A short-circuit battery isolation device and method for retired power batteries

Abstract

This application discloses a short-board battery isolation device and method for retired power batteries. The device includes a battery module, which includes at least one short-board battery. The short-board battery is connected to an isolation gating configuration matrix after being bypassed. The isolation gating configuration matrix has fuses connected in series at both ends of the short-board battery and reserves positions for shorting contacts. Measurement interfaces are reserved at both ends of the short-board battery for connecting to a managed monitoring circuit. This application solves the technical problem in the prior art where the overall utilization rate of the disassembled battery pack is low, often resulting in a large number of batteries being discarded due to short-board batteries, and easily leading to insufficient cell quantity in the entire battery pack for matching.

Description

Technical Field

[0001] This application relates to the field of retired power battery reuse technology, and in particular to a short-circuit battery isolation device and method for retired power batteries. Background Technology

[0002] With the booming development of China's electric vehicle industry, the installed capacity of power batteries used in electric vehicles has also increased year by year. By the end of 2018, my country's electric vehicle ownership had reached 261 million vehicles. The power batteries that were put into the market early are about to enter their retirement period. It is estimated that by 2020, the cumulative scale of retired power batteries will exceed 20 GWh. Hidden beneath the surface of the booming development of electric vehicles is the issue of power battery recycling and reuse.

[0003] Electric vehicles place high demands on the performance of their power batteries. According to the "6.2.11 Cycle Life" standard of QC / T 743-2006 "Lithium-ion Batteries for Electric Vehicles," the battery should be discharged at a current of 1.5I3(A) at 20℃±2℃ until the discharge capacity reaches 80% of the rated capacity. When the capacity of the power battery in an electric vehicle decays to below 80% of its nominal capacity, its cycle life is considered to have ended, and it is no longer suitable for use. To ensure the power performance, driving range, and safety performance of the electric vehicle during operation, it must be replaced. The replaced battery is called a "retired power battery."

[0004] Retired power batteries typically removed from electric vehicles still have significant remaining capacity and utilization value. After screening and regrouping, these batteries can be used in low-speed electric vehicles, electric bicycles, DC power supplies, microgrids, and other applications. They can also be used in energy storage applications with relatively good operating environments, mild charging and discharging conditions, and relatively low requirements for battery performance, thus realizing the tiered utilization of retired power batteries and alleviating the pressure of recycling and disposal.

[0005] However, retired power batteries are diverse in type, have varying performance, and exhibit significant variability. Furthermore, there are often weaker batteries within a battery pack, leading to numerous problems in the reuse of retired power batteries, such as low availability, difficulty in pairing them with other batteries, and inflexible connection methods.

[0006] The weakest link battery in a retired power battery pack will significantly degrade in performance, affecting the overall performance and causing the entire battery pack to be taken out of service prematurely, potentially posing safety hazards.

[0007] Typically, disassembling the entire battery pack and removing the faulty cells is necessary. This process is complex, and it can damage other batteries, creating potential problems. For retired power batteries with fewer faulty cells, one approach is to disassemble the entire battery pack into modules, then sort and group them. Modules containing faulty cells are discarded. Since battery modules are usually secured with screws, disassembly is relatively simple and labor-intensive. However, the overall utilization rate of the disassembled battery pack is low, often resulting in a large number of discarded cells due to faulty cells, leading to insufficient cells for grouping. Summary of the Invention

[0008] This application provides a short-board battery isolation device and method for retired power batteries, which solves the technical problem that in the prior art, the connection between battery modules is usually fixed by screws or other means, which is relatively simple to disassemble and has a low workload, but the overall utilization rate of the battery pack after disassembly is low. Often, a large number of batteries are discarded due to short-board batteries, and the number of cells in the entire battery pack is insufficient to match the batteries.

[0009] The first aspect of this application provides a short-circuit battery isolation device for retired power batteries, comprising:

[0010] A battery module, the battery module including at least one short-board battery, the short-board battery being connected to an isolation gating configuration matrix after being bypassed;

[0011] The isolation gating configuration matrix has fuses connected in series at both ends of the short-board battery, and reserves shorting positions for installing shorting pieces;

[0012] Both ends of the short-plate battery have reserved measurement interfaces for connection to the managed monitoring circuit.

[0013] Optionally, the managed monitoring circuit includes multiple gating circuits, each of which is used to connect to an isolated short-board battery.

