Battery control circuit and electronic device

Abstract

The utility model provides a battery control circuit and electronic equipment, and belongs to the technical field of electronics. The circuit comprises a plurality of battery units, a plurality of first switch units and a processing unit, the first end of the first battery unit in the battery units is respectively connected with the positive electrode of the external equipment, the first end of the first first switch unit in the first switch units and the acquisition end of the processing unit, and the second end of the first battery unit is connected with the second end of the first first switch unit; the first end of the Nth battery unit in the battery units is connected with the third end and the fourth end of the (N-1) th first switch unit in the first switch units, and the second end of the Nth battery unit is connected with the first end of the Nth first switch unit in the first switch units. According to the invention, each battery unit can be completely discharged and / or charged, so that the overall capacity of each battery unit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to a battery control circuit and an electronic device. BACKGROUND

[0002] With the rapid development of electronic technology, more and more small electronic products have entered people's work and life, bringing great convenience to people. Generally, these electronic products need to use energy storage devices such as lithium batteries for power supply.

[0003] In related technologies, relevant technical personnel often set up to connect each battery cell in series through a diode, and then package the multiple battery cells in series into a lithium battery or other energy storage device. When the lithium battery or other energy storage device needs to be charged or discharged externally, the positive and negative electrodes of the lithium battery can be respectively connected to the positive and negative electrodes of the external device, so that each battery cell in the lithium battery can be discharged or charged at the same time.

[0004] However, if one or more battery cells have a large capacity loss, this solution may cause other normal battery cells to be unable to fully discharge or charge, thereby causing the overall capacity of the battery to decrease. UTILITY MODEL CONTENT

[0005] The purpose of the present application is to provide a battery control circuit and an electronic device, which can achieve the effect of fully discharging and / or completing charging of each battery cell, thereby improving the overall capacity of each battery cell.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a battery control circuit, which comprises: a plurality of battery cells, a plurality of first switch units, and a processing unit.

[0008] A first end of a first battery cell in each battery cell is connected to a positive electrode of an external device, a first end of a first first switch unit in each first switch unit, and a collection end of the processing unit, respectively; and a second end of the first battery cell is connected to a second end of the first first switch unit.

[0009] A first end of an Nth battery cell in each battery cell is connected to a third end and a fourth end of an (N-1)th first switch unit in each first switch unit, respectively; and a second end of the Nth battery cell is connected to a first end of an Nth first switch unit in each first switch unit; wherein N is greater than or equal to 2.

[0010] The second end of an Nth first switch unit in each of the first switch units is further connected with the fourth end of an N-1th first switch unit, and the control end of each of the first switch units is connected with each first control end of the processing unit respectively; and the last first switch unit in each of the first switch units is further used for connecting the negative pole of the external device.

[0011] The plurality of first switch units are used for being turned on or turned off under the control of the processing unit, and the output loop of an Mth battery unit in the plurality of battery units is disconnected when an Mth first switch unit in the plurality of first switch units is turned off; wherein M is greater than or equal to 1.

[0012] The processing unit is used for detecting the voltage value of the plurality of battery units, and controlling the corresponding first switch unit to act based on the voltage value; wherein an Mth battery unit in the plurality of battery units corresponds to an Mth first switch unit in the plurality of first switch units.

[0013] Optionally, each of the first switch units comprises a second switch unit and a third switch unit.

[0014] The first end of an Mth second switch unit is connected with the second end of an Mth battery unit, the second end of the Mth second switch unit is connected with the first end of an M+1th battery unit, and the third end of the Mth second switch unit and the first end of an Mth third switch unit are both used for connecting the corresponding first control end of the processing unit.

[0015] The second end of an Mth third switch unit is connected with the third end of an M-1th third switch unit, and the third end of the Mth third switch unit is connected with the second end of an M+1th third switch unit.

[0016] The second end of a first third switch unit in each of the third switch units is used for connecting the positive pole of the external device, and the third end of a last third switch unit in each of the third switch units is used for connecting the negative pole of the external device.

[0017] When the second switch unit is turned on, the third switch unit is turned off; and when the second switch unit is turned off, the third switch unit is turned on.

[0018] Optionally, the second switch unit comprises a first switch tube.

[0019] Optionally, the second switch unit further comprises a second switch tube.

[0020] The second switch tube and the first switch tube are connected in series.

[0021] Optionally, the third switch unit comprises a third switch tube.

