BMS temperature control circuit, system and test tool

Abstract

The utility model provides a BMS temperature control circuit, a system and a test tool, and relates to the technical field of BMS temperature adjustment test. The BMS temperature control circuit comprises a control module and at least two test branches, the test branches are connected in parallel and correspond to different test temperatures, each test branch at least comprises a switch assembly, and each switch assembly is connected with the control module; the control module is used for sending different control instructions to the test branches so as to conduct the corresponding test branches. On the basis, the technical problems of long test time, high cost and low efficiency in the prior art can be solved, the operation of manually adjusting the resistance value of the resistor is avoided, and the test accuracy and the test efficiency are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to BMS temperature control circuit, system and test tool field, especially to a kind of BMS temperature control circuit, system and test tool. BACKGROUND

[0002] Generally, lithium battery temperature management is a basic control management of battery management system (Battery Management System, BMS) to lithium battery, to realize lithium battery low-temperature forbidden charge, low-temperature forbidden discharge, high-temperature forbidden charge, high-temperature forbidden discharge and temperature difference protection by timely adjustment when battery management system monitors that temperature exceeds threshold value.

[0003] At present, BMS product just temperature precision detection mode, related technology is to utilize negative temperature coefficient thermistor, detects multiple different temperatures in high-low temperature box, and then realizes temperature precision test.And thermistor decreases with the increase of temperature, each temperature will correspond a fixed resistance value, and due to the long temperature stabilization time, the temperature range precision test is realized by the above-mentioned mode not only will spend a lot of test time, also will increase test cost.

[0004] Although related technology can realize different temperature test through adjustable resistance, but still need manual resistance adjustment to simulate thermistor value under different temperatures, and the scheme still will spend a lot of manual cost, if the number of channels increases, test time will also greatly increase, and the resistance value of adjustable resistance is susceptible to environmental interference, and then affect the accuracy of BMS product. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of BMS temperature control circuit, system and test tool, can overcome or at least partially alleviate the technical problems, such as long test time, high cost and low efficiency in related technology, avoid manual resistance adjustment operation, greatly improve test accuracy and test efficiency.

[0006] Firstly, a kind of BMS temperature control circuit is applied to power energy storage system, and BMS temperature control circuit includes:

[0007] Control module;

[0008] At least two test branches, each test branch is connected in parallel, and each test branch corresponds different test temperature, wherein each test branch includes at least one switch component, and each switch component is connected with control module;

[0009] Control module is used to send different control instructions to each test branch, to turn on corresponding test branch under the same working time, and provide preset temperature for power energy storage system.

[0010] Optionally, for any test branch, the test branch further comprises a resistance module, and the switch assembly corresponding to the current test branch is connected in series with the resistance module.

[0011] The resistance value of each resistance module is equal to the equivalent resistance value of a test temperature, and the equivalent resistance values of the test temperatures are all different.

[0012] Optionally, each test branch further comprises a protection module.

[0013] The first ends of the resistance modules are interconnected.

[0014] For any test branch, the second end of the current resistance module is connected with the first end of the corresponding switch assembly, the second end of the corresponding switch assembly is connected in parallel with the protection module to protect the control module through the protection module, and the control end of the corresponding switch assembly is connected with the control module.

[0015] Optionally, the resistance module comprises at least one resistance with a fixed resistance value, and the resistances are arranged in series and / or in parallel.

[0016] Optionally, for any test branch, the corresponding temperature difference between two adjacent test branches in the preset direction satisfies [15℃, 25℃].

[0017] Optionally, when the three test branches are included and are respectively a first test branch, a second test branch and a third test branch along the preset direction, the corresponding test temperature between the first test branch is -15℃, the corresponding test temperature between the second test branch is 0℃, and the corresponding test temperature between the third test branch is 25℃.

[0018] Optionally, the protection module comprises a freewheeling diode, when the switch assembly adopts a TLC59281DBQR chip, the first end of the freewheeling diode is connected with the first pin of the TLC59281DBQR chip, and the second end of the freewheeling diode is connected with the eighth pin of the TLC59281DBQR chip.

