Short circuit detection device, short circuit detection system, and short circuit detection method

Abstract

The invention discloses a short circuit detection device, a short circuit detection system and a short circuit detection method. The short circuit detection device comprises a control module, a resistance detection device, a first wiring pair connected with the resistance detection device, a second wiring pair used for being connected with a shell of a to-be-detected battery, and a plurality of wiring groups used for being connected with a power supply interface of the to-be-detected battery. Each connecting wire in the first connecting wire pair, the second connecting wire pair and the connecting wire group is provided with a switch; the first wiring pair, the second wiring pair and each wiring group are mutually connected; the control module is respectively connected with the resistance detection device and each switch; the control module is used for controlling on and off of the switches to form a short circuit detection circuit between the shell and the power supply interface. According to the short-circuit detection device, the short-circuit detection circuit between the shell and the power supply interface can be formed by controlling opening and closing of the switches, whether the power supply interface short-circuited with the shell exists in the multiple power supply interfaces of the battery or not can be tested at the same time, and the short-circuit test efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to a short-circuit detection device, a short-circuit detection system, and a short-circuit detection method. Background Art

[0002] With the development of new energy technologies, batteries, especially power batteries, have been increasingly widely used in various technical fields. A battery is a general term, which can refer to a battery pack. A battery pack is an integrated unit assembled from multiple battery modules or multiple battery cells, and is used to store and provide electrical energy. There is a certain probability of a short circuit between the external power supply interface of the battery and the battery housing. When there is a short circuit between the external power supply interface and the housing, the battery is likely to be damaged or even catch fire. Therefore, it is necessary to detect whether there is a short circuit between the battery housing and the external power supply interface of the battery, so as to reduce the probability of battery damage or battery short-circuit fire caused by the short circuit between the housing and the external power supply interface during battery use. In the related art, the detection of the short-circuit condition between each power supply interface of the battery under test and the housing of the battery under test is carried out one by one, and the detection efficiency is low. With the development of battery technology, the number of high-voltage relays in the battery pack is increasing. According to the method of sequentially performing short-circuit tests on the housing of the battery under test and each power supply interface in the related art, the test rate is low and cannot meet the test beat requirements of the end-of-life test of the battery.

[0003] The above statements are only used to provide background technical information related to this application, and do not necessarily constitute prior art. Summary of the Invention

[0004] In view of the problem that the test rate of the method of sequentially performing short-circuit tests on the housing of the battery under test and each power supply interface in the above related art is low and cannot meet the test beat of the existing end-of-life test of the battery, this application provides a short-circuit detection device, a short-circuit detection system, and a short-circuit detection method, which can simultaneously test whether there is a power supply interface that is short-circuited with the housing of the battery under test among multiple power supply interfaces of the battery under test, improve the short-circuit test efficiency, and meet the test beat requirements of the end-of-life test of the battery.

[0005] In the first aspect of the embodiments of this application, a short-circuit detection device is provided, including a control module, a resistance detection device, a first wiring pair connecting the resistance detection device, a second wiring pair for connecting the housing of the battery under test, and multiple wiring groups for connecting the power supply interfaces of the battery under test; switches are provided on each wire of the first wiring pair, the second wiring pair, and the wiring groups; the first wiring pair, the second wiring pair, and each wiring group are connected to each other;

[0006] The control module is respectively connected to the resistance detection device and each switch;

[0007] The control module is configured to control the opening and closing of each of the switches to form a short - circuit detection circuit between the housing and the power supply interface.

[0008] The short - circuit detection device according to the embodiment of the present application can form a short - circuit detection circuit between the housing and the power supply interface by controlling the opening and closing of each switch, so as to be able to simultaneously test whether there is a power supply interface that is short - circuited with the housing of the battery under test among multiple power supply interfaces of the battery under test, improve the short - circuit test efficiency, and meet the test beat requirements of the end - of - life cycle test of the battery.

[0009] In some embodiments of the present application, the short - circuit detection device further includes a positive bus bar and a negative bus bar. Each of the first wiring pair and the second wiring pair includes a positive wiring connecting the positive bus bar and a negative wiring connecting the negative bus bar. The wiring group includes two positive wirings connecting the positive bus bar and two negative wirings connecting the negative bus bar.

[0010] The mutual connection between the first wiring pair, the second wiring pair and each wiring group is realized through the positive bus bar and the negative bus bar, which can simplify the circuit wiring structure, facilitate wiring, and save the space occupied by the circuit lines.

[0011] In some embodiments of the present application, the wiring group includes a first positive wiring, a second positive wiring, a first negative wiring, a second negative wiring, a first wiring terminal and a second wiring terminal. The first positive wiring and the first negative wiring are both connected to the first wiring terminal, and the second positive wiring and the second negative wiring are both connected to the second wiring terminal. The first wiring terminal is used to connect the positive interface of the power supply interface, and the second wiring terminal is used to connect the negative interface of the power supply interface. In this way, it is possible to more conveniently realize the connection between the two positive wirings and the two negative wirings of the wiring group and the power supply interface, and different connection - mode short - circuit detection circuits can be formed between the housing and the power supply interface by selectively controlling the opening and closing of the switches on each wiring in the wiring group.

[0012] In the second aspect of the embodiment of the present application, a short - circuit detection system is provided, including the short - circuit detection device according to any embodiment of the present application and a battery under test. The second wiring pair is connected to the housing of the battery under test, and the wiring group is connected to the power supply interface of the battery under test.

[0013] The short - circuit detection system according to the embodiment of the present application can form a short - circuit detection circuit between the housing and the power supply interface of the battery under test by controlling the opening and closing of each switch, so as to be able to simultaneously test whether there is a power supply interface that is short - circuited with the housing of the battery under test among multiple power supply interfaces of the battery under test, improve the short - circuit test efficiency, and meet the test beat requirements of the end - of - life cycle test of the battery.

[0014] In the third aspect of the embodiments of the present application, a short - circuit detection method is provided, which is applied to the short - circuit detection system in the second aspect; the detection method includes:

[0015] Control the line between the outer shell of the battery under test and the resistance detection device to be conductive;

[0016] Control the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device to be conductive, where the target electrode includes any electrode between the positive electrode and the negative electrode;

[0017] Based on the resistance between the outer shell and the power supply interface measured by the resistance detection device, determine whether there is a short - circuit between the outer shell and the power supply interface; in this way, it is possible to simultaneously test whether there is a power supply interface that is short - circuited with the outer shell of the battery under test among multiple power supply interfaces of the battery under test, improve the short - circuit test efficiency, and meet the test beat requirements of the end - of - life cycle test of the battery.

