Battery module aging safety device and aging cabinet

Abstract

This invention provides a battery module aging safety device and aging cabinet. The device includes an optocoupler, a first resistor, a second resistor, and a switching unit. The positive input side of the optocoupler is connected in series with the first resistor and then to the positive terminal of the battery pack. The negative input side of the optocoupler is connected to the negative terminal of the battery pack. One end of the output side of the optocoupler is connected in series with the second resistor and then to the control terminal of the switching unit. The other end of the output side of the optocoupler is grounded. The input terminal of the switching unit is connected to the positive and negative terminals of the battery pack, and the output terminal of the switching unit is connected to the aging cabinet. The input terminal of the switching unit is normally open. When the positive and negative terminals of the battery pack are correctly connected to the optocoupler, the optocoupler drives the input terminal of the switching unit to close. This invention judges the correct connection of the positive and negative terminals of the battery pack, avoiding damage to the aging cabinet due to incorrect connection.

Description

Technical Field

[0001] This utility model belongs to the field of battery aging technology, specifically relating to a battery module aging safety device and aging cabinet. Background Technology

[0002] In the battery production, testing and maintenance process, the aging test of traditional battery packs is a key process to ensure their performance stability and service life. This process requires connecting the battery pack to a professional aging cabinet. Through the specific current and voltage signals output by the aging cabinet, the charge and discharge cycles of the battery pack during long-term use are simulated, thereby detecting the battery pack's core indicators such as capacity decay, voltage stability, and safety. However, in traditional operating modes, the connection between the battery pack and the aging cabinet mostly relies on manual connection. Operators need to physically connect the positive and negative terminals of the battery pack to the corresponding positive and negative interfaces on the aging cabinet panel. This connection method itself lacks effective foolproof design and is limited by the operating environment, such as simultaneous testing of multiple battery packs in the aging workshop, unclear or worn terminal markings, and operator fatigue. These factors make it very easy to make mistakes such as reversing the positive and negative terminals of the battery pack to the interfaces of the aging cabinet.

[0003] When the positive and negative terminals of the battery pack are incorrectly reversed and connected to the aging cabinet, a reverse conduction circuit will be instantly formed inside the aging cabinet. If the battery pack is of high voltage and high capacity, the instantaneous reverse current will be generated when it is connected in reverse, which will far exceed the protection threshold of the aging cabinet. This current will directly impact the core components inside the aging cabinet, and in severe cases, it will also cause faults such as the copper foil of the PCB board inside the aging cabinet burning out and the capacitor bulging and exploding. Summary of the Invention

[0004] To address the shortcomings of the prior art, this utility model provides a battery module aging safety device and aging cabinet, which judges the correct connection of the positive and negative terminals of the battery pack and avoids damage to the aging cabinet due to incorrect connection.

[0005] In one aspect, this utility model provides a battery module aging safety device for connecting a battery pack to an aging cabinet. The device includes an optocoupler, a first resistor, a second resistor, and a switching unit. The positive input side of the optocoupler is connected to the positive terminal of the battery pack after being connected in series with the first resistor, the negative input side of the optocoupler is connected to the negative terminal of the battery pack, one end of the output side of the optocoupler is connected to the control terminal of the switching unit after being connected in series with the second resistor, and the other end of the output side of the optocoupler is grounded. The input terminal of the switching unit is used to connect to the positive and negative terminals of the battery pack, and the output terminal of the switching unit is connected to the aging cabinet. The input terminal of the switching unit is normally open. When the positive and negative terminals of the battery pack are correctly connected to the optocoupler, the optocoupler drives the input terminal of the switching unit to close.

[0006] In some implementations, the optocoupler is a phototransistor type optocoupler; One end of the output side of the optocoupler is a collector, and the collector is connected in series with the second resistor and then connected to the control terminal of the switching unit. The other end of the output side of the optocoupler is the emitter, and the emitter is grounded.

[0007] In some implementations, the switching unit is a relay, and the relay has a contact one and a contact two; One end of the output side of the optocoupler is connected in series with the second resistor and then connected to the coil input terminal of the relay, and the coil output terminal of the relay is grounded; Contact one is used to connect or disconnect the positive terminal of the battery pack and the aging cabinet, and contact two is used to connect or disconnect the negative terminal of the battery pack and the aging cabinet.