[0022] Optionally, the battery control circuit further comprises a sampling resistor.

[0023] The first end and the second end of the sampling resistor are connected with the first sampling end and the second sampling end of the processing unit respectively; the sampling resistor is used for collecting the current transmitted between each battery unit and an external device and sending to the processing unit.

[0024] Optionally, the battery control circuit further comprises a fourth switch tube.

[0025] The first pole of the fourth switch tube is connected with the second control end of the processing unit, the second pole of the fourth switch tube is connected with the first end of the first battery unit, and the third pole of the fourth switch tube is connected with the positive pole of the external device.

[0026] The fourth switch tube is used for being turned on or turned off under the control of the processing unit.

[0027] Optionally, the battery control circuit further comprises a fifth switch tube.

[0028] The first pole of the fifth switch tube is connected with the third control end of the processing unit, the second pole of the fifth switch tube is connected with the third pole of the fourth switch tube, and the third pole of the fifth switch tube is connected with the positive pole of the external device.

[0029] The fifth switch tube is used for being turned on or turned off under the control of the processing unit.

[0030] In a second aspect, an electronic device is provided, and the electronic device comprises any battery control circuit according to the first aspect.

[0031] Optionally, the electronic device further comprises an external device.

[0032] The external device is connected with the battery control circuit.

[0033] The battery control circuit is used for at least discharging to the external device.

[0034] The beneficial effects of the embodiments of the present application include:

[0035] The battery control circuit provided by the embodiment of the present application comprises a plurality of battery units, a plurality of first switch units and a processing unit. The first end of a first battery unit in each battery unit is connected with the positive pole of the external device, the first end of a first first switch unit in each first switch unit and the collection end of the processing unit respectively. The second end of the first battery unit is connected with the second end of the first first switch unit.

[0036] The first end of an Nth battery unit in each battery unit is connected with the third end and the fourth end of an (N-1)th first switch unit in each first switch unit. The second end of the Nth battery unit is connected with the first end of an Nth first switch unit in each first switch unit. The second end of the Nth first switch unit in each first switch unit is also connected with the fourth end of the (N-1)th first switch unit. The control end of each first switch unit is connected with each first control end of the processing unit respectively. The last first switch unit in each first switch unit is also used for connecting the negative pole of the external device.

[0037] Since the voltage value of each battery unit can indicate the loss degree of each voltage unit, the battery control circuit can detect the voltage value of each battery unit by the processing unit, determine whether there is a battery unit with large capacity loss in each battery unit, and then short-circuit or shield the battery unit with large capacity loss by controlling the action of the first switch unit corresponding to the battery unit with large capacity loss when the discharge degree of the battery unit with large capacity loss is large or the battery unit with large capacity loss cannot continue to discharge. In this way, other battery units in each battery unit can continue to discharge externally, and the overall discharge degree of each battery unit can be improved.

[0038] In this way, each battery unit can be fully discharged and / or charged, and the overall capacity of each battery unit can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 The structural schematic diagram of the first battery control circuit provided by the embodiment of the present application;

[0041] Figure 2 The structural schematic diagram of the second battery control circuit provided by the embodiment of the present application;

[0042] Figure 3 A third battery control circuit structure diagram provided by an embodiment of the present application is shown in FIG. 3.

[0043] Figure 4 A fourth battery control circuit structure diagram provided by an embodiment of the present application is shown in FIG. 4. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts are within the scope of protection of the present application.

[0046] It should be noted that similar reference numerals and letters in the following drawings represent similar items, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0047] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the related art, the related person often sets up a lithium battery or other energy storage device by connecting each battery cell in series through a diode, and then packaging the plurality of battery cells in series. When the lithium battery or other energy storage device needs to be charged or discharged externally, the positive and negative electrodes of the lithium battery can be connected to the positive and negative electrodes of the external device, so that each battery cell in the lithium battery can be discharged or charged at the same time.

[0050] However, if one or more battery cells in the battery have a large capacity loss, this solution may cause other normal battery cells to be unable to fully discharge or charge, thereby causing the overall capacity of the battery to decrease.

