partitions connecting the left vertical plate and the vertical partition are provided in the left compartment. The mechanism partitions divide the left compartment into three equally high mechanism storage positions in the vertical direction, and a charge-discharge movement mechanism is provided in each mechanism storage position. Two component partitions connecting the right vertical plate and the vertical partition are provided in the right compartment. The component partitions divide the right compartment into three equally high component storage positions in the vertical direction, and a drive component is provided in each component storage position. The charge-discharge movement mechanism includes a mechanism bottom frame. Lower limit blocks are fixed at the left and right ends of the top of the mechanism bottom frame, and a mechanism middle frame is provided on the top of the lower limit blocks. A battery tray is provided in the center of the top of the mechanism middle frame. A number of batteries are carried inside the battery tray. Tray limit blocks fixed on the mechanism middle frame are provided on the left and right sides of the battery tray. Vertical cylinder pull rods are provided at both ends of the mechanism middle frame. Cylinders are provided at the tops of the cylinder pull rods, and the tops of the cylinders are connected with a mechanism top frame. Four vertical guide shafts are passed through the mechanism middle frame. The tops of the guide shafts are connected with the mechanism top frame, and the bottoms of the guide shafts are connected with the mechanism bottom frame. Linear bearings are sleeved on the guide shafts, and the linear bearings are all located at the top of the mechanism middle frame. A needle bed support block is provided at the bottom of the mechanism top frame, and twelve needle beds flush with each other left and right are fixed on the needle bed support block. An upper limit rod is provided vertically at the bottom of the mechanism top frame. The needle bed includes a needle bed outer frame extending forward and backward. The needle bed outer frame includes a needle bed upper top plate connected to the needle bed support block. A needle bed front vertical plate is connected to the front side of the needle bed upper top plate, and a needle bed rear vertical plate is connected to the rear side of the needle bed upper top plate. A channel plate mounting bracket extending forward and backward is connected to the lower end of the needle bed upper top plate. Three battery insertion channel plates arranged front to back are provided between the front vertical plate of the needle bed and the rear vertical plate of the needle bed from the lower end of the channel plate mounting bracket. Intermediate support rods are connected between adjacent battery insertion channel plates. Four groups of battery insertion circuits arranged from front to back are provided inside each of the battery insertion channel plates. Four groups of probe assemblies arranged from front to back are provided at the bottoms of the battery insertion channel plates. The positions of the probe assemblies and the battery insertion circuits correspond one by one up and down. The probe assembly includes a temperature needle, a positive electrode probe and a negative electrode probe vertically downward. A temperature sensor is contained in the temperature needle. The positive electrode probe includes a positive electrode current needle and a positive electrode voltage needle. The negative electrode probe includes a negative electrode current needle and a negative electrode voltage needle. The positive electrode voltage needle and the negative electrode voltage needle extend upward into the battery insertion channel plate. The positive electrode current needle faces downward directly at the positive electrode tab of the battery, and the negative electrode current needle faces downward directly at the negative electrode tab of the battery. The positive electrode voltage needle and the negative electrode voltage needle are both connected with a voltage and temperature acquisition connector through acquisition cables. The battery switching-in circuit includes a positive current terminal and a negative current terminal. The positive current terminal is connected to a positive probe through a positive current wire, and the negative current terminal is connected to a negative probe through a negative current wire. At the front end of each battery switching-in channel plate located at the frontmost side of the bed of needles, there is a transfer positive terminal. At the front end of each of the two battery switching-in channel plates located at the rear side of the bed of needles, there is a transfer copper sheet. The transfer copper sheet connects the negative current terminal at the rearmost end of the previous battery switching-in channel plate to the positive current terminal at the frontmost end of the subsequent battery switching-in channel plate. The front end of the transfer positive terminal is connected to a bed-of-needles positive terminal, and at the front side of the lower end of the outer frame of the bed of needles, there is a bed-of-needles negative terminal led out from the negative current terminal at the rearmost end of the bed of needles. The driving assembly includes an electrical support. At the top of the electrical support, there is a control box. Inside the control box, there are a control auxiliary electrical component and a controller. At the top of the control box, there is a driving box. The driving box includes a driving-box body. Inside the driving-box body, there are two charge-discharge driving units. At the front end of each charge-discharge driving unit, there are a high-voltage positive connector, a high-voltage negative connector, a driving positive connector, and a driving negative connector. The driving positive connector of one of the charge-discharge driving units is connected to the bed-of-needles positive terminal on the sixth bed of needles from left to right, and the driving negative connector of this charge-discharge driving unit is connected to the bed-of-needles negative terminal on the first bed of needles from left to right. The driving positive connector of the other charge-discharge driving unit is connected to the bed-of-needles positive terminal on the twelfth bed of needles from left to right, and the driving negative connector of this charge-discharge driving unit is connected to the bed-of-needles negative terminal on the seventh bed of needles from left to right. The bed-of-needles positive terminals of the first to fifth beds of needles from left to right are connected to the bed-of-needles negative terminals on the beds of needles on the right side of these beds through wires. The bed-of-needles positive terminals of the seventh to eleventh beds of needles from left to right are connected to the bed-of-needles negative terminals on the beds of needles on the right side of these beds through wires. Both the high-voltage positive connector and the high-voltage negative connector are connected to a high-voltage DC power supply.

2. The charging and discharging mechanism of the series-connected cylindrical lithium-ion battery according to claim 1, characterized in that: The battery tray carries batteries arranged in twelve rows and twelve columns.

3. The series-connected cylindrical lithium-ion battery charging and discharging mechanism according to claim 2, characterized in that: Both the left vertical plate and the mechanism partition are provided with four hinges from top to bottom. Both the left vertical plate and the mechanism partition are connected with a pair of double doors through the hinges. In the middle of the double doors, there is a door handle, and on the double doors, there is a cooling fan. The two double doors can be closed to enclose the left compartment.

4. The series-connected cylindrical lithium-ion battery charging and discharging mechanism according to claim 3, characterized in that: The right vertical plate is connected with a cabinet door through a hinge. The cabinet door can be rotated to close the right compartment. On the cabinet door, there are a hollow iron net, a door handle, a main power switch, and an indicator light.

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