Polarity switching device and battery production system
By generating pulse signals through the control module and controlling the polarity switching device using interlocking and drive mechanisms, the problem of battery short circuit caused by simultaneous signal activation during polarity switching is solved, thus achieving battery protection and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG LYRIC ROBOT INTELLIGENT AUTOMATION CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-06-16
AI Technical Summary
During polarity switching, multiple signal sources output simultaneously, which can easily lead to simultaneous signal activation and cause battery short circuits. Existing technologies cannot effectively control this and therefore cannot provide protection.
A control module generates pulse signals, which are then switched to low level when all pulse signals are high level via an interlocking mechanism. Combined with a drive mechanism to amplify the signals and control the switching state of the polarity switching mechanism, the switch modules are prevented from opening simultaneously, thus protecting the product under test.
It effectively avoids battery short circuits, improves the reliability of polarity switching, reduces downtime, and lowers production costs.
Smart Images
Figure CN224366162U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of product manufacturing technology, and in particular to a polarity switching device and a battery manufacturing system. Background Technology
[0002] With the continuous development of the new energy industry, the battery manufacturing industry has also begun to emerge. An important step in battery production is the reverse polarity charge-discharge test to assess battery performance. During polarity switching, rapid switching can effectively improve production line utilization, reduce downtime, and lower production costs. Currently, most polarity switching circuits implement this function using switching devices.
[0003] However, during polarity switching, multiple signal sources output simultaneously, often resulting in simultaneous signal activation, which can cause a battery short circuit. Specifically, during polarity switching, the inability to control the simultaneous high signal levels leads to the switching devices opening at the same time, further causing a battery short circuit and rendering the protection ineffective. Utility Model Content
[0004] The main objective of this application is to provide a polarity switching device that can prevent the switching mechanism from being fully opened, thereby avoiding a short circuit in the battery.
[0005] To achieve the above objectives, a first aspect of this application provides a polarity switching device, comprising:
[0006] The control module is used to generate multiple pulse signals;
[0007] An interlocking mechanism, connected to the control module, converts the pulse signals to a second level when all the pulse signals are at the first level, thereby obtaining an interlocking level signal;
[0008] A drive mechanism is connected to the interlock mechanism, and the drive mechanism is used to output a drive signal corresponding to the interlock level signal;
[0009] The polarity switching mechanism includes a switching module that corresponds one-to-one with the electrode of the product under test. The polarity switching mechanism is used to receive the driving signal output by the driving mechanism to adjust the switching state of the switching module. The first level corresponds to the level that controls the switching module to be turned on, and the second level corresponds to the level that controls the switching module to be turned off.
[0010] In some embodiments, the pulse signal includes a first pulse signal and a second pulse signal, and the interlocking mechanism is used to convert the first pulse signal and the second pulse signal into a second level when both the first pulse signal and the second pulse signal are at a first level, so as to obtain a first interlocking level signal corresponding to the first pulse signal and a second interlocking level signal corresponding to the second pulse signal.
[0011] In some embodiments, the driving mechanism is used to amplify the first interlock level signal and the second interlock level signal to obtain a first driving signal corresponding to the first interlock level signal and a second driving signal corresponding to the second interlock level signal.
[0012] In some embodiments, the interlocking mechanism includes a first interlocking switch and a second interlocking switch, wherein the first interlocking switch and the second interlocking switch cooperate to convert the first pulse signal and the second pulse signal into a second level.
[0013] In some embodiments, the switching module includes a first switching element connected to a first electrode of the product under test and a second switching element connected to a second electrode of the product under test; the polarity switching mechanism is used to turn off the first switching element and the second switching element when both the first pulse signal and the second pulse signal are at the second level.
[0014] In some embodiments, the interlocking mechanism is further configured to maintain the levels of the first pulse signal and the second pulse signal when the first pulse signal and / or the second pulse signal are at a second level; the driving mechanism is further configured to output a third driving signal corresponding to the first pulse signal and a fourth driving signal corresponding to the second pulse signal when the first pulse signal and / or the second pulse signal are at a second level.
