Power battery pack recycling and discharging device and control method

Abstract

The invention provides a power battery pack recycling and discharging device and a control method, the power battery pack recycling and discharging device comprises a detection unit, a control unit and a discharging unit, the detection unit is connected with an information acquisition board of a power battery pack through a communication protocol, and is used for acquiring data information of the power battery pack; the control unit is used for generating a discharging instruction based on the data information of the power battery pack and sending the discharging instruction to the discharging unit; and the discharging unit is electrically connected with the power battery pack and is used for discharging the power battery pack according to the received discharging instruction. The detection unit is connected with the information acquisition board of the power battery pack through the communication protocol to obtain the data information of the power battery pack, so that the discharge instruction of the power battery pack is conveniently determined, the discharge operation is shortened, and meanwhile, the risk caused by over-discharge of the battery is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery pack recycling, and particularly to a power battery pack recycling discharge device and a control method. Background Art

[0002] With the rapid development of new energy vehicles, more and more vehicle manufacturers are involved in the development of new energy vehicles. When new energy vehicles are updated or reach the end of their service life, the new energy vehicles are retired, and their power battery packs should be recycled and then used for stepped utilization or scrapped and disassembled. However, due to the different BMS communication protocols of power battery packs of different brands, most battery recycling plants do not have the BMS communication protocols of all power battery packs. Therefore, when recycling and discharging the power battery pack, it is impossible to read the voltage, current, and temperature information of each single battery. Before discharging, it is necessary to first count the number of single batteries, and then set the final discharge cut-off total voltage of the power battery pack, which is time-consuming. At the same time, most of the recycled power battery packs have a certain service life, and there may be a phenomenon that a single battery is damaged or the capacitance and resistance are inconsistent inside. During discharging, due to the inability to detect the voltage and temperature information of the single battery, there is an over-discharge phenomenon, which damages the battery pack. Summary of the Invention

[0003] The present invention provides a power battery pack recycling discharge device and a control method, which can overcome the problem that the BMS communication protocol of used power battery packs cannot be correctly read in the prior art, resulting in time-consuming recycling and discharging operations.

[0004] To solve the above problems, the present invention provides a power battery pack recycling discharge device, including a detection unit, a control unit, and a discharge unit.

[0005] The detection unit includes a data acquisition module, the data acquisition module includes a communication protocol, and the detection unit is connected to the information acquisition board of the power battery pack through the communication protocol, and is used to collect the data information of the power battery pack from the information acquisition board of the power battery pack.

[0006] The control unit is used to generate a discharge instruction based on the data information of the power battery pack, and send the discharge instruction to the discharge unit.

[0007] The discharge unit is electrically connected to the power battery pack, and is used to discharge the power battery pack according to the received discharge instruction.

[0008] In an optional solution of the present application, the discharge unit consumes the remaining electric energy by doing work and generating heat through a power resistor.

[0009] In an optional solution of the present application, the connection method between the detection unit and the voltage and temperature acquisition board of the power battery pack includes jumper connection.

[0010] In an alternative embodiment of the present application, the power battery pack includes a power port and a signal port, and the detection unit is connected to the signal port; the power port is connected to the positive and negative electrodes of the battery unit in the power battery pack, and the discharge unit is connected to the positive and negative electrodes.

[0011] In an alternative embodiment of the present application, the data information of the power battery pack includes one or more of the voltage, temperature, current, and power of the power battery pack.

[0012] In an alternative embodiment of the present application, the detection unit transmits the data information of the power battery pack to the control unit by means of TPC or API.

[0013] In an alternative embodiment of the present application, the control unit includes a computer, and the computer performs comparison and analysis based on the data information of the power battery pack collected by the detection unit and the brand model information of the power battery pack to determine the discharge time for the discharge unit to receive the power battery pack.

[0014] On the other hand, the present invention provides a control method for a power battery pack recycling and discharging device as described above, including:

[0015] Collecting the brand model information of the power battery pack;

[0016] The detection unit collects one or more of the voltage, temperature, current, and power information of the power battery pack;

[0017] The control unit collects the detection information of the detection unit and the brand model information of the power battery pack, performs comparison and analysis, and determines the discharge strategy of the power battery pack;

[0018] The discharge unit discharges the power battery pack according to the discharge strategy.

[0019] In an alternative embodiment of the present application, the discharge mode of the power battery pack includes at least one of constant current discharge, constant voltage discharge, and constant current and constant voltage discharge.

