Battery control circuit, battery and electronic device

Abstract

A battery control circuit, a battery, and an electronic device are disclosed. The battery control circuit includes a first connection terminal, a second connection terminal, and a circuit protection module. The first connection terminal includes a positive electrode, a first negative electrode, and a second negative electrode. The second connection terminal includes a first positive electrode terminal, a first negative electrode terminal, a second positive electrode terminal, and a second negative electrode terminal. The circuit protection module includes a first switch unit, a second switch unit, and a control unit. The first switch unit is connected between the positive electrode and the first positive electrode terminal. The second switch unit is connected between the positive electrode and the second positive electrode terminal. The control unit controls the on / off of the first switch unit and the second switch unit.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on January 30, 2022, bearing application number 202220250819.3 and titled "Battery Control Circuit, Charging Protection Device, Battery and Electronic Device", and a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on May 10, 2022, bearing application number 202221113226.9 and titled "Battery Control Circuit, Charging Protection Device, Battery and Electronic Device", the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of batteries, and in particular to battery control circuits, batteries and electronic devices. [Background technology]

[0003] With the rapid development of battery fast charging technology, the requirements for batteries in high-power charging are becoming higher and higher. In high-current charging, it is required to keep the temperature rise of the battery as low as possible, which is a big challenge for the design of a charging protection device.

[0004] The conventional fast charging design takes advantage of the three-tab battery core to effectively shorten the high-current charging path in the charging protection device, thereby lowering impedance and reducing heat generation. The specific implementation method is to connect two flexible printed circuits (FPCs) to the mobile phone system end of the charging protection device, and connect each of the positive poles of the two FPCs to the positive nickel plate of the charging protection device via the shortest path, and connect each of the negative poles of the two FPCs to a switch MOS and then to the negative nickel plate of the charging protection device to form a charging and discharging circuit.

[0005] In batteries currently being developed, the metal housing of the battery core has negative polarity, and the electronics chamber (i.e., the area in which the battery is mounted) is connected to the ground of the electronics system, and since the system ground has negative polarity, the electronics chamber itself also has negative polarity. For safety reasons, the metal housing needs to use a fully insulated method, that is, the thickness of the battery core needs to be increased, thereby reducing the capacity of the battery core. Summary of the Invention [Problem to be solved by the invention]

[0006] The present application aims to solve at least one of the technical problems in the prior art.

[0007] In order to solve the above technical problems, the present application employs the following technical means. [Means for solving the problem]

[0008] A battery control circuit according to a first aspect of the present application includes a first connection terminal, a second connection terminal, and a circuit protection module. The first connection terminal is connected to a battery core of a battery and includes a positive electrode, a first negative electrode, and a second negative electrode. The second connection terminal is connected to an external device of the battery and includes a first positive electrode terminal, a first negative electrode terminal, a second positive electrode terminal, and a second negative electrode terminal. The circuit protection module includes a first switch unit, a second switch unit, and a control unit. The first switch unit is connected between the positive electrode and the first positive electrode terminal. The positive electrode, the first switch unit, and the first positive electrode terminal are connected, and the first negative electrode terminal and the first negative electrode are connected to form a first conductive path. The second switch unit is connected between the positive electrode and the second positive electrode terminal. The positive electrode, the second switch unit, and the second positive electrode terminal are connected, and the second negative electrode terminal and the second negative electrode are connected to form a second conductive path. The control unit controls the on / off of the first switch unit and the second switch unit.

[0009] In one embodiment, the voltage difference between the voltage output from the control unit and the voltage of the positive electrode is 4V or more.

[0010] In one embodiment, the circuit protection module further includes a current sampling unit, which is connected in series between the first positive terminal and the positive electrode, and is further connected in series between the second positive terminal and the positive electrode, and the control unit controls the on / off of the first switch unit and the second switch unit based on the sampled current value of the current sampling unit.

[0011] In one embodiment, the first switch unit includes a first switch, the first switch being connected in series between the first positive terminal and the positive electrode, the second switch unit includes a second switch, the second switch being connected in series between the second positive terminal and the positive electrode, the control unit includes a first controller, the first controller being connected to the first switch, the second switch, and the current sampling unit respectively to form a first protection circuit, and the first protection circuit controls the on / off of the first switch and the second switch based on the sampled current value of the current sampling unit.

[0012] In one embodiment, the first protection circuit further includes a first voltage sampling resistor and a second voltage sampling resistor, and the first controller samples a first voltage value between the first negative electrode and the positive electrode by the first voltage sampling resistor, and samples a second voltage value between the positive electrode and the second negative electrode by the second voltage sampling resistor to obtain a first voltage average value of the first voltage value and the second voltage value.

[0013] In one embodiment, the first controller obtains a sampled current value of the current sampling unit, and controls the first switch and the second switch to be off when at least one of the sampled current value and the first voltage average value exceeds a corresponding protection threshold.

[0014] In one embodiment, the first switch unit includes a third switch, the third switch being connected in series between the first positive terminal and the positive electrode, the second switch unit includes a fourth switch, the fourth switch being connected in series between the second positive terminal and the positive electrode, the control unit includes a second controller, the second controller being connected to the third switch, the fourth switch, and the current sampling unit respectively to form a second protection circuit, and the second protection circuit controls the on / off of the third switch and the fourth switch based on the sampled current value of the current sampling unit.

[0015] In one embodiment, the second protection circuit further includes a third voltage sampling resistor and a fourth voltage sampling resistor, and the second controller samples a third voltage value between the first negative electrode and the positive electrode by the third voltage sampling resistor, and samples a fourth voltage value between the positive electrode and the second negative electrode by the fourth voltage sampling resistor to obtain a second voltage average value of the third voltage value and the fourth voltage value.

[0016] In one embodiment, the second controller obtains a sampled current value of the current sampling unit, and controls the third switch and the fourth switch to be off when at least one of the sampled current value and a second voltage average value exceeds a corresponding protection threshold.

[0017] In one embodiment, the first positive terminal and the first negative terminal define a first battery port.

[0018] In one embodiment, the second positive terminal and the second negative terminal define a second battery port.

[0019] In one embodiment, the current through the first battery port and the second battery port has the same current value.