[0015] In some embodiments, the first interlocking switch includes a first resistor, a first switching transistor, and a second switching transistor; the second interlocking switch includes a second resistor, a third switching transistor, and a fourth switching transistor; one end of the first resistor is connected to the control module, and the other end of the first resistor is connected to the control pin of the first switching transistor; the first switching pin of the first switching transistor is connected to a reference ground; the control pin of the second switching transistor is connected between the control module and the first resistor; the second switching pin of the second switching transistor is connected between the second resistor and the control pin of the third switching transistor; the third switching pin of the second switching transistor is connected to a reference ground; one end of the second resistor is connected to the control module, and the other end of the second resistor is connected to the control pin of the third switching transistor; the fourth switching pin of the third switching transistor is connected to a reference ground; the control pin of the fourth switching transistor is connected between the control module and the second resistor; the fifth switching pin of the fourth switching transistor is connected between the first resistor and the control pin of the first switching transistor; and the sixth switching pin of the fourth switching transistor is connected to a reference ground.
[0016] In some embodiments, the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor are all one of a transistor, a diode, a MOSFET, or an insulated gate bipolar transistor.
[0017] In some embodiments, the first switching element is a MOSFET or a relay, and the second switching element is a MOSFET or a relay.
[0018] Secondly, embodiments of this application provide a battery production system, including the polarity switching device as described in the first aspect.
[0019] The polarity switching device and battery production system proposed in this application have the following beneficial effects: The polarity switching device in this application includes a control module, an interlock mechanism, a drive mechanism, and a polarity switching mechanism. The control module generates multiple pulse signals. The interlock mechanism is connected to the control module to determine whether to perform an interlock operation on the pulse signals based on the level of the multiple pulse signals. When all pulse signals are at the first level, it means that all pulse signals are high-level signals. At this time, the interlock mechanism converts the pulse signals to the second level to pull the pulse signals low and converts the pulse signals to the low-level signals to obtain the interlock level signal, thereby avoiding the situation where the signals are all high, which facilitates the subsequent control of the switching module. The drive mechanism is connected to the interlock mechanism to amplify the interlock level signal output by the interlock mechanism and output a drive signal corresponding to the interlock level signal. The polarity switching mechanism includes a switch module that corresponds one-to-one with the electrode of the product under test (DUT). This switch module enables polarity switching of the DUT. The polarity switching mechanism receives drive signals output by the drive mechanism. Since the first level in this embodiment controls the switch module to open and the second level controls it to close, the polarity switching mechanism can adjust the switching state of the switch module based on the received drive signal. This prevents simultaneous opening of switch modules during polarity switching, further preventing short circuits and protecting the DUT. Through the cooperation of the interlocking mechanism, drive mechanism, and polarity switching mechanism, this embodiment can pull the pulse signal low when all pulse signals are high, further preventing simultaneous opening of switch modules connected to the DUT's polarity and protecting the DUT.
[0020] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description and the accompanying drawings. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the framework of the polarity switching device provided in the embodiments of this application;
[0022] Figure 2 This is a circuit diagram of the interlocking mechanism provided in the embodiments of this application;
[0023] Figure 3 This is a schematic diagram of the battery production system provided in the embodiments of this application. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0025] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0027] With the continuous development of the new energy industry, the battery manufacturing industry has also begun to emerge. An important step in battery production is the reverse polarity charge-discharge test to assess battery performance. During polarity switching, rapid switching can effectively improve production line utilization, reduce downtime, and lower production costs. Currently, most polarity switching circuits implement this function using switching devices.
[0028] However, during polarity switching, multiple signal sources output simultaneously, often resulting in simultaneous signal activation, which can cause a battery short circuit. Specifically, during polarity switching, the inability to control the simultaneous signal activation leads to the switching devices turning on at the same time. When the switching devices are simultaneously on, they cannot be quickly shut off, resulting in a battery short circuit and failing to provide protection.
[0029] To address the aforementioned issues, this embodiment provides a polarity switching device and a battery production system. The polarity switching device of this embodiment includes a control module, an interlock mechanism, a drive mechanism, and a polarity switching mechanism. The control module generates multiple pulse signals. The interlock mechanism is connected to the control module to determine whether to perform an interlock operation on the pulse signals based on the level of the multiple pulse signals. When all pulse signals are at a first level, it indicates that all pulse signals are high-level signals. At this time, the interlock mechanism converts the pulse signals to a second level to pull the pulse signals low, thus converting the pulse signals to a low-level signal to obtain an interlock level signal. This avoids the situation where signals are all high, facilitating subsequent control of the switching module. The drive mechanism is connected to the interlock mechanism to amplify the interlock level signal output by the interlock mechanism and output a drive signal corresponding to the interlock level signal. The polarity switching mechanism includes a switch module that corresponds one-to-one with the electrode of the product under test (DUT). This switch module enables polarity switching of the DUT. The polarity switching mechanism receives drive signals output by the drive mechanism. Since the first level in this embodiment controls the switch module to open and the second level controls it to close, the polarity switching mechanism can adjust the switching state of the switch module based on the received drive signal. This prevents simultaneous opening of switch modules during polarity switching, further preventing short circuits and protecting the DUT. Through the cooperation of the interlocking mechanism, drive mechanism, and polarity switching mechanism, this embodiment can pull the pulse signal low when all pulse signals are high, further preventing simultaneous opening of switch modules connected to the DUT's polarity and protecting the DUT.