[0020] In an alternative embodiment of the present application, the control method further includes detecting the wiring status of the power battery pack with the detection unit and the discharge unit, and the discharge operation can only be performed when all the wirings of the power battery pack are correct.

[0021] The present invention has the following beneficial effects:

[0022] The detection unit is connected to the information acquisition board of the power battery pack through a communication protocol to obtain the data information of the power battery pack, thereby facilitating the determination of the discharge instruction of the power battery pack, shortening the discharge operation, and avoiding the risk of over-discharge of the battery at the same time. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the power battery pack recovery and discharge device of the present invention;

[0025] Figure 2 It is a schematic structural diagram of the power battery pack of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the signal port of the power battery pack of the present invention;

[0027] Figure 4 It is a schematic connection diagram of the detection unit and the signal port of the power battery pack of the present invention;

[0028] Figure 5 It is a schematic structural diagram of the discharge unit of the present invention;

[0029] Figure 6 It is a flowchart of the discharge operation of the power battery pack recovery and discharge device of the present invention;

[0030] Figure 7 It is a safety logic diagram of the power battery pack recovery and discharge device of the present invention.

[0031] The reference numerals are as follows:

[0032] 1. Power battery pack; 11. Battery unit; 12. BMS communication protocol module; 13. Positive electrode of the battery; 14. Negative electrode of the battery; 15. Power supply port; 151. High-voltage box; 16. Signal port; 161. Jack;

[0033] 2. Detection unit; 21. Acquisition line;

[0034] 3. Control unit;

[0035] 4. Discharge unit; 41. Power line. Specific Embodiments

[0036] In the description of the present invention, it should be understood that when descriptions indicating orientation or positional relationships such as "center", "inner", "outer", "axial direction", "radial direction", "circumferential direction", etc. appear, without special instructions, they are understood to be based on the orientation or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] In addition, features limited by "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Features limited by "first" and "second" may explicitly or implicitly include at least one of the limited features. When descriptions such as "a plurality of" appear, the general meaning is at least including two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0038] In the present invention, unless otherwise clearly specified and limited, when terms such as "installation", "connection", "connection", "fixation", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of this specification, when terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] The present invention provides a power battery pack recycling and discharging device, including a detection unit 2, a control unit, and a discharging unit.

[0041] The detection unit 2 includes a data acquisition module, the data acquisition module includes a communication protocol, and the detection unit 2 is connected to the information acquisition board of the power battery pack 1 through the communication protocol, and is used to collect the data information of the power battery pack 1 from the information acquisition board of the power battery pack.

[0042] The control unit 3 is configured to generate a discharge instruction based on the data information of the power battery pack 1 and send the discharge instruction to the discharge unit 4;

[0043] The discharge unit 4 is electrically connected to the power battery pack 1 and discharges the power battery pack 1 according to the received discharge instruction.

[0044] The detection unit collects the data information of the power battery pack and provides it to the control unit; the control unit generates a discharge instruction based on the data information of the power battery pack and sends it to the discharge unit, and the discharge unit discharges the power battery pack according to the discharge instruction.

[0045] Figures 1 to 5 There is provided a power battery pack 1 recovery and discharge device according to a specific embodiment of the present invention.

[0046] Figure 1 Fig. shows a schematic structural diagram of the power battery pack 1 recovery and discharge device of the present invention; the power battery pack 1 recovery and discharge device includes a power battery pack 1, a detection unit 2, a control unit 3, and a discharge unit 4 connected in a loop. More specifically, the signal port 16 of the power battery pack 1 is connected to the detection unit 2, the detection unit 2 is then connected to the control unit 3, the control unit 3 is then connected to the discharge unit 4, and the discharge unit 4 is connected to the power port 15 of the power battery pack 1.

[0047] In the present invention, the detection unit 2 is connected to the power battery pack 1 through the can bus to obtain the data information of the power battery pack 1, so as to facilitate the determination of the discharge condition of the power battery pack 1, shorten the discharge operation, and at the same time avoid the risk of over-discharge of the battery.