[0020] In one embodiment, the current sampling unit includes a first current sampling resistor and a second current sampling resistor, which are connected in parallel and then connected in series between the first positive terminal and the positive electrode and between the second positive terminal and the positive electrode.

[0021] A battery according to a second aspect of the present application includes a battery core and a first charging protection device, the first charging protection device including a circuit board and a battery control circuit provided on the circuit board, and the battery control circuit is the battery control circuit described in the first aspect above.

[0022] In one embodiment, the battery further includes a first conductive tab, a second conductive tab, and a third conductive tab, and the battery core includes a metal housing, an electrode assembly, a first cover plate, and a first rivet, the metal housing is a steel housing having an internal cavity and a first opening, the electrode assembly is disposed within the metal housing, the first cover plate covers the first opening to contain the electrode assembly within a closed space formed by the metal housing and the first cover plate, and the first rivet is disposed in the first cover plate and is insulated from the first cover plate.

[0023] In one embodiment, the first charging protection device is provided on the side of the battery core having the first rivet and has a first connection end connected to the battery core, the first connection end including a positive electrode, a first negative electrode, and a second negative electrode, the first negative electrode being connected to the first cover plate via the first conductive tab, the second negative electrode being connected to the first cover plate via the third conductive tab, and the positive electrode being connected to the first rivet via the second conductive tab.

[0024] In one embodiment, the first cover plate is further provided with a liquid inlet hole, the liquid inlet hole penetrating the first cover plate. An electronic device according to a third aspect of the present application includes the battery according to the second aspect and a body that houses the battery, the battery includes at least a first battery port and a second battery port, and when the battery is fixed in the body, the first battery port and the second battery port are each electrically connected to a corresponding port in the body.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows:

[0026] In the battery control circuit of the present application, the first switch unit is connected between the positive electrode and the first positive terminal, the positive electrode, the first switch unit and the first positive terminal are connected, and the first negative terminal and the first negative electrode are connected to form a first conductive path, and the second switch unit is connected between the positive electrode and the second positive terminal, the positive electrode, the second switch unit and the second positive terminal are connected, and the second negative terminal and the second negative electrode are connected to form a second conductive path. Therefore, the first switch unit and the second switch unit are both located at the positive electrode, realizing high-end driving and avoiding the short circuit problem caused by the non-insulated design of the housing during the conventional low-end driving. In the present application, the configuration of combining one positive polarity, two negative polarities, and three tabs in the high-end driving circuit can effectively reduce the heat generation during high-power charging of the circuit board and realize rapid charging at high power. The battery and electronic device of the present application can realize high-end driving. In addition, the control unit can protect the battery core by controlling the on / off of the first switch unit and the second switch unit according to the actual situation. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram of a battery module according to a first embodiment of the present application. [Diagram 2] FIG. 1 is a schematic diagram of a battery according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a front view of a battery core according to the first embodiment of the present application. [Figure 4] FIG. 2 is a top view of a battery core according to the first embodiment of the present application. [Diagram 5] 1 is a front view of a first charging protection device according to an embodiment of the present application. [Figure 6] 1 is a top view of a first charging protection device according to an embodiment of the present application. [Figure 7] FIG. 2 is a circuit diagram of a battery in one embodiment of the present application. [Figure 8] FIG. 11 is a front view of a battery core according to a second embodiment of the present application. [Figure 9] FIG. 11 is a top view of a battery core according to a second embodiment of the present invention. [Figure 10] FIG. 4 is a schematic diagram of a battery according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, the embodiments of the present application will be described in detail, and examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are merely illustrative and are intended to interpret the present application, but should not be understood as limiting the present application.

[0029] In addition, in the description of this application, the directions or positional relationships indicated by the terms "length," "width," "upper," "lower," "front," "rear," etc. are based on the directions or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of this application, and do not indicate or suggest that the devices or parts shown have a specific orientation or must be configured and operated in a specific orientation, and therefore should not be understood as limiting this application.

[0030] Additionally, the terms "first" and "second" are for descriptive purposes only and should not be understood as indicating or suggesting the relative importance or implicitly indicating the number of technical features depicted. Thus, a feature qualified with "first" or "second" may explicitly or implicitly include one or more of said features. In the present description, "plurality" means two or more, unless otherwise clearly and specifically limited.

[0031] In this application, unless otherwise clearly specified and limited, the terms "connection", "connection", "fixed", etc. should be understood in a broad sense, and may be, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two parts, or an interaction relationship between two parts. A person skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0032] A battery control circuit according to a first aspect of the present application includes a first connection terminal, a second connection terminal, and a circuit protection module. The first connection terminal is connected to a battery core and includes a positive electrode, a first negative electrode, and a second negative electrode. The second connection terminal is connected to an apparatus and includes a first positive electrode terminal, a first negative electrode terminal, a second positive electrode terminal, and a second negative electrode terminal. The circuit protection module includes a first switch unit, a second switch unit, and a control unit. The first switch unit is connected between the positive electrode and the first positive electrode terminal. The positive electrode, the first switch unit, and the first positive electrode terminal are connected, and the first negative electrode terminal and the first negative electrode are connected to form a first conductive path. The second switch unit is connected between the positive electrode and the second positive electrode terminal. The positive electrode, the second switch unit, and the second positive electrode terminal are connected, and the second negative electrode terminal and the second negative electrode are connected to form a second conductive path. The control unit controls the on / off of the first switch unit and the second switch unit.

[0033] A battery according to a second aspect of the present application includes a battery core and a first charging protection device, the first charging protection device including a circuit board and a battery control circuit provided on the circuit board, and the battery control circuit is the battery control circuit described in the first aspect above.

[0034] An electronic device according to a third aspect of the present application includes a battery as described in the second aspect above and a main body that accommodates the battery, the battery including at least a first battery port and a second battery port, and when the battery is fixed within the main body, the first battery port and the second battery port are each electrically connected to a corresponding port within the main body.

