A battery double-layer protection circuit and battery device

Abstract

The present invention discloses a battery double-layer protection circuit and a battery device, wherein the circuit comprises a charging positive electrode interface, a charging negative electrode interface, a plurality of connection point interfaces, a charging control module, a plurality of balancing control modules and an overcharging protection module; in the technical scheme, a primary protection function of the charging and discharging process of a battery pack is realized by the charging control module, and the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack is controlled according to the potential of each connection point interface; a secondary protection function of the charging process of the battery pack is realized by the overcharging protection module, and the electrical connection between the positive electrode interface of the battery pack and the charging negative electrode interface is controlled according to the potential of each connection point interface, that is, when an abnormal condition occurs, the positive electrode interface of the battery pack and the charging negative electrode interface can be short-circuited to protect the battery pack, thereby improving the reliability and safety of the charging process; the balance of the battery pack during the charging process is ensured by the setting of the balancing control module.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and more specifically to a battery double-layer protection circuit and a battery device using the circuit. Background Art

[0002] In real life, those skilled in the art are well aware that the voltage that a single battery can provide is very limited, so the battery-powered products we see in daily life generally use two or more batteries connected in series for power supply.

[0003] With the development of rechargeable battery technology, manufacturers of related battery-powered products have already applied rechargeable batteries to the products they produce. However, due to certain differences in the internal characteristics of multiple batteries connected in series, the imbalance between the batteries is easily increased during the charging process, resulting in a decrease in the overall performance and service life of the battery pack. In the prior art, there are few corresponding protection measures for this problem. In the prior art, only the first-level protection function of the battery pack is realized through the charge and discharge control circuit, but the battery pack cannot achieve balanced charging during the charging process, and the battery pack is only equipped with a first-level protection circuit, and its reliability and safety are still poor. Summary of the invention

[0004] The object of the present invention is to provide a battery double-layer protection circuit and a battery device using the circuit to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A battery double-layer protection circuit, comprising:

[0007] Positive charging port, used to connect to the positive power supply port of an external charger;

[0008] A negative charging port, used to connect to the negative power supply port of an external charger;

[0009] A connection point interface, which is provided with multiple ones, and is used to connect with the positive and negative electrodes of each battery in the battery pack in a one-to-one correspondence. The connection point interface connected to the positive electrode of the battery pack is defined as the battery pack positive electrode interface, and the connection point interface connected to the negative electrode of the battery pack is defined as the battery pack negative electrode interface. The charging negative electrode interface is connected to the battery pack negative electrode interface;

[0010] A charging control module, connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces respectively, and used to control the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack according to the potential of each of the connection point interfaces;

[0011] A balance control module, which is provided with a plurality of balance control modules, each of which is connected to two adjacent connection point interfaces, and is used to control the electrical connection of the two adjacent connection point interfaces according to the potential of the two adjacent connection point interfaces;

[0012] The overcharge protection module is respectively connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces, and the overcharge protection module is used to control the electrical connection between the battery pack positive electrode interface and the charging negative electrode interface according to the potential of each of the connection point interfaces.

[0013] As a further improvement of the above technical solution, the charging control module includes a charging control chip and a switch tube Q1. The charging control chip is configured with a charging control terminal and multiple voltage detection terminals. Each of the voltage detection terminals of the charging control chip is connected one-to-one with each of the connection point interfaces. The charging control terminal of the charging control chip is connected to the gate of the switch tube Q1, the source of the switch tube Q1 is connected to the charging positive electrode interface, and the drain of the switch tube Q1 is connected to the positive electrode interface of the battery pack.

[0014] As a further improvement of the above technical solution, the charging control module also includes a switch tube Q2, and the charging control chip is also configured with a discharge control end. The discharge control end of the charging control chip is connected to the gate of the switch tube Q2, the drain of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the positive electrode interface of the battery pack.

[0015] As a further improvement of the above technical solution, the balance control module includes a balance control chip and a switch tube Q3, the balance control chip is configured with two potential detection terminals and an output control terminal, the two potential detection terminals of the balance control chip are connected to the two adjacent connection point interfaces in a one-to-one correspondence, the output control terminal of the balance control chip is connected to the gate of the switch tube Q3, and the source and drain of the switch tube Q3 are connected to the two adjacent connection point interfaces in a one-to-one correspondence.

