CN115810812A - Battery, battery state detection method and related device - Google Patents
Battery, battery state detection method and related device Download PDFInfo
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- CN115810812A CN115810812A CN202211418188.2A CN202211418188A CN115810812A CN 115810812 A CN115810812 A CN 115810812A CN 202211418188 A CN202211418188 A CN 202211418188A CN 115810812 A CN115810812 A CN 115810812A
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Abstract
The application provides a battery, a battery state detection method and a related device, which can be applied to the technical field of batteries. The battery comprises a battery management system BMS and a current detection device, wherein the current detection device is provided with at least two different sampling gears and is used for collecting the current value of the bus; the BMS is connected with the current detection device; the BMS is used for receiving a first bus current value from the current detection device; controlling a current detection device to acquire a bus current value based on a target sampling gear based on a first bus current value; and determining the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the corresponding relation between the predefined multiple intervals and the multiple states of the battery. Based on the scheme, the state of the battery is detected through the circuit in the battery, dependence on an external load circuit is eliminated, and the limitation on the use range and the scene of battery state detection is reduced.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a battery, a battery state detection method, and a related device.
Background
Many electrically powered devices currently use batteries as a source of electrical energy, some of which are replaceable. Such a battery may be in a state where the battery is in place or in a state where the battery is not in place. If the battery judges the state of the battery by mistake, the battery may be kept in a sleep mode in the in-place state, so that the normal operation of the electric equipment is influenced; or may remain in an operational mode in a state where the battery is not in place, thereby easily causing electric sparks due to excessive instantaneous current when the battery is inserted into the load port, thereby causing a safety hazard to the entire apparatus.
The current battery state detection needs to connect a part of loops in the battery with a part of circuits of a load to form a detection loop, send an in-place detection signal through the detection loop, and judge the state of the battery according to the in-place detection signal. However, this method of detecting the battery state requires a detection circuit to be provided in both the battery and the load, and if the detection circuit is not provided in the load, the battery state cannot be detected, which limits the range of use.
Accordingly, it is desirable to provide a solution that can achieve battery state detection without relying on an external load circuit in the presence of a battery state detection requirement.
Disclosure of Invention
The application provides a battery, a battery state detection method and a related device, so that the effect of battery state detection is achieved without depending on an external load circuit.
In a first aspect, the present application provides a battery comprising: the system comprises a Battery Management System (BMS) and a current detection device, wherein the current detection device is provided with at least two different sampling gears and is used for collecting the value of a bus current flowing through a bus based on one of the at least two different sampling gears; the BMS is connected with the current detection device; the BMS is used for receiving a first bus current value from the current detection device; controlling a current detection device to acquire a bus current value based on a target sampling gear based on a first bus current value, wherein the target sampling gear belongs to at least two different sampling gears; and determining the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the corresponding relation between the predefined multiple intervals and the multiple states of the battery.
In the scheme provided by the application, the bus current value is acquired through the current detection device, and the state of the battery is further judged based on the bus current value and the corresponding relation between the predefined multiple intervals and the multiple states of the battery. The battery state is detected through the circuit in the battery, dependence on an external load circuit is eliminated, and the limitation on the use range and the scene of battery state detection is reduced.
With reference to the first aspect, in some possible implementations of the first aspect, each of the at least two different sampling positions corresponds to a sampling precision, and/or each of the at least two different sampling positions corresponds to a preset output current capability, where the preset output current capability represents a capability of outputting a current within a preset size range.
The current detection device has the functions of a plurality of sampling gears and can have two aspects, on one hand, the current detection device can detect current under different sampling precision, and the adaptability of the current detection device to different current sizes is improved; on the other hand, the different preset output current capacities can keep the output current in different preset size ranges as much as possible, so that the output current can be prevented from being instantly increased, the generation of electric sparks is avoided, and the risk of potential safety hazards is further reduced; and can prevent when the electric equipment needs heavy current, the output current of battery is too little, influences the normal operating of electric equipment.
With reference to the first aspect, in some possible implementations of the first aspect, the at least two different sampling gears include a first sampling gear and a second sampling gear; when the first bus current value is larger than a preset threshold, the target sampling gear is a first sampling gear; or when the first bus current value is smaller than or equal to the preset threshold, the target sampling gear is the second sampling gear.
With reference to the first aspect, in some possible implementations of the first aspect, the current detection device includes: the current sampling circuit comprises a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module, wherein the resistance value of the second resistor is greater than that of the first resistor, the first switch is connected with the first resistor in series, the first switch is connected with the second resistor in parallel, the first switch is used for controlling current to be switched between the first resistor and the second resistor, the first current sampling module is used for detecting a first current value flowing through the first resistor, and the second current sampling module is used for detecting a second current value flowing through the second resistor; the current detection device is set to be in a closed state when sampling is carried out on the first sampling gear, and the current value of the first bus is a first current value; the current detection device is set to be in an off state when the second sampling gear is used for sampling, and the first bus current value is the second current value.
The two resistors with different resistance values are adopted in the current detection device, the bus current value can be detected by using the resistor with the smaller resistance value when the current value is larger, and the bus current value can be detected by using the resistor with the larger resistance value when the current value is smaller, so that the measurement precision of the detection current can be improved.
With reference to the first aspect, in some possible implementation manners of the first aspect, the BMS is specifically configured to, when being configured to control the current detection device to acquire the bus current value based on the target sampling shift position based on the first bus current value: when the first bus current value is smaller than or equal to the preset threshold, controlling the first switch to be switched off so that current flows through the second resistor; or when the first bus current value is larger than the preset threshold, controlling the first switch to be closed so that the current flows through the first resistor.