[0035] Compared with the prior art, the beneficial effects of the present application are as follows:

[0036] In the battery control circuit of the present application, the first switch unit is connected between the positive electrode and the first positive terminal, the positive electrode, the first switch unit and the first positive terminal are connected, and the first negative terminal and the first negative electrode are connected to form a first conductive path, and the second switch unit is connected between the positive electrode and the second positive terminal, the positive electrode, the second switch unit and the second positive terminal are connected, and the second negative terminal and the second negative electrode are connected to form a second conductive path. Therefore, the first switch unit and the second switch unit are both located at the positive electrode, realizing high-end driving and avoiding the short circuit problem caused by the non-insulated design of the housing during the conventional low-end driving. In the present application, the configuration of combining one positive polarity, two negative polarities, and three tabs in the high-end driving circuit can effectively reduce the heat generation during high-power charging of the circuit board and realize rapid charging at high power. The battery and electronic device of the present application can realize high-end driving. In addition, the control unit can protect the battery core by controlling the on / off of the first switch unit and the second switch unit according to the actual situation.

[0037] FIG. 1 is a schematic diagram of a module of a battery in a first embodiment of the present application. FIG. 2 is a schematic diagram of a battery in a first embodiment of the present application. As shown in FIG. 1 and FIG. 2, the battery 1000 includes a battery core 100 and a first charging protection device 200. The first charging protection device 200 protects the battery core 100 so as to realize fast charging under safe conditions. The battery 1000 further includes a first conductive tab 300, a second conductive tab 400, and a third conductive tab 500. As can be understood, the battery 1000 further includes other components, which will not be described in detail herein.

[0038] FIG. 3 is a front view of a battery core 100 in an embodiment of the present application, and FIG. 4 is a top view of the battery core 100 in an embodiment of the present application. As shown in FIG. 3 and FIG. 4, the battery core 100 includes a metal housing 11, an electrode assembly (not shown), a first cover plate 12, and a first rivet 13. The metal housing 11 has an internal cavity (not shown) and a first opening (not shown) communicating with the internal cavity. The electrode assembly is provided in the internal cavity of the metal housing 11. The first cover plate 12 covers the first opening of the metal housing 11 to accommodate the electrode assembly in a closed space formed by the metal housing 11 and the first cover plate 12, and the first rivet 13 is provided in the first cover plate 12 and insulated from the first cover plate 12. The first cover plate 12 is further provided with a liquid injection hole 14 penetrating the first cover plate 12, and the liquid injection hole 14 is used to inject an electrolyte into the internal cavity of the battery core 100. As shown in FIGS. 1, 2, 3 and 4 again, the first charging protection device 200 is provided on the side of the battery core 100 having the first rivet 13, and the first charging protection device 200 has a first connection end 221, which is connected to the battery core 100, and includes a positive electrode 2212, a first negative electrode 2211 and a second negative electrode 2213, the first negative electrode 2211 being connected to the first cover plate 12 via the first conductive tab 300, the second negative electrode 2213 being connected to the first cover plate 12 via the third conductive tab 500, and the positive electrode 2212 being connected to the first rivet 13 via the second conductive tab 400.

[0039] In one embodiment, the battery 1000 is a battery having a steel housing. The metal housing 11 is a steel housing. Thus, the battery core 100 is a battery core of a battery having a steel housing, and the first charging protection device 200 is a charging protection device of a battery having a steel housing. As can be appreciated, in other embodiments, the metal housing 11 can be a housing of other metal materials, and the first charging protection device 200 can be a charging protection device of other types of batteries.

[0040] In one embodiment, the first rivet 13 and the first cover plate 12 are insulated by providing a first insulating member 131, thereby realizing an insulating design between the first rivet 13 and the first cover plate 12 by the first insulating member 131.

[0041] In one embodiment, the first cover plate 12 may be connected to the first opening of the metal housing 11 by welding. As can be appreciated, in other embodiments, the first cover plate 12 may be provided to the first opening of the metal housing 11 in other ways.

[0042] In one embodiment, the position of the second conductive tab 400 is fixed, i.e., located at the first rivet 13, while the positions of the first conductive tab 300 and the third conductive tab 500 are adjustable, i.e., may be located at any position except the position of the first rivet 13 on the first cover plate 12, and may be located on the metal housing 11.

[0043] As shown in FIGS. 5 and 6, the first charging protection device 200 includes a circuit board 21 and a battery control circuit 22 provided on the circuit board 21.

[0044] As shown in FIGS. 1 and 2, the battery control circuit 22 includes a first connection end 221, a second connection end 222, and a circuit protection module 223; The first connection end 221 is connected to the battery core 100 and includes a positive electrode 2212, a first negative electrode 2211, and a second negative electrode 2213; The second connection end 222 is connected to the device and includes a first positive terminal 2221, a first negative terminal 2222, a second positive terminal 2223, and a second negative terminal 2224. The circuit protection module 223 includes a first switch unit 2231, a second switch unit 2232, and a control unit 2233. The first switch unit 2231 is connected between the positive electrode 2212 and the first positive electrode terminal 2221, and the positive electrode 2212, the first switch unit 2231 and the first positive electrode terminal 2221 are connected to each other, and the first negative electrode terminal 2222 and the first negative electrode 2211 are connected to each other to form a first conductive path 2002; The second switch unit 2232 is connected between the positive electrode 2212 and the second positive electrode terminal 2223, and the positive electrode 2212, the second switch unit 2232, and the second positive electrode terminal 2223 are connected, and the second negative electrode terminal 2224 and the second negative electrode 2213 are connected to each other, thereby forming a second conductive path 2003; The control unit 2233 controls the on / off of the first switch unit 2231 and the second switch unit 2232 .

[0045] Therefore, in the battery control circuit 22 of the present application, the first switch unit 2231 is provided between the positive electrode 2212 and the first positive electrode terminal 2221, and the second switch unit 2232 is provided between the positive electrode 2212 and the second positive electrode terminal 2223, i.e., the first switch unit 2231 and the second switch unit 2232 are both located at the positive electrode, realizing high-end operation and avoiding the short circuit problem caused by the non-insulated design of the housing during the conventional low-end operation. In addition, the control unit 2233 can protect the battery core 100 by controlling the on / off of the first switch unit 2231 and the second switch unit 2232 according to the actual situation.

[0046] In addition, due to the high-end operation of the battery 1000, the characteristics of the negative polarity of the metal housing 11 and the first cover plate 12, and the positive polarity of the first rivet 13 of the battery core 100 can be utilized to form a positive-polarity-driven rapid charging circuit having one positive polarity and two negative polarities, thereby effectively solving the problem of short circuit with the electronic device body caused by the non-insulated design of the metal housing 11 of the battery core, and the non-insulated design can improve the battery capacity.