[0016] As a further improvement of the above technical solution, the overcharge protection module includes an overcharge protection chip and a switch tube Q4. The overcharge protection chip is configured with a charging output terminal and multiple voltage input terminals. The voltage input terminal of the overcharge protection chip is connected one-to-one with each of the connection point interfaces. The charging output terminal of the overcharge protection chip is connected to the gate of the switch tube Q4. The source and drain of the switch tube Q4 are connected one-to-one with the positive electrode interface of the battery pack and the negative charging electrode interface.

[0017] As a further improvement of the above technical solution, the overcharging protection module also includes a switch tube Q5, the charging output end of the overcharging protection chip is connected to the gate of the switch tube Q5, the source of the switch tube Q5 is connected to the charging negative electrode interface, the drain of the switch tube Q5 is respectively connected to the gate of the switch tube Q4 and the positive electrode interface of the battery pack, and the source and drain of the switch tube Q4 are connected one-to-one with the charging negative electrode interface and the negative electrode interface of the battery pack.

[0018] The present invention also discloses a battery device, including the above-mentioned battery double-layer protection circuit and multiple batteries, wherein two adjacent connection point interfaces are defined as a loading position, and each of the batteries is connected to each of the loading positions one by one.

[0019] The beneficial effects of the present invention are as follows: in the present technical solution, a first-level protection function for the charging and discharging process of the battery pack is realized by a charging control module, and the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack is controlled according to the potential of each connection point interface; a second-level protection function for the charging process of the battery pack is realized by an overcharge protection module, and the electrical connection between the positive electrode interface of the battery pack and the charging negative electrode interface is controlled according to the potential of each connection point interface, that is, when an abnormal condition occurs, the positive electrode interface of the battery pack and the charging negative electrode interface can be short-circuited to protect the battery pack, thereby improving the reliability and safety of the charging process; the balance of the battery pack during the charging process is ensured by the setting of the balancing control module, and when a battery in the battery pack is fully charged, the balancing control module can short-circuit the two connection point interfaces connected to the battery to ensure that the battery is no longer charged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0021] Figure 1 It is a circuit module framework diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the circuit principle of the present invention. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In the description of the present invention, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 The present application discloses a battery double-layer protection circuit and a battery device using the same. The first embodiment of the battery double-layer protection circuit includes:

[0028] Positive charging port, used to connect to the positive power supply port of an external charger;

[0029] A negative charging port, used to connect to the negative power supply port of an external charger;

[0030] A connection point interface, which is provided with multiple ones, is used to be connected to the positive and negative electrodes of each battery in the battery pack in a one-to-one correspondence, that is, in actual application, the positive electrode and the negative electrode of each battery in the battery pack are only connected to a single connection point interface, the connection point interface connected to the positive electrode of the battery pack is defined as the positive electrode interface of the battery pack, and the connection point interface connected to the negative electrode of the battery pack is defined as the negative electrode interface of the battery pack, and the charging negative electrode interface is connected to the negative electrode interface of the battery pack;

[0031] A charging control module, connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces respectively, and used to control the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack according to the potential of each of the connection point interfaces;

[0032] A balance control module, which is provided with a plurality of balance control modules, each of which is connected to two adjacent connection point interfaces, and is used to control the electrical connection of the two adjacent connection point interfaces according to the potential of the two adjacent connection point interfaces;

[0033] The overcharge protection module is respectively connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces, and the overcharge protection module is used to control the electrical connection between the battery pack positive electrode interface and the charging negative electrode interface according to the potential of each of the connection point interfaces.

