A battery detection circuit

Abstract

This application provides a battery detection circuit, including: an instrument probe input board, a first instrument measurement output board connected to the instrument probe input board, and a second instrument measurement output board connected to the instrument probe input board, to realize the internal resistance detection of a first battery cell connected to the first instrument measurement output board, the internal resistance detection of a second battery cell connected to the second instrument measurement output board, and the insulation detection between the first and second battery cells. Compared with the prior art, by using this application, while realizing the internal resistance detection of multiple battery cells and the insulation detection between the positive terminals of connected battery cells, the number of relays in the first and second instrument measurement output boards is greatly reduced, thus reducing costs.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a battery testing circuit. Background Technology

[0002] As is well known, testing electrical performance in lithium battery production is a core step in ensuring product safety, stability, and compliance, and directly determines the battery's usability and market acceptance.

[0003] During the production of lithium battery modules, it is necessary to perform internal resistance tests on individual cells and insulation tests between the positive terminals of adjacent cells on the modules before the cell foils are welded (at which point the cells in the module are not connected in series or parallel).

[0004] The internal resistance test of a single cell requires the use of a battery internal resistance tester (four-wire system). By switching relays, the four-wire measuring instrument is connected to the positive and negative terminals of each cell one by one. The insulation test between the positive terminals of adjacent cells requires the use of an insulation withstand voltage tester (two-wire system). The positive probe is connected to the positive terminal of the first cell, and the negative probe is connected to the positive terminal of the second cell.

[0005] Because different models of lithium battery modules have different series and parallel connections, for compatibility, it is necessary to meet the requirements of four-wire measurement while also ensuring that the two-wire measurement circuit on each cell terminal meets three test circuit requirements: 1. Each cell terminal can be connected to the positive probe of an insulation withstand voltage tester (two-wire); 2. Each cell terminal can be connected to the negative probe of an insulation withstand voltage tester (two-wire); 3. Each cell terminal can be completely disconnected from both the insulation withstand voltage tester (two-wire) and the four-wire measuring instrument. Only in this way can the insulation test between the positive terminals of adjacent cells be satisfied.

[0006] Based on the above requirements, the existing solutions have the following possible cell arrangement configurations: Figures 1 to 4 circuits, such as Figure 4 As shown, the system includes an input instrument probe board, an instrument measurement output board 1, and an instrument measurement output board 2. The input instrument probe board includes relays k1, K2, K3, K4, K5, and K6. Instrument measurement output board 1 includes relays ka1, Kb1, Kc1, Kd1, Ke1, Kf1, Kg1, and Kh1. Instrument measurement output board 2 includes relays ka2, Kb2, Kc2, Kd2, Ke2, Kf2, Kg2, and Kh2. For insulation testing between the positive terminals of adjacent battery cells, it is necessary to close K1 / K2 on the input instrument probe board, then close Kg1 on instrument measurement output board 1, and finally close Kc2 on instrument measurement output board 2. This allows the positive probe of the insulation withstand voltage tester (two-wire system) to connect to the positive terminal of the first battery cell, and the negative probe to connect to the positive terminal of the second battery cell.

[0007] Because the test circuit includes insulation and withstand voltage tests, with a maximum test voltage of DC 6kV, high-voltage relays are required. Therefore, each instrument's measurement output board needs eight high-voltage relays. In automated production processes, the more cells a single module contains, the more instrument measurement output boards are needed, resulting in a greater number of high-voltage relays and significantly increased material costs. Summary of the Invention

[0008] To address the aforementioned technical problems, this application provides a battery detection circuit. The battery detection circuit includes: an instrument probe input board, a first instrument measurement output board connected to the instrument probe input board, and a second instrument measurement output board connected to the instrument probe input board. This enables the detection of the internal resistance of a first battery cell connected to the first instrument measurement output board, the detection of the internal resistance of a second battery cell connected to the second instrument measurement output board, and the detection of insulation between the first and second battery cells. Compared to existing technologies, this application's solution significantly reduces the number of relays in the first and second instrument measurement output boards while simultaneously achieving the detection of the internal resistance of multiple battery cells and the insulation between the positive terminals of connected battery cells, thereby lowering costs.

[0009] In a first aspect, this application provides a battery detection circuit, comprising: an instrument probe input board, a first instrument measurement output board connected to the instrument probe input board, and a second instrument measurement output board connected to the instrument probe input board, to realize the internal resistance detection of a first battery cell connected to the first instrument measurement output board, the internal resistance detection of a second battery cell connected to the second instrument measurement output board, and the insulation detection between the first battery cell and the second battery cell, wherein...

[0010] The instrument input board includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, and a sixth relay; a first input terminal connected to the first positive probe of a two-wire insulation withstand voltage tester via the first relay; a second input terminal connected to the first negative probe of the two-wire insulation withstand voltage tester via the second relay; a third input terminal connected to the second positive probe of a four-wire measuring instrument via the third relay; a fourth input terminal connected to the third positive probe of the four-wire measuring instrument via the fourth relay; a fifth input terminal connected to the second negative probe of the four-wire measuring instrument via the fifth relay; and a sixth input terminal connected to the third negative probe of the four-wire measuring instrument via the sixth relay.

[0011] The first instrument measurement output board includes: a seventh relay connected to the third input terminal, a first output terminal connected to the seventh relay, an eighth relay connected to the fourth input terminal, a second output terminal connected to the eighth relay, a ninth relay connected to the fifth input terminal, a third output terminal connected to the ninth relay, a tenth relay connected to the sixth input terminal, and a fourth output terminal connected to the tenth relay; the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal are respectively connected to the first battery cell;

[0012] The second instrument measurement output board includes: an eleventh relay connected to the third input terminal, a fifth output terminal connected to the eleventh relay, a twelfth relay connected to the fourth input terminal, a sixth output terminal connected to the twelfth relay, a thirteenth relay connected to the fifth input terminal, a seventh output terminal connected to the thirteenth relay, a fourteenth relay connected to the sixth input terminal, and an eighth output terminal connected to the fourteenth relay; the fifth, sixth, seventh, and eighth output terminals are respectively connected to the second battery cell; wherein, the first input terminal is also connected to the seventh and eleventh relays respectively, and the second input terminal is also connected to the eighth, ninth, twelfth, thirteenth, or eighteenth relays.