[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the polarity switching device provided in the embodiments of this application.
[0031] In some embodiments, the polarity switching device includes a control module 100, an interlock mechanism 200, a drive mechanism 300, and a polarity switching mechanism 400. The different modules and mechanisms are described below.
[0032] Understandably, this is to avoid the aforementioned problems.
[0033] In some embodiments, the control module 100 is used to generate multiple pulse signals, and the interlock mechanism 200 is connected to the control module 100 to receive the pulse signals sent by the control module 100. When all pulse signals are at the first level, the control module 100 converts the pulse signals to the second level to realize the interlock operation of the pulse signals, so as to pull down the pulse signals and obtain the interlock level signal, thereby further avoiding damage to the circuit.
[0034] It should be noted that in the embodiments of this application, the first level is a high level and the second level is a low level. Specifically, the first level corresponds to the control switch module being turned on, and the second level corresponds to the control switch module being turned off, which will be explained in detail below.
[0035] In some embodiments, the drive mechanism 300 is connected to the interlock mechanism 200 to receive the interlock level signal converted by the interlock mechanism 200, and amplify the interlock level signal to output a drive signal corresponding to the interlock level signal, thereby increasing the current and voltage driving force of the drive signal.
[0036] In some embodiments, the polarity switching mechanism 400 includes a switching module that corresponds one-to-one with the electrode of the product under test. The polarity switching mechanism 400 is used to receive the driving signal output by the driving mechanism 300 to adjust the switching state of the switching module. The first level corresponds to the level that controls the switching module to be turned on, and the second level corresponds to the level that controls the switching module to be turned off, thereby adjusting the switching state of the switching module and avoiding the situation where the switching modules are turned on at the same time.
[0037] Specifically, the polarity switching mechanism 400 is used to turn on the switching module when the drive signal is at the first level, and to turn off the switching module when the drive signal is at the second level.
[0038] It should be noted that the product under test in this application embodiment can be a battery, a solar panel, etc., wherein the battery can be a solar cell, a fuel cell, etc., and the product under test in this application embodiment can be applied to energy storage systems, electronic devices, power systems and other fields. This application embodiment does not impose specific limitations.
[0039] In some embodiments, the pulse signal includes a first pulse signal and a second pulse signal. The interlocking mechanism 200 is used to convert the first pulse signal and the second pulse signal to a second level when both the first pulse signal and the second pulse signal are at a first level. That is, the interlocking mechanism 200 pulls the first pulse signal and the second pulse signal low to obtain a first interlocking level signal corresponding to the first pulse signal and a second interlocking level signal corresponding to the second pulse signal, thereby simultaneously pulling the first pulse signal and the second pulse signal low to reduce the signal strength of the first pulse signal and the second pulse signal.
[0040] In some embodiments, the drive mechanism 300 is used to amplify the first interlock level signal and the second interlock level signal to obtain a first drive signal corresponding to the first interlock level signal and a second drive signal corresponding to the second interlock level signal, thereby amplifying the first interlock level signal and the second interlock level signal and increasing the current and voltage driving force of the first drive signal and the second drive signal.
[0041] In some embodiments, the switching module includes a first switching element connected to a first electrode of the product under test and a second switching element connected to a second electrode of the product under test. Taking the product under test as a battery as an example, the first electrode can be the positive electrode of the battery, and the second electrode can be the negative electrode of the battery. Similarly, the first electrode can also be the negative electrode of the battery, and the second electrode can also be the positive electrode of the battery, etc. Since the first level in this embodiment controls the switching module to open and the second level controls the switching module to close, the polarity switching mechanism 400 can close the first switching element and the second switching element when both the first pulse signal and the second pulse signal are at the second level, thereby achieving the closure of different switching elements and avoiding a battery short circuit caused by the simultaneous opening of the switching elements.
[0042] Please refer to Figure 2 , Figure 2 This is a circuit diagram of the interlocking mechanism 200 provided in the embodiments of this application.