[0048] The detection unit 2 is used to detect the real-time data information of the power battery pack 1 and provide it to the control unit 3. The control unit 3 analyzes the collected data information and gives a discharge instruction. The discharge unit 4 executes the discharge instruction and receives the power release of the power battery pack 1; based on the fact that the main information related to the power battery pack 1 can be collected by the detection unit 2, and this main information generally includes power, voltage, etc., the control unit 3 can judge and determine the discharge time and the discharged power. Therefore, the degree of power transfer between the discharge unit 4 and the power battery pack 1 is controllable, and over-discharge of the power battery pack 1 can be avoided, and the power battery pack 1 will not be damaged.

[0049] The present invention realizes accurate discharge of the power battery pack 1 without using the BMS communication protocol, so it is applicable to the discharge operation of power battery packs 1 with different BMS communication protocols, and has good stability and high safety.

[0050] The first acquisition board of the above detection unit 2 pre-stores the communication protocols of all types of automobiles on the market, which facilitates accurate corresponding connection with the collected power battery packs. For example, according to the brand of the power battery pack, it is determined that the first acquisition board uses the corresponding communication protocol to connect with the second acquisition board.

[0051] The above discharge unit is a conventional power resistor device, which consumes the remaining electric energy of the power battery pack by working and generating heat through the power resistor device.

[0052] In some embodiments,

[0053] The connection mode between the detection unit 2 and the voltage and temperature acquisition board of the power battery pack 1 includes jumper connection.

[0054] The connection between the detection unit 2 and the voltage and temperature acquisition board of the power battery pack 1 is completed by means of jumper connection. Based on the inability to understand the BMS communication protocol of the power battery pack 1, it is difficult to accurately connect to the correct protocol jack 161 to obtain the information of the power battery pack 1; by using jumper connection, the acquisition lines 21 of the detection unit 2 are respectively connected to different jacks 161 to obtain the correct position to obtain the information of the power battery pack 1.

[0055] Figure 2 Fig. shows a schematic structural diagram of a power battery pack 1 according to an embodiment of the present invention; Figure 3 Fig. shows a schematic structural diagram of the signal port 16 of the power battery pack 1 according to an embodiment of the present invention; as Figures 2 to 3 shown, the power battery pack 1 mainly includes a battery unit 11, a BMS communication protocol, a battery positive electrode 13, a battery negative electrode 14, a power supply port 15, a high-voltage box 151, a signal port 16, and a jack 161.

[0056] Figure 4 Fig. shows a schematic connection diagram between the detection unit 2 and the signal port 16 of the power battery pack 1 according to an embodiment of the present invention, wherein the detection unit 2 and the signal port 16 are connected by an acquisition line 21.

[0057] Figure 5 Fig. shows a schematic structural diagram of the discharge unit 4 of the present invention. The discharge unit 4 is provided with a power line 41 for connecting with the power battery pack 1.

[0058] In some embodiments,

[0059] The power battery pack 1 includes a power supply port 15 and a signal port 16, and the detection unit 2 is connected to the signal port 16; the power supply port 15 communicates with the positive and negative electrodes of the battery unit 11 in the power battery pack 1, and the discharge unit 4 is connected to the positive and negative electrodes.

[0060] For the power battery pack 1, its connection ports include a power port 15, which is a high-voltage port and is used to connect to the discharge unit 4 and is connected during charging and discharging of the power battery pack. Its structure is a conventional positive and negative copper contact piece; this power port 15 generally also includes a high-voltage box 151, one end of which is connected to the positive and negative electrodes of all battery cells 11, and the voltage collected by all battery cells 11 is processed by transformation and output through the power port 15 connected at the other end; in the present invention, the discharge unit 4 bypasses the high-voltage box 151 and the power port 15 and is directly connected to the positive and negative electrodes of the battery cell 11, reducing voltage conversion, avoiding too fast output speed after boosting, affecting the damage of the power battery pack 1, and having good discharge output stability.

[0061] The connection ports of the traditional power battery pack 1 also include a signal port 16, which is mainly used for external connection of the BMS communication protocol and belongs to a low-voltage port. The signal port 16 is mainly used for collecting internal data of the power battery pack, and its structure is a data acquisition terminal block.

[0062] In some embodiments,

[0063] The data information of the power battery pack 1 includes one or more of the voltage, temperature, current, and power of the power battery pack 1.

[0064] For the power battery packs 1 on the market, since a second acquisition board for battery cells is integrated inside, information such as the voltage, temperature, battery, or power of the battery cells can be collected. For power battery packs of different brands, at least one of the above battery cell information is included; therefore, in the embodiments of the present invention, when obtaining information such as voltage, temperature, current, or power, the control unit 3 can basically determine the discharge time and discharge mode to ensure the stability and safety of discharge.