[0013] In conjunction with the first aspect, in one alternative implementation,

[0014] The instrument panel input board also includes:

[0015] The fifteenth relay is connected to the seventh input terminal, and the sixteenth relay is connected to the eighth input terminal; wherein the fifteenth relay is interlocked with the first relay through the first interlock circuit, and the sixteenth relay is interlocked with the second relay through the second interlock circuit.

[0016] In conjunction with the first aspect, in one alternative implementation,

[0017] The first instrument measurement output board also includes: a ninth output terminal and a seventeenth relay connected to the ninth output terminal; wherein the seventh relay and the seventeenth relay are interlocked by a third interlock circuit, and the ninth output terminal is also connected to the first battery cell;

[0018] The second instrument measurement output board also includes: a tenth output terminal and an eighteenth relay connected to the tenth output terminal, wherein the eighteenth relay and the thirteenth relay are interlocked by a fourth interlock circuit, and the tenth output terminal is also connected to the second battery cell.

[0019] In conjunction with the first aspect, in one alternative implementation,

[0020] When the first cell and the second cell are connected in parallel, the positive terminal of the first cell is connected to the positive terminal of the second cell, and the negative terminal of the first cell is connected to the negative terminal of the second cell.

[0021] The third, fourth, fifth, sixth, eighth, and eleventh relays are all open, while the first, second, seventh, and twelfth relays are all closed, to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell; among them,

[0022] The seventh relay is also connected to the first input terminal, and the twelfth relay is also connected to the second input terminal. The seventh relay is connected to the positive terminal of the first battery cell through the first output terminal, and the twelfth relay is connected to the positive terminal of the second battery cell through the sixth output terminal.

[0023] In conjunction with the first aspect, in one alternative implementation,

[0024] When the first battery cell and the second battery cell are connected in series, and the positive terminal of the first battery cell is connected to the negative terminal of the second battery cell;

[0025] The third, fourth, fifth, sixth, tenth, and eleventh relays are all open, while the first, sixteenth, seventh, and fourteenth relays are all closed to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell; among them,

[0026] The seventh relay is also connected to the first input terminal, and the fourteenth relay is also connected to the eighth input terminal. The seventh relay is connected to the positive terminal of the first battery cell through the first output terminal, and the fourteenth relay is connected to the positive terminal of the second battery cell through the eighth output terminal.

[0027] In conjunction with the first aspect, in one alternative implementation,

[0028] When the first cell and the second cell are connected in series, and the negative terminal of the first cell is connected to the positive terminal of the second cell;

[0029] The third, fourth, fifth, sixth, eighth, and thirteenth relays are all open, while the second, fifteenth, twelfth, and ninth relays are all closed to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell; among them,

[0030] The ninth relay is also connected to the seventh input terminal, and the twelfth relay is also connected to the second input terminal. The ninth relay is connected to the positive terminal of the first battery cell through the third output terminal, and the twelfth relay is connected to the positive terminal of the second battery cell through the sixth output terminal.

[0031] In conjunction with the first aspect, in one alternative implementation,

[0032] When the first cell and the second cell are connected in parallel, the positive terminal of the first cell is connected to the positive terminal of the second cell, and the negative terminal of the first cell is connected to the negative terminal of the second cell.

[0033] The third, fourth, fifth, sixth, thirteenth, and tenth relays are all open, while the fifteenth, sixteenth, ninth, and fourteenth relays are all closed to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell; among them,

[0034] The ninth relay is also connected to the seventh input terminal, and the fourteenth relay is also connected to the eighth input terminal. The ninth relay is connected to the positive terminal of the first battery cell through the third output terminal, and the fourteenth relay is connected to the positive terminal of the second battery cell through the eighth output terminal.

[0035] In conjunction with the first aspect, in one alternative implementation,

[0036] When the first cell and the second cell are connected in parallel, the positive terminal of the first cell is connected to the positive terminal of the second cell, and the negative terminal of the first cell is connected to the negative terminal of the second cell.

[0037] The third, fourth, fifth, sixth, ninth, and eleventh relays are all open, while the first, second, seventh, and eighteenth relays are all closed to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell; among them,

[0038] The seventh relay is also connected to the first input terminal, and the eighteenth relay is also connected to the second input terminal. The seventh relay is connected to the positive terminal of the first battery cell through the first output terminal, and the eighteenth relay is connected to the positive terminal of the second battery cell through the tenth output terminal.

[0039] In conjunction with the first aspect, in one alternative implementation,

[0040] When the first battery cell and the second battery cell are connected in series, and the positive terminal of the first battery cell is connected to the negative terminal of the second battery cell;

[0041] The third, fourth, fifth, sixth, ninth, and eleventh relays are all disconnected, while the first, second, seventh, and thirteenth relays are all closed, in order to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell.

[0042] The seventh relay is also connected to the first input terminal, the thirteenth relay is also connected to the second input terminal, the seventh relay is connected to the positive terminal of the first battery cell through the first output terminal, and the thirteenth relay is connected to the positive terminal of the second battery cell through the seventh output terminal.

[0043] In conjunction with the first aspect, in one alternative implementation,

[0044] When the first cell and the second cell are connected in series, and the negative terminal of the first cell is connected to the positive terminal of the second cell;

[0045] The third, fourth, fifth, sixth, seventh, thirteenth, seventeenth, and eighteenth relays are all disconnected, while the first, second, ninth, and eleventh relays are all closed, in order to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell.

