Lithium battery system

Abstract

The utility model provides a lithium battery system, and belongs to the technical field of lithium battery protection, and the lithium battery system comprises a battery cell module, a first temperature detection module, a second temperature detection module, a reference voltage module, a control module and a switch module. The battery cell module is electrically connected with the first temperature detection module and the reference voltage module respectively; the distance between the second temperature detection module and the switch module is smaller than a preset distance threshold value; the input end of the control module is electrically connected with the first temperature detection module, the reference voltage module and the second temperature detection module. The output end of the control module is electrically connected with the switch module. The switch module is also electrically connected with the battery cell module; and the switch module is used for disconnecting the working circuit of the battery cell module under the condition that the temperature of the battery cell module or the temperature of the switch module is not within a preset temperature range. The problem of safety accidents caused by control failure due to damage caused by over-high temperature of the switch can be avoided, and the safety of the lithium battery system can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of lithium battery protection, and in particular, relates to a lithium battery system. Background Art

[0002] In order to increase the charging speed of lithium batteries, fast charging technology is becoming more and more popular, and the output power of chargers is increasing. The heat generated during the charging process can easily cause the lithium battery temperature to be too high, resulting in fire or explosion accidents. When the temperature of lithium batteries is too high during discharge, it may also cause short circuits, combustion, or even explosions.

[0003] In the related art, the temperature of the lithium battery cell is detected and the lithium battery is controlled to stop working when the cell temperature is too high, thereby protecting the lithium battery from temperature. However, if the temperature of the lithium battery is too high, the components of the control circuit in the lithium battery may be damaged, causing the lithium battery to fail to stop working immediately and causing a safety accident. Utility Model Content

[0004] The present application provides a lithium battery system to solve the problem that the components of the control circuit in the lithium battery are damaged due to the excessive temperature of the lithium battery, resulting in the lithium battery being unable to stop working immediately and causing a safety accident.

[0005] A lithium battery system provided in the present application includes: a battery cell module, a first temperature detection module, a second temperature detection module, a reference voltage module, a control module and a switch module;

[0006] The battery cell module is electrically connected to the first temperature detection module and the reference voltage module respectively;

[0007] The distance between the second temperature detection module and the switch module is less than a preset distance threshold;

[0008] The input end of the control module is electrically connected to the first temperature detection module, the reference voltage module and the second temperature detection module respectively, and the output end of the control module is electrically connected to the switch module;

[0009] The switch module is also electrically connected to the battery cell module; the switch module is used to disconnect the working circuit of the battery cell module when the temperature of the battery cell module or the temperature of the switch module is not within a preset temperature range.

[0010] Optionally, the control module includes: a comparison unit and a control unit;

[0011] The input end of the comparison unit is electrically connected to the first temperature detection module and the reference voltage module respectively, and the output end of the comparison unit is electrically connected to the input end of the control unit;

[0012] The input end of the control unit is also electrically connected to the second temperature detection module, and the output end of the control unit is electrically connected to the switch module.

[0013] Optionally, the control module includes: a positive voltage input terminal and a negative voltage input terminal; the reference voltage module includes: a first resistor and a first capacitor;

[0014] One end of the first resistor is electrically connected to the positive electrode of the battery module, and the other end of the first resistor is electrically connected to the first capacitor and the positive voltage input terminal respectively;

[0015] The first capacitor is also electrically connected to the negative voltage input terminal and the negative electrode of the battery cell module respectively.

[0016] Optionally, the control module further includes: a first temperature detection terminal; the first temperature detection module includes: a first thermistor;

[0017] One end of the first thermistor is electrically connected to the first temperature detection end, and the other end of the first thermistor is electrically connected to the negative electrode of the battery cell module and the negative voltage input end respectively.

[0018] Optionally, the first thermistor is connected to a tab of the battery cell module to detect the temperature at the tab.

[0019] Optionally, the control module includes: a second temperature detection terminal; the second temperature detection module includes: a second thermistor;

[0020] One end of the second thermistor is electrically connected to the second temperature detection end, and the other end of the second thermistor is electrically connected to the positive electrode of the battery cell module.