[0008] In some implementations, a display device is connected in series with the coil output of the relay. The display device is used to show the correct connection between the positive and negative terminals of the battery pack and the optocoupler, so that the operator can understand the correct or incorrect connection of the battery pack.

[0009] In some implementations, the display device is an LED light, which is easy to obtain and apply, and also easy to be discovered.

[0010] In some implementations, a fuse is connected in series between the first contact and the aging cabinet to provide overcurrent protection for the circuit.

[0011] In some implementations, a temperature switch unit is also included; The temperature switch unit is used to connect or disconnect the battery pack from the optocoupler, thereby providing over-temperature protection.

[0012] In some implementations, the temperature switch unit includes a temperature switch one and a temperature switch two; The temperature switch is connected to the terminal of the positive terminal of the battery pack. The second temperature switch is connected to the terminal of the negative terminal line of the battery pack.

[0013] In some implementations, there are multiple battery packs; The multiple battery packs are respectively connected to different optocouplers and different switching units.

[0014] On the other hand, the present invention provides an aging cabinet, including the battery module aging safety device described in any of the above claims.

[0015] In summary, this utility model has at least the following advantages: 1. This utility model provides a battery module aging safety device. An optocoupler and a switching unit are installed between the battery pack and the aging cabinet. The positive input side of the optocoupler is connected to the positive terminal of the battery pack after being connected in series with a first resistor, and the negative input side is connected to the negative terminal of the battery pack. One end of the output side of the optocoupler is connected to the control terminal of the switching unit after being connected in series with a second resistor, and the other end of the output side of the optocoupler is grounded. The input terminal of the switching unit is connected to the positive and negative terminals of the battery pack, and the output terminal of the switching unit is connected to the aging cabinet. Thus, when the positive and negative terminals of the battery pack are correctly connected to the optocoupler, the optocoupler operates, thereby driving the input terminal of the switching unit to close through one side of the optocoupler's output terminal, thus connecting the battery pack... To the aging cabinet; when the positive and negative terminals of the battery pack are incorrectly connected to the optocoupler, the optocoupler will not work. Since the input terminal of the switching unit is normally open, the battery pack is not connected to the aging cabinet, effectively avoiding damage to the aging cabinet due to incorrect connection of the positive and negative terminals of the battery pack, thus protecting the aging cabinet; in addition, by adding a temperature switch unit, when one or two screws on the positive and negative terminals of the battery pack are not tightened, the terminals will heat up during the charging and discharging process. When the temperature reaches the protection temperature of the temperature switch unit, the temperature switch unit will disconnect, causing the optocoupler to stop working, and the battery pack will not be connected to the aging cabinet, thus protecting the battery pack.

[0016] 2. The aging cabinet provided by this utility model, after applying the above-mentioned battery module aging safety device, will not conduct electricity between the battery pack and the aging cabinet when the positive and negative terminals of the battery pack are connected incorrectly, thereby effectively avoiding the problem of damage to the aging cabinet caused by incorrect connection of the positive and negative terminals of the battery pack, and playing a protective role for the aging cabinet. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a battery module aging safety device provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a battery module aging safety device provided in Embodiment 2 of this utility model; Figure 3 A schematic diagram of the aging cabinet provided in Embodiment 3 of this utility model; Marked in the image: 10. Battery module aging safety device; 20. Aging cabinet; 100. Switching unit. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more comprehensive description will be given below in conjunction with the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0019] Please refer to the diagrams, where the same component symbols represent the same components. The principles of this application are illustrated by way of example implementation in a suitable computing environment. The following description is based on the specific embodiments of this application exemplified, and should not be construed as limiting other specific embodiments not detailed herein.

[0020] As used herein, the term "module" can refer to a software or hardware object that executes on the computing system. The various components, modules, engines, and services described herein can be implementations on the computing system. The apparatuses and methods described herein can be implemented in software or hardware, both of which are within the scope of this application.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections, electrical connections, or connections that allow communication between them; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components or interactive relationships between two components.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0024] Example 1: Please see Figure 1A battery module aging safety device 10 is used to connect the battery pack to the aging cabinet. It simulates the charge and discharge cycle of the battery pack during long-term use by using specific current and voltage signals output by the aging cabinet, thereby detecting the core indicators of the battery pack such as capacity decay, voltage stability, and safety.