[0046] The ninth relay is also connected to the second input terminal, the eleventh relay is also connected to the first input terminal, the ninth relay is connected to the positive terminal of the first battery cell through the third output terminal, and the eleventh relay is connected to the positive terminal of the second battery cell through the fifth output terminal.

[0047] In conjunction with the first aspect, in one alternative implementation,

[0048] When the first cell and the second cell are connected in series, and the negative terminal of the first cell is connected to the positive terminal of the second cell;

[0049] The third, fourth, fifth, sixth, seventh, ninth, eleventh, and thirteenth relays are all disconnected, while the first, second, seventeenth, and eighteenth relays are all closed to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell.

[0050] Among them, the seventeenth relay is also connected to the first input terminal, the eighteenth relay is also connected to the second input terminal, the seventeenth relay is connected to the positive terminal of the first battery cell through the ninth output terminal, and the eighteenth relay is connected to the positive terminal of the second battery cell through the tenth output terminal.

[0051] In conjunction with the first aspect, in one alternative implementation,

[0052] When the first cell and the second cell are connected in parallel, the positive terminal of the first cell is connected to the positive terminal of the second cell, and the negative terminal of the first cell is connected to the negative terminal of the second cell.

[0053] The third, fourth, fifth, sixth, ninth, and eleventh relays are all disconnected, while the first, second, seventeenth, and thirteenth relays are all closed, in order to detect the insulation between the positive terminal of the first battery cell and the positive terminal of the second battery cell.

[0054] Among them, the seventeenth relay is also connected to the first input terminal, the thirteenth relay is also connected to the second input terminal, the seventeenth relay is connected to the positive terminal of the first battery cell through the ninth output terminal, and the thirteenth relay is connected to the positive terminal of the second battery cell through the seventh output terminal.

[0055] In conjunction with the first aspect, in one alternative implementation,

[0056] When the third, fourth, fifth, and sixth relays are all closed, and the first, second, fifteenth, and sixteenth relays are all open, the seventh, eighth, ninth, and tenth relays are all closed, and the eleventh, twelfth, thirteenth, and fourteenth relays are all open, in order to detect the internal resistance of the first battery cell.

[0057] In conjunction with the first aspect, in one alternative implementation,

[0058] When the third, fourth, fifth, and sixth relays are all closed, and the first, second, fifteenth, and sixteenth relays are all open, the eleventh, twelfth, thirteenth, and fourteenth relays are all closed, and the seventh, eighth, ninth, and tenth relays are all open, in order to detect the internal resistance of the second battery cell.

[0059] This application provides a battery detection circuit, including: an instrument probe input board, a first instrument measurement output board connected to the instrument probe input board, and a second instrument measurement output board connected to the instrument probe input board, to realize the internal resistance detection of a first battery cell connected to the first instrument measurement output board, the internal resistance detection of a second battery cell connected to the second instrument measurement output board, and the insulation detection between the first battery cell and the second battery cell.

[0060] The instrument input board includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, and a sixth relay; a first input terminal connected to the first positive probe of a two-wire insulation withstand voltage tester via the first relay; a second input terminal connected to the first negative probe of the two-wire insulation withstand voltage tester via the second relay; a third input terminal connected to the second positive probe of a four-wire measuring instrument via the third relay; a fourth input terminal connected to the third positive probe of the four-wire measuring instrument via the fourth relay; a fifth input terminal connected to the second negative probe of the four-wire measuring instrument via the fifth relay; and a sixth input terminal connected to the third negative probe of the four-wire measuring instrument via the sixth relay.

[0061] The first instrument measurement output board includes: a seventh relay connected to the third input terminal, a first output terminal connected to the seventh relay, an eighth relay connected to the fourth input terminal, a second output terminal connected to the eighth relay, a ninth relay connected to the fifth input terminal, a third output terminal connected to the ninth relay, a tenth relay connected to the sixth input terminal, and a fourth output terminal connected to the tenth relay; the first output terminal, the second output terminal, the third output terminal, and the fourth output terminal are respectively connected to the first battery cell;

[0062] The second instrument measurement output board includes: an eleventh relay connected to the third input terminal, a fifth output terminal connected to the eleventh relay, a twelfth relay connected to the fourth input terminal, a sixth output terminal connected to the twelfth relay, a thirteenth relay connected to the fifth input terminal, a seventh output terminal connected to the thirteenth relay, a fourteenth relay connected to the sixth input terminal, and an eighth output terminal connected to the fourteenth relay; the fifth, sixth, seventh, and eighth output terminals are respectively connected to the second battery cell; wherein, the first input terminal is also connected to the seventh and eleventh relays respectively, and the second input terminal is also connected to the eighth, ninth, twelfth, thirteenth, or eighteenth relays.

[0063] Compared to existing technologies, this application achieves the detection of internal resistance of multiple battery cells and insulation between the positive terminals of connected battery cells, while significantly reducing the number of relays in the first and second instrument measurement output boards, thus lowering costs. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1This is a schematic diagram of a detection circuit in the prior art provided in this application;

[0066] Figure 2 This is a schematic diagram of a detection circuit in another prior art provided in this application;

[0067] Figure 3 This is a schematic diagram of a detection circuit in another prior art provided in this application;

[0068] Figure 4 This is a schematic diagram of a detection circuit in another prior art provided in this application;

[0069] Figure 5 This is a schematic diagram of a detection circuit provided in this application;

[0070] Figure 6 This is a schematic diagram of another detection circuit provided in this application;

[0071] Figure 7 This is a schematic diagram of yet another detection circuit provided in this application;

[0072] Figure 8 This is a schematic diagram of yet another detection circuit provided in this application;

[0073] Figure 9 This is a schematic diagram of yet another detection circuit provided in this application;

[0074] Figure 10 This is a schematic diagram of yet another detection circuit provided in this application;

[0075] Figure 11 This is a schematic diagram of yet another detection circuit provided in this application;

[0076] Figure 12 This is a schematic diagram of another detection circuit provided in this application.