[0021] Optionally, the control module includes: a discharge control terminal and a charge control terminal; the switch module includes: a first transistor and a second transistor;

[0022] The first electrode of the first transistor is electrically connected to the first electrode of the second transistor, the second electrode of the first transistor is electrically connected to the negative electrode of the battery cell module, and the control electrode of the first transistor is electrically connected to the discharge control terminal;

[0023] The control electrode of the second transistor is electrically connected to the charging control terminal.

[0024] Optionally, the first transistor is an N-channel field effect transistor; the control electrode of the first transistor is the gate of the N-channel field effect transistor; the first electrode of the first transistor is the drain of the N-channel field effect transistor; and the second electrode of the first transistor is the source of the N-channel field effect transistor.

[0025] Optionally, the second transistor is an N-channel field effect transistor; the control electrode of the second transistor is the gate of the N-channel field effect transistor; the first electrode of the second transistor is the drain of the N-channel field effect transistor; and the second electrode of the second transistor is the source of the N-channel field effect transistor.

[0026] Optionally, the second temperature detection module includes: a second thermistor; the distance between the second thermistor and the first transistor is less than the preset distance threshold, and / or the distance between the second thermistor and the second transistor is less than the preset distance threshold.

[0027] In the embodiment of the present application, since the battery cell module is electrically connected to the first temperature detection module and the reference voltage module respectively, and the input end of the control module is electrically connected to the first temperature detection module and the reference voltage module respectively, in actual application, the control module can obtain the temperature data of the battery cell module, that is, the battery cell temperature of the lithium battery system, according to the signals sent by the first temperature detection module and the reference voltage module. Since the distance between the second temperature detection module and the switch module is less than the preset distance threshold, the input end of the control module is electrically connected to the second temperature detection module, and in actual application, the control module can obtain the temperature data of the switch module according to the signal sent by the second temperature detection module. Since the output end of the control module is electrically connected to the switch module, and the switch module is also electrically connected to the battery cell module, the control module can send a control signal to the switch module when the temperature of the battery cell module or the temperature of the switch module is not within the preset temperature range, and control the switch module to disconnect the working circuit of the battery cell module, so that the battery cell module stops working. In this way, the temperatures of the battery cell module and the switch module can be detected respectively. When the temperature of the battery cell module or the switch module is not within the preset temperature range, the battery cell module can be controlled to stop working, thereby stopping the lithium battery system from working. This can avoid the problem of the switch module being damaged due to excessive temperature, causing lithium battery control failure and leading to safety accidents. Through the temperature detection of the first temperature detection module and the second temperature detection module, dual protection of the battery cell module and the switch module can be achieved, thereby improving the safety of the lithium battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is one of the circuit structure diagrams of a lithium battery system provided in an embodiment of the present application;

[0030] Figure 2This is the second circuit structure diagram of a lithium battery system provided in an embodiment of the present application;

[0031] Figure 3 This is a circuit diagram of a control module in a lithium battery system provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] Lithium battery system 10; battery cell module 101; first temperature detection module 102; first thermistor 1021; second temperature detection module 103; second thermistor 1031; reference voltage module 104; first resistor 1041; first capacitor 1042; control module 105; comparison unit 1051; control unit 1052; positive voltage input terminal 1053; negative voltage input terminal 1054; first temperature detection terminal 1055; second temperature detection terminal 1056; discharge control terminal 1057; charge control terminal 1058; switch module 106; first transistor 1061; second transistor 1062. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Figure 1 is one of the circuit structure diagrams of a lithium battery system provided in an embodiment of the present application, such as Figure 1 As shown, the lithium battery system 10 includes: a battery cell module 101, a first temperature detection module 102, a second temperature detection module 103, a reference voltage module 104, a control module 105 and a switch module 106;

[0036] The battery cell module 101 is electrically connected to the first temperature detection module 102 and the reference voltage module 104 respectively;

[0037] The distance between the second temperature detection module 103 and the switch module 106 is less than a preset distance threshold;

[0038] The input end of the control module 105 is electrically connected to the first temperature detection module 102, the reference voltage module 104 and the second temperature detection module 103 respectively, and the output end of the control module 105 is electrically connected to the switch module 106;

[0039] The switch module 106 is also electrically connected to the cell module 101 ; the switch module 106 is used to disconnect the working circuit of the cell module 101 when the temperature of the cell module 101 or the temperature of the switch module 106 is not within a preset temperature range.

