Portable energy storage systems and appliances

Abstract

The present invention discloses a portable energy storage system and an electrical appliance, wherein the portable energy storage system comprises: a battery module for providing electrical energy, an output module for connecting a load, and a battery protection module connected between the battery module and the output module, wherein the battery protection module is used to detect whether the portable energy storage system is overloaded and short-circuited, and to self-restore the portable energy storage system when the portable energy storage system is overloaded and short-circuited. Compared with the prior art, the present invention can realize short-circuit protection of the portable energy storage system and self-recovery after the output end is overloaded.

Description

Technical Field

[0001] The invention relates to a portable power source, in particular to a portable energy storage system and an electrical appliance. Background Art

[0002] During the use of portable power products, improper use may cause a short circuit at the output end. The battery management IC controls the charging and discharging MOS tubes to disconnect for short-circuit protection. Short-circuit protection recovery requires the introduction of a specific switch and manual reset, which is not only costly but also cumbersome to operate.

[0003] Therefore, how to design a portable energy storage system and an electrical appliance so that the self-recovery circuit can operate when the output end of the portable power source is overloaded and short-circuited is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0004] In view of the problem in the prior art that when the output end of a portable power supply is short-circuited, short-circuit protection recovery requires the introduction of a specific switch and requires manual reset, resulting in high cost and cumbersome operation, the present invention proposes a portable energy storage system and an electrical appliance.

[0005] The technical solution of the present invention is to propose a portable energy storage system, including: a battery module for providing electrical energy, an output module for connecting a load, and a battery protection module connected between the battery module and the output module, wherein the battery protection module is used to detect whether the portable energy storage system is overloaded and short-circuited, and to self-restore the portable energy storage system when the portable energy storage system is overloaded and short-circuited.

[0006] Furthermore, the battery protection module includes:

[0007] A voltage dividing unit connected between the battery module and the output module, used for voltage dividing to change the voltage outputted from the battery module to the output module;

[0008] The first control unit is used to detect the output parameters of the battery module and the input parameters of the output module, and determine whether the portable energy storage system is overloaded and short-circuited according to the output parameters and the input parameters, and turn on the voltage dividing unit when the portable energy storage system is overloaded and short-circuited.

[0009] Further, the output module includes an interface module connected to a DC load, and an inverter module connected to an AC load;

[0010] The voltage dividing unit includes a first voltage dividing circuit connected between the battery module and the interface module, and a second voltage dividing circuit connected between the battery module and the inverter module.

[0011] Furthermore, the first voltage-dividing circuit includes: a voltage-dividing resistor R1 and a voltage-dividing resistor R2 connected in series between the battery module and the interface module, and a normally closed relay K1 connected in parallel across the voltage-dividing resistor R1 and the voltage-dividing resistor R2.

[0012] Furthermore, the second voltage divider circuit includes: a voltage divider resistor R3 and a voltage divider resistor R4 connected in series between the battery module and the inverter module, and a normally closed relay K2 connected in parallel between the voltage divider resistor R3 and the voltage divider resistor R4.

[0013] Furthermore, the first control unit is also connected to both ends of the voltage-dividing resistor R1. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K1 to disconnect, detects the voltage across the voltage-dividing resistor R1, and controls the normally closed relay K1 to close when the voltage across the voltage-dividing resistor R1 is lower than a first preset voltage.

[0014] Furthermore, the first control unit is also connected to both ends of the voltage-dividing resistor R3. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K2 to disconnect, detects the voltage across the voltage-dividing resistor R3, and controls the normally closed relay K2 to close when the voltage across the voltage-dividing resistor R3 is lower than a second preset voltage.

[0015] Furthermore, the battery protection module also includes a second control unit connected to the output end of the battery module, and the second control unit is used to detect the single cell voltage of each battery in the battery module and the total current output by the battery module, and adjust the working state of the battery module to avoid battery damage when the battery module fails.

[0016] Furthermore, the second control unit includes: at least one switch tube connected in series to the output end of the battery module, and a battery management IC for detecting the single cell voltage and the total current. The battery management IC can also adjust the charge and discharge state of the switch tube when the battery module fails to adjust the working state of the battery module.

[0017] Furthermore, the resistance values ​​of the voltage-dividing resistors R1 , R2 , R3 , and R4 are selected according to the short-circuit protection threshold set for the portable energy storage system and the impedance of the output end.

[0018] Furthermore, the output parameter is the output voltage of the battery module, and the input parameter is the input voltage of the output module.

[0019] The present invention also provides an electrical appliance, which adopts the portable energy storage system.