[0051] Therefore, the battery control circuit provided by the embodiments of the present application is provided. By setting a plurality of battery units, a plurality of first switch units, and a processing unit in the battery control circuit, the first end of the first battery unit in each battery unit is connected to the positive electrode of the external device, the first end of the first first switch unit in each first switch unit, and the collection end of the processing unit, respectively. The second end of the first battery unit is connected to the second end of the first first switch unit; the first end of the Nth battery unit in each battery unit is connected to the third end and the fourth end of the N-1th first switch unit in each first switch unit, respectively; the second end of the Nth battery unit is connected to the first end of the Nth first switch unit in each first switch unit; wherein N is greater than or equal to 2; the second end of the Nth first switch unit in each first switch unit is also connected to the fourth end of the N-1th first switch unit, and the control end of each first switch unit is connected to each first control end of the processing unit; the last first switch unit in each first switch unit is also used to connect the negative electrode of the external device. In this way, each battery unit can be fully discharged and / or charged, thereby improving the overall capacity of each battery unit.

[0052] The embodiments of the present application take the battery control circuit applied in the electronic device as an example for illustration. However, it does not mean that the embodiments of the present application can only be applied to the control of the battery in the electronic device.

[0053] The battery control circuit provided by the embodiments of the present application will be explained and described in detail below.

[0054] Figure 1 The structure diagram of the battery control circuit provided by the present application is shown in FIG. 1. Referring to FIG. 1, the embodiments of the present application provide a battery control circuit, which includes a plurality of battery units 101, a plurality of first switch units 102, and a processing unit 103. Figure 1 The embodiments of the present application provide a battery control circuit, which includes a plurality of battery units 101, a plurality of first switch units 102, and a processing unit 103.

[0055] The first end of a first one of the battery units 101 is connected to a positive electrode of the external device, a first end of a first one of the first switch units 102, and a collection terminal of the processing unit 103, respectively, and the second end of the first battery unit is connected to a second end of the first one of the first switch units 102.

[0056] The first end of an Nth one of the battery units 101 is connected to a third end and a fourth end of an N-1th one of the first switch units 102, and the second end of the Nth battery unit is connected to a first end of an Nth one of the first switch units 102.

[0057] The second end of the Nth one of the first switch units 102 is also connected to the fourth end of the N-1th one of the first switch units 102, and the control terminal of each of the first switch units 102 is connected to a first control terminal of the processing unit 103. A last one of the first switch units 102 is also used to connect a negative electrode of the external device.

[0058] The plurality of first switch units 102 are used to be turned on or turned off under the control of the processing unit 103, and the output loop of an Mth one of the battery units 101 is disconnected when the Mth one of the first switch units 102 is turned off.

[0059] In this embodiment, disconnecting the output loop of the Mth one of the battery units 101 can specifically mean that the Mth one of the battery units is disconnected from adjacent other battery units and / or the Mth one of the battery units is short-circuited, which is not limited in the embodiment of the application.

[0060] Optionally, the processing unit 103 is used to detect a voltage value of each of the battery units 101, and control the corresponding first switch unit to act based on the voltage value.

[0061] Optionally, each of the battery units 101 can be a battery cell packaged in the same battery pack. Each of the battery units 101 can be any kind of battery such as a lithium battery, a lead-acid battery, etc., which is not limited in the embodiment of the application.

[0062] Optionally, the external device can be any possible power load, in which case each of the battery units 101 can discharge to the external device. The external device can also be any possible charging device, in which case the external device can charge each of the battery units 101.

[0063] Optionally, N is greater than or equal to 2, and M is greater than or equal to 1.

[0064] Optionally, each of the first switch units 102 can include any switch device capable of being turned on or turned off.

[0065] In this embodiment, see continue to refer to Figure 1 The first battery cell in each battery cell 101 can refer to Figure 1 A battery cell 101 connected to an external device X (located in Figure 1 The topmost battery unit 101). The last first switch unit in each first switch unit 102 refers to... Figure 1 A first switch unit 102 (located in) is connected to an external device X. Figure 1 The bottommost first switch unit 102).

[0066] Normally, when each first switch unit 102 is in its initial or default state, any two adjacent battery units 101 can be connected in series via the first switch unit 102 located between these two adjacent battery units 101. After each first switch unit 102 is activated, any two adjacent battery units 101 are disconnected by the first switch unit 102 located between these two adjacent battery units 101, and the battery unit 101 corresponding to this first switch unit 102 is short-circuited. In this way, the short-circuited battery unit 101 can be shielded.