With reference to the first aspect, in some possible implementation manners of the first aspect, the second resistor is configured to implement an output current slow start capability when the first bus current value is less than or equal to a preset threshold, where the output current slow start capability indicates a capability of reducing a change rate of the output current.
The ability of output current slow start can reduce the risk that too big instantaneous current arouses the electric spark, improves the security of battery.
With reference to the first aspect, in some possible implementations of the first aspect, the second current sampling module includes a differential amplifier, and the differential amplifier is connected in parallel to two ends of the second resistor, or connected in parallel to two ends of the first resistor and the second resistor.
The differential amplifier can be used for measuring the voltage difference between two ends of the resistor, the amplification factor can be switched, the amplification factor is switched to be larger under the condition of smaller current, and the accuracy of current sampling under the condition of small current can be improved.
With reference to the first aspect, in some possible implementations of the first aspect, the second current sampling module includes a first measurement device for measuring a bus voltage value and a second measurement device for outputting a voltage value; the second current sampling module is specifically used for determining a second current value according to the bus voltage value measured by the first measuring device, the output voltage value measured by the second measuring device and the resistance value of the second resistor.
If the second current value is not convenient to directly measure, the second current value can be obtained through indirect calculation after the bus voltage value and the output voltage value are measured.
With reference to the first aspect, in some possible implementation manners of the first aspect, the battery further includes: a second switch connected in series with the second resistor; the current detection device is set to be in an off state when sampling is carried out in the first sampling gear; the current detection device is set to be in a closed state when sampling is carried out in the second sampling gear.
With reference to the first aspect, in some possible implementation manners of the first aspect, the current detection device includes a first resistor and a first current sampling module, where the first resistor is located on a bus, a current value of the bus is a first current value flowing through the first resistor, and the first current sampling module is configured to detect the first current value.
And the second resistor is added, so that the measurement precision in small current detection is improved. Under the condition that the requirement on the measurement precision is not high, the bus current value can be detected only through the first resistor and the first current sampling module without adding the second resistor.
With reference to the first aspect, in some possible implementation manners of the first aspect, the first current sampling module includes a differential amplifier, and the differential amplifier is connected in parallel to two ends of the first resistor.
The differential amplifier can switch sampling gear by changing the gain factor of amplification, and change sampling precision.
In a second aspect, the present application provides a battery state detection method, applied to a battery, the battery including: the system comprises a BMS and a current detection device, wherein the current detection device is provided with at least two different sampling gears and is used for collecting the value of a bus current flowing through a bus based on one sampling gear of the at least two different sampling gears, and the BMS is connected with the current detection device; the method comprises the following steps: receiving a first bus current value from a current detection device; controlling a current detection device to acquire a bus current value based on a target sampling gear based on a first bus current value, wherein the target sampling gear belongs to at least two different sampling gears; determining the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the corresponding relation between the predefined multiple intervals and the multiple states of the battery
In the scheme provided by the application, the bus current value is detected through the current detection device, and the state of the battery is further judged based on the bus current value. The battery state is detected through the circuit in the battery, dependence on an external load circuit is eliminated, and the limitation on the use range and the scene of battery state detection is reduced.
With reference to the second aspect, in some possible implementations of the second aspect, each of the at least two different sampling positions corresponds to a sampling precision, and/or each of the at least two different sampling positions corresponds to a preset output current capability, where the preset output current capability represents a capability of outputting a current within a preset size range.
The function that the current detection device has a plurality of sampling gears can comprise two aspects, on one hand, the current detection device can detect current under different sampling precision, and the adaptability of the current detection device to different current sizes is improved; on the other hand, the different preset output current capacities can keep the output current in different preset size ranges as much as possible, so that the output current can be prevented from being instantly increased, the generation of electric sparks is avoided, and the risk of potential safety hazards is further reduced; and can prevent when the electric equipment needs heavy current, the output current of battery is too little, influences the normal operating of electric equipment.
With reference to the second aspect, in some possible implementations of the second aspect, the at least two different sampling gears include a first sampling gear and a second sampling gear; when the first bus current value is larger than a preset threshold, the target sampling gear is a first sampling gear; or when the first bus current value is smaller than or equal to the preset threshold, the target sampling gear is the second sampling gear.
With reference to the second aspect, in some possible implementations of the second aspect, the current detection device includes: the current sampling circuit comprises a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module, wherein the resistance value of the second resistor is greater than that of the first resistor, the first switch is connected with the first resistor in series, the first switch is connected with the second resistor in parallel, the first switch is used for controlling current to be switched between the first resistor and the second resistor, the first current sampling module is used for detecting a first current value flowing through the first resistor, and the second current sampling module is used for detecting a second current value flowing through the second resistor; the current detection device is set to be in a closed state when sampling is carried out on the first sampling gear, and the current value of the first bus is a first current value; the current detection device is set to be in an off state when sampling is carried out on the second sampling gear, and the first bus current value is the second current value.
The two resistors with different resistance values are adopted in the current detection device, the resistor with the smaller resistance value can be used for detecting the bus current value when the current value is larger, and the resistor with the larger resistance value is used for detecting the bus current value when the current value is smaller, so that the measurement accuracy of the detection current can be improved.