[0018] In some embodiments of the present application, the wiring group includes a first positive - pole wiring, a second positive - pole wiring, a first negative - pole wiring, a second negative - pole wiring, a first wiring terminal, and a second wiring terminal. The first positive - pole wiring and the first negative - pole wiring are both connected to the first wiring terminal, and the second positive - pole wiring and the second negative - pole wiring are both connected to the second wiring terminal; the first wiring terminal is used to connect the positive - pole interface of the power supply interface, and the second wiring terminal is used to connect the negative - pole interface of the power supply interface; the control of the line between the outer shell of the battery under test and the resistance detection device to be conductive includes:

[0019] Control the switches on the negative - pole wiring in the first wiring pair and the switches on the negative - pole wiring in the second wiring pair to be closed, so that the outer shell of the battery under test is conductive with the negative pole of the resistance detection device, facilitating the subsequent formation of a test circuit for testing the resistance between the outer shell of the battery under test and each power supply interface.

[0020] In some embodiments of the present application, the control of the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device includes one of the following:

[0021] Control the switches on the positive - pole wiring in the first wiring pair and the switches on the first positive - pole wiring in each wiring group to be closed, so as to form a test circuit for testing the short - circuit between the outer shell of the battery under test and the positive - pole interfaces of each power supply interface, and test whether there is a short - circuit between the outer shell of the battery under test and the positive - pole interfaces of each power supply interface;

[0022] Close the switches on the positive wire of the first wiring pair and the switches on the second positive wires of each of the wiring groups, thereby forming a test circuit for testing between the housing of the battery under test and the negative interfaces of each power supply interface to test whether there is a short circuit between the housing of the battery under test and the negative interfaces of each power supply interface.

[0023] In some embodiments of the present application, the wiring group includes a first positive wire, a second positive wire, a first negative wire, a second negative wire, a first terminal and a second terminal. The first positive wire and the first negative wire are both connected to the first terminal, and the second positive wire and the second negative wire are both connected to the second terminal; the first terminal is used to connect the positive interface of the power supply interface, and the second terminal is used to connect the negative interface of the power supply interface; the control to make the line between the housing of the battery under test and the resistance detection device conductive includes:

[0024] Close the switches on the positive wire of the first wiring pair and the switches on the positive wire of the second wiring pair, thereby making the housing of the battery under test conductive with the positive pole of the resistance detection device, so as to form a test circuit for testing the resistance between the housing of the battery under test and each power supply interface subsequently.

[0025] In some embodiments of the present application, the control to make the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device conductive includes one of the following:

[0026] Close the switches on the negative wire of the first wiring pair and the switches on the first negative wires of each of the wiring groups, thereby forming a test circuit for testing between the housing of the battery under test and the positive interfaces of each power supply interface to test whether there is a short circuit between the housing of the battery under test and the positive interfaces of each power supply interface;

[0027] Close the switches on the negative wire of the first wiring pair and the switches on the second negative wires of each of the wiring groups, thereby forming a test circuit for testing between the housing of the battery under test and the negative interfaces of each power supply interface to test whether there is a short circuit between the housing of the battery under test and the negative interfaces of each power supply interface.

[0028] In some embodiments of the present application, the determination of whether there is a short circuit between the housing and the power supply interface based on the resistance between the housing and the power supply interface measured by the resistance detection device includes:

[0029] Judge that there is a short circuit between the housing and the target electrode according to the resistance between the housing and the target electrode measured by the resistance detection device being less than or equal to a first preset resistance value;

[0030] Based on the fact that the resistance between the outer casing and the target electrode measured by the resistance detection device is greater than a second preset resistance value, it is determined that there is no short circuit between the outer casing and the target electrode; the second preset resistance value is greater than or equal to the first preset resistance value.

[0031] By comparing the measured resistance between the outer casing and the target electrode with the first preset resistance value and the second preset resistance value to determine whether there is a short circuit, the steps are relatively simple, and the short-circuit detection efficiency can be further improved.

[0032] The above description is only an overview of the technical solution of the embodiments of the present application. In order to be able to understand the technical means of the embodiments of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the embodiments of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Brief Description of the Drawings

[0033] By reading the detailed description of the following embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the embodiments of the present application and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components.

[0034] Figure 1 It is a schematic structural diagram of a short-circuit detection device according to one or more embodiments.

[0035] Figure 2 It is a schematic structural diagram of a short-circuit detection device according to one or more embodiments.

[0036] Figure 3 It is a schematic structural diagram of a wiring group according to one or more embodiments.

[0037] Figure 4 It is a schematic structural diagram of a short-circuit detection device according to one or more embodiments.

[0038] Figure 5 It is a schematic structural diagram of a short-circuit detection system according to one or more embodiments.

[0039] Figure 6 It is a flowchart of a short-circuit detection method according to one or more embodiments.

[0040] Figure 7 It is a flowchart for determining whether there is a short circuit between the outer casing and the power supply interface based on the resistance between the outer casing and the power supply interface measured by the resistance detection device according to one or more embodiments. Detailed Embodiments

[0041] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and above drawings of this application are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "multiple" means more than two (including two). Similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0046] Batteries, especially power batteries, have the advantages of high power, high energy density, good environmental protection effect, etc., and have been widely used in technical fields such as new energy vehicles, consumer electronics, energy storage systems, etc. Power batteries can be used in, but are not limited to, electrical devices such as vehicles, ships or aircrafts. Taking electric vehicles as an example, electric vehicles powered by power batteries have the advantages of good environmental protection effect, low noise, low cost, and can effectively promote energy conservation and emission reduction, and have great market application prospects, which is conducive to the sustainable development of the economy.

[0047] A battery is a general term and can refer to a battery pack. A battery pack generally includes multiple battery modules, and a battery module includes multiple battery cells. The battery pack has multiple power supply interface pairs, and each power supply interface pair includes a positive interface and a negative interface.