[0077] Among them, 11-instrument probe input board, 12-first instrument measurement output board, 13-second instrument measurement output board, 1101-first relay, 1102-second relay, 1103-third relay, 1104-fourth relay, 1105-fifth relay, 1106-sixth relay, 1107-fifteenth relay, 1108-sixteenth relay, 1121-first input terminal, 1122-second input terminal, 1123-third input terminal, 1124-fourth input terminal, 1125-fifth input terminal, 1126-sixth input terminal, 1127-seventh input terminal, 1128-eighth input terminal.

[0078] 1201 - Seventh Relay, 1202 - Eighth Relay, 1203 - Ninth Relay, 1204 - Tenth Relay, 1205 - Seventeenth Relay, 1221 - First Output Terminal, 1222 - Second Output Terminal, 1223 - Third Output Terminal, 1224 - Fourth Output Terminal, 1225 - Ninth Output Terminal

[0079] 1301 - Eleventh Relay, 1302 - Twelfth Relay, 1303 - Thirteenth Relay, 1304 - Fourteenth Relay, 1305 - Eighteenth Relay, 1321 - Fifth Output Terminal, 1322 - Sixth Output Terminal, 1323 - Seventh Output Terminal, 1324 - Eighth Output Terminal, 1325 - Tenth Output Terminal. Detailed Implementation

[0080] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0081] It should be noted that the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," "eighth," "ninth," "tenth," "eleventh," "twelfth," "thirteenth," "fourteenth," "fifteenth," "sixteenth," "seventeenth," and "eighteenth" in this application are only used to distinguish different relays, positive probes, negative probes, battery cells, instrument measurement output boards, input terminals, output terminals, interlock circuits, different preset addresses, different addresses, different PWM signals, different values, etc., and have no other meaning, and should not limit the scope of protection of this application.

[0082] See Figure 5 This is a schematic diagram of a battery detection circuit provided in this application, such as... Figure 5 As shown, the battery detection circuit may include, but is not limited to:

[0083] The instrument probe input board 11, the first instrument measurement output board 12 connected to the instrument probe input board 11, and the second instrument measurement output board 13 connected to the instrument probe input board 11 are configured to perform internal resistance detection of the first battery cell 14 connected to the first instrument measurement output board 12, internal resistance detection of the second battery cell 15 connected to the second instrument measurement output board 13, and insulation detection between the first battery cell 14 and the second battery cell 15.

[0084] The instrument probe input board 11 includes: a first relay 1101, a second relay 1102, a third relay 1103, a fourth relay 1104, a fifth relay 1105, and a sixth relay 1106; a first input terminal 1121 connected to the first positive probe (e.g., HV+) of the two-wire insulation withstand voltage tester via the first relay 1101; a second input terminal 1122 connected to the first negative probe (e.g., HV-) of the two-wire insulation withstand voltage tester via the second relay 1102; and a sixth input terminal 1106 connected to the third relay 1106. Electrical appliance 1103 is connected to the third input terminal 1123 of the four-wire measuring instrument via the second positive probe (e.g., V+); the fourth input terminal 1124 is connected to the third positive probe (e.g., I+) of the four-wire measuring instrument via the fourth relay 1104; the fifth input terminal 1125 is connected to the second negative probe (e.g., V-) of the four-wire measuring instrument via the fifth relay 1105; and the sixth input terminal 1126 is connected to the third negative probe (e.g., I-) of the four-wire measuring instrument via the sixth relay 1106.

[0085] The first instrument measurement output board 12 includes: a seventh relay 1201 connected to the third input terminal 1123, a first output terminal 1221 connected to the seventh relay 1201, an eighth relay 1202 connected to the fourth input terminal 1124, a second output terminal 1222 connected to the eighth input terminal 1202, a ninth relay 1203 connected to the fifth input terminal 1125, a third output terminal 1223 connected to the ninth input terminal 1203, a tenth relay 1204 connected to the sixth input terminal 1126, and a fourth output terminal 1224 connected to the tenth input terminal 1204; the first output terminal 1221, the second output terminal 1222, the third output terminal 1223, and the fourth output terminal 1224 are respectively connected to the first battery cell 14;

[0086] The second instrument measurement output board 13 includes: an eleventh relay 1301 connected to the third input terminal 1123; a fifth output terminal 1321 connected to the eleventh relay 1301; a twelfth relay 1302 connected to the fourth input terminal 1124; a sixth output terminal 1322 connected to the twelfth relay 1302; a thirteenth relay 1303 connected to the fifth input terminal 1125; a seventh output terminal 1323 connected to the thirteenth relay 1303; and a fourteenth relay 1304 connected to the sixth input terminal 1126. 4. The eighth output terminal 1324 is connected to the fourteenth relay 1304; the fifth output terminal 1321, the sixth output terminal 1322, the seventh output terminal 1323 and the eighth output terminal 1324 are respectively connected to the second battery cell 15; wherein, the first input terminal 1121 is also connected to the seventh relay 1201 and the eleventh relay 1301 respectively, and the second input terminal 1122 is also connected to the eighth relay 1202, the ninth relay 1203, the twelfth relay 1302, the thirteenth relay 1303 or the eighteenth relay 1305.

[0087] Compared with the prior art, the solution described in this application can achieve the internal resistance detection of the first battery cell 14 and the second battery cell 15, as well as the insulation detection between the positive terminals of the first battery cell 14 and the second battery cell 15, while greatly reducing the number of relays in the first instrument measurement output board 12 and the second instrument measurement output board 13, thus reducing costs.