[0019] Optionally, the protection module further comprises at least one current-limiting resistor and at least one LED lamp, the current-limiting resistor and the LED lamp are arranged in series to form a series branch, and the series branch is connected in parallel with the freewheeling diode.

[0020] In the second aspect, the utility model further provides a BMS temperature monitoring control system, including the BMS temperature control circuit of any one of the above-mentioned first aspect.

[0021] In the third aspect, the utility model further provides a BMS temperature test tool, including the BMS temperature control circuit of any one of the above-mentioned first aspect.

[0022] The utility model provides a kind of BMS temperature control circuit, system and test tool, with following beneficial effects:

[0023] The utility model provides a kind of BMS temperature control circuit, the BMS temperature control circuit includes: control module, at least two test branches, each test branch is connected in parallel between, and each test branch corresponds different test temperature, wherein, each test branch includes at least one switch component, each switch component is connected with control module;Control module is used to send different control instructions to each test branch, to turn on corresponding test branch.Based on this, the utility model can overcome the technical problem of long test time, high cost and low efficiency in the related art, avoid the operation of manually adjusting resistance value, greatly improve test accuracy and test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a structure schematic view of the BMS temperature control circuit provided for the embodiment;

[0026] Figure 2 It is a structure schematic view of the BMS temperature control circuit provided for the embodiment;

[0027] Figure 3 It is a structure schematic view of the BMS temperature control circuit provided for the embodiment;

[0028] Figure 4 It is a structure schematic view of the BMS temperature control circuit provided for the embodiment;

[0029] Figure 5 It is a circuit schematic view of the BMS temperature control circuit provided for the embodiment;

[0030] Figure 6 It is a circuit schematic view of the BMS temperature control circuit provided for the embodiment;

[0031] Figure 7 It is a circuit schematic view of the BMS temperature control circuit provided for the embodiment;

[0032] Figure 8 It is a circuit schematic view of the BMS temperature control circuit provided for the embodiment.

[0033] Icon: 10 - BMS temperature control circuit; 101 - control module; 102 - test branch; 201 - switch assembly; 202 - resistance module; 203 - protection module; 204 - indication module; 102A - first test branch; 102B - second test branch; 102C - third test branch; R1 - first resistance; R2 - second resistance; R3 - third resistance; R4 - fourth resistance; R5 - fifth resistance; R6 - sixth resistance; R7 - seventh resistance; R8 - eighth resistance; R9 - first current limiting resistance; R10 - second current limiting resistance; R11 - third current limiting resistance; R12 - fourth current limiting resistance; R13 - fifth current limiting resistance; R14 - sixth current limiting resistance; R15 - seventh current limiting resistance; R16 - eighth current limiting resistance; K1 - first switch assembly; K2 - second switch assembly; K3 - third switch assembly; K4 - fourth switch assembly; K5 - fifth switch assembly; K6 - sixth switch assembly; K7 - seventh switch assembly; K8 - eighth switch assembly; D1 - first LED lamp; D2 - first freewheeling diode; D3 - second LED lamp; D4 - second freewheeling diode; D5 - third LED lamp; D6 - third freewheeling diode; D7 - fourth LED lamp; D8 - fourth freewheeling diode; D9 - fifth LED lamp; D10 - fifth freewheeling diode; D11 - sixth LED lamp; D12 - sixth freewheeling diode; D13 - seventh LED lamp; D14 - seventh freewheeling diode; D15 - eighth LED lamp; D16 - eighth freewheeling diode. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0036] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] As described in the background section, lithium batteries are extremely sensitive to temperature during charging and discharging. Charging and discharging must be prohibited at low and high temperatures. Therefore, lithium batteries must be used with a BMS to alarm and protect against the collected temperature values, which places high demands on the accuracy of temperature acquisition.