With reference to the second aspect, in some possible implementation manners of the second aspect, based on the first bus current value, the controlling the current detecting device to acquire the bus current value based on the target sampling shift position includes: when the first bus current value is smaller than or equal to the preset threshold, controlling the first switch to be switched off so that current flows through the second resistor; or when the first bus current value is larger than the preset threshold, controlling the first switch to be closed so that the current flows through the first resistor.
With reference to the second aspect, in some possible implementation manners of the second aspect, the second resistor is configured to implement an output current slow start capability when the first bus current value is less than or equal to the preset threshold, where the output current slow start capability represents a capability of reducing a change rate of the output current.
The ability of output current slow start can reduce the risk that too big instantaneous current arouses the electric spark, improves the security of battery.
With reference to the second aspect, in some possible implementations of the second aspect, the second current sampling module includes a differential amplifier, and the differential amplifier is connected in parallel across the second resistor, or connected in parallel across the first resistor and the second resistor.
The differential amplifier can be used for measuring the voltage difference between two ends of the resistor, the amplification factor can be switched, the amplification factor is switched to be larger under the condition of smaller current, and the accuracy of current sampling under the condition of small current can be improved.
With reference to the second aspect, in some possible implementations of the second aspect, the second current sampling module further includes a first measurement device for measuring a bus voltage value and a second measurement device for measuring an output voltage value; the method further comprises the following steps: and determining a second current value according to the bus voltage value measured by the first measuring device, the output voltage value measured by the second measuring device and the resistance value of the second resistor.
If the second current value is not convenient to directly measure, the second current value can be obtained by indirectly calculating after the bus voltage value and the output voltage value are measured.
With reference to the second aspect, in some possible implementations of the second aspect, the battery further includes: a second switch; the second switch is connected in series with the second resistor; the current detection device is set to be in an off state when the first sampling gear is used for sampling; the current detection device is set to be in a closed state when sampling is carried out in the second sampling gear.
With reference to the second aspect, in some possible implementation manners of the second aspect, the current detection device includes a first resistor and a first current sampling module, where the first resistor is located on the bus, the first current value is a first current value flowing through the first resistor, the first bus current value is a first current value, and the first current sampling module is configured to detect the first current value.
And the second resistor is added, so that the measurement precision in small current detection is improved. Under the condition of low measurement precision, the bus current value can be detected only by the first resistor and the first current sampling module without adding the second resistor.
With reference to the second aspect, in some possible implementations of the second aspect, the first current sampling module includes a differential amplifier, and the differential amplifier is connected across the first resistor in parallel.
The differential amplifier can switch sampling gear by changing the gain factor of amplification, and change sampling precision.
In a third aspect, the present application provides an electric device, including the battery in any one of the possible implementations of the first aspect and the first aspect, and an electric device connected to the battery, where the battery is configured to provide electric energy to the electric device.
In a fourth aspect, the present application provides a computer-readable storage medium comprising a computer program which, when run on a computer, causes the method of any one of the possible implementations of the second aspect and the second aspect described above to be implemented.
In a fifth aspect, the present application provides a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes the method of any one of the second aspect and possible implementations of the second aspect to be implemented.
It should be understood that the technical solutions of the third aspect to the fifth aspect correspond to the first aspect and the second aspect, and the advantageous effects obtained by the aspects and the corresponding possible embodiments are similar and will not be described again.
Drawings
FIG. 1 is a schematic diagram of a usage scenario of a battery suitable for use in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application;
FIG. 3 is a schematic flow chart of a battery status detection method provided herein;
fig. 4 is a schematic structural diagram of a battery provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a battery provided by an embodiment of the present application, which includes a second current sampling module;
fig. 6 is a schematic structural diagram of a battery provided by an embodiment of the present application, including a second switch;
FIG. 7 is a schematic diagram showing the level change of the first switch and the second switch when the bus current value increases;
FIG. 8 is a schematic diagram illustrating the level variation of the first switch and the second switch when the bus current value decreases;
FIG. 9 is a schematic diagram of another structure of a battery provided in an embodiment of the present application;
fig. 10 is a schematic block diagram of a battery state detection apparatus provided in an embodiment of the present application;
fig. 11 is another schematic block diagram of a battery state detection apparatus provided in an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a usage scenario applicable to a battery provided in an embodiment of the present application.
Many electrically powered devices currently use batteries as a source of electrical energy, some of which are replaceable. The state of the battery may be in place, such as providing power to the electrically powered device in an electrically powered device, or charging in a charging device; it may also be off-site, i.e. neither in the electrically powered device nor in the charging device. The battery can be in different modes in different states, for example, the battery can be in a working mode when working in the electric device and when charging in the charging device, the battery can be in a primary sleep mode when not in place, the battery is in a secondary sleep mode when in place but the device is not turned on, and the battery is in a tertiary sleep mode when in place but the device is turned on but does not start working.
If the battery mode is not consistent with the state of the battery, for example, the battery is in a sleep mode when in an electric device, the normal operation of the electric device may be influenced; when the battery is not in place, the battery is in a working mode, and excessive instantaneous current can be generated when the battery is connected with a load to cause electric sparks, so that potential safety hazards are brought to the whole equipment.
The electric equipment may be, for example, an electric motorcycle as shown in fig. 1, or may be other equipment using electric energy as a power source, for example, but not limited to, a new energy vehicle, an electric bicycle, an electric scooter, an electric ship, an electric airplane, an electric aerocar, an electric lawn mower, electric construction equipment, an electric train, a golf cart, an electric train, and the like.
The electric equipment comprises electric equipment connected with a battery, and the battery can be used for supplying electric energy to the electric equipment. The electric device may be, for example, a motor, a lamp, or the like, which is not limited in the present application.
