Lithium battery control device and lithium battery

Abstract

The lithium battery control device comprises a control module, a power supply conversion module, a load detection module and a protection module, an input end of the load detection module is electrically connected with a battery pack negative electrode output end of the lithium battery, a first output end of the load detection module is electrically connected with a negative electrode of a battery cell in the lithium battery, and a second output end of the load detection module is electrically connected with a negative electrode of the battery cell in the lithium battery. The second output end of the load detection module is electrically connected with the enable signal input end of the power conversion module and the detection signal input end of the control module. The enable signal input end of the power conversion module is also electrically connected with the enable signal output end of the control module; the first input end of the protection module is electrically connected with the output end of the overcurrent protection circuit, the second input end of the protection module is electrically connected with the cathode of the battery cell, and the output end of the protection module is electrically connected with the cathode output end of the battery pack. According to the utility model, after load access is automatically detected, starting of the lithium battery is automatically realized, manual intervention is not needed, and the use convenience of the lithium battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium batteries, and particularly relates to a control device for a lithium battery and a lithium battery. Background Art

[0002] A lithium battery is a new type of high-efficiency and energy-saving energy storage device, which has characteristics such as high energy density, high efficiency, and high discharge stability. Compared with traditional batteries, lithium batteries have a longer service life, a faster charging speed, and a higher energy conversion efficiency, and can better meet the energy needs of modern people. Therefore, lithium batteries have been widely used. However, there are also some problems in the use of lithium batteries, which seriously reduce the convenience of using lithium batteries.

[0003] In order to ensure the safety of a lithium battery during use, an overcurrent protection circuit, an overvoltage protection circuit, a discharge detection circuit, etc. are provided in the lithium battery device. When the current flowing through the load exceeds the preset current range of the lithium battery, the overcurrent protection circuit controls the lithium battery to stop discharging, and the lithium battery is in a shutdown state. If the lithium battery is to be turned on, it is necessary to manually turn on the switch of the lithium battery or send a control instruction through a control terminal (such as a web page or an APP, etc.) to turn on the lithium battery, which seriously affects the convenience of using the lithium battery.

[0004] There are many chargers for charging lithium batteries. Among them, an intelligent charger can adjust the charging current and voltage according to the specific characteristics of the lithium battery to ensure that the battery can be charged safely and effectively. The intelligent charger has been widely used. However, when using an intelligent charger to charge a lithium battery, the intelligent charger needs to detect the voltages of the positive and negative electrodes of the battery pack in the lithium battery. If there are voltages at the positive and negative electrodes of the battery pack, the intelligent charger activates the charging of the lithium battery. If there are no voltages at the positive and negative electrodes of the battery pack, to ensure the safety of the lithium battery, the intelligent charger cannot charge the lithium battery at this time, which seriously affects the convenience of using the lithium battery.

[0005] In summary, there are many problems with the existing lithium battery control devices that make them inconvenient to use. Summary of the Utility Model

[0006] In view of this, the utility model provides a control device for a lithium battery and a lithium battery, and the main purpose is to solve the problem that there are many problems with the existing lithium battery control devices that make them inconvenient to use.

[0007] To solve the above problems, the present application provides a control device for a lithium battery, including a control module, a power conversion module, a load detection module, and a protection module. Among them, the input end of the load detection module is electrically connected to the negative output end of the battery pack of the lithium battery, the first output end of the load detection module is electrically connected to the negative electrode of the battery cell in the lithium battery, and the second output end of the load detection module is respectively electrically connected to the enable signal input end of the power conversion module and the detection signal input end of the control module; the enable signal input end of the power conversion module is also electrically connected to the enable signal output end of the control module, the positive input end of the power conversion module is electrically connected to the positive output end of the battery pack of the lithium battery, and the power output end of the power conversion module is electrically connected to the power input end of the control module; the first input end of the protection module is electrically connected to the input end of the overcurrent protection circuit, the second input end of the protection module is electrically connected to the negative electrode of the battery cell, and the output end of the protection module is electrically connected to the negative output end of the battery pack; the start signal output end of the control module is electrically connected to the input end of the overcurrent protection circuit;

[0008] Among them, when the protection module disconnects the connection between the negative electrode of the battery cell and the negative output end of the battery pack, the lithium battery is in the shutdown state. When a load is connected between the negative output end and the positive output end of the battery pack, the input end and the first output end of the load detection module are conducted, and the second output end of the load detection module outputs a load detection signal to make the lithium battery in the startup state; when no load is connected between the negative output end and the positive output end of the battery pack, there is a current less than the preset current value between the input end and the first output end of the load detection module.