[0047] Furthermore, in one embodiment, the control unit 2233 has high-end driving capability, and the voltage difference between the voltage output from the control unit 2233 and the voltage of the positive electrode 2212 is greater than zero.

[0048] Furthermore, in one embodiment, the voltage difference between the voltage output from the control unit 2233 and the voltage of the positive electrode 2212 is greater than or equal to 4V.

[0049] Therefore, the control unit 2233 can achieve high-end driving.

[0050] Further, in one embodiment, the first charging protection device 200 can transmit current via a first conductive path 2002 and a second conductive path 2003. The first positive terminal 2221 and the first negative terminal 2222 form a first battery port 2225, and the second positive terminal 2223 and the second negative terminal 2224 form a second battery port 2226. As can be appreciated, the current flowing through the first battery port 2225 and the second battery port 2226 should be the same, which helps to balance the overall temperature rise of the first charging protection device 200.

[0051] Further, in one embodiment, as shown in FIG. 2 again, the circuit board 21 has an elongated shape and includes two first sides 211 arranged opposite to each other and two second sides 212 arranged opposite to each other. The length of the first sides 211 is greater than the length of the second sides 212. The first sides 211 are arranged along the width direction of the battery core 100. The second sides 212 are arranged perpendicular to the first sides 211. The first conductive tab 300, the second conductive tab 400, and the third conductive tab 500 are arranged at intervals along the first sides 211. As shown in FIG. 5 and FIG. 6, the first conductive tab 300, the second conductive tab 400, and the third conductive tab 500 have an L-shape. The first ends of the first conductive tab 300, the second conductive tab 400 and the third conductive tab 500 are connected to the circuit board 21 by surface mount technology, i.e., SMT patch, the second ends of the first conductive tab 300 and the third conductive tab 500 are electrically connected to the first cover plate 12, and the second end of the second conductive tab 400 is electrically connected to the first rivet 13.

[0052] Preferably, in one embodiment, the first conductive tab 300, the second conductive tab 400 and the third conductive tab 500 are nickel plates, which may be realized by, for example, but not limited to, nickel plating on copper.

[0053] Preferably, in one embodiment, the first conductive tab 300, the second conductive tab 400 and the third conductive tab 500 are L-shaped, although they may be of other shapes.

[0054] 7 is a circuit diagram of the first charging protection device 200 in an embodiment of the present application. As shown in FIG. 7, the circuit protection module 223 further includes a current sampling unit 2234, which is connected in series between the first positive terminal 2221 and the positive electrode 2212, and is connected in series between the second positive terminal 2223 and the positive electrode 2212. The control unit 2233 controls the on / off of the first switch unit 2231 and the second switch unit 2232 according to the sampling current value of the current sampling unit 2234.

[0055] Further, in one embodiment, the current sampling unit 2234 includes a first current sampling resistor R1 and a second current sampling resistor R2, and the first current sampling resistor R1 and the second current sampling resistor R2 are connected in parallel and then connected in series between the first positive terminal 2221 and the positive electrode 2212, and between the second positive terminal 2223 and the positive electrode 2212.

[0056] Therefore, the present application can determine the magnitude of the current passing through based on the voltage drop across the current sampling unit 2234, and further control the on / off of the first switch unit 2231 and the second switch unit 2232 based on the magnitude of the current.

[0057] As can be appreciated, the current sampling unit 2234 may be a parallel connection of multiple current sampling resistors, which can reduce heat generation.

[0058] Preferably, in one embodiment, the circuit protection module 223 includes a first protection circuit, which protects the first conductive path 2002 and the second conductive path 2003 so as to charge and discharge in a normal state. The first protection circuit is formed between the first negative electrode 2211, the positive electrode 2212 and the first battery port 2225, and is also formed between the second negative electrode 2213, the positive electrode 2212 and the second battery port 2226. Specifically, in one embodiment, the first switch unit 2231 includes a first switch S2, which is connected in series between the first positive terminal 2221 and the positive electrode 2212; the second switch unit 2232 includes a second switch S3, which is connected in series between the second positive terminal 2223 and the positive electrode 2212; the control unit 2233 includes a first controller U1, which is respectively connected to the first switch S2, the second switch S3 and the current sampling unit 2234 to form a first protection circuit, which controls the on / off of the first switch S2 and the second switch S3 based on the sampled current value of the current sampling unit 2234, and serves to protect the battery core 100. Specifically, the first controller U1 detects the magnitude of the charging / discharging current of the battery core 100, and when the charging / discharging current exceeds a protection threshold, the first controller U1 of the first protection circuit controls the first switch S2 and the second switch S3 to be turned off, thereby cutting off the conductive path between the positive electrode 2212 and the first battery port 2225, and the conductive path between the positive electrode 2212 and the second battery port 2226, thereby protecting the battery core 100.

[0059] Further, in one embodiment, the first controller U1 has a CO1 terminal and a DO1 terminal. The first switch S2 includes a charge switch K3 and a discharge switch K4. The second switch S3 includes a charge switch K1 and a discharge switch K2. The CO1 terminal and the DO1 terminal of the first controller U1 can output a voltage to the positive pole 2212, and the value of the voltage may be in the range of 4-5V, 4-6V, or other voltage value, that is, the voltage of the CO1 terminal and the DO1 terminal of U1 may be higher than the voltage of the positive pole 2212 by 4-5V, 4-6V, or other voltage value. The CO1 terminal of the first controller U1 may drive the charging switch K3 to be turned on via the G3 terminal of the first switch S2 and drive the charging switch K1 to be turned on via the G1 terminal of the second switch S3, and the DO1 terminal of the first controller U1 may drive the discharging switch K4 to be turned on via the G4 terminal of the first switch S2 and drive the discharging switch K2 to be turned on via the G2 terminal of the second switch S3, thereby forming a conductive path between the L3 terminals and L4 terminals of the first switch S2 and forming a conductive path between the L1 terminals and L2 terminals of the second switch S3.