The current battery state detection needs to connect a part of loops in the battery with a part of circuits of the load to form a detection loop, and send an in-place detection signal through the detection loop. If the on-position detection signal can be received, the state of the battery is judged to be on position; if the on-position detection signal is not received, the state of the battery is judged to be off-position. However, this method of detecting the battery state requires a detection circuit to be provided in both the battery and the load, and if the detection circuit is not provided in the load, the battery state cannot be detected, which limits the range of use.
In view of this, the present application provides a solution, in which a circuit inside a battery is used to detect a state of the battery, and the state of the battery is determined based on a detected bus current value and a predefined correspondence relationship between multiple intervals of the bus current value and multiple states of the battery, so that the detection of the battery state can be implemented without depending on a circuit of an external load.
Fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application. As shown in fig. 2, the battery includes: battery core, battery management system BMS and current detection device.
The current detection device can be used for detecting the current value of the bus; the battery cell is used for storing electric energy; the BMS is connected with the current detection device through an electric signal, and the BMS can obtain the bus current value from the current detection device.
The battery also comprises a bus (bus), and the voltage value of the bus can be V bus To indicate that the output voltage value of the battery can be V out To indicate.
Based on the structure of the battery provided in fig. 2, the present application provides a battery state detection method, and fig. 3 is a schematic flowchart of the battery state detection method provided in the present application, which can be executed by a BMS. The battery state detection method will be described in detail below with reference to fig. 3.
In step 310, a first bus bar current value is received from a current detection device. The first bus current value refers to a bus current value used to determine whether the sampling shift position needs to be switched.
In the structure of the battery provided in fig. 2, the current detection device obtains the bus current value, which may be measuring the voltage V at two ends of a resistor with a known resistance value R on one bus, and further calculating the bus current value I = V ÷ R; or the current value of the bus can be directly detected by connecting the bus in series. The present application does not limit the manner of detecting the bus current value.
There is an electrical signal connection between the BMS and the current sensing device, so the current sensing device can transmit the sensed bus current value to the BMS.
In step 320, based on the first bus current value, the current detection device is controlled to acquire a bus current value based on the target sampling gear.
The bus bar current value may be detected based on the structure of the battery as shown in fig. 2, and the state of the battery may be determined based on the bus bar current value. However, in the configuration shown in fig. 2, if only one sampling shift is included in the current detection device for detecting the current, the detected division value may be limited, and the measurement accuracy of the current value may not be high. Therefore, more sampling gears can be added into the current detection device to improve the measurement accuracy.
In some cases, when the battery is changed from the non-existing state to the existing state, an excessive instantaneous current may be generated, and further, an electric spark may be generated, thereby causing a safety hazard to the battery and the electric equipment. Different sampling gears can correspond to different preset output current capabilities, the different preset output current capabilities can enable the output current to be kept in different preset size ranges as much as possible, the output current can be prevented from being instantly increased, electric sparks are avoided, and the risk of potential safety hazards is further reduced; and can prevent when the electric equipment needs heavy current, the output current of battery is too little, influences the normal operating of electric equipment.
In step 330, the current state of the battery is determined based on the second bus current value collected by the current detection device in the target sampling gear and the corresponding relationship between the predefined multiple intervals and the multiple states of the battery. The second bus current value refers to a bus current value used to determine the battery state.
After the current detection device detects the bus current value, the BMS may acquire the bus current value from the current detection device, and then the BMS determines the state of the battery based on the bus current value and correspondence between a plurality of predefined intervals and a plurality of states of the battery.
For an example, for a part of electric motorcycles, the interval of the predefined bus current value is in the range of 0-1 milliampere, and the battery is not in place; the bus current value interval is within the range of 1-30 milliamperes, the battery state is that the battery is in place and the vehicle operation lock is closed; the bus current value interval is in the range of 30-300 milliamperes, the battery state is that the battery is in place and the vehicle operation lock is unlocked; the bus current value interval is in a range larger than 300 milliamperes, and the battery is in a state that the battery is in place and the vehicle runs or the battery is charged.
Fig. 4 is a schematic structural diagram of a battery provided in an embodiment of the present application. As shown in fig. 4, the battery includes: battery cell, BMS and current detection device. The current sensing device shown in fig. 4 has at least two sampling positions. Illustratively, the current detection device comprises a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module.
The first switch is connected with the first resistor in series; the first resistor and the second resistor are two resistors with known resistance values, and the resistance value R of the second resistor 2 Greater than the resistance R of the first resistor 1 Generally, the resistance R of the second resistor 2 Can be far larger than the resistance R of the first resistor 1 For example, the resistance value R of the second resistor 2 Is the resistance value R of the first resistor 1 More than ten times; the first current sampling module can be used for detecting a first current value flowing through the first resistor, and the second current sampling module can be used for detecting a second current value flowing through the second resistor; the second resistor may be connected in parallel with the first switch; an electric signal connection also exists between the BMS and the first switch, and the BMS can control and sense whether the first switch is in an open state or a closed state.
It should be understood that the second resistor is connected in parallel with the first switch, and may be, as shown in fig. 4 (a), connected in parallel with the first switch and then connected in series with the first resistor, that is, the second resistor is connected in parallel with two ends of the first switch; as shown in fig. 4 (b), the first switch may be connected in series with the first resistor and then connected in parallel with the second resistor, that is, the second resistor is connected in parallel between the first resistor and the two ends of the first switch. This is not a limitation of the present application.