[0043] In some embodiments, the interlocking mechanism 200 includes a first interlocking switch 210 and a second interlocking switch 220. The first interlocking switch 210 and the second interlocking switch 220 cooperate with each other to convert the first pulse signal and the second pulse signal into a second level, thereby realizing the interlocking operation of the pulse signal to pull down the level of the pulse signal.
[0044] Specifically, the first interlocking switch 210 includes a first resistor R1, a first switch Q1, and a second switch Q2. The second interlocking switch includes a second resistor R2, a third switch Q3, and a fourth switch Q4. One end of the first resistor R1 is connected to the control module 100, and the other end of the first resistor R1 is connected to the control pin of the first switch Q1. The first switch pin of the first switch Q1 is connected to a reference ground. The control pin of the second switch Q2 is connected between the control module 100 and the first resistor R1, and the second switch pin of the second switch Q2 is connected between the second resistor R2 and the first switch Q4. Between the control pins of the three switching transistors Q3, the third switching pin of the second switching transistor Q2 is connected to the reference ground, one end of the second resistor R2 is connected to the control module 100, the other end of the second resistor R2 is connected to the control pin of the third switching transistor Q3, the fourth switching pin of the third switching transistor Q3 is connected to the reference ground, the control pin of the fourth switching transistor Q4 is connected between the control module 100 and the second resistor R2, the fifth switching pin of the fourth switching transistor Q4 is connected between the first resistor R1 and the control pin of the first switching transistor Q1, and the sixth switching pin of the fourth switching transistor Q4 is connected to the reference ground.
[0045] In some embodiments, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are all transistors, diodes, MOSFETs, or insulated-gate bipolar transistors, thereby enabling effective protection of the product under test while achieving rapid real-time polarity switching.
[0046] It is understandable that, such as Figure 2 As shown, Figure 2 Taking the example where the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are all transistors, the base of the first switch Q1 is connected to the first resistor R1, and the collector of the first switch Q1 is connected to the reference ground. The base of the second switch Q2 is connected between the control module 100 and the first resistor R1, the emitter of the second switch Q2 is connected between the second resistor R2 and the base of the third switch Q3, and the collector of the second switch Q2 is connected to the reference ground. The base of the third switch Q3 is connected to the second resistor R2, and the collector of the third switch Q3 is connected to the reference ground. The base of the fourth switch Q4 is connected between the control module 100 and the second resistor R2, the emitter of the fourth switch Q4 is connected between the first resistor R1 and the base of the first switch Q1, and the collector of the fourth switch Q4 is connected to the reference ground.
[0047] When both the first pulse signal and the second pulse signal are at the first level, i.e., when both PWMA and PWMB are at the high level, the first switch Q1 and the third switch Q3 are turned on. The emitters of the first switch Q1 and the third switch Q3 are connected to the reference ground, making the voltage of the emitters close to the ground voltage. The second switch Q2 and the fourth switch Q4 are also turned on. The emitters of the second switch Q2 and the fourth switch Q4 are connected to the reference ground to pull down the first pulse signal and the second pulse signal, thereby realizing the interlocking operation of the first pulse signal and the second pulse signal.
[0048] In some embodiments, since a low-level pulse signal will not trigger the switching module in the polarity switching mechanism 400 to turn on, the interlocking mechanism 200 will maintain the level of all pulse signals when any pulse signal is at the second level. Taking the pulse signals including the first pulse signal and the second pulse signal as an example, the interlocking mechanism 200 is also used to maintain the level of the first pulse signal and the second pulse signal when the first pulse signal and / or the second pulse signal are at the second level, that is, when one or more of the first pulse signal and the second pulse signal are at a low level. Furthermore, the driving mechanism 300 is also used to output a third driving signal corresponding to the first pulse signal and a fourth driving signal corresponding to the second pulse signal.
[0049] It is understandable that when any pulse signal is low, the switching modules will not be simultaneously on, so there is no need to interlock the pulse signals.
[0050] Specifically, taking the first pulse signal as the first level and the second pulse signal as the second level as an example, since the second pulse signal is at the second level, the switching modules will not be simultaneously on. In this case, the interlock mechanism 200 will not be triggered to pull the first pulse signal and the second pulse signal low. The interlock mechanism 200 directly maintains the first level of the first pulse signal and the second level of the second pulse signal. The driving mechanism 300 outputs a third driving signal corresponding to the first pulse signal and a fourth driving signal corresponding to the second pulse signal to amplify the first pulse signal and the second pulse signal, so that the polarity switching mechanism 400 adjusts the switching state of the switching module based on the third driving signal and the fourth driving signal.