[0040] In the embodiment of the present application, the battery cell module 101 includes a positive electrode and a negative electrode. The number of battery cells in the battery cell module 101 is not limited in the embodiment of the present application. The first temperature detection module 102 is used to detect the temperature of the lithium battery cell. The first temperature detection module 102 and the second temperature detection module 103 can use thermistors, such as positive temperature coefficient thermistors (Positive Temperature Coefficient, PTC) and negative temperature coefficient thermistors (Negative Temperature Coefficient, NTC). In practical applications, the control module 105 can be a protection chip of the lithium battery, which is used to control the on and off of the peripheral switch circuit according to the temperature detection result to achieve the temperature protection function of the lithium battery. The switch module 106 may include a metal-oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-EffectTransistor, MOSFET), such as an N-channel MOS tube, namely NMOS, or a P-channel MOS tube, namely PMOS. This is only an example to illustrate that the embodiment of the present application is not limited to this.

[0041] In the embodiment of the present application, the first temperature detection module 102 can perform temperature detection on the battery cell module 101, obtain a temperature voltage signal, and send the temperature voltage signal to the control module 105. The reference voltage module 104 can generate a reference voltage signal according to the output voltage of the battery cell module 101, and send the reference voltage signal to the control module 105. The second temperature detection module 103 can perform temperature detection on the switch module 106, obtain first temperature data, and send the first temperature data to the control module 105. The control module 105 can obtain second temperature data according to the reference voltage signal and the temperature voltage signal, and generate a control signal when the first temperature data indicates that the temperature of the battery cell module 101 is not within the preset temperature range, or when the second temperature data indicates that the temperature of the switch module 106 is not within the preset temperature range, and send the control signal to the switch module 106. The switch module 106 can disconnect the working circuit of the battery cell module 101 in response to the control signal, so that the battery cell module 101 stops working.

[0042] In the embodiment of the present application, since the cell module 101 is electrically connected to the first temperature detection module 102 and the reference voltage module 104, respectively, and the input end of the control module 105 is electrically connected to the first temperature detection module 102 and the reference voltage module 104, respectively, in actual applications, the control module 105 can obtain the temperature data of the cell module 101, that is, the cell temperature of the lithium battery system 10, according to the signals sent by the first temperature detection module 102 and the reference voltage module 104. Since the distance between the second temperature detection module 103 and the switch module 106 is less than the preset distance threshold, the input end of the control module 105 is electrically connected to the second temperature detection module 103, and in actual applications, the control module 105 can obtain the temperature data of the switch module 106 according to the signals sent by the second temperature detection module 103. Since the output end of the control module 105 is electrically connected to the switch module 106, and the switch module 106 is also electrically connected to the battery module 101, the control module 106 can send a control signal to the switch module 106 when the temperature of the battery module 101 or the temperature of the switch module 106 is not within the preset temperature range, and control the switch module 106 to disconnect the working circuit of the battery module 101, so that the battery module 101 stops working. In this way, the temperature of the battery module 101 and the switch module 106 can be detected respectively, and when the temperature of the battery module 101 or the switch module 106 is not within the preset temperature range, the battery module 101 is controlled to stop working, so that the lithium battery system 10 stops working, and the problem of damage to the switch module 106 due to excessive temperature, resulting in failure of lithium battery control and causing safety accidents can be avoided. The temperature detection of the first temperature detection module 102 and the second temperature detection module 103 can be used to achieve dual protection of the battery module 101 and the switch module 106, and the safety of the lithium battery system 10 can be improved.

[0043] Optionally, the control module 105 includes: a comparison unit 1051 and a control unit 1052;

[0044] The input end of the comparison unit 1051 is electrically connected to the first temperature detection module 102 and the reference voltage module 104 respectively, and the output end of the comparison unit 1051 is electrically connected to the control unit 1052;

[0045] The input end of the control unit 1052 is also electrically connected to the second temperature detection module 103 , and the output end of the control unit 1052 is electrically connected to the switch module 106 .