[0025] The battery module aging safety device 10 includes an optocoupler U1, a first resistor R11, a second resistor R12, and a switching unit 100.

[0026] The positive input side of optocoupler U1 is connected to the positive terminal of battery pack B1 after being connected in series with the first resistor R11, and the negative input side of optocoupler U1 is connected to the negative terminal of battery pack B1. One end of the output side of optocoupler U1 is connected to the control terminal of the switching unit after being connected in series with the second resistor R12, and the other end of the output side of optocoupler U1 is grounded.

[0027] This part of the circuit uses optocoupler U1 to achieve electrical isolation between battery pack B1 and the subsequent switching unit 100. When the positive and negative terminals of battery pack B1 are correctly connected to the positive and negative input sides of optocoupler U1, respectively, the current path is: positive terminal of battery pack B1 - positive input side of optocoupler U1 - negative input side of optocoupler U1 - negative terminal of battery pack B1, forming a complete loop. The first resistor R11 limits the conduction current of the LED on the positive input side of optocoupler U1 to prevent overcurrent burnout. The specific resistor R11 can be matched according to the optocoupler U1 datasheet. When the LED on the positive input side of optocoupler U1 illuminates, it drives the output side of optocoupler U1 to conduct. One end of the output side of the optocoupler U1 is connected to the control terminal of the switching unit 100 via the second circuit R12, and the other end of the output side of the optocoupler U1 is grounded. When the optocoupler U1 is turned on, the control terminal of the switching unit 100 is grounded through the output side of the optocoupler and obtains a drive signal to trigger the switching unit 100 to turn on, so that the switching unit 100 is turned on. When the optocoupler U1 is turned off, the control terminal of the switching unit 100 does not obtain a drive signal and remains in the off state.

[0028] The input terminal of the switching unit 100 is used to connect the positive and negative terminals of the battery pack B1, and the output terminal of the switching unit 100 is connected to the aging cabinet. The input terminal of the switching unit 100 is normally open. When the positive and negative terminals of the battery pack B1 are correctly connected to the optocoupler, the optocoupler U1 drives the input terminal of the switching unit 100 to close.

[0029] Specifically, when the positive and negative terminals of battery pack B1 are correctly connected to optocoupler U1, optocoupler U1 conducts, thereby driving switch unit 100 to conduct, realizing the connection between battery pack B1 and aging cabinet, and starting the aging test of battery pack B1.

[0030] When the positive and negative terminals of battery pack B1 are reverse-connected to the optocoupler, the LED on the input side of optocoupler U1 is reverse-biased and does not conduct, and the output side of optocoupler is cut off, thereby keeping the switching unit 100 disconnected. The battery pack B1 is not connected to the aging cabinet circuit, thus avoiding damage to the core components of the aging cabinet caused by reverse connection from the source.

[0031] When battery pack B1 is not connected, optocoupler U1 is cut off and switch unit 100 is disconnected to prevent the aging cabinet from running under no-load conditions.

[0032] In some implementations, optocoupler U1 is a phototransistor type optocoupler; one end of the output side of optocoupler U1 is the collector, and the collector is connected in series with the second resistor R12 and then connected to the control terminal of the switching unit 100; the other end of the output side of optocoupler U1 is the emitter, and the emitter is grounded.

[0033] The input and output sides of the phototransistor type optocoupler are not directly electrically connected. The control logic is transmitted only through optical signals. When applied to this device, it can effectively block the high voltage of the battery pack B1 side from entering the low voltage control terminal, prevent the switch unit 100 from being broken down, and prevent interference from causing the switch unit to be falsely triggered.

[0034] In some embodiments, the switching unit 100 is a relay K1, which has a contact one and a contact two; one end of the output side of the optocoupler U1 is connected in series with a second resistor R12 and then connected to the coil input terminal of the relay K1, and the coil output terminal of the relay K1 is grounded; the first contact is used to connect or disconnect the positive terminal of the battery pack B1 and the aging cabinet, and the second contact is used to connect or disconnect the negative terminal of the battery pack B1 and the aging cabinet.

[0035] Here, the switching unit 100 uses a relay K1, which can be adapted to the low-voltage drive signal of the optocoupler U1. The output side of the optocoupler U1 is a low-voltage control signal, and the driving requirements of the relay K1 coil are highly matched with the output characteristics of the optocoupler U1. No additional amplification circuit is needed. The relay K1 coil can be directly driven by the output of the optocoupler U1. Moreover, the mechanical contacts of the relay have high rated current and voltage characteristics and can directly carry high-power loads. If electronic switches such as MOSFETs or transistors are selected, additional heat sinks and overcurrent protection circuits are required, which greatly increases the cost and complexity.