[0067] It is worth noting that the shielding (or short-circuiting) relationship between each first switch unit 102 and each battery unit 101 is one-to-one. Generally, the Mth battery unit 101 in the plurality of battery units 101 corresponds to the Mth first switch unit 102 in the plurality of first switch units 102. That is to say, the Mth first switch unit 102 is used to shield the Mth battery unit 101.

[0068] For example, see [link to previous article] Figure 1 , Figure 1 The topmost first switch unit 102 can be used for shielding. Figure 1 The topmost battery unit 101, Figure 1 The first switch unit 102 in the middle can be used for shielding. Figure 1 The middle battery unit 101, Figure 1 The bottommost first switch unit 102 can be used for shielding. Figure 2 The bottommost battery unit is 101.

[0069] Optionally, the processing unit 103 can be any device with detection, processing, and control functions, such as a BMS, MCU, or any other possible device. This application embodiment does not limit this.

[0070] Optionally, the voltage value can be used to indicate the discharge degree of the battery cell 101. Generally, the greater the discharge degree of the battery cell 101, the smaller the voltage value of the battery cell 101. For example, when the battery cell 101 is completely discharged, the voltage value of the battery cell 101 can be 0.

[0071] Specifically, during the discharging process, the processing unit 103 can detect the voltage value of each battery cell 101 in real time, and compare the voltage value of each battery cell 101 with the pre-set voltage threshold.

[0072] If the processing unit 103 detects that the voltage values of all battery cells 101 decrease to the voltage threshold at the same time (or within the allowable error range), no action is taken. If the processing unit 103 detects that the voltage value of one or more battery cells 101 decreases to the voltage threshold, but there are still other battery cells 101 whose voltage values are greater than the voltage threshold (i.e., not all battery cells 101 decrease to the voltage threshold), in this case, the processing unit 103 can control the first switch unit 102 corresponding to the one or more battery cells 101 to act, so as to shield the one or more battery cells 101 whose voltage values decrease to the voltage threshold. In this way, it can be ensured that other battery cells 101 in the battery control circuit can be fully discharged.

[0073] The voltage threshold can be set according to actual needs, and generally, the voltage threshold can be set to 0. However, since some battery cells 101 can have over-discharge protection mechanism, so that these battery cells 101 cannot be completely discharged, in this case, the voltage of these battery cells 101 when stopping discharging can be greater than 0, therefore, the voltage threshold can also be set to the voltage level when the battery cell 101 stops discharging. The embodiments of the present application do not limit this.

[0074] It can be understood that, because each battery cell 101 is simultaneously discharged to the outside in the default state, and generally, the discharge amount of each battery cell 101 in series is basically the same within the same time. Therefore, if the voltage value of one or more battery cells 101 decreases to the voltage threshold in advance, it can be determined that the battery capacity of the one or more battery cells 101 is lower (i.e., the capacity loss degree is greater) than the battery capacity of other battery cells 101 whose voltage value does not decrease to the voltage threshold.

[0075] In one possible way, the processing unit 103 can also detect the voltage value of each battery unit 101 in real time during the charging process, and when the voltage value of one or more battery units 101 rises to a preset charging threshold (i.e., not all battery units 101 rise to the charging threshold), the processing unit 103 can control the first switch unit 102 corresponding to the one or more battery units 101 with the voltage value greater than or equal to the charging threshold to act, so as to shield the one or more battery units 101 with the voltage value rising to the charging threshold. In this way, it can be ensured that other battery units 101 in the battery control circuit can be fully charged.

[0076] In addition, it can also be determined whether shielding is needed by detecting the charge amount and other parameters of the battery unit 101 during the charging process, which is not limited in the embodiments of the present application.

[0077] In another possible way, the processing unit 103 can also detect the voltage between each battery unit 101 in real time during the discharging process, and determine the voltage difference between any two battery units 101. When it is determined that the voltage difference between a certain battery unit 101 and other battery units 101 during the discharging process exceeds a preset threshold (such as 300 mV), it can be determined that this battery unit 101 is in an unhealthy state, and the first switch unit 102 corresponding to the one or more battery units 101 in the unhealthy state can be controlled to act.

[0078] Further, the corresponding first switch unit 102 can be controlled to act to shield the battery unit 101 in the unhealthy state and with the voltage value less than the above-mentioned voltage threshold.

