Switching MOS module isolation circuit and lithium battery
By designing the switch MOS module isolation circuit in the lithium battery management system, the problems of unreasonable current loop layout and large current loop interference signal loops in the existing technology are solved, module isolation and loop separation are realized, and cell arrangement flexibility and system stability are improved.
Patent Information
- Application Number
- CN202421427340.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-20
AI Technical Summary
In the existing lithium battery management system, information acquisition modules such as battery voltage, current, and temperature, signal control modules and high-current power circuit modules are usually integrated on the same printed circuit board, resulting in a reasonable and efficient current circuit that cannot be formed when the battery end is far apart or the battery cell is unreasonable, and the large current circuit interferes with the signal circuit.
A switch MOS module isolation circuit is designed, and the module isolation is realized by separate the MOS drive module into an independent control system. The isolation circuit is formed by a charging control tube, a discharge control tube and a sampling resistor to separate the high-current loop and the signal control loop.
The module isolation is realized, the cell arrangement flexibility is improved, the interference between loops is reduced, the current loop can be flexibly planned, and the overcurrent uniformity of the charge and discharge tubes is better controlled.
Smart Images
Figure CN222827229U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery technology, and in particular to a switch MOS module isolation circuit and a lithium battery. Background Art
[0002] Usually, the lithium battery management system (BMS) collects information such as battery cell voltage, current, temperature, etc., and controls the battery charging and discharging actions through the switch MOS to ensure that the battery is used in a safe and reliable state. It generally includes an information acquisition module, a signal control module, and a high-current power circuit module controlled by the switch MOS. Currently, products on the market generally integrate these modules on the same printed circuit board. When the battery terminal (B+ / B-) and the charging and discharging port (P+ / P-) on the BMS structural frame are far apart, or the positive terminal (B+) and negative terminal (B-) of the battery are not on the same plane in the battery cell arrangement, a reasonable and efficient current circuit cannot be formed, the layout of the power circuit cannot be flexibly handled, and there is interference from the large current circuit to the signal circuit.
[0003] Therefore, it is necessary to design a circuit for isolating a large current loop and a signal control loop. Utility Model Content
[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a switch MOS module isolation circuit and a lithium battery that can separate a large current loop and a signal control loop and reduce interference between the loops.
[0005] The purpose of this disclosure is achieved through the following technical solutions:
[0006] A switch MOS module isolation circuit, comprising:
[0007] MOS driver module;
[0008] An analog front end, wherein the analog front end is provided with an information sampling module and a signal control module, the signal control module is used to provide a control signal, and the connection end of the MOS driving module is electrically connected to the analog front end;
[0009] A charging control tube and a discharging control tube, wherein the first end of the charging control tube is used to connect to the positive electrode of the battery, the second end of the charging control tube is connected to the first end of the discharging control tube, the control end of the charging control tube is connected to the first end of the MOS driving module, the second end of the discharging control tube is used to connect to the charging and discharging positive electrode, and the control end of the discharging control tube is connected to the second end of the MOS driving module; and,
[0010] A sampling resistor, wherein the first end of the sampling resistor is used to connect to the negative electrode of the battery, and the first end of the sampling resistor is also connected to the first end of the information sampling module, and the second end of the sampling resistor is used to connect to the negative electrode of the charge and discharge, and the second end of the sampling resistor is also connected to the second end of the information sampling module.
[0011] In one embodiment, the charging control tube is an N-type MOS tube.
[0012] In one of the embodiments, the model of the charging control tube is CSD17313Q2.
[0013] In one embodiment, the charging control tube is a P-type MOS tube.
[0014] In one embodiment, the discharge control tube is an N-type MOS tube.
[0015] In one of the embodiments, the model of the discharge control tube is BSS138LT1G.
[0016] In one embodiment, the discharge control tube is a P-type MOS tube.
[0017] In one embodiment, the sampling resistor is a variable resistor.
[0018] In one embodiment, the resistance value of the sampling resistor ranges from 8 kΩ to 10 kΩ.
[0019] A lithium battery comprises the switch MOS module isolation circuit described in any one of the above embodiments.
[0020] Compared with the prior art, the present invention has at least the following advantages:
[0021] When designing the switch MOS module isolation circuit, the MOS drive module is separated as an independent control system to achieve module isolation and improve the flexibility of battery cell arrangement. Regardless of the position of the positive / negative pole of the battery, it can be connected through wires. The current loop of the system can be flexibly planned; the uniformity of the overcurrent of the charging control tube and the discharge control tube can also be better controlled; at the same time, the large current loop of the system (that is, the loop of the MOS drive module) and the signal control loop can be separated to reduce the interference of the large current loop on the signal loop. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A circuit diagram of a switch MOS module isolation circuit in an embodiment;
[0024] Figure 2 for Figure 1 The circuit schematic diagram of the switching MOS module isolation circuit is shown.
[0025] Reference numerals:
[0026] 10. Switch MOS module isolation circuit; 100. MOS driving module; 200. Analog front end; 210. Information sampling module; 220. Signal control module; QC1. Charging control tube; QD1. Discharging control tube; RS1. Sampling resistor. DETAILED DESCRIPTION
[0027] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.