[0051] In some embodiments, the first switching element is a MOSFET or a relay, and the second switching element is also a MOSFET or a relay. When the drive signal is transmitted to the switching module, the signal switches the polarity state by driving different switching elements, thereby achieving a fast polarity switching function.
[0052] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the battery production system provided in the embodiments of this application.
[0053] In some embodiments, this application also provides a battery production system, which includes the polarity switching device as described above. The specific implementation of the battery production system is basically the same as the specific implementation of the polarity switching device described above, and will not be repeated here.
[0054] It is worth noting that the battery production system in this application embodiment can be a battery production line, a battery assembly line, etc., and this application embodiment does not impose specific limitations.
[0055] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
[0056] It will be understood by those skilled in the art that Figures 1 to 3 The technical solutions shown herein do not constitute a limitation on the embodiments of this application.
[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0058] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.
[0059] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0060] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0061] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.
Claims
1. A polarity switching device, characterized in that, include: The control module is used to generate multiple pulse signals; An interlocking mechanism, connected to the control module, converts the pulse signals to a second level when all the pulse signals are at the first level, thereby obtaining an interlocking level signal; A drive mechanism is connected to the interlock mechanism, and the drive mechanism is used to output a drive signal corresponding to the interlock level signal; The polarity switching mechanism includes a switching module that corresponds one-to-one with the electrode of the product under test. The polarity switching mechanism is used to receive the driving signal output by the driving mechanism to adjust the switching state of the switching module. The first level corresponds to the level that controls the switching module to be turned on, and the second level corresponds to the level that controls the switching module to be turned off.
2. The polarity switching device according to claim 1, characterized in that, The pulse signal includes a first pulse signal and a second pulse signal. The interlocking mechanism is used to convert the first pulse signal and the second pulse signal into a second level when both the first pulse signal and the second pulse signal are at a first level, so as to obtain a first interlocking level signal corresponding to the first pulse signal and a second interlocking level signal corresponding to the second pulse signal.
3. The polarity switching device according to claim 2, characterized in that, The driving mechanism is used to amplify the first interlock level signal and the second interlock level signal to obtain a first driving signal corresponding to the first interlock level signal and a second driving signal corresponding to the second interlock level signal.
4. The polarity switching device according to claim 2, characterized in that, The interlocking mechanism includes a first interlocking switch and a second interlocking switch, which cooperate with each other to convert the first pulse signal and the second pulse signal into a second level.
5. The polarity switching device according to claim 2, characterized in that, The switching module includes a first switching element connected to a first electrode of the product under test and a second switching element connected to a second electrode of the product under test; the polarity switching mechanism is used to turn off the first switching element and the second switching element when both the first pulse signal and the second pulse signal are at the second level.
6. The polarity switching device according to claim 2, characterized in that, The interlocking mechanism is also used to maintain the levels of the first pulse signal and the second pulse signal when the first pulse signal and / or the second pulse signal are at the second level; The driving mechanism is further configured to output a third driving signal corresponding to the first pulse signal and a fourth driving signal corresponding to the second pulse signal when the first pulse signal and / or the second pulse signal are at a second level.
7. The polarity switching device according to claim 4, characterized in that, The first interlocking switch includes a first resistor, a first switching transistor, and a second switching transistor. The second interlocking switch includes a second resistor, a third switching transistor, and a fourth switching transistor. One end of the first resistor is connected to the control module, and the other end of the first resistor is connected to the control pin of the first switching transistor. The first switching pin of the first switching transistor is connected to a reference ground. The control pin of the second switching transistor is connected between the control module and the first resistor. The second switching pin of the second switching transistor is connected between the second resistor and the control pin of the third switching transistor. The third switching pin of the second switching transistor is connected to a reference ground. One end of the second resistor is connected to the control module, and the other end of the second resistor is connected to the control pin of the third switching transistor. The fourth switching pin of the third switching transistor is connected to a reference ground. The control pin of the fourth switching transistor is connected between the control module and the second resistor. The fifth switching pin of the fourth switching transistor is connected between the first resistor and the control pin of the first switching transistor. The sixth switching pin of the fourth switching transistor is connected to a reference ground.
8. The polarity switching device according to claim 7, characterized in that, The first switch, the second switch, the third switch, and the fourth switch are all one of the following: transistor, diode, MOSFET, or insulated gate bipolar transistor.
9. The polarity switching device according to claim 5, characterized in that, The first switching device is a MOSFET or a relay, and the second switching device is a MOSFET or a relay.
10. A battery production system, characterized in that, Includes the polarity switching device as described in any one of claims 1 to 9.