[0079] It is worth noting that since there are multiple battery units 101 in the battery control circuit, if the capacity of one or more battery units 101 (not all battery units 101) in these battery units 101 is greatly reduced, it can cause the other normal or less reduced battery units 101 to also be unable to continue discharging externally because the one or more battery units 101 with greater loss are completely discharged or unable to be discharged, that is, the overall capacity of each battery unit 101 can be reduced.

[0080] It should be noted that the battery control circuit provided in the embodiment can detect the voltage values of the battery units 101 through the processing unit 103, determine whether there is a battery unit 101 with large capacity loss in the battery units 101, and then short-circuit or shield the battery units 101 with large capacity loss by controlling the first switch units 102 corresponding to the battery units 101 with large capacity loss when the battery units 101 with large capacity loss have large discharge degree or cannot continue to discharge. In this way, other battery units 101 in the battery units 101 can continue to discharge externally, and the degree of discharge of the battery units 101 as a whole can be improved.

[0081] In the embodiment of the application, a plurality of battery units 101, a plurality of first switch units 102, and a processing unit 103 are arranged in the battery control circuit. The first end of a first battery unit in the battery units 101 is connected to the positive electrode of the external device, the first end of a first first switch unit in the first switch units 102, and the collection end of the processing unit 103 respectively, and the second end of the first battery unit is connected to the second end of the first first switch unit.

[0082] The first end of an Nth battery unit in the battery units 101 is connected to the third end and the fourth end of an (N-1)th first switch unit in the first switch units 102 respectively, and the second end of the Nth battery unit is connected to the first end of an Nth first switch unit in the first switch units 102. The second end of the Nth first switch unit in the first switch units 102 is also connected to the fourth end of the (N-1)th first switch unit, and the control end of each first switch unit 102 is connected to each first control end of the processing unit 103 respectively. The last first switch unit in the first switch units 102 is also used to connect the negative electrode of the external device.

[0083] In the embodiment of the application, a plurality of battery units 101, a plurality of first switch units 102, and a processing unit 103 are arranged in the battery control circuit. The first end of a first battery unit in the battery units 101 is connected to the positive electrode of the external device, the first end of a first first switch unit in the first switch units 102, and the collection end of the processing unit 103 respectively, and the second end of the first battery unit is connected to the second end of the first first switch unit.

[0084] In this way, the effect of completely discharging and / or completing charging of each battery cell and improving the overall capacity of each battery cell can be achieved.

[0085] In a possible implementation, referring to Figure 2 Each first switch unit 102 includes a second switch unit 1021 and a third switch unit 1022.

[0086] The first end of the Mth second switch unit 1021 is connected to the second end of the Mth battery cell, the second end of the Mth second switch unit 1021 is connected to the first end of the M+1th battery cell, and the third end of the Mth second switch unit 1021 and the first end of the Mth third switch unit 1022 are both used to connect the corresponding first control end of the processing unit 103.

[0087] The second end of the Mth third switch unit 1022 is connected to the third end of the M-1th third switch unit 1022, and the third end of the Mth third switch unit 1022 is connected to the second end of the M+1th third switch unit 1022.

[0088] The second end of the first third switch unit 1022 among the third switch units 1022 is used to connect the positive electrode of the external device, and the third end of the last third switch unit 1022 among the third switch units 1022 is used to connect the negative electrode of the external device.

[0089] The second switch unit 1021 is turned on when the third switch unit 1022 is turned off, and the second switch unit 1021 is turned off when the third switch unit 1022 is turned on. In addition, M is greater than or equal to 1.

[0090] Optionally, the Mth second switch unit 1021 and the Mth third switch unit 1022 can respectively refer to the second switch unit 1021 and the third switch unit 1022 in the Mth first switch unit 102.

[0091] Similarly, the first third switch unit 1022 among the third switch units 1022 can refer to the third switch unit 1022 of the first first switch unit 102 among the first switch units 102. The last third switch unit 1022 among the third switch units 1022 can refer to the third switch unit 1022 of the last first switch unit 102 among the first switch units 102.

[0092] Exemplarily, the first end of the Mth second switch unit 1021 is connected to the second end of the Mth battery cell, the second end of the Mth second switch unit 1021 is connected to the first end of the M+1th battery cell, and the third end of the Mth second switch unit 1021 and the first end of the Mth third switch unit 1022 are both used to connect the corresponding first control end of the processing unit 103. Figure 2For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load. Figure 2 For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load.

[0093] For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load. Figure 2 For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load. Figure 3 For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load.

