Battery

Abstract

The utility model provides a battery which comprises a battery cell module, the battery cell module comprises at least two battery cell groups, each battery cell group comprises a battery cell and a sampling resistor which are connected in series, and the at least two battery cell groups are connected in parallel. And the protection module is electrically connected between the battery cell module and the connecting end, is configured to correspondingly obtain the electric power parameter of each battery cell through the sampling resistor, and is configured to cut off the electric connection between the battery cell module and the connecting end when the electric power parameter of any battery cell meets a preset condition. Therefore, according to the battery provided by the invention, the battery cell module can be accurately and reliably protected according to the electric power parameter of the single battery cell, and the safety performance of the battery is improved.

Description

Battery Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a multi-cell parallel battery. Background Technology

[0002] A multi-cell parallel battery consists of a cell module and a protection circuit. The cell module comprises multiple cells connected in parallel. The protection module protects the cell module by detecting the total current and / or total voltage of the cell module. However, the protection module cannot accurately and reliably protect individual cells or promptly disconnect the main circuit power supply. Summary of the Invention

[0003] In view of the above problems, this application provides a battery, including: a connection terminal configured to connect to an external device; a cell module including at least two cell groups, each cell group including cells connected in series and a sampling resistor, the at least two cell groups being connected in parallel; and a protection module electrically connected between the cell module and the connection terminal and disposed on the main circuit, configured to acquire the power parameters of each cell respectively through the sampling resistor, and configured to disconnect the electrical connection between the cell module and the connection terminal when the power parameters of any cell meet a preset condition.

[0004] In one possible implementation, the battery module includes a first battery cell group and a second battery cell group. The first battery cell group includes a first battery cell. The second battery cell group includes a second battery cell. The protection module includes a first protection module and a second protection module. The first protection module is configured to acquire the power parameters of the first battery cell and is configured to disconnect the electrical connection between the battery module and the connection terminal when the power parameters of the first battery cell meet a preset condition. The second protection module is configured to acquire the power parameters of the second battery cell and is configured to disconnect the electrical connection between the battery module and the connection terminal when the power parameters of the second battery cell meet a preset condition.

[0005] In one possible implementation, the first protection module includes a first control module and a first switching element, and the second protection module includes a second control module and a second switching element. Both the first and second switching elements are electrically connected between the battery cell module and the connection terminal. The first control module is configured to acquire the power parameters of the first battery cell and is configured to control the first switching element to open when the power parameters of the first battery cell meet a preset condition, thereby cutting off the electrical connection between the battery cell module and the connection terminal. The second control module is configured to acquire the power parameters of the second battery cell and is configured to control the second switching element to open when the power parameters of the second battery cell meet a preset condition, thereby cutting off the electrical connection between the battery cell module and the connection terminal.

[0006] In one possible implementation, the power parameters include current, and the protection module is configured to acquire the voltage across each sampling resistor to obtain the current of the cell connected in series with each sampling resistor.

[0007] In one possible implementation, the preset conditions include the cell current being greater than a preset overcurrent threshold.

[0008] In one possible implementation, the first cell group includes a first sampling resistor. The second cell group includes a second sampling resistor, with the first sampling resistor connected in series with the first cell. The second sampling resistor is connected in series with the second cell. Both the first and second control modules include a current detection terminal and a ground terminal, and the cell module includes a positive terminal and a negative terminal. The first terminal of the first sampling resistor is electrically connected to the negative terminal of the first cell and the ground terminal of the first control module, and the second terminal of the first sampling resistor is electrically connected to the current detection terminal of the first control module and the negative terminal of the cell module. The first terminal of the second sampling resistor is electrically connected to the negative terminal of the second cell and the ground terminal of the second control module, and the second terminal of the second sampling resistor is electrically connected to the current detection terminal of the second control module and the negative terminal of the cell module.

[0009] In one possible implementation, the negative terminal of the battery cell module, the first switching element, and the second switching element are connected in series.

[0010] In one possible implementation, the first cell group includes a first sampling resistor. The second cell group includes a second sampling resistor. The first sampling resistor is connected in series with the first cell. The second sampling resistor is connected in series with the second cell. Both the first control module and the second control module include a current detection terminal and a positive voltage terminal. The cell module includes a positive terminal and a negative terminal. The first terminal of the first sampling resistor is electrically connected to the positive terminal of the cell module and the positive voltage terminal of the first control module, and the second terminal of the first sampling resistor is electrically connected to the positive terminal of the first cell and the current detection terminal of the first control module. The first terminal of the second sampling resistor is electrically connected to the positive terminal of the cell module and the positive voltage terminal of the second control module, and the second terminal of the second sampling resistor is electrically connected to the positive terminal of the second cell and the current detection terminal of the second control module.