[0009] In an embodiment of the present invention, optionally, the load detection module includes a first switch, a first resistor, a second resistor, a third resistor, a first diode, a second diode, a third diode, and a fourth diode. Among them,

[0010] The anode of the first diode is electrically connected to the negative output terminal of the battery pack. The cathode of the first diode is electrically connected to the anode of the second diode. The cathode of the second diode is electrically connected to the first end of the first resistor. The second end of the first resistor is respectively electrically connected to the first end of the second resistor and the control input terminal of the first switch. The first output terminal of the first switch is electrically connected to the negative electrode of the battery cell. The second output terminal of the first switch is respectively electrically connected to the cathodes of the third diode and the fourth diode. The anode of the third diode is electrically connected to the enable signal input terminal of the power conversion module. The anode of the fourth diode is electrically connected to the first end of the third resistor. The second end of the third resistor is electrically connected to the detection signal input terminal of the control module. The second end of the second resistor is electrically connected to the negative electrode of the battery cell.

[0011] In an embodiment of the present invention, optionally, the first switch is a triode. Among them, the base of the triode is respectively electrically connected to the second end of the first resistor and the first end of the second resistor. The emitter of the triode is electrically connected to the negative electrode of the battery cell. The collector of the triode is electrically connected to the cathodes of the third diode and the fourth diode.

[0012] In an embodiment of the present invention, optionally, a fourth resistor is provided between the power output terminal of the power conversion module and the power input terminal of the control module.

[0013] In an embodiment of the present invention, optionally, the load detection module further includes a fifth resistor. The first end of the fifth resistor is respectively electrically connected to the second end of the third resistor and the detection signal input terminal of the control module. The second end of the fifth resistor is electrically connected to the positive output terminal of the power conversion module.

[0014] In an embodiment of the present invention, optionally, the protection module includes a sixth resistor, a second switch, and a third switch. The control input terminal of the second switch is electrically connected to the output terminal of the overcurrent protection circuit. The first output terminal of the second switch is electrically connected to the first end of the sixth resistor. The second output terminal of the second switch is electrically connected to the first output terminal of the third switch. The control input terminal of the third switch is electrically connected to the output terminal of the overvoltage protection circuit. The second output terminal of the third switch is electrically connected to the negative output terminal of the battery pack. The second end of the sixth resistor is electrically connected to the negative electrode of the battery cell.

[0015] In an embodiment of the present utility model, optionally, the second switch is a first MOS transistor, and the third switch is a second MOS transistor. Wherein, the gate of the first MOS transistor is electrically connected to the output end of the overcurrent protection circuit, the source of the first MOS transistor is electrically connected to the first end of the sixth resistor, the drain of the first MOS transistor is electrically connected to the drain of the second MOS transistor, the gate of the second MOS transistor is electrically connected to the output end of the overvoltage protection circuit, and the source of the second MOS transistor is electrically connected to the negative output end of the battery pack.

[0016] In an embodiment of the present utility model, optionally, the first diode is a constant current diode.

[0017] The present utility model further provides a lithium battery, including the control device of the above lithium battery and a plurality of series-connected battery cells.

[0018] For the control device of a lithium battery and the lithium battery provided by the present utility model, when overcurrent or overvoltage occurs, after the protection module disconnects the connection between the negative electrode of the battery cell and the negative output end of the battery pack, the lithium battery is in a shutdown state. When the load detection module detects that a load is connected, it outputs a load detection signal to the control module and the power conversion module, enabling the power conversion module to be activated. After receiving the load detection signal, the control module outputs an enabling signal to the power conversion module, enabling the lithium battery to maintain an on state, automatically detecting the presence of a load, and automatically turning on the lithium battery without manual intervention, improving the convenience of using the lithium battery. When the intelligent charger is connected to the positive output end and the negative output end of the battery pack, since there is a current less than the preset current value between the input end and the first output end of the load detection module, the voltage at the negative output end of the battery pack is approximately equal to the voltage of the negative electrode of the battery cell, and there is a weak voltage between the negative output end and the positive output end of the battery pack. The intelligent charger detects the voltage between the positive and negative electrodes of the battery pack and charges the lithium battery, also improving the convenience of using the lithium battery.

