Circuit protection board for battery management device
The combination of the dual charge and discharge protection module and the CW1051A chip solves the problem of the battery management device's circuit protection board being too large, achieving dual protection while reducing size and improving adaptability.
Patent Information
- Application Number
- CN202422597290.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-28
AI Technical Summary
The circuit protection board of the existing battery management device is large in size, resulting in poor adaptability and difficulty in use in smaller electronic devices.
A dual charge and discharge protection module is used, including a first charge and discharge protection module and a second charge and discharge protection module. Combined with the CW1051A chip and detection module, the battery pack is protected through multiple battery positive and negative connection terminals, reducing the size of the circuit protection board.
It achieves double protection while effectively reducing the size of the circuit protection board, improving adaptability and being suitable for more types of electronic equipment.
Smart Images
Figure CN223348400U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery management devices, in particular to a circuit protection board used for battery management devices. Background Art
[0002] Some existing electronic devices are equipped with battery management devices for charging and discharging protection of the electronic devices. However, the existing technology generally has the problem that the protection circuit is relatively simple and cannot perform charge and discharge protection well; and in circuit boards with more protection circuits, a larger circuit board size is required to support it, resulting in a larger volume space occupied by the electronic device. In some electronic devices with smaller volume spaces, the circuit board is difficult to place, resulting in poor adaptability. Utility Model Content
[0003] The purpose of the utility model is to provide a circuit protection board that can not only provide dual protection for the charging and discharging of a battery management device but also effectively reduce the size of the circuit board, thereby effectively protecting the charging and discharging of the battery management device while improving the adaptability of the circuit protection board.
[0004] The utility model solves the technical problem by providing a circuit protection board for a battery management device, comprising:
[0005] A battery interface, of which multiple are provided and used to connect to each battery in the battery pack;
[0006] A first charge and discharge protection module includes a first power interface and a plurality of first battery positive and negative connection terminals, wherein the first power interface is used to connect to an external power source and is electrically connected to each of the first battery positive and negative connection terminals; each of the first battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence;
[0007] The second charge and discharge protection module includes a second power interface, a first transistor, and a plurality of second battery positive and negative connection terminals; the second power interface is respectively connected to the external power source and the first transistor, and is electrically connected to each of the second battery positive and negative connection terminals, and the first transistor is also connected to the first power interface; each of the second battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence, and the second charge and discharge protection module is a CW1051A model chip;
[0008] A detection module is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
[0009] Furthermore, the detection module includes a first voltage stabilizing diode, a second voltage stabilizing diode, a second transistor, a first field effect transistor and a second field effect transistor, the first charge and discharge protection module is respectively connected to the first voltage stabilizing diode, the second transistor and the first field effect transistor, and the second field effect transistor is respectively connected to the first field effect transistor, the second transistor and the second voltage stabilizing diode.
[0010] Furthermore, the detection module further includes a third field effect transistor and a third voltage stabilizing diode, and the third field effect transistor is connected to the third voltage stabilizing diode, the first transistor and the second field effect transistor respectively.
[0011] Furthermore, the detection module also includes a circuit breaker, which is connected to the first charge and discharge protection module and the first field effect transistor respectively.
[0012] Furthermore, the first charge and discharge protection module further includes an overcurrent detection terminal, and the overcurrent detection terminal is connected to the circuit breaker and the first field effect transistor respectively.
[0013] Furthermore, the first charge and discharge protection module also includes a third triode, a fourth triode and a fifth triode, and the third triode, the fourth triode and the fifth triode are connected to each of the battery interfaces and each of the positive and negative connection terminals of the first battery in a one-to-one correspondence.
[0014] Furthermore, the first charge and discharge protection module also includes a first charge control terminal and a discharge control terminal, the first charge control terminal is connected to the second transistor, and the discharge control terminal is respectively connected to the first voltage regulator diode, the first field effect transistor and the circuit breaker.
[0015] Furthermore, the second charge and discharge protection module further includes a second charge control terminal, and the second charge control terminal is connected to the first transistor.