[0014] Optionally, the managed monitoring circuit further includes a differential amplifier circuit for connecting multiple gating circuits.

[0015] Optionally, the data acquisition harness of the battery module is connected to a universal motherboard.

[0016] Optionally, the managed monitoring circuit is mounted on a daughterboard, which is plugged into a universal motherboard on which the acquisition harness of the battery module is installed.

[0017] The second aspect of this application provides a method for isolating the short-circuit battery of a retired power battery, which is implemented by the short-circuit battery isolation device for a retired power battery described in the first aspect, and includes the following steps:

[0018] Obtain the distribution data of the shortest battery in the entire battery pack;

[0019] Based on the distribution data, the locations of all short-board batteries and their adjacent cells are determined. For each short-board battery, the access location of the acquisition harness for the short-board battery is determined based on the location of the short-board battery and its corresponding adjacent cells.

[0020] Based on the location of the corresponding adjacent battery cell and the access location of the acquisition harness, the cutting and disassembly location of the short-board battery is determined, and the short-board battery is isolated by bridging bypass.

[0021] Obtain the distribution data of the isolated short-circuit batteries in the entire battery group, and connect the acquisition harness of the isolated short-circuit batteries to the isolation gating configuration matrix;

[0022] In the isolation gating isolation matrix, a managed monitoring circuit is connected to the entrance of each cell.

[0023] The isolated short-circuit battery is monitored through the managed monitoring circuit.

[0024] Optionally, obtaining the distribution data of the shortest-pole batteries in the entire battery pack specifically includes:

[0025] The distribution of short-board batteries in the entire battery pack is statistically analyzed, and the location of the short-board batteries and the material, width, and thickness of the conductive connectors corresponding to the short-board batteries are determined based on the distribution.

[0026] Optionally, the access location includes any point between the positive terminal of the short-plate battery and the negative terminal of the adjacent cell corresponding to the short-plate battery.

[0027] Optionally, the cutting and dismantling position is included on the conductive connector of the short-plate battery, and the cutting and dismantling position of the short-plate battery is determined according to the position of the corresponding adjacent cell and the access position.

[0028] Optionally, the provision in the isolation gating isolation matrix that connects a managed monitoring circuit at the entrance of each cell includes:

[0029] In the isolation gate isolation matrix, a managed measurement interface is reserved at the entrance position of each cell, and a managed monitoring circuit is connected through the managed measurement interface.

[0030] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0031] This application provides a short-circuit battery isolation device for retired power batteries, comprising:

[0032] A battery module, the battery module including at least one short-board battery, the short-board battery being connected to an isolation gating configuration matrix after being bypassed;

[0033] The isolation gating configuration matrix has fuses connected in series at both ends of the short-board battery, and reserves shorting positions for installing shorting pieces;

[0034] Both ends of the short-plate battery have reserved measurement interfaces for connection to the managed monitoring circuit.

[0035] This application provides a short-circuit battery isolation device for retired power batteries. By statically bridging the short-circuit batteries within the retired power battery, it eliminates the need to disassemble the entire battery pack or individual cells, avoiding damage to the battery pack structure and other cells. It preserves the individual cells of the short-circuit batteries within the original system, meeting the consistency requirements of the entire battery pack while achieving lower modification time and cost, demonstrating good economic efficiency and adaptability. Furthermore, for isolated short-circuit batteries, there is no need to rearrange the acquisition harness; the existing harness can be used, adjusted and configured in conjunction with the isolation gating configuration matrix. This allows for flexible compatibility with isolation results for different short-circuit batteries. An independent channel is used to manage and monitor the isolated short-circuit batteries, ensuring they are in a knowable and controllable state, thus guaranteeing the safe and stable operation of the reassembled retired power battery. The retired power battery processing device of this application solves the technical problem that in the prior art, the connection between battery modules is usually fixed by screws or other means, which makes disassembly relatively simple and labor-saving, but the overall utilization rate of the disassembled battery pack is low. Often, a large number of batteries are discarded due to short circuits, and the number of cells in the entire battery pack is insufficient to match the batteries. Attached Figure Description

[0036] Figure 1 A schematic flowchart illustrating an embodiment of a short-circuit battery isolation method for a retired power battery provided in this application;

[0037] Figure 2 A schematic flowchart illustrating another embodiment of a short-circuit battery isolation method for a retired power battery provided in this application;

[0038] Figure 3 A schematic diagram of the isolation bypass of an embodiment of a short-circuit battery isolation device for a retired power battery provided in this application;

[0039] Figure 4A schematic diagram of managed monitoring for one embodiment of a short-circuit battery isolation device for a retired power battery provided in this application;

[0040] Figure 5 A circuit diagram of the isolation configuration matrix of an embodiment of a short-circuit battery isolation device for a retired power battery provided in this application;

[0041] Figure 6 This is a schematic diagram of a traditional battery management system (BMS).