[0094] As can be seen from the above, the short circuit or shielding of the other two battery units 101 is similar to the above examples, and the embodiments of the present application will not be described here.

[0095] In this way, one or more battery units 101 can be accurately and reliably shielded or short circuited.

[0096] In a possible implementation, referring to Figure 3 The second switch unit 1021 includes a first switch tube Q1.

[0097] Optionally, the first switch tube Q1 can be an NMOS tube or an N-channel IGBT, and the embodiments of the present application are not limited in this regard.

[0098] For example, the first switch unit 102 at the top of the middle row is taken as an example. If the first switch unit 102 is in the initial state or the default state, the second switch unit 1021 in the first switch unit 102 can be in the on state, and the third switch unit 1022 in the first switch unit 102 can be in the off state. In this way, in the initial state or the default state, the first switch unit 102 can connect the battery unit 101 at the top of the middle row and the battery unit 101 at the bottom of the middle row to the external load. Figure 3 As can be seen from the specific structure of the battery control circuit shown in

[0099] It is worth noting that the specific connection relationship of each first switch tube Q1 can be seen from Figure 3As shown. Specifically, the first switch tube Q1 in the second switch unit 1021 can be controlled to be turned off to achieve the purpose of controlling the second switch unit 1021 to be turned off; the first switch tube Q1 in the second switch unit 1021 can be controlled to be turned on to achieve the purpose of controlling the second switch unit 1021 to be turned on.

[0100] In a possible manner, continuing to refer to Figure 3 The second switch unit 1021 can further include a second switch tube Q2.

[0101] The second switch tube Q2 is connected in series with the first switch tube Q1.

[0102] Optionally, the second switch tube Q2 can also be an NMOS tube or an N-channel IGBT or the like, and the embodiments of the present application do not limit this.

[0103] Exemplarily, the connection direction of the second switch tube Q2 is opposite, that is, the drain of the first switch tube Q1 and the drain of the second switch tube Q2 are connected, and specifically from Figure 3 As shown in the specific structure of the battery control circuit, the source of the first switch tube Q1 in the Mth first switch unit 102 can be connected with the second end of the Mth battery unit 101, the drain of the first switch tube Q1 in the Mth first switch unit 102 can be connected with the drain of the second switch tube Q2 in the Mth first switch unit 102, the source of the second switch tube Q2 in the Mth first switch unit 102 is connected with the first end of the M+1th battery unit 101, and the gate of the first switch tube Q1 and the gate of the second switch tube Q2 in the Mth first switch unit 102 can be connected with one control end of the processing unit 103.

[0104] It is worth noting that because there are body diodes on the switch tubes, by connecting the drain of the first switch tube Q1 and the drain of the second switch tube Q2 in the same first switch unit 102, the problem that after the corresponding battery unit 101 is short-circuited or shielded by the first switch unit 102, the battery unit 101 can still be charged and discharged through the body diode of the first switch tube Q1 or the second switch tube Q2 can be avoided, and thus the effect of the battery control circuit can be avoided. In this way, the safety of the circuit can also be improved.

[0105] In a possible implementation manner, continuing to refer to Figure 3 The third switch unit 1022 includes a third switch tube Q3.

[0106] Optionally, the third switch tube Q3 can be a PMOS tube or other P-channel switch tube, and the embodiments of the present application do not limit this.

[0107] Exemplarily, from Figure 4The specific structure of the battery control circuit shown can be seen that the source of the third switch tube Q3 in the Mth first switch unit 102 can be connected with the first end of the Mth battery unit 101, the drain of the third switch tube Q3 in the Mth first switch unit 102 can be connected with the first end of the M+1th battery unit 101, and the gate of the third switch tube Q3 in the Mth first switch unit 102 can be connected with one control end of the processing unit 103.

[0108] It is worth noting that the specific connection relationship of each third switch tube Q3 can be seen Figure 4 Specifically, the third switch tube Q3 in the third switch unit 1022 can be controlled to be turned off to achieve the purpose of controlling the third switch unit 1022 to be turned off, and the third switch tube Q3 in the third switch unit 1022 can be controlled to be turned on to achieve the purpose of controlling the third switch unit 1022 to be turned on.

[0109] In a possible implementation manner, referring to Figure 4 The battery control circuit further includes a sampling resistor R0.

[0110] The first end and the second end of the sampling resistor R0 are respectively connected with the first sampling end and the second sampling end of the processing unit 103.