[0016] Furthermore, the circuit protection board further includes a thermal detection module, and the thermal detection module is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
[0017] On the other hand, a battery device for a projector includes the battery protection board described in the above technical solution and multiple batteries, and the battery protection board is connected to each of the batteries through multiple battery interfaces.
[0018] The beneficial effects of the utility model are:
[0019] The utility model provides a circuit protection board for a battery management device, which is used to charge and discharge with an external power source through a first power interface in a first charge and discharge protection module, and then performs primary protection on each battery in the battery pack by connecting each first battery positive and negative connection terminal to each battery interface in a one-to-one correspondence, so that the charging and discharging between the external power source and the battery pack are effectively protected by the first charge and discharge protection module.
[0020] Furthermore, charging and discharging with an external power supply are performed through the second power supply interface in the second charge and discharge protection module. At the same time, due to the inherent functions of the CW1051A chip, only one transistor combined with the detection module is required to achieve effective charge and discharge protection for multiple batteries in the battery pack. Compared with the protection circuit in the prior art that requires multiple transistors and results in a larger overall size, the utility model can effectively reduce the size of the circuit protection board and can be adapted to electronic equipment of more sizes and specifications. It has good size adaptability while providing double protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief description of the drawings required for describing the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of them. Those skilled in the art can also derive other design solutions and drawings based on these drawings without inventive effort.
[0022] Figure 1 This is an overall block diagram of the circuit protection board proposed in an embodiment of the utility model;
[0023] Figure 2 A specific circuit diagram of the circuit protection board proposed in an embodiment of the utility model;
[0024] Figure 3 This is a specific pin diagram of the first charge and discharge protection module proposed in an embodiment of the present utility model;
[0025] Figure 4 This is a specific pin diagram of the second charge and discharge protection module proposed in an embodiment of the present utility model. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0027] It should be noted that although the system diagrams illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the system or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.
[0028] refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , Figure 1 This is the overall block diagram of this circuit protection board; Figure 2 Specific circuit diagram for the circuit protection board; Figure 3 This is the specific pin diagram of the first charge and discharge protection module. Figure 4 This is the specific pin diagram of the second charge and discharge protection module.
[0029] Figure 2 The pins of U2 can be Figure 3 In the figure, VDD, VC4, VC3, VC2, VC1, VC0, VSS, CS, DO, CO, VM, SEL, RUT, RCOT, RDOT and CIT represent pins 1 to 16 of U2 respectively for the convenience of description; then Figure 2 The 1-8 pins of U1 are Figure 4 VCC, VC5, VC4, VC3, VC2, VC1, VC0, and CO in it.
[0030] The main purpose of this application is to effectively reduce the size of the circuit protection board to adapt to electronic equipment of more sizes and specifications, and to provide dual charging and discharging protection through the first charging and discharging protection module and the second charging and discharging protection module, so as to achieve the good effect of double protection while also having good size adaptability.
[0031] To this end, in one aspect, the present application provides a circuit protection board for a battery management device, comprising:
[0032] A battery interface, of which multiple are provided and used to connect to each battery in the battery pack;
[0033] A first charge and discharge protection module includes a first power interface and a plurality of first battery positive and negative connection terminals, wherein the first power interface is used to connect to an external power source and is electrically connected to each of the first battery positive and negative connection terminals; each of the first battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence;
[0034] The second charge and discharge protection module includes a second power interface, a first transistor, and a plurality of second battery positive and negative connection terminals; the second power interface is respectively connected to the external power source and the first transistor, and is electrically connected to each of the second battery positive and negative connection terminals, and the first transistor is also connected to the first power interface; each of the second battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence, and the second charge and discharge protection module is a CW1051A model chip;
[0035] A detection module is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
[0036] In this embodiment of the present invention, there are three battery interfaces. It should be noted that in other embodiments, the number of battery interfaces can be set according to actual needs, such as 5, 6, 7, etc., and the number of battery interfaces is not limited here. The number of battery interfaces is consistent with the number of batteries. This application uses a battery pack containing three single cells as an example, and is provided with three battery interfaces. The battery interfaces can be connected to the batteries, and then charged and discharged with an external power source.
