A battery, a battery state detection method, and related devices.

Abstract

This application provides a battery, a battery state detection method, and related apparatus, applicable to the field of battery technology. The battery includes a Battery Management System (BMS) and a current detection device. The current detection device has at least two different sampling levels and is used to collect bus current values. The BMS is connected to the current detection device. The BMS receives a first bus current value from the current detection device. Based on the first bus current value, the BMS controls the current detection device to collect bus current values ​​at a target sampling level. Based on the second bus current value collected by the current detection device at the target sampling level, and the predefined correspondence between multiple intervals and various battery states, the current state of the battery is determined. Based on this scheme, the battery state is detected through internal battery circuitry, eliminating reliance on external load circuitry and reducing limitations on the scope and scenarios of battery state detection.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery, a battery state detection method, and related devices. Background Technology

[0002] Many electric devices currently use batteries as their power source, and some of these batteries are replaceable. These batteries may be in a "battery in" state or a "battery out" state. If the battery misjudges its state, it may remain in sleep mode when in the "battery in" state, affecting the normal operation of the electric device; or it may remain in operating mode when out of the "battery in" state, which could easily cause electrical sparks due to excessive instantaneous current when the battery is plugged into the load port, thus posing a safety hazard to the entire device.

[0003] Current battery status detection methods require connecting a portion of the battery's circuitry with a portion of the load's circuitry to form a detection loop. This loop then sends an in-situ detection signal, which is used to determine the battery's status. However, this method necessitates detection loops in both the battery and the load. If no detection loop is present in the load, battery status cannot be detected, thus limiting its applicability.

[0004] Therefore, it is desirable to provide a solution that can detect battery status without relying on an external load circuit when there is a need for battery status detection. Summary of the Invention

[0005] This application provides a battery, a battery state detection method, and related devices, aiming to achieve the effect of battery state detection without relying on external load circuits.

[0006] In a first aspect, this application provides a battery, including: a battery management system (BMS) and a current detection device, the current detection device having at least two different sampling levels, the current detection device being used to acquire a bus current value flowing through a bus based on one of the at least two different sampling levels; the BMS being connected to the current detection device; the BMS being used to receive a first bus current value from the current detection device; based on the first bus current value, controlling the current detection device to acquire a bus current value based on a target sampling level, the target sampling level belonging to at least two different sampling levels; and determining the current state of the battery based on a second bus current value acquired by the current detection device at the target sampling level, and the correspondence between predefined multiple intervals and multiple states of the battery.

[0007] The solution provided in this application collects the bus current value through a current detection device, and further determines the battery status based on the bus current value and the correspondence between multiple predefined intervals and various battery states. By detecting the battery status through internal battery circuitry, the reliance on external load circuitry is eliminated, reducing limitations on the scope and scenarios for battery status detection.

[0008] In conjunction with the first aspect, in some possible implementations of the first aspect, each of at least two different sampling levels corresponds to a sampling precision, and / or, each of at least two different sampling levels corresponds to a preset output current capability, which represents the capability to output current within a preset size range.

[0009] The function of a current detection device with multiple sampling levels can be summarized in two aspects. First, the current detection device can detect current at different sampling accuracies, improving its adaptability to different current magnitudes. Second, different preset output current capabilities can keep the output current within different preset ranges, preventing sudden increases in output current, avoiding the generation of electrical sparks, and thus reducing the risk of safety hazards. Moreover, it can prevent the battery's output current from being too low when the electric equipment requires a large current, thus affecting the normal operation of the electric equipment.

[0010] In conjunction with the first aspect, in some possible implementations of the first aspect, at least two different sampling levels include a first sampling level and a second sampling level; when the first bus current value is greater than a preset threshold, the target sampling level is the first sampling level; or when the first bus current value is less than or equal to a preset threshold, the target sampling level is the second sampling level.

[0011] In conjunction with the first aspect, in some possible implementations of the first aspect, the current detection device includes: a first switch, a first resistor, a first current sampling module, a second resistor, and a second current sampling module. The resistance of the second resistor is greater than the resistance of the first resistor. The first switch is connected in series with the first resistor and in parallel with the second resistor. The first switch is used to control the current to switch between the first resistor and the second resistor. The first current sampling module is used to detect a first current value flowing through the first resistor, and the second current sampling module is used to detect a second current value flowing through the second resistor. The current detection device is configured such that when sampling at the first sampling position, the first switch is in a closed state, and the first bus current value is the first current value. When sampling at the second sampling position, the first switch is in an open state, and the first bus current value is the second current value.

[0012] By using two resistors with different resistance values ​​in the current detection device, the smaller resistance resistor can be used to detect the bus current value when the current value is large, and the larger resistance resistor can be used to detect the bus current value when the current value is small, thereby improving the measurement accuracy of the detected current.

[0013] In conjunction with the first aspect, in some possible implementations of the first aspect, when the BMS is used to control the current detection device to collect the bus current value based on the target sampling range based on the first bus current value, it is specifically used to: control the first switch to open when the first bus current value is less than or equal to a preset threshold, so that the current flows through the second resistor; or control the first switch to close when the first bus current value is greater than the preset threshold, so that the current flows through the first resistor.

[0014] In conjunction with the first aspect, in some possible implementations of the first aspect, the second resistor is used to achieve output current soft-start capability when the first bus current value is less than or equal to a preset threshold, the output current soft-start capability representing the ability to reduce the rate of change of the output current.