[0060] Preferably, in one embodiment, the first protection circuit further includes a first voltage sampling resistor RV1 and a second voltage sampling resistor RV2, and the first controller U1 samples a first voltage value between the first negative pole 2211 and the positive pole 2212 by the first voltage sampling resistor RV1, and samples a second voltage value between the positive pole 2212 and the second negative pole 2213 by the second voltage sampling resistor RV2 to obtain a first voltage average value of the first voltage value and the second voltage value. The first controller U1 further samples a sampled current value of the current sampling unit 2234. The first controller U1 controls the first switch S2 and the second switch S3 to be turned off when at least one of the sampled current value and the first voltage average value exceeds a corresponding protection threshold.

[0061] Preferably, in one embodiment, the battery control circuit 22 further includes a filter capacitor C1. The first controller U1, the first switch S2, the second switch S3, the first voltage sampling resistor RV1, the second voltage sampling resistor RV2, the first current sampling resistor R1, the second current sampling resistor R2, and the filter capacitor C1 together constitute a first protection circuit. The first controller U1 is a protection IC with high-end voltage driving capability, and the VD1 terminal of the first controller U1 provides the input of the operating power supply, and is connected to both ends of the first current sampling resistor R1 and the second current sampling resistor R2 connected in parallel as a current sampling signal line together with the CS1 terminal, and judges whether the charging / discharging current exceeds the current protection threshold according to the magnitude of the voltage drop reflected at both ends of the first current sampling resistor R1 and the second current sampling resistor R2. The VD1 terminal and the VS1 terminal of the first controller U1 are both used as sampling signal lines for the voltage of the battery core 100, and the VS1 terminal is the zero potential point of the first controller U1. The first voltage sampling resistor RV1 is connected between the first negative pole 2211 and the VS1 terminal of the first controller U1, and is used to sample the first voltage value between the positive pole 2212 and the first negative pole 2211. The filter capacitor C1 is connected between the VD1 terminal and the VS1 terminal. The second voltage sampling resistor RV2 is connected between the second negative pole 2213 and the VS1 terminal of the first controller U1, and is used to sample the second voltage value between the positive pole 2212 and the second negative pole 2213, to obtain a first voltage average value of the first voltage value and the second voltage value, and when the first voltage average value exceeds the overvoltage protection threshold of the first controller U1, the CO1 terminal of the first controller U1 goes from high level to low level, and the first switch S2 and the second switch S3 are controlled to be turned off to protect the battery core 100, and charging cannot be performed. When the first voltage average value is lower than the undervoltage protection threshold of the first controller U1, the CO1 terminal and the DO1 terminal of the first controller U1 go from high level to low level, and the first switch S2 and the second switch S3 are controlled to be turned off to protect the battery core 100, and discharging cannot be performed.

[0062] Preferably, in one embodiment, the circuit protection module 223 includes a second protection circuit, which protects the first conductive path 2002 and the second conductive path 2003 to charge and discharge under normal circumstances. Specifically, the second protection circuit is formed between the first negative electrode 2211, the positive electrode 2212, and the first battery port 2225, and is also formed between the positive electrode 2212, the second negative electrode 2213, and the second battery port 2226. Specifically, in one embodiment, the first switch unit 2231 includes a third switch S1, which is connected in series between the first positive terminal 2221 and the positive electrode 2212. The second switch unit 2232 includes a fourth switch S4, which is connected in series between the second positive terminal 2223 and the positive electrode 2212. The control unit 2233 includes a second controller U2, which is respectively connected to the third switch S1, the fourth switch S4 and the current sampling unit 2234 to form a second protection circuit, and the second protection circuit controls the on-off of the third switch S1 and the fourth switch S4 according to the sampled current value of the current sampling unit 2234. Specifically, when the charge / discharge current of the battery core 100 exceeds a protection threshold, the second controller U2 controls the third switch S1 and the fourth switch S4 to be turned off, thereby blocking the conductive path between the positive electrode 2212 and the first battery port 2225 and the conductive path between the positive electrode 2212 and the second battery port 2226, thereby protecting the battery core 100.

[0063] It can be understood that the first protection circuit and the second protection circuit are two independent protection circuits, and jointly protect the battery core 100. When the protection of one protection circuit is disabled, the other protection circuit protects the battery core 100. When both the first protection circuit and the second protection circuit operate normally, the first protection circuit should logically perform the protection operation, especially the voltage protection function, first. The voltage protection includes overvoltage protection and undervoltage protection, and the overvoltage protection threshold is usually about 4.6V, and the undervoltage protection threshold is usually about 2.5V.

[0064] Specifically, in one embodiment, the third switch S1 includes a charging switch K5 and a discharging switch K6. The fourth switch S4 includes a charging switch K7 and a discharging switch K8. The second controller U2 has high-end driving capability, and the CO2 terminal and the DO2 terminal of the second controller U2 output a voltage to the positive pole 2212, and the voltage value range is 4 to 5V, and may be 4 to 6V or other voltage values. That is, the CO2 terminal of the second controller U2 drives the charging switch K5 to be turned on by the G5 terminal of the third switch S1, and drives the charging switch K7 to be turned on by the G7 terminal of the fourth switch S4, and the DO2 terminal of the second controller U2 drives the discharging switch K6 to be turned on by the G6 terminal of the third switch S1, and drives the discharging switch K8 to be turned on by the G8 terminal of the fourth switch S4, thereby forming a conductive path between the L5 terminal and the L6 terminal of the third switch S1, and forming a conductive path between the L7 terminal and the L8 terminal of the fourth switch S4 unit. When the first switch S2, the second switch S3, the third switch S1 and the fourth switch S4 are all turned on, the charging / discharging circuit from the first battery port 2225 and the second battery port 2226 to the battery core 100 is fully conductive, and charging or discharging can be performed.

[0065] As can be understood, in one embodiment, the first switch S2, the second switch S3, the third switch S1 and the fourth switch S4 are voltage-driven MOS transistors, which are very widely applied in the battery control circuit 22, and the operation principle thereof will not be described in detail here. The first switch S2 and the second switch S3 are simultaneously controlled by the first controller U1 to be on and off, and the third switch S1 and the fourth switch S4 are simultaneously controlled by the second controller U2 to be on and off, and the first switch S2, the second switch S3, the third switch S1 and the fourth switch S4 should be the same model number on the same circuit board 21 and have symmetry, for example, the first switch Regarding the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4, each may be one, or each may be one or more and be connected in parallel with the same number of switches. Each of the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 may be connected in parallel to reduce internal resistance and reduce heat generation. For example, each of the first switch S2, the second switch S3, the third switch S1, and the fourth switch S4 is connected in parallel with one switch, so that there are a total of eight switches, and the switches connected in parallel to each other are designed back-to-back in the layout, thereby realizing that the line impedance between the parallel-connected switches is minimized.