[0042] Figure 7 A schematic diagram of the structure of a short-circuit battery isolation device for a retired power battery provided in this application;

[0043] Figure 8 This is a diagram showing the monitoring signal flow of a traditional battery management system (BMS).

[0044] Figure 9 This application provides a monitoring signal flow diagram for a short-circuit battery isolation device for a retired power battery.

[0045] Figure 10 This is a schematic diagram of voltage acquisition in a traditional battery management system (BMS).

[0046] Figure 11 A schematic diagram of voltage acquisition for a short-circuit battery isolation device for a retired power battery provided in this application. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0048] Short-terminal battery: A power battery system is composed of several individual battery cells connected in series or parallel through conductive connectors (bus-bars). The individual battery cells can be grouped into a whole battery pack or several battery modules. The cells in the same group exhibit a high degree of consistency in electrical parameters, performance, and state.

[0049] Due to subtle differences in manufacturing processes or materials, variations in operating temperature caused by different cell locations, and differences in the accuracy and error of battery management system (BMS) data acquisition and balancing, individual cells within the same group can exhibit significant differences from other cells in terms of voltage, capacity, and health. The degradation of individual cells initially manifests as inconsistencies with other cells, gradually spreading and affecting the performance and condition of the entire group, exhibiting a "weakest link" effect. These cells with poor consistency are referred to as "short-chain batteries," and retired power batteries typically contain a certain number of short-chain batteries. When retired power batteries are used in a tiered system, the number and physical isolation locations of short-chain batteries are determined based on the required consistency of individual cells within the battery module. Furthermore, the conductive connections of these short-chain batteries are separated, isolated, and bypassed. Assuming that BAT2 is the short-circuit battery in the battery module, by bypassing the short-circuit battery, there is no need to remove the short-circuit battery from the entire battery module. This reduces the disassembly process, improves work efficiency, reduces reuse costs, facilitates later maintenance and operation, and is more conducive to large-scale application.

[0050] Even after bypassing and bridging the short-circuit cells within a battery module, although these cells are electrically isolated and completely disconnected from other cells, they can still exist as independent entities within the module in a static state for extended periods. Their voltage and temperature characteristics remain unknown due to environmental influences. Without appropriate oversight, the entire battery module still poses potential safety hazards. Therefore, real-time online monitoring and management of the cells' relevant characteristics are necessary.

[0051] The circuit diagram for online monitoring and management of short-circuit batteries that have already undergone bypass bridging is as follows: Figure 6 The diagram shown illustrates the structure of a traditional battery management system (BMS). Figure 7 The schematic diagram of this application shows that, for isolated short-circuit batteries, in order to ensure the safe and stable operation of the battery module and the entire system, the short-circuit batteries need to be independently monitored and managed online to ensure their stable performance and safe operation, and to promptly detect and prevent further deterioration of the short-circuit batteries.

[0052] In traditional or third-party battery management systems (BMS), the data acquisition harness is connected to both ends of each individual battery cell, such as... Figure 8 The monitoring signal flow diagram shown indicates that the signal is connected to the acquisition terminal of the battery management system (BMS) via the acquisition harness, undergoes multi-channel control through the analog front-end AFE, and then enters the ADC for measurement. The signal is then acquired, analyzed, and processed by the MCU.

[0053] The isolated managed monitoring system improves upon traditional battery management systems in two aspects:

[0054] Firstly, because the short-board battery was bridged in the main circuit connection of the battery module, the original acquisition harness could no longer be used normally. Reprocessing and installing the harness would be time-consuming, labor-intensive, and costly. Therefore, this application proposes an improvement to add an "isolation gating configuration matrix" before the analog front-end AFE of the traditional battery management BMS, which can realize the reuse of the original acquisition harness without reprocessing and installation.