[0088] Optionally, the instrument probe input panel 11 also includes:

[0089] The fifteenth relay 1107 is connected to the seventh input terminal 1127, and the sixteenth relay 1108 is connected to the eighth input terminal 1128. The fifteenth relay 1107 is interlocked with the first relay 1101 through a first interlock circuit, so that the fifteenth relay 1107 and the first relay 1101 do not close at the same time, to prevent the positive and negative terminals of the second battery cell 15 from being directly connected together, which would cause the second battery cell 15 to short-circuit. The sixteenth relay 1108 is interlocked with the second relay 1102 through a second interlock circuit, so that the sixteenth relay 1108 and the second relay 1102 do not close at the same time, to prevent the positive and negative terminals of the first battery cell 14 from being directly connected together, which would cause the first battery cell 14 to short-circuit.

[0090] For example, in the insulation test between the positive terminals of adjacent first cell 14 and second cell 15, if the first cell 14 and second cell 15 are connected in different ways, such as in series or in parallel, the first instrument measurement output board 12 and the second instrument measurement output board 13 need to close the corresponding relays respectively under different connection methods, which is quite complex. This can easily cause short circuits in the cells, bringing unnecessary risks and even causing fires.

[0091] For example Figure 4 In the existing scheme with cell arrangement scenario four, when Ka1 and Kg1 are closed simultaneously, the cell connected to Ka1 with the negative terminal and Kg1 with the positive terminal is short-circuited.

[0092] Optionally, the first instrument measurement output board 12 further includes: a ninth output terminal 1225, and a seventeenth relay 1205 connected to the ninth output terminal 1225; wherein, the seventh relay 1201 and the seventeenth relay 1205 are interlocked by a third interlock circuit, so that the seventh relay 1201 and the seventeenth relay 1205 do not close at the same time, so as to prevent the positive and negative terminals of the first battery cell 14 from being directly connected together, causing the first battery cell 14 to short-circuit. The ninth output terminal 1225 is also connected to the first battery cell 14.

[0093] The second instrument measurement output board 13 also includes: a tenth output terminal 1325, and an eighteenth relay 1305 connected to the tenth output terminal 1325. The eighteenth relay 1305 and the thirteenth relay 1303 are interlocked by a fourth interlock circuit, so that the eighteenth relay 1305 and the thirteenth relay 1303 do not close at the same time, so as to prevent the positive and negative terminals of the second battery cell 15 from being directly connected together, which would cause the second battery cell 15 to short circuit. The tenth output terminal 1325 is also connected to the second battery cell 15.

[0094] It should be noted that, depending on the different connection methods of the first battery cell 14 and the second battery cell 15, the closed or open settings of the relays in the instrument probe input board 11, the first instrument measurement output board 12, and the second instrument measurement output board 13 of the battery detection circuit provided in this application are all different, as described below, or see also [link to relevant documentation]. Figures 5 to 12 .

[0095] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in parallel, the positive terminal of the first battery cell 14 is connected to the positive terminal of the second battery cell 15, and the negative terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0096] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the eighth relay 1202, and the eleventh relay 1301 are all open, while the first relay 1101, the second relay 1102, the seventh relay 1201, and the twelfth relay 1302 are all closed to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15; wherein,

[0097] The seventh relay 1201 is also connected to the first input terminal 1121, and the twelfth relay 1302 is also connected to the second input terminal 1122. The seventh relay 1201 is connected to the positive terminal of the first battery cell 14 through the first output terminal 1221, and the twelfth relay 1302 is connected to the positive terminal of the second battery cell 15 through the sixth output terminal 1322.

[0098] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in series, the positive terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0099] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the tenth relay 1204, and the eleventh relay 1301 are all open, while the first relay 1101, the sixteenth relay 1108, the seventh relay 1201, and the fourteenth relay 1304 are all closed to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15; wherein,

[0100] The seventh relay 1201 is also connected to the first input terminal 1121, and the fourteenth relay 1304 is also connected to the eighth input terminal 1128. The seventh relay 1201 is connected to the positive terminal of the first battery cell 14 through the first output terminal 1221, and the fourteenth relay 1304 is connected to the positive terminal of the second battery cell 15 through the eighth output terminal 1324.

[0101] Optionally, when the first cell 14 and the second cell 15 are connected in series, the negative terminal of the first cell 14 is connected to the positive terminal of the second cell 15.

[0102] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the eighth relay 1202, and the thirteenth relay 1303 are all open, while the second relay 1102, the fifteenth relay 1107, the twelfth relay 1302, and the ninth relay 1203 are all closed to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15; wherein,

[0103] The ninth relay 1203 is also connected to the seventh input terminal 1127, and the twelfth relay 1302 is also connected to the second input terminal 1122. The ninth relay 1203 is connected to the positive terminal of the first battery cell 14 through the third output terminal 1223, and the twelfth relay 1302 is connected to the positive terminal of the second battery cell 15 through the sixth output terminal 1322.

[0104] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in parallel, the positive terminal of the first battery cell 14 is connected to the positive terminal of the second battery cell 15, and the negative terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0105] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the thirteenth relay 1303, and the tenth relay 1204 are all open, while the fifteenth relay 1107, the sixteenth relay 1108, the ninth relay 1203, and the fourteenth relay 1304 are all closed to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15; wherein,

[0106] The ninth relay 1203 is also connected to the seventh input terminal 1127, and the fourteenth relay 1304 is also connected to the eighth input terminal 1128. The ninth relay 1203 is connected to the positive terminal of the first battery cell 14 through the third output terminal 1223, and the fourteenth relay 1304 is connected to the positive terminal of the second battery cell 15 through the eighth output terminal 1324.