In the battery structure shown in fig. 4 (a), since the first switch is connected in parallel with the second resistor, the second resistor can be short-circuited after the first switch is closed, and it can be considered that the bus current no longer passes through the second resistor, that is, the bus current value is equivalent to short-circuiting the second resistor.
In the battery structure shown in fig. 4 (b), since the whole of the first switch and the first resistor is connected in parallel with the second resistor, and the resistance value of the first resistor is much smaller than that of the second resistor, after the first switch is closed, it can be considered that the bus current no longer passes through the second resistor, which is equivalent to short-circuiting the second resistor, and at this time, the bus current value is the first current value.
In the battery structure shown in fig. 4 (a) and (b), if the first switch is turned off, the bus current may pass through the second resistor, and at this time, the bus current value is the second current value.
The second current value may be measured by a second current sampling module.
One possible form of the second current sampling module is shown in fig. 4, and the second current sampling module may include a device for measuring the bus voltage value V bus And the output voltage value V out The second measuring device of (1). In the battery structure shown in fig. 4 (a), V is turned off when the first switch is turned off bus ＝V 1 +V 2 +V out Then V is 2 ＝V bus -V 1 -V out Wherein the first voltage value V is between the two ends of the first resistor because the resistance of the first resistor is small relative to the resistance of the second resistor 1 Can be ignored, so can be approximately regarded as V 2 ＝V bus -V out . In the battery structure shown in fig. 4 (b), V is set to be in a state where the first switch is turned off bus ＝V 2 +V out Then V is 2 ＝V bus -V out . Thus, V can be measured by the first measuring device bus And V measured by the second measuring device out Calculating to obtain the voltage value V at two ends of the second resistor 2 。
Another possible form of the second current sampling module is shown in fig. 5. In the battery structure as shown in (a) of fig. 5, the second current sampling module is connected in parallel across the second resistor, and the second current sampling module can detect the second resistorVoltage value V between two ends of two resistors 2 . In the battery structure as shown in (b) of fig. 5, the second current sampling module is connected in parallel to both ends of the first resistor and the second resistor, and the sum V of the voltage value across the first resistor and the voltage value across the second resistor can be detected 1 +V 2 Wherein the first voltage value V is between the two ends of the first resistor because the resistance of the first resistor is small relative to the resistance of the second resistor 1 Can be ignored, so the voltage value V of the two ends of the second resistor can be approximately considered to be detected 2 。
In the battery structure shown in fig. 5, the second current sampling module may be an electronic device such as a voltmeter or a differential amplifier, which is not limited in the present application. The differential amplifier can be used for measuring the voltage difference between two ends of the resistor, and can adjust the amplification factor, adjust to a smaller amplification factor under the condition of larger current, adjust to a larger amplification factor under the condition of smaller current, and flexibly adjust the current sampling precision according to the use requirement.
Obtaining the voltage value V at two ends of the second resistor through the two second current sampling modules 2 Then, since the resistance value of the second resistor is known as R 2 Then the second current value is obtained as I 2 ＝V 2 ÷R 2 。
It should be understood that, in addition to the second current sampling module shown in fig. 4 and 5, the second current sampling module may be connected in series with the second resistor to directly detect the second current value. The present application does not limit the manner of detecting the second current value.
The current detection device is added with the second resistor with larger resistance compared with the first resistor, so that the sampling precision during the detection of small current can be improved.
In an example, the resistance value of the first resistor is 1 ohm, the precision of the voltage detected by the first current sampling module can reach 1 volt, and the precision of the current sampled by the first current sampling module is 1 ampere; the resistance value of the second resistor is 100 ohms, and the accuracy of the current sampled by the second current sampling module is 0.01 ampere under the condition that the accuracy of the voltage detected by the second current sampling module can also reach 1 volt.
And when the battery is in the sleep mode, the bus current passes through the second resistor, and the resistance value of the second resistor is larger, so that the internal resistance of the whole battery can be increased by the second resistor. When the battery is in the working mode, the bus current passes through the first resistor with smaller resistance, and the resistance of the first resistor is smaller, so that the battery has relatively smaller influence on the operation of the electric equipment even if the current value passing through the first resistor is larger.
In the battery shown in fig. 4 or 5, in the case where the bus bar current value is large, the bus bar current value may be detected using the first resistor, and at this time, the bus bar current value is the first current value flowing through the first resistor; when the bus current value is small, the bus current value can be detected by using the second resistor, and the bus current value is the second current value flowing through the second resistor. Accordingly, a threshold for switching between the first resistance and the second resistance, referred to herein as a preset threshold, may be set. When the bus current value is greater than the preset threshold, the target sampling gear is a first sampling gear, the BMS can control the first switch to be closed, the bus current value is a first current value and can be detected by the first current sampling module, and then the BMS can judge the state of the battery based on the first current value; when the bus current value is smaller than or equal to the preset threshold, the target sampling gear is a second sampling gear, the BMS can control the first switch to be switched off, the bus current value is a second current value, the second current sampling module can be used for detecting, and then the BMS can judge the state of the battery based on the second current value.
For convenience of distinction and explanation, a bus current value for determining whether the sampling gear needs to be switched is referred to as a first bus current value, and a bus current value for determining the battery state is referred to as a second bus current value. In other words, when the first bus current value is greater than the preset threshold, the first sampling gear is used for collecting the bus current value, that is, the first sampling gear is used as the target sampling gear; and when the first bus current value is smaller than or equal to the preset threshold, acquiring the bus current value by using the second sampling gear, namely, taking the second sampling gear as a target sampling gear.
