Battery cluster maintenance tool

Abstract

The utility model provides a battery cluster maintenance tool. The battery cluster maintenance tool comprises an output positive electrode, an output negative electrode, a first relay, a second relay, a first power supply module, a load and a control switch. The first power supply module comprises a positive electrode and a negative electrode; the positive electrode is electrically connected with the first relay, and the first relay is electrically connected with the output positive electrode; the negative electrode is electrically connected with the output negative electrode. One end of the load is electrically connected with the output cathode, and the other end is electrically connected with the second relay; the second relay is electrically connected with the output positive electrode. The output positive electrode and the output negative electrode are used for being connected with a battery box. The control switch controls the first relay to be closed and the second relay to be disconnected, and the first power module charges the battery box; the control switch controls the first relay to be disconnected, the second relay to be closed and the battery box to discharge. The control switch can also control the first relay and the second relay to be switched off. The tool can improve the maintenance efficiency and reduce the maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of battery cluster technology, and in particular to a battery cluster repair tool. Background Technology

[0002] In existing energy storage battery systems, battery clusters consist of multiple battery boxes. During use, it's inevitable that battery boxes will require maintenance, and replacements are frequent. However, ensuring that the replaced battery box maintains the same voltage and charge as the other battery boxes in the cluster is a pressing problem for the industry. Furthermore, the SOC-OCV of lithium iron phosphate (LFP) cells in energy storage is not as readily apparent as that of ternary lithium batteries. In a static state, the voltage of an LFP cell remains almost constant around 3.3V, making it impossible to determine the approximate SOC (State of Charge) based on the current static voltage value.

[0003] In the repair of existing battery packs, there are generally two ways to balance the charge between the replaced battery pack and other battery packs:

[0004] Method 1: Using charging and discharging equipment, the replacement battery box is adjusted to roughly the same SOC state as the other battery boxes in the battery cluster. Fine-tuning is then performed by the BMS (Battery Management System) through prolonged balancing current. This fine-tuning is typically programmed to only occur when the battery is charging and the voltage difference exceeds a threshold, at which point the BMS will passively discharge. Furthermore, the fine-tuning cycle is very long. For example, with a charge difference of 10Ah, achieving balance using this method would take approximately 33 hours. During this fine-tuning period, the battery cluster cannot discharge normally, and the repair site requires corresponding charging and discharging equipment to adjust the battery box, involving repeated disassembly and reassembly, resulting in low efficiency.

[0005] Method 2: The battery cluster is first discharged to a low SOC state, similar to the cutoff voltage, using a constant current at the same rate. The replacement battery box is then discharged to the cutoff voltage using the same current at the same rate in the module's charging and discharging equipment before being replaced. This method has many drawbacks, such as requiring corresponding charging and discharging equipment on-site to adjust the battery box, the battery cluster not being able to work normally during the maintenance period, wasting the original energy of the battery cluster, and having to discharge the original batteries in the energy storage system. This is difficult to operate in real-world scenarios and wastes a lot of time. Utility Model Content

[0006] The purpose of this utility model is to provide a battery cluster repair tool that improves repair efficiency, greatly reduces repair time, and lowers maintenance costs.

[0007] This utility model provides a battery cluster repair tool, including:

[0008] Output positive terminal, output negative terminal, first relay, second relay, first power supply module, load and control switch;

[0009] The first power module includes a positive electrode and a negative electrode; the positive electrode is electrically connected to the first relay, and the first relay is electrically connected to the output positive terminal; the negative electrode is electrically connected to the output negative terminal.

[0010] One end of the load is electrically connected to the negative output terminal, and the other end is electrically connected to the second relay; the second relay is electrically connected to the positive output terminal.

[0011] The positive output terminal and the negative output terminal are respectively used to connect to the battery box;

[0012] When the control switch is switched to the first state, the first relay is closed and the second relay is open, and the first power module charges the battery box; when the control switch is switched to the second state, the first relay is open and the second relay is closed, and the battery box discharges.