[0048] There is a certain probability of a short circuit between the external power supply interface of the battery and the battery housing. If there is a short circuit between the external power supply interface of the battery and the housing, the battery is likely to be damaged or even catch fire when in use. Therefore, it is necessary to detect whether there is a short circuit between the battery housing and the external power supply interface of the battery to reduce the probability of battery damage or battery short circuit and fire when the battery is in use due to the short circuit between the housing and the external power supply interface.

[0049] In the related art, the detection of the short circuit condition between each power supply interface of the battery under test and the housing of the battery under test is carried out one by one. After detecting that one power supply interface and the housing are not short-circuited, then the next power supply interface is detected to see if it is short-circuited with the housing. Since the number of power supply interfaces is large, the efficiency of sequential single detection is low. However, with the development of battery technology, the number of external power supply interfaces of the battery pack is increasing. According to the method of sequentially testing the short circuit between the housing of the battery under test and each power supply interface in the related art, the testing rate is low and cannot meet the testing beat requirements of the end-of-life cycle test of the battery.

[0050] Therefore, simultaneously detecting whether there is a short circuit between each power supply interface of the battery and the housing is a solution to the technical problems existing in the related art. In view of the technical problems existing in the related art, an embodiment of the present application provides a short circuit detection device, including a control module, a resistance detection device, a first wiring pair connecting the resistance detection device, a second wiring pair for connecting the housing of the battery under test, and a plurality of wiring groups for connecting the power supply interfaces of the battery under test. Switches are provided on each wire of the first wiring pair, the second wiring pair, and the wiring groups. The first wiring pair, the second wiring pair, and the wiring groups are connected to each other. The control module is respectively connected to the resistance detection device and each of the switches. The control module is used to control the opening and closing of each of the switches to form a short circuit detection circuit between the housing and the power supply interface. The short circuit detection device of the embodiment of the present application can control the opening and closing of each switch through the control module to form a short circuit detection circuit between the housing and the power supply interface, so as to be able to simultaneously test whether there is a power supply interface that is short-circuited with the housing of the battery under test among multiple power supply interfaces of the battery under test, improve the short circuit test efficiency, and meet the testing beat requirements of the end-of-life cycle test of the battery.

[0051] The following describes a short circuit detection device proposed according to an embodiment of the present application with reference to the accompanying drawings.

[0052] Reference Figure 1As shown in the figure, an embodiment of the present application provides a short - circuit detection device, which includes a control module, a resistance detection device, a first wiring pair 10 connecting the resistance detection device, a second wiring pair 20 for connecting to the outer shell of the battery under test, and a plurality of wiring groups 30 for connecting to the power supply interface of the battery under test; a switch K is provided on each wire of the first wiring pair 10, the second wiring pair 20 and the wiring groups 30; the first wiring pair 10, the second wiring pair 20 and the wiring groups 30 are connected to each other; the control module is respectively connected to the resistance detection device and each switch K; the control module is used to control the opening and closing of each switch K to form a short - circuit detection circuit between the outer shell and the power supply interface.

[0053] The control module may include a microcontroller or a microprocessor, for example, it may be a single - chip microcomputer or an ARM processor. The resistance detection device may be, for example, a multimeter or other devices for detecting resistance. The first wiring pair 10 includes two wires, one of which is connected to the positive pole of the resistance detection device, and the other is connected to the negative pole of the resistance detection device. The second wiring pair 20 includes two wires, one of the wires in the second wiring pair 20 is connected to the outer shell and the positive pole of the resistance detection device, and the other wire in the second wiring pair 20 is connected to the outer shell and the negative pole of the resistance detection device. The battery under test has multiple power supply interface pairs, each power supply interface pair includes two power supply interfaces, and the two power supply interfaces include a positive - pole interface and a negative - pole interface. The wires in the wiring group 30 are connected to the power supply interface, the resistance detection device and the outer shell of the battery under test. A switch K is provided on each wire, and the conduction of the wire where it is located is realized by the opening or closing of the switch.

[0054] By controlling the opening and closing of each switch K, the control module can realize the conduction or disconnection of the corresponding wire, and can form short - circuit detection circuits with various structures between the outer shell and the power supply interface. There is no need to change the wiring in the short - circuit detection device. Only by selectively opening and closing the switches on each wire can different - structure short - circuit detection circuits be realized, which is convenient to operate; moreover, in the short - circuit detection circuit between the outer shell and the power supply interface, multiple power supply interfaces can be connected to the resistance detection device and the outer shell of the battery under test at the same time, so that it is possible to simultaneously test whether there is a short - circuit between multiple power supply interfaces and the outer shell, improving the short - circuit detection efficiency.

[0055] Reference Figure 2 As shown in the figure, in some embodiments, the short - circuit detection device further includes a positive - pole bus P and a negative - pole bus N. Each wiring pair in the first wiring pair 10 and the second wiring pair 20 includes a positive - pole wire connected to the positive - pole bus P and a negative - pole wire connected to the negative - pole bus N. The wiring group 30 includes two positive - pole wires connected to the positive - pole bus P and two negative - pole wires connected to the negative - pole bus N.

[0056] The interconnection between the first wiring pair 10, the second wiring pair 20 and each wiring group 30 is realized through the positive busbar P and the negative busbar N, which can simplify the circuit wiring structure, facilitate wiring, and save the space occupied by the circuit lines.

[0057] Reference Figure 3 As shown, in some embodiments, the wiring group 30 includes a first positive wiring 31, a second positive wiring 32, a first negative wiring 33, a second negative wiring 34, a first wiring terminal 35 and a second wiring terminal 36. Both the first positive wiring 31 and the first negative wiring 33 are connected to the first wiring terminal 35, and both the second positive wiring 32 and the second negative wiring 34 are connected to the second wiring terminal 36. The first wiring terminal 35 is used to connect the positive interface of the power supply interface, and the second wiring terminal 36 is used to connect the negative interface of the power supply interface. In this way, it is possible to more conveniently connect the two positive wirings and the two negative wirings of the wiring group to the power supply interface, and different connection mode short-circuit detection circuits can be formed between the housing and the power supply interface by selectively controlling the opening and closing of the switches K on each wiring in the wiring group 30.

[0058] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities can be referred to each other. For the sake of brevity, they will not be elaborated herein.

[0059] Reference Figure 4 As shown, a specific example of a short-circuit detection device includes a control module, a resistance detection device, a positive busbar P, a negative busbar N, a first wiring pair connecting the resistance detection device, a second wiring pair for connecting the housing of the battery under test, and a plurality of wiring groups for connecting the power supply interface of the battery under test. The plurality of wiring groups are respectively wiring group 1, wiring group 2,..., wiring group n.