[0066] Therefore, adjacent to the positive pole 2212 (i.e., the first rivet 13) of the first battery port 2225 is the first positive pole terminal 2221 of the first battery port 2225, which is connected to the third switch S1 and the first switch S2 and merges into the first current sampling resistor R1, and away from the positive pole 2212 is the first negative pole terminal 2222 of the first battery port 2225. Adjacent to the positive pole 2212 of the second battery port 2226 is the second positive pole terminal 2223 of the second battery port 2226, which is connected to the fourth switch S4 and the second switch S3 and merges into the second current sampling resistor R2, and away from the positive pole 2212 is the second negative pole terminal 2224 of the second battery port 2226. The structure from the first positive terminal 2221 of the first battery port 2225 to the first switch unit 2231, and the structure from the second positive terminal 2223 of the second battery port 2226 to the second switch unit 2232 are two-way shunt structures, and the first negative terminal 2222 of the first battery port 2225 and the second negative terminal 2224 of the second battery port 2226 are directly connected to the first cover plate 12 via the first negative electrode 2211 and the second negative electrode 2213. The negative polarity of the first cover plate 12 saves the connection space between them through the copper foil on the circuit board 21, reduces the heat dissipation pressure of the circuit board 21, and the metal housing 11 corresponds to a large heat dissipation fin, which can quickly dissipate heat generated in the conductive path of the first negative electrode 2211 and the second negative electrode 2213. In addition, the first switch S2, the second switch S3, the third switch S1, the fourth switch S4, and the first current sampling resistor R1 and the second current sampling resistor R2 are all provided at the positive terminal of the battery core 100 to realize high-end driving, and the first controller U1 and the second controller U2 have high-end driving capability, and their CO1 terminals, DO1 terminals, CO2 terminals, and DO2 terminals can output a voltage higher than that of the battery core 100, for example, a voltage more than one time the voltage of the battery core 100, and can be driven to open the gates of the first switch unit 2231 and the second switch unit 2232.

[0067] Preferably, in one embodiment, the second protection circuit further includes a third voltage sampling resistor RV3 and a fourth voltage sampling resistor RV4, and the second controller U2 samples a third voltage value between the first negative pole 2211 and the positive pole 2212 by the third voltage sampling resistor RV3 and samples a fourth voltage value between the positive pole 2212 and the second negative pole 2213 by the fourth voltage sampling resistor RV4 to obtain a second voltage average value of the third voltage value and the fourth voltage value, and the second controller U2 further samples the total current value of the current sampling unit 2234, and the second controller U2 controls the third switch S1 and the fourth switch S4 to be off when at least one of the sampled current value and the second voltage average value exceeds a corresponding protection threshold.

[0068] Preferably, in one embodiment, the battery control circuit 22 further includes a second filter capacitor C2, and the second controller U2, the third switch S1, the fourth switch S4, the third voltage sampling resistor RV3, the fourth voltage sampling resistor RV4, the first current sampling resistor R1 and the second current sampling resistor R2 together constitute a second protection circuit. The second controller U2 is a protection IC with high-end voltage driving capability, and the VD2 terminal of the second controller U2 provides the input of the operating power supply, and is connected to both ends of the first current sampling resistor R1 and the second current sampling resistor R2 connected in parallel as a current sampling signal line together with the CS2 terminal, and judges whether the charging / discharging current exceeds the current protection threshold according to the magnitude of the voltage drop reflected at both ends of the first current sampling resistor R1 and the second current sampling resistor R2. The third voltage sampling resistor RV3 and the fourth voltage sampling resistor RV4 provide voltage sampling for the second controller U2, and the VD2 terminal and the VS2 terminal of the second controller U2 are both used as sampling signal lines of the voltage of the battery core, and the VS2 terminal is the zero potential point of the second controller U2, the third voltage sampling resistor RV3 is connected between the first negative pole 2211 and the VS2 terminal of the second controller U2, and is used to sample the third voltage value between the positive pole 2212 and the first negative pole 2211, and the fourth voltage sampling resistor RV4 is connected between the second negative pole 2213 and the VS2 terminal of the second controller U2, and is used to sample the fourth voltage value between the positive pole 2212 and the second negative pole 2213, and obtains the second voltage average value according to the third voltage value and the fourth voltage value. The filter capacitor C2 is connected between the VD2 terminal and the VS2 terminal. When the second voltage average value exceeds the overvoltage protection threshold of the second controller U2, the CO2 terminal of the second controller U2 goes from high to low, the third switch S1 and the fourth switch S4 are controlled to be turned off to protect the battery core 100, and charging is not possible. When the second voltage average value is lower than the undervoltage protection threshold of the second controller U2, the CO2 terminal and the DO2 terminal of the second controller U2 go from high to low, the third switch S1 and the fourth switch S4 are controlled to be turned off to protect the battery core 100, and discharging is not possible.