[0041] Related solutions, such as setting an adjustable resistor to simulate the resistance of a thermistor at different temperatures, eliminate the need for high and low temperature chambers. While this can improve the convenience of the testing solution to some extent, it cannot reduce labor costs.

[0042] Based on this, the present invention provides a BMS temperature control scheme to overcome the above problems. The above scheme will be described in detail below.

[0043] Please refer to Figure 1 , Figure 1 The diagram shows a structural schematic of a BMS temperature control circuit provided in this embodiment, which is applied to a power energy storage system. The BMS temperature control circuit 10 includes a control module 101 and at least two test branches 102. The test branches 102 are connected in parallel and each test branch 102 corresponds to a different test temperature. Each test branch 102 includes at least one switch component 201, and each switch component 201 is connected to the control module 101.

[0044] In this embodiment, the control module is used to send different control commands to each switching component to conduct the corresponding test branch at the same working moment, so as to provide a preset temperature for the power storage system.

[0045] It should be noted that the embodiment is not limited to the specific values of the test temperature corresponding to the test branch, which can be set according to actual conditions. For example, the test temperature can be set in the range of -20℃ to 125℃.

[0046] Based on this, the test branch in the embodiment corresponds to a plurality of different test temperatures, which can provide a plurality of temperature environments for the precision test of the power energy storage system; and the adjustment of the test branch at the same working time is realized by using the control module to adjust to the preset temperature, so that the power energy storage system completes the test at the current test temperature, thereby overcoming the technical problems of long test time, high cost and low efficiency in the related art, eliminating the manual adjustment of the resistance value, and greatly improving the test accuracy and test efficiency.

[0047] The test branch in the embodiment includes a plurality of implementation manners, for example, can be realized by a switch assembly. In one possible implementation manner, please refer to Figure 2 , Figure 2 The structure schematic diagram of another BMS temperature control circuit provided by the embodiment is shown, and in the embodiment, for any test branch 102, the test branch 102 further includes a resistance module 202, and the switch assembly 201 corresponding to the current test branch 102 is connected in series with the resistance module 202.

[0048] Among them, the resistance value of each resistance module is equal to the equivalent resistance value of a test temperature, and the equivalent resistance values of the test temperatures are all different.

[0049] The resistance value of the resistance module in the embodiment can be set as the equivalent resistance of the thermistor at different temperatures. In one possible implementation manner, the resistance module includes at least one resistance with a fixed resistance value, and the resistances are arranged in series and / or parallel. For example, when the resistance module includes one resistance with a fixed resistance value, the resistance value of the resistance is directly equal to the equivalent resistance value of the corresponding test temperature. For another example, when the resistance module includes two resistances with fixed resistance values, if the two resistances are arranged in series, the total resistance of the two resistances in series is equal to the equivalent resistance value of the corresponding test temperature. For another example, when the resistance module includes two resistances with fixed resistance values, if the two resistances are arranged in parallel, the total resistance of the two resistances in parallel is equal to the equivalent resistance value of the corresponding test temperature. Similarly, if the resistance module includes a plurality of resistances with fixed resistance values, the total resistance of the resistance module corresponding to the test temperature is equal to the equivalent resistance value of the corresponding test temperature.

[0050] In the embodiment, the test branches correspond to different test temperatures, and it should be noted that, in order to ensure the accuracy of the BMS temperature control circuit, the temperature difference between any two adjacent test branches in the preset direction in any test branch in the embodiment satisfies [15℃, 25℃].

[0051] Please refer to Figure 2on the basis of Figure 3 , Figure 3 The structural schematic diagram of another BMS temperature control circuit provided by the embodiment is shown. When three test branches are included, and the first test branch 102A, the second test branch 102B and the third test branch 102C are respectively arranged in a preset direction, the corresponding test temperature between the first test branch 102A is-15℃; the corresponding test temperature between the second test branch 102B is 0℃; and the corresponding test temperature between the third test branch 102C is 25℃.