[0011] In one possible implementation, the positive terminal of the battery cell module, the first switching element, and the second switching element are connected in series.

[0012] In one possible implementation, the power parameters include voltage, and the preset conditions include the cell voltage being greater than a preset overvoltage threshold or less than a preset undervoltage threshold.

[0013] In one possible implementation, both the first control module and the second control module include a power supply terminal and a ground terminal. The positive terminal of the first battery cell is electrically connected to the power supply terminal of the first control module, and the negative terminal of the first battery cell is electrically connected to the ground terminal of the first control module. The positive terminal of the second battery cell is electrically connected to the power supply terminal of the second control module, and the negative terminal of the second battery cell is electrically connected to the ground terminal of the second control module.

[0014] Therefore, the battery provided in this application can collect the power parameters of each parallel cell by means of sampling resistors connected in series with multiple parallel cells. This allows for accurate and reliable protection of the cell module and main circuit based on the power parameters of individual cells, thereby improving the battery's safety performance. Attached Figure Description

[0015] Figure 1 is a schematic diagram of a battery provided in an embodiment of this application.

[0016] Figure 2 is a schematic diagram of a battery cell module and a protection module provided in an embodiment of this application.

[0017] Figure 3 is a schematic diagram of the first protection module and the second protection module provided in an embodiment of this application.

[0018] Figure 4 is a circuit diagram of a battery provided in an embodiment of this application.

[0019] Figure 5 is a circuit diagram of a battery provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings.

[0021] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For example, A can be directly connected to C, and C can be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connects to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0022] In the description of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone.

[0023] In the description of this application, the terms "first," "second," etc., are configured only to distinguish different objects and do not limit the quantity or order of execution, nor do they imply that they must be different. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0024] Please refer to Figure 1, which is a schematic diagram of a battery 10 provided in an embodiment of this application.

[0025] The battery 10 includes a cell module 11, a protection module 12, and a connection terminal 13. The cell module 11 is electrically connected to the connection terminal 13. The connection terminal 13 is configured to connect to an external device. The external device includes a charging device or an electrical appliance. The charging device, such as a charger, is configured to charge the cell module 11 via the connection terminal 13. The electrical appliance, such as a load device or a terminal device, is configured to receive power from the cell module 11 via the connection terminal 13.

[0026] The circuit between the cell module 11 and the connection terminal 13 is the main circuit. That is, the main circuit is the charging and discharging circuit of the cell module 11.

[0027] The cell module 11 includes at least two cells or cell groups, with multiple cells or cell groups connected in parallel to each other to form a multi-cell parallel cell module 11. Thus, the multi-cell parallel cell module 11 can increase the capacity of the battery 10, extend the discharge time of the battery 10, enhance the current output capability of the battery 10, reduce the load on individual cells, and improve the reliability and stability of the battery 10.

[0028] Protection module 12 is electrically connected to cell module 11. Protection module 12 is also electrically connected between cell module 11 and connection terminal 13. Protection module 12 is configured to detect the electrical parameters of each cell and, when the electrical parameters of any cell meet preset conditions, disconnect the electrical connection between cell module 11 and connection terminal 13, that is, disconnect the main circuit. The electrical parameters may include voltage, current, output power, temperature, state of charge (SOC), and state of health (SOH). Meeting preset conditions may include the cell's electrical parameters exceeding preset normal ranges. For example, the cell voltage is greater than a preset overvoltage threshold, i.e., cell overvoltage. Another example is that the cell voltage is less than a preset undervoltage threshold, i.e., cell undervoltage. Yet another example is that the cell temperature is greater than a preset overtemperature threshold, i.e., cell overtemperature. And yet another example is that the cell current is greater than a preset overcurrent threshold, i.e., cell overcurrent. In this way, the protection module 12 can detect the current parameters of individual cells and protect the cell module 11 when the power parameters of any cell meet the preset conditions. This can reduce the safety risks of battery 10 swelling, bulging, and fire caused by bias current due to inconsistent internal resistance of multiple cells, and improve the reliability of battery 10 protection.

[0029] Specifically, please refer to Figure 2, which is a schematic diagram of a battery module 11 and a protection module 12 provided in an embodiment of this application. Here, the battery module 11 includes a first battery group and a second battery group, the first battery group includes a first battery B1, the second battery group includes a second battery B2, and the protection module 12 includes a first protection module 121 and a second protection module 122, as an example for explanation. However, this application does not further limit the number of battery cells included in the battery module 11 or the number of protection modules 12, only requiring that the number of battery cells included in the battery module 11 and the number of protection modules 12 are at least two.

