Control chip, circuit, management system, battery system and module for converting secondary batteries to dry batteries
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2026-08-14
AI Technical Summary
[0003]本实用新型实施例提供一种二次电池转干电池控制芯片、电路、管理系统、电池系统及模组，以解决现有的二次电池转干电池成本较高的问题
[0023]本实用新型实施例提供二次电池转干电池控制芯片、电路、管理系统、电池系统及模组，二次电池转干电池控制芯片，包括电池连接端、输入输出端、接地端和第一晶体管；电池连接端用于连接二次电池电路；输入输出端和接地端用于与外部的电池管理系统串联；第一晶体管的第一端耦合至电池连接端和输入输出端，第一晶体管的第二端接地，用于在二次电池电路异常放电时处于导通状态，从而在二次电池电路异常放电时，通过导通状态的第一晶体管传输二次电池转干电池控制芯片与外部的电池管理系统之间的大部分的回路电流，从而避免回路电流损坏二次电池转干电池控制芯片，同时减少成本提高集成度。
Smart Images
Figure CN224637242U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a control chip, circuit, management system, battery system and module for converting a secondary battery to a dry battery. Background Technology
[0002] Lithium-ion to dry cell batteries are a new type of dry cell battery that stores and releases lithium ions using an electrochemical reaction. When a large load is required, multiple lithium-ion to dry cell batteries are typically connected in series. However, when lithium-ion to dry cell batteries are connected in series to power a large load, if the control chip in one of the series of batteries malfunctions and stops working, a significant loop current will still exist in the control chip after the malfunction, potentially burning out the components within that chip. Therefore, a Schottky diode needs to be connected to the output terminals of the control chip to protect it after it enters the malfunction protection state. For example... Figure 1 As shown, when the first lithium-to-dry battery control chip malfunctions and stops working, the loop current flows out through the Schottky diode D1, bypassing the lithium-to-dry battery control chip, thus protecting it. However, adding a Schottky diode increases cost, and the battery control board in the lithium-to-dry battery is relatively small; adding a component would affect its layout and heat dissipation. Utility Model Content
[0003] This utility model provides a secondary battery to dry battery conversion control chip, circuit, management system, battery system and module to solve the problem of high cost of existing secondary battery to dry battery conversion.
[0004] A secondary battery to dry battery control chip includes a battery connection terminal, an input / output terminal, a ground terminal, and a first transistor;
[0005] The battery connection terminal is used to connect to the secondary battery circuit;
[0006] The input / output terminals and the ground terminal are used to connect in series with an external battery management system;
[0007] The first terminal of the first transistor is coupled to the battery connection terminal and the input / output terminal, and the second terminal of the first transistor is grounded, so as to be in the conducting state when the secondary battery circuit is abnormally discharged.
[0008] Furthermore, the secondary battery to dry battery control chip also includes a temperature detection circuit, a main control circuit, and a drive circuit;
[0009] The temperature detection circuit is used to detect the internal ambient temperature of the secondary battery to dry battery control chip;
[0010] The main control circuit is connected to the temperature detection circuit and is used to output a first control signal when the internal ambient temperature is abnormal.
[0011] The driving circuit is connected to the main control circuit and the third terminal of the first transistor, and is used to drive the first transistor to be in a conducting state according to the first control signal.
[0012] Furthermore, the secondary battery to dry battery control chip also includes a second transistor;
[0013] The first terminal of the second transistor is connected to the battery connection terminal, and the second terminal of the second transistor is connected to the first terminal of the first transistor and the input / output terminal.
[0014] The driving circuit is connected to the third terminal of the second transistor and is used to drive the first transistor and the second transistor to conduct alternately when the secondary battery circuit is discharging normally, so as to reduce the discharge voltage output by the secondary battery circuit.
[0015] Furthermore, the first transistor is an NMOS transistor; the second transistor is a PMOS transistor.
[0016] A control circuit for converting a secondary battery to a dry cell battery includes a first inductor, a first capacitor, and the aforementioned control chip for converting a secondary battery to a dry cell battery.
[0017] The secondary battery to dry battery control chip also includes a switch control terminal; the first terminal of the first transistor is connected to the switch control terminal, and the switch control terminal is connected to the input / output terminal through the first inductor.
[0018] The first end of the first capacitor is connected to the first inductor and the input / output terminal, and the second end of the first capacitor is connected to the ground terminal of the secondary battery to dry battery control chip.
[0019] A battery management system includes a positive terminal, a negative terminal, and a control circuit for converting a secondary battery to a dry cell battery as described above.