[0052] In a possible implementation manner, when eight test branches 102 are included, the resistance modules 202 on each test branch 102 are respectively set as the resistance values of the thermistors corresponding to-40℃, -15℃, 0℃, 25℃, 40℃, 60℃, 85℃ and 125℃, and the corresponding resistance values are respectively 3.147M, 715K, 324K, 100K, 53.2K, 24.69K, 10.455K and 3.214K. In order to guarantee the accuracy of the BMS temperature control circuit, the thermistor of the HG104F4R22-1000NSY08 type can be selected.

[0053] In order to guarantee the stability of the BMS temperature control circuit, on the basis of Figure 1 , reference can be made to Figure 4 , Figure 4 The structural schematic diagram of another BMS temperature control circuit provided by the embodiment is shown. Each test branch 102 further includes a protection module 203. The first ends of the resistance modules 202 are interconnected.

[0054] For any test branch 102, the second end of the current resistance module 202 is connected with the first end of the corresponding switch assembly 201. The corresponding switch assembly 201 is connected with the protection module 203 in parallel, so as to protect the control module 101 through the protection module 203. The control end of the corresponding switch assembly 201 is connected with the control module 101.

[0055] In a possible implementation manner, on the basis of Figure 4 , reference can be made to Figure 5 , Figure 5 The circuit schematic diagram of the BMS temperature control circuit provided by the embodiment is shown. For any test branch 102, the protection module 203 includes a freewheeling diode, so as to protect the control module 101.

[0056] When the switch assembly 201 adopts the G6K-2P-Y DC12 chip, the first end of the freewheeling diode is connected with the first pin of the G6K-2P-Y DC12 chip. The second end of the freewheeling diode is connected with the eighth pin of the G6K-2P-Y DC12 chip.

[0057] Please continue to referFigure 5 In the embodiment, for any test branch, the fourth pin and the fifth pin of the G6K-2P-Y DC12 chip are connected with the corresponding resistance module 202; the third pin and the sixth pin of the G6K-2P-Y DC12 chip are connected; the eighth pin of the G6K-2P-Y DC12 chip is connected with the control module 101; and the first pin of the G6K-2P-Y DC12 chip is also connected with the 12V power supply.

[0058] The eighth pin of the G6K-2P-Y DC12 chip is connected with the control module 101, for example, the eighth pin of the G6K-2P-Y DC12 chip is connected with any output end (for example, the OUT0 end) of the control chip; when the number of the G6K-2P-Y DC12 chip is n, the eighth pin of the remaining G6K-2P-Y DC12 chip is sequentially connected with the OUT1 end, …, the OUTn-1 end of the control chip. Based on this, the freewheeling diode provided in the embodiment can correspondingly ensure the control module 101.

[0059] In the embodiment, the control module 101 can be a master control chip, and the switch assembly 201 can be a G6K-2P-Y DC12 chip. The G6K-2P-Y DC12 chip is connected with the master control chip through a serial interface. The master control chip is used to send a control signal to the G6K-2P-Y DC12 chip to correspondingly adjust the off or on state of the switch assembly 201, thereby realizing the adjustment of the test branch.

[0060] If 32 channels (test branches 102) need to be controlled, two TLC59281DBQR chips (driving chips) can be used in the embodiment, please refer to Figure 6 , Figure 6 The circuit principle diagram of the driving chip in the embodiment is shown, for example, one of the chips U2 (the SOUT pin (the 22th pin) of the TLC59281DBQR chip) is connected with another chip U3 (the SIN pin (the 2th pin) of the TLC59281DBQR chip); at the same time, the SCLK pin between the chip U2 and the chip U3 is interconnected, and the BLANK pin between the chip U2 and the chip U3 is interconnected.