[0013] When the control switch is switched to the third state, the first relay is disconnected and the second relay is disconnected.

[0014] In an optional implementation, a second power module is further included; the second power module is used to supply power to the first relay and the second relay.

[0015] When the control switch is switched to the first state, the second power module and the first relay are electrically connected; when the control switch is switched to the second state, the second power module and the second relay are electrically connected.

[0016] In an optional implementation, an adapter is also included, which is connected to the first power module and the second power module respectively, and the adapter is used to connect to an external power source.

[0017] In an optional embodiment, a connector is also included; one end of the connector is electrically connected to the positive or negative output terminal, and the other end is used to connect to the battery box.

[0018] There are multiple connectors connected to the positive output terminal; there are multiple connectors connected to the negative output terminal.

[0019] In an optional embodiment, the system further includes a housing, in which the positive output terminal, the negative output terminal, the first relay, the second relay, the first power module, and the load are disposed.

[0020] In an optional embodiment, ventilation holes are provided on both opposite side panels of the housing.

[0021] In an optional embodiment, a cooler is provided inside the housing; one side plate with the ventilation holes is provided with mounting holes so that one end of the cooler protrudes outside the housing.

[0022] The load corresponds to the cooler setting.

[0023] In an optional embodiment, an ammeter and a voltmeter are also included, the ammeter and the voltmeter being used to connect to the battery box, respectively.

[0024] And / or, the enclosure is provided with display elements, the display elements including indicator lights and display instruments.

[0025] In an optional embodiment, a power switch is also included, which is used to turn the ammeter, the voltmeter, and the cooler on and off.

[0026] In an optional implementation, a fuse is also included, which is electrically connected to the positive and / or negative output terminals.

[0027] The battery cluster repair tooling provided by this utility model has the following advantages:

[0028] The battery cluster repair fixture provided in this embodiment controls a first relay to energize via a control switch, enabling the first power module to charge the battery box. A second relay is controlled via the same control switch to discharge the battery box. By comparing the charge level of the battery box to be replaced with that of other battery boxes in the cluster, the fixture performs charging or discharging operations on the battery box to be replaced, maintaining a balance between the charge level of the battery box to be replaced and that of the other battery boxes in the cluster, thereby improving repair efficiency. After repairing and replacing the battery box, the battery cluster can be put into immediate use. The fixture allows for rapid online adjustment of the battery box's consistency without affecting the use of the battery cluster, significantly improving repair efficiency and reducing repair time. It also reduces reliance on charging and discharging equipment at the repair site, reducing equipment investment and lowering maintenance costs. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of the battery cluster repair tool provided in this embodiment of the utility model;

[0031] Figure 2A schematic diagram of the internal structure of the battery cluster repair tooling provided in this embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram illustrating the application scenario of the battery cluster repair tooling provided in this embodiment of the utility model.

[0033] Icons: 26-Positive output; 27-Negative output; 23-First relay; 22-Second relay; 24-First power module; 20-Load; 13-Power switch; 14-Control switch; 25-Second power module; 28-Adapter; 15-First connector; 16-Second connector; 1-Housing; 111-First side panel; 112-Second side panel; 113-Top cover; 114-Ventilation hole; 115-Mounting port; 116-Bottom plate; 17-Cooler; 18-Mounting hole; 11-Ammeter; 12-Voltmeter; 117-First indicator light; 118-Second indicator light; 19-External plug; 21-Fuse; 30-Battery cluster; 31-Second battery box; 32-First battery box; 33-Third battery box. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] 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.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] This utility model provides a battery cluster repair tool, which is used to quickly adjust the consistency between the battery box to be replaced or repaired and other battery boxes in the battery cluster when repairing or replacing the battery box in the battery cluster, thereby improving the repair and replacement efficiency and reducing costs.