[0015] The ability to start with a soft-start output current can reduce the risk of electrical sparks caused by excessive instantaneous current, thus improving battery safety.

[0016] In conjunction with the first aspect, in some possible implementations of the first aspect, the second current sampling module includes a differential amplifier connected in parallel across the second resistor, or connected in parallel across the first resistor and the second resistor.

[0017] A differential amplifier can be used to measure the voltage difference across a resistor, and the amplification factor can be switched. When the current is small, switching to a larger amplification factor can improve the accuracy of current sampling under small current conditions.

[0018] In conjunction with the first aspect, in some possible implementations of the first aspect, the second current sampling module includes a first measuring device for measuring the bus voltage value and a second measuring device for outputting the voltage value; specifically, the second current sampling module is used to determine the second current value based on 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.

[0019] If the second current value is not convenient to measure directly, it can be indirectly calculated by measuring the bus voltage and output voltage.

[0020] In conjunction with the first aspect, in some possible implementations of the first aspect, the battery further includes: a second switch connected in series with a second resistor; the current detection device is configured such that the second switch is in an open state when sampling at the first sampling level; and the current detection device is configured such that the second switch is in a closed state when sampling at the second sampling level.

[0021] In conjunction with the first aspect, in some possible implementations of the first aspect, the current detection device includes a first resistor and a first current sampling module, the first resistor is located on a bus, the first bus current value is a first current value flowing through the first resistor, and the first current sampling module is used to detect the first current value.

[0022] Adding a second resistor helps improve measurement accuracy when detecting small currents. If high measurement accuracy is not required, the second resistor can be omitted, and the bus current value can be detected using only the first resistor and the first current sampling module.

[0023] In conjunction with the first aspect, in some possible implementations of the first aspect, the first current sampling module includes a differential amplifier connected in parallel across the first resistor.

[0024] A differential amplifier can switch sampling levels and change sampling accuracy by changing the amplification gain factor.

[0025] Secondly, this application provides a battery state detection method applied to a battery, the battery comprising: a BMS and a current detection device, the current detection device having at least two different sampling levels, the current detection device being used to collect a bus current value flowing through a busbar based on one of the at least two different sampling levels, the BMS being connected to the current detection device; the method comprising: receiving a first bus current value from the current detection device; based on the first bus current value, controlling the current detection device to collect a bus current value based on a target sampling level, the target sampling level belonging to at least two different sampling levels; and determining the current state of the battery based on a second bus current value collected by the current detection device at the target sampling level, and a predefined correspondence between multiple intervals and multiple states of the battery.

[0026] The solution provided in this application uses a current detection device to detect the bus current value and further determines the battery status based on the bus current value. By detecting the battery status through the internal circuitry of the battery, the reliance on external load circuitry is eliminated, reducing limitations on the scope and scenarios for battery status detection.

[0027] In conjunction with the second aspect, in some possible implementations of the second aspect, each of at least two different sampling levels corresponds to a sampling precision, and / or, each of at least two different sampling levels corresponds to a preset output current capability, which represents the ability to output current within a preset size range.

[0028] The function of a current detection device with multiple sampling levels can be summarized in two aspects. First, the current detection device can detect current at different sampling accuracies, improving its adaptability to different current magnitudes. Second, different preset output current capabilities can keep the output current within different preset ranges, preventing sudden increases in output current, avoiding the generation of electrical sparks, and thus reducing the risk of safety hazards. Moreover, it can prevent the battery's output current from being too low when the electric equipment requires a large current, thus affecting the normal operation of the electric equipment.

[0029] In conjunction with the second aspect, in some possible implementations of the second aspect, at least two different sampling levels include a first sampling level and a second sampling level; when the first bus current value is greater than a preset threshold, the target sampling level is the first sampling level; or when the first bus current value is less than or equal to a preset threshold, the target sampling level is the second sampling level.

[0030] In conjunction with the second aspect, in some possible implementations of the second aspect, the current detection device includes: a first switch, a first resistor, a first current sampling module, a second resistor, and a second current sampling module. The resistance value of the second resistor is greater than the resistance value of the first resistor. The first switch is connected in series with the first resistor and in parallel with the second resistor. The first switch is used to control the current to switch between the first resistor and the second resistor. The first current sampling module is used to detect a first current value flowing through the first resistor, and the second current sampling module is used to detect a second current value flowing through the second resistor. The current detection device is configured such that when sampling at the first sampling position, the first switch is in a closed state, and the first bus current value is the first current value. When sampling at the second sampling position, the first switch is in an open state, and the first bus current value is the second current value.

[0031] By using two resistors with different resistance values ​​in the current detection device, the smaller resistance resistor can be used to detect the bus current value when the current value is large, and the larger resistance resistor can be used to detect the bus current value when the current value is small, thereby improving the measurement accuracy of the detected current.

[0032] In conjunction with the second aspect, in some possible implementations of the second aspect, based on the first bus current value, the current detection device is controlled to collect the bus current value based on the target sampling range, including: when the first bus current value is less than or equal to a preset threshold, controlling the first switch to open so that the current flows through the second resistor; or when the first bus current value is greater than the preset threshold, controlling the first switch to close so that the current flows through the first resistor.

[0033] In conjunction with the second aspect, in some possible implementations of the second aspect, the second resistor is used to achieve output current soft-start capability when the first bus current value is less than or equal to the preset threshold, the output current soft-start capability representing the ability to reduce the rate of change of the output current.