[0037] The model of the entire circuit protection board can be specifically A6-JY-2638-3S, and the first charge and discharge protection module is specifically composed of a chip with a model number of CW1244, that is, Figure 2 U2 in the figure is the main control part of the module, which combines multiple transistors, resistors and capacitors to form an overall charge and discharge protection module.
[0038] Among them, you can refer to Figure 2 and Figure 3 As shown, the first power interface is Figure 2 Pin 1 in U2, that is Figure 3 The VDD pin in the first battery is connected to the positive and negative terminals of the battery. Figure 2 Pins 3-6 of U2 are connected to the positive and negative poles of multiple battery interfaces respectively.
[0039] The second charging protection module includes a second power interface, a first transistor Q1 and a plurality of second battery positive and negative connection terminals, wherein the second charging protection module also includes a charge and discharge protection terminal ( Figure 4 The first transistor Q1 is provided between the second power interface and the charge and discharge protection terminal ( Figure 4 CO in the charge and discharge protection terminals ( Figure 4After the circuit where the CO in the circuit is located detects an overcurrent signal, the first transistor Q1 is turned off, thereby cutting off the electrical connection between the second power interface and the external power supply, thereby achieving charge and discharge protection for the three batteries. Compared with existing solutions that use other circuit solutions, such as other types of chips combined with multiple transistors to achieve charge and discharge protection, the present invention can effectively solve the problem of the large size of the circuit protection board caused by existing solutions.
[0040] A detection module is also proposed in the embodiment of the present invention. The detection module can realize the detection of circuit parameters such as discharge overcurrent protection current (6.25A±1A), short-circuit protection current (25A±2.5A), charge overcurrent protection current (6.25A±1A), balancing detection voltage (4.075±25mV), and balancing current (0-50mA). The values in brackets represent the normal range parameters under normal charging and discharging conditions of the circuit. If the parameters are exceeded, the detection module will detect it and cut off one or more circuit devices in the detection module. Combined with the detection terminals in CW1244 in the first charge and discharge protection module and CW1051A in the second charge and discharge protection module, the overall circuit charging and discharging protection operation is performed.
[0041] Furthermore, the detection module includes a first voltage stabilizing diode ZD3, a second voltage stabilizing diode ZD2, a second transistor Q2, a first field-effect transistor Q5 and a second field-effect transistor Q6; the first charge and discharge protection module is respectively connected to the first voltage stabilizing diode ZD3, the second transistor Q2 and the first field-effect transistor Q5; the second field-effect transistor Q6 is respectively connected to the first field-effect transistor Q5, the second transistor Q2 and the second voltage stabilizing diode ZD2.
[0042] Specifically, the cathode of the first voltage stabilizing diode ZD3 is connected to the 9th pin of the first charge and discharge protection module through the resistor R19, and the cathode of ZD3 is also connected to the gate of the first field effect transistor Q5. Figure 3 and Figure 2 The DO pin in the circuit breaker is a discharge protection output terminal for push-pull output. The first voltage stabilizing diode ZD3 is also connected in parallel with the resistor R24, and the anode of the first voltage stabilizing diode ZD3 is connected to the circuit breaker LR1 in the detection module.
[0043] Furthermore, the emitter of the second transistor Q2 is connected to the 10th pin of U2 through the resistor R16, that is, Figure 3 The CO pin in the figure represents the charge protection output terminal, which is used for push-pull output. The base of the second transistor Q2 is grounded through resistor R21. The collector of the second transistor Q2 is connected to the anode of the first diode D2. The cathode of the first diode D2 is also connected to the gate of the second field-effect transistor Q6.
[0044] Furthermore, the detection module further includes a third field effect transistor Q7 and a third voltage stabilizing diode ZD1 , and the third field effect transistor Q7 is connected to the third voltage stabilizing diode ZD1 , the first transistor Q1 , and the second field effect transistor Q6 , respectively.