[0055] Secondly, when a short-circuit battery is connected, it is isolated and separated within the battery module, resulting in a situation where no one monitors or manages it, and there are certain potential fault hazards. Therefore, this application proposes an improvement by adding an independent "managed monitoring circuit" to the traditional battery management system (BMS) to monitor and control the connected short-circuit batteries in real time, achieving comprehensive management that is known and controllable. At the same time, the original data transmission channel can be reused, eliminating the need for additional wiring and communication connections.

[0056] Online monitoring and management of short-pole batteries requires real-time monitoring of key characteristic parameters such as cell voltage and temperature. To prevent over-discharge leading to excessively low voltage and accelerated degradation, a dedicated charging circuit is also needed. Figure 9 .

[0057] Isolated hosting: The power battery system is composed of several individual cells connected in series or in parallel through conductive connectors (bus-bar). This accelerates the deterioration and retirement of the entire battery pack, and also affects the reuse of retired power batteries, thus restricting the development of subsequent tiered utilization.

[0058] Conductive connectors (bus-bars) are typically fixed at the designed positions of the cell terminals, serving functions such as connection, fixation, and safety protection. Disassembly is difficult and labor-intensive. Based on the distribution of short-circuit batteries in the entire battery pack, a "point-to-point elimination" method is adopted. Without disassembling the entire battery pack, only existing short-circuit batteries are cut and disassembled. Then, conductive connectors such as copper busbars and cables are used for bridging and bypassing, achieving isolation and bypassing of the short-circuit batteries. For isolated short-circuit batteries, they are retained in the entire battery pack without removal. The original wiring harness of the entire battery pack is preserved, and independent channels are used to collect electrical parameters such as voltage, current, and temperature. This enables the management and monitoring of isolated short-circuit batteries, ensuring they are in a knowable and controllable state, and guaranteeing the safe and stable operation of the reassembled retired power batteries. Isolation and management only applies to short-circuit batteries within the entire battery pack, employing different battery management hardware and strategies from other cells in the pack.

[0059] For isolated short-circuit batteries, they are retained in the overall battery pack without being removed. The original wiring harness of the entire battery pack is retained, and an independent channel is used to collect electrical parameters such as voltage and temperature of the isolated short-circuit batteries. This is used to manage and monitor the isolated short-circuit batteries, ensuring that they are in a knowable and controllable state, and thus ensuring the safe and stable operation of the retired power batteries after reorganization.

[0060] In traditional battery management systems (BMS), the cells are connected in series, with fuses (F) connected in series at both ends. The data then enters a dedicated analog wire collector (AFE) chip for voltage sampling, typically using 8, 12, or 16-channel cell data acquisition. (See attached image.) Figure 10 The diagram shows a typical voltage acquisition process for a battery management system (BMS).

[0061] For battery modules with short-circuit batteries, after the short-circuit batteries are bypassed and isolated, if a traditional battery management system (BMS) and the original wiring harness are used, the positive and negative terminals of the short-circuit batteries will still be connected to a channel of the acquisition chip, causing the acquisition chip to malfunction and preventing voltage acquisition of normal cells. Furthermore, for isolated short-circuit batteries, new acquisition wiring harnesses are required if status monitoring is needed. Therefore, to avoid these problems, this application, based on the handling of short-circuit batteries within the battery module, not only bypasses and bridges the short-circuit batteries within the battery module, but also optimizes the hardware circuitry of the battery management system. Through an isolation gating matrix, without changing the original wiring harness, and through initial configuration, it can flexibly achieve compatibility with different numbers and specifications of battery modules, resulting in high efficiency and economy in battery module modification.

[0062] This application provides a short-board battery isolation device and method for retired power batteries, which solves the technical problem that in the prior art, the connection between battery modules is usually fixed by screws or other means, which is relatively simple to disassemble and has a low workload. However, the overall utilization rate of the disassembled battery pack is low, and a large number of batteries are often discarded due to short-board batteries. This can easily lead to insufficient number of cells in the entire battery pack, making it impossible to match them.

[0063] For easier understanding, please refer to the appendix. Figure 3-5 , Figure 3 A schematic diagram of the isolation bypass of an embodiment of a short-circuit battery isolation device for a retired power battery provided in this application; Figure 4 A schematic diagram of managed monitoring for one embodiment of a short-circuit battery isolation device for a retired power battery provided in this application; Figure 5 A circuit diagram of the isolation gating matrix of an embodiment of a short-circuit battery isolation device for a retired power battery provided in this application;

[0064] The first aspect of this application provides a short-circuit battery isolation device for retired power batteries, comprising:

[0065] The battery module includes at least one short-board battery, which is connected to the isolation gating configuration matrix after being bypassed and connected to the short-board battery.