[0030] The first and second battery cell groups are connected in parallel. The first ends of the first battery cell B1 and the second battery cell B2 are both connected to the first end of the battery cell module 11, and the second ends of the first battery cell B1 and the second battery cell B2 are both connected to the second end of the battery cell module 11.

[0031] The first protection module 121 is connected to the first battery cell B1. The first protection module 121 is configured to acquire the power parameters of the first battery cell B1 and to disconnect the electrical connection between the battery cell module 11 and the connection terminal 13 when the power parameters of the first battery cell B1 meet the preset conditions.

[0032] The second protection module 122 is connected to the second battery cell B2. The second protection module 122 is configured to acquire the power parameters of the second battery cell B2 and to disconnect the electrical connection between the battery cell module 11 and the connection terminal 13 when the power parameters of the second battery cell B2 meet preset conditions.

[0033] In this embodiment, the number of protection modules is equal to the number of battery cells, and each protection module acquires the power parameters of each battery cell.

[0034] In this way, the protection module 12 can be connected to each battery cell to obtain the power parameters of each battery cell. Based on whether the power parameters of each battery cell meet the preset conditions, it can independently connect or disconnect the circuit between the battery cell module 11 and the connection terminal 13, that is, the electrical connection of the main circuit, so as to achieve accurate and reliable protection of the battery cell module 11 according to the power parameters of each battery cell.

[0035] In some embodiments, the first terminals of the first cell B1 and the second cell B2 can be positive terminals. The second terminals of the first cell B1 and the second cell B2 can be negative terminals. The first terminal of the cell module 11 can be a positive terminal. The second terminal of the cell module 11 can be a negative terminal. Alternatively, the first terminals of the first cell B1 and the second cell B2 can be negative terminals. The second terminals of the first cell B1 and the second cell B2 can be positive terminals. The first terminal of the cell module 11 can be a negative terminal. The second terminal of the cell module 11 can be a positive terminal. In this way, the protection module 12 can be connected to the positive terminal or the negative terminal of the cell module 11, thereby realizing positive terminal protection or negative terminal protection of the cell module 11, which has a wide range of applications and good compatibility.

[0036] Please refer to Figure 3, which is a schematic diagram of a first protection module 121 and a second protection module 122 provided in an embodiment of this application. The first protection module 121 further includes a first control module U1 and a first switch module Q1, and the second protection module 122 further includes a second control module U2 and a second switch module Q2. The battery cell module 11, the first switch module Q1, the second switch module Q2, and the connection terminal 13 are connected in series in sequence.

[0037] The first control module U1 is connected to the first battery cell B1 and the first switch module Q1. The first control module U1 is configured to acquire the power parameters of the first battery cell B1 and is configured to disconnect the first switch module Q1 when the power parameters of the first battery cell B1 meet the preset conditions, thereby cutting off the electrical connection between the battery cell module 11 and the connection terminal 13.

[0038] The second protection module 122 is connected to the second battery cell B2 and the second switch module Q2. The second control module U2 is configured to acquire the power parameters of the second battery cell B2 and is configured to disconnect the second switch module Q2 when the power parameters of the second battery cell B2 meet the preset conditions, thereby cutting off the electrical connection between the battery cell module 11 and the connection terminal 13.

[0039] Thus, since the cell module 11, the first switch module Q1, the second switch module Q2, and the connection terminal 13 are connected in series, when either the first switch module Q1 or the second switch module Q2 is disconnected, the electrical connection between the cell module 11 and the connection terminal 13 will be broken, thereby disconnecting the main circuit and stopping the charging and discharging of the cell module 11. In other words, when the power parameters of any cell in the cell module 11 exceed the preset normal range, the electrical connection between the cell module 11 and the connection terminal 13 will be broken, thereby improving the protection accuracy and reliability of the battery 10 and reducing potential safety hazards.

[0040] In some embodiments, the positions of the first switch module Q1 and the second switch module Q2 can be interchanged. This application does not impose any limitation on the connection order of the multiple switch modules connected in series between the cell module 11 and the connection terminal 13.

[0041] Please refer to Figure 4, which is a circuit diagram of a battery 101 provided in an embodiment of this application. The battery 10 in Figures 1 to 3 can be the battery 101 provided in this embodiment. In the battery 101, the connection terminal 13 includes a connection terminal P+ and a connection terminal P-. Both the first control module U1 and the second control module U2 include a current detection terminal VI, a ground terminal GND, a switch control terminal, and a power supply terminal VDD. Both the first switch module Q1 and the second switch module Q2 include at least one switching element. Here, the description is based on the example of the first switch module Q1 including a first switching element M1 and a second switching element M2, and the second switch module Q2 including a third switching element M3 and a fourth switching element M4. However, this application does not limit the number of switching elements, switch types, or connection relationships between the first control module U1 and the second control module U2.