[0042] Combination Figure 1 and Figure 2The battery pack repair fixture includes a positive output terminal 26, a negative output terminal 27, a first relay 23, a second relay 22, a first power module 24, a load 20, and a control switch 14. The first power module 24 includes a positive electrode and a negative electrode; the positive electrode is electrically connected to the first relay 23, and the first relay 23 is electrically connected to the positive output terminal 26; the negative electrode is electrically connected to the negative output terminal 27. One end of the load 20 is electrically connected to the negative output terminal 27, and the other end is electrically connected to the second relay 22; the second relay 22 is electrically connected to the positive output terminal 26. The positive output terminal 26 and the negative output terminal 27 are respectively used for connection to the battery box.

[0043] The control switch 14 has three positions, or three states. When the control switch 14 is switched to the first state, the first relay 23 is closed and energized, the second relay 22 is open, and the first power module 24 charges the battery box. When the control switch 14 is switched to the second state, the first relay 23 is open, the second relay 22 is closed and energized, and the battery box discharges. When the control switch 14 is switched to the third state, the first relay 23 is open, the second relay 22 is open, and the battery box is in the off mode.

[0044] Optionally, the battery cluster repair fixture also includes a second power module 25; the second power module 25 is used to supply power to the first relay 23 and the second relay 22. When the control switch 14 is switched to the first state, the second power module 25 is electrically connected to the first relay 23; when the control switch 14 is switched to the second state, the second power module 25 and the second relay 22 are electrically connected.

[0045] Optionally, the battery cluster repair fixture also includes an adapter 28, which is connected to the first power module 24 and the second power module 25 respectively. The adapter 28 is used to connect to an external power source. In this embodiment, the adapter 28 is connected to an external plug 19, which is used to connect to an external power source for power. The first power module 24 is a 220V to 200VDC power supply, and the second power module 25 is a 220V to 24VDC power supply. The adapter 28 is connected to AC 220V via the external plug 19. After setting the adapter 28, the first power module 24 and the second power module 25 can both be connected to AC 220V.

[0046] Optionally, the first power module 24 is an adjustable voltage module, which provides an adjustable 200VDC charging voltage to the battery box to meet charging requirements, while effectively preventing damage to the external power supply and load equipment due to abnormal conditions, thus improving the reliability and safety of the system. The first relay 23 is a charging relay, used to control the on / off state of the battery box's charging circuit. The load 20 is a resistor. Optionally, a high-power corrugated resistor can be used, with a power rating of 5kW, for the battery box's power consumption function in discharge mode. The second relay 22 is a discharging relay, used to control the on / off state of the battery box's discharging circuit.

[0047] It should be noted that the power of the first power module 24, the type and power of the load 20, etc. can be flexibly selected according to actual needs, and no specific limitation is made here.

[0048] Optionally, the battery cluster repair tool also includes connectors. One end of the connector is electrically connected to either the positive output terminal 26 or the negative output terminal 27, and the other end is used to connect to the battery box. It can be understood that the connector includes multiple first connectors 15 connected to the positive output terminal 26 and multiple second connectors 16 connected to the negative output terminal 27. The end of the first connector 15 away from the positive output terminal 26 is connected to the battery box, and the end of the second connector 16 away from the negative output terminal 27 is connected to the battery box. The connectors can be flexibly selected according to different battery box models, thus enabling the battery cluster repair tool to adapt to different battery boxes, making it more flexible in application scenarios and improving its adaptability. In this embodiment, the connector uses a quick-connect fitting for easy replacement and installation, improving assembly and disassembly efficiency.

[0049] Optionally, the battery cluster repair fixture also includes a housing 1, with the positive output terminal 26, the negative output terminal 27, the first relay 23, the second relay 22, the first power module 24, and the load 20 disposed inside the housing 1. Ventilation holes 114 are provided on both opposite side panels of the housing 1. A cooler 17 is provided inside the housing 1. One side panel with the ventilation holes 114 has a mounting hole 18, allowing one end of the cooler 17 to protrude outside the housing 1. The cooler 17 may include, but is not limited to, a fan, a refrigerator, or other cooling elements. In this embodiment, the cooler 17 uses a fan; the number and installation position of the fans are not limited and are not specifically restricted here.