[0066] The isolation gating configuration matrix has fuses connected in series at both ends of the short-board battery, and reserves shorting positions for installing shorting pieces;

[0067] Both ends of the short-board battery have reserved measurement interfaces for connection to the managed monitoring circuit.

[0068] It should be noted that, as shown in the attached document... Figure 4 The circuit diagram shown has pre-drilled shorting points at both ends of each battery cell, forming an isolation and gating configuration matrix. Under normal operating conditions, a dedicated AFE chip can sequentially collect the voltages of all batteries in the module. For example, the voltage of battery #1 is Uab, the voltage of battery #2 is Ubc, and so on. When battery #2 needs to be managed, fuse F1 can be removed and shorting point F2A installed. At this time, Uac = Uab (the voltage of battery #1), and Ubc = 0, indicating that the dedicated AFE chip can collect data normally.

[0069] Through a dedicated measurement interface, the acquisition signal of the short-board battery is separated by the isolation gating configuration matrix. The acquisition signal is then connected to the managed monitoring circuit, which can monitor the voltage and other parameters of the short-board battery in real time.

[0070] Furthermore, the managed monitoring circuit includes multiple gating circuits, each of which is used to connect to the isolated short-board battery.

[0071] Furthermore, the managed monitoring circuit also includes a differential amplifier circuit for connecting multiple gating circuits.

[0072] It should be noted that because the voltage of the entire battery cluster is high and the location of the short-cell batteries within the cluster is unknown, directly connecting the positive and negative terminals of the short-cell batteries to the ADC (Analog Converter) could damage the ADC due to the extremely high common-mode voltage generated by the short-cell batteries, potentially leading to a safety hazard. Figure 11 As shown, the gating circuit of the short-board battery can effectively isolate the influence of high common-mode voltage, so that the signal entering the subsequent acquisition circuit is within the acceptable range of the ADC.

[0073] Furthermore, the battery module's data acquisition harness is connected to a universal motherboard.

[0074] It should be noted that the battery module's data acquisition harness can be connected to a universal motherboard, with the isolation and management circuitry serving as a daughterboard, connected in series before the analog front-end AFE. Data transmission is achieved via a CAN or RS485 communication bus, sharing the motherboard's communication link. By configuring the battery module, data exchange and status monitoring can be realized.

[0075] Furthermore, the managed monitoring circuit is located on the daughterboard, which is plugged into a universal motherboard that houses the acquisition harness of the battery module.

[0076] It should be noted that the entire circuit of the managed monitoring circuit can be embedded in the traditional battery management system (BMS) as a separate board, in a motherboard-daughter board configuration. Since the modification is carried out within the battery management unit, it does not occupy external space or additional wiring, thus making implementation simple and economical.

[0077] In addition, this managed monitoring circuit can also be used as a separate external unit (external isolated managed acquisition device) to work in series with a third-party battery management system. It is compatible with the existing BMS and battery module connection harnesses, requiring only the addition of an isolated managed acquisition board and BMS connection harness, thus providing good flexibility and applicability.

[0078] For ease of understanding, see Figure 1 , Figure 3-5 , Figure 1 A schematic flowchart illustrating an embodiment of a short-circuit battery isolation method for a retired power battery provided in this application; Figure 3 A schematic diagram of the isolation bypass of an embodiment of a short-circuit battery isolation method for a retired power battery provided in this application; Figure 4 A schematic diagram of managed monitoring for one embodiment of a short-circuit battery isolation method for a retired power battery provided in this application; Figure 5 A circuit diagram of the isolation gating configuration matrix for one embodiment of a short-circuit battery isolation method for a retired power battery provided in this application;

[0079] The second aspect of this application provides a method for isolating the short-circuit battery of a retired power battery, which is implemented by the short-circuit battery isolation device for a retired power battery provided in the first aspect, and includes the following steps:

[0080] 100, obtain the distribution data of the shortest battery in the entire battery pack;

[0081] 200. Based on the distribution data, determine the location of all short-board batteries and the location of the adjacent cells of the short-board batteries. For each short-board battery, determine the access location of the acquisition harness of the short-board battery based on the location of the short-board battery and the location of the adjacent cells of the short-board battery.

