Battery assembly protection circuit and battery assembly device

Abstract

The utility model provides a battery assembly protection circuit and an energy storage power supply. The battery assembly protection circuit comprises a pre-charging module, a first switch module, a pre-charging indication module and a second switch module. Wherein the first switch module is used for being switched on when the battery is powered on; the pre-charging module is used for pre-charging the pre-charging capacitor when the first switch module is switched on; the pre-charging indication module is used for outputting a pre-charging indication signal when the voltage at the two ends of the pre-charging module is greater than or equal to a first preset threshold value; the second switch module is used for being disconnected when the battery is powered on and is disconnected when the pre-charging indication signal is received; and the second switch module is connected after the pre-charging indication signal disappears, so that the battery supplies power to the load through the second switch module, and the pre-charging module and the first switch module are bypassed. In the initial stage of battery power-on, the pre-charging capacitor is pre-charged through the pre-charging module, the voltage at the two ends of the capacitor can be gradually increased in the pre-charging process, large-current impact is avoided, and the battery and the load are effectively protected.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power electronics, and particularly relates to a battery assembly protection circuit and a battery assembly device. BACKGROUND

[0002] The rapid expansion of the new energy vehicle and energy storage station market leads to an increase in the power of the power equipment, and further leads to an increase in the power of the battery pack. This means that the battery pack needs to provide higher voltage and greater current to meet the needs of the equipment. In order to ensure good power ripple, high-frequency power modules, such as DC-DC (Direct Current-Direct Current converter), LLC (Inductor-Inductor-Capacitor resonant converter) and the like, usually add input filter large electrolytic capacitors. The role of these capacitors is to smooth the ripple in the power supply, improve the stability and reliability of the power supply.

[0003] However, with the increase in the capacitance value and the battery voltage, the battery may have a problem of sparking at the contact point when being assembled and powered on. This is because the large capacitor will generate a large impact current at the moment of charging, and when the resistance of the contact point is large, the sparking phenomenon will be caused, which may cause the contact point to burn black and the through-flow impedance to become large and generate serious heat, or the metal debris of the contact point may splash and cause a short circuit and burning. CONTENT OF THE INVENTION

[0004] The battery assembly protection circuit and the battery assembly device provided by the embodiments of the application make the voltage across the capacitor gradually rise, avoid large current impact, and effectively protect the battery and the load.

[0005] In a first aspect, the embodiments of the application provide a battery assembly protection circuit, comprising: a pre-charging module, a first switch module, a pre-charging indication module and a second switch module; the pre-charging module is connected with the first switch module and a battery respectively, the pre-charging indication module is connected with the pre-charging module in parallel, the control end of the first switch module is connected with the battery, the first switch module is further connected with a pre-charging capacitor and the second switch module respectively, and the second switch module is further connected with the battery, the pre-charging capacitor and a load respectively; the first switch module is used for conducting when the battery is powered on; the pre-charging module is used for pre-charging the pre-charging capacitor when the first switch module is conducting; the pre-charging indication module is used for outputting a pre-charging indication signal when the voltage across the pre-charging module is greater than or equal to a first preset threshold; the second switch module is used for being disconnected when the battery is powered on, and being disconnected when the pre-charging indication signal is received; and the second switch module is used for conducting after the pre-charging indication signal disappears, so as to make the battery supply power to the load through the second switch module, and make the pre-charging module and the first switch module bypassed.

[0006] In some embodiments, the pre-charging module comprises a resistor R1; a first end of the resistor R1 is connected with the battery, and a second end of the resistor R1 is connected with the first switch module; and the resistor R1 is connected in parallel with the pre-charging indication module.

[0007] In some embodiments, the first switch module comprises a resistor R4 and a switch tube Q1; a control end of the switch tube Q1 is connected with the battery through the resistor R4; a first end of the switch tube Q1 is connected with the pre-charging module; and a second end of the switch tube Q1 is connected with the second switch tube and the pre-charging capacitor respectively.

[0008] In some embodiments, the pre-charging indication module comprises a resistor R2 and a light-emitting diode LED2; a positive electrode of the light-emitting diode LED2 is connected with a first end of the pre-charging module; and a negative electrode of the light-emitting diode LED2 is connected with a second end of the pre-charging module through the resistor R2.