[0019] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the present utility model more obvious and understandable, the following specifically describes the embodiments of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0021] Figure 1The structural block diagram of a control device for a lithium battery according to an exemplary embodiment of the present invention;

[0022] Figure 2 The circuit structure diagram of a control device for a lithium battery according to an exemplary embodiment of the present invention.

[0023] Among them,

[0024] Figure 1 - Figure 2 The reference numerals are as follows: 11 - control module; 12 - power conversion module; 13 - load detection module; 14 - protection module; 20 - battery cell; 30 - second load; 40 - overcurrent protection circuit; Q10 - triode; R1 - first resistor; R2 - second resistor; R3 - third resistor; R4 - fourth resistor; R5 - fifth resistor; D1 - first diode; D2 - second diode; D3 - third diode; D4 - fourth diode; Q1 - first MOS transistor; Q2 - second MOS transistor; RS14 - sixth resistor; P - negative output terminal of the battery pack; P+ - positive output terminal of the battery pack. Specific embodiments

[0025] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0026] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended utility model purpose, the following, in conjunction with the drawings and preferred embodiments, details the specific embodiments, structures, features, and their effects according to the application of the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0027] The following in conjunction with Figures 1 to 2 Describe a control device for a lithium battery according to some embodiments of the present invention.

[0028] In one embodiment, as Figure 1As shown in the figure, a control device for a lithium battery includes a control module 11, a power conversion module 12, a load detection module 13, and a protection module 14. Among them, the input end of the load detection module 13 is electrically connected to the negative output terminal P- of the battery pack of the lithium battery. The first output end of the load detection module 13 is electrically connected to the negative electrode of the battery cell 20 in the lithium battery. The second output end of the load detection module 13 is respectively electrically connected to the enable signal input end of the power conversion module 12 and the detection signal input end of the control module 11. The enable signal input end of the power conversion module 12 is also electrically connected to the enable signal output end of the control module 11. The positive input end of the power conversion module 12 is electrically connected to the positive output terminal of the battery pack of the lithium battery. The power output end of the power conversion module 12 is electrically connected to the power input end of the control module 11. The first input end of the protection module 14 is electrically connected to the output end of the overcurrent protection circuit 40. The second input end of the protection module 14 is electrically connected to the negative electrode of the battery cell 20. The output end of the protection module 14 is electrically connected to the negative output terminal P- of the battery pack. The start signal output end of the control module 11 is electrically connected to the input end of the overcurrent protection circuit 40.

[0029] Among them, after the protection module 14 disconnects the connection between the negative electrode of the battery cell 20 and the negative output terminal P- of the battery pack, the lithium battery is in the shutdown state. When a load is connected between the negative output terminal P- and the positive output terminal P+ of the battery pack, the first output end and the second output end of the load detection module 13 are conducted, and the third output end of the load detection module 13 outputs a detection load signal to make the lithium battery in the startup state. When no load is connected between the negative output terminal P- and the positive output terminal P+ of the battery pack, there is a current smaller than the preset current value between the first output end and the second output end of the load detection module 13.

[0030] Specifically, when a load is connected between the negative output terminal and the positive output terminal of the battery pack and the current flowing through the load does not exceed the preset overcurrent, the negative electrode of the battery cell is connected to the negative output terminal of the battery pack, and the negative output terminal and the positive output terminal of the battery pack provide voltage for the load. When the current flowing through the load exceeds the preset overcurrent, the protection module disconnects the connection between the negative electrode of the battery cell and the negative output terminal of the battery pack, and at this time the lithium battery is in the shutdown state.