[0020] The positive terminal is connected to the input / output terminal of the secondary battery to dry battery control chip, and the negative terminal is connected to the ground terminal of the secondary battery to dry battery control chip.
[0021] A battery system includes a plurality of the above-described battery management systems; the positive and negative terminals of the plurality of battery management systems are connected in series.
[0022] A battery module comprising the aforementioned battery system.
[0023] This utility model provides a secondary battery to dry battery control chip, circuit, management system, battery system, and module. The secondary battery to dry battery control chip includes a battery connection terminal, an input / output terminal, a ground terminal, and a first transistor. The battery connection terminal is used to connect to the secondary battery circuit. The input / output terminal and the ground terminal are used to connect in series with an external battery management system. The first terminal of the first transistor is coupled to the battery connection terminal and the input / output terminal, and the second terminal of the first transistor is grounded. It is used to be in a conducting state when the secondary battery circuit is abnormally discharged. Thus, when the secondary battery circuit is abnormally discharged, most of the loop current between the secondary battery to dry battery control chip and the external battery management system is transmitted through the conducting first transistor, thereby avoiding damage to the secondary battery to dry battery control chip by the loop current, while reducing costs and improving integration. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is an application scenario diagram of the secondary battery to dry battery control chip in the background technology of this utility model;
[0026] Figure 2 This is a circuit diagram of a secondary battery to dry battery control chip in one embodiment of this utility model;
[0027] Figure 3 This is another circuit diagram of the secondary battery to dry battery control chip in one embodiment of this utility model.
[0028] In the diagram: 1. Secondary battery to dry battery control chip; 11. Temperature detection circuit; 12. Main control circuit; 13. Drive circuit. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.
[0030] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.
[0031] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.
[0032] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.
[0033] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.
[0034] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.
[0035] This embodiment provides a secondary battery to dry cell control chip 1, applied in a battery management system. The battery management system includes a secondary battery to dry cell control circuit. The secondary battery to dry cell control circuit includes the secondary battery to dry cell control chip and peripheral circuitry disposed around the secondary battery to dry cell control chip.
[0036] As an example, the secondary battery to dry battery control chip 1 includes a current setting terminal ISET, a battery connection terminal BAT, an input / output terminal Vin / Vout, a switch control terminal SW, a ground terminal GND, and an LED connection terminal LED. The current setting terminal ISET is grounded through a current-limiting resistor R1. The battery connection terminal BAT is used to connect to the secondary battery circuit and is grounded through an energy storage capacitor C2. An LED is directly mounted on the battery connection terminal BAT and the LED connection terminal LED to indicate the operating status of the secondary battery to dry battery control chip 1. The input / output terminal Vin / Vout and the switch control terminal SW of the secondary battery to dry battery control chip 1 are connected to a first inductor L1, and the input / output terminal Vin / Vout and the ground terminal GND are connected to a first capacitor C1. The first inductor L1 and the first capacitor C1 work together with the secondary battery to dry battery control chip 1 to achieve switching voltage reduction.
[0037] The secondary batteries include lithium-ion batteries or sodium-ion batteries.
[0038] In related technologies, when multiple rechargeable to dry cell batteries are used in series, a Schottky diode is directly placed at the input / output terminals Vin / Vout and the ground terminal GND of the control circuit of each rechargeable to dry cell battery control chip 1. This is to prevent the control chip 1 from being burned out by high current after entering abnormal protection. However, this method increases cost, and the battery control board in the rechargeable to dry cell battery is small, so adding a component affects its layout and heat dissipation.
[0039] This embodiment provides a secondary battery to dry battery control chip 1, including a battery connection terminal BAT, an input / output terminal Vin / Vout, a ground terminal GND, and a first transistor K1; the battery connection terminal BAT is used to connect to the secondary battery circuit; the input / output terminal Vin / Vout and the ground terminal GND are used to connect in series with an external battery management system; the first terminal of the first transistor K1 is coupled to the battery connection terminal BAT and the input / output terminal Vin / Vout, and the second terminal of the first transistor K1 is grounded, so as to be in a conducting state when the secondary battery circuit is abnormally discharged.
[0040] The input / output terminals Vin / Vout are used for charging and discharging the secondary battery circuit.