[0046] In the embodiment of the present application, the comparison unit 1051 can receive the reference voltage signal sent by the reference voltage module 104 and the temperature voltage signal sent by the first temperature detection module 102, and compare the reference voltage signal and the temperature voltage signal to obtain the temperature of the battery cell module 101, that is, the second temperature data, and send the second temperature data to the control unit 1052. The control unit 1052 can generate a first control signal when the first temperature data corresponding to the switch module 106 indicates that the temperature of the switch module 106 is not within the preset temperature range, or generate a second control signal when the second temperature data indicates that the temperature of the battery cell module 101 is not within the preset temperature range, and send the first control signal or the second control signal to the switch module 106.

[0047] Specifically, the comparison unit 1051 can compare the voltage division of the reference voltage module 104 by the first temperature detection module 102 with the reference voltage signal generated by the reference voltage module 104, determine the temperature of the battery cell module 101 according to the comparison result, and output it to the control unit 1052 as second temperature data.

[0048] In the embodiment of the present application, the preset temperature range may include the operating temperature range of the battery cell module 101 and the switch module 106. For example, the charging temperature range of the battery cell module 101 is 0-45°C. The switch module 106 may disconnect the working circuit of the battery cell module 101 in response to the first control signal or the second control signal, so that the battery cell module 101 stops working.

[0049] In the embodiment of the present application, the comparison unit 1051 can obtain the temperature data of the battery cell module 101 according to the size relationship between the signal sent by the first temperature detection module 102 and the signal sent by the reference voltage module 104, thereby realizing temperature detection of the battery cell module 101. The control unit 1052 can obtain the temperature data of the battery cell module 101 and the temperature data of the switch module 106 sent by the second temperature detection module 103. When the temperature of the switch module 106 or the temperature of the battery cell module 101 is not within a preset temperature range, the working circuit of the battery cell module 101 can be disconnected in time to stop the battery cell module 101 from working. The control logic is simple, and the required circuit elements are relatively few, which can reduce the hardware cost of the lithium battery system 10.

[0050] Optionally, the control module 105 includes: a positive voltage input terminal 1053 and a negative voltage input terminal 1054; the reference voltage module 104 includes: a first resistor 1041 and a first capacitor 1042;

[0051] One end of the first resistor 1041 is electrically connected to the positive electrode of the battery cell module 101 , and the other end of the first resistor 1041 is electrically connected to the first capacitor 1042 and the positive voltage input terminal 1053 respectively;

[0052] The first capacitor 1042 is also electrically connected to the negative voltage input terminal 1054 and the negative electrode of the battery cell module 101 , respectively.

[0053] In the embodiment of the present application, the output voltage signal of the battery cell module 101 can be divided by the first resistor 1041, and a reference voltage signal can be obtained to input the positive voltage input terminal 1053 of the control module 105. The output voltage signal of the battery cell module 101 can be filtered by the first capacitor 1042, thereby improving the signal quality of the reference voltage signal, and improving the accuracy of the temperature of the battery cell module 101 obtained according to the reference voltage signal, that is, the second temperature data.

[0054] Optionally, the control module 105 further includes: a first temperature detection terminal 1055; the first temperature detection module 102 includes: a first thermistor 1021;

[0055] One end of the first thermistor 1021 is electrically connected to the first temperature detection end 1055 , and the other end of the first thermistor 1021 is electrically connected to the negative electrode of the battery cell module 101 and the negative voltage input end 1054 , respectively.

[0056] In the embodiment of the present application, the first thermistor 1021 may be an NTC. One end of the first thermistor 1021 is electrically connected to the first temperature detection end 1055 of the control module 105, and the other end is electrically connected to the negative electrode of the battery cell module 101 and the negative voltage input end 1054 of the control module 105, respectively. The resistance of the first thermistor 1021 changes with the temperature of the battery cell module 101, so that the temperature voltage signal input to the control module 105 also changes with the temperature. The control module 101 can determine the temperature of the battery cell module 101 and obtain the second temperature data by comparing the temperature voltage signal with the reference voltage signal according to the change of the temperature voltage signal.