[0034] The charging control module in this embodiment serves as the first-level protection circuit for charging the battery pack. It calculates the voltage between two adjacent connection point interfaces according to the potential of each of the connection point interfaces received, that is, it calculates the voltage of the battery connected to the two adjacent connection point interfaces during the actual charging process. When it is found that the voltage of one of the batteries in the battery pack is too high, the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack is cut off. Only when the voltage of all the batteries in the battery pack is lower than a certain set value, that is, it proves that all the batteries in the battery pack are normal, the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack is connected. The number of the balancing control modules in this embodiment is consistent with the number of batteries in the connected battery pack. Each balancing control module determines whether the battery has completed charging by detecting the voltage of the battery connected to it. When the judgment result is that the battery has completed charging, the positive and negative electrodes of the battery are short-circuited without affecting the continued charging of other batteries, thereby ensuring the balanced charging of each battery in the battery pack. The overcharge protection module in this embodiment serves as the second-level protection circuit for charging the battery pack. It determines whether each battery is overcharged according to the potential of each connection point interface. When the judgment result is that a battery is overcharged, the positive electrode interface of the battery pack is short-circuited with the charging negative electrode interface, thereby short-circuiting the entire battery pack and stopping its charging process to protect the battery pack. In this embodiment, the combination of the charging control module and the overcharge protection module realizes a double-layer protection function for the battery pack charging process, thereby improving the reliability and safety of the battery pack during the charging process.

[0035] Reference Figure 2In this embodiment, the charging control module includes a charging control chip of model S8254A, a switch tube Q1 and a switch tube Q2. The charging control chip is configured with a charging control terminal, a discharging control terminal and a plurality of voltage detection terminals. Each of the voltage detection terminals of the charging control chip is connected to each of the connection point interfaces in a one-to-one correspondence. The charging control terminal of the charging control chip is connected to the gate of the switch tube Q1, the discharging control terminal of the charging control chip is connected to the gate of the switch tube Q2, the source of the switch tube Q1 is connected to the charging positive electrode interface, the drain of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the positive electrode interface of the battery pack. In this embodiment, the charging control module is not only configured with a charging protection function, but also with a discharging protection function. This type of charging control chip determines whether an abnormality occurs according to the voltage of each battery during the charging and discharging process of the battery pack, and controls the switch tube Q1 to disconnect to cut off the charging process when an abnormal condition occurs, and controls the switch tube Q2 to cut off the discharging process. Of course, this embodiment is not limited to the charging control chip of the described model, and any charging control chip that can achieve similar functions falls within the protection scope of this application.

[0036] In this embodiment, the balance control module includes a balance control chip of model MM3513 and a switch tube Q3. The balance control chip is configured with two potential detection terminals and an output control terminal. The two potential detection terminals of the balance control chip are connected to two adjacent connection point interfaces in a one-to-one correspondence. The output control terminal of the balance control chip is connected to the gate of the switch tube Q3. The source and drain of the switch tube Q3 are respectively connected to the two adjacent connection point interfaces in a one-to-one correspondence.

[0037] In this embodiment, the overcharge protection module includes an overcharge protection chip model HY2131 and a switch tube Q4. The overcharge protection chip is configured with a charging output terminal and multiple voltage input terminals. The voltage input terminal of the overcharge protection chip is connected one-to-one with each of the connection point interfaces. The charging output terminal of the overcharge protection chip is connected to the gate of the switch tube Q4. The source and drain of the switch tube Q4 are connected one-to-one with the positive electrode interface of the battery pack and the negative charging electrode interface.

[0038] Furthermore, in this embodiment, the overcharging protection module also includes a switch tube Q5, the charging output end of the overcharging protection chip is connected to the gate of the switch tube Q5, the source of the switch tube Q5 is connected to the charging negative electrode interface, the drain of the switch tube Q5 is respectively connected to the gate of the switch tube Q4 and the positive electrode interface of the battery pack, and the source and drain of the switch tube Q4 are connected to the charging negative electrode interface and the negative electrode interface of the battery pack in a one-to-one correspondence.

[0039] The overcharge protection module in this embodiment realizes a dual protection mechanism of the overcharge protection module through the settings of the switch tube Q4 and the switch tube Q5. When the battery pack is not overcharged during the charging process, the overcharge protection chip controls the switch tube Q5 to be turned off. Since the gate of the switch tube Q4 is connected to the positive electrode interface of the battery pack, the switch tube Q4 is in the on state. When the battery pack is overcharged during the charging process, the overcharge protection chip controls the switch tube Q5 to be turned on, so that the positive electrode interface of the battery pack is short-circuited with the charging negative electrode interface through the switch tube Q5, and at the same time, the switch tube Q4 is turned off to prevent the charging current from entering the battery pack again.