[0034] The ability to start with a soft-start output current can reduce the risk of electrical sparks caused by excessive instantaneous current, thus improving battery safety.

[0035] In conjunction with the second aspect, in some possible implementations of the second aspect, the second current sampling module includes a differential amplifier connected in parallel across the second resistor, or connected in parallel across the first resistor and the second resistor.

[0036] A differential amplifier can be used to measure the voltage difference across a resistor, and the amplification factor can be switched. When the current is small, switching to a larger amplification factor can improve the accuracy of current sampling under small current conditions.

[0037] In conjunction with the second aspect, in some possible implementations of the second aspect, the second current sampling module further includes a first measuring device for measuring the bus voltage value and a second measuring device for measuring the output voltage value; the method further includes: determining a second current value based on 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.

[0038] If the second current value is not convenient to measure directly, it can be indirectly calculated by measuring the bus voltage and output voltage.

[0039] In conjunction with the second aspect, in some possible implementations of the second aspect, the battery further includes: a second switch; the second switch being connected in series with a second resistor; the current detection device being configured such that the second switch is in an open state when sampling at the first sampling level; and the current detection device being configured such that the second switch is in a closed state when sampling at the second sampling level.

[0040] In conjunction with the second aspect, in some possible implementations of the second aspect, the current detection device includes a first resistor and a first current sampling module, the first resistor is located on the bus, the first current value is the first current value flowing through the first resistor, the first bus current value is the first current value, and the first current sampling module is used to detect the first current value.

[0041] Adding a second resistor improves measurement accuracy when detecting small currents. If high measurement accuracy is not required, the second resistor can be omitted, and the bus current value can be detected using only the first resistor and the first current sampling module.

[0042] In conjunction with the second aspect, in some possible implementations of the second aspect, the first current sampling module includes a differential amplifier connected in parallel across the first resistor.

[0043] A differential amplifier can switch sampling levels and change sampling accuracy by changing the amplification gain factor.

[0044] Thirdly, this application provides an electric device, including a battery as described in the first aspect and any possible implementation thereof, and an electrical device connected to the battery, wherein the battery is used to provide electrical energy to the electrical device.

[0045] Fourthly, this application provides a computer-readable storage medium including a computer program that, when run on a computer, enables the methods in the second aspect and any possible implementation thereof to be implemented.

[0046] Fifthly, this application provides a computer program product comprising: a computer program (also referred to as code or instructions) that, when executed, causes the methods in the second aspect and any possible implementation thereof to be implemented.

[0047] It should be understood that the technical solutions of the third to fifth aspects correspond to the first and second aspects, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, so they will not be repeated here. Attached Figure Description

[0048] Figure 1 This is a schematic diagram illustrating the usage scenarios of the battery provided in the embodiments of this application;

[0049] Figure 2 This is a schematic diagram of the battery structure provided in the embodiments of this application;

[0050] Figure 3 This is a flowchart illustrating the battery state detection method provided in this application;

[0051] Figure 4 This is a schematic diagram of a battery structure provided in an embodiment of this application;

[0052] Figure 5 This is a schematic diagram of a battery including a second current sampling module provided in an embodiment of this application;

[0053] Figure 6 This is a schematic diagram of a battery including a second switch provided in an embodiment of this application;

[0054] Figure 7 This is a schematic diagram showing the voltage level changes of the first and second switches when the bus current increases.

[0055] Figure 8 This is a schematic diagram showing the voltage level changes of the first and second switches when the bus current value decreases.

[0056] Figure 9 This is a schematic diagram of another battery structure provided in an embodiment of this application;

[0057] Figure 10 This is a schematic block diagram of the battery state detection device provided in the embodiments of this application;

[0058] Figure 11 This is another schematic block diagram of the battery state detection device provided in the embodiments of this application. Detailed Implementation

[0059] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0060] Figure 1 This is a schematic diagram illustrating the usage scenario of the battery provided in the embodiments of this application.

[0061] Many electric devices currently use batteries as their power source, and some of these batteries are replaceable. A battery can be in a state of being either in the device (providing power to the device) or charging in a charging device, or it can be neither in the device nor in a charging device. Batteries can be in different modes depending on their state. For example, when the battery is in the device or charging in a charging device, it can be in operating mode. When the battery is not in the device, it can be in a first-level sleep mode. When the battery is in the device but the device is not powered on, it is in a second-level sleep mode. When the battery is in the device and the device is powered on but not yet in operation, it is in a third-level sleep mode.

[0062] If the battery mode does not match its state, such as being in sleep mode when in an electric device, it may affect the normal operation of the device; if the battery is in working mode when not in use, it may generate excessive instantaneous current when the battery is connected to the load, causing an electrical spark and posing a safety hazard to the entire device.

[0063] Among them, electric equipment can be, for example, such as Figure 1 The electric motorcycle shown can also be other devices powered by electricity, such as, but not limited to, new energy vehicles, electric bicycles, electric scooters, electric ships, electric airplanes, electric flying cars, electric lawnmowers, electric construction equipment, trams, golf carts, electric trains, etc. This application does not limit the scope of these devices.

[0064] The electric equipment includes devices connected to a battery, which can be used to provide electrical energy to the devices. Examples of such devices include electric motors and vehicle lights; this application does not limit the scope of the application.