[0031] When a load is connected between the negative output terminal and the positive output terminal of the battery pack (which can be a load during overcurrent or a new load), the load detection module detects the connection of the load. The input terminal and the first output terminal of the load detection module are turned on, and the second output terminal of the load detection module outputs a load detection signal to the power conversion module and the control module. The load detection signal serves as an activation signal for the power conversion module, and the power conversion module outputs a DC power supply to provide the operating voltage for the control module. After receiving the load detection signal, the control module outputs an enable signal to the power conversion module, causing the power conversion module to maintain the on state, that is, the lithium battery is in the on state.

[0032] When the load between the negative output terminal and the positive output terminal of the battery pack is removed, the load detection module detects that no load is connected. There is a current less than the preset current value between the input terminal and the first output terminal of the load detection module, making the voltage at the negative output terminal of the battery pack approximately equal to the voltage of the negative electrode of the battery cell. This current is not sufficient to turn on the connection between the input terminal and the first output terminal of the load detection module, and the second output terminal of the load detection module does not output a load detection signal to the power conversion module and the control module, and the lithium battery remains in the off state.

[0033] When the load is overcurrent and the lithium battery is in the off state, the intelligent charger is connected to the positive output terminal and the negative output terminal of the battery pack. According to the existing lithium battery control device, the intelligent charger cannot detect a voltage output from the battery pack, so the lithium battery is not charged.

[0034] With the lithium battery control device of the present application, when the intelligent charger is connected to the positive output terminal and the negative output terminal of the battery pack, since there is a current less than the preset current value between the input terminal and the first output terminal of the load detection module, the voltage at the negative output terminal of the battery pack is approximately equal to the voltage of the negative electrode of the battery cell, and there is a weak voltage between the negative output terminal and the positive output terminal of the battery pack. The intelligent charger detects a voltage between the positive and negative terminals of the battery pack, activates the protection module, and the protection module outputs a control signal to connect the negative electrode of the battery cell and the negative terminal of the battery pack, and the intelligent charger charges the lithium battery.

[0035] In this embodiment, it should be noted that the functions implemented by the control module can be realized through programs in the prior art. The technical effects achieved by the present application mainly rely on the connection relationships between the modules.

[0036] Compared with the prior art, for the control device of the lithium battery provided by the present utility model, when overcurrent or overvoltage occurs, after the protection module disconnects the connection between the negative electrode of the battery cell and the negative electrode output terminal of the battery pack, the lithium battery is in a shutdown state. When the load detection module detects that a load is connected, it outputs a detected load signal to the control module and the power conversion module, enabling the power conversion module to be activated. After receiving the detected load signal, the control module outputs an enable signal to the power conversion module, enabling the lithium battery to maintain an on state, automatically detecting the presence of a load, and automatically turning on the lithium battery without manual intervention, improving the convenience of using the lithium battery; when the intelligent charger is connected to the positive electrode output terminal and the negative electrode output terminal of the battery pack, since there is a current less than the preset current value between the input terminal and the first output terminal of the load detection module, the voltage at the negative electrode output terminal of the battery pack is approximately equal to the voltage of the negative electrode of the battery cell, and there is a weak voltage between the negative electrode output terminal and the positive electrode output terminal of the battery pack. The intelligent charger detects the voltage between the positive and negative electrodes of the battery pack and charges the lithium battery, also improving the convenience of using the lithium battery.

[0037] In one embodiment, the load detection module includes a first switch, a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. Among them, the anode of the first diode D1 is electrically connected to the negative electrode output terminal of the battery pack, the cathode of the first diode D1 is electrically connected to the anode of the second diode D2, the cathode of the second diode D2 is electrically connected to the first end of the first resistor R1, the second end of the first resistor R1 is respectively electrically connected to the first end of the second resistor R2 and the control input terminal of the first switch, the first output terminal of the first switch is electrically connected to the negative electrode of the battery cell, the second output terminal of the first switch is respectively electrically connected to the cathode of the third diode D3 and the cathode of the fourth diode D4, the anode of the third diode D3 is electrically connected to the enable signal input terminal of the power conversion module, the anode of the fourth diode D4 is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is electrically connected to the detection signal input terminal of the control module 11; the second end of the second resistor R2 is electrically connected to the negative electrode of the battery cell.