And the bus current value acquired based on the target sampling gear is a second bus current value. It will thus be appreciated that the bus current values used in determining the battery state from the bus current values described herein are all second bus current values.
It should be understood that the first bus bar current value and the second bus bar current value are defined only for the sake of distinguishing different functions, and should not constitute any limitation to the present application. The first bus current value and the second bus current value may be the same, for example, if it is determined that the shift does not need to be switched according to the first bus current value, the first bus current value and the second bus current value are the same; the first bus current value and the second bus current value may also be different, for example, if it is determined that the shift needs to be switched according to the first bus current value, the first bus current value and the second bus current value may be different, and the second bus current value may be more accurate than the first bus current value.
Under different working conditions, the bus current values are different, the states of the bus current values may be different, and the modes of the battery may be different. In the following, the preset threshold is 300 ma as an example.
When the battery is taken out, the bus current value of the battery is smaller than 300 milliamperes, at the moment, the first switch is in an off state, the target sampling gear is a second sampling gear, the bus current value is a second current value, and the BMS acquires the second current value from the second current sampling module. The second current value is, for example, 0.5 ma, and is within a predefined interval of 0 to 1 ma, then the state of the battery is an off-bit state at this time, and the mode is a primary sleep mode.
When the battery is installed on the electric motorcycle, the electric motorcycle is not started, the instrument and the vehicle-mounted system of the electric motorcycle are in a shutdown state, the bus current value of the battery is smaller than 300 milliamperes, the first switch is in a disconnection state at the moment, the target sampling gear is a second sampling gear, the bus current value is a second current value, and the BMS acquires the second current value from the second current sampling module. The second current value is 20 milliamperes, for example, and is within a predefined interval of 1-30 milliamperes, then the state of the battery is in-place at this moment, and the mode is a secondary sleep mode.
When the electric motorcycle does not run, the instrument and the vehicle-mounted system of the electric motorcycle are in a power-on state, the bus current value of the battery is less than 300 milliamperes, at the moment, the first switch is in a power-off state, the target sampling gear is a second sampling gear, the bus current value is a second current value, and the BMS acquires the second current value from the second current sampling module. The second current value is, for example, 200 ma, and is within a predefined interval of 30 to 300 ma, then the state of the battery is in the on state at this time, and the mode is a three-stage sleep mode.
When the electric motorcycle is in a driving process or the battery is being charged, the bus current value of the battery is greater than 300 milliamperes, at this time, the BMS may control the first switch to be closed, the target sampling gear is a first sampling gear, the bus current value is a first current value, the BMS acquires the first current value from the first current sampling module, the first current value is, for example, 1 ampere, within a predefined interval greater than 300 milliamperes, the state of the battery is in-place at this time, and the mode of the battery is the working mode.
As can be seen from the above example, when the bus current of the battery is greater than the preset threshold, the battery is in the operating mode; when the bus current of the battery is less than or equal to a preset threshold, the battery is in a sleep mode.
Alternatively, as shown in fig. 6, a second switch may be further included in the battery, and the second switch is connected in series with the second resistor.
As shown in fig. 6 (a), the second switch and the second resistor may be connected in series, and then connected in parallel with the first switch, and the second switch, the second resistor, and the first switch as a whole are connected in series with the first resistor; as shown in fig. 6 (b), the second switch may be connected in series with the second resistor, the first switch may be connected in series with the first resistor, the second switch and the second resistor may serve as a branch, the first switch and the first resistor may also serve as a branch, and the two branches may be connected in parallel. This is not a limitation of the present application.
In the battery as shown in fig. 6, when the bus current value is greater than the preset threshold, the BMS may control not only the first switch to be closed but also the second switch to be opened so that the current flows through the first resistor; when the bus current value is less than or equal to the preset threshold, the BMS may control not only the first switch to be turned off but also the second switch to be turned on, so that current flows through the second resistor.
Due to the fact that continuity of the current of the battery bus needs to be guaranteed, the first switch and the second switch can be controlled to be opened or closed in sequence. Illustratively, when the bus current value is greater than a preset threshold, the BMS controls the first switch to be closed no later than the second switch to be opened; when the bus current value is smaller than or equal to the preset threshold, the BMS controls the second switch to be closed no later than the first switch to be opened.
When the bus current value increases, the level change of the first switch and the second switch is as shown in fig. 7. Bus current value at t 1 The moment rises to be larger than a preset threshold, and the first switch is at t 2 Is closed at time t, the second switch is at 3 At a time t is turned off 1 ≤t 2 ≤t 3 。
Fig. 8 shows the level changes of the first switch and the second switch when the bus current value decreases. Bus current value at t 4 The moment is reduced to be less than a preset threshold, and the second switch is at t 5 Is closed at time t, the first switch is at 6 At a time t is turned off 4 ≤t 5 ≤t 6 。
In the scheme provided by the application, the bus current value is detected through the current detection device, and the state of the battery is further judged based on the bus current value. The battery state is detected through the circuit in the battery, dependence on an external load circuit is eliminated, and the limitation on the use range and the scene of battery state detection is reduced. In addition, still can further confirm the mode of battery based on above-mentioned scheme, be favorable to with the power output of battery and electric equipment phase-match, improve the security of battery, reduce the influence of battery to electric equipment.
In some cases, the requirement for the detection accuracy of the current is not high, and the current detection device may include the first resistor instead of the second resistor. Fig. 9 is a schematic structural diagram of another battery provided in the embodiment of the present application. As shown in fig. 9, the battery includes: battery core, battery management system BMS and current detection device.