[0042] Each of the first switching elements M1 to the fourth switching element M4 includes at least one switch. The at least one switch can be a semiconductor switch, such as a MOSFET or transistor, or a relay or mechanically controlled switch. Here, the example given is that each of the first switching elements M1 to the fourth switching element M4 includes a charging switch and a discharging switch, wherein both the charging switch and the discharging switch are NMOS transistors. However, this application does not limit the number of switches, the type of switches, or the connection relationship between the first switching elements M1 to the fourth switching element M4. Correspondingly, to realize the on / off control of the first switching module Q1 and the second switching module Q2, the switch control terminals of both the first control module U1 and the second control module U2 include a charging switch control terminal CHG and a discharging switch control terminal DSG.

[0043] The first switching element M1 and the second switching element M2 are connected in parallel. The third switching element M3 and the fourth switching element M4 are connected in parallel. The charging switch control terminal CHG of the first control module U1 is electrically connected to the control terminals of the charging switching transistors in the first switching element M1 and the second switching element M2. The discharging switch control terminal DSG of the first control module U1 is electrically connected to the control terminals of the discharging switching transistors in the first switching element M1 and the second switching element M2. The charging switch control terminal CHG of the second control module U2 is electrically connected to the control terminals of the charging switching transistors in the third switching element M3 and the fourth switching element M4. The discharging switch control terminal DSG of the second control module U2 is electrically connected to the control terminals of the discharging switching transistors in the third switching element M3 and the fourth switching element M4. In this way, multiple switching elements are connected in parallel to form a switching module, which can improve the current carrying capacity of the switching module, reduce the on-resistance of the switching module, improve the reliability of the switching module through redundancy design, and reduce the heat generation of the battery 101.

[0044] Furthermore, in battery 101, the negative terminal of cell module 11, the first switch module Q1, the second switch module Q2, and the connection terminal P- are connected in series in sequence. This series connection of the first switch module Q1 and the second switch module Q2 creates a redundant design, reducing the probability of protection failure due to a fault in either the first switch module Q1 or the second switch module Q2, while also providing negative terminal protection for cell module 11.

[0045] In battery 101, cell module 11 also includes at least two sampling resistors. The number of sampling resistors can be set according to the number of cells. Each sampling resistor is electrically connected between the corresponding cell and one end of cell module 11. Here, we will take the example of a first cell group including a first sampling resistor RS1 and a second cell group including a second sampling resistor RS2 for explanation.

[0046] The first terminal VSS1 of the first sampling resistor RS1 is electrically connected to the negative terminal of the first battery cell B1 and the ground terminal GND of the first control module U1. The second terminal C of the first sampling resistor RS1 is electrically connected to the current detection terminal VI of the first control module U1 and the negative terminal of the battery cell module 11. The first terminal VSS2 of the second sampling resistor RS2 is electrically connected to the negative terminal of the second battery cell B2 and the ground terminal GND of the second control module U2. The second terminal C of the second sampling resistor RS2 is electrically connected to the current detection terminal VI of the second control module U2 and the negative terminal of the battery cell module 11.

[0047] Based on this, the first control module U1 can obtain the power parameters of the first battery cell B1 through the first sampling resistor RS1, and determine whether the power parameters of the first battery cell B1 meet the preset conditions, thereby controlling the on / off state of the first switch module Q1. Specifically, the first control module U1 can obtain the voltage of the first sampling resistor RS1 based on the voltage between its current detection terminal VI and the ground terminal GND, and then obtain the current value flowing through the first sampling resistor RS1, that is, the current value of the first battery cell B1, based on the resistance value of the first sampling resistor RS1. The first control module U1 can compare the obtained current value of the first battery cell B1 with a preset overcurrent threshold. When the current threshold of the first battery cell B1 is greater than the preset overcurrent threshold, it indicates that the first battery cell B1 is overcurrent, and the power parameters of the first battery cell B1 meet the preset conditions. At this time, the first control module U1 outputs a corresponding control signal through the charging switch control terminal CHG to disconnect the charging switch tubes in the first switching element M1 and the second switching element M2, and / or outputs a corresponding control signal through the discharging switch control terminal DSG to disconnect the discharging switch tubes in the first switching element M1 and the second switching element M2, thereby disconnecting the electrical connection between the negative terminal of the cell module 11 and the connection terminal P-, and realizing the protection function of the cell module 11 based on single cell overcurrent detection.