[0082] 300. Based on the location of the adjacent battery cell and the access location of the acquisition harness, determine the cutting and disassembly location of the short battery and perform cross-connection bypass isolation on the short battery.

[0083] 400, obtain the distribution data of isolated short-board batteries in the entire battery group, and connect the acquisition harness of isolated short-board batteries to the isolation gating configuration matrix;

[0084] 500, in the isolation gating isolation matrix, a managed monitoring circuit is connected to the entrance of each cell;

[0085] 600, through managed monitoring circuitry, monitors isolated short-circuit batteries.

[0086] It should be noted that the short-circuit battery isolation method for retired power batteries provided in this application embodiment is divided into two stages for handling short-circuit batteries within the retired power battery: firstly, the short-circuit batteries in the entire battery pack are isolated and bypassed: firstly, the distribution data of the short-circuit batteries in the entire battery pack are statistically analyzed, in order to... Figure 3 Taking the circuit diagram of the isolation bypass shown as an example, with cell #2 in the diagram as the short-circuit battery, point A is the negative terminal of cell #1, point B is the positive terminal of cell #2, and point A' is the access position of the acquisition harness for the negative terminal of cell #1 (or the positive terminal of cell #2). Within the interval between A and A' of cells #1 and #2, a suitable processing position is selected for cutting and disassembling the conductive connectors. Then, based on the distribution data and the access position of the acquisition harness, the current carrying capacity and layout of the jumper cable or jumper copper busbar are determined, and points A and C are jumpered together to achieve the connection of the short-circuit battery (i.e., Figure 3 The bypass isolation of cell #2 in the battery pack. All isolated short-circuit batteries can remain in the battery pack without being disassembled and removed. The electrical connections of the main circuits of other cells can also be retained accordingly, and the data acquisition harnesses of each cell remain unchanged.

[0087] The steps for managed monitoring of all isolated short-circuit batteries are as follows: First, collect the distribution data of all isolated short-circuit batteries in the entire battery group. Figure 4Taking the circuit diagram of the isolation gating configuration matrix shown as an example, with cell #2 as the short-circuit battery, after various bypass processing, the isolation gating configuration matrix is ​​used to remove fuse F1 at position F1 and install fuse F1' at position F1' to short-circuit the original acquisition point of cell #2. At this time, Uab = Uac, which is the actual voltage of cell #1, while Ubc = 0, indicating that cell #2 has not been acquired and the dedicated front-end chip AFE has not floated. Ucd = Ubd, which is the actual voltage of cell #3. All battery data can be acquired normally. Within each isolation gating configuration matrix, each cell is connected to a managed monitoring circuit. The managed monitoring circuit can be... Figure 11 The circuit diagram shown consists of a gating circuit, a differential amplifier circuit, an ADC acquisition circuit, a microprocessor, and a communication interface. These circuits are all controlled by the microprocessor, which controls the gating circuit based on the number and wiring of the isolated short-circuit batteries, ensuring that only one isolated short-circuit battery is connected to the differential amplifier circuit. The collected test signals are analyzed for performance and status by the ADC and microprocessor, and then uploaded to the backend via the communication interface. The collected signals can be used for online monitoring and status assessment of the short-circuit batteries.

[0088] See Figure 2 This is a flowchart illustrating another embodiment of a short-circuit battery isolation method for a retired power battery provided in this application;

[0089] Furthermore, obtaining the distribution data of the weakest cells in the entire battery pack specifically includes:

[0090] 110. Statistically analyze the distribution of short-board batteries in the entire battery pack, and determine the location of the short-board batteries and the material, width, and thickness of the corresponding conductive connectors based on the distribution.

[0091] It should be noted that obtaining the distribution data of the short-board batteries in the entire battery pack includes statistically analyzing the distribution of the identified short-board batteries in the entire battery pack, and further determining the distribution location of these short-board batteries to be processed, as well as the material, width, and thickness of their corresponding conductive connectors.

[0092] Furthermore, the access location includes any point between the positive terminal of the short-plate battery and the negative terminal of the adjacent cell corresponding to the short-plate battery.

[0093] It should be noted that, with Figure 3 Taking the circuit diagram as an example, cell #2 is a short-plate battery, point A is the negative terminal of cell #1, point B is the positive terminal of cell #2, and point A' is the connection point of the acquisition harness for either the negative terminal of cell #1 or the positive terminal of cell #2.