[0009] In some embodiments, the second switch module comprises a relay S1; a first end of the relay S1 is connected with the battery; and a second end of the relay S1 is connected with the first switch module, the second switch module, the pre-charging capacitor and the load respectively.

[0010] In some embodiments, the battery assembly protection circuit further comprises a reverse flow prevention module; the reverse flow prevention module is connected with the pre-charging module and the battery respectively; and the reverse flow prevention module is used for preventing reverse current from flowing into the battery.

[0011] In some embodiments, the battery assembly protection circuit further comprises a reverse connection indication module; the reverse connection indication module is connected with the battery; and the reverse connection indication module is used for outputting a reverse connection indication signal when the battery is reversely connected.

[0012] In some embodiments, the reverse connection indication module comprises a diode D2, a light-emitting diode LED3 and a resistor R3; a positive electrode of the diode D2 is connected with the battery; a negative electrode of the diode D2 is connected with a positive electrode of the light-emitting diode LED3 through the resistor R3; and a negative electrode of the light-emitting diode LED3 is connected with the battery.

[0013] In some embodiments, the battery assembly protection circuit further comprises an overvoltage protection module; the overvoltage protection module is connected with a control end of the first switch module; and the overvoltage protection module is used for turning on when a voltage of the battery is greater than or equal to a second preset threshold value, so as to make the first switch module cut off.

[0014] In a second aspect, the embodiments of the present application provide a battery assembly device, which comprises the battery assembly protection circuit as described above.

[0015] Different from the related technical solutions, the embodiments of the present application provide a battery assembly protection circuit and a battery assembly device. The battery assembly protection circuit comprises a pre-charging module, a first switch module, a pre-charging indication module and a second switch module. The pre-charging module is connected with the first switch module and a battery respectively. The pre-charging indication module is connected with the pre-charging module in parallel. The control end of the first switch module is connected with the battery. The first switch module is further connected with a pre-charging capacitor and the second switch module respectively. The second switch module is further connected with the battery, the pre-charging capacitor and a load respectively. The first switch module is used to turn on when the battery is powered on. The pre-charging module is used to pre-charge the pre-charging capacitor when the first switch module is turned on. The pre-charging indication module is used to output a pre-charging indication signal when the voltage between the pre-charging module is greater than or equal to a first preset threshold. The second switch module is used to disconnect when the battery is powered on, and disconnect when the pre-charging indication signal is received. The second switch module is used to turn on after the pre-charging indication signal disappears, so that the battery supplies power to the load through the second switch module, and the pre-charging module and the first switch module are bypassed. In the battery assembly circuit and the battery assembly device provided by the embodiments of the present application, the pre-charging capacitor is pre-charged by the pre-charging module at the initial stage of the battery being powered on. When the battery is directly connected to the load, a large current impulse may be generated due to the initial voltage of the capacitor being zero, which may cause damage to the battery and the load. The pre-charging process can gradually increase the voltage between the capacitor, avoid the large current impulse, and effectively protect the battery and the load. The second switch module is turned on only after the pre-charging indication signal disappears, so that the battery can supply power to the load smoothly. This way of gradually connecting the load can reduce voltage fluctuation and current mutation in the power supply process, and provide a stable power supply for the load. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and not intended to be limiting of the embodiments, and in which like numerals refer to like elements, unless otherwise specified. The drawings are not necessarily to scale, the emphasis instead being placed upon illustrating the principles of the embodiments.

[0017] Figure 1 is a structural block diagram of a battery assembly protection circuit provided by the embodiments of the present application;

[0018] Figure 2 is a structural block diagram of another battery assembly protection circuit provided by the embodiments of the present application;

[0019] Figure 3A circuit structure schematic diagram of a battery assembly protection circuit is provided in the embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0021] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0022] When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can be present therebetween.

[0023] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, not limited to the number of objects, for example, the first object can be one or more.

[0024] Please refer to Figure 1 , Figure 1 A structural block diagram of a battery assembly protection circuit 100 is provided in the embodiment of the present application.

[0025] The embodiment of the present application provides a battery assembly protection circuit 100, which comprises a pre-charging module 10, a first switch module 20, a pre-charging indication module 30 and a second switch module 40.