The current detection device comprises a first current sampling module and a first resistor, and can be used for detecting the current value of the bus; the battery cell is used for storing electric energy; the BMS is electrically connected with the first current sampling module, and can acquire a bus current value from the first current sampling module.
It should be understood that fig. 9 is a schematic structural diagram of the battery provided in the embodiment of the present application. As shown in fig. 9, the manner of detecting the bus current value by the first current sampling module may be that the first current sampling module is connected in parallel to two ends of the first resistor, detects the voltage at two ends of the first resistor, and calculates the bus current value by the voltage value and the resistance value; the first current sampling module can also be connected with the first resistor in series to directly detect the bus current value. The present application does not limit the manner of detecting the bus current value.
In the above case, the first current sampling module may be a differential amplifier, and the differential amplifier may switch sampling positions by changing a gain factor of amplification, so as to change sampling precision.
In the scheme provided by the application, the bus current value is detected through the current detection device, and the state of the battery is further judged based on the bus current value. The battery state is detected through the circuit in the battery, dependence on an external load circuit is eliminated, and the limitation on the use range and the scene of battery state detection is reduced.
Fig. 10 is a schematic block diagram of a battery status detecting apparatus provided in an embodiment of the present application, and as shown in fig. 10, the battery status detecting apparatus 1000 may include a receiving module 1010, a control module 1020, and a determining module 1030.
The device can be used to implement the battery or the BMS in the battery in the method embodiment shown in fig. 3.
The receiving module 1010 may be configured to receive a first bus current value from a current detecting device; the control module 1020 may be configured to control the current detection device to acquire a bus current value based on the target sampling gear based on the first bus current value; the determining module 1030 may be configured to determine the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the correspondence between the predefined multiple intervals and multiple states of the battery.
Optionally, the control module 1020 may be configured to, in a case that the bus current value is less than or equal to a preset threshold, control the first switch to be turned off, so that a current flows through the second resistor; or when the bus current value is larger than the preset threshold, controlling the first switch to be closed so that the current flows through the first resistor.
Optionally, the determining module 1030 is further configured to determine the second current value according to the bus voltage value measured by the first measuring device, the output voltage value measured by the second measuring device, and the resistance value of the second resistor.
It should be understood that the division of the modules in the embodiments of the present application is illustrative, and is only one logical function division, and there may be other division manners in actual implementation. In addition, functional modules in the embodiments of the present application may be integrated into one processor, may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
Fig. 11 is another schematic block diagram of a battery state detection apparatus provided in an embodiment of the present application. As shown in fig. 11, the apparatus 1100 may include at least one processor 1110, which may be used to implement the functions of the BMS in the above-described method embodiments. For details, reference is made to the detailed description in the method example, which is not repeated herein.
The apparatus 1100 may also include a memory 1120 for storing program instructions and/or data. The memory 1120 is coupled to the processor 1110. The coupling in this application is an indirect coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, and is used for information interaction between the devices, units or modules. The processor 1110 may operate in conjunction with the memory 1120. Processor 1110 may execute program instructions stored in memory 1120. At least one of the at least one memory may be included in the processor.
The apparatus 1100 may also include a communication interface 1130 for communicating with other devices over a transmission medium such that the apparatus used in the apparatus 1100 may communicate with other devices. The communication interface 1130 may be, for example, a transceiver, an interface, a bus, a circuit, or a device capable of performing a transceiving function. Processor 1110 may utilize communications interface 1130 to send and receive data and/or information and may be used to implement the battery status detection method described in the corresponding embodiment of fig. 3.
The specific connection media between processor 1110, memory 1120, and communication interface 1130 described above are not limiting in this application. In fig. 11, the processor 1110, the memory 1120, and the communication interface 1130 are connected by a bus 1140. The bus 1140 is shown in fig. 11 by a thick line, and the connection between other components is merely illustrative and not intended to be limiting. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but this is not intended to represent only one bus or type of bus.
In the embodiments of the present application, the processor may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, and may implement or perform the methods, steps, and logic blocks disclosed in the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.
According to the method provided by the present application, an electric device is also provided, which includes a battery as described in the embodiments corresponding to fig. 2, fig. 4, fig. 5, fig. 6 or fig. 9, and a power consumption device connected to the battery, and the battery is used for supplying electric energy to the power consumption device.
According to the method provided by the present application, there is also provided a computer-readable storage medium storing program code, which when run on a computer, causes the computer to execute the battery state detection method described in the embodiment corresponding to fig. 3.
In accordance with the methods provided herein, the present application also provides a computer program product comprising: computer program code. When the computer program code runs on a computer, the computer is caused to execute the battery status detection method described in the corresponding embodiment of fig. 3.
The solutions provided in the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the present application are generated, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire, such as coaxial cable, fiber optic, digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium such as a Digital Video Disc (DVD), or a semiconductor medium, among others.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (16)
1. A battery, comprising: the system comprises a battery management system BMS and a current detection device, wherein the current detection device is provided with at least two different sampling gears and is used for collecting a bus current value flowing through a bus based on one sampling gear of the at least two different sampling gears; the BMS is connected with the current detection device;
the BMS is used for:
receiving a first bus current value from the current detection device;
controlling the current detection device to acquire the bus current value based on a target sampling gear based on the first bus current value, wherein the target sampling gear belongs to the at least two different sampling gears;
and determining the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the corresponding relation between a plurality of predefined intervals and various states of the battery.