[0094] Furthermore, the cutting and dismantling location includes the conductive connector of the short-cell battery. The cutting and dismantling location of the short-cell battery is determined based on the location of the adjacent cells and the access location of the data acquisition harness.

[0095] It should be noted that, with Figure 3 Taking the circuit diagram as an example, cell #2 is a short-plate battery. Within the range of A and A' in the conductive connector between cell #1 and cell #2, select a suitable processing position to cut and disassemble this section of the conductive connector.

[0096] For easier understanding, please refer to Figure 2 This is a flowchart illustrating another embodiment of a short-circuit battery isolation method for a retired power battery provided in this application;

[0097] Furthermore, in the isolation gating isolation matrix, the managed monitoring circuit connected to the entrance of each cell includes:

[0098] 510. In the isolation gating isolation matrix, a managed measurement interface is reserved at the entrance position of each cell, and the managed monitoring circuit is connected through the managed measurement interface.

[0099] It should be noted that each cell in the isolation gating configuration matrix has a corresponding managed measurement interface reserved at its entry point, and managed monitoring circuits are connected through these managed measurement interfaces.

[0100] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A method for isolating the short-circuit battery of a retired power battery, characterized in that, This method is implemented in a short-board battery isolation device for retired power batteries. The device includes: a battery module comprising at least one short-board battery; the conductive connectors of the short-board battery are separated and isolated; and the isolated short-board battery is connected to an isolation gate configuration matrix after being bypassed. The isolation gate configuration matrix includes at least one reserved connection position for installing a shorting tab; both ends of the reserved connection position are connected in series with fuses, and the fuses are respectively connected to both ends of the short-board battery; both ends of the short-board battery have reserved measurement interfaces for connecting to a managed monitoring circuit; when the short-board battery needs to be managed, the shorting tab replaces the fuses and is connected to both ends of the reserved position. The managed monitoring circuit includes multiple gating circuits, each gating circuit being used to connect to the isolated short-board battery; the managed monitoring circuit also includes a differential amplifier circuit for connecting the multiple gating circuits. The method includes the following steps: Obtain the distribution data of the shortest battery in the entire battery pack; The location of all the short-board batteries and the location of the adjacent cells of the short-board batteries are determined based on the distribution data. For each short-board battery, the access location of the acquisition harness of the short-board battery is determined based on the location of the short-board battery and the location of the adjacent cells of the short-board battery. Based on the location of the corresponding adjacent battery cell and the access location of the acquisition harness, the cutting and disassembly location of the short-board battery is determined, and the short-board battery is isolated by bridging bypass. Obtain the distribution data of the isolated short-circuit batteries in the entire battery group, and connect the acquisition harness of the isolated short-circuit batteries to the isolation gating configuration matrix; In the isolation gating isolation matrix, a managed monitoring circuit is connected to the entrance of each cell. The isolated short-circuit battery is monitored through the managed monitoring circuit.

2. The method for isolating the short-circuit battery of a retired power battery according to claim 1, characterized in that, The battery module's data acquisition harness is connected to a universal motherboard.

3. The short-circuit battery isolation method for retired power batteries according to claim 1, characterized in that, The managed monitoring circuit is mounted on a daughterboard, which is plugged into a universal motherboard on which the acquisition harness of the battery module is installed.

4. The method for isolating the short-circuit battery of a retired power battery according to claim 1, characterized in that, The specific steps of obtaining the distribution data of the shortest battery in the entire battery pack include: The distribution of short-board batteries in the entire battery pack is statistically analyzed, and the location of the short-board batteries and the material, width, and thickness of the conductive connectors corresponding to the short-board batteries are determined based on the distribution.

5. The method for isolating the short-circuit battery of a retired power battery according to claim 1, characterized in that, The access location includes any point between the positive terminal of the short-plate battery and the negative terminal of the adjacent cell corresponding to the short-plate battery.

6. The method for isolating the short-circuit battery of a retired power battery according to claim 1, characterized in that, The cutting and dismantling location is located on the conductive connector of the short-plate battery. The cutting and dismantling location of the short-plate battery is determined according to the location of the corresponding adjacent cell and the access location of the acquisition harness.

7. The method for isolating the short-circuit battery of a retired power battery according to claim 1, characterized in that, The isolation selection isolation matrix, wherein the managed monitoring circuit connected at the entrance of each cell includes: In the isolation gate isolation matrix, a managed measurement interface is reserved at the entrance position of each cell, and a managed monitoring circuit is connected through the managed measurement interface.

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