[0026] The pre-charging module 10 is connected with the first switch module 20 and the battery 200 respectively, the pre-charging indication module 30 is connected with the pre-charging module 10 in parallel, the control end of the first switch module 20 is connected with the battery 200, the first switch module 20 is further connected with the pre-charging capacitor 300 and the second switch module 40 respectively, and the second switch module 40 is further connected with the battery 200, the pre-charging capacitor 300 and the load 400 respectively.

[0027] Specifically, the first switch module 20 is used to turn on when the battery 200 is powered on. The pre-charging module 10 is used to pre-charge the pre-charging capacitor 300 when the first switch module 20 is turned on. The pre-charging indication module 30 is used to output a pre-charging indication signal when the voltage across the pre-charging module 10 is greater than or equal to a first preset threshold. The second switch module 40 is used to turn off when the battery 200 is powered on, and turn off when the pre-charging indication signal is received; and turn on after the pre-charging indication signal disappears, so that the battery 200 supplies power to the load 400 through the second switch module 40, and the pre-charging module 10 and the first switch module 20 are bypassed.

[0028] The first preset threshold is a pre-set voltage value. When the voltage across the pre-charging module 10 is greater than or equal to the first preset threshold, the pre-charging indication module 30 outputs the pre-charging indication signal; when the voltage across the pre-charging module 10 is less than the first preset threshold, the pre-charging indication module 30 does not output the pre-charging indication signal. Specifically, when the pre-charging module 10 charges the pre-charging capacitor 300, the voltage of the pre-charging capacitor 300 gradually increases, and the voltage across the pre-charging module 10 gradually decreases. When the voltage across the pre-charging module 10 decreases to less than the first preset threshold, the pre-charging indication module 30 does not output the pre-charging indication signal. The size of the first preset threshold is related to the components in the circuit and the connection relationship between the components, which is not limited here.

[0029] The pre-charging indication signal is a signal output by the pre-charging indication module 30, which can be an electrical signal or an optical signal, etc. Its generation or not depends on the comparison result of the voltage across the pre-charging module 10 and the first preset threshold, that is, when the voltage across the pre-charging module 10 is greater than or equal to the first preset threshold, the pre-charging indication module 30 outputs the pre-charging indication signal. This signal mainly plays a role in informing and triggering the action of the subsequent circuit. On the one hand, it can be used as an indication to let the external monitoring device or the operator know that the pre-charging process has reached a certain stage, for example, in some large battery assembly scenarios, the worker can judge whether the pre-charging is completed by observing whether the signal is received. On the other hand, it is a key signal for triggering the further action of the second switch module 40 from the internal point of view of the circuit.

[0030] It should be noted that, Figure 1 , Figure 2 , Figure 3 In the above embodiments, the monitoring line (Bn+) and the battery power line (B+) are connected to the same potential.

[0031] In actual application, first, when the battery 200 is powered on, the control end of the first switch module 20 obtains a voltage signal, so that the first switch module 20 is turned on.

[0032] When the first switch module 20 is turned on, the pre-charge module 10, the battery 200 and the pre-charge capacitor 300 form a path. The pre-charge module 10 starts to pre-charge the pre-charge capacitor 300. During the pre-charge process, the current flows from the battery 200 to the pre-charge capacitor 300 through the pre-charge module 10, and the voltage across the pre-charge capacitor 300 gradually rises.

[0033] The voltage across the pre-charge module 10 changes synchronously with the voltage across the pre-charge capacitor 300. At the beginning of the pre-charge, the voltage across the pre-charge module 10 is greater than or equal to the first preset threshold, and the pre-charge indication module 30 connected in parallel with the pre-charge module 10 works. The pre-charge indication module 30 outputs a pre-charge indication signal.

[0034] At the same time when the battery 200 is powered on, the second switch module 40 is in an off state. When the second switch module 40 receives the pre-charge indication signal, it still remains in the off state. At this stage, although the pre-charge capacitor 300 has completed a certain degree of charging, it has not started to supply power to the load 400 through the second switch module 40.

[0035] When the pre-charge indication signal disappears, the second switch module 40 is turned on. At this time, the battery 200 forms a path with the load 400 through the second switch module 40, and starts to supply power to the load 400. At the same time, due to the turn-on of the second switch module 40, the pre-charge module 10 and the first switch module 20 are bypassed. That is, during normal power supply, the current directly flows from the battery 200 to the load 400 through the second switch module 40, without passing through the pre-charge module 10 and the first switch module 20. This bypass design can reduce energy loss and component burden in the circuit, and improve power supply efficiency.