[0107] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in parallel, the positive terminal of the first battery cell 14 is connected to the positive terminal of the second battery cell 15, and the negative terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0108] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the ninth relay 1203, and the eleventh relay 1301 are all open, while the first relay 1101, the second relay 1102, the seventh relay 1201, and the eighteenth relay 1305 are all closed to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15; wherein,

[0109] The seventh relay 1201 is also connected to the first input terminal 1121, and the eighteenth relay 1305 is also connected to the second input terminal 1122. The seventh relay 1201 is connected to the positive terminal of the first battery cell 14 through the first output terminal 1221, and the eighteenth relay 1305 is connected to the positive terminal of the second battery cell 15 through the tenth output terminal 1325.

[0110] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in series, the positive terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0111] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the ninth relay 1203, and the eleventh relay 1301 are all open, while the first relay 1101, the second relay 1102, the seventh relay 1201, and the thirteenth relay 1303 are all closed, in order to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15.

[0112] The seventh relay 1201 is also connected to the first input terminal 1121, and the thirteenth relay 1303 is also connected to the second input terminal 1122. The seventh relay 1201 is connected to the positive terminal of the first battery cell 14 through the first output terminal 1221, and the thirteenth relay 1303 is connected to the positive terminal of the second battery cell 15 through the seventh output terminal 1323.

[0113] Optionally, when the first cell 14 and the second cell 15 are connected in series, the negative terminal of the first cell 14 is connected to the positive terminal of the second cell 15.

[0114] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the seventh relay 1201, the thirteenth relay 1303, the seventeenth relay 1205, and the eighteenth relay 1305 are all open, while the first relay 1101, the second relay 1102, the ninth relay 1203, and the eleventh relay 1301 are all closed, in order to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15.

[0115] Among them, the ninth relay 1203 is also connected to the second input terminal 1122, the eleventh relay 1301 is also connected to the first input terminal 1121, the ninth relay 1203 is connected to the positive terminal of the first battery cell 14 through the third output terminal 1223, and the eleventh relay 1301 is connected to the positive terminal of the second battery cell 15 through the fifth output terminal 1321.

[0116] Optionally, when the first cell 14 and the second cell 15 are connected in series, the negative terminal of the first cell 14 is connected to the positive terminal of the second cell 15.

[0117] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the seventh relay 1201, the ninth relay 1203, the eleventh relay 1301, and the thirteenth relay 1303 are all open, while the first relay 1101, the second relay 1102, the seventeenth relay 1205, and the eighteenth relay 1305 are all closed, in order to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15.

[0118] Among them, the seventeenth relay 1205 is also connected to the first input terminal 1121, the eighteenth relay 1305 is also connected to the second input terminal 1122, the seventeenth relay 1205 is connected to the positive terminal of the first battery cell 14 through the ninth output terminal 1225, and the eighteenth relay 1305 is connected to the positive terminal of the second battery cell 15 through the tenth output terminal 1325.

[0119] Optionally, when the first battery cell 14 and the second battery cell 15 are connected in parallel, the positive terminal of the first battery cell 14 is connected to the positive terminal of the second battery cell 15, and the negative terminal of the first battery cell 14 is connected to the negative terminal of the second battery cell 15.

[0120] The third relay 1103, the fourth relay 1104, the fifth relay 1105, the sixth relay 1106, the ninth relay 1203, and the eleventh relay 1301 are all open, while the first relay 1101, the second relay 1102, the seventeenth relay 1205, and the thirteenth relay 1303 are all closed, in order to detect the insulation between the positive terminal of the first battery cell 14 and the positive terminal of the second battery cell 15.

[0121] Among them, the seventeenth relay 1205 is also connected to the first input terminal 1121, the thirteenth relay 1303 is also connected to the second input terminal 1122, the seventeenth relay 1205 is connected to the positive terminal of the first battery cell 14 through the ninth output terminal 1225, and the thirteenth relay 1303 is connected to the positive terminal of the second battery cell 15 through the seventh output terminal 1323.

[0122] Optionally, when the third relay 1103, the fourth relay 1104, the fifth relay 1105, and the sixth relay 1106 are all closed, and the first relay 1101, the second relay 1102, the fifteenth relay 1107, and the sixteenth relay 1108 are all open, the seventh relay 1201, the eighth relay 1202, the ninth relay 1203, and the tenth relay 1204 are all closed, and the eleventh relay 1301, the twelfth relay 1302, the thirteenth relay 1303, and the fourteenth relay 1304 are all open, in order to detect the internal resistance of the first battery cell 14.

[0123] Optionally, when the third relay 1103, the fourth relay 1104, the fifth relay 1105, and the sixth relay 1106 are all closed, and the first relay 1101, the second relay 1102, the fifteenth relay 1107, and the sixteenth relay 1108 are all open, the eleventh relay 1301, the twelfth relay 1302, the thirteenth relay 1303, and the fourteenth relay 1304 are all closed, and the seventh relay 1201, the eighth relay 1202, the ninth relay 1203, and the tenth relay 1204 are all open, in order to detect the internal resistance of the second battery cell 15.

[0124] Figures 5 to 12 This is only used to illustrate the embodiments of this application and should not be construed as limiting the scope of protection of this application.

[0125] Those skilled in the art will recognize that the components or devices of the various examples described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0126] The embodiments of the components described above are merely illustrative. For example, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface or port, or it may be an electrical, mechanical or other form of connection.

