Battery

Abstract

The invention 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 current of each battery cell through a sampling resistor, and is configured to cut off the electric connection between the battery cell module and the connecting end when the current 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 current of the single battery cell, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular, to a multi-cell parallel battery. Background Art

[0002] The multi-cell parallel battery includes a cell module and a protection circuit. The cell module includes 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 a single cell and cut off the main circuit power supply in time. Summary of the invention

[0003] In view of the above problems, the present application provides a battery, comprising: a connection terminal, configured to connect an external device. A battery cell module, the battery cell module includes at least two battery cell groups, each battery cell group includes battery cells and sampling resistors connected in series, and at least two battery cell groups are connected in parallel. A protection module, electrically connected between the battery cell module and the connection terminal, and arranged on the main circuit, is configured to obtain the current of each battery cell respectively through the sampling resistor, and is configured to cut off the electrical connection between the battery cell module and the connection terminal when the current of any battery cell meets a preset condition.

[0004] In a possible implementation, the battery cell 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 obtain the current of the first battery cell, and is configured to cut off the electrical connection between the battery cell module and the connection end when the current of the first battery cell meets a preset condition. The second protection module is configured to obtain the current of the second battery cell, and is configured to cut off the electrical connection between the battery cell module and the connection end when the current of the second battery cell meets a preset condition.

[0005] In a possible implementation, the first protection module includes a first control module and a first switch element, and the second protection module includes a second control module and a second switch element, and the first switch element and the second switch element are both electrically connected between the battery cell module and the connection end. The first control module is electrically connected to the first switch element, and the first control module is configured to obtain the current of the first battery cell, and is configured to control the first switch element to be disconnected when the current of the first battery cell meets a preset condition, so as to cut off the electrical connection between the battery cell module and the connection end. The second control module is electrically connected to the second switch element, and the second control module is configured to obtain the current of the second battery cell, and is configured to control the second switch element to be disconnected when the current of the second battery cell meets a preset condition, so as to cut off the electrical connection between the battery cell module and the connection end.

[0006] In a possible implementation, the protection module is configured to obtain the voltage across each sampling resistor to obtain the current of the battery cell connected in series corresponding to each sampling resistor.

[0007] In a possible implementation, the preset condition includes that the current of the battery cell is greater than a preset overcurrent threshold.

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

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

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

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

[0012] In one possible implementation, the protection module is configured to obtain the voltage across each battery cell, and is configured to cut off the electrical connection between the battery cell module and the connection end when the voltage across any battery cell is greater than a preset overvoltage threshold or less than a preset undervoltage threshold.

[0013] In a possible implementation, the first control module and the second control module both include a power supply terminal and a ground terminal. The positive pole of the first battery cell is electrically connected to the power supply terminal of the first control module, and the negative pole of the first battery cell is electrically connected to the ground terminal of the first control module. The first control module obtains the voltage between the two ends of the first battery cell according to the voltage between the power supply terminal and the ground terminal. The positive pole of the second battery cell is electrically connected to the power supply terminal of the second control module, and the negative pole of the second battery cell is electrically connected to the ground terminal of the second control module. The second control module obtains the voltage between the two ends of the second battery cell according to the voltage between the power supply terminal and the ground terminal.

[0014] Therefore, the battery provided by the present application can collect the current of each parallel battery cell through sampling resistors respectively connected in series to multiple parallel battery cells, and then can accurately and reliably protect the battery module according to the current of a single battery cell, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a battery provided in accordance with an embodiment of the present application.

[0016] Figure 2 A schematic diagram of a battery cell module and a protection module provided in one embodiment of the present application.

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

[0018] Figure 4 A circuit diagram of a battery provided in accordance with an embodiment of the present application.

[0019] Figure 5 A circuit diagram of a battery provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application.