[0060] The first wiring pair includes a first positive wiring L1 and a first negative wiring L2; the second wiring pair includes a second positive wiring L3 and a second negative wiring L4. The first end of the first positive wiring L1 in the first wiring pair is connected to the positive electrode of the resistance detection device, the first end of the second positive wiring L3 in the second wiring pair is used to connect to the outer casing of the battery under test, the first end of the first negative wiring L2 in the first wiring pair is connected to the negative electrode of the resistance detection device, and the first end of the second negative wiring L4 in the second wiring pair is used to connect to the outer casing of the battery under test. The second ends of the first positive wiring L1 in the first wiring pair and the second end of the second positive wiring L3 in the second wiring pair are both connected to the positive busbar P, while the second ends of the first negative wiring L2 in the first wiring pair and the second end of the second negative wiring L4 in the second wiring pair are both connected to the negative busbar N. A switch K1 is provided on the first positive wiring L1, and a switch K3 is provided on the second positive wiring L3; a switch K2 is provided on the first negative wiring L2, and a switch K4 is provided on the second negative wiring L4. The switch K1 , the switch K3 , the switch K2 and the switch K4 are all connected to the control module and are opened or closed under the control of the control module.

[0061] Wiring group 1 includes a first positive wiring L P11 , Second positive electrode connection L P12 , first negative electrode connection L N11 , Second negative terminal L N12 , the first connection terminal P1 and the second connection terminal N1, the first positive connection L P11 The first end and the first negative electrode connection L N11 The first end is connected to the first terminal P1, the second positive terminal L P12 The first end and the second negative terminal L N12 The first end of each is connected to the second terminal N1, the first positive terminal L P11 The second end and the second positive electrode are connected to L P12 The second end of each is connected to the positive bus P, the first negative connection L N11 The second end and the second negative electrode are connected to L N12 The second end of each is connected to the negative bus N. The wiring group 2 includes a first positive wiring L P21 , Second positive electrode connection L P22 , first negative electrode connection L N21 , Second negative terminal L N22 , the first terminal P2 and the second terminal N2, the first positive terminal L P21 The first end and the first negative electrode connection L N21 The first end is connected to the first terminal P2, the second positive terminal L P22 The first end and the second negative terminal L N22 The first end of each is connected to the second terminal N2, and the first positive terminal LP21 The second end and the second positive electrode connection wire L P22 The second ends of both are connected to the positive electrode busbar P, and the first negative electrode connection wire L N21 The second end and the second negative electrode connection wire L N22 The second ends of both are connected to the negative electrode busbar N. …… The wiring group n includes the first positive electrode connection wire L Pn(2n-1) , the second positive electrode connection wire L Pn(2n) , the first negative electrode connection wire L Nn(2n-1) , the second negative electrode connection wire L Nn(2n) , the first terminal P n and the second terminal N n , the first end of the first positive electrode connection wire L Pn(2n-1) and the first end of the first negative electrode connection wire L Nn(2n-1) are both connected to the first terminal P n , the first end of the second positive electrode connection wire L Pn(2n) and the first end of the second negative electrode connection wire L Nn(2n) are both connected to the second terminal N n . The second end of the first positive electrode connection wire L Pn(2n-1) and the second end of the second positive electrode connection wire L Pn(2n) are both connected to the positive electrode busbar P, and the first end of the first negative electrode connection wire L Nn(2n-1) and the second end of the second negative electrode connection wire L Nn(2n) are both connected to the negative electrode busbar N.

[0062] The first terminal P1 in the wiring group 1 is used to connect the positive electrode interface in the first power supply interface pair of the battery pack, and the second terminal N1 in the wiring group 1 is used to connect the negative electrode interface in the first power supply interface pair; the first terminal P2 in the wiring group 2 is used to connect the positive electrode interface in the second power supply interface pair of the battery pack, and the second terminal N1 in the wiring group 2 is used to connect the negative electrode interface in the second power supply interface pair; …… The first terminal P n in the wiring group n is used to connect the positive electrode interface in the nth power supply interface pair of the battery pack, and the second terminal N n in the wiring group n is used to connect the negative electrode interface in the nth power supply interface pair of the battery pack.

[0063] A switch is provided on each wire in each wiring group. Specifically, in the wiring group 1, a switch K P11 is provided on the first positive electrode connection wire L A1 , a switch K P12 is provided on the second positive electrode connection wire L A2 , a switch K N11 is provided on the first negative electrode connection wire L B1 , a switch K N12 is provided on the second negative electrode connection wire L B2 . In the wiring group 2, the first positive electrode connection wire LP21 is provided with a switch K A3 , the second positive terminal wiring L P22 is provided with a switch K B3 , the first negative terminal wiring L N21 is provided with a switch K B3 , the second negative terminal wiring L N22 is provided with a switch K B4 . In the wiring group n, the first positive terminal wiring L Pn(2n-1) is provided with a switch K A(2n-1) , the second positive terminal wiring L Pn(2n) is provided with a switch K A(2n) , the first negative terminal wiring L Nn(2n-1) is provided with a switch K B(2n) , the second negative terminal wiring L Nn(2n) is provided with a switch K B(2n-1) . The switch K A1 , the switch K A2 , the switch K B1 , the switch K B2 . The switch K A3 , the switch K B3 , the switch K B3 , the switch K B4 , ……, the switch K A(2n-1) , the switch K A(2n) , the switch K B(2n) and the switch K B(2n-1) are all connected to the control module and are controlled by the control module to be opened or closed.

[0064] In some examples, the switch K1 and the switch K2 can be interlocked, and the switch K3 and the switch K4 can be interlocked; the switch K A1 and the switch K A2 can be interlocked, and the switch K B1 and the switch K B2 can be interlocked… the switch K A(2n-1) and the switch K A(2n) can be interlocked, and the switch K B(2n-1) and the switch K B(2n) can be interlocked. The switch on the first positive terminal wiring and the switch on the second positive terminal wiring in the same wiring group are interlocked, and the switch on the first negative terminal wiring and the switch on the second negative terminal wiring in the same wiring group are interlocked. By interlocking between two switches, the function of only being able to open or close one of the switches simultaneously can be achieved.