[0048] Similarly, the second control module U2 can obtain the power parameters of the second battery cell B2 through the second sampling resistor RS2, and determine whether the power parameters of the second battery cell B2 meet the preset conditions, thereby controlling the on / off state of the second switch module Q2. Specifically, the second control module U2 can obtain the voltage of the second sampling resistor RS2 based on the voltage between its current detection terminal VI and the ground terminal GND, and then obtain the current value flowing through the second sampling resistor RS2, that is, the current value of the second battery cell B2, based on the resistance value of the second sampling resistor RS2. The second control module U2 can compare the obtained current value of the second battery cell B2 with a preset overcurrent threshold. When the current threshold of the second battery cell B2 is greater than the preset overcurrent threshold, it indicates that the second battery cell B2 is overcurrent, and the power parameters of the second battery cell B2 meet the preset conditions. At this time, the second control module U2 outputs a corresponding control signal through the charging switch control terminal CHG to disconnect the charging switch tubes in the third switch element M3 and the fourth switch element M4, and / or outputs a corresponding control signal through the discharging switch control terminal DSG to disconnect the discharging switch tubes in the third switch element M3 and the fourth switch element M4, thereby disconnecting the electrical connection between the negative terminal of the cell module 11 and the connection terminal P-, and realizing the protection function of the cell module 11 based on single cell overcurrent detection.

[0049] The power supply terminals VDD of the first control module U1 and the second control module U2 are respectively electrically connected to the positive terminals of the first battery cell B1 and the second battery cell B2 through the first voltage divider resistor R1 and the second voltage divider resistor R2.

[0050] Based on this, the protection module 12 can also acquire the voltage across each cell and is configured to disconnect the electrical connection between the cell module 11 and the connection terminal P- when the voltage across any cell is greater than a preset overvoltage threshold or less than a preset undervoltage threshold. Specifically, the first control module U1 can acquire the voltage across the first cell B1 through the voltage between its power supply terminal VDD and ground terminal GND. The first control module U1 can compare the acquired voltage across the first cell B1 with the preset overvoltage threshold and undervoltage threshold. When the voltage across the first cell B1 is greater than the preset overvoltage threshold or less than the preset undervoltage threshold, it indicates that the first cell B1 is overvoltage or undervoltage. At this time, the first control module U1 outputs a corresponding control signal through the charging switch control terminal CHG to disconnect the charging switch tubes in the first switching element M1 and the second switching element M2, and / or outputs a corresponding control signal through the discharging switch control terminal DSG to disconnect the discharging switch tubes in the first switching element M1 and the second switching element M2, thereby disconnecting the electrical connection between the negative terminal of the cell module 11 and the connection terminal P-, and realizing the protection function of the cell module 11 based on single cell overvoltage or undervoltage detection.

[0051] Similarly, the second control module U2 can obtain the voltage across the second cell B2 through the voltage between its power supply terminal VDD and ground terminal GND. The second control module U2 can compare the obtained voltage across the second cell B2 with preset overvoltage and undervoltage thresholds. When the voltage across the second cell B2 is greater than the preset overvoltage threshold or less than the preset undervoltage threshold, it indicates that the second cell B2 is over-voltage or under-voltage. At this time, the second control module U2 outputs a corresponding control signal through the charging switch control terminal CHG to disconnect the charging switch transistors in the third switch element M3 and the fourth switch element M4, and / or outputs a corresponding control signal through the discharging switch control terminal DSG to disconnect the discharging switch transistors in the third switch element M3 and the fourth switch element M4, thereby disconnecting the electrical connection between the negative terminal of the cell module 11 and the connection terminal P-, realizing the protection function of the cell module 11 based on single-cell overvoltage or undervoltage detection.

[0052] In some embodiments, referring to FIG4, in battery 101, both the first control module U1 and the second control module U2 further include a voltage detection terminal VM. The voltage detection terminal VM of the first control module U1 is electrically connected to the first switch module Q1 and the second switch module Q2 through a third voltage divider resistor R3. The voltage detection terminal VM of the second control module U2 is electrically connected to the second switch module Q2 and the connection terminal P- through a fourth voltage divider resistor R4. The first voltage divider resistor R1 to the fourth voltage divider resistor R4 have the functions of current limiting and voltage dividing.