[0041] For example, the abnormal discharge includes an abnormal internal ambient temperature during the discharge of the secondary battery to dry battery control chip 1. As an example, the secondary battery to dry battery control chip includes a temperature detection circuit 11, a main control circuit 12, a drive circuit 13, and a step-down circuit. The temperature detection circuit 11 is connected to the main control circuit 12 and is used to collect the internal ambient temperature of the secondary battery to dry battery control chip 1 and input this internal ambient temperature to the main control circuit 12. The input terminal of the step-down circuit is connected to the battery connection terminal BAT, and the output terminal of the step-down circuit is connected to the input / output terminal Vin / Vout, used to step down the battery voltage of the secondary battery circuit to simulate dry battery discharge. The main control circuit 12 is connected to the temperature detection circuit 11, the drive circuit 13, and the step-down circuit. It is used to determine whether the internal ambient temperature of the secondary battery to dry battery control chip 1 is too high based on a preset temperature threshold and the internal ambient temperature. When the internal ambient temperature is too high, the main control circuit 12 controls the step-down circuit in the secondary battery to dry battery control chip 1 to stop working. However, a large loop current will still form between the battery connection terminal BAT, the input / output terminals Vin / Vout, the step-down circuit, and the external battery management system, thereby damaging the transistor in the step-down circuit of the secondary battery to dry battery control chip 1. In this embodiment, the main control circuit 12 is also used to output a first control signal to the drive circuit 13. Based on the first control signal, the drive circuit 13 controls the first transistor K1 to be in a conducting state when the secondary battery circuit is abnormally discharged. This allows most of the loop current to flow through the conducting first transistor K1, thus preventing the loop current from flowing to the body diode of the transistor in the step-down circuit, thereby protecting the secondary battery to dry battery control chip 1, improving integration, and reducing cost.
[0042] In this embodiment, the secondary battery to dry battery control chip 1 includes a battery connection terminal BAT, an input / output terminal Vin / Vout, a ground terminal GND, and a first transistor K1. The battery connection terminal BAT is used to connect to the secondary battery circuit. The input / output terminal Vin / Vout and the ground terminal GND are used to connect in series with an external battery management system. The first terminal of the first transistor K1 is coupled to the battery connection terminal BAT and the input / output terminal Vin / Vout, and the second terminal of the first transistor K1 is grounded. It is used to be in a conducting state when the secondary battery circuit is abnormally discharged. Thus, when the secondary battery circuit is abnormally discharged, most of the loop current between the secondary battery to dry battery control chip 1 and the external secondary battery to dry battery is transmitted through the conducting state of the first transistor K1, thereby avoiding damage to the secondary battery to dry battery control chip 1 by the loop current, while reducing cost and improving integration.
[0043] In one embodiment, the secondary battery to dry battery control chip 1 further includes a drive circuit 13; the drive circuit 13 is connected to the main control circuit 12 and the third terminal of the first transistor K1, and is used to drive the first transistor K1 to a conducting state according to the first control signal output by the main control circuit 12. In this example, the drive circuit 13 can be a transistor drive circuit known in the art, and is not limited thereto.
[0044] In one embodiment, the secondary battery to dry battery control chip 1 further includes a second transistor K2; the first terminal of the second transistor K2 is connected to the battery connection terminal BAT, and the second terminal of the second transistor K2 is connected to the first terminal of the first transistor K1 and the input / output terminal Vin / Vout; the driving circuit 13 is connected to the third terminal of the second transistor K2 and is used to drive the first transistor K1 and the second transistor K2 to conduct alternately when the secondary battery circuit is discharging normally, so as to reduce the discharge voltage output by the secondary battery circuit.
[0045] In this embodiment, the first transistor K1, the second transistor K2, and the driving circuit 13 are used to form a step-down circuit. When the secondary battery circuit is abnormally discharged, the driving circuit 13 drives the first transistor K1 to conduct, so that most of the loop current flows through the conducting first transistor K1. When the secondary battery circuit is normally discharged, the driving circuit 13 drives the first transistor K1 and the second transistor K2 to conduct alternately, thereby cooperating with the first inductor L1 and the first capacitor C1 in the peripheral circuit of the secondary battery to dry battery control chip to achieve step-down processing. Thus, by reusing the first transistor K1 in the step-down circuit of the secondary battery to dry battery control chip 1, the cost is further reduced.
[0046] Furthermore, the first transistor K1 and the second transistor K2 can be either MOSFETs or transistors. Preferably, the first transistor K1 and the second transistor K2 are MOSFETs to ensure a faster switching speed.
[0047] In one embodiment, the first transistor K1 is an NMOS transistor; the second transistor K2 is a PMOS transistor.
[0048] For example, the first terminal of the first transistor K1 or the second transistor K2 is the source, the second terminal is the drain, and the third terminal is the gate.