[0065] In some embodiments,

[0066] The detection unit 2 transmits the data information of the power battery pack 1 to the control unit 3 in the TPC or api manner.

[0067] The TPC or api transmission method can meet the requirements of most control software, is simple and easy to operate, and is convenient for data reprocessing after data transmission.

[0068] In some embodiments,

[0069] The control unit 3 includes a computer, and the computer compares and analyzes the data information of the power battery pack 1 collected by the detection unit 2 in combination with the brand model information of the power battery pack 1 to determine the discharge time for the discharge unit 4 to receive the power battery pack 1.

[0070] The control unit 3 mainly includes a computer, which can pre-store information such as the brand and model of various power battery packs 1. After obtaining the data information of the power battery pack 1 transmitted by the detection unit 2, it can determine the discharge time and the discharge mode.

[0071] On the other hand, the present invention provides a control method for the recycling and discharging device of the power battery pack 1 as described above, including:

[0072] Collect the brand and model information of the power battery pack 1;

[0073] The detection unit 2 collects one or more of the voltage, temperature, current, and power information of the power battery pack 1;

[0074] The control unit 3 collects the detection information of the detection unit 2 and the brand and model information of the power battery pack 1, conducts comparison and analysis, and determines the discharge strategy of the power battery pack 1;

[0075] The discharge unit 4 discharges the power battery pack 1 according to the discharge strategy.

[0076] Figure 6 This is the discharge operation flowchart of the recycling and discharging device of the power battery pack 1 of the present invention. The discharge process mainly includes: recording information such as the brand and model of the power battery pack 1, opening the cover of the power battery pack 1, connecting the low-voltage terminal of the power battery pack 1, connecting the high-voltage terminal of the power battery pack 1, setting the parameters of the control unit 3, turning on the discharge device, and issuing a discharge instruction for the power battery pack 1.

[0077] During the discharge operation of the power battery pack 1, it is first necessary to record information such as the brand and model of the power battery pack 1; this can be obtained from the label on the outer packaging of the power battery pack 1. The structures of power battery packs 1 of the same brand are not very different, which is convenient for the jumper connection of the detection unit 2.

[0078] Since the discharge unit 4 is directly connected to the positive and negative electrodes inside the power battery pack 1, it is necessary to open the cover of the power battery pack 1 for easy connection.

[0079] The wiring methods of all conventional models of power battery packs 1 on the market have been recorded inside the detection unit 2. The wiring methods of different power battery packs are different, but the low-voltage ports of all power battery packs 1 contain four terminal posts; the detection unit 2 is wired to the low-voltage port of the power battery pack 1. Enter the brand model of the power battery pack 1 in the display screen of the control unit 3, and wire according to the pre-stored conventional wiring method in the detection unit 2. The low-voltage port 16 is connected to four connecting wires (namely 12V+, 12V-, CAN L, CAN H respectively; the corresponding pinhole positions are described in the usage instructions of the power battery pack; among them, 12V+ and 12V- are used to provide power for the second acquisition board inside the power battery pack to activate the second acquisition board; while CAN L and CAN H are data acquisition interfaces to collect the information of the power battery pack). If the information cannot be accurately obtained, jumper connection can be used until the accurate information of the power battery pack 1 is obtained.

[0080] Connect the discharge unit 4 to the high-voltage port side of the power battery pack 1, bypass the high-voltage box 151 of the power battery pack 1, and directly connect to the positive and negative electrodes of the battery unit 11. Specifically, the positive and negative electrodes of all battery units 11 are respectively connected to the power line 41 of the discharge unit 4.

[0081] Parameter setting of the control unit 3. According to at least one of the remaining power, current, voltage and temperature of the power battery pack 1 collected by the detection unit 2, set the discharge strategy of the power battery.

[0082] Turn on the discharge device.

[0083] Send a battery pack discharge instruction.

[0084] In some embodiments,

[0085] The discharge mode of the power battery pack 1 includes at least one of constant current discharge, constant voltage discharge and constant current and constant voltage discharge.

[0086] For the three discharge methods of constant current discharge, constant voltage discharge and constant current and constant voltage discharge, they are all conventional discharge modes and can be pre-stored in the control unit 3. According to the situation of the power battery pack 1, different discharge methods are selected for discharge.