[0069] Preferably, in one embodiment, the battery control circuit 22 further includes a communication management circuit, and the communication management circuit includes a third controller U3, a current sampling unit 2234, and a fifth voltage sampling resistor RV5. The third controller U3 is provided adjacent to the first controller U1 or adjacent to the second controller U2. Preferably, in one embodiment, the third controller U3 may be provided integrally with the first controller U1 or may be provided integrally with the second controller U2. The third controller U3 includes a temperature detection resistor NTC, and the temperature detection resistor NTC detects the temperature of the battery core 100, so that the electronic device system determines the charging policy. The fifth voltage sampling resistor RV5 is connected to the positive pole 2212 and the VD3 terminal of the third controller U3, and the VS3 terminal of the third controller U3 is connected to the first negative pole 2211 and the second negative pole 2213, to sample a fifth voltage value between the first negative pole 2211 and the positive pole 2212 and a sixth voltage value between the positive pole 2212 and the second negative pole 2213, and obtain a third voltage average value based on the fifth voltage value and the sixth voltage value. The third controller U3, the fifth voltage sampling resistor RV5, the temperature detection resistor NTC, the first current sampling resistor R1 and the second current sampling resistor R2 together constitute a communication management circuit. The VD3 terminal of the third controller U3 is a voltage sampling terminal and is connected to the positive pole 2212, the VS3 terminal is the zero potential point of the third controller U3 and is connected to the first negative pole 2211 and the second negative pole 2213, the SRN terminal and the SRP terminal are current sampling signal lines and are respectively connected to both ends of the first current sampling resistor R1 and the second current sampling resistor R2 connected in parallel, the SCL terminal is a clock signal line, the SDA terminal is a data signal line, and the SCL terminal and the SDA terminal together constitute the information interaction function between the communication management circuit and the electronic device. The third controller U3 samples the voltage, current and temperature values ​​of the battery core 100 and reports them to the electronic device for installing the battery 1000, so that the electronic device makes a corresponding decision.

[0070] In this way, the first protection circuit, the second protection circuit and the communication management circuit share the first current sampling resistor R1 and the second current sampling resistor R2. The first controller U1, the second controller U2 and the third controller U3 can determine the magnitude of the current in the charging circuit and the discharging circuit by detecting the voltage drop across the first current sampling resistor R1 and the second current sampling resistor R2, and perform corresponding determinations and corresponding controls.

[0071] Preferably, in one embodiment, Fig. 8 and Fig. 9 are schematic diagrams of a battery core 100a in the second embodiment of the present application. Fig. 10 is a schematic diagram of a battery in the second embodiment of the present application. As shown in Figs. 8 to 10, the differences from the first embodiment are as follows. In the second embodiment, the metal housing 11 further has a second opening provided opposite to the first opening, and the battery core 100a further includes a second cover plate 15, which forms a closed cavity by covering the second opening, and as can be understood, the second cover plate 15 may cover the second opening by welding, but is not limited thereto. The second cover plate 15 is provided with a second rivet 16, which penetrates the second cover plate 15 and is connected to the positive electrode of the electrode assembly, and the second rivet 16 and the second cover plate 15 are insulated from each other, and the negative electrode of the electrode assembly is connected to the second cover plate 15. The battery 1000a further includes a second charging protection device 600, which includes a second circuit board 61 and a battery control circuit. As can be understood, the control circuit is similar to the battery control circuit 22 in the first embodiment, and detailed description is omitted here. The battery 1000a further includes a fourth conductive tab 700, a fifth conductive tab 800, and a sixth conductive tab 900, where the fourth conductive tab 700 and the sixth conductive tab 900 are located on both sides of the fifth conductive tab 800. The second charging protection device 600 further includes a third battery port 650 and a fourth battery port 660, where the third battery port 650 and the fourth battery port 660 may both be used for charging and discharging.

[0072] Therefore, in this embodiment, the metal housing 11 is provided with two sets of upper and lower cover plates, i.e., a first cover plate 12 and a second cover plate 15, the first cover plate 12 is provided with a first rivet 13, and the second cover plate 15 is provided with a second rivet 16. Thus, by simultaneously charging using the first battery port 2225, the second battery port 2226, the third battery port 650, and the fourth battery port 660, the charging power can be doubled, for example, if a single rivet design can realize a 100W fast charging, a double rivet design can realize a 200W fast charging.

[0073] Preferably, in one embodiment, the third battery port 650 is disposed adjacent to the fourth conductive tab 700 and the fourth battery port 660 is disposed adjacent to the sixth conductive tab 900 .

[0074] Furthermore, in one embodiment, the second rivet 16 and the second cover plate 15 are insulated from each other by a second insulating member.

[0075] In addition, the electronic device of the present application includes a battery and a main body that accommodates the battery, the battery being the above-mentioned battery 1000, the battery 1000 including a first battery port 2225 and a second battery port 2226, and when the battery 1000 is fixed within the main body, the first battery port 2225 and the second battery port 2226 are each electrically connected to a corresponding port within the main body.

[0076] Preferably, in another embodiment, the battery is the above-mentioned battery 1000a, the battery 1000a includes the first battery port 2225, the second battery port 2226, the third battery port 650 and the fourth battery port 660, and when the battery 1000a is fixed in the electronic device body, the first battery port 2225, the second battery port 2226, the third battery port 650 and the fourth battery port 660 are electrically connected to the corresponding ports in the electronic device body, respectively, thereby further improving the charging efficiency.

[0077] As can be seen from the above, the present application has the excellent performance described above, and therefore has effects in use that cannot be achieved by the prior art, and is a product that is practical and has high practical value.

[0078] The above description is only a preferred embodiment of the present application, and does not limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present application should be included within the protection scope of the present application.

Claims

1. A battery control circuit (22) including a first connection end (221), a second connection end (222), and a circuit protection module (223), The first connection end (221) is connected to a battery core (100) of the battery, and the first connection end (221) includes a positive electrode (2212), a first negative electrode (2211), and a second negative electrode (2213); The second connection end (222) is connected to an external device of the battery, and the second connection end (222) includes a first positive terminal (2221), a first negative terminal (2222), a second positive terminal (2223), and a second negative terminal (2224); The circuit protection module (223) includes a first switch unit (2231), a second switch unit (2232) and a control unit (2233); The first switch unit (2231) is connected between the positive electrode (2212) and the first positive electrode terminal (2221), and the positive electrode (2212), the first switch unit (2231) and the first positive electrode terminal (2221) are connected, and the first negative electrode terminal (2222) and the first negative electrode (2211) are connected to form a first conductive path (2002); The second switch unit (2232) is connected between the positive electrode (2212) and the second positive electrode terminal (2223), and the positive electrode (2212), the second switch unit (2232) and the second positive electrode terminal (2223) are connected, and the second negative electrode terminal (2224) and the second negative electrode (2213) are connected to form a second conductive path (2003); A battery control circuit (22), characterized in that the control unit (2233) controls the on / off of the first switch unit (2231) and the on / off of the second switch unit (2232).