[0065] Current battery status detection methods require connecting a portion of the battery's circuitry to a portion of the load's circuitry to form a detection loop, through which a presence detection signal is sent. If the presence detection signal is received, the battery is determined to be in place; if not, it is determined to be out of place. However, this method requires detection loops in both the battery and the load. If no detection loop is present in the load, battery status cannot be detected, thus limiting its applicability.

[0066] In view of this, this application provides a solution that detects the state of the battery through the internal circuitry of the battery. Based on the detected bus current value and the correspondence between multiple ranges of predefined bus current values ​​and multiple states of the battery, the state of the battery is determined. Therefore, the detection of the battery state can be achieved without relying on the circuitry of an external load.

[0067] Figure 2 This is a schematic diagram of the battery structure provided in an embodiment of this application. Figure 2 As shown, the battery includes: a cell, a battery management system (BMS), and a current detection device.

[0068] The current detection device can be used to detect the bus current value; the battery cell is used to store electrical energy; there is an electrical signal connection between the BMS and the current detection device, and the BMS can obtain the bus current value from the current detection device.

[0069] The battery also includes a bus, and the bus voltage can be expressed in V. bus The output voltage of a battery can be represented by V. out To express.

[0070] based on Figure 2 Based on the provided battery structure, this application proposes a battery state detection method. Figure 3 This is a flowchart illustrating the battery state detection method provided in this application, which can be executed by a BMS. The following is combined with... Figure 3 The battery status detection method is explained in detail.

[0071] In step 310, a first bus current value is received from the current detection device. The first bus current value refers to the bus current value used to determine whether it is necessary to switch the sampling range.

[0072] exist Figure 2In the provided battery structure, the current detection device acquires the bus current value. This can be achieved by measuring the voltage V across a resistor with a known resistance R on the bus, and then calculating the bus current value I = V ÷ R; or by connecting it in series with the bus to directly detect the bus current value. This application does not impose any limitations on the method of detecting the bus current value.

[0073] There is an electrical signal connection between the BMS and the current detection device, so the current detection device can send the detected bus current value to the BMS.

[0074] In step 320, based on the first bus current value, the control current detection device collects the bus current value based on the target sampling range.

[0075] Based on such Figure 2 The battery structure shown can detect the bus current value and determine the battery's state based on that value. However, in situations such as... Figure 2 In the structure shown, if the current detection device includes only one sampling range for current detection, the detection scale may be limited, resulting in low measurement accuracy of the current value. Therefore, more sampling ranges can be added to the current detection device to improve measurement accuracy.

[0076] Furthermore, in certain situations, when a battery transitions from an inactive to an active state, it may generate excessive instantaneous current, potentially causing electrical sparks and posing a safety hazard to the battery and the electrical equipment. Different sampling levels correspond to different preset output current capabilities. These different preset output current capabilities keep the output current within a defined range, preventing sudden increases in output current and avoiding electrical sparks, thus reducing the risk of safety hazards. Additionally, it prevents situations where the battery's output current is too low when the electrical equipment requires a large current, thus ensuring the normal operation of the equipment.

[0077] In step 330, the current state of the battery is determined based on the second bus current value collected by the current detection device at the target sampling position, and the correspondence between multiple predefined intervals and various battery states. The second bus current value refers to the bus current value used to determine the battery state.

[0078] After the current detection device detects the bus current value, the BMS can obtain the bus current value from the current detection device. Then, the BMS determines the state of the battery based on the bus current value and the correspondence between multiple predefined intervals and multiple states of the battery.

[0079] For example, for some electric motorcycles, the predefined range of bus current value is 0-1 mA, and the battery status is "battery not in place"; the range of bus current value is 1-30 mA, and the battery status is "battery in place and vehicle operation lock closed"; the range of bus current value is 30-300 mA, and the battery status is "battery in place and vehicle operation lock open"; the range of bus current value is greater than 300 mA, and the battery status is "battery in place and vehicle is moving or battery is charging".

[0080] Figure 4 This is a schematic diagram of a battery structure provided in an embodiment of this application. For example... Figure 4 As shown, the battery includes: a cell, a BMS, and a current detection device. Figure 4 The current detection device shown has at least two sampling positions. Exemplarily, the current detection device includes a first switch, a first resistor, a first current sampling module, a second resistor, and a second current sampling module.

[0081] In this system, the first switch is connected in series with the first resistor; the first resistor and the second resistor are two resistors with known resistance values, and the resistance value R2 of the second resistor is greater than the resistance value R1 of the first resistor. Generally, the resistance value R2 of the second resistor can be much greater than the resistance value R1 of the first resistor, for example, the resistance value R2 of the second resistor is more than ten times the resistance value R1 of the first resistor; the first current sampling module can be used to detect the first current value flowing through the first resistor, and the second current sampling module can be used to detect the second current value flowing through the second resistor; the second resistor can be connected in parallel with the first switch; there is also an electrical signal connection between the BMS and the first switch, and the BMS can control and sense whether the first switch is in an open or closed state.

[0082] It should be understood that the second resistor is connected in parallel with the first switch, which can be as follows: Figure 4 As shown in (a), the second resistor is 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 across the first switch. Alternatively, it can be as follows: Figure 4 As shown in (b), the first switch is connected in series with the first resistor, and then in parallel with the second resistor; that is, the second resistor is connected in parallel across the first resistor and the first switch. This application does not limit this.

[0083] In such Figure 4 In the battery structure shown in (a), since the first switch and the second resistor are connected in parallel, the second resistor can be short-circuited 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. At this time, the bus current value is the first current value.