[0050] Optionally, the housing 1 includes a top cover 113, a bottom plate 116, two first side plates 111, and two second side plates 112. The top cover 113 and the bottom plate 116 are positioned opposite each other. The two first side plates 111 are positioned opposite each other, and the two second side plates 112 are positioned opposite each other. The top cover 113, the bottom plate 116, the two first side plates 111, and the two second side plates 112 together enclose a cavity. The two first side plates 111 are respectively positioned along the length of the housing 1, and the two second side plates 112 are respectively positioned along the width of the housing 1. Each of the two first side plates 111 has ventilation holes 114, and multiple ventilation holes 114 are evenly distributed on the first side plates 111 to improve cooling uniformity and cooling efficiency.

[0051] The number of ventilation holes 114 on each first side plate 111 is unlimited; there can be one or more. The cross-sectional shape of the ventilation holes 114 can be circular, triangular, quadrilateral, elliptical, pentagonal, hexagonal, crescent-shaped, semi-circular, or any other arbitrary shape. One of the first side plates 111 is also provided with a mounting hole 18 for mounting a fan, so that the fan protrudes from the housing 1 to improve ventilation performance. The fan can dissipate heat from the various electronic components inside the housing 1. Optionally, the load 20 is provided with a corresponding cooler 17 to improve the cooling efficiency of the load 20, resulting in better heat dissipation of the load 20.

[0052] Each of the two second side plates 112 has a mounting port 115 for the connector to pass through. The mounting port 115 facilitates the replacement and connection of the connector. The mounting port 115 has a large opening area, which not only facilitates the installation and removal of the connector, but also promotes ventilation and heat dissipation.

[0053] It should be noted that in some other embodiments, the ventilation hole 114 and the cooler 17 can be designed as either one. That is, only the cooler 17 or only the ventilation hole 114 can be provided; no specific limitation is made here.

[0054] Optionally, the battery pack repair fixture also includes an ammeter 11 and a voltmeter 12, which are respectively used to connect to the battery box. The ammeter 11 is used to detect the current of the battery box, and the voltmeter 12 is used to detect the voltage of the battery box.

[0055] Optionally, the housing 1 is equipped with display elements, including indicator lights and display instruments. The indicator lights are used to determine the switching state of the control switch 14; for example, three states may correspond to three different indicator lights. Alternatively, three states may correspond to three different colors of one indicator light. Alternatively, the indicator lights may indicate the on / off state of the first relay 23 and the second relay 22; for example, there may be two indicator lights, namely the first indicator light 117 and the second indicator light 118. When the first relay 23 is energized, the first indicator light 117 lights up, and the second indicator light 118 is off, indicating that the battery box is in charging mode, and the control switch 14 is in the first state. When the second relay 22 is energized, the second indicator light 118 lights up, and the first indicator light 117 is off, indicating that the battery box is in discharging mode, and the control switch 14 is in the second state. If both the first indicator light 117 and the second indicator light 118 are off, it indicates that both the first relay 23 and the second relay 22 are off, and the control switch 14 is in the third state.

[0056] The display instruments include, but are not limited to, digital displays, which can display the current and voltage of the battery box, as well as the actual temperature or other parameters inside the box 1, etc., without specific limitations. Of course, in some embodiments, parameters such as current and voltage can also be displayed on ammeter 11 and voltmeter 12, without specific limitations.

[0057] Optionally, the battery cluster repair fixture also includes a fuse 21, which is electrically connected to the positive output terminal 26 and / or the negative output terminal 27. The fuse 21 protects the charging and discharging circuits. In this embodiment, the fuse 21 is positioned between the positive output terminal 26 and the second relay 22, which allows for rapid circuit disconnection and improves the safety of the fixture during use.