[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0030] The present invention discloses a switch MOS module isolation circuit, comprising a MOS drive module, an analog front end, a charge control tube, a discharge control tube and a sampling resistor.
[0031] The analog front end is provided with an information sampling module and a signal control module, the signal control module is used to provide a control signal, and the connection end of the MOS driver module is electrically connected to the analog front end; the first end of the charging control tube is used to connect to the positive electrode of the battery, the second end of the charging control tube is connected to the first end of the discharging control tube, the control end of the charging control tube is connected to the first end of the MOS driver module, the second end of the discharging control tube is used to connect to the charging and discharging positive electrode, and the control end of the discharging control tube is connected to the second end of the MOS driver module; the first end of the sampling resistor is used to connect to the negative electrode of the battery, the first end of the sampling resistor is also connected to the first end of the information sampling module, the second end of the sampling resistor is used to connect to the charging and discharging negative electrode, and the second end of the sampling resistor is also connected to the second end of the information sampling module. When designing the switch MOS module isolation circuit, the MOS driver module is separated separately as an independent control system to achieve module isolation and improve the flexibility of battery cell arrangement. Regardless of the position of the positive / negative electrode of the battery, it can be connected through a wire. The system's current loop can be flexibly planned; the uniformity of the overcurrent of the charging control tube and the discharging control tube can also be better controlled; at the same time, the system's large current loop and signal control loop can be separated to reduce the interference of the large current loop on the signal loop.
[0032] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:
[0033] See also Figure 1 , which is a switch MOS module isolation circuit 10 according to an embodiment of the present invention.
[0034] The switch MOS module isolation circuit 10 includes a MOS driver module 100, an analog front end 200, a charge control tube QC1, a discharge control tube QD1 and a sampling resistor RS1. The analog front end 200 is provided with an information sampling module 210 and a signal control module 220, the signal control module 220 is used to provide a control signal, and the MOS driver module 100 is electrically connected to the analog front end 200; the first end of the charge control tube QC1 is used to connect to the positive electrode of the battery, the second end of the charge control tube QC1 is connected to the first end of the discharge control tube QD1, the control end of the charge control tube QC1 is connected to the first end of the MOS driver module 100, the second end of the discharge control tube QD1 is used to connect to the positive electrode of the charge and discharge, and the control end of the discharge control tube QD1 is connected to the second end of the MOS driver module 100; the first end of the sampling resistor RS1 is used to connect to the negative electrode of the battery, the first end of the sampling resistor RS1 is also connected to the first end of the information sampling module 210, the second end of the sampling resistor RS1 is used to connect to the negative electrode of the charge and discharge, and the second end of the sampling resistor RS1 is also connected to the second end of the information sampling module 210.
[0035] Among them, the first end of the MOS driving module 100 is used to control the conduction state of the charging control tube QC1 through the voltage of the control end of the charging control tube QC1, the second end of the MOS driving module 100 is used to control the conduction state of the discharging control tube QD1 through the voltage of the control end of the discharging control tube QD1, the first end of the sampling resistor RS1 and the first end of the information sampling module 210 constitute the negative end of the sampling resistor, the second end of the sampling resistor RS1 and the second end of the information sampling module 210 constitute the positive end of the sampling resistor, and the two ends of the information sampling module 210 are connected to the two ends of the sampling resistor RS1 to collect current and voltage information.
[0036] In this embodiment, when designing the switch MOS module isolation circuit 10, the MOS driving module 100 is separated as an independent control system to achieve module isolation and improve the flexibility of battery cell arrangement. Regardless of the position of the positive / negative pole of the battery, it can be connected by wires. The current loop of the system can be flexibly planned; the uniformity of the overcurrent of the charging control tube QC1 and the discharge control tube QD1 can also be better controlled; at the same time, the large current loop and the signal control loop of the system can be separated to reduce the interference of the large current loop on the signal loop.
[0037] Understandably, combined Figure 1 and Figure 2 As shown, the control of the charging control tube QC1 and the discharging control tube QD1 is an external input signal, mainly the driving signal of the MOS driving module 100, and the information sampling module 210 receives the voltage signal of the sampling resistor RS1, that is, the output signal, and the signal control module 220 is used to connect any component such as a resistor, a triode, a MOS tube, etc., as a control signal. After the MOS driving module 100 is separated, it is used as an independent control system. In this way, the overall current loop of the BMS can be shortened, the uniformity of the overcurrent of the charging control tube QC1 and the discharging control tube QD1 can be better controlled, and the large current loop of the system (that is, the driving loop of the MOS driving module 100) and the control loop of the signal control module 220 are separated, and the interference of the large current loop to other control signal loops is reduced.
[0038] In this embodiment, the charging control tube QC1 is an N-type MOS tube, wherein the first end of the charging control tube QC1 is a source, the second end is a drain, and the control end is a gate.