[0021] It is understandable that the connection relationship described in this application refers to direct or indirect connection. For example, the connection between A and B can be either 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 and C can be directly connected, and C and B can be directly connected, so that A and B are connected through C. It is also understandable that the "A connects 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 specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0023] In the description of this application, words such as "first" and "second" are only configured to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit them to be different. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0024] See also Figure 1 , Figure 1 A schematic diagram of a battery 10 provided in accordance with an embodiment of the present 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 electric device. The charging device, such as a charger, is configured to charge the cell module 11 through the connection terminal 13. The electric device, such as a load device, a terminal device, etc., is configured to receive power from the cell module 11 through the connection terminal 13.

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

[0027] The cell module 11 includes at least two cells or cell groups, and multiple cells or multiple cell groups are connected in parallel to each other, thereby forming a multi-cell parallel cell module 11. In this way, the multi-cell parallel cell module 11 can increase the capacity of the battery 10, extend the discharge time of the battery 10, and at the same time enhance the current output capacity of the battery 10, reduce the load of a single cell, and improve the reliability and stability of the battery 10.

[0028] The protection module 12 is electrically connected to the cell module 11. And the protection module 12 is electrically connected between the cell module 11 and the connection terminal 13. The protection module 12 is configured to detect the power parameters of each cell, and when the power parameters of any cell meet the preset conditions, cut off the electrical connection between the cell module 11 and the connection terminal 13, that is, cut off the main circuit. Among them, the power parameters may include voltage, current, output power, temperature, state of charge (Status Of Charge, SOC), state of health (Status Of Health, SOH), etc. Meeting the preset conditions may include that the power parameters of the cell exceed the preset normal range. For example, the voltage of the cell is greater than the preset overvoltage threshold, that is, the cell is overvoltage. For another example, the voltage of the cell is less than the preset undervoltage threshold, that is, the cell is undervoltage. For another example, the temperature of the cell is greater than the preset overtemperature threshold, that is, the cell is overheated. For another example, the current of the cell is greater than the preset overcurrent threshold, that is, the cell is overcurrent. In this way, the protection module 12 can detect the current parameters of a single battery cell and protect the battery cell module 11 when the power parameters of any battery cell meet the preset conditions. This can reduce the safety risks of battery 10 such as flatulence, bulging, and fire caused by bias current due to inconsistent internal resistance of multiple battery cells, and improve the reliability of battery 10 protection.

[0029] Specifically, see Figure 2 , Figure 2 A schematic diagram of a cell module 11 and a protection module 12 provided in an embodiment of the present application. Here, the cell module 11 includes a first cell group and a second cell group, the first cell group includes a first cell B1, the second cell group includes a second cell B2, and the protection module 12 includes a first protection module 121 and a second protection module 122. However, the present application does not further limit the number of cells included in the cell module 11 and the number of protection modules 12, and only requires that the number of cells included in the cell module 11 and the number of protection modules 12 are at least two.

[0030] The first battery cell group and the second battery cell group are connected in parallel, wherein the first ends of the first battery cell B1 and the second battery cell B2 are 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 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 and is configured to obtain power parameters of the first battery cell B1 and to cut off 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 a preset condition.

[0032] The second protection module 122 is connected to the second battery cell B2 and is configured to obtain power parameters of the second battery cell B2 and to cut off 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 a preset condition.

[0033] In the embodiment of the present application, the number of protection modules is equal to the number of battery cells, and each protection module correspondingly obtains the power parameters of each battery cell.

[0034] In this way, the protection module 12 can be connected to each battery cell respectively, so as to obtain the power parameters of each battery cell, and independently turn on or off the circuit between the battery cell module 11 and the connection terminal 13, that is, the electrical connection of the main circuit, according to whether the power parameters of each battery cell meet the preset conditions, thereby achieving 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 end of the first battery cell B1 and the second battery cell B2 may be a positive terminal. The second end of the first battery cell B1 and the second battery cell B2 may be a negative terminal. The first end of the battery cell module 11 may be a positive terminal. The second end of the battery cell module 11 may be a negative terminal. Alternatively, the first end of the first battery cell B1 and the second battery cell B2 may be a negative terminal. The second end of the first battery cell B1 and the second battery cell B2 may be a positive terminal. The first end of the battery cell module 11 may be a negative terminal. The second end of the battery cell module 11 may be a positive terminal. In this way, the protection module 12 may be connected to the positive terminal of the battery cell module 11, or may be connected to the negative terminal of the battery cell module 11, so that the positive terminal protection or the negative terminal protection of the battery cell module 11 can be achieved, and the application scenarios are wide and the compatibility is good.