[0061] Please refer to Figure 7 , Figure 7A circuit schematic diagram of the BMS temperature control circuit provided by the embodiment is shown; the BMS temperature control circuit in the embodiment further comprises an indication module 204 for indicating the on or off state of the corresponding test branch, wherein the indication module 204 on any test branch 102 comprises at least one current-limiting resistor and at least one LED lamp, the current-limiting resistor and the LED lamp are arranged in series to form a series branch, and the series branch is connected in parallel with a freewheeling diode. In the embodiment, when the switch assembly 201 is closed, the LED lamp is correspondingly turned on; when the switch assembly 201 is opened, the LED lamp is correspondingly turned off.

[0062] It should be noted that in the embodiment Figure 7 It is only shown that the indication module 204 comprises one current-limiting resistor and one LED lamp, when a plurality of current-limiting resistors are included, the current-limiting resistors can be connected in series and / or parallel, and the embodiment does not limit the specific connection relationship, as long as the total resistance between the current-limiting resistors meets the requirements, the current-limiting protection can be realized, at the same time, the final current-limiting resistance formed by the current-limiting resistors is connected in series with the LED lamp. Similarly, the number of LED lamps in the embodiment is not limited.

[0063] Reference Figure 8 , Figure 8 Another circuit schematic diagram of the BMS temperature control circuit provided by the embodiment is shown; when 8 test branches 102 are included, each resistance module 202 in the above-mentioned 8 test branches 102 comprises a fixed resistor, for example, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7 and eighth resistor R8; the above-mentioned 8 test branches 102 further comprise first switch assembly K1, second switch assembly K2, third switch assembly K3, fourth switch assembly K4, fifth switch assembly K5, sixth switch assembly K6, seventh switch assembly K7 and eighth switch assembly K8; the above-mentioned 8 test branches 102 further comprise first LED lamp D1, first freewheeling diode D2, second LED lamp D3, second freewheeling diode D4, third LED lamp D5, third freewheeling diode D6, fourth LED lamp D7, fourth freewheeling diode D8, fifth LED lamp D9, fifth freewheeling diode D10, sixth LED lamp D11, sixth freewheeling diode D12, seventh LED lamp D13, seventh freewheeling diode D14, eighth LED lamp D15 and eighth freewheeling diode D16.

[0064] The first ends of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are interconnected, which can be used as the NTC- end; the first switch component K1, the second switch component K2, the third switch component K3, the fourth switch component K4, the fifth switch component K5, the sixth switch component K6, the seventh switch component K7 and the eighth switch component K8 are interconnected with the first pin of the corresponding chip and connected with the output end of the 12V power supply; correspondingly, the third pin and the sixth pin of each switch component 201 are interconnected with the corresponding chip and used as the NTC+ end; and then the temperature collection end of the corresponding test branch 102 can be realized through the NTC- end and the NTC+ end. The eighth pin of each switch component 201 is connected with the corresponding output end of the control module 101, so as to realize the control of the corresponding switch component 201.

[0065] The connection relationship of the remaining pins of the switch component 201 corresponding chip will not be described here, and the corresponding connection relationship in the above embodiment can be referred to. For example, the 4th pin and the 5th pin of the first switch component K1 are connected together and connected with one end of the first resistor R1. Similarly, the 4th pin and the 5th pin of the second switch component K2 are connected together and connected with one end of the second resistor R2; …; the 4th pin and the 5th pin of the eighth switch component K8 are connected together and connected with one end of the eighth resistor R8. Among them, a freewheeling diode is arranged between the 8th pin and the 7th pin of each switch component 201, for example, a first freewheeling diode D2 is arranged between the 8th pin and the 1st pin of the first switch component K1. Similarly, a second freewheeling diode D4 is arranged between the 8th pin and the 1st pin of the second switch component K2, …, an eighth freewheeling diode D16 is arranged between the 8th pin and the 1st pin of the eighth switch component K8. At the same time, a freewheeling resistor and an LED lamp connected in series are arranged between the 8th pin and the 7th pin of each switch component 201, for example, a first LED lamp D1 and a first current-limiting resistor R9 connected in series are arranged between the 8th pin and the 1st pin of the first switch component K1. Similarly, a second LED lamp D3 and a second current-limiting resistor R10 connected in series are arranged between the 8th pin and the 1st pin of the second switch component K2, …, an eighth LED lamp D15 and an eighth current-limiting resistor R16 connected in series are arranged between the 8th pin and the 1st pin of the eighth switch component K8.