[0127] Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0128] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery detection circuit, characterized by, The utility model relates to an instrument pen input board (11), a first instrument measurement output board (12) connected with the instrument pen input board (11), a second instrument measurement output board (13) connected with the instrument pen input board (11), to realize the internal resistance detection of the first electric core (14) connected with the first instrument measurement output board (12), the internal resistance detection of the second electric core (15) connected with the second instrument measurement output board (13) and the insulation detection between the first electric core (14) and the second electric core (15), wherein, The instrument pen input board (11) comprises: a first relay (1101), a second relay (1102), a third relay (1103), a fourth relay (1104), a fifth relay (1105), a sixth relay (1106), a first input end (1121) connected with the first positive pen of the two-wire insulation voltage-withstanding instrument through the first relay (1101), a second input end (1122) connected with the first negative pen of the two-wire insulation voltage-withstanding instrument through the second relay (1102), a third input end (1123) connected with the second positive pen of the four-wire measurement instrument through the third relay (1103), a fourth input end (1124) connected with the third positive pen of the four-wire measurement instrument through the fourth relay, a fifth input end (1125) connected with the second negative pen of the four-wire measurement instrument through the fifth relay (1105), and a sixth input end (1126) connected with the third negative pen of the four-wire measurement instrument through the sixth relay (1106); The first instrument measurement output board (12) comprises: a seventh relay (1201) connected with the third input end (1123), a first output end (1221) connected with the seventh relay (1201), an eighth relay (1202) connected with the fourth input end (1124), a second output end (1222) connected with the eighth relay (1202), a ninth relay (1203) connected with the fifth input end (1125), a third output end (1223) connected with the ninth relay (1203), a tenth relay (1204) connected with the sixth input end (1126), and a fourth output end (1224) connected with the tenth relay (1204); the first output end (1221), the second output end (1222), the third output end (1223) and the fourth output end (1224) are connected with the first electric core (14) respectively; ​ The second instrument measurement output board (13) comprises: an eleventh relay (1301) connected with the third input end (1123), a fifth output end (1321) connected with the eleventh relay (1301), a twelfth relay (1302) connected with the fourth input end (1124), a sixth output end (1322) connected with the twelfth relay (1302), a thirteenth relay (1303) connected with the fifth input end (1125), a seventh output end (1323) connected with the thirteenth relay (1303), a fourteenth relay (1304) connected with the sixth input end (1126), and an eighth output end (1324) connected with the fourteenth relay (1304); the fifth output end (1321), the sixth output end (1322), the seventh output end (1323), and the eighth output end (1324) are respectively connected with the second battery cell (15); wherein the first input end (1121) is also connected with the seventh relay (1201) and the eleventh relay (1301), and the second input end (1122) is also connected with the eighth relay (1202), the ninth relay (1203), the twelfth relay (1302), the thirteenth relay (1303), or the eighteenth relay (1305).

2. The battery detection circuit of claim 1, wherein, The instrument pen input board (11) further comprises: a fifteenth relay (1107) connected with the seventh input end (1127) and a sixteenth relay (1108) connected with the eighth input end (1128); wherein the fifteenth relay (1107) and the first relay (1101) are interlocked through a first interlocking circuit, and the sixteenth relay (1108) and the second relay (1102) are interlocked through a second interlocking circuit.

3. The battery detection circuit of claim 1, wherein, The first instrument measurement output board (12) further comprises: a ninth output end (1225), and a seventeenth relay (1205) connected with the ninth output end (1225); wherein the seventh relay (1201) and the seventeenth relay (1205) are interlocked through a third interlocking circuit, and the ninth output end (1225) is also connected with the first battery cell (14); The second instrument measurement output board (13) further comprises: a tenth output end (1325), and an eighteenth relay (1305) connected with the tenth output end (1325); wherein the eighteenth relay (1305) and the thirteenth relay (1303) are interlocked through a fourth interlocking circuit, and the tenth output end (1325) is also connected with the second battery cell (15).

4. The battery detection circuit of claim 2, wherein, when the first battery cell (14) and the second battery cell (15) are connected in parallel, and the positive pole of the first battery cell (14) is connected with the positive pole of the second battery cell (15), and the negative pole of the first battery cell (14) is connected with the negative pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the eighth relay (1202), and the eleventh relay (1301) are all open, and the first relay (1101) and the second relay (1102), the seventh relay (1201), and the twelfth relay (1302) are all closed, to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); wherein, The seventh relay (1201) is further connected to the first input end (1121), and the twelfth relay (1302) is further connected to the second input end (1122). The seventh relay (1201) is connected to the positive pole of the first battery cell (14) through the first output end (1221), and the twelfth relay (1302) is connected to the positive pole of the second battery cell (15) through the sixth output end (1322).

5. The battery detection circuit of claim 2, wherein, when the first battery cell (14) and the second battery cell (15) are connected in series, and the positive pole of the first battery cell (14) is connected to the negative pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the tenth relay (1204), and the eleventh relay (1301) are all open, and the first relay (1101) and the sixteenth relay (1108), the seventh relay (1201), and the fourteenth relay (1304) are all closed, to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); wherein, The seventh relay (1201) is further connected to the first input end (1121), and the fourteenth relay (1304) is further connected to the eighth input end (1128). The seventh relay (1201) is connected to the positive pole of the first battery cell (14) through the first output end (1221), and the fourteenth relay (1304) is connected to the positive pole of the second battery cell (15) through the eighth output end (1324).

6. The battery detection circuit of claim 2, wherein, when the first battery cell (14) and the second battery cell (15) are connected in series, and the negative pole of the first battery cell (14) is connected to the positive pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the eighth relay (1202), and the thirteenth relay (1303) are all open, and the second relay (1102) and the fifteenth relay (1107), the twelfth relay (1302), and the ninth relay (1203) are all closed, to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); wherein, The ninth relay (1203) is also connected with the seventh input end (1127), and the twelfth relay (1302) is also connected with the second input end (1122). The ninth relay (1203) is connected with the positive pole of the first battery cell (14) through the third output end (1223), and the twelfth relay (1302) is connected with the positive pole of the second battery cell (15) through the sixth output end (1322).