[0039] Furthermore, the model of the charging control tube QC1 is CSD17313Q2. Of course, in other embodiments, the model of the charging control tube QC1 can be any one of IRLHM620PBF, IRLML2502TRPBF, and SI2312DS.
[0040] Of course, the charging control tube QC1 is not limited to an N-type MOS tube. In another embodiment, the charging control tube QC1 is a P-type MOS tube (not shown in the figure), so that the MOS driving module controls the switching state of the P-type MOS tube through its first end.
[0041] In this embodiment, the discharge control tube QD1 is an N-type MOS tube, wherein the first end of the discharge control tube QD1 is a drain, the second end is a source, and the control end is a gate.
[0042] Furthermore, the model of the discharge control tube QD1 is BSS138LT1G. Of course, in other embodiments, the model of the discharge control tube QD1 can be any one of BSH103, CSD17313Q2, and IRFR4104TRPBF.
[0043] Of course, the discharge control tube QD1 is not limited to an N-type MOS tube. In another embodiment, the discharge control tube QD1 is a P-type MOS tube (not shown in the figure), so that the MOS driving module controls the switching state of the P-type MOS tube through its second end.
[0044] It should be noted that, in order to make the charging control tube QC1 and the discharging control tube QD1 work normally, a plurality of resistors are usually connected in series to any end of the charging control tube QC1 and the discharging control tube QD1 to protect the charging control tube QC1 and the discharging control tube QD1. Figure 1 and Figure 2 For simplicity of illustration, resistors are not shown.
[0045] In one embodiment, the sampling resistor RS1 is a variable resistor. It can be understood that when the sampling resistor RS1 is a variable resistor, the resistance value of the sampling resistor RS1 is adjusted to adjust the current between the negative electrode of the battery and the negative electrode of the charge and discharge, and the voltage across the sampling resistor RS1 is adjusted to further control the state of the output signal.
[0046] In one embodiment, the resistance value of the sampling resistor RS1 ranges from 8 kΩ to 10 kΩ. In this embodiment, the resistance value of the sampling resistor RS1 is 10 kΩ.
[0047] The present disclosure also provides a lithium battery, including the switch MOS module isolation circuit 10 of any one of the above embodiments. Further, the lithium battery can be a portable energy storage lithium battery. When the lithium battery adopts the switch MOS module isolation circuit 10, the circuit can separate the MOS driving module 100 from other modules, reduce the interference of the circuit of the MOS driving module 100 on other signal circuits, and ensure the normal operation of the lithium battery.
[0048] Compared with the prior art, the present invention has at least the following advantages:
[0049] When designing the switch MOS module isolation circuit 10, the MOS driving module 100 is separated as an independent control system to achieve module isolation and improve the flexibility of battery cell arrangement. Regardless of the position of the positive / negative pole of the battery, it can be connected through wires. The current loop of the system can be flexibly planned; the uniformity of the overcurrent of the charging control tube QC1 and the discharge control tube QD1 can also be better controlled; at the same time, the large current loop and the signal control loop of the system can be separated to reduce the interference of the large current loop on the signal loop.
[0050] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.
Claims
1. A switch MOS module isolation circuit, characterized in that: include: MOS driver module; An analog front end, wherein the analog front end is provided with an information sampling module and a signal control module, the signal control module is used to provide a control signal, and the connection end of the MOS driving module is electrically connected to the analog front end; A charging control tube and a discharging control tube, wherein the first end of the charging control tube is used to connect to the positive electrode of the battery, the second end of the charging control tube is connected to the first end of the discharging control tube, the control end of the charging control tube is connected to the first end of the MOS driving module, the second end of the discharging control tube is used to connect to the charging and discharging positive electrode, and the control end of the discharging control tube is connected to the second end of the MOS driving module; and, A sampling resistor, wherein the first end of the sampling resistor is used to connect to the negative electrode of the battery, and the first end of the sampling resistor is also connected to the first end of the information sampling module, and the second end of the sampling resistor is used to connect to the negative electrode of the charge and discharge, and the second end of the sampling resistor is also connected to the second end of the information sampling module.
2. The switch MOS module isolation circuit according to claim 1, characterized in that: The charging control tube is an N-type MOS tube.
3. The switch MOS module isolation circuit according to claim 1, characterized in that: The model of the charging control tube is CSD17313Q2.
4. The switch MOS module isolation circuit according to claim 1, characterized in that: The charging control tube is a P-type MOS tube.
5. The switch MOS module isolation circuit according to claim 1, characterized in that: The discharge control tube is an N-type MOS tube.
6. The switch MOS module isolation circuit according to claim 1, characterized in that: The model of the discharge control tube is BSS138LT1G.
7. The switch MOS module isolation circuit according to claim 1, characterized in that: The discharge control tube is a P-type MOS tube.
8. The switch MOS module isolation circuit according to claim 1, characterized in that: The sampling resistor is a variable resistor.
9. The switch MOS module isolation circuit according to claim 1, characterized in that: The resistance value of the sampling resistor ranges from 8 kΩ to 10 kΩ.
10. A lithium battery, characterized in that: A switch MOS module isolation circuit comprising any one of claims 1-9.