[0040] The present application also discloses a battery device, a first embodiment of which includes the first embodiment of the battery double-layer protection circuit described above and a plurality of batteries, wherein two adjacent connection point interfaces are defined as a loading position, and each of the batteries is connected to each of the loading positions one by one.

[0041] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A battery double-layer protection circuit, characterized in that: include: Positive charging port, used to connect to the positive power supply port of an external charger; A negative charging port, used to connect to the negative power supply port of an external charger; A connection point interface, which is provided with multiple ones, and is used to connect with the positive and negative electrodes of each battery in the battery pack in a one-to-one correspondence. The connection point interface connected to the positive electrode of the battery pack is defined as the battery pack positive electrode interface, and the connection point interface connected to the negative electrode of the battery pack is defined as the battery pack negative electrode interface. The charging negative electrode interface is connected to the battery pack negative electrode interface; A charging control module, connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces respectively, and used to control the electrical connection between the charging positive electrode interface and the positive electrode interface of the battery pack according to the potential of each of the connection point interfaces; A balance control module, which is provided with a plurality of balance control modules, each of which is connected to two adjacent connection point interfaces, and is used to control the electrical connection of the two adjacent connection point interfaces according to the potential of the two adjacent connection point interfaces; an overcharge protection module, connected to the charging positive electrode interface, the charging negative electrode interface and each of the connection point interfaces respectively, and used to control the electrical connection between the positive electrode interface of the battery pack and the charging negative electrode interface according to the potential of each of the connection point interfaces; The charging control module includes a charging control chip and a switch tube Q1. The charging control chip is configured with a charging control terminal and a plurality of voltage detection terminals. Each of the voltage detection terminals of the charging control chip is connected to each of the connection point interfaces in a one-to-one correspondence. The charging control terminal of the charging control chip is connected to the gate of the switch tube Q1. The source of the switch tube Q1 is connected to the charging positive electrode interface. The drain of the switch tube Q1 is connected to the positive electrode interface of the battery pack. The balance control module includes a balance control chip and a switch tube Q3. The balance control chip is configured with two potential detection terminals and an output control terminal. The two potential detection terminals of the balance control chip are connected to two adjacent connection point interfaces in a one-to-one correspondence. The output control terminal of the balance control chip is connected to the gate of the switch tube Q3. The source and drain of the switch tube Q3 are connected to the two adjacent connection point interfaces in a one-to-one correspondence. The overcharge protection module includes an overcharge protection chip and a switch tube Q4. The overcharge protection chip is configured with a charging output terminal and a plurality of voltage input terminals. The voltage input terminal of the overcharge protection chip is connected to each of the connection point interfaces in a one-to-one correspondence. The charging output terminal of the overcharge protection chip is connected to the gate of the switch tube Q4. The source and drain of the switch tube Q4 are connected to the positive electrode interface of the battery pack and the negative charging electrode interface in a one-to-one correspondence. The overcharge protection module also includes a switch tube Q5, the charging output end of the overcharge protection chip is connected to the gate of the switch tube Q5, the source of the switch tube Q5 is connected to the charging negative electrode interface, the drain of the switch tube Q5 is respectively connected to the gate of the switch tube Q4 and the positive electrode interface of the battery pack, and the source and drain of the switch tube Q4 are connected to the charging negative electrode interface and the negative electrode interface of the battery pack in a one-to-one correspondence.

2. A battery double-layer protection circuit according to claim 1, characterized in that: The charging control module also includes a switch tube Q2, and the charging control chip is also configured with a discharge control end. The discharge control end of the charging control chip is connected to the gate of the switch tube Q2, the drain of the switch tube Q1 is connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the positive electrode interface of the battery pack.

3. A battery device, characterized in that: The invention comprises the battery double-layer protection circuit as described in any one of claims 1 to 2 and a plurality of batteries, wherein two adjacent connection point interfaces are defined as a loading position, and each of the batteries is connected to each of the loading positions one by one.

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