[0038] Specifically, the first switch can be a triode, and the first diode is a low-current constant-current diode. The first diode can ensure that the key circuit is applicable to a wide range of battery voltages (different battery voltages can be applicable according to the selection of the first diode), and at the same time ensure relatively small power consumption. The fourth diode is used to protect the first switch and prevent damage to the first switch by reverse voltage spikes. The second diode and the third diode are also used to protect the subsequent circuit and prevent damage to the circuit by reverse voltage spikes.

[0039] In one embodiment, as Figure 2As shown, the first switch is a triode Q1. The base of the triode Q1 is electrically connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2 respectively. The emitter of the triode Q1 is electrically connected to the negative electrode of the battery cell. The collector of the triode Q1 is electrically connected to the cathode of the third diode D3 and the cathode of the fourth diode D4. The anode of the first diode D1 is electrically connected to the negative output terminal of the battery pack. The cathode of the first diode D1 is electrically connected to the anode of the second diode D2. The cathode of the second diode D2 is electrically connected to the first terminal of the first resistor R1. The anode of the third diode D3 is electrically connected to the enable signal input terminal of the power conversion module. The anode of the fourth diode D4 is electrically connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is electrically connected to the detection signal input terminal of the control module 11. The second terminal of the second resistor R2 is electrically connected to the negative electrode of the battery cell.

[0040] Specifically, when a load is connected between the negative output terminal and the positive output terminal of the battery pack, a loop is formed among the positive output terminal of the battery pack, the load, the first diode, the second diode, the first resistor, the second resistor, the base and the emitter of the triode, and the negative electrode of the battery cell. The collector and the emitter of the triode are turned on. The collector of the triode outputs the negative electrode signal of the battery cell as a detection signal. The detection signal is transmitted to the detection signal input terminal of the control module and the enable terminal of the power conversion module, notifying the control module that a load is connected. After receiving the detection signal, the power conversion module is activated and outputs the working voltage of the control module. The control module outputs an enable signal to the power conversion module to keep the power conversion module in an enabled state.

[0041] In one embodiment, as Figure 2 shown, a fourth resistor R4 is provided between the power output terminal of the power conversion module 12 and the power input terminal of the control module 11.

[0042] Specifically, after receiving the detection signal, the power conversion module is activated and outputs the working voltage of the control module. The control module outputs an enable signal, which is transmitted to the power conversion module through the fourth resistor to keep the power conversion module in an enabled state.

[0043] In one embodiment, as Figure 2 shown, the load detection module further includes a fifth resistor R5. The first terminal of the fifth resistor R5 is electrically connected to the second terminal of the third resistor R3 and the detection signal input terminal of the control module 11 respectively. The second terminal of the fifth resistor R5 is electrically connected to the positive output terminal of the power conversion module 12.

[0044] Specifically, when no load is connected to the negative output terminal and the positive output terminal of the battery pack, the voltage of the negative output terminal of the battery pack approaches about 0V, which is the negative electrode of the battery cell, through the circuits of the first diode, the second diode, the first resistor, the second resistor, the base and the emitter of the triode. At this time, the outputs of the negative output terminal and the positive output terminal of the battery pack are slightly less than the voltage of the battery cell. After reaching the stable state, the triode is cut off. After the detection signal input terminal of the control module is briefly pulled low, it is held at a high level through the power conversion module and the fifth resistor, and no effective load detection signal is obtained. A low level is an effective load detection signal.

[0045] In one embodiment, the protection module includes a sixth resistor RS14, a second switch and a third switch. The control input terminal of the second switch is electrically connected to the output terminal of the overcurrent protection circuit 40. The first output terminal of the second switch is electrically connected to the first end of the sixth resistor RS14. The second output terminal of the second switch is electrically connected to the first output terminal of the third switch. The control input terminal of the third switch is electrically connected to the output terminal of the overvoltage protection circuit. The second output terminal of the third switch is electrically connected to the negative output terminal of the battery pack. The second end of the sixth resistor RS14 is electrically connected to the negative electrode of the battery cell.