[0065] Reference Figure 5As shown in the figure, another embodiment of the present application provides a short - circuit detection system, including the short - circuit detection device of any embodiment of the present application and the battery under test. The second wiring pair is connected to the outer shell 51 of the battery under test, and the wiring group is connected to the power supply interface 52 of the battery under test. The short - circuit detection device includes a plurality of wiring groups. The battery under test includes an outer shell 51 and a plurality of power supply interfaces 52. Two wiring terminals of one wiring group are respectively connected to one power supply interface 52 in the same power supply interface pair.

[0066] The short - circuit detection system of the embodiment of the present application can form a short - circuit detection circuit between the outer shell of the battery under test and the power supply interface by controlling the opening and closing of each switch, so as to be able to simultaneously test whether there is a power supply interface that is short - circuited with the outer shell of the battery under test among the plurality of power supply interfaces of the battery under test, improve the short - circuit test efficiency, and meet the test beat requirements of the end - of - life cycle test of the battery.

[0067] Reference Figure 6 As shown in the figure, another embodiment of the present application provides a short - circuit detection method, which is applied to the short - circuit detection system of any embodiment of the present application; the detection method may include:

[0068] S10: Control the line between the outer shell of the battery under test and the resistance detection device to be conductive.

[0069] In some embodiments, the wiring group includes a first positive - pole wiring, a second positive - pole wiring, a first negative - pole wiring, a second negative - pole wiring, a first wiring terminal, and a second wiring terminal. The first positive - pole wiring and the first negative - pole wiring are both connected to the first wiring terminal, and the second positive - pole wiring and the second negative - pole wiring are both connected to the second wiring terminal; the first wiring terminal is used to connect the positive - pole interface of the power supply interface, and the second wiring terminal is used to connect the negative - pole interface of the power supply interface.

[0070] Exemplarily, controlling the line between the outer shell of the battery under test and the resistance detection device to be conductive may include: controlling the switches on the negative - pole wirings in the first wiring pair and the negative - pole wirings in the second wiring pair to be both closed, so that the wiring connected between the outer shell of the battery under test and the negative pole of the resistance detection device is conductive, facilitating the subsequent formation of a test circuit for testing the resistance between the outer shell of the battery under test and each power supply interface.

[0071] To pass through the inclusion Figure 4Taking the short - circuit detection system of the short - circuit detection device shown as an example to implement this short - circuit detection method, the control module sends an electrical signal for controlling the switch to close to switch K2 on the negative - pole wire L2 in the first wiring pair and sends an electrical signal for controlling the switch to close to switch K4 on the negative - pole wire L4 in the second wiring pair, closing switches K2 and K4; in this way, the outer shell of the battery under test is conducted to the negative pole of the battery detection device through the negative - pole wire L4, the negative - pole bus N, and the negative - pole wire L2, facilitating subsequent operations to form a test circuit for measuring the resistance between the outer shell of the battery under test and each power - supply interface.

[0072] Exemplarily, controlling the conduction of the line between the outer shell of the battery under test and the resistance detection device may include: controlling both the switch on the positive - pole wire in the first wiring pair and the switch on the positive - pole wire in the second wiring pair to close, so that the outer shell of the battery under test is conducted to the positive pole of the resistance detection device, facilitating subsequent formation of a test circuit for measuring the resistance between the outer shell of the battery under test and each power - supply interface.

[0073] Taking as an example the implementation of the short - circuit detection method by the short - circuit detection system of the short - circuit detection device shown Figure 4 Taking the short - circuit detection system of the short - circuit detection device shown as an example to implement this short - circuit detection method, the control module sends an electrical signal for controlling the switch to close to switch K1 on the positive - pole wire L1 in the first wiring pair and sends an electrical signal for controlling the switch to close to switch K3 on the positive - pole wire L3 in the second wiring pair, closing switches K1 and K3; in this way, the outer shell of the battery under test is conducted to the positive pole of the battery detection device through the positive - pole wire L3, the positive - pole bus P, and the positive - pole wire L1, facilitating subsequent operations to form a test circuit for measuring the resistance between the outer shell of the battery under test and each power - supply interface.

[0074] S20. Control the conduction of the line between the interface of the target electrode in each power - supply interface of the battery under test and the target electrode of the resistance detection device, where the target electrode includes any electrode between the positive pole and the negative pole.

[0075] When the switches on the negative electrodes of the first wiring pair and the switches on the negative electrodes of the second wiring pair are both closed, controlling the conduction of the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device may include: controlling the switches on the positive electrodes of the first wiring pair and the switches on the first positive electrodes of each wiring group to be both closed. In this example, the target electrode is the positive electrode, and the interface of the target electrode is the positive interface. In this way, the conduction between the housing and the negative electrode of the resistance detection device is achieved, and the conduction between the positive electrode of the resistance detection device and the positive interfaces in each power supply interface is achieved, forming a test circuit for testing the resistance between the housing of the battery under test and the positive interfaces of each power supply interface. Thus, the resistance between the positive interfaces in each power supply interface and the housing can be detected simultaneously by the resistance detection device. If there is at least one positive interface that is short-circuited with the housing among the positive interfaces, the resistance value detected by the resistance detection device is the short-circuit resistance value, which is a relatively small value; if there is no positive interface that is short-circuited with the housing among the positive interfaces, that is, the positive interfaces are insulated from the housing, the resistance value detected by the resistance detection device is theoretically infinite and may exceed the measurement range of the resistance detection device in practice.

[0076] It can be achieved through Figure 4 Taking the short-circuit detection system including the short-circuit detection device shown as an example, when the switch K2 on the negative wiring L2 of the first wiring pair and the switch K4 on the negative wiring L4 of the second wiring pair are both closed, the control module sends an electrical signal for controlling the switch to close to the switch K1 on the positive wiring L1 of the first wiring pair, and sends an electrical signal for controlling the switch to close to the switches K A1 、K A3 、……、K A(2n-1) in each wiring group, so as to close K1, K A1 、K A3 、……、K A(2n-1) . In this way, the housing of the battery under test is conducted with the negative electrode of the resistance detection device, and the positive electrode of the resistance detection device is respectively conducted with the positive interfaces in each power supply interface, forming a test circuit for testing the resistance between the housing of the battery under test and the positive interfaces of each power supply interface. Thus, the resistance between the positive interfaces in each power supply interface and the housing can be detected simultaneously by the resistance detection device.