[0036] See also Figure 3 , Figure 3 A schematic diagram of a first protection module 121 and a second protection module 122 provided in an embodiment of the present 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 obtain 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 obtain 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] In this way, since the cell module 11, the first switch module Q1, the second switch module Q2, and the connection end 13 are connected in series in sequence, when any one of the first switch module Q1 and the second switch module Q2 is disconnected, the electrical connection between the cell module 11 and the connection end 13 will be disconnected, thereby disconnecting the main circuit and stopping the charging and discharging of the cell module 11. In other words, when the power parameter of any cell in the cell module 11 exceeds the preset normal range, the electrical connection between the cell module 11 and the connection end 13 will be disconnected, thereby improving the protection accuracy and reliability of the battery 10 and reducing the potential safety hazards of the battery 10.

[0040] In some embodiments, the locations of the first switch module Q1 and the second switch module Q2 can be interchanged. The present application does not impose any limitation on the connection sequence of the multiple switch modules connected in series between the battery cell module 11 and the connection end 13 .

[0041] See also Figure 4 , Figure 4 This is a circuit diagram of a battery 101 provided in an embodiment of the present application. Figures 1 to 3 The battery 10 in the embodiment may be the battery 101 provided in the present embodiment. In the battery 101, the connection terminal 13 includes a connection terminal P+ and a connection terminal P-. The first control module U1 and the second control module U2 both include a current detection terminal VI, a ground terminal GND, a switch control terminal and a power supply terminal VDD. The first switch module Q1 and the second switch module Q2 both include at least one switch element. Here, the first switch module Q1 includes a first switch element M1 and a second switch element M2, and the second switch module Q2 includes a third switch element M3 and a fourth switch element M4. However, the present application does not impose any limitation on the number of switch elements included in the first control module U1 and the second control module U2, the switch type and the connection relationship therebetween.

[0042] The first switch element M1 to the fourth switch element M4 each include at least one switch. The at least one switch may be a semiconductor switch, such as a MOS tube, a triode, etc., or may be a relay, a mechanically controlled switch, etc. Here, the first switch element M1 to the fourth switch element M4 each include a charging switch tube and a discharging switch tube, wherein the charging switch tube and the discharging switch tube are both NMOS tubes as an example for explanation, but the application does not impose any restrictions on the number of switches included in the first switch element M1 to the fourth switch element M4, the switch type, and the connection relationship therebetween. Correspondingly, in order to realize the on-off control of the first switch module Q1 and the second switch module Q2, the switch control terminals of the first control module U1 and the second control module U2 each include a charging switch control terminal CHG and a discharging switch control terminal DSG.

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

[0044] In addition, in the battery 101, the negative terminal of the cell module 11, the first switch module Q1, the second switch module Q2, and the connection terminal P- are sequentially connected in series. In this way, the first switch module Q1 and the second switch module Q2 are connected in series to form a redundant design, which reduces the probability of protection failure due to the failure of the first switch module Q1 or the second switch module Q2, and can also achieve negative terminal protection of the cell module 11.

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

[0046] The first end VSS1 of the first sampling resistor RS1 is electrically connected to the negative electrode of the first battery cell B1 and the ground terminal GND of the first control module U1, and the second end 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 end of the battery cell module 11. The first end VSS2 of the second sampling resistor RS2 is electrically connected to the negative electrode of the second battery cell B2 and the ground terminal GND of the second control module U2, and the second end 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 end 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, and then control the on and off of the first switch module Q1. Specifically, the first control module U1 can obtain the voltage of the first sampling resistor RS1 according to 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 according to the resistance value of the first sampling resistor RS1, that is, the current value of the first battery cell B1. The first control module U1 can compare the obtained current value of the first battery cell B1 with the preset overcurrent threshold. When the current threshold of the first battery cell B1 is greater than the preset overcurrent threshold, it means 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 switch element M1 and the second switch 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 switch element M1 and the second switch element M2, thereby disconnecting the electrical connection between the negative electrode of the battery cell module 11 and the connection terminal P-, thereby realizing the battery cell module 11 protection function 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 and off of the second switch module Q2. Specifically, the second control module U2 can obtain the voltage of the second sampling resistor RS2 according to 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 according to the resistance value of the second sampling resistor RS2, that is, the current value of the second battery cell B2. The second control module U2 can compare the obtained current value of the second battery cell B2 with the preset overcurrent threshold. When the current threshold of the second battery cell B2 is greater than the preset overcurrent threshold, it means 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 electrode of the battery cell module 11 and the connection terminal P-, thereby realizing the battery cell module 11 protection function based on single battery cell overcurrent detection.