[0058] In this embodiment, a power switch 13 is also provided on the housing 1. Optionally, the power switch 13 is located on the upper cover 113 of the housing 1 for easy operation. The power switch 13 is also used for the current on / off control of the ammeter 11, voltmeter 12 and cooler 17, that is, for controlling the opening and closing of the ammeter 11, voltmeter 12 and cooler 17.

[0059] The circuit connection method and working principle of this battery cluster repair tool are as follows:

[0060] The negative output terminal 27 is connected via cables to one end of the load 20 and the negative terminal of the first power module 24. The positive output terminal 26 is connected via cables to the positive terminals of the coils of the second relay 22 and the first relay 23. The negative terminals of the coils of the second relay 22 and the first relay 23 are connected to the negative terminal of the adapter 28. The positive terminals of the coils of the first relay 23 and the second relay 22 are connected to the control switch 14.

[0061] The positive output terminal 26 inside the housing 1 is connected to the first connector 15 as the positive output, and the negative output terminal 27 is connected to the second connector 16 as the negative output. The second power module 25 is used to supply power to the cooler 17, the first relay 23, the second relay 22, the indicator light, the voltmeter 12, and the ammeter 11.

[0062] Control switch 14 is a three-position rotary switch; rotating it to the middle position puts it in the normally open state. Rotating control switch 14 to the right closes the positive terminal of the first relay 23, illuminating the first indicator light 117. This connects the battery box and the first power module 24, which then begins charging the battery box. The first power module 24 has an adjustable voltage and its current is mostly between 5A and 10A, which is not the same level of balancing current as the 300mA balancing current of the battery management system (BMS). If the battery box has a high capacity, multiple first power modules 24 can be connected in parallel for charging to reduce balancing time, or an adjustable first power module 24 can be used, allowing selection of different charging levels such as 5A or 10A according to actual needs.

[0063] Rotating control switch 14 to the left closes the positive circuit of the second relay 22, illuminating the second indicator light 118; simultaneously, it disconnects the first relay 23. The positive and negative terminals of the battery box are connected to a high-power corrugated resistor, initiating discharge. To increase discharge power, multiple high-power corrugated resistors or other loads 20 can be added within the fixture.

[0064] Since the housing 1 contains resistors, a first power module 24, and a second power module 25, this embodiment uses ventilation holes 114 on the first side plate 111 and a fan for heat dissipation. The second end plate has a large mounting opening 115, which facilitates connector installation and also aids in heat dissipation. The positive output terminal 26 and the negative output terminal 27 use copper busbars for easy connector replacement. The connectors are quick-release connectors, making connection and replacement simple and convenient, and adaptable to different battery box models.

[0065] Combination Figure 3 The battery cluster repair tool is applied to battery cluster 30. The replaced battery box is the first battery box 32. The original battery boxes in the two battery clusters 30 adjacent to the first battery box 32 are the second battery box 31 and the third battery box 33. The battery cluster repair tool includes two first connectors 15 and two second connectors 16. One first connector 15 is connected to the positive terminal of the first battery box 32, and the other first connector 15 is connected to the negative terminal of the third battery box 33. One second connector 16 is connected to the positive terminal of the second battery box 31, and the other second connector 16 is connected to the negative terminal of the first battery box 32, completing the power connection.

[0066] When power switch 13 is closed, voltmeter 12, ammeter 11, and fan are powered on and begin operation. Voltmeter 12 displays the output voltage of the first battery box 32 in real time. The computer monitors the voltage of each battery box in the battery cluster 30 during operation after the first battery box 32 is replaced. If the voltage of the replaced first battery box 32 is lower than the voltage of any battery box in the battery cluster 30, the control switch 14 is manually adjusted to the first state, and the first relay 23 closes to charge the first battery box 32. If the voltage of the replaced first battery box 32 is higher than the voltage of any battery box in the battery cluster 30, the control switch 14 is manually adjusted to the second state, and the second relay 22 closes to discharge the first battery box 32 until its voltage balances with the other battery boxes. Then, the control switch 14 is manually adjusted to the third state.