[0046] Specifically, the overcurrent protection circuit is used to detect the current flowing through the load. When the current flowing through the load exceeds the preset value, the overcurrent protection circuit outputs an overcurrent signal to the control input terminal of the second switch, and the second switch disconnects, disconnecting the connection between the negative electrode of the battery cell and the negative output terminal of the battery pack. The overvoltage protection circuit is used to detect the charging voltage of the battery. When the charging voltage exceeds the preset voltage value, the overvoltage protection circuit outputs an overvoltage signal to the control input terminal of the third switch, and the third switch disconnects, disconnecting the connection between the negative electrode of the battery cell and the negative output terminal of the battery pack.

[0047] In one embodiment, as Figure 2 shown, the second switch is the first MOS transistor Q1, and the third switch is the second MOS transistor Q2. Among them, the gate of the first MOS transistor Q1 is electrically connected to the output terminal of the overcurrent protection circuit 40. The source of the first MOS transistor Q1 is electrically connected to the first end of the sixth resistor RS14. The drain of the first MOS transistor Q1 is electrically connected to the drain of the second MOS transistor Q2. The gate of the second MOS transistor Q2 is electrically connected to the output terminal of the overvoltage protection circuit. The source of the second MOS transistor Q2 is electrically connected to the negative output terminal of the battery pack.

[0048] Specifically, the second switch is a first MOS transistor, or may be multiple first MOS transistors. When the gate voltage of the first MOS transistor is less than the source voltage, the first MOS transistor is not turned on, disconnecting the connection between the negative electrode of the battery cell and the negative electrode output terminal of the battery pack. The third switch is a second MOS transistor, or may be multiple second MOS transistors. When the gate voltage of the second MOS transistor is less than the source voltage, the second MOS transistor is not turned on, disconnecting the connection between the negative electrode of the battery cell and the negative electrode output terminal of the battery pack.

[0049] The present utility model also provides a lithium battery, including the control device of the above lithium battery and multiple battery cells connected in series.

[0050] In the lithium battery provided by the present utility model, when overcurrent or overvoltage occurs, after the protection module disconnects the connection between the negative electrode of the battery cell and the negative electrode output terminal of the battery pack, the lithium battery is in a shutdown state. When the load detection module detects that a load is connected, it outputs a load detection signal to the control module and the power conversion module, enabling the power conversion module to be activated. After receiving the load detection signal, the control module outputs an enable signal to the power conversion module, enabling the lithium battery to remain in an on state, automatically detecting the presence of a load, and automatically turning on the lithium battery without manual intervention, improving the convenience of using the lithium battery; when the intelligent charger is connected to the positive electrode output terminal and the negative electrode output terminal of the battery pack, since there is a current less than the preset current value between the input terminal and the first output terminal of the load detection module, the voltage at the negative electrode output terminal of the battery pack is approximately equal to the voltage of the negative electrode of the battery cell, and there is a weak voltage between the negative electrode output terminal and the positive electrode output terminal of the battery pack. The intelligent charger detects the voltage between the positive and negative electrodes of the battery pack and charges the lithium battery, also improving the convenience of using the lithium battery.

[0051] It should be understood that various modifications can be made to the embodiments applied herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present application.

[0052] The drawings included in and forming a part of the specification illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, are used to explain the principles of the present application.

[0053] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given by way of non-limiting examples with reference to the accompanying drawings.

[0054] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application.

[0055] When combined with the accompanying drawings, the above and other aspects, features, and advantages of the present application will become more apparent in view of the following detailed description.

[0056] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present application and that it can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present application with unnecessary or redundant details. Thus, the specific structural and functional details claimed herein are not intended to be limiting, but rather are merely a basis and representative basis for the claims to teach those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0057] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments according to the present application.