[0057] In the embodiment of the present application, since the two ends of the first thermistor 1021 are directly electrically connected to the negative voltage input terminal 1054 and the first temperature detection terminal 1055 of the control module 105, respectively, the resistance of the first thermistor 1021 changes with the temperature of the battery cell module 101, and the corresponding voltage change on the first thermistor 1021 can be directly transmitted to the control module 105, which can reduce the transmission delay and improve the control timeliness of the control module 105, thereby improving the safety of the lithium battery system 10.

[0058] Optionally, the first thermistor 1021 is connected to a tab of the battery cell module 101 to detect the temperature at the tab.

[0059] In the embodiment of the present application, the first thermistor 1021 may be a surface mount thermistor, and the first thermistor 1021 may be bonded to the tab of the cell module 101, for example, an NTC material package is mounted on the cell tab, thereby detecting the temperature at the tab of the cell module 101. The cell temperature detection accuracy may be improved, thereby improving the battery safety factor.

[0060] Optionally, the control module 105 includes: a second temperature detection terminal 1056; the second temperature detection module 103 includes: a second thermistor 1031;

[0061] One end of the second thermistor 1031 is electrically connected to the second temperature detection end 1056 , and the other end of the second thermistor 1031 is electrically connected to the positive electrode of the battery cell module 101 .

[0062] In the embodiment of the present application, the second thermistor 1031 may be a PTC. One end of the second thermistor 1031 is electrically connected to the second temperature detection end 1056 of the control module 105, and the other end is electrically connected to the positive electrode of the battery cell module 101. The resistance of the second thermistor 1031 changes with the temperature of the switch module 106, so that the first temperature data input to the control module 105 also changes with the temperature, and the control module 105 can determine the temperature of the switch module 106 according to the first temperature data.

[0063] In the embodiment of the present application, since one end of the second thermistor 1031 is directly electrically connected to the second temperature detection end 1056 of the control module 105, and the other end of the second thermistor 1031 is electrically connected to the positive electrode of the telecommunication module 101, the resistance of the second thermistor 1031 changes with the temperature change of the switch module 106, and the voltage change corresponding to the second thermistor 1031 can be directly transmitted to the control module 105, which can reduce the transmission delay and improve the control timeliness of the control module 105, thereby improving the safety of the lithium battery system 10.

[0064] Optionally, the control module 105 includes: a discharge control terminal 1057 and a charge control terminal 1058; the switch module 106 includes: a first transistor 1061 and a second transistor 1062;

[0065] The first electrode of the first transistor 1061 is electrically connected to the first electrode of the second transistor 1062, the second electrode of the first transistor 1061 is electrically connected to the negative electrode of the battery cell module 101, and the control electrode of the first transistor 1061 is electrically connected to the discharge control terminal 1057;

[0066] The control electrode of the second transistor 1062 is electrically connected to the charging control terminal 1058 .

[0067] In the embodiment of the present application, the first transistor 1061 and the second transistor 1062 may be two NMOSs connected in reverse series, or two PMOSs connected in reverse series, which are used to cut off the current in the bidirectional circuit and perform overcurrent protection and temperature protection on the lithium battery system 10. The two MOS tubes may be connected to a common drain or a common source, which is not limited in the embodiment of the present application.

[0068] In the embodiment of the present application, the first transistor 1061 can be disconnected under the control of the stop discharge signal sent by the discharge control terminal 1057, and the second transistor 1062 can be disconnected under the control of the stop charge signal sent by the charge control terminal 1058. In practical applications, the second electrode of the second transistor 1062 can be electrically connected to the negative electrode of the lithium battery system 10, so that when the first transistor 1061 or the second transistor 1062 is disconnected, the charge and discharge path of the battery module 101 can be disconnected, so that the battery module 101 stops charging and discharging.

[0069] In the embodiment of the present application, the control module 105 can output a stop discharge signal to the first transistor 1061 through the discharge control terminal 1057 to control the first transistor 1061 to be disconnected, thereby controlling the battery cell module 101 to stop discharging. The control module 105 can output a stop charge signal to the second transistor 1062 through the charge control terminal 1058 to control the second transistor 1062 to be disconnected, thereby controlling the battery cell module 101 to stop charging.