[0020] Furthermore, the electrical appliance is an air conditioner.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] The battery protection module can detect whether the portable energy storage system is overloaded or short-circuited. In the event of an overload or short-circuit, the load can be unloaded and the circuit can be self-recovered, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the composition of the portable energy storage system of the present invention;

[0025] Figure 2 It is a circuit connection schematic diagram of the portable energy storage system of the present invention;

[0026] Figure 3 is a connection diagram of a first voltage divider circuit of the present invention;

[0027] Figure 4 It is a connection schematic diagram of the first voltage divider circuit when the output end of the portable energy storage system of the present invention is short-circuited;

[0028] Figure 5 It is a connection diagram of the first voltage divider circuit when the output end of the portable energy storage system of the present invention works normally. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0031] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0032] During the use of portable power products, improper use can easily cause short circuits at the output end. The battery management IC controls the charge and discharge MOS tubes to disconnect for short circuit protection. Then, short circuit protection recovery requires the introduction of a specific switch and manual reset, which is costly and cumbersome. The idea of ​​the present invention is to propose a portable energy storage system that can detect overload short circuits in the portable energy storage system and self-recovery of the circuit in the event of overload short circuits through the cooperation of a relay and a first control unit.

[0033] The portable energy storage system proposed by the present invention comprises:

[0034] Battery modules for providing power to portable energy storage systems;

[0035] Output module, used to connect load;

[0036] The battery protection module is used to detect whether the portable energy storage system is overloaded or short-circuited, and to achieve self-recovery in the event of an overload or short-circuit.

[0037] The battery protection module may at least include:

[0038] A voltage dividing unit, connected between the battery module and the output module, for dividing the voltage to change the voltage outputted from the battery module to the output module;

[0039] The first control unit is used to detect the output parameters of the battery module and the input parameters of the output module, determine whether the portable energy storage system is overloaded and short-circuited according to the output parameters and the input parameters, and turn on the voltage dividing unit when the portable energy storage system is overloaded and short-circuited.

[0040] See also Figure 1 The output module includes an interface module connected to a DC load and an inverter module connected to an AC load. To match the settings of the interface module and the inverter module, the voltage divider unit includes a first voltage divider circuit connected between the battery module and the interface module, and a second voltage divider circuit connected between the battery module and the inverter module. The conduction state of the first voltage divider circuit and the second voltage divider circuit is controlled by a first control unit. The first control unit can make the first voltage divider circuit and the second voltage divider circuit conduct when the portable energy storage system is overloaded and short-circuited.

[0041] See also Figure 3The first voltage-dividing circuit includes: a voltage-dividing resistor R1, a voltage-dividing resistor R2 and a normally closed relay K1; wherein, the voltage-dividing resistor R1 and the voltage-dividing resistor R2 are connected in series and connected between the battery module and the interface module, and the normally closed relay K1 is connected in parallel at both ends of the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The normally closed relay K1 can be disconnected under the control of the first control unit. When the normally closed relay K1 is in a closed state, it is equivalent to short-circuiting the voltage-dividing resistor R1 and the voltage-dividing resistor R2. At this time, the voltage-dividing resistor R1 and the voltage-dividing resistor R2 are not connected to the circuit. When the normally closed relay K1 is disconnected under the control of the first control unit, the current output by the battery module can only flow out through the voltage-dividing resistor R1 and the voltage-dividing resistor R2. At this time, the voltage-dividing resistor R1 and the voltage-dividing resistor R2 are connected to the circuit to play a voltage-dividing role.

[0042] Furthermore, in order to realize the self-recovery function of the portable energy storage system, the first control unit is also connected to both ends of the voltage-dividing resistor R1. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K1 to disconnect, and then detects the voltage across the voltage-dividing resistor R1, and compares the voltage across the voltage-dividing resistor R1 with the first preset voltage. When the voltage across the voltage-dividing resistor is lower than the first preset voltage, the normally closed relay K1 is controlled to close, so that the circuit self-recovers.

[0043] See also Figure 2 , the second voltage-dividing circuit includes: a voltage-dividing resistor R3, a voltage-dividing resistor R4 and a normally closed relay K2; wherein, the voltage-dividing resistor R3 and the voltage-dividing resistor R4 are connected in series and connected between the battery module and the inverter module, the normally closed relay K2 is connected in parallel at both ends of the voltage-dividing resistor R3 and the voltage-dividing resistor R4, and the normally closed relay K2 can be disconnected under the control of the first control unit. Its working principle is the same as that of the first voltage-dividing circuit. When the normally closed relay K2 is in a closed state, it is equivalent to short-circuiting the voltage-dividing resistor R3 and the voltage-dividing resistor R4. At this time, the voltage-dividing resistor R3 and the voltage-dividing resistor R4 are not connected to the circuit. When the normally closed relay K2 is disconnected under the control of the first control unit, the current output by the battery module can only flow out through the voltage-dividing resistor R3 and the voltage-dividing resistor R4. At this time, the voltage-dividing resistor R3 and the voltage-dividing resistor R4 are connected to the circuit to play a voltage-dividing role.