[0053] In some embodiments, referring to FIG4, in battery 101, the power supply terminal VDD of the first control module U1 is electrically connected to the ground terminal GND via a first capacitor C1 and a second capacitor C2 connected in series. The power supply terminal VDD of the second control module U2 is electrically connected to the ground terminal GND via a third capacitor C3 and a fourth capacitor C4 connected in series. The ground terminal GND of the first control module U1 is electrically connected to the current detection terminal VI via a fifth capacitor C5. The ground terminal GND of the second control module U2 is electrically connected to the current detection terminal VI via a sixth capacitor C6. The two ends of the first switch module Q1 are electrically connected via a seventh capacitor C7 and an eighth capacitor C8 connected in series. The two ends of the second switch module Q2 are electrically connected via a ninth capacitor C9 and a tenth capacitor C10 connected in series. The first capacitor C1 to the tenth capacitor C10 serve isolation and filtering functions.

[0054] In some embodiments, the battery 101 further includes test point TP1 and test point TP2, which are configured to connect to an external testing device. The external testing device can obtain the power parameters of the cell module 11, the conduction status of the first switch module Q1 and the second switch module Q2, etc., through test point TP1 and test point TP2, so as to realize the production testing and quality management of the battery 101.

[0055] In some embodiments, referring to FIG4, battery 101 further includes an electrostatic discharge (ESD) protection circuit 14. The ESD protection circuit 14 may include multiple capacitors connected in series, such as an eleventh capacitor C11 and a twelfth capacitor C12, thereby absorbing or discharging static electricity to prevent the protection module 12 from being interfered with or damaged by static electricity.

[0056] In some embodiments, the battery 101 further includes a connector J1. The two ends of the connector J1 are electrically connected to the two connection terminals P+ and P- of the battery 101, respectively. The connector J1 can be connected to an external device, such as a terminal device, so that the battery 101 can supply power to the external device.

[0057] Please refer to Figure 5, which is a circuit diagram of a battery 102 provided in an embodiment of this application. The battery 10 in Figures 1 to 3 can be the battery 102 provided in this embodiment. The difference between the battery 102 provided in this embodiment and the battery 101 in Figure 4 is that: in battery 102, both the first control module U1 and the second control module U2 include a current detection terminal CS, a positive voltage terminal V+, and a switch control terminal. Both the first switch module Q1 and the second switch module Q2 include a charging switch transistor and a discharging switch transistor. Correspondingly, to realize the on / off control of the first switch module Q1 and the second switch module Q2, the switch control terminals of both the first control module U1 and the second control module U2 include a charging switch control terminal CO and a discharging switch control terminal DO. The charging switch control terminal CO of the first control module U1 is electrically connected to the control terminal of the charging switch transistor in the first switch module Q1. The discharging switch control terminal DO of the first control module U1 is electrically connected to the control terminal of the discharging switch transistor in the first switch module Q1. The charging switch control terminal CO of the second control module U2 is electrically connected to the control terminal of the charging switch transistor in the second switch module Q2. The discharge switch control terminal DO of the second control module U2 is electrically connected to the control terminal of the discharge switch tube in the second switch module Q2.

[0058] In some embodiments, the first switch module Q1 and the second switch module Q2 may include a greater number of switching transistors, and the multiple switching transistors may be connected in parallel to form a redundant design to improve the reliability of the first switch module Q1 and the second switch module Q2.

[0059] Furthermore, in battery 102, the positive terminal of cell module 11, the first switch module Q1, the second switch module Q2, and the connection terminal P+ are connected in series. This provides positive terminal protection for cell module 11.

[0060] The first terminal V of the first sampling resistor RS1 is electrically connected to the positive terminal of the battery cell module 11 and the positive voltage terminal V+ of the first control module U1. The second terminal S1 of the first sampling resistor RS1 is electrically connected to the positive terminal of the first battery cell B1 and the current detection terminal CS of the first control module U1. The first terminal V of the second sampling resistor RS2 is electrically connected to the positive terminal of the battery cell module 11 and the positive voltage terminal V+ of the second control module U2. The second terminal S2 of the second sampling resistor RS2 is electrically connected to the positive terminal of the second battery cell B2 and the current detection terminal CS of the second control module U2.

[0061] Based on this, the first control module U1 can obtain the power parameters of the first battery cell B1 through the first sampling resistor RS1, and determine whether the power parameters of the first battery cell B1 meet the preset conditions, thereby controlling the on / off state of the first switch module Q1. Specifically, the first control module U1 can obtain the voltage of the first sampling resistor RS1 based on the voltage between its current detection terminal CS and the positive voltage terminal V+, and then obtain the current value flowing through the first sampling resistor RS1, that is, the current value of the first battery cell B1, based on the resistance value of the first sampling resistor RS1. The first control module U1 can compare the obtained current value of the first battery cell B1 with a preset overcurrent threshold. When the current threshold of the first battery cell B1 is greater than the preset overcurrent threshold, it indicates that the first battery cell B1 is overcurrent, and the power parameters of the first battery cell B1 meet the preset conditions. At this time, the first control module U1 outputs a corresponding control signal through the charging switch control terminal CO to disconnect the charging switch tube in the first switch module Q1, and / or outputs a corresponding control signal through the discharging switch control terminal DO to disconnect the discharging switch tube in the first switch module Q1, thereby disconnecting the electrical connection between the positive terminal of the cell module 11 and the connection terminal P+, and realizing the protection function of the cell module 11 based on single cell overcurrent detection.