[0070] In the embodiment of the present application, the control electrode of the first transistor 1061 is electrically connected to the discharge control terminal 1057, and the first transistor 1061 can be used as a discharge control switch of the lithium battery system 10. The control electrode of the second transistor 1062 is electrically connected to the charge control terminal 1058, and the second transistor 1062 can be used as a charge control switch of the lithium battery system 10. The control module 105 can control the first transistor 1061 and the second transistor 1062 to be disconnected through the discharge control terminal 1057 and the charge control terminal 1058, respectively, so as to control the lithium battery system 10 to stop discharging or charging. The first electrode of the first transistor 1061 is electrically connected to the first electrode of the second transistor 1062, and the first transistor 1061 and the second transistor 1062 are reversely connected in series, which can cut off the current in the circuit in both directions, so that when the battery cell temperature 101 or the switch module 106 is not within the preset temperature range, the working circuit of the battery cell module 101 can be conveniently disconnected through the first transistor 1061 or the second transistor 1062, which can improve the practicality of the lithium battery system 10.

[0071] Optionally, the first transistor 1061 is an N-channel field effect transistor; the control electrode of the first transistor 1061 is the gate of the N-channel field effect transistor; the first electrode of the first transistor 1061 is the drain of the N-channel field effect transistor; and the second electrode of the first transistor 1061 is the source of the N-channel field effect transistor.

[0072] Optionally, the second transistor 1062 is an N-channel field effect transistor; the control electrode of the second transistor 1062 is the gate of the N-channel field effect transistor; the first electrode of the second transistor 1062 is the drain of the N-channel field effect transistor; and the second electrode of the second transistor 1062 is the source of the N-channel field effect transistor.

[0073] In an embodiment of the present application, the first transistor 1061 and the second transistor 1062 may be two NMOSs connected in reverse series, used to cut off the current in a bidirectional circuit. Among them, the two NMOSs may be connected with a common drain. The drain of the first transistor 1061 is electrically connected to the drain of the second transistor 1062, the source of the first transistor 1061 is electrically connected to the negative electrode of the battery cell module 101, and the gate of the first transistor 1061 is electrically connected to the discharge control terminal 1057. Among them, the high level of NMOS is effective, and the stop discharge signal sent by the discharge control terminal 1057 may be a low level signal. The first transistor 1061 is disconnected under the control of the stop discharge signal, thereby disconnecting the discharge path of the battery cell module 101, so that the battery cell module 101 stops discharging.

[0074] In the embodiment of the present application, the gate of the second transistor 1062 is electrically connected to the charging control terminal 1058, and the source of the second transistor 1062 can be electrically connected to the negative electrode of the lithium battery system 10. The stop charging signal sent by the charging control terminal 1058 can be a low level signal. The second transistor 1062 is disconnected under the control of the stop charging signal, thereby disconnecting the charging path of the battery module 101, so that the battery module 101 stops charging.

[0075] Optionally, the second temperature detection module 103 includes: a second thermistor 1031; the distance between the second thermistor 1031 and the first transistor 1061 is less than the preset distance threshold, and / or the distance between the second thermistor 1031 and the first transistor 1061 is less than the preset distance threshold.

[0076] In the embodiment of the present application, the second thermistor 1031 can be arranged near the first transistor 1061 and / or the second thermistor 1031. For example, the second thermistor 1031 can be a surface mount thermistor, and the second thermistor 1031 can be bonded to the first transistor 1061 and / or the second thermistor 1031. The number of the second thermistors 1031 can be determined according to the number of the first transistors 1061 and the second transistors 1062. One second thermistor 1031 can be bonded to one transistor to detect the temperature of the transistor. The accuracy of transistor temperature detection can be improved, thereby improving the safety factor of the battery.