[0045] Specifically, the drain of the third field effect transistor Q7 is connected to the source of the second field effect transistor Q6, the gate of the second field effect transistor Q7 is connected to the cathode of the second diode D1 and also connected to the anode of the third voltage zener diode ZD1, the cathode of the second diode D1 is also connected to the cathode of the third voltage zener diode ZD1, and the anode of the second diode D1 is also connected to the collector of the first transistor Q1.
[0046] Furthermore, the detection module further includes a circuit breaker LR1 , and the circuit breaker LR1 is connected to the first charge and discharge protection module and the first field effect transistor Q5 respectively.
[0047] Specifically, the circuit breaker LR1 is connected to pin 5 (VC1) of U2. The circuit breaker LR1 can cut off the power supply to pin 5 of the first charge and discharge module, thereby preventing the battery from being charged or discharged when the current or voltage is too large.
[0048] Furthermore, the first charge and discharge protection module further includes an overcurrent detection terminal CS, and the overcurrent detection terminal CS is connected to the circuit breaker LR1 and the first field effect transistor Q5 respectively.
[0049] Specifically, the overcurrent detection terminal is Figure 2 Pin 8 in U2, i.e. Figure 3 The CS in the circuit is used to cut off the circuit through the circuit breaker LR1 when the current is too large, and is used to cut off the power supply of the first charge and discharge protection module and the second charge and discharge protection module. The voltage after the cut-off can also be used to control whether the current of the first field effect transistor Q5 is turned on or off, thereby further effectively protecting the charge and discharge.
[0050] Furthermore, the first charge and discharge protection module also includes a third transistor Q3, a fourth transistor Q4 and a fifth transistor Q8, and the third transistor Q3, the fourth transistor Q4 and the fifth transistor Q8 are connected to each of the battery interfaces and each of the positive and negative connection terminals of the first battery in a one-to-one correspondence.
[0051] Specifically, if Figure 2As shown, B- and B1, B1 and B2, and B and B+ are the positive and negative electrodes of the three single batteries, respectively. B1, B2, and B+ are the positive electrodes of the three batteries, respectively connected to the emitters of the third transistor Q3, the fourth transistor Q4, and the fifth transistor Q8, while the collectors of the third transistor Q3, the fourth transistor Q4, and the fifth transistor Q8 are respectively connected to B-, B1, and B. The bases of the third transistor Q3, the fourth transistor Q4, and the fifth transistor Q8 are respectively connected to pins 5, 4, and 3 of U2.
[0052] Furthermore, the first charge and discharge protection module further includes a first charge control terminal and a discharge control terminal, the first charge control terminal is connected to the second transistor Q2, and the discharge control terminal is respectively connected to the first voltage regulator diode ZD3, the first field effect transistor Q5 and the circuit breaker LR1.
[0053] Specifically, the first charging control terminal (pin 10) is Figure 3 and Figure 2 CO in U2, discharge control terminal (pin 9) is Figure 3 and Figure 2 The specific connection relationship of the DO pin in U2 is as shown above. The circuit breaking operation can be achieved through the connection relationship between the first charging control terminal and the discharging control terminal and the first voltage regulator diode ZD3, the first field effect transistor Q5 and the circuit breaker LR1.
[0054] Furthermore, the second charge and discharge protection module further includes a second charge control terminal, and the second charge control terminal is connected to the first transistor Q1.
[0055] Specifically, the second charging control terminal is pin 8 in U1, that is, Figure 4 and Figure 2 The CO pin shown by U1, the second charging control terminal CO is connected to the base of the first transistor Q1 through the resistor R3.
[0056] Furthermore, the circuit protection board further includes a thermal detection module NTC, and the thermal detection module NTC is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
[0057] Specifically, the thermistor module NTC is an integrated module, which is connected to pin 8 of U2 through capacitors C11 and C12. That is, when the temperature of the battery management device exceeds the set range, it can be detected by the thermistor module NTC and a corresponding signal can be sent to pin 8 of U2 to cut off the power supply in time when the temperature is too high to prevent dangerous situations.