[0036] When optocoupler U1 is turned on, current flows through the coil of relay K1, causing the coil to generate a magnetic field, which attracts the internal armature and drives contact one and contact two to operate, thereby controlling the closing or opening of contact one and contact two.

[0037] In this example, when optocoupler U1 is turned on, current flows through the coil of relay K1, and the coil generates a magnetic field, which attracts the internal armature to close contacts one and two, thus connecting the positive and negative terminals of the battery pack to the aging cabinet.

[0038] In some implementations, a display device LED1 is connected in series with the coil output of the relay. The display device LED1 is used to show the correct connection between the positive and negative terminals of the battery pack B1 and the optocoupler U1, so that the operator can understand the correct or incorrect connection of the battery pack B1.

[0039] Furthermore, the display device is an LED light, which is easy to obtain and apply, and also easy to spot.

[0040] When the positive and negative terminals of battery pack B1 are correctly connected to optocoupler U1, optocoupler U1 conducts, thereby driving the switching unit to conduct, realizing the connection between battery pack B1 and aging cabinet. At the same time, display device LED1 lights up to indicate that the connection is correct.

[0041] In some implementations, a fuse F1 is connected in series between contact one and the aging cabinet, and the fuse F1 provides overcurrent protection for the circuit.

[0042] Specifically, when the current in the circuit is within the rated current range of fuse F1, the heat generated by fuse F1 can be maintained through its own heat dissipation to keep it stable and in a conductive state, without affecting the normal operation of the aging cabinet; when a large current exceeding the rated current of fuse F1 appears in the circuit, fuse F1 will generate a large amount of heat in a short time, and the temperature will rise rapidly to the melting point, the conductor will melt, directly cutting off the circuit between the switching unit and the aging cabinet, preventing the excessive current from continuing to flow through the core components of the aging cabinet.

[0043] This utility model provides a battery module aging safety device. It involves setting up an optocoupler and a switching unit between the battery pack and the aging cabinet. The positive input side of the optocoupler is connected to the positive terminal of the battery pack via a first resistor in series, and the negative input side is connected to the negative terminal of the battery pack. One end of the optocoupler's output side is connected to the control terminal of the switching unit via a second resistor in series, and the other end of the optocoupler's output side is grounded. The input terminal of the switching unit is connected to the positive and negative terminals of the battery pack, and the output terminal of the switching unit is connected to the aging cabinet. Thus, when the positive and negative terminals of the battery pack are correctly connected to the optocoupler, the optocoupler operates, driving the input terminal of the switching unit to close via the output terminal of the optocoupler, connecting the battery pack to the aging cabinet. When the positive and negative terminals of the battery pack are incorrectly connected to the optocoupler, the optocoupler does not operate. Since the input terminal of the switching unit is normally open, the battery pack is not connected to the aging cabinet, effectively preventing damage to the aging cabinet due to incorrect positive and negative battery connections, and thus protecting the aging cabinet.

[0044] Example 2: This embodiment is a further optimization based on Embodiment 1. Please refer to the following: Figure 1 Based on the above, refer to Figure 2 .

[0045] In this embodiment, the battery module aging safety device 10 also includes a temperature switch unit; the temperature switch unit is used to connect or disconnect the battery pack B1 and the optocoupler U1 to provide over-temperature protection.

[0046] Furthermore, the temperature switch unit includes a first temperature switch FT11 and a second temperature switch FT12; the first temperature switch FT11 is connected to the terminal of the positive terminal of the battery pack B1; the second temperature switch FT12 is connected to the terminal of the negative terminal of the battery pack B1.

[0047] The built-in thermistors of temperature switch FT11 and temperature switch FT12 will undergo physical deformation or sudden change in resistance with temperature changes. When the temperature reaches the preset action threshold, the switch contacts will automatically open; when the temperature drops to the reset threshold, the contacts will automatically close.