[0077] Figure 2 This is a second circuit diagram of a lithium battery system provided in an embodiment of the present application. Figure 2As shown, the lithium battery system 10 includes: a battery cell module 101, a first temperature detection module 102, a second temperature detection module 103, a reference voltage module 104, a control module 105 and a switch module 106. Among them, the control module 105 includes: a comparison unit 1051, a control unit 1052, a positive voltage input terminal 1053, a negative voltage input terminal 1054, a first temperature detection terminal 1055, a second temperature detection terminal 1056, a discharge control terminal 1057 and a charge control terminal 1058. The reference voltage module 104 includes: a first resistor 1041 and a first capacitor 1042. The first temperature detection module 102 includes: a first thermistor 1021. The second temperature detection module 103 includes: a second thermistor 1031. The switch module 106 includes: a first transistor 1061 and a second transistor 1062. One end of the first resistor 1041 is electrically connected to the positive electrode of the battery cell module 101, and the other end is electrically connected to the first capacitor 1042 and the positive voltage input terminal 1053 respectively; the first capacitor 1042 is also electrically connected to the negative voltage input terminal 1054 and the negative electrode of the battery cell module 101 respectively. One end of the second thermistor 1031 is electrically connected to the second temperature detection terminal 1056, and the other end is electrically connected to the positive electrode of the battery cell module 101. One end of the first thermistor 1021 is electrically connected to the first temperature detection terminal 1055, and the other end is electrically connected to the negative voltage input terminal 1054 and the negative electrode of the battery cell module 101 respectively. The input end of the comparison unit 1051 is electrically connected to the first temperature detection terminal 1055, the positive voltage input terminal 1053 and the negative voltage input terminal 1054 respectively, and the output end of the comparison unit 1051 is electrically connected to the control unit 1052. The input end of the control unit 1052 is electrically connected to the second temperature detection end 1056, and the output end of the control unit 1052 is electrically connected to the control electrode of the first transistor 1061 and the control electrode of the second transistor 1062, respectively. The first electrode of the first transistor 1061 is electrically connected to the first electrode of the second transistor 1062, the second electrode of the first transistor 1061 is connected to the negative electrode of the battery cell module 101 through a resistor, and the control electrode of the first transistor 1061 is electrically connected to the discharge control end 1057. The control electrode of the second transistor 1062 is electrically connected to the charging control end 1058, and the second electrode of the second transistor 1062 is electrically connected to the negative electrode of the lithium battery system 10. The control module 105 also includes a VM (overcurrent, short-circuit protection voltage detection) end, the VM end is electrically connected to the control unit 1052, and the second electrode of the second transistor 1062 is also connected to the VM end through a resistor. The control unit 1052 can realize overcurrent and short-circuit protection of the circuit by detecting the voltage at the VM end.

[0078] Figure 3 is a circuit diagram of a control module 105 in a lithium battery system 10 provided in an embodiment of the present application, such as Figure 3As shown, the control module 105 may include: a comparison unit 1051 and a control unit 1052. VDD-positive power input terminal, battery positive voltage connection terminal, that is, positive voltage input terminal 1053. VSS-ground terminal, negative power input terminal, battery negative voltage connection terminal, that is, negative voltage input terminal 1054. TH-connected to NTC for temperature protection, that is, a first temperature detection terminal 1055. The input terminal of the comparison unit 1051 is electrically connected to the VDD terminal, the TH terminal and the VSS terminal respectively. CTL-connected to PTC for temperature protection, that is, a second temperature detection terminal 1056. DO-MOSFET gate connection terminal for discharge control, that is, discharge control terminal 1057. CO-MOSFET gate connection terminal for charge control, that is, charge control terminal 1058. VM-overcurrent detection terminal, charger detection terminal. The input terminal of the control unit 1052 is electrically connected to the CTL terminal and the VM terminal respectively, and the output terminal of the control unit 1052 is electrically connected to the DO terminal and the CO terminal respectively.