[0036] It should be noted that the turn-on and turn-off of the second switch module 40 can be controlled by a control circuit (such as a single-chip microcomputer or other control circuit), or can be manually controlled, which is not specifically limited here.

[0037] Please refer to Figure 2 , Figure 2 is another structure block diagram of the battery assembly protection circuit 100 provided by the embodiment of the present application.

[0038] In some embodiments, the battery assembly protection circuit 100 further comprises an anti-inversion module 50. The anti-inversion module 50 is connected with the pre-charge module 10 and the battery 200, respectively. Specifically, the anti-inversion module 50 is used to prevent reverse current from flowing into the battery 200.

[0039] In some embodiments, the battery assembly protection circuit 100 further comprises a reverse connection indication module 60. The reverse connection indication module 60 is connected with the battery 200. Specifically, the reverse connection indication module 60 is used to output a reverse connection indication signal when the battery 200 is reversely connected.

[0040] Wherein, the reverse connection indication signal is an electrical signal sent by the reverse connection indication module 60. It is a signal for prompting the reverse connection of the positive and negative poles of the battery 200. The normal connection of the battery 200 means that the positive pole of the battery 200 is connected with the B+ point in the figure ( Figure 1 、 Figure 2 、 Figure 3 ), and the negative pole of the battery 200 is connected with the B- point in the figure ( Figure 1 、 Figure 2 、 Figure 3 ). The reverse connection of the battery 200 means that the positive pole of the battery 200 is connected with the B- point in the figure ( Figure 1 、 Figure 2 、 Figure 3 ), and the negative pole of the battery 200 is connected with the B+ point in the figure ( Figure 1 、 Figure 2 、 Figure 3 ).

[0041] In some embodiments, the battery assembly protection circuit 100 further comprises an overvoltage protection module 70. Wherein, the overvoltage protection module 70 is connected with the control end of the first switch module 20. Specifically, the overvoltage protection module 70 is used to turn on when the voltage of the battery 200 is greater than or equal to the second preset threshold value, so that the first switch module 20 is cut off.

[0042] Wherein, the second preset threshold value is a pre-set voltage value for judging whether the voltage of the battery 200 is too high. The overvoltage protection mechanism is triggered based on this threshold value. When the voltage of the battery 200 rises to be greater than or equal to the second preset threshold value, the overvoltage protection module 70 will take action. This is to reduce the possibility of damage to the components in the circuit (such as the first switch module 20, the pre-charging capacitor 300, the second switch module 40 and the load 400, etc.) caused by the high voltage of the battery. The size of the second preset threshold value is related to the components in the circuit, as well as the connection relationship between the components, which is not limited here.

[0043] Please refer to Figure 3 , Figure 3 is a circuit structure schematic diagram of a battery assembly protection circuit 100 provided by the embodiment of the application.

[0044] In some embodiments, the pre-charging module 10 comprises a resistor R1. Wherein, the first end of the resistor R1 is connected with the battery 200, the second end of the resistor R1 is connected with the first switch module 20, and the resistor R1 is connected with the pre-charging indication module 30 in parallel.

[0045] Wherein, the resistor R1 is a pre-charging resistor.

[0046] In some embodiments, the first switch module 20 comprises a resistor R4 and a switch tube Q1. The control terminal of the switch tube Q1 is connected to the battery 200 through the resistor R4, the first terminal of the switch tube Q1 is connected to the pre-charge module 10, and the second terminal of the switch tube Q1 is connected to the second switch tube and the pre-charge capacitor 300 respectively.

[0047] The resistor R4 is the base limiting current resistor of the switch tube Q1.

[0048] The switch tube Q1 can be an NPN triode or any other suitable switching device, which is not limited herein. If the switch tube Q1 is an NPN triode, the control terminal of the switch tube Q1 is the base of the NPN triode, the second terminal of the switch tube Q1 is the emitter of the NPN triode, and the first terminal of the switch tube Q1 is the collector of the NPN triode.

[0049] In some embodiments, the pre-charge indication module 30 comprises a resistor R2 and a light-emitting diode LED2. The anode of the light-emitting diode LED2 is connected to the first terminal of the pre-charge module 10, and the cathode of the light-emitting diode LED2 is connected to the second terminal of the pre-charge module 10 through the resistor R2. The light emitted by the light-emitting diode LED2 is the pre-charge indication signal. The first preset threshold is related to the element parameters of the resistor R2 and the light-emitting diode LED2.