[0084] In such Figure 4In the battery structure shown in (b), since the first switch and the first resistor are connected in parallel with the second resistor, and the resistance of the first resistor is much smaller than that of the second resistor, after the first switch is closed, it can be approximated that the bus current no longer passes through the second resistor, which is equivalent to short-circuiting the second resistor. At this time, the bus current value is the first current value.

[0085] In such Figure 4 In the battery structures shown in (a) and (b), if the first switch is open, the bus current can pass through the second resistor, and at this time, the bus current value is the second current value.

[0086] The second current value can be measured using the second current sampling module.

[0087] One possible form of the second current sampling module is as follows: Figure 4 As shown, the second current sampling module may include a module for measuring the bus voltage value V. bus The first measuring device and the output voltage value V out The second measuring device. In such a case... Figure 4 In the battery structure shown in (a), when the first switch is open, V bus =V1+V2+V out Then V2 = V bus -V1-V out Since the resistance of the first resistor is very small compared to the resistance of the second resistor, the first voltage value V1 across the first resistor can be ignored. Therefore, it can be approximated that V2 = V bus -V out In such Figure 4 In the battery structure shown in (b), when the first switch is open, V bus =V2+V out Then V2 = V bus -V out Therefore, V can be measured by the first measuring device. bus V measured by the second measuring device out The voltage value V2 across the second resistor is calculated.

[0088] Another possible form of the second current sampling module is as follows: Figure 5 As shown. In the case of Figure 5 In the battery structure shown in (a), the second current sampling module is connected in parallel across the second resistor, and can detect the voltage value V2 across the second resistor. Figure 5In the battery structure shown in (b), the second current sampling module is connected in parallel across the first resistor and the second resistor. It can detect the sum of the voltage values ​​across the first resistor and the second resistor, V1+V2. Since the resistance of the first resistor is very small compared to the resistance of the second resistor, the first voltage value V1 across the first resistor can be ignored. Therefore, it can be approximately considered that the voltage value V2 across the second resistor is detected.

[0089] In such Figure 5 In the battery structure shown, the second current sampling module can be an electronic device such as a voltmeter or a differential amplifier, and this application does not limit this to any particular device. A differential amplifier can be used to measure the voltage difference across a resistor, and the amplification factor can be adjusted. A smaller amplification factor can be used when the current is large, and a larger amplification factor can be used when the current is small. The accuracy of the current sampling can be flexibly adjusted according to the usage requirements.

[0090] After obtaining the voltage value V2 across the second resistor through the two second current sampling modules described above, since the resistance value of the second resistor is known to be R2, the second current value can be obtained as I2 = V2 ÷ R2.

[0091] It should be understood that, in addition to, Figure 4 and Figure 5 In addition to the second current sampling module shown, the second current sampling module can also be connected in series with the second resistor to directly detect the second current value. This application does not limit the method of detecting the second current value.

[0092] Adding a second resistor with a larger resistance value than the first resistor to the current detection device can improve the sampling accuracy when detecting small currents.

[0093] For example, if the first resistor has a resistance of 1 ohm and the first current sampling module can detect voltage with an accuracy of 1 volt, then the accuracy of the first current sampling module in sampling current is 1 ampere; if the second resistor has a resistance of 100 ohms and the second current sampling module can also detect voltage with an accuracy of 1 volt, then the accuracy of the second current sampling module in sampling current is 0.01 ampere.

[0094] Furthermore, when the battery is in dormant mode, the bus current flows through the second resistor. Because the second resistor has a relatively large resistance, it increases the overall internal resistance of the battery. When the battery is inserted into the electrical device, the second resistor helps to achieve a slow-start capability for the output current. This slow-start capability refers to the ability to reduce the rate of change of the output current. This capability reduces the risk of electrical sparks caused by excessive instantaneous current, thus improving battery safety. When the battery is in operating mode, the bus current flows through the first resistor, which has a smaller resistance. Because the first resistor has a smaller resistance, even if the current through it is large, the battery's impact on the operation of the electrical device is relatively small.

[0095] In such Figure 4 or Figure 5 In the battery shown, when the bus current value is large, a first resistor can be used to detect the bus current value, which is the first current value flowing through the first resistor. When the bus current value is small, a second resistor can be used to detect the bus current value, which is the second current value flowing through the second resistor. Therefore, a threshold can be set for switching between the first and second resistors, denoted here as the preset threshold. When the bus current value is greater than the preset threshold, the target sampling level is the first sampling level, and the BMS can control the first switch to close. The bus current value is the first current value, which can be detected by the first current sampling module, and then the BMS can determine the battery status based on the first current value. When the bus current value is less than or equal to the preset threshold, the target sampling level is the second sampling level, and the BMS can control the first switch to open. The bus current value is the second current value, which can be detected by the second current sampling module, and then the BMS can determine the battery status based on the second current value.

[0096] For ease of distinction and explanation, the bus current value used to determine whether to switch sampling levels is denoted as the first bus current value, and the bus current value used to determine the battery status is denoted as the second bus current value. In other words, when the first bus current value is greater than a preset threshold, the first sampling level is used to collect the bus current value; that is, the first sampling level is used as the target sampling level. When the first bus current value is less than or equal to the preset threshold, the second sampling level is used to collect the bus current value; that is, the second sampling level is used as the target sampling level.