[0058] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A lithium battery control device, characterized in that: The control device of the lithium battery includes a control module, a power conversion module, a load detection module and a protection module, wherein: The input end of the load detection module is electrically connected to the negative electrode output end of the battery pack of the lithium battery, the first output end of the load detection module is electrically connected to the negative electrode of the battery cell in the lithium battery, and the second output end of the load detection module is electrically connected to the enable signal input end of the power conversion module and the detection signal input end of the control module respectively; the enable signal input end of the power conversion module is also electrically connected to the enable signal output end of the control module, the positive electrode input end of the power conversion module is electrically connected to the positive electrode output end of the battery pack of the lithium battery, and the power output end of the power conversion module is electrically connected to the power input end of the control module; the first input end of the protection module is electrically connected to the output end of the overcurrent protection circuit, the second input end of the protection module is electrically connected to the negative electrode of the battery cell, and the output end of the protection module is electrically connected to the negative electrode output end of the battery pack; the start signal output end of the control module is electrically connected to the input end of the overcurrent protection circuit; Among them, when the protection module disconnects the connection between the negative electrode of the battery cell and the negative electrode output terminal of the battery pack, the lithium battery is in a shutdown state. When a load is connected between the negative electrode output terminal of the battery pack and the positive electrode output terminal of the battery pack, the input terminal and the first output terminal of the load detection module are turned on, and the second output terminal of the load detection module outputs a load detection signal to put the lithium battery in a power-on state; when no load is connected between the negative electrode output terminal of the battery pack and the positive electrode output terminal of the battery pack, there is a current less than a preset current value between the input terminal and the first output terminal of the load detection module.

2. The lithium battery control device according to claim 1, characterized in that: The load detection module includes a first switch, a first resistor, a second resistor, a third resistor, a first diode, a second diode, a third diode and a fourth diode, wherein: The anode of the first diode is electrically connected to the negative output terminal of the battery pack, the cathode of the first diode is electrically connected to the anode of the second diode, the cathode of the second diode is electrically connected to the first end of the first resistor, the second end of the first resistor is electrically connected to the first end of the second resistor and the control input terminal of the first switch, the first output terminal of the first switch is electrically connected to the negative electrode of the battery cell, the second output terminal of the first switch is electrically connected to the cathode of the third diode and the cathode of the fourth diode, the anode of the third diode is electrically connected to the enable signal input terminal of the power conversion module, the anode of the fourth diode is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the detection signal input terminal of the control module; the second end of the second resistor is electrically connected to the negative electrode of the battery cell.

3. The lithium battery control device according to claim 2, characterized in that: The first switch is a transistor, wherein the base of the transistor is electrically connected to the second end of the first resistor and the first end of the second resistor respectively, the emitter of the transistor is electrically connected to the negative electrode of the battery cell, and the collector of the transistor is electrically connected to the cathode of the third diode and the cathode of the fourth diode.

4. The lithium battery control device according to claim 2, characterized in that: A fourth resistor is provided between the power output terminal of the power conversion module and the power input terminal of the control module.

5. The lithium battery control device according to claim 2, characterized in that: The load detection module also includes a fifth resistor, a first end of the fifth resistor is electrically connected to the second end of the third resistor and the detection signal input end of the control module respectively, and a second end of the fifth resistor is electrically connected to the positive output end of the power conversion module.

6. The lithium battery control device according to claim 1, characterized in that: The protection module includes a sixth resistor, a second switch and a third switch, the control input end of the second switch is electrically connected to the output end of the overcurrent protection circuit, the first output end of the second switch is electrically connected to the first end of the sixth resistor, the second output end of the second switch is electrically connected to the first output end of the third switch, the control input end of the third switch is electrically connected to the output end of the overvoltage protection circuit, the second output end of the third switch is electrically connected to the negative electrode output end of the battery pack; the second end of the sixth resistor is electrically connected to the negative electrode of the battery cell.

7. The lithium battery control device according to claim 6, characterized in that: The second switch is a first MOS transistor, and the third switch is a second MOS transistor, wherein: The gate of the first MOS tube is electrically connected to the output end of the overcurrent protection circuit, the source of the first MOS tube is electrically connected to the first end of the sixth resistor, the drain of the first MOS tube is electrically connected to the drain of the second MOS tube, the gate of the second MOS tube is electrically connected to the output end of the overvoltage protection circuit, and the source of the second MOS tube is electrically connected to the negative output end of the battery pack.

8. The control device for a lithium battery according to any one of claims 2 to 5, characterized in that: The first diode is a constant current diode.

9. A lithium battery, characterized in that: A control device for a lithium battery comprising any one of claims 1 to 8 and a plurality of battery cells connected in series.

Images