2. The battery according to claim 1, wherein each of the at least two different sampling gear positions corresponds to a sampling precision and/or wherein each of the at least two different sampling gear positions is configured to correspond to a predetermined output current capability representing an ability to output current over a predetermined range of magnitudes.
3. The battery of claim 2, wherein the at least two different sampling gears include a first sampling gear and a second sampling gear;
when the first bus current value is larger than the preset threshold, the target sampling gear is the first sampling gear; or
When the first bus current value is smaller than or equal to the preset threshold, the target sampling gear is the second sampling gear.
4. The battery according to claim 3, wherein the current detection means comprises: the current sampling circuit comprises a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module, wherein the resistance value of the second resistor is greater than that of the first resistor, the first switch is connected with the first resistor in series, the first switch is connected with the second resistor in parallel, the first switch is used for controlling current to be switched between the first resistor and the second resistor, the first current sampling module is used for detecting a first current value flowing through the first resistor, and the second current sampling module is used for detecting a second current value flowing through the second resistor;
the current detection device is set to be in a closed state when the first sampling gear is used for sampling, and the first bus current value is the first current value;
the current detection device is set to be in an off state when the second sampling gear is used for sampling, and the first bus current value is the second current value.
5. The battery according to claim 4, wherein the BMS, when being configured to control the current detection device to collect the bus current value based on the target sampling gear based on the first bus current value, is specifically configured to:
when the first bus current value is smaller than or equal to the preset threshold, controlling the first switch to be switched off so that current flows through the second resistor; or
When the first bus current value is larger than the preset threshold, the first switch is controlled to be closed, so that the current flows through the first resistor.
6. The battery of claim 4, wherein the second current sampling module comprises a differential amplifier connected in parallel across the second resistor, or across the first resistor and the second resistor.
7. The battery of claim 4, wherein the second current sampling module comprises a first measuring device for measuring a bus voltage value and a second measuring device for outputting a voltage value;
the second current sampling module is specifically configured to determine the second current value according to the bus voltage value measured by the first measuring device, the output voltage value measured by the second measuring device, and the resistance value of the second resistor.
8. The battery of any of claims 4-7, further comprising: a second switch connected in series with the second resistor;
the current detection device is set to be in an off state when the first sampling gear is used for sampling;
the current detection device is set to be in a closed state when the second sampling gear is used for sampling.
9. The battery of claim 8, wherein the first current sampling module comprises a differential amplifier connected in parallel across the first resistor.
10. A battery state detection method is applied to a battery, and the battery comprises: the system comprises a battery management system BMS and a current detection device, wherein the current detection device is provided with at least two different sampling gears and is used for collecting the value of a bus current flowing through a bus based on one sampling gear of the at least two different sampling gears, and the BMS is connected with the current detection device;
the method comprises the following steps:
receiving a first bus current value from the current detection device;
controlling the current detection device to acquire the bus current value based on a target sampling gear based on the first bus current value, wherein the target sampling gear belongs to the at least two different sampling gears;
and determining the current state of the battery based on the second bus current value acquired by the current detection device in the target sampling gear and the corresponding relation between a plurality of predefined intervals and various states of the battery.
11. The method according to claim 10, characterized in that each of said at least two different sampling gear positions corresponds to a sampling precision and/or each of said at least two different sampling gear positions is adapted to correspond to a preset output current capability representing the capability of outputting a current within a preset size range.
12. The method of claim 11, wherein the at least two different sampling gears include a first sampling gear and a second sampling gear;
when the first bus current value is larger than the preset threshold, the target sampling gear is the first sampling gear; or
When the first bus current value is smaller than or equal to the preset threshold, the target sampling gear is the second sampling gear.
13. The method of claim 12, wherein the current sensing device comprises: the current sampling circuit comprises a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module, wherein the resistance value of the second resistor is greater than that of the first resistor, the first switch is connected with the first resistor in series, the first switch is connected with the second resistor in parallel, the first switch is used for controlling current to be switched between the first resistor and the second resistor, the first current sampling module is used for detecting a first current value flowing through the first resistor, and the second current sampling module is used for detecting a second current value flowing through the second resistor;
the current detection device is set to be in a closed state when the first sampling gear is used for sampling, and the first bus current value is the first current value;
the current detection device is set to be in an off state when the second sampling gear is used for sampling, and the first bus current value is the second current value.
14. The method of claim 13, wherein controlling the current detection device to acquire the bus current value based on the target sampling gear based on the first bus current value comprises:
when the first bus current value is smaller than or equal to the preset threshold, controlling the first switch to be switched off so that current flows through the second resistor; or
When the first bus current value is larger than the preset threshold, the first switch is controlled to be closed, so that the current flows through the first resistor.
15. An electrically powered device comprising a battery as claimed in any one of claims 1 to 9, and a consumer connected to the battery, the battery being for supplying electrical energy to the consumer.
16. A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the method according to any one of claims 10 to 14.
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| CN115993478A (en) * | 2023-03-21 | 2023-04-21 | 海的电子科技(苏州)有限公司 | Current detection circuit, current detection method and electronic equipment |
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| CN115993478A (en) * | 2023-03-21 | 2023-04-21 | 海的电子科技(苏州)有限公司 | Current detection circuit, current detection method and electronic equipment |
| CN115993478B (en) * | 2023-03-21 | 2023-05-16 | 海的电子科技(苏州)有限公司 | Current detection circuit, current detection method and electronic equipment |
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