[0067] In summary, the battery cluster repair fixture provided by this utility model embodiment has the following beneficial effects, including:

[0068] This battery cluster repair fixture reduces reliance on charging and discharging equipment at the repair site, thereby reducing equipment investment and maintenance costs. The fixture features a simple and low-cost design, requiring no complex control logic, and can achieve manual and automatic switching between three states: charging, discharging, and disconnected. Furthermore, after replacing the battery box, the battery cluster 30 can be immediately put into use, with online rapid adjustment of the battery box's consistency state without affecting the use of the battery cluster 30, significantly improving repair efficiency and shortening the repair cycle. The fixture is easy to use and operate, eliminating the need for pre-adjustment of the battery cluster 30's original state, reducing or increasing its original charge, avoiding power waste, and lowering repair costs.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of this utility model.

Claims

1. A battery cluster service tool, characterized by, include: Output positive terminal (26), output negative terminal (27), first relay (23), second relay (22), first power supply module (24), load (20) and control switch (14); The first power module (24) includes a positive electrode and a negative electrode; the positive electrode is electrically connected to the first relay (23), the first relay (23) is electrically connected to the output positive terminal (26); the negative electrode is electrically connected to the output negative terminal (27); One end of the load (20) is electrically connected to the negative output terminal (27), and the other end is electrically connected to the second relay (22); the second relay (22) is electrically connected to the positive output terminal (26); The positive output terminal (26) and the negative output terminal (27) are respectively used to connect to the battery box; When the control switch (14) is switched to the first state, the first relay (23) is closed and the second relay (22) is open, and the first power module (24) charges the battery box; when the control switch (14) is switched to the second state, the first relay (23) is open and the second relay (22) is closed, and the battery box discharges. When the control switch (14) is switched to the third state, the first relay (23) is disconnected and the second relay (22) is disconnected.

2. The battery cluster service tool of claim 1, wherein, It also includes a second power module (25); the second power module (25) is used to supply power to the first relay (23) and the second relay (22); When the control switch (14) is switched to the first state, the second power module (25) is electrically connected to the first relay (23); when the control switch (14) is switched to the second state, the second power module (25) and the second relay (22) are electrically connected.

3. The battery cluster service tool of claim 2, wherein, It also includes an adapter (28) which is connected to the first power module (24) and the second power module (25) respectively, and the adapter (28) is used to connect to an external power source.

4. The battery pack service tool of claim 1, wherein, It also includes a connector; one end of the connector is electrically connected to the positive output terminal (26) or the negative output terminal (27), and the other end is used to connect to the battery box; The number of connectors connected to the positive output terminal (26) is multiple; the number of connectors connected to the negative output terminal (27) is multiple.

5. The battery pack service tool of claim 1, wherein, It also includes a housing (1), and the positive output terminal (26), the negative output terminal (27), the first relay (23), the second relay (22), the first power module (24) and the load (20) are disposed inside the housing (1).

6. The battery cluster service tool of claim 5, wherein, Ventilation holes (114) are provided on both opposite side panels of the box (1).

7. The battery cluster service tool of claim 6, wherein, The housing (1) is equipped with a cooler (17); one side plate with the ventilation hole (114) is provided with a mounting hole (18) so that one end of the cooler (17) protrudes outside the housing (1); The load (20) is configured to correspond to the cooler (17).

8. The battery cluster service tool of claim 7, wherein, It also includes an ammeter (11) and a voltmeter (12), which are used to connect to the battery box, respectively; And / or, the housing (1) is provided with display elements, the display elements including indicator lights and display instruments.

9. The battery cluster service tool of claim 8, wherein, It also includes a power switch (13) for turning the ammeter (11), the voltmeter (12) and the cooler (17) on and off.

10. The battery string service tool of any one of claims 1 to 9, wherein, It also includes a fuse (21) electrically connected to the positive output terminal (26) and / or the negative output terminal (27).

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