[0077] When the switches on the negative electrodes of the first wiring pair and the negative electrodes of the second wiring pair are both closed, controlling the conduction of the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device may include: controlling the switches on the positive electrodes of the first wiring pair and the second positive electrodes in each wiring group to be closed. In this example, the target electrode is the negative electrode, and the interface of the target electrode is the negative interface. In this way, the conduction between the housing and the negative electrode of the resistance detection device is achieved, and the conduction between the positive electrode of the resistance detection device and the negative interfaces in each power supply interface is achieved, forming a test circuit for testing the resistance between the housing of the battery under test and the negative interfaces of each power supply interface. Thus, the resistance between the negative interfaces and the housing in each power supply interface can be detected simultaneously by the resistance detection device. If there is at least one negative interface short-circuited with the housing among the negative interfaces, the resistance value detected by the resistance detection device is the short-circuit resistance value, which is a relatively small value; if there is no negative interface short-circuited with the housing among the negative interfaces, that is, the negative interfaces are insulated from the housing, the resistance value detected by the resistance detection device is theoretically infinite and may exceed the measurement range of the resistance detection device in practice.

[0078] For example, taking the implementation of this short-circuit detection method through a short-circuit detection system including Figure 4 the short-circuit detection device shown as an example, when the switches K2 on the negative wiring L2 of the first wiring pair and the switches K4 on the negative wiring L4 of the second wiring pair are both closed, the control module sends an electrical signal for controlling the switch to close to the switch K1 on the positive wiring L1 of the first wiring pair, and sends an electrical signal for controlling the switch to close to the switches K A2 、K A4 、……、K A(2n) in each wiring group, so as to close K1, K A2 、K A4 、……、K A(2n) . In this way, the housing of the battery under test is conducted with the negative electrode of the resistance detection device, and the positive electrode of the resistance detection device is respectively conducted with the negative interfaces in each power supply interface, forming a test circuit for testing the resistance between the housing of the battery under test and the negative interfaces of each power supply interface. Thus, the resistance between the negative interfaces and the housing in each power supply interface can be detected simultaneously by the resistance detection device.

[0079] When the switches on the negative electrodes of the first pair of wires and the switches on the negative electrodes of the second pair of wires are both closed, by the above steps of controlling the switches on the positive electrodes of the first pair of wires and the switches on the first positive electrodes of each wire group to be closed, a resistance detection circuit between each positive electrode interface and the housing can be formed, and the resistance values between each positive electrode interface and the housing can be detected simultaneously by the resistance detection device; by the above steps of controlling the switches on the positive electrodes of the first pair of wires and the switches on the second positive electrodes of each wire group to be closed, a resistance detection circuit between each negative electrode interface and the housing can be formed, and the resistance values between each negative electrode interface and the housing can be detected simultaneously by the resistance detection device; thus, the resistance detection between each power supply interface and the housing is realized.

[0080] When the switches on the positive electrodes of the first pair of wires and the switches on the positive electrodes of the second pair of wires are both closed, controlling the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device to be conductive may include: controlling the switches on the negative electrodes of the first pair of wires and the switches on the first negative electrodes of each wire group to be closed. In this example, the target electrode is the positive electrode, and the interface of the target electrode is the positive electrode interface. In this way, the housing is made conductive to the positive electrode of the resistance detection device, and the negative electrode of the resistance detection device is made conductive to the positive electrode interfaces in each wire group, thereby forming a test circuit for testing whether there is a short circuit between the housing of the battery under test and the positive electrode interfaces of each power supply interface.

[0081] For example, taking the short - circuit detection method implemented by a short - circuit detection system including Figure 4 the short - circuit detection device shown as an example, when the switch K1 on the positive electrode wire L1 of the first pair of wires and the switch K3 on the positive electrode wire L3 of the second pair of wires are both closed, the control module sends an electrical signal for controlling the switch to close to the switch K2 on the negative electrode wire L2 of the first pair of wires, and sends electrical signals for controlling the switches to close to the switches K B1 、K B3 .....、K B(2n-1) in each wire group, thereby closing K2, K B1 、K B3 .....、K B(2n-1) . In this way, the housing of the battery under test is made conductive to the positive electrode of the resistance detection device, and the negative electrode of the resistance detection device is respectively made conductive to the positive electrode interfaces in each power supply interface, forming a test circuit for testing the resistance between the housing of the battery under test and the positive electrode interfaces of each power supply interface, so that the resistance between the positive electrode interface and the housing in each power supply interface can be detected by the resistance detection device.

[0082] When the switches on the positive electrodes of the first wiring pair and the switches on the positive electrodes of the second wiring pair are both closed, controlling the line between the interface of the target electrode in each power supply interface of the battery under test and the target electrode of the resistance detection device to be conductive may include: controlling the switches on the negative electrodes of the first wiring pair and the switches on the second negative electrodes in each wiring group to be both closed. In this example, the target electrode is the negative electrode, and the interface of the target electrode is the negative interface. In this way, the conduction between the housing and the positive electrode of the resistance detection device, and the conduction between the negative electrode of the resistance detection device and the negative interfaces in each wiring group are achieved, thereby forming a test circuit for testing the resistance between the housing of the battery under test and the negative interfaces of each power supply interface, so as to test whether there is a short circuit between the housing of the battery under test and the negative interfaces of each power supply interface. If there is at least one negative interface that is short-circuited with the housing among the negative interfaces, the resistance value detected by the resistance detection device is the short-circuit resistance value, which is a relatively small value; if there is no negative interface that is short-circuited with the housing among the negative interfaces, that is, the negative interfaces are insulated from the housing, the resistance value detected by the resistance detection device is theoretically approaching infinity, and in practice, it may exceed the measurement range of the resistance detection device.

[0083] Take the short-circuit detection method implemented by a short-circuit detection system including Figure 4 the short-circuit detection device shown as an example. When the switches K1 on the positive electrode wiring L1 of the first wiring pair and the switches K3 on the positive electrode wiring L3 of the second wiring pair are both closed, the control module sends an electrical signal to control the switch K2 on the negative electrode wiring L2 of the first wiring pair to close the switch, and sends an electrical signal to control the switches K B2 、K B4 、……、K B(2n) in each wiring group to close the switches, so as to close K2, K B2 、K B4 、……、K B(2n) . In this way, the housing of the battery under test is conductive to the positive electrode of the resistance detection device, and the negative electrode of the resistance detection device is respectively conductive to the negative interfaces in each power supply interface, forming a test circuit for testing the resistance between the housing of the battery under test and the negative interfaces of each power supply interface, so that the resistance between the negative interfaces and the housing in each power supply interface can be detected simultaneously by the resistance detection device.