7. The battery detection circuit of claim 2, wherein, when the first battery cell (14) and the second battery cell (15) are connected in parallel, and the positive pole of the first battery cell (14) is connected with the positive pole of the second battery cell (15), and the negative pole of the first battery cell (14) is connected with the negative pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the thirteenth relay (1303), and the tenth relay (1204) are all open, and the fifteenth relay (1107) and the sixteenth relay (1108), the ninth relay (1203), and the fourteenth relay (1304) are all closed, so as to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); wherein, The ninth relay (1203) is also connected with the seventh input end (1127), and the fourteenth relay (1304) is also connected with the eighth input end (1128). The ninth relay (1203) is connected with the positive pole of the first battery cell (14) through the third output end (1223), and the fourteenth relay (1304) is connected with the positive pole of the second battery cell (15) through the eighth output end (1324).

8. The battery detection circuit of claim 3, wherein, when the first battery cell (14) and the second battery cell (15) are connected in parallel, and the positive pole of the first battery cell (14) is connected with the positive pole of the second battery cell (15), and the negative pole of the first battery cell (14) is connected with the negative pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the ninth relay (1203), and the eleventh relay (1301) are all open, and the first relay (1101) and the second relay (1102), the seventh relay (1201), and the eighteenth relay (1305) are all closed, so as to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); wherein, The seventh relay (1201) is also connected with the first input end (1121), and the eighteenth relay (1305) is also connected with the second input end (1122). The seventh relay (1201) is connected with the positive pole of the first battery cell (14) through the first output end (1221), and the eighteenth relay (1305) is connected with the positive pole of the second battery cell (15) through the tenth output end (1325).

9. The battery detection circuit of claim 3, wherein, When the first electric core (14) and the second electric core (15) are connected in series, and the positive pole of the first electric core (14) is connected with the negative pole of the second electric core (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the ninth relay (1203), and the eleventh relay (1301) are all disconnected, and the first relay (1101) and the second relay (1102), the seventh relay (1201), and the thirteenth relay (1303) are all connected, so as to detect the insulation between the positive pole of the first electric core (14) and the positive pole of the second electric core (15); The seventh relay (1201) is further connected with the first input end (1121), the thirteenth relay (1303) is further connected with the second input end (1122), the seventh relay (1201) is connected with the positive pole of the first electric core (14) through the first output end (1221), and the thirteenth relay (1303) is connected with the positive pole of the second electric core (15) through the seventh output end (1323).

10. The battery detection circuit of claim 3, wherein, When the first electric core (14) and the second electric core (15) are connected in series, and the negative pole of the first electric core (14) is connected with the positive pole of the second electric core (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the seventh relay (1201), the thirteenth relay (1303), the seventeenth relay (1205), and the eighteenth relay (1305) are all disconnected, and the first relay (1101) and the second relay (1102), the ninth relay (1203), and the eleventh relay (1301) are all connected, so as to detect the insulation between the positive pole of the first electric core (14) and the positive pole of the second electric core (15); The ninth relay (1203) is further connected with the second input end (1122), the eleventh relay (1301) is further connected with the first input end (1121), the ninth relay (1203) is connected with the positive pole of the first electric core (14) through the third output end (1223), and the eleventh relay (1301) is connected with the positive pole of the second electric core (15) through the fifth output end (1321).

11. The battery detection circuit of claim 3, wherein, When the first electric core (14) and the second electric core (15) are connected in series, and the negative pole of the first electric core (14) is connected with the positive pole of the second electric core (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the seventh relay (1201), the ninth relay (1203), the eleventh relay (1301), the thirteenth relay (1303) are all open, and the first relay (1101) and the second relay (1102), the seventeenth relay (1205), the eighteenth relay (1305) are all closed to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); The seventeenth relay (1205) is further connected with the first input end (1121), and the eighteenth relay (1305) is further connected with the second input end (1122). The seventeenth relay (1205) is connected with the positive pole of the first battery cell (14) through the ninth output end (1225), and the eighteenth relay (1305) is connected with the positive pole of the second battery cell (15) through the tenth output end (1325).

12. The battery detection circuit of claim 3, wherein, When the first battery cell (14) and the second battery cell (15) are connected in parallel, and the positive pole of the first battery cell (14) is connected with the positive pole of the second battery cell (15), and the negative pole of the first battery cell (14) is connected with the negative pole of the second battery cell (15); The third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106), the ninth relay (1203), the eleventh relay (1301) are all open, and the first relay (1101) and the second relay (1102), the seventeenth relay (1205), the thirteenth relay (1303) are all closed to detect the insulation between the positive pole of the first battery cell (14) and the positive pole of the second battery cell (15); The seventeenth relay (1205) is further connected with the first input end (1121), and the thirteenth relay (1303) is further connected with the second input end (1122). The seventeenth relay (1205) is connected with the positive pole of the first battery cell (14) through the ninth output end (1225), and the thirteenth relay (1303) is connected with the positive pole of the second battery cell (15) through the seventh output end (1323).

13. The battery detection circuit of claim 2, wherein, When the third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106) are all closed, the first relay (1101), the second relay (1102), the fifteenth relay (1107), the sixteenth relay (1108) are all open, the seventh relay (1201), the eighth relay (1202), the ninth relay (1203), the tenth relay (1204) are all closed, and the eleventh relay (1301), the twelfth relay (1302), the thirteenth relay (1303) and the fourteenth relay (1304) are all open to detect the internal resistance of the first battery cell (14).

14. The battery detection circuit of claim 2, wherein, when the third relay (1103), the fourth relay (1104), the fifth relay (1105), the sixth relay (1106) are all closed, the first relay (1101), the second relay (1102), the fifteenth relay (1107), the sixteenth relay (1108) are all opened, the eleventh relay (1301), the twelfth relay (1302), the thirteenth relay (1303), the fourteenth relay (1304) are all closed, and the seventh relay (1201), the eighth relay (1202), the ninth relay (1203), the tenth relay (1204) are all opened, the internal resistance of the second battery cell (15) is detected.

Images