[0062] Similarly, the second control module U2 can obtain the power parameters of the second battery cell B2 through the second sampling resistor RS2, and determine whether the power parameters of the second battery cell B2 meet the preset conditions, thereby controlling the on / off state of the second switch module Q2. Specifically, the second control module U2 can obtain the voltage of the second sampling resistor RS2 based on the voltage between its current detection terminal CS and the positive voltage terminal V+, and then obtain the current value flowing through the second sampling resistor RS2, that is, the current value of the second battery cell B2, based on the resistance value of the second sampling resistor RS2. The second control module U2 can compare the obtained current value of the second battery cell B2 with a preset overcurrent threshold. When the current threshold of the second battery cell B2 is greater than the preset overcurrent threshold, it indicates that the second battery cell B2 is overcurrent, and the power parameters of the second battery cell B2 meet the preset conditions. At this time, the second control module U2 outputs a corresponding control signal through the charging switch control terminal CO to disconnect the charging switch tube in the second switch module Q2, and / or outputs a corresponding control signal through the discharging switch control terminal DO to disconnect the discharging switch tube in the second switch module Q2, thereby disconnecting the electrical connection between the positive terminal of the cell module 11 and the connection terminal P+, and realizing the protection function of the cell module 11 based on single cell overcurrent detection.

[0063] In some embodiments, referring to FIG5, in battery 102, both the first control module U1 and the second control module U2 further include a cell negative terminal VSS and a power supply terminal VDD. The cell negative terminals VSS of both the first control module U1 and the second control module U2 are electrically connected to the negative terminals of the first cell B1 and the second cell B2. The power supply terminal VDD of the first control module U1 is electrically connected to one end of the first switch module Q1 through the fifth voltage divider resistor R5, and is electrically connected to the negative terminals of the first cell B1 and the second cell B2 through the thirteenth capacitor C13. The power supply terminal VDD of the second control module U2 is electrically connected to the other end of the first switch module Q1 and one end of the second switch module Q2 through the sixth voltage divider resistor R6, and is electrically connected to the negative terminals of the first cell B1 and the second cell B2 through the fourteenth capacitor C14. The connection terminal P+ and the connection terminal P- are electrically connected through the fifteenth capacitor C15 and the sixteenth capacitor C16 connected in series. The discharge switch control terminal DO of the first control module U1 is electrically connected to the discharge switch transistor in the first switch module Q1 through the seventh voltage divider resistor R7. The discharge switch control terminal DO of the second control module U2 is electrically connected to the discharge switch transistor in the second switch module Q2 through the eighth voltage divider resistor R8. The current detection terminal CS of the first control module U1 is electrically connected to the positive voltage terminal V+ through the seventeenth capacitor C17. The current detection terminal CS of the first control module U1 is also electrically connected to the second terminal S1 of the first sampling resistor RS1 through the ninth voltage divider resistor R9. The positive voltage terminal V+ of the first control module U1 is also electrically connected to the first terminal V of the first sampling resistor RS1 through the tenth voltage divider resistor R10. The current detection terminal CS of the second control module U2 is electrically connected to the positive voltage terminal V+ through the eighteenth capacitor C18. The current detection terminal CS of the second control module U2 is also electrically connected to the second terminal S2 of the second sampling resistor RS2 through the eleventh voltage divider resistor R11. The positive voltage terminal V+ of the second control module U2 is also electrically connected to the first terminal V of the second sampling resistor RS2 through the twelfth voltage divider resistor R12. The two ends of the first switch module Q1 are electrically connected through the nineteenth capacitor C19. The two ends of the second switch module Q2 are electrically connected through the twentieth capacitor C20. Among them, the fifth voltage divider resistor R5 to the twelfth voltage divider resistor R12 have the functions of current limiting and voltage division. The seventh capacitor C7 to the twentieth capacitor C20 have the functions of isolation and filtering.

[0064] Therefore, the batteries 10, 101, and 102 provided in this application can collect the power parameters of each parallel cell through sampling resistors connected in series with multiple parallel cells. This allows for accurate and reliable protection of the cell module 11 based on the power parameters of each individual cell, thereby improving the battery's safety performance.