[0050] The resistor R2 is the current limiting resistor of the light-emitting diode LED2.

[0051] In some embodiments, the second switch module 40 comprises a relay S1. The first terminal of the relay S1 is connected to the battery 200, and the second terminal of the relay S1 is connected to the first switch module 20, the second switch module 40, the pre-charge capacitor 300, and the load 400 respectively.

[0052] In some embodiments, the reverse connection indication module 60 comprises a diode D2, a light-emitting diode LED3, and a resistor R3. The anode of the diode D2 is connected to the battery 200, the cathode of the diode D2 is connected to the anode of the light-emitting diode LED3 through the resistor R3, and the cathode of the light-emitting diode LED3 is connected to the battery 200. The light emitted by the light-emitting diode LED3 is the reverse connection indication signal.

[0053] The resistor R3 is the current limiting resistor of the light-emitting diode LED3.

[0054] The light-emitting diode LED2 and the light-emitting diode LED3 have different light-emitting colors. For example, the light-emitting diode LED2 can be a yellow light-emitting diode, the light-emitting diode LED3 can be a red light-emitting diode, and the light-emitting diodes LED2 and LED3 can also be light-emitting diodes emitting other colors, which are not limited herein.

[0055] In some embodiments, the reverse flow prevention module 50 comprises a diode Dl. Wherein, the positive pole of the diode Dl is connected with the battery, and the negative pole of the diode Dl is connected with the pre-charge module 10, the first switch module 20 and the pre-charge indication module 30 respectively.

[0056] In some embodiments, the overvoltage protection module 70 comprises a zener diode DZl. Wherein, the positive pole of the zener diode DZl is connected with the battery, and the negative pole of the zener diode DZl is connected with the control end of the first switch module 20 (i.e. the control end of the switch tube Ql). Wherein, the second preset threshold value is related to the element parameter of the zener diode DZl.

[0057] The following will be described in detail Figure 3 The working principle of the battery protection circuit 100 will be briefly described.

[0058] When the battery BAT (the battery 200) is powered on, the relay S1 is disconnected. At this time, the pre-charge action is performed, and during the pre-charge process, the voltage of the battery BAT is equal to the voltage of the pre-charge capacitor C1 + the voltage drop of the resistor R1 + the voltage drop of the diode Dl. Wherein, the voltage drop of the diode Dl can be ignored with respect to the voltage of the battery BAT.

[0059] At the beginning of charging, the voltage of the pre-charge capacitor C1 is low, and most of the voltage will be applied across the resistor Rl. At the same time, because the light-emitting diode LED2 and the resistor R2 connected in series are connected in parallel across the resistor Rl, the light-emitting diode LED2 is lit (pre-charge indication signal), which represents that the voltage of the pre-charge capacitor C1 is too low and is still in the process of large current charging.

[0060] After pre-charging for a period of time, the voltage of the pre-charge capacitor C1 becomes high, and the voltage across the resistor Rl becomes low until the voltage across the resistor Rl cannot light up the light-emitting diode LED2, which represents that the pre-charge capacitor C1 is fully charged.

[0061] After the pre-charge is completed, the relay S1 contact point (i.e. Figure 3 the 1 point and the 2 point of the relay S1) can be safely locked. At this time, the pre-charge circuit is directly shielded by short circuit, and the positive pole (B+ point) of the battery BAT directly supplies power to the pre-charge capacitor C1 and the load 400.

[0062] And if the battery BAT is reversed, once the monitoring line (Bn+) is connected, the light-emitting diode LED3 will light up to alarm.

[0063] If the battery BAT is connected incorrectly, causing the voltage of the Bn+ point to exceed the breakdown voltage of the zener diode DZl, the zener diode DZl will be reversely conducted, causing the switch tube Ql to be cut off. Thus, the possibility of the pre-charge capacitor C1 being burned by overvoltage is reduced.