[0097] The bus current value collected based on the target sampling level is the second bus current value. Therefore, it can be understood that the bus current value used in this article to determine the battery status based on the bus current value is the second bus current value.

[0098] It should be understood that the first bus current value and the second bus current value are defined only for the convenience of distinguishing different functions and should not constitute any limitation on this application. The first bus current value and the second bus current value may be the same, for example, if it is determined based on the first bus current value that no gear switching is required, then 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 based on the first bus current value that a gear switching is required, then 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.

[0099] The bus current value of a battery varies under different operating conditions, and its state and mode may also differ. The following example uses a preset threshold of 300 mA.

[0100] When the battery is removed, the battery bus current is less than 300 mA. At this time, the first switch is open, the target sampling range is the second sampling range, and the bus current value is the second current value. The BMS obtains the second current value from the second current sampling module. For example, if the second current value is 0.5 mA, within the predefined range of 0 to 1 mA, then the battery is in an off-site state, and its mode is the first-level sleep mode.

[0101] When the battery is installed on the electric motorcycle but the motorcycle is not yet started, its instrument panel and onboard system are in a powered-off state, and the battery's bus current value is less than 300 mA. At this time, the first switch is in the open state, the target sampling level is the second sampling level, and the bus current value is the second current value. The BMS obtains the second current value from the second current sampling module. For example, if the second current value is 20 mA, within the predefined range of 1 to 30 mA, then the battery is in the "in-place" state, and its mode is the second-level sleep mode.

[0102] When the electric motorcycle is not in motion, its instrument panel and onboard system are powered on, and the battery bus current is less than 300 mA. At this time, the first switch is off, the target sampling level is the second sampling level, and the bus current value is the second current value. The BMS obtains the second current value from the second current sampling module. For example, if the second current value is 200 mA, within the predefined range of 30 to 300 mA, then the battery is in the "on" state, and its mode is the three-level sleep mode.

[0103] When the electric motorcycle is in motion or the battery is charging, if the battery bus current value is greater than 300 mA, the BMS can control the first switch to close. The target sampling level is the first sampling level, and the bus current value is the first current value. The BMS obtains the first current value from the first current sampling module. For example, the first current value is 1 ampere. If it is within a predefined range greater than 300 mA, then the battery is in the in-situ state and its mode is the working mode.

[0104] As can be seen from the above example, when the battery's bus current is greater than the preset threshold, the battery is in working mode; when the battery's bus current is less than or equal to the preset threshold, the battery is in sleep mode.

[0105] Optionally, such as Figure 6 As shown, the battery may also include a second switch, which is connected in series with a second resistor.

[0106] The second switch and the second resistor can be connected in series in the following way: Figure 6 As shown in (a), the second switch and the second resistor are connected in series, and then connected in parallel with the first switch. The second switch, the second resistor, and the first switch are then connected in series with the first resistor as a whole; alternatively, it can be as follows: Figure 6 As shown in (b), the second switch is connected in series with the second resistor, and the first switch is connected in series with the first resistor. The second switch and the second resistor form one branch, and the first switch and the first resistor also form one branch. These two branches are then connected in parallel. This application does not limit this.

[0107] In such Figure 6 In the battery shown, when the bus current value is greater than a preset threshold, the BMS can control the first switch to close and the second switch to open, 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 can control the first switch to open and the second switch to close, so that the current flows through the second resistor.

[0108] To ensure the continuity of the battery bus current, the first and second switches can be controlled to open or close in an orderly manner. For example, when the bus current value is greater than a preset threshold, the BMS controls the first switch to close no later than the second switch to open; when the bus current value is less than or equal to the preset threshold, the BMS controls the second switch to close no later than the first switch to open.

[0109] When the bus current increases, the voltage levels of the first and second switches change as follows: Figure 7 As shown, the bus current rises above the preset threshold at time t1, the first switch closes at time t2, and the second switch opens at time t3, with t1≤t2≤t3.

[0110] When the bus current decreases, the voltage levels of the first and second switches change as follows: Figure 8 As shown, the bus current value decreases to below the preset threshold at time t4, the second switch closes at time t5, and the first switch opens at time t6, with t4≤t5≤t6.

[0111] The solution provided in this application uses a current detection device to detect the bus current value and further determines the battery status based on the bus current value. Detecting the battery status through internal battery circuitry eliminates reliance on external load circuits, reducing limitations on the scope and scenarios for battery status detection. Furthermore, this solution can further determine the battery mode, facilitating the matching of battery power output with electric equipment, improving battery safety, and reducing the battery's impact on electric equipment.

[0112] In some cases, where the accuracy requirement for current detection is not high, the current detection device may include the first resistor mentioned above, but not the second resistor. Figure 9 This is a schematic diagram of another battery structure provided in an embodiment of this application. For example... Figure 9 As shown, the battery includes: a cell, a battery management system (BMS), and a current detection device.

[0113] The current detection device includes a first current sampling module and a first resistor, which can be used to detect the bus current value; the battery cell is used to store electrical energy; there is an electrical signal connection between the BMS and the first current sampling module, and the BMS can obtain the bus current value from the first current sampling module.

[0114] It should be understood that, such as Figure 9 The diagram shown is a structural schematic of a battery provided in an embodiment of this application. The first current sampling module detects the bus current value in the following manner: Figure 9 As shown, the first current sampling module is connected in parallel across the first resistor to detect the voltage across the first resistor, and then the bus current value is calculated using the voltage and resistance values; alternatively, the first current sampling module can be connected in series with the first resistor to directly detect the bus current value. This application does not limit the method of detecting the bus current value.