[0049] This embodiment provides a control circuit for converting a secondary battery to a dry cell battery, including a first inductor L1, a first capacitor C1, and the aforementioned secondary battery to dry cell battery control chip 1; the secondary battery to dry cell battery control chip 1 also includes a switch control terminal SW; the first terminal of the first transistor K1 is connected to the switch control terminal SW, and the switch control terminal SW is connected to the input / output terminal Vin / Vout through the first inductor L1; the first terminal of the first capacitor C1 is connected to the first inductor L1 and the input / output terminal Vin / Vout, and the second terminal of the first capacitor C1 is connected to the ground terminal GND of the secondary battery to dry cell battery control chip 1.
[0050] As an example, the first inductor L1, the first capacitor C1, and the step-down circuit in the secondary battery to dry battery control chip 1 work together to achieve voltage reduction of the battery. Exemplarily, the main control circuit 12 controls the drive circuit 13 to drive the first transistor K1 and the second transistor K2 in the step-down circuit to conduct alternately according to the output voltage of the input / output terminal Vin / Vout and the preset reference voltage. Through the energy storage and discharge of the first inductor L1 and the first capacitor C1, the voltage reduction is achieved, and the output voltage of the input / output terminal Vin / Vout is reduced to the preset reference voltage.
[0051] This embodiment provides a battery management system, including a positive terminal, a negative terminal, and the aforementioned control circuit for converting a secondary battery to a dry cell battery; the positive terminal is connected to the input / output terminal Vin / Vout of the secondary battery to dry cell battery control chip 1, and the negative terminal is connected to the ground terminal GND of the secondary battery to dry cell battery control chip 1.
[0052] This embodiment provides a battery system including multiple battery management systems as described above; the positive and negative terminals of the multiple battery management systems are connected in series.
[0053] This embodiment provides a battery module, including the battery system described above.
[0054] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.
Claims
1. A secondary battery to dry cell control chip, characterized by, Includes battery connection terminal, input / output terminal, ground terminal and first transistor; The battery connection terminal is used to connect to the secondary battery circuit; The input / output terminals and the ground terminal are used to connect in series with an external battery management system; The first terminal of the first transistor is coupled to the battery connection terminal and the input / output terminal, and the second terminal of the first transistor is grounded, so as to be in the conducting state when the secondary battery circuit is abnormally discharged.
2. The secondary battery to dry cell control chip of claim 1, wherein, The secondary battery to dry battery control chip also includes a temperature detection circuit, a main control circuit, and a drive circuit. The temperature detection circuit is used to detect the internal ambient temperature of the secondary battery to dry battery control chip; The main control circuit is connected to the temperature detection circuit and is used to output a first control signal when the internal ambient temperature is abnormal. The driving circuit is connected to the main control circuit and the third terminal of the first transistor, and is used to drive the first transistor to be in the conducting state according to the first control signal.
3. The secondary battery to dry cell control chip of claim 2, wherein, The secondary battery to dry battery control chip also includes a second transistor; The first terminal of the second transistor is connected to the battery connection terminal, and the second terminal of the second transistor is connected to the first terminal of the first transistor and the input / output terminal. The driving circuit is connected to the third terminal of the second transistor and is used to drive the first transistor and the second transistor to conduct alternately when the secondary battery circuit is discharging normally, so as to reduce the discharge voltage output by the secondary battery circuit.
4. The secondary battery to dry battery control chip according to claim 3, characterized in that, The first transistor is an NMOS transistor; the second transistor is a PMOS transistor.
5. A control circuit for converting a secondary battery to a dry cell battery, characterized in that, Includes a first inductor, a first capacitor, and a secondary battery to dry battery control chip as described in any one of claims 1 to 4; The secondary battery to dry battery control chip also includes a switch control terminal; the first terminal of the first transistor is connected to the switch control terminal, and the switch control terminal is connected to the input / output terminal through the first inductor. The first end of the first capacitor is connected to the first inductor and the input / output terminal, and the second end of the first capacitor is connected to the ground terminal of the secondary battery to dry battery control chip.
6. A battery management system, characterized in that, Includes a positive terminal, a negative terminal, and a control circuit for converting a secondary battery to a dry cell as described in claim 5; The positive terminal is connected to the input / output terminal of the secondary battery to dry battery control chip, and the negative terminal is connected to the ground terminal of the secondary battery to dry battery control chip.
7. A battery system, characterized in that, It includes multiple battery management systems as described in claim 6; the positive and negative terminals of the multiple battery management systems are connected in series.
8. A battery module, characterized in that, Includes the battery system as described in claim 7.