[0064] The battery assembling circuit and the battery assembling device provided by the embodiments of the present application can pre-charge the pre-charge capacitor through the pre-charge module at the initial stage of the power-on of the battery. When the battery is directly connected to the load, a large current impact may occur due to the initial voltage of the capacitor being zero, which may cause damage to the battery and the load. The pre-charge process can gradually increase the voltage across the capacitor, avoiding the large current impact and effectively protecting the battery and the load. The second switch module is turned on only after the pre-charge indication signal disappears, so that the battery can stably supply power to the load. This way of gradually connecting the load can reduce voltage fluctuation and current mutation in the power supply process, and provide a stable power supply for the load.

[0065] The embodiments of the present application further provide a battery assembling device comprising the battery assembling protection circuit 100 as described above.

[0066] The structure and working principle of the battery assembling protection circuit 100 can refer to the above embodiments, and will not be described here.

[0067] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes of the different aspects of the present application as described above, in order to be simple, they are not provided in details; although the present application 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 for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly protection circuit, characterized by, The battery assembly protection circuit comprises a pre-charging module, a first switch module, a pre-charging indication module and a second switch module. The pre-charging module is connected with the first switch module and a battery respectively, the pre-charging indication module is connected with the pre-charging module in parallel, the control end of the first switch module is connected with the battery, the first switch module is further connected with a pre-charging capacitor and the second switch module respectively, and the second switch module is further connected with the battery, the pre-charging capacitor and a load respectively. The first switch module is used for being turned on when the battery is powered on. The pre-charging module is used for pre-charging the pre-charging capacitor when the first switch module is turned on. The pre-charging indication module is used for outputting a pre-charging indication signal when the voltage between the two ends of the pre-charging module is greater than or equal to a first preset threshold. The second switch module is used for being turned off when the battery is powered on, and being turned off when the pre-charging indication signal is received, and being turned on after the pre-charging indication signal disappears, so that the battery supplies power to the load through the second switch module, and the pre-charging module and the first switch module are bypassed. The pre-charging module comprises a resistor R1.

2. The battery assembly protection circuit of claim 1, wherein, The first end of the resistor R1 is connected with the battery, and the second end of the resistor R1 is connected with the first switch module, and the resistor R1 is connected with the pre-charging indication module in parallel. The first switch module comprises a resistor R4 and a switch tube Q1.

3. The battery assembly protection circuit of claim 1, wherein, The control end of the switch tube Q1 is connected with the battery through the resistor R4, the first end of the switch tube Q1 is connected with the pre-charging module, and the second end of the switch tube Q1 is connected with the second switch module and the pre-charging capacitor respectively. The pre-charging indication module comprises a resistor R2 and a light-emitting diode LED2.

4. The battery assembly protection circuit of claim 1, wherein, The anode of the light-emitting diode LED2 is connected with the first end of the pre-charging module, and the cathode of the light-emitting diode LED2 is connected with the second end of the pre-charging module through the resistor R2. The second switch module comprises a relay S1.

5. The battery assembly protection circuit of claim 1, wherein, The first end of the relay S1 is connected with the battery, and the second end of the relay S1 is connected with the first switch module, the second switch module, the pre-charging capacitor and the load respectively. The battery assembly protection circuit further comprises an anti-backflow module.

6. The battery assembly protection circuit of claim 1, wherein, The anti-backflow module is connected with the pre-charging module and the battery respectively. The anti-backflow module is used for preventing reverse current from flowing into the battery. The battery assembly protection circuit further comprises a reverse connection indication module.

7. The battery assembly protection circuit of claim 1, wherein, The reverse connection indication module is connected with the battery. The reverse connection indication module is used for outputting a reverse connection indication signal when the battery is reversely connected. The reverse connection indication module comprises a diode D2, a light-emitting diode LED3 and a resistor R3.

8. The battery assembly protection circuit of claim 7, wherein, The anode of the diode D2 is connected with the battery, the cathode of the diode D2 is connected with the anode of the light-emitting diode LED3 through the resistor R3, and the cathode of the light-emitting diode LED3 is connected with the battery. The battery assembly protection circuit further comprises an overvoltage protection module.

9. The battery assembly protection circuit according to any one of claims 1 to 8, characterized in that, The overvoltage protection module is connected with the control end of the first switch module. ​ The overvoltage protection module is configured to be turned on when the voltage of the battery is greater than or equal to a second preset threshold, so as to turn off the first switch module.

10. A battery assembly apparatus, characterized by, The battery assembly protection circuit comprises the battery assembly protection circuit according to any one of claims 1 to 9.

Images