[0048] If there are problems such as poor contact, loose crimping, or foreign matter accumulation at the terminal head, the contact resistance of the terminal head will increase. According to Joule's law, a large amount of heat will be generated when current passes through a large resistance, causing the terminal head temperature to rise sharply. Here, temperature switch FT11 and temperature switch FT12 are used to monitor the temperature of the positive and negative terminals in real time. When the temperature rises abnormally, the circuit is automatically cut off to avoid the risk of fire, battery damage, or equipment burnout caused by overheating of the terminal head.

[0049] In some implementations, there are multiple battery packs, each connected to different optocouplers and different switching units.

[0050] For example, multiple battery packs include battery pack B1, battery pack B2, and battery pack Bn, etc., and the corresponding optocouplers include optocoupler U1, optocoupler U2, and optocoupler Un, etc., and the corresponding switching units include relay K1, relay K2, and relay Kn, etc.

[0051] In this embodiment, by adding a temperature switch unit, when the screws on one or two terminals of the positive and negative terminals of the battery pack are not tightened, the terminals will heat up during the charging and discharging process of the battery pack. When the temperature reaches the protection temperature of the temperature switch unit, the temperature switch unit will disconnect, thereby causing the optocoupler to stop working and the battery pack to be disconnected from the aging cabinet, thus protecting the battery pack.

[0052] Example 3: This embodiment makes further structural optimizations based on Embodiment 1. Please refer to... Figure 1 and Figure 2 Based on the above, refer to Figure 3 .

[0053] On the other hand, the present invention provides an aging cabinet 20, including the battery module aging safety device 10 in the above embodiment 1 or embodiment 2.

[0054] The above description is merely an example and illustration of the structure of this invention, and while the description is specific and detailed, it should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these obvious substitutions all fall within the protection scope of this invention.

Claims

1. A battery module aging safety device, characterized in that, The device is used for connecting the battery pack to the aging cabinet and includes an optocoupler, a first resistor, a second resistor, and a switching unit. The positive input side of the optocoupler is connected to the positive terminal of the battery pack after being connected in series with the first resistor, the negative input side of the optocoupler is connected to the negative terminal of the battery pack, one end of the output side of the optocoupler is connected to the control terminal of the switching unit after being connected in series with the second resistor, and the other end of the output side of the optocoupler is grounded. The input terminal of the switching unit is used to connect to the positive and negative terminals of the battery pack, and the output terminal of the switching unit is connected to the aging cabinet. The input terminal of the switching unit is normally open. When the positive and negative terminals of the battery pack are correctly connected to the optocoupler, the optocoupler drives the input terminal of the switching unit to close.

2. The battery module aging safety device according to claim 1, characterized in that, The optocoupler is a phototransistor type optocoupler; One end of the output side of the optocoupler is a collector, and the collector is connected in series with the second resistor and then connected to the control terminal of the switching unit. The other end of the output side of the optocoupler is the emitter, and the emitter is grounded.

3. The battery module aging safety device according to claim 1, characterized in that, The switching unit is a relay, and the relay has contact one and contact two; One end of the output side of the optocoupler is connected in series with the second resistor and then connected to the coil input terminal of the relay, and the coil output terminal of the relay is grounded; Contact one is used to connect or disconnect the positive terminal of the battery pack and the aging cabinet, and contact two is used to connect or disconnect the negative terminal of the battery pack and the aging cabinet.

4. The battery module aging safety device according to claim 3, characterized in that, The relay coil output terminal is also connected in series with a display device, which is used to display the correct connection between the positive and negative terminals of the battery pack and the optocoupler.

5. The battery module aging safety device according to claim 4, characterized in that, The display device is an LED lamp.

6. The battery module aging safety device according to claim 3, characterized in that, A fuse is also connected in series between the contact point and the aging cabinet.

7. The battery module aging safety device according to claim 1, characterized in that, It also includes a temperature switch unit; The temperature switch unit is used to connect or disconnect the battery pack from the optocoupler.

8. The battery module aging safety device according to claim 7, characterized in that, The temperature switch unit includes temperature switch one and temperature switch two; The temperature switch is connected to the terminal of the positive terminal of the battery pack. The second temperature switch is connected to the terminal of the negative terminal line of the battery pack.

9. The battery module aging safety device according to any one of claims 1-8, characterized in that, There are multiple battery packs; The multiple battery packs are respectively connected to different optocouplers and different switching units.

10. An aging cabinet, characterized in that, Includes the battery module aging safety device according to any one of claims 1-9.

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