[0065] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A battery, characterized in that, include: The connector is configured to connect to external devices. A battery cell module, comprising at least two battery cell groups, each battery cell group comprising a battery cell connected in series and a sampling resistor, wherein at least two battery cell groups are connected in parallel; a protection module, electrically connected between the battery cell module and the connection terminal, configured to acquire the power parameters of each battery cell respectively through the sampling resistor, and configured to disconnect the electrical connection between the battery cell module and the connection terminal when the power parameters of any battery cell meet a preset condition.

2. The battery as described in claim 1, characterized in that, The battery module includes a first battery module group and a second battery module group, the first battery module group includes a first battery module, the second battery module group includes a second battery module, and the protection module includes a first protection module and a second protection module. The first protection module is configured to acquire the power parameters of the first battery cell, and is configured to disconnect the electrical connection between the battery cell module and the connection terminal when the power parameters of the first battery cell meet the preset conditions. The second protection module is configured to acquire the power parameters of the second battery cell and to disconnect the electrical connection between the battery cell module and the connection terminal when the power parameters of the second battery cell meet the preset conditions.

3. The battery as described in claim 2, characterized in that, The first protection module includes a first control module and a first switching element, and the second protection module includes a second control module and a second switching element. Both the first switching element and the second switching element are electrically connected between the cell module and the connection terminal. The first control module is electrically connected to the first switching element. The first control module is configured to acquire the power parameters of the first cell and is configured to control the first switching element to disconnect when the power parameters of the first cell meet the preset conditions, thereby cutting off the electrical connection between the cell module and the connection terminal. The second control module is electrically connected to the second switching element. The second control module is configured to acquire the power parameters of the second battery cell and is configured to control the second switching element to disconnect when the power parameters of the second battery cell meet the preset conditions, so as to cut off the electrical connection between the battery cell module and the connection terminal.

4. The battery as described in claim 3, characterized in that, The power parameters include current, and the protection module is configured to acquire the voltage across each of the sampling resistors in order to acquire the current of the battery cell connected in series with each sampling resistor.

5. The battery as described in claim 4, characterized in that, The preset conditions include the current of the battery cell being greater than a preset overcurrent threshold.

6. The battery as described in claim 4 or 5, characterized in that, The first cell group includes a first sampling resistor connected in series with the first cell. The second cell group includes a second sampling resistor connected in series with the second cell. Both the first and second control modules include a current detection terminal and a ground terminal. The cell module includes a positive terminal and a negative terminal. The first terminal of the first sampling resistor is electrically connected to the negative terminal of the first cell and the ground terminal of the first control module. The second terminal of the first sampling resistor is electrically connected to the current detection terminal of the first control module and the negative terminal of the cell module. The first terminal of the second sampling resistor is electrically connected to the negative terminal of the second cell and the ground terminal of the second control module. The second terminal of the second sampling resistor is electrically connected to the current detection terminal of the second control module and the negative terminal of the cell module.

7. The battery as described in claim 6, characterized in that, The negative terminal of the battery cell module, the first switching element, and the second switching element are connected in series.

8. The battery as described in claim 4 or 5, characterized in that, The first cell group includes a first sampling resistor connected in series with the first cell. The second cell group includes a second sampling resistor connected in series with the second cell. Both the first and second control modules include a current detection terminal and a positive voltage terminal. The cell module includes a positive terminal and a negative terminal. The first terminal of the first sampling resistor is electrically connected to the positive terminal of the cell module and the positive voltage terminal of the first control module. The second terminal of the first sampling resistor is electrically connected to the positive terminal of the first cell and the current detection terminal of the first control module. The first terminal of the second sampling resistor is electrically connected to the positive terminal of the cell module and the positive voltage terminal of the second control module. The second terminal of the second sampling resistor is electrically connected to the positive terminal of the second cell and the current detection terminal of the second control module.

9. The battery as claimed in claim 8, characterized in that, The positive terminal of the battery cell module, the first switching element, and the second switching element are connected in series in sequence.

10. The battery as claimed in claim 3, characterized in that, The power parameters include voltage, and the preset conditions include the cell voltage being greater than a preset overvoltage threshold or less than a preset undervoltage threshold.

11. The battery as claimed in claim 10, characterized in that, Both the first control module and the second control module include a power supply terminal and a ground terminal; the positive terminal of the first battery cell is electrically connected to the power supply terminal of the first control module, and the negative terminal of the first battery cell is electrically connected to the ground terminal of the first control module; the positive terminal of the second battery cell is electrically connected to the power supply terminal of the second control module, and the negative terminal of the second battery cell is electrically connected to the ground terminal of the second control module.

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