2. 2. The battery control circuit (22) according to claim 1, characterized in that the voltage difference between the voltage output from the control unit (2233) and the voltage of the positive electrode (2212) is 4V or more.

3. The battery control circuit (22) according to claim 1 or 2, characterized in that the circuit protection module (223) further includes a current sampling unit (2234), the current sampling unit (2234) being connected in series between the first positive terminal (2221) and the positive electrode (2212), the current sampling unit (2234) being further connected in series between the second positive terminal (2223) and the positive electrode (2212), and the control unit (2233) controls the on / off of the first switch unit (2231) and the second switch unit (2232) based on the sampled current value of the current sampling unit (2234).

4. 4. The battery control circuit according to claim 3, wherein the first switch unit (2231) includes a first switch (S2), the first switch (S2) being connected in series between the first positive terminal (2221) and the positive pole (2212); the second switch unit (2232) includes a second switch (S3), the second switch (S3) being connected in series between the second positive terminal (2223) and the positive pole (2212); the control unit (2233) includes a first controller (U1), the first controller (U1) being connected to the first switch (S2), the second switch (S3), and the current sampling unit (2234) respectively to form a first protection circuit, and the first protection circuit controls the on / off of the first switch (S2) and the second switch (S3) based on a sampled current value of the current sampling unit (2234).

5. The battery control circuit (22) of claim 4, characterized in that the first protection circuit further includes a first voltage sampling resistor (RV1) and a second voltage sampling resistor (RV2), and the first controller (U1) samples a first voltage value between the first negative electrode (2211) and the positive electrode (2212) by the first voltage sampling resistor (RV1) and samples a second voltage value between the positive electrode (2212) and the second negative electrode (2213) by the second voltage sampling resistor (RV2) to obtain a first voltage average value of the first voltage value and the second voltage value.

6. The battery control circuit (22) of claim 5, characterized in that the first controller (U1) obtains a sampled current value of the current sampling unit (2234), and controls the first switch (S2) and the second switch (S3) to be off when at least one of the sampled current value and the first voltage average value exceeds a corresponding protection threshold.

7. 5. The battery control circuit according to claim 3, wherein the first switch unit (2231) includes a third switch (S1), the third switch (S1) being connected in series between the first positive terminal (2221) and the positive pole (2212); the second switch unit (2232) includes a fourth switch (S4), the fourth switch (S4) being connected in series between the second positive terminal (2223) and the positive pole (2212); the control unit (2233) includes a second controller (U2), the second controller (U2) being connected to the third switch (S1), the fourth switch (S4), and the current sampling unit (2234) respectively to form a second protection circuit, and the second protection circuit controls the on / off of the third switch (S1) and the fourth switch (S4) based on a sampled current value of the current sampling unit (2234).

8. 8. The battery control circuit (22) of claim 7, wherein the second protection circuit further includes a third voltage sampling resistor (RV3) and a fourth voltage sampling resistor (RV4), and the second controller (U2) samples a third voltage value between the first negative electrode (2211) and the positive electrode (2212) by the third voltage sampling resistor (RV3) and samples a fourth voltage value between the positive electrode (2212) and the second negative electrode (2213) by the fourth voltage sampling resistor (RV4) to obtain a second voltage average value of the third voltage value and the fourth voltage value.

9. The battery control circuit (22) of claim 8, wherein the second controller (U2) further obtains a sampled current value of the current sampling unit (2234), and controls the third switch (S1) and the fourth switch (S4) to be off when at least one of the sampled current value and a second voltage average value exceeds a corresponding protection threshold.

10. The battery control circuit (22) according to any one of claims 1 to 9, characterized in that the first positive terminal (2221) and the first negative terminal (2222) constitute a first battery port (2225).

11. 11. The battery control circuit (22) of claim 10, wherein the second positive terminal (2223) and the second negative terminal (2224) form a second battery port (2226).

12. 12. The battery control circuit (22) of claim 11, wherein the currents flowing through the first battery port (2225) and the second battery port (2226) have the same current value.

13. The battery control circuit (22) according to any one of claims 3 to 12, characterized in that the current sampling unit (2234) comprises a first current sampling resistor (R1) and a second current sampling resistor (R2).

14. The battery control circuit (22) of claim 13, characterized in that the first current sampling resistor (R1) and the second current sampling resistor (R2) are connected in parallel and then connected in series between the first positive terminal (2221) and the positive electrode (2212) and between the second positive terminal (2223) and the positive electrode (2212).

15. A battery (1000) comprising a battery core (100) and a first charging protection device (200), the first charging protection device (200) comprising a circuit board (21) and a battery control circuit (22) provided on the circuit board, the battery control circuit being a battery control circuit as described in any one of claims 1 to 15.

16. 16. The battery (1000) of claim 15, further comprising a first conductive tab (300), a second conductive tab (400), and a third conductive tab (500), wherein the battery core (100) comprises a metal housing (11), an electrode assembly, a first cover plate (12), and a first rivet (13), wherein the metal housing (11) is a steel housing, the metal housing (11) has an internal cavity and is provided with a first opening, the electrode assembly is provided within the metal housing (11), the first cover plate (12) covers the first opening to contain the electrode assembly within a closed space formed by the metal housing (11) and the first cover plate (12), and the first rivet (13) is provided on the first cover plate (12) and is insulated from the first cover plate (12).

17. The battery (1000) of claim 16, characterized in that the first charging protection device (200) is provided on a side of the battery core (100) having the first rivet (13), the first charging protection device (200) has a first connection end (221) connected to the battery core (100), the first negative electrode (2211) is connected to the first cover plate (12) via the first conductive tab (300), the second negative electrode (2213) is connected to the first cover plate (12) via the third conductive tab (500), and the positive electrode (2212) is connected to the first rivet (13) via the second conductive tab (400).

18. The battery (1000) of any one of claims 15 to 17, characterized in that the first cover plate (12) is further provided with a liquid inlet hole (14), the liquid inlet hole (14) penetrating the first cover plate (12).

19. An electronic device comprising: a battery (1000) according to any one of claims 15 to 18; and a main body that accommodates the battery, wherein the battery (1000) includes at least a first battery port (2225) and a second battery port (2226), and when the battery (1000) is fixed within the main body, the first battery port and the second battery port are each electrically connected to a corresponding port within the main body.

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