[0058] It should be noted that, in the present invention, a plurality of capacitors are conventionally provided between the leads of U1 and U2, which is a conventional arrangement in the art. Therefore, some conventional capacitors are not displayed or marked in the drawings.
[0059] Among them, the first charge and discharge protection module also includes 3, 4 string application selection terminals SEL, low temperature detection resistor connection terminal RUT, charging overtemperature detection resistor connection terminal RCOT, discharge overtemperature detection resistor connection terminal RDOT and delay setting terminal CIT. The specific connection relationship can be as follows Figure 2 As shown, they are not described here. Their functions and effects are respectively low temperature detection, charging overtemperature detection, discharging overtemperature detection and delay setting.
[0060] On the other hand, a battery device for a projector includes the battery protection board described in the above technical solution and multiple batteries, and the battery protection board is connected to each of the batteries through multiple battery interfaces.
[0061] Specifically, the circuit protection board in this embodiment is mainly used for the battery device of the projector. Since the size of the projector is small, the highly integrated circuit protection board of this application can effectively reduce the size of the circuit protection board and perform dual protection of charging and discharging.
[0062] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A circuit protection board for a battery management device, characterized in that: include: A battery interface, of which multiple are provided and used to connect to each battery in the battery pack; A first charge and discharge protection module includes a first power interface and a plurality of first battery positive and negative connection terminals, wherein the first power interface is used to connect to an external power source and is electrically connected to each of the first battery positive and negative connection terminals; each of the first battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence; The second charge and discharge protection module includes a second power interface, a first transistor, and a plurality of second battery positive and negative connection terminals; the second power interface is respectively connected to the external power source and the first transistor, and is electrically connected to each of the second battery positive and negative connection terminals, and the first transistor is also connected to the first power interface; each of the second battery positive and negative connection terminals is connected to each of the battery interfaces in a one-to-one correspondence, and the second charge and discharge protection module is a CW1051A model chip; A detection module is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
2. The circuit protection board according to claim 1, wherein: The detection module includes a first voltage-stabilizing diode, a second voltage-stabilizing diode, a second transistor, a first field-effect transistor, and a second field-effect transistor. The first charge and discharge protection module is respectively connected to the first voltage-stabilizing diode, the second transistor, and the first field-effect transistor. The second field-effect transistor is respectively connected to the first field-effect transistor, the second transistor, and the second voltage-stabilizing diode.
3. The circuit protection board according to claim 2, characterized in that: The detection module further includes a third field effect transistor and a third voltage stabilizing diode, and the third field effect transistor is connected to the third voltage stabilizing diode, the first transistor, and the second field effect transistor respectively.
4. The circuit protection board according to claim 3, characterized in that: The detection module further includes a circuit breaker, which is connected to the first charge and discharge protection module and the first field effect transistor respectively.
5. The circuit protection board according to claim 4, characterized in that: The first charge and discharge protection module further includes an overcurrent detection terminal, which is connected to the circuit breaker and the first field effect transistor respectively.
6. The circuit protection board according to claim 5, characterized in that: The first charge and discharge protection module further includes a third triode, a fourth triode and a fifth triode, and the third triode, the fourth triode and the fifth triode are connected to each of the battery interfaces and each of the positive and negative connection terminals of the first battery in a one-to-one correspondence.
7. The circuit protection board according to claim 6, characterized in that: The first charge and discharge protection module further includes a first charge control terminal and a discharge control terminal, the first charge control terminal is connected to the second transistor, and the discharge control terminal is respectively connected to the first voltage regulator diode, the first field effect transistor and the circuit breaker.
8. The circuit protection board according to claim 7, characterized in that: The second charge and discharge protection module further includes a second charge control terminal, and the second charge control terminal is connected to the first transistor.
9. The circuit protection board according to claim 1, wherein: The circuit protection board further includes a thermal detection module, which is connected to the first charge and discharge protection module and the second charge and discharge protection module respectively.
10. A battery device for a projector, characterized in that: It comprises the battery protection board according to any one of claims 1 to 9 and a plurality of batteries, wherein the battery protection board is connected to each of the batteries through a plurality of the battery interfaces.