[0115] In the above case, the first current sampling module can be a differential amplifier. The differential amplifier can switch sampling levels and change the sampling accuracy by changing the amplification gain factor.

[0116] The solution provided in this application uses a current detection device to detect the bus current value and further determines the battery status based on the bus current value. By detecting the battery status through the internal circuitry of the battery, the reliance on external load circuitry is eliminated, reducing limitations on the scope and scenarios for battery status detection.

[0117] Figure 10 This is a schematic block diagram of the battery state detection device provided in the embodiments of this application, such as... Figure 10 As shown, the battery status detection device 1000 may include a receiving module 1010, a control module 1020, and a determining module 1030.

[0118] This device can be used to achieve Figure 3 The method embodiment shown illustrates the function of the battery or the BMS within the battery.

[0119] The receiving module 1010 can be used to receive the first bus current value from the current detection device; the control module 1020 can be used to control the current detection device to collect the bus current value based on the first bus current value and the target sampling range; the determining module 1030 can be used to determine the current state of the battery based on the second bus current value collected by the current detection device at the target sampling range and the correspondence between multiple predefined intervals and multiple states of the battery.

[0120] Optionally, the control module 1020 can be used to control the first switch to open when the bus current value is less than or equal to a preset threshold, so that the current flows through the second resistor; or to control the first switch to close when the bus current value is greater than the preset threshold, so that the current flows through the first resistor.

[0121] Optionally, the determining module 1030 can also be used to determine the second current value based on 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.

[0122] It should be understood that the module division in the embodiments of this application is illustrative and only represents a logical functional division. In actual implementation, there may be other division methods. Furthermore, the functional modules in the various embodiments of this application can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0123] Figure 11 This is another schematic block diagram of the battery state detection device provided in the embodiments of this application. For example... Figure 11 As shown, the device 1100 may include at least one processor 1110, which can be used to implement the functions of the BMS in the above method embodiments. See the detailed description in the method examples for further details, which will not be repeated here.

[0124] The device 1100 may further 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, which can be electrical, mechanical, or other forms, for information exchange between devices, units, or modules. The processor 1110 may operate in conjunction with the memory 1120. The processor 1110 may execute program instructions stored in the memory 1120. At least one of the at least one memory may be included in the processor.

[0125] The device 1100 may further include a communication interface 1130 for communicating with other devices via a transmission medium, thereby enabling communication between devices in the device 1100 and other devices. The communication interface 1130 may be, for example, a transceiver, interface, bus, circuit, or a device capable of transmitting and receiving functions. The processor 1110 may utilize the communication interface 1130 to transmit and receive data and / or information, and to implement... Figure 3 The battery state detection method described in the corresponding embodiment.

[0126] This application does not limit the specific connection medium between the processor 1110, memory 1120, and communication interface 1130. This application... Figure 11 The processor 1110, memory 1120, and communication interface 1130 are connected via bus 1140. Bus 1140 is... Figure 11 The connections between other components are shown in bold and are for illustrative purposes only, not as limiting information. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, Figure 11 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0127] In the embodiments of this application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components, capable of implementing or executing the methods, steps, and logic block diagrams disclosed in this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in this application can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0128] According to the method provided in this application, this application also provides an electric device, which includes, as follows: Figure 2 , Figure 4 , Figure 5 , Figure 6 or Figure 9The corresponding embodiment describes a battery and an electrical device connected to the battery, wherein the battery is used to provide electrical energy to the electrical device.

[0129] According to the method provided in this application, this application also provides a computer-readable storage medium storing program code, which, when executed on a computer, causes the computer to perform... Figure 3 The battery state detection method described in the corresponding embodiment.

[0130] According to the method provided in this application, this application also provides a computer program product, which includes computer program code. When the computer program code is run on a computer, it causes the computer to perform... Figure 3 The battery state detection method described in the corresponding embodiment.

[0131] The technical solutions provided in this application can be implemented in whole or in part through software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented in whole or in part as 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, all or part of the processes or functions described in this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired means, such as coaxial cable, optical fiber, digital subscriber line (DSL), or wireless means (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can 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, etc.