[0079] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation of the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0080] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0081] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A lithium battery system (10), characterized in that: include: A battery cell module (101), a first temperature detection module (102), a second temperature detection module (103), a reference voltage module (104), a control module (105) and a switch module (106); The battery cell module (101) is electrically connected to the first temperature detection module (102) and the reference voltage module (104) respectively; The distance between the second temperature detection module (103) and the switch module (106) is less than a preset distance threshold; The input end of the control module (105) is electrically connected to the first temperature detection module (102), the reference voltage module (104) and the second temperature detection module (103), respectively, and the output end of the control module (105) is electrically connected to the switch module (106); The switch module (106) is also electrically connected to the battery cell module (101); the switch module (106) is used to disconnect the working circuit of the battery cell module (101) when the temperature of the battery cell module (101) or the temperature of the switch module (106) is not within a preset temperature range.

2. The lithium battery system (10) according to claim 1, characterized in that: The control module (105) comprises: a comparison unit (1051) and a control unit (1052); The input end of the comparison unit (1051) is electrically connected to the first temperature detection module (102) and the reference voltage module (104) respectively, and the output end of the comparison unit (1051) is electrically connected to the input end of the control unit (1052); The input end of the control unit (1052) is also electrically connected to the second temperature detection module (103), and the output end of the control unit (1052) is electrically connected to the switch module (106).

3. The lithium battery system (10) according to claim 1, characterized in that: The control module (105) comprises: a positive voltage input terminal (1053) and a negative voltage input terminal (1054); the reference voltage module (104) comprises: a first resistor (1041) and a first capacitor (1042); One end of the first resistor (1041) is electrically connected to the positive electrode of the battery cell module (101), and the other end of the first resistor (1041) is electrically connected to the first capacitor (1042) and the positive voltage input terminal (1053), respectively; The first capacitor (1042) is also electrically connected to the negative voltage input terminal (1054) and the negative electrode of the battery cell module (101), respectively.

4. The lithium battery system (10) according to claim 3, characterized in that: The control module (105) further comprises: a first temperature detection terminal (1055); the first temperature detection module (102) comprises: a first thermistor (1021); One end of the first thermistor (1021) is electrically connected to the first temperature detection end (1055), and the other end of the first thermistor (1021) is electrically connected to the negative electrode of the battery cell module (101) and the negative voltage input end (1054), respectively.

5. The lithium battery system (10) according to claim 4, characterized in that: The first thermistor (1021) is connected to a tab of the battery cell module (101) and is used to detect the temperature at the tab.

6. The lithium battery system (10) according to claim 1, characterized in that: The control module (105) comprises: a second temperature detection terminal (1056); the second temperature detection module (103) comprises: a second thermistor (1031); One end of the second thermistor (1031) is electrically connected to the second temperature detection end (1056), and the other end of the second thermistor (1031) is electrically connected to the positive electrode of the battery cell module (101).

7. The lithium battery system (10) according to claim 1, characterized in that: The control module (105) comprises: a discharge control terminal (1057) and a charge control terminal (1058); the switch module (106) comprises: a first transistor (1061) and a second transistor (1062); The first electrode of the first transistor (1061) is electrically connected to the first electrode of the second transistor (1062), the second electrode of the first transistor (1061) is electrically connected to the negative electrode of the battery cell module (101), and the control electrode of the first transistor (1061) is electrically connected to the discharge control terminal (1057); The control electrode of the second transistor (1062) is electrically connected to the charging control terminal (1058).

8. The lithium battery system (10) according to claim 7, characterized in that: The first transistor (1061) is an N-channel field effect transistor; the control electrode of the first transistor (1061) is the gate of the N-channel field effect transistor; the first electrode of the first transistor (1061) is the drain of the N-channel field effect transistor; and the second electrode of the first transistor (1061) is the source of the N-channel field effect transistor.

9. The lithium battery system (10) according to claim 7, characterized in that: The second transistor (1062) is an N-channel field effect transistor; the control electrode of the second transistor (1062) is the gate of the N-channel field effect transistor; the first electrode of the second transistor (1062) is the drain of the N-channel field effect transistor; and the second electrode of the second transistor (1062) is the source of the N-channel field effect transistor.

10. The lithium battery system (10) according to claim 7, characterized in that: The second temperature detection module (103) comprises: a second thermistor (1031); a distance between the second thermistor (1031) and the first transistor (1061) is smaller than a preset distance threshold, and / or a distance between the second thermistor (1031) and the second transistor (1062) is smaller than the preset distance threshold.

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