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

[0050] Based on this, the protection module 12 can also obtain the voltage across each battery cell, and is configured to cut off the electrical connection between the battery cell module 11 and the connection terminal P- when the voltage across any battery cell is greater than a preset overvoltage threshold, or less than a preset undervoltage threshold. Specifically, the first control module U1 can obtain the voltage across the first battery cell B1 through the voltage between its power supply terminal VDD and the ground terminal GND. The first control module U1 can compare the obtained voltage across the first battery cell B1 with the preset overvoltage threshold and undervoltage threshold. When the voltage across the first battery cell B1 is greater than the preset overvoltage threshold, or less than the preset undervoltage threshold, it means that the first battery 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 switch element M1 and the second switch 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 switch element M1 and the second switch element M2, thereby disconnecting the electrical connection between the negative electrode of the battery cell module 11 and the connection terminal P-, thereby realizing the battery cell module 11 protection function based on single battery cell overvoltage or undervoltage detection.

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

[0052] In some embodiments, see Figure 4 In the battery 101, the first control module U1 and the second control module U2 also 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 the third voltage-dividing 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 the fourth voltage-dividing resistor R4. Among them, the first voltage-dividing resistor R1 to the fourth voltage-dividing resistor R4 have the functions of current limiting and voltage dividing.

[0053] In some embodiments, see Figure 4 In the battery 101, the power supply terminal VDD and the ground terminal GND of the first control module U1 are electrically connected through the first capacitor C1 and the second capacitor C2 connected in series. The power supply terminal VDD and the ground terminal GND of the second control module U2 are electrically connected through the third capacitor C3 and the fourth capacitor C4 connected in series. The ground terminal GND of the first control module U1 and the current detection terminal VI are electrically connected through the fifth capacitor C5. The ground terminal GND of the second control module U2 and the current detection terminal VI are electrically connected through the sixth capacitor C6. The two ends of the first switch module Q1 are electrically connected through the seventh capacitor C7 and the eighth capacitor C8 connected in series. The two ends of the second switch module Q2 are electrically connected through the ninth capacitor C9 and the tenth capacitor C10 connected in series. Among them, the first capacitor C1 to the tenth capacitor C10 have the functions of isolation and filtering.

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

[0055] In some embodiments, see Figure 4 The battery 101 further includes an anti-electrostatic discharge (ESD) circuit 14. The anti-ESD circuit 14 may include a plurality of capacitors connected in series, for example, an eleventh capacitor C11 and a twelfth capacitor C12, so as to absorb or discharge static electricity and prevent the protection module 12 from being disturbed or damaged by static electricity.

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

[0057] See also Figure 5 , Figure 5 This is a circuit diagram of a battery 102 provided in an embodiment of the present application. Figures 1 to 3 The battery 10 in the embodiment may be the battery 102 provided in this embodiment. The battery 102 provided in this embodiment and Figure 4 The difference between the battery 101 in the embodiment is that: in the battery 102, the first control module U1 and the second control module U2 both include a current detection terminal CS, a positive voltage terminal V+ and a switch control terminal. The first switch module Q1 and the second switch module Q2 both include a charging switch tube and a discharging switch tube. Correspondingly, in order to realize the on-off control of the first switch module Q1 and the second switch module Q2, the switch control terminals of the first control module U1 and the second control module U2 both 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 tube 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 tube 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 tube in the second switch module Q2. The discharging switch control terminal DO of the second control module U2 is electrically connected to the control terminal of the discharging 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 switch tubes, and the plurality of switch tubes 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] In addition, in the battery 102 , the positive terminal of the cell module 11 , the first switch module Q1 , the second switch module Q2 , and the connection terminal P+ are sequentially connected in series, so that the positive terminal protection of the cell module 11 can be achieved.