[0111] Optionally, the sampling resistor R0 can be a high-precision sampling resistor or any other possible resistor.

[0112] Optionally, the sampling resistor R0 is used to collect the current (i.e., bus current) transmitted between each battery unit 101 and the external device and send to the processing unit 103.

[0113] Further, the processing unit 103 can identify, detect, and determine the real-time parameters of the battery control circuit based on the current of the sampling resistor R0, and then determine whether the battery control circuit appears abnormal conditions, such as whether under-voltage, over-current, or any other possible conditions appear.

[0114] In a possible implementation manner, continuing to refer to ​ The battery control circuit further includes a fourth switch tube Q4.

[0115] The first pole of the fourth switch tube Q4 is connected with the second control end of the processing unit 103, the second pole of the fourth switch tube Q4 is connected with the first end of the first battery unit 101, and the third pole of the fourth switch tube Q4 is connected with the positive pole of the external device.

[0116] The fourth switch tube Q4 is used to be turned on or turned off under the control of the processing unit 103.

[0117] Optionally, the fourth switch Q4 can be an NMOS or other N-channel switch, and the embodiments of the present application do not limit this.

[0118] Exemplarily, the fourth switch Q4 can be a charging protection switch. During charging of the battery cells 101, if the processing unit 103 determines that overcurrent or overvoltage occurs by detecting the voltage of the sampling resistor R0, the processing unit 103 can output a corresponding control signal to the fourth switch Q4 to make the fourth switch Q4 off, so as to cut off the charging line of the external device to the battery cells 101. The embodiments of the present application do not limit this.

[0119] It is worth noting that, since the body diode of the fourth switch Q4 has the characteristic of unidirectional conduction, after the fourth switch Q4 is off, the energy output by the external device can be prevented from flowing to the battery cells 101 through the body diode of the fourth switch Q4.

[0120] In a possible implementation manner, continuing to refer to ​ The battery control circuit further includes a fifth switch Q5.

[0121] The first pole of the fifth switch Q5 is connected with the third control end of the processing unit 103, the second pole of the fifth switch Q5 is connected with the third pole of the fourth switch Q4, and the third pole of the fifth switch Q5 is connected with the positive pole of the external device.

[0122] The fifth switch Q5 is used to be turned on or off under the control of the processing unit 103.

[0123] Optionally, the fifth switch Q5 can be an NMOS or other N-channel switch, and the embodiments of the present application do not limit this.

[0124] Exemplarily, the fifth switch Q5 can be a discharging protection switch. During discharging of the battery cells 101, if the processing unit 103 determines that overcurrent or overvoltage occurs by detecting the voltage of the sampling resistor R0, the processing unit 103 can output a corresponding control signal to the fifth switch Q5 to make the fifth switch Q5 off, so as to cut off the discharging line of the battery cells 101 to the external device. The embodiments of the present application do not limit this.

[0125] It is worth noting that, since the body diode of the fifth switch Q5 has the characteristic of unidirectional conduction, after the fifth switch Q5 is off, the problem that the battery cells 101 still discharge to the external device through the body diode of the fifth switch Q5 can be prevented.

[0126] In addition, when an abnormal condition such as overvoltage or overcurrent occurs, the fifth switch tube Q5 and the fourth switch tube Q4 can be turned off at the same time. Since the drain of the fifth switch tube Q5 is connected to the drain of the fourth switch tube Q4, the problem that the battery unit 101 can still be charged and discharged through the body diode of the fifth switch tube Q5 and the fourth switch tube Q4 when an abnormal condition such as overvoltage or overcurrent occurs in the circuit can be avoided. In this way, the safety of the circuit can be improved.

[0127] It should be noted that in each of the embodiments provided in the present application, the battery control circuit is taken as an example of having three battery units 101 and three first switch units 102, but this does not mean that the battery control circuit provided in the embodiments of the present application can only have three battery units 101. The battery unit 101 can have two or more than two battery units and first switch units, and the embodiments of the present application do not limit this.

[0128] The following describes an electronic device including the battery control circuit provided in the present application. For specific implementation processes and technical effects, refer to the above description, and the following will not be repeated.

[0129] The embodiments of the present application also provide an electronic device, which includes the battery control circuit provided in any of the above embodiments.

[0130] Optionally, the electronic device further includes an external device, and the external device is connected to the battery control circuit.

[0131] The battery control circuit is at least used to discharge the external device.