[0066] In conclusion, the utility model can overcome the technical problem of long test time, high cost and low efficiency in the related art, avoid manual adjustment of the resistance value, and greatly improve the test accuracy and test efficiency. The utility model adopts the fixed resistance mode to simulate the NTC resistance value under different temperatures, realizes the rapid switching of different temperatures through the switching of the switch component, avoids the manual adjustment of the resistance value, and greatly improves the test accuracy and test efficiency.

[0067] Similar to the idea in the previous embodiment, the utility model still provides a kind of BMS temperature monitoring control system, including the BMS temperature control circuit of any one of the above first aspect, to overcome the technical problem of long test time, high cost, low efficiency in the related art, avoid the operation of manual adjustment resistance resistance value, greatly improve test accuracy and test efficiency.

[0068] Similar to the idea in the previous embodiment, the utility model still provides a kind of BMS temperature test tool, including the BMS temperature control circuit described in any one of the above first aspect, to overcome the technical problem of long test time, high cost, low efficiency in the related art, avoid the operation of manual adjustment resistance resistance value, greatly improve test accuracy and test efficiency.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them;Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features;And these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A BMS temperature control circuit, applied in a power energy storage system, characterized in that, The BMS temperature control circuit includes: Control module; At least two test branches are connected in parallel, and each test branch corresponds to a different test temperature. Each test branch includes at least one switching component, and each switching component is connected to the control module. The control module is used to send different control commands to each of the test branches to conduct the corresponding test branches at the same working time, so as to provide a preset temperature for the power storage system.

2. The BMS temperature control circuit according to claim 1, characterized in that, For any test branch, the test branch also includes a resistor module, and the switching component corresponding to the current test branch is connected in series with the resistor module; Each resistor module has a resistance value equal to the equivalent resistance value at a test temperature, and the equivalent resistance value is different for each test temperature.

3. The BMS temperature control circuit according to claim 2, characterized in that, Each of the test branches also includes a protection module; The first terminals of each resistor module are interconnected; For any test branch, the second terminal of the current resistor module is connected to the first terminal of the corresponding switch assembly; the corresponding switch assembly is connected in parallel with the protection module to protect the control module; the control terminal of the corresponding switch assembly is connected to the control module.

4. The BMS temperature control circuit according to claim 2 or 3, characterized in that, The resistor module includes at least one resistor with a fixed resistance value, and the resistors are connected in series and / or in parallel.

5. The BMS temperature control circuit according to any one of claims 1 to 3, characterized in that, For any test branch, the temperature difference between two adjacent test branches in a preset direction satisfies [15℃, 25℃].

6. The BMS temperature control circuit according to claim 5, characterized in that, When there are three test branches, and they are designated as the first test branch, the second test branch, and the third test branch along a preset direction, the corresponding test temperature between the first test branches is -15℃; the corresponding test temperature between the second test branches is 0℃; and the corresponding test temperature between the third test branches is 25℃.

7. The BMS temperature control circuit according to claim 3, characterized in that, The protection module includes a freewheeling diode; when the switching assembly uses a TLC59281DBQR chip, the first end of the freewheeling diode is connected to the first pin of the TLC59281DBQR chip; the second end of the freewheeling diode is connected to the eighth pin of the TLC59281DBQR chip.

8. The BMS temperature control circuit according to claim 7, characterized in that, The protection module also includes at least one current-limiting resistor and at least one LED. The current-limiting resistor and the LED are connected in series to form a series branch, which is connected in parallel with the freewheeling diode.

9. A BMS temperature monitoring and control system, characterized in that, Includes the BMS temperature control circuit according to any one of claims 1-8.

10. A BMS temperature testing fixture, characterized in that, Includes the BMS temperature control circuit according to any one of claims 1-8.

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