[0060] The first end V of the first sampling resistor RS1 is electrically connected to the positive terminal of the battery module 11 and the positive voltage terminal V+ of the first control module U1, and the second end S1 of the first sampling resistor RS1 is electrically connected to the positive electrode of the first battery cell B1 and the current detection terminal CS of the first control module U1. The first end V of the second sampling resistor RS2 is electrically connected to the positive terminal of the battery module 11 and the positive voltage terminal V+ of the second control module U2, and the second end S2 of the second sampling resistor RS2 is electrically connected to the positive electrode 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, and then control the on and off of the first switch module Q1. Specifically, the first control module U1 can obtain the voltage of the first sampling resistor RS1 according to 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 according to the resistance value of the first sampling resistor RS1, that is, the current value of the first battery cell B1. The first control module U1 can compare the obtained current value of the first battery cell B1 with the preset overcurrent threshold. When the current threshold of the first battery cell B1 is greater than the preset overcurrent threshold, it means 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 electrode of the battery cell module 11 and the connection terminal P+, thereby realizing the battery cell module 11 protection function based on single battery 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 and off 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 based on the resistance value of the second sampling resistor RS2, that is, the current value of the second battery cell B2. The second control module U2 can compare the obtained current value of the second battery cell B2 with the preset overcurrent threshold. When the current threshold of the second battery cell B2 is greater than the preset overcurrent threshold, it means 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 pole of the battery cell module 11 and the connection terminal P+, thereby realizing the battery cell module 11 protection function based on single battery cell overcurrent detection.

[0063] In some embodiments, see Figure 5In the battery 102, the first control module U1 and the second control module U2 also include a cell negative terminal VSS and a power supply terminal VDD. The cell negative terminals VSS of the first control module U1 and the second control module U2 are both electrically connected to the negative electrodes 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-dividing resistor R5, and is electrically connected to the negative electrodes 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-dividing resistor R6, and is electrically connected to the negative electrodes 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 tube in the first switch module Q1 through the seventh voltage-dividing resistor R7. The discharge switch control terminal DO of the second control module U2 is electrically connected to the discharge switch tube in the second switch module Q2 through the eighth voltage-dividing 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 end S1 of the first sampling resistor RS1 through the ninth voltage-dividing resistor R9. The positive voltage terminal V+ of the first control module U1 is also electrically connected to the first end V of the first sampling resistor RS1 through the tenth voltage-dividing 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 end S2 of the second sampling resistor RS2 through the eleventh voltage-dividing resistor R11. The positive voltage terminal V+ of the second control module U2 is also electrically connected to the first end V of the second sampling resistor RS2 through the twelfth voltage-dividing 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. The fifth voltage-dividing resistor R5 to the twelfth voltage-dividing resistor R12 have the functions of current limiting and voltage dividing, and the seventh capacitor C7 to the twentieth capacitor C20 have the functions of isolation and filtering.

[0064] Therefore, the battery 10, battery 101, and battery 102 provided in the present application can collect the power parameters of each parallel battery cell through sampling resistors respectively connected in series to multiple parallel battery cells, and then accurately and reliably protect the battery module 11 according to the power parameters of a single battery cell, thereby improving the safety performance of the battery.

[0065] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A battery, characterized in that: include: A connection terminal configured to connect to an external device; A cell module, comprising at least two cell groups, each of which comprises a cell and a sampling resistor connected in series, and at least two of which are connected in parallel; The protection module is electrically connected between the battery cell module and the connection end, and is configured to obtain the current of each of the battery cells respectively through the sampling resistor, and is configured to cut off the electrical connection between the battery cell module and the connection end when the current of any of the battery cells meets a preset condition.