[0132] In a possible case, the external device can also output electric energy to the battery control circuit, thereby charging each battery unit in the battery control circuit.

[0133] Optionally, the external device can be any possible power load or any possible charging device, and the embodiments of the present application do not limit this.

[0134] The electronic device described above includes the battery control circuit provided in the above embodiments, and both belong to the same design concept, and have similar implementation principles and technical effects, which will not be repeated here.

[0135] The above is merely specific implementation manners of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0136] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery control circuit, characterized by comprising: The battery control circuit comprises a plurality of battery units, a plurality of first switch units, a processing unit; a first end of a first battery unit in each of the battery units is connected with a positive electrode of an external device, a first end of a first first switch unit in each of the first switch units, and a collection end of the processing unit, respectively; a second end of the first battery unit is connected with a second end of the first first switch unit; a first end of an Nth battery unit in each of the battery units is connected with a third end and a fourth end of an N-1th first switch unit in each of the first switch units, respectively; a second end of the Nth battery unit is connected with a first end of an Nth first switch unit in each of the first switch units; wherein N is greater than or equal to 2; a second end of the Nth first switch unit in each of the first switch units is also connected with the fourth end of the N-1th first switch unit; and control ends of each of the first switch units are connected with each first control end of the processing unit, respectively; a last first switch unit in each of the first switch units is also used for connecting a negative electrode of the external device; wherein the plurality of first switch units are used for being turned on or turned off under the control of the processing unit, and an output loop of an Mth battery unit in the plurality of battery units is disconnected when an Mth first switch unit in the plurality of first switch units is turned off; wherein M is greater than or equal to 1; the processing unit is used for detecting voltage values of the plurality of battery units, and controlling corresponding first switch units to act based on the voltage values; wherein an Mth battery unit in the plurality of battery units corresponds to an Mth first switch unit in the plurality of first switch units.

2. The battery control circuit of claim 1, wherein, each of the first switch units comprises a second switch unit and a third switch unit; a first end of an Mth second switch unit is connected with a second end of an Mth battery unit; a second end of the Mth second switch unit is connected with a first end of an M+1th battery unit; a third end of the Mth second switch unit and a first end of an Mth third switch unit are used for connecting a corresponding first control end of the processing unit; a second end of an Mth third switch unit is connected with a third end of an M-1th third switch unit; a third end of the Mth third switch unit is connected with a second end of an M+1th third switch unit; wherein M is greater than or equal to 1; a second end of a first third switch unit in the third switch units is used for connecting a positive electrode of the external device; a third end of a last third switch unit in the third switch units is used for connecting a negative electrode of the external device; wherein the second switch unit is turned on, and the third switch unit is turned off; the second switch unit is turned off, and the third switch unit is turned on.

3. The battery control circuit of claim 2, wherein, The second switch unit comprises a first switch tube.

4. The battery control circuit of claim 3, wherein, The second switch unit further comprises a second switch tube; the second switch tube is connected with the first switch tube in series.

5. The battery control circuit of claim 2, wherein, The third switch unit comprises a third switch tube.

6. The battery control circuit of claim 1, wherein, The battery control circuit further comprises a sampling resistor; The first end and the second end of the sampling resistor are connected with the first sampling end and the second sampling end of the processing unit respectively; the sampling resistor is used for collecting the current between each battery unit and an external device.

7. The battery control circuit of claim 6, wherein, The battery control circuit further comprises a fourth switch tube. The first pole of the fourth switch tube is connected with the second control end of the processing unit, the second pole of the fourth switch tube is connected with the first end of the first battery unit, and the third pole of the fourth switch tube is connected with the positive pole of the external device. The fourth switch tube is used for being turned on or turned off under the control of the processing unit.

8. The battery control circuit of claim 7, wherein, The battery control circuit further comprises a fifth switch tube. The first pole of the fifth switch tube is connected with the third control end of the processing unit, the second pole of the fifth switch tube is connected with the third pole of the fourth switch tube, and the third pole of the fifth switch tube is connected with the positive pole of the external device. The fifth switch tube is used for being turned on or turned off under the control of the processing unit.

9. An electronic device, comprising: The electronic device comprises the battery control circuit according to any one of claims 1 to 8.

10. The electronic device of claim 9, wherein, The electronic device further comprises an external device. The external device is connected with the battery control circuit. The battery control circuit is used at least for discharging to the external device.

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