[0084] When the switches on the positive terminals of the first wiring pair and the switches on the positive terminals of the second wiring pair are both closed, control the switches on the negative terminals of the first wiring pair and the switches on the first negative terminals of each wiring group to be closed, so as to test whether there is a short circuit between the outer casing of the battery under test and the positive terminals of each power supply interface; control the switches on the negative terminals of the first wiring pair and the switches on the second negative terminals of each wiring group to be closed, so as to test whether there is a short circuit between the outer casing of the battery under test and the negative terminals of each power supply interface. In this way, the resistance detection between each power supply interface and the outer casing is realized. In addition, a structure different from the aforementioned test circuit is adopted, thus providing a more diverse short-circuit test circuit structure and more test circuit structure solutions.

[0085] S30. Based on the resistance between the outer casing and the power supply interface measured by the resistance detection device, determine whether there is a short circuit between the outer casing and the power supply interface.

[0086] The resistance detection device sends the measured resistance between the outer casing and the power supply interface to the control module. The control module judges whether there is a short circuit condition between the outer casing and the power supply interface according to the resistance measured by the resistance detection device.

[0087] Reference Figure 7 As shown, in some embodiments, based on the resistance between the outer casing and the power supply interface measured by the resistance detection device, determining whether there is a short circuit between the outer casing and the power supply interface may include:

[0088] S301. Determine that there is a short circuit between the outer casing and the target electrode according to the resistance between the outer casing and the target electrode measured by the resistance detection device being less than or equal to the first preset resistance value;

[0089] S302. Determine that there is no short circuit between the outer casing and the target electrode according to the resistance between the outer casing and the target electrode measured by the resistance detection device being greater than the second preset resistance value; wherein, the second preset resistance value is greater than or equal to the first preset resistance value.

[0090] When performing resistance detection, the resistance between each power supply interface of the same pole and the housing is detected simultaneously. For example, the resistance between each positive interface and the housing is detected simultaneously, or the resistance between each negative interface and the housing is detected simultaneously. In the case of a short circuit occurring between the housing and at least one power supply interface of the battery pack, the resistance value detected by the resistance detection device is theoretically close to 0. In practical applications, the resistance value detected by the resistance detection device is small. It can be determined that a short circuit occurs between the housing and the power supply interface when the resistance value is less than or equal to the first preset resistance value; when no short circuit occurs between the housing and each power supply interface of the same pole, the housing and each power supply interface of the same pole are equivalent to an open circuit. Theoretically, the measured resistance value should tend to infinity. The actually measured resistance value will be relatively large, or may exceed the measurement range of the resistance detection device. If the resistance value is greater than the second preset resistance value, it is determined that no short circuit occurs between the housing and the power supply interface. Among them, the situation where the resistance value exceeds the measurement range of the resistance detection device also belongs to the situation where the resistance value is greater than the second preset resistance value. In this way, according to the result of the resistance detection, the control module can determine whether there is a short circuit between the battery housing and the power supply interface. The first preset resistance value and the second preset resistance value can be preset according to the actual application needs.

[0091] By comparing the measured resistance between the housing and the target electrode with the first preset resistance value and the second preset resistance value to determine whether a short circuit occurs, the steps are relatively simple, which can further improve the short circuit detection efficiency.

[0092] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be repeated in this article.

[0093] In a specific example, a short circuit detection method is applied to a short circuit detection system. The short circuit detection system includes Figure 4 the short circuit detection device and the battery under test shown. The second wiring pair is connected to the housing of the battery under test, the wiring group is connected to the power supply interface of the battery under test, and the resistance detection device is a multimeter. The short circuit detection method of this example may include the following steps:

[0094] The control module sends an electrical signal for controlling the switch to close to the switch K2 on the negative wiring L2 in the first wiring pair and sends an electrical signal for controlling the switch to close to the switch K4 on the negative wiring L4 in the second wiring pair, closing the switches K2 and K4; in this way, the housing of the battery under test is conducted to the negative pole of the battery detection device through the negative wiring L4, the negative busbar N, and the negative wiring L2;

[0095] The control module sends an electrical signal for controlling the switch to close to the switch K1 on the positive wiring L1 in the first wiring pair and sends it to the switch K on the first positive wiring in each wiring groupA1 , K A3 , ……, K A(2n-1) Send an electrical signal to close the control switch, thereby closing K1, K A1 , K A3 , ……, K A(2n-1) , so that the outer shell of the battery under test is electrically connected to the negative electrode of the resistance detection device, and the positive electrode of the resistance detection device is electrically connected to the positive electrode interfaces in each power supply interface respectively, forming a test circuit for testing the resistance between the outer shell of the battery under test and the positive electrode interfaces of each power supply interface. Thus, the resistance between the positive electrode interface and the outer shell in each power supply interface can be detected simultaneously by the resistance detection device;

[0096] The control module sends an electrical signal to control the switch K1 on the positive electrode wiring L1 in the first wiring pair to close the switch, and sends an electrical signal to control the switch K on the second positive electrode wiring in each wiring group A2 , K A4 , ……, K A(2n) to send an electrical signal to close the control switch, thereby closing K1, K A2 , K A4 , ……, K A(2n) , so that the outer shell of the battery under test is electrically connected to the negative electrode of the resistance detection device, and the positive electrode of the resistance detection device is electrically connected to the negative electrode interfaces in each power supply interface respectively, forming a test circuit for testing the resistance between the outer shell of the battery under test and the negative electrode interfaces of each power supply interface. Thus, the resistance between the negative electrode interface and the outer shell in each power supply interface can be detected simultaneously by the resistance detection device;

[0097] The control module receives the resistance value sent by the resistance detection device. The control module determines that a short circuit occurs between the outer shell and the power supply interface according to the resistance between the outer shell and the power supply interface measured by the resistance detection device being less than or equal to the first preset resistance value; the control module determines that no short circuit occurs between the outer shell and the power supply interface according to the resistance between the outer shell and the power supply interface measured by the resistance detection device being greater than the second preset resistance value; wherein, the second preset resistance value is greater than or equal to the first preset resistance value. In this way, the detection of whether there is a short circuit between the outer shell and each power supply interface is realized.