[0132] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery, characterized by, The application relates to a battery management system (BMS) and a current detection device, the current detection device has at least two different sampling gears, and the current detection device 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 collect the bus current value based on a target sampling gear based on the first bus current value, the target sampling gear belongs to the at least two different sampling gears; each sampling gear of the at least two different sampling gears corresponds to a sampling accuracy, and / or each sampling gear of the at least two different sampling gears is used for corresponding to a preset output current capacity, the preset output current capacity represents the ability of outputting current in a preset size range; The at least two different sampling gears include a first sampling gear and a second sampling gear; when the first bus current value is greater than a preset threshold, the target sampling gear is the first sampling gear; or when the first bus current value is less than or equal to the preset threshold, the target sampling gear is the second sampling gear; determining a current state of the battery based on a second bus current value collected by the current detection device in the target sampling gear and a predefined correspondence relationship between a plurality of intervals and a plurality of states of the battery; wherein the predefined correspondence relationship between the plurality of intervals and the plurality of states of the battery includes: when the interval of the bus current value is in the range of 0-1 mA, the state of the battery is that the battery is not in place; when the interval of the bus current value is in the range of 1-30 mA, the state of the battery is that the battery is in place and the vehicle running lock is closed; when the interval of the bus current value is in the range of 30-300 mA, the state of the battery is that the battery is in place and the vehicle running lock is opened; and when the interval of the bus current value is greater than 300 mA, the state of the battery is that the battery is in place and the vehicle is running or the battery is charging. The current detection device includes a first switch, a first resistor, a first current sampling module, a second resistor and a second current sampling module, the resistance value of the second resistor is greater than that of the first resistor, the first switch is connected in series with the first resistor, the first switch is connected in parallel with the second resistor, the first switch is used for controlling the switching of current 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; 2. The battery of claim 1, wherein, The current detection device is arranged to be in a closed state in the first sampling gear, and the first bus current value is the first current value; The current detection device is arranged to be in an open state in the second sampling gear, and the first bus current value is the second current value. ​ 3. The battery of claim 2, wherein the cathode comprises a lithium metal oxide. The BMS is specifically used for controlling the current detection device to collect the bus current value based on a target sampling gear when the BMS is used for controlling the current detection device to collect the bus current value based on the first bus current value. The first switch is controlled to be opened when the first bus current value is less than or equal to the preset threshold, so that the current flows through the second resistor; or The first switch is controlled to be closed when the first bus current value is greater than the preset threshold, so that the current flows through the first resistor.

4. The battery of claim 2, wherein the cathode comprises a lithium metal oxide. The second current sampling module includes a differential amplifier connected in parallel across the second resistor or connected in parallel across the first resistor and the second resistor.

5. The battery of claim 2, wherein the cathode comprises a lithium cobalt oxide. The second current sampling module includes a first measuring device for measuring a bus voltage value and a second measuring device for measuring an output voltage value. The second current sampling module is specifically used for determining 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.

6. The battery of any one of claims 2 to 5, wherein, The battery further includes a second switch connected in series with the second resistor. The current detection device is configured to have the second switch in an open state when the first sampling gear is sampled. The current detection device is configured to have the second switch in a closed state when the second sampling gear is sampled.

7. The battery of claim 6, wherein the cathode is a lithium cobalt oxide cathode. The first current sampling module includes a differential amplifier connected in parallel across the first resistor.

8. A battery state detection method characterized by, The battery includes a battery management system (BMS) and a current detection device having at least two different sampling gears, the current detection device being used for collecting a bus current value flowing through a bus based on one of the at least two different sampling gears, and the BMS being connected with the current detection device. The method includes: receiving a first bus current value from the current detection device; controlling the current detection device to collect the bus current value based on a target sampling gear based on the first bus current value, the target sampling gear belonging to the at least two different sampling gears, each of the at least two different sampling gears corresponding to a sampling accuracy, and / or each of the at least two different sampling gears corresponding to a preset output current capacity representing an ability of outputting a current in a preset size range; the at least two different sampling gears include a first sampling gear and a second sampling gear, the target sampling gear being the first sampling gear when the first bus current value is greater than the preset threshold, or the target sampling gear being the second sampling gear when the first bus current value is less than or equal to the preset threshold; and the first sampling gear corresponds to a first sampling accuracy and a first preset output current capacity, and the second sampling gear corresponds to a second sampling accuracy and a second preset output current capacity, the first sampling accuracy being higher than the second sampling accuracy, and the first preset output current capacity being lower than the second preset output current capacity. determine the current state of the battery based on the second bus current value collected by the current detection device at the target sampling gear and a predefined plurality of intervals and a corresponding relationship between the plurality of intervals and a plurality of states of the battery, wherein the corresponding relationship between the plurality of intervals and the plurality of states of the battery comprises: when the interval of the bus current value is in a range of 0-1 mA, the state of the battery is that the battery is not in place; when the interval of the bus current value is in a range of 1-30 mA, the state of the battery is that the battery is in place and the vehicle running lock is closed; when the interval of the bus current value is in a range of 30-300 mA, the state of the battery is that the battery is in place and the vehicle running lock is opened; and when the interval of the bus current value is greater than 300 mA, the state of the battery is that the battery is in place and the vehicle is running or the battery is charging.

9. The method of claim 8, wherein, 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 resistance value of the second resistor is greater than the resistance value of the first resistor, the first switch is connected in series with the first resistor, the first switch is connected in parallel with the second resistor, the first switch is used to control the switching of the current between the first resistor and the second resistor, the first current sampling module is used to detect a first current value flowing through the first resistor, and the second current sampling module is used to detect a second current value flowing through the second resistor. The current detection device is configured to be in a closed state when sampling at the first sampling gear, and the first bus current value is the first current value. The current detection device is configured to be in an open state when sampling at the second sampling gear, and the first bus current value is the second current value.

10. The method of claim 9, wherein, The control of the current detection device to collect 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 less than or equal to the preset threshold, the first switch is controlled to be opened, so that the current flows through the second resistor; or when the first bus current value is greater than the preset threshold, the first switch is controlled to be closed, so that the current flows through the first resistor.

11. An electrically powered device, characterized by The battery as claimed in any one of claims 1 to 7, and a power consumption device connected to the battery, wherein the battery is used to provide electric energy to the power consumption device.

12. A computer-readable storage medium having stored thereon a computer program, characterized in that The computer program is executed by a processor to implement the method as claimed in any one of claims 8 to 10. The computer program is executed by a processor to implement the method as claimed in any one of claims 8 to 10.

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