[0044] The same as the setting of the first voltage-dividing circuit, in order to realize the self-recovery function of the portable energy storage system, the first control unit is also connected to both ends of the voltage-dividing resistor R3. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K2 to disconnect, and then detects the voltage across the voltage-dividing resistor R3, and compares the voltage across the voltage-dividing resistor R3 with the second preset voltage. When the voltage across the voltage-dividing resistor is lower than the second preset voltage, the normally closed relay K2 is controlled to close, so that the circuit self-recovers.

[0045] It should be pointed out that the first voltage-dividing circuit is used to realize self-recovery at the interface module, that is, self-recovery when the output end of the portable energy storage system is short-circuited due to overload of the DC load, and the second voltage-dividing circuit is used to realize self-recovery at the inverter module, that is, self-recovery when the output end of the portable energy storage system is short-circuited due to overload of the AC load. The output parameter collected by the first control unit is the output voltage of the battery module, and the input parameter is the input voltage of the output module. Here, the input voltage of the output module includes the input voltage of the interface module and the input voltage of the inverter module. When the input voltage is much smaller than the output voltage, or the input voltage is zero, it means that the output end of the portable energy storage system is overloaded and short-circuited.

[0046] When the input voltage of the interface module is abnormal, it means that the DC load is overloaded. The DC load can be unloaded through the battery management IC. At this time, the first control unit disconnects the normally closed relay K1 to connect the voltage-dividing resistors R1 and R2 to the circuit, further dividing the voltage to avoid DC load overload. The first control unit simultaneously detects the voltage across the voltage-dividing resistor R1. When the voltage across the voltage-dividing resistor R1 is lower than the first preset voltage, the circuit returns to normal. The first control unit controls the normally closed relay K1 to close, shielding the voltage-dividing resistors R1 and R2 to achieve the self-recovery function. When the input voltage of the inverter module is abnormal, it means that the AC load is overloaded. The control method in this case is the same as the control method under DC load overload, which will not be repeated here.

[0047] Furthermore, the battery protection module also includes a second control unit connected to the output end of the battery module, and the second control unit is used to detect the single cell voltage of each battery in the battery module and the total current output by the battery module, and adjust the working state of the battery module to prevent battery damage caused by overcurrent, overcharging, and undervoltage, thereby extending the battery life.

[0048] See also Figure 2 The second control unit includes: at least one switch tube connected in series to the output end of the battery module, and a battery management IC for detecting the single cell voltage and the total current. The battery management IC can adjust the charge and discharge state of the switch tube connected to the output end of the battery module to adjust the working state of the battery module and avoid battery damage. Here, the battery management IC can also control the switch tube to disconnect to remove the load when an overload short circuit occurs in the portable energy storage system, thereby performing short circuit protection. The device can cooperate with the first control unit to realize the self-recovery function. Among them, the switch tube in the second control unit is a MOS tube.

[0049] Combine the following Figure 4 , Figure 5 The working principle of the present invention is described:

[0050] When the load is connected, when the circuit works normally, the normally closed relay K1 is in a closed state, at this time the voltage divider resistor R1 and the voltage divider resistor R2 are short-circuited, and the equivalent circuit of the first voltage divider circuit is as follows: Figure 5 , the first control unit now detects the voltage between the output terminals B+ and B- of the battery module, and the voltage between the input terminals P+ and P- of the interface module. At this time, the voltages of the two are approximately equal, the normally closed relay K1 is closed, and the circuit works normally;

[0051] When the load is connected and the circuit is overloaded and short-circuited, the first control unit detects that the voltage at the input terminals P+ and P- of the interface module drops to 0 (or is much smaller than the voltage between the output terminals B+ and B- of the battery module). The first control unit determines that the portable energy storage system is overloaded and short-circuited, and controls the normally closed relay K1 to disconnect. The equivalent circuit of the first voltage divider circuit is as follows: Figure 4 The output current of the battery module flows through the voltage-dividing resistor R1 and the voltage-dividing resistor R2. At this time, the voltage-dividing resistor R1 performs voltage division. The first control unit collects the voltage across the voltage-dividing resistor R1. At the same time, the second control unit adjusts the charge and discharge state of the switch tube to remove the overload.

[0052] After the load is removed, when the circuit is restored, the voltage across the voltage divider resistor R1 is lower than the first preset voltage. At this time, the first control unit controls the normally closed relay K1 to close, shielding the voltage divider resistors R1 and R2, and the circuit resumes normal operation.