2. The battery according to claim 1, characterized in that The battery cell 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, and the protection module includes a first protection module and a second protection module; The first protection module is configured to obtain the current of the first battery cell, and is configured to cut off the electrical connection between the battery cell module and the connection end when the current of the first battery cell meets the preset condition; The second protection module is configured to obtain the current of the second battery cell, and is configured to cut off the electrical connection between the battery cell module and the connection end when the current of the second battery cell meets the preset condition.

3. The battery according to claim 2, characterized in that The first protection module includes a first control module and a first switch element, the second protection module includes a second control module and a second switch element, and the first switch element and the second switch element are both electrically connected between the battery cell module and the connection end; The first control module is electrically connected to the first switch element, and the first control module is configured to obtain the current of the first battery cell, and is configured to control the first switch element to be disconnected when the current of the first battery cell meets the preset condition, so as to cut off the electrical connection between the battery cell module and the connection end; The second control module is electrically connected to the second switch element. The second control module is configured to obtain the current of the second battery cell and to control the second switch element to disconnect when the current of the second battery cell meets the preset condition, so as to cut off the electrical connection between the battery cell module and the connection end.

4. The battery according to claim 3, characterized in that The protection module is configured to obtain the voltage across each of the sampling resistors to obtain the current of the battery cells connected in series corresponding to each of the sampling resistors.

5. The battery according to claim 4, characterized in that The preset condition includes that the current of the battery cell is greater than a preset overcurrent threshold.

6. The battery according to claim 4 or 5, characterized in that The first battery cell group includes a first sampling resistor, which is connected in series to the first battery cell; the second battery cell group includes a second sampling resistor, which is connected in series to the second battery cell; the first control module and the second control module both include a current detection terminal and a ground terminal; and the battery cell module includes a positive terminal and a negative terminal; The first end of the first sampling resistor is electrically connected to the negative electrode of the first battery cell and the ground end of the first control module, and the second end of the first sampling resistor is electrically connected to the current detection end of the first control module and the negative end of the battery cell module; The first end of the second sampling resistor is electrically connected to the negative electrode of the second battery cell and the ground end of the second control module, and the second end of the second sampling resistor is electrically connected to the current detection end of the second control module and the negative end of the battery cell module.

7. The battery according to claim 6, characterized in that The negative terminal of the battery cell module, the first switch element, and the second switch element are connected in series in sequence.

8. The battery according to claim 4 or 5, characterized in that The first battery cell group includes a first sampling resistor, which is connected in series to the first battery cell; the second battery cell group includes a second sampling resistor, which is connected in series to the second battery cell; the first control module and the second control module both include a current detection terminal and a positive voltage terminal; and the battery cell module includes a positive terminal and a negative terminal; The first end of the first sampling resistor is electrically connected to the positive terminal of the battery cell module and the positive voltage terminal of the first control module, and the second end of the first sampling resistor is electrically connected to the positive electrode of the first battery cell and the current detection terminal of the first control module; The first end of the second sampling resistor is electrically connected to the positive terminal of the battery cell module and the positive voltage terminal of the second control module, and the second end of the second sampling resistor is electrically connected to the positive electrode of the second battery cell and the current detection terminal of the second control module.

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

10. The battery according to claim 3, characterized in that The protection module is configured to obtain the voltage across each of the battery cells, and is configured to cut off the electrical connection between the battery cell module and the connection end when the voltage across any of the battery cells is greater than a preset overvoltage threshold or less than a preset undervoltage threshold.

11. The battery according to claim 10, characterized in that The first control module and the second control module both include a power supply terminal and a ground terminal; The positive electrode of the first battery cell is electrically connected to the power supply end of the first control module, and the negative electrode of the first battery cell is electrically connected to the ground end of the first control module. The first control module obtains the voltage between the two ends of the first battery cell according to the voltage between the power supply end and the ground end; The positive pole of the second battery cell is electrically connected to the power supply end of the second control module, and the negative pole of the second battery cell is electrically connected to the ground end of the second control module. The second control module obtains the voltage across the second battery cell based on the voltage between the power supply end and the ground end.

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