[0098] The short-circuit detection method of this example can form a short-circuit detection circuit between the outer shell of the battery under test and the power supply interface by controlling the opening and closing of each switch, so that it can simultaneously test whether there is a power supply interface that is short-circuited with the outer shell of the battery under test among multiple power supply interfaces of the battery under test, improving the short-circuit test efficiency to meet the test beat requirements of the end-of-battery-life cycle test.

[0099] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated herein.

[0100] Another embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. The computer program is executed by a processor to implement the method of any of the above embodiments. It should be noted that examples of computer-readable storage media may include, but are not limited to, optical discs, phase change memories (PRAMs), static random access memories (SRAMs), dynamic random access memories (DRAMs), other types of random access memories (RAMs), read-only memories (ROMs), electrically erasable programmable read-only memories (EEPROMs), flash memories, or other optical and magnetic storage media, which will not be elaborated herein one by one.

[0101] The computer-readable storage medium provided by the above embodiments of the present application and the method provided by the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run, or implemented by the application programs stored therein.

[0102] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities can be referred to each other. For the sake of brevity, they will not be elaborated herein.

[0103] It should be noted that:

[0104] The algorithms and displays provided herein are not inherently related to any specific computer, virtual device, or other equipment. Various general-purpose devices can also be used together with the examples based herein. According to the above description, the structure required to construct such devices is obvious. In addition, the present application is not directed to any specific programming language. It should be understood that the content of the present application described herein can be implemented using various programming languages, and the descriptions of specific languages above are for disclosing the best implementation manners of the present application.

[0105] It should be understood that although the steps in the flowcharts of the drawings are shown sequentially according to the indications of the arrows, these steps are not necessarily executed sequentially according to the indications of the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit and can be executed in other orders. Moreover, at least a part of the steps in the flowcharts of the drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same moment, but can be executed at different moments. Their execution order is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

[0106] The above embodiments merely represent the implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A short circuit detection device, characterized in that: The device comprises a control module, a resistance detection device, a first wiring pair connected to the resistance detection device, a second wiring pair for connecting to the housing of a battery to be tested, and a plurality of wiring groups for connecting to the power supply interface of the battery to be tested; each of the first wiring pair, the second wiring pair, and the wiring groups is provided with a switch; the first wiring pair, the second wiring pair, and the wiring groups are interconnected; The control module is connected to the resistance detection device and each of the switches respectively; The control module is used to control the opening and closing of each of the switches to form a short circuit detection circuit between the housing and the power supply interface.

2. The device according to claim 1, characterized in that The short-circuit detection device also includes a positive busbar and a negative busbar, each of the first wiring pair and the second wiring pair includes a positive wiring connected to the positive busbar and a negative wiring connected to the negative busbar, and the wiring group includes two positive wirings connected to the positive busbar and two negative wirings connected to the negative busbar.

3. The device according to claim 2, characterized in that The wiring group includes a first positive wiring, a second positive wiring, a first negative wiring, a second negative wiring, a first wiring terminal and a second wiring terminal. The first positive wiring and the first negative wiring are both connected to the first wiring terminal, and the second positive wiring and the second negative wiring are both connected to the second wiring terminal; the first wiring terminal is used to connect the positive interface of the power supply interface, and the second wiring terminal is used to connect the negative interface of the power supply interface.

4. A short circuit detection system, characterized in that: The short-circuit detection device comprises the short-circuit detection device according to any one of claims 1 to 3 and a battery to be tested, wherein the second wiring pair is connected to the housing of the battery to be tested, and the wiring group is connected to the power supply interface of the battery to be tested.

5. A short circuit detection method, characterized in that: The short circuit detection system according to claim 4; the detection method comprises: Controlling the conduction of a circuit between the housing of the battery to be tested and the resistance detection device; Controlling the line conduction between the interface of the target electrode in each power supply interface of the battery to be tested and the target electrode of the resistance detection device, wherein the target electrode includes any electrode between the positive electrode and the negative electrode; Based on the resistance between the housing and the power supply interface measured by the resistance detection device, it is determined whether there is a short circuit between the housing and the power supply interface.

6. The method according to claim 5, characterized in that The short-circuit detection system includes the short-circuit detection device according to claim 3; the control of the line conduction between the housing of the battery to be tested and the resistance detection device includes: The switch on the negative electrode connection in the first connection pair and the switch on the negative electrode connection in the second connection pair are controlled to be closed.

7. The method according to claim 6, characterized in that The controlling the line conduction between the interface of the target electrode in each power supply interface of the battery to be tested and the target electrode of the resistance detection device includes one of the following: Controlling the switch on the positive electrode connection in the first connection pair and the switch on the first positive electrode connection in each of the connection groups to be closed; The switch on the positive electrode connection in the first connection pair and the switch on the second positive electrode connection in each of the connection groups are controlled to be closed.

8. The method according to claim 5, characterized in that The short-circuit detection system includes the short-circuit detection device according to claim 3; the control of the line conduction between the housing of the battery to be tested and the resistance detection device includes: The switch on the positive connection in the first connection pair and the switch on the positive connection in the second connection pair are controlled to be closed.

9. The method according to claim 8, characterized in that The controlling the line conduction between the interface of the target electrode in each power supply interface of the battery to be tested and the target electrode of the resistance detection device includes one of the following: Controlling the switch on the negative electrode connection in the first connection pair and the switch on the first negative electrode connection in each of the connection groups to be closed; The switch on the negative electrode connection in the first connection pair and the switch on the second negative electrode connection in each of the connection groups are controlled to be closed.

10. The method according to any one of claims 5 to 9, characterized in that The determining whether there is a short circuit between the housing and the power supply interface based on the resistance between the housing and the power supply interface measured by the resistance detection device includes: determining that a short circuit occurs between the housing and the target electrode based on the resistance between the housing and the target electrode measured by the resistance detection device being less than or equal to a first preset resistance value; According to the resistance between the shell and the target electrode measured by the resistance detection device being greater than a second preset resistance value, it is determined that no short circuit occurs between the shell and the target electrode; the second preset resistance value is greater than or equal to the first preset resistance value.

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