[0053] It should be pointed out that when the portable energy storage system is overloaded and short-circuited, its output end is equivalent to a short circuit, and the resistance is 0. Therefore, the circuit only divides the voltage through the voltage-dividing resistor R1 and the voltage-dividing resistor R2. When the portable energy storage system returns to normal, the output end is connected to the circuit, and its own output end impedance is connected to the circuit. The circuit divides the voltage through the voltage-dividing resistor R1, the voltage-dividing resistor R2 and the output end impedance, so that the voltage-dividing resistor R1 is reduced. Here, the first threshold voltage is determined according to the load selection, and the resistance values ​​of the voltage-dividing resistors R1 and R2 are determined according to the first preset voltage and the output end impedance. The working principle of the second voltage-dividing circuit is the same as that of the second voltage-dividing circuit, and will not be repeated here. The resistance values ​​of the voltage-dividing resistors R3 and R4 are determined according to the second preset voltage and the output end impedance. Here, the first preset voltage and the second preset voltage are collectively referred to as the short-circuit protection threshold.

[0054] The present invention also provides an electrical appliance, which adopts the portable energy storage system.

[0055] Furthermore, the electrical appliance is an air conditioner.

[0056] Compared with the prior art, the present invention can detect whether the portable energy storage system is overloaded or short-circuited through the battery protection module. When the portable energy storage system is overloaded or short-circuited, the load can be unloaded and the circuit can be self-recovered, thereby improving the user experience.

[0057] The above embodiments are only used to illustrate the specific implementation methods of the present invention. It should be pointed out that, for ordinary technicians in this field, several deformations and changes can be made without departing from the concept of the present invention. These deformations and changes should all fall within the protection scope of the present invention.

Claims

1. Portable energy storage system, including: A battery module for providing electric energy and an output module for connecting a load, characterized in that it also includes a battery protection module connected between the battery module and the output module, the battery protection module is used to detect whether the portable energy storage system is overloaded and short-circuited, and self-restore the portable energy storage system when the portable energy storage system is overloaded and short-circuited; The battery protection module comprises: A voltage dividing unit connected between the battery module and the output module, used for voltage dividing to change the voltage outputted from the battery module to the output module; A first control unit, which is used to detect the output parameters of the battery module and the input parameters of the output module, and determine whether the portable energy storage system is overloaded and short-circuited according to the output parameters and the input parameters, and turn on the voltage dividing unit when the portable energy storage system is overloaded and short-circuited; The output module includes an interface module connected to a DC load, and an inverter module connected to an AC load; The voltage dividing unit includes a first voltage dividing circuit connected between the battery module and the interface module, and a second voltage dividing circuit connected between the battery module and the inverter module; The first voltage-dividing circuit comprises: a voltage-dividing resistor R1 and a voltage-dividing resistor R2 connected in series between the battery module and the interface module, and a normally closed relay K1 connected in parallel between the voltage-dividing resistor R1 and the voltage-dividing resistor R2; The first control unit is also connected to both ends of the voltage-dividing resistor R1. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K1 to disconnect, detects the voltage across the voltage-dividing resistor R1, and controls the normally closed relay K1 to close when the voltage across the voltage-dividing resistor R1 is lower than a first preset voltage.

2. The portable energy storage system according to claim 1, characterized in that: The second voltage-dividing circuit includes: a voltage-dividing resistor R3 and a voltage-dividing resistor R4 connected in series between the battery module and the inverter module, and a normally closed relay K2 connected in parallel between the voltage-dividing resistor R3 and the voltage-dividing resistor R4.

3. The portable energy storage system according to claim 2, characterized in that: The first control unit is also connected to both ends of the voltage-dividing resistor R3. When the portable energy storage system is overloaded and short-circuited, the first control unit controls the normally closed relay K2 to disconnect, detects the voltage across the voltage-dividing resistor R3, and controls the normally closed relay K2 to close when the voltage across the voltage-dividing resistor R3 is lower than a second preset voltage.

4. The portable energy storage system according to claim 1, characterized in that: The battery protection module also includes a second control unit connected to the output end of the battery module, the second control unit is used to detect the single cell voltage of each battery in the battery module and the total current output by the battery module, and adjust the working state of the battery module to avoid battery damage when the battery module fails.

5. The portable energy storage system according to claim 4, characterized in that: The second control unit includes: at least one switch tube connected in series to the output end of the battery module, and a battery management IC for detecting the single cell voltage and the total current. The battery management IC can also adjust the charge and discharge state of the switch tube when the battery module fails to adjust the working state of the battery module.

6. The portable energy storage system according to claim 1 or 2, characterized in that: The resistance values ​​of the voltage-dividing resistors R1 , R2 , R3 , and R4 are selected according to the short-circuit protection threshold set for the portable energy storage system and the impedance of the output end.

7. The portable energy storage system according to claim 1, characterized in that: The output parameter is the output voltage of the battery module, and the input parameter is the input voltage of the output module.

8. An electrical appliance, characterized in that The electrical appliance adopts the portable energy storage system as described in any one of claims 1 to 7.

9. The electrical appliance according to claim 8, characterized in that The electrical appliance is an air conditioner.

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