[0087] In some embodiments,

[0088] The control method further includes detecting the wiring status of the power battery pack 1 with the detection unit 2 and the discharge unit 4, and the discharge operation can only be performed when all the wirings of the power battery pack 1 are correct.

[0089] Figure 7The safety logic diagram of the power battery pack 1 recycling and discharging device according to an embodiment of the present invention is shown. The safety logic process is to make preparations before the power battery pack 1 discharges, including two aspects. First, the wiring of the low-voltage end of the power battery pack 1 is detected. The detection unit 2 collects information such as the temperature, voltage, and current of the power battery pack 1 and transmits it to the control unit 3. Whether the control unit 3 receives the collected information. If not, it returns to the wiring detection of the low-voltage end; if received, it can be indicated by the low-voltage indicator light being on. Second, the wiring of the high-voltage end of the power battery pack 1 is detected. The discharging unit 4 collects the total positive and negative voltage information of the battery pack and transmits it to the control unit 3. Whether the control unit 3 receives the collected information. If not, it returns to the wiring detection of the high-voltage end again; if received, the high-voltage indicator light can be turned on. Only when the high-voltage indicator light and the low-voltage indicator light are on at the same time can a discharging instruction be issued to the discharging unit 4.

[0090] In the present invention, by the detection unit 2 collecting information of the power battery pack 1, and after the discharging unit 4 is connected to the power battery pack 1, the circuit of the power battery pack 1 will also be detected, so as to provide safety protection for the power battery pack 1. The specific operation can be as follows:

[0091] a. After the wiring of the low-voltage port of the power battery pack 1 is connected, the detection unit 2 collects information such as the temperature, voltage, and current of the battery cells and transmits it to the control unit 3. When the control unit 3 receives the collected information, it issues a judgment instruction. If the low-voltage indicator light is on, the wiring is correct; if the indicator light is not on, the wiring is incorrect and needs to be rechecked and troubleshot.

[0092] b. The power line 41 of the discharging unit 4 is connected to the positive and negative electrodes of the battery unit 11 inside the power battery pack 1. The discharging unit 4 collects the total positive and total negative voltage information of the battery pack and transmits it to the control unit 3. When the control unit 3 receives the collected information, it issues a judgment instruction. If the high-voltage indicator light is on, the wiring is correct; if the indicator light is not on, the wiring is incorrect and needs to be rechecked and troubleshot.

[0093] C. When the low-voltage indicator light and the high-voltage indicator light are on at the same time, the discharging unit 4 can issue a discharging instruction to the battery pack.

[0094] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A power battery pack recycling and discharging device, characterized in that, It includes a detection unit, a control unit and a discharge unit. The detection unit includes a data acquisition module. The data acquisition module includes a communication protocol. The detection unit is connected to the information acquisition board of the power battery pack through the communication protocol and is used to collect the data information of the power battery pack from the information acquisition board of the power battery pack. The control unit is used to generate a discharge instruction based on the data information of the power battery pack and send the discharge instruction to the discharge unit. The discharge unit is electrically connected to the power battery pack and is used to discharge the power battery pack according to the received discharge instruction.

2. The power battery pack recovery and discharge device according to claim 1, characterized in that: The discharge unit consumes the remaining electric energy by doing work and generating heat through a power resistor.

3. The power battery pack recovery and discharge device according to claim 1, characterized in that: The connection mode between the detection unit and the voltage and temperature acquisition board of the power battery pack includes jumper connection.

4. The power battery pack recovery and discharge device according to claim 3, characterized in that: The power battery pack includes a power supply port and a signal port. The detection unit is connected to the signal port; the power supply port connects the positive electrode and the negative electrode of the battery unit in the power battery pack, and the discharge unit is connected to the positive electrode and the negative electrode.

5. The power battery pack recovery and discharge device according to any one of claims 1-4, characterized in that: The data information of the power battery pack includes one or more of the voltage, temperature, current and power of the power battery pack.

6. The power battery pack recovery and discharge device according to claim 5, characterized in that: The detection unit transmits the data information of the power battery pack to the control unit in the TPC or api manner.

7. The power battery pack recovery and discharge device according to any one of claims 1-4 or 6, characterized in that: The control unit includes a computer. The computer performs comparison and analysis based on the data information of the power battery pack collected by the detection unit and in combination with the brand model information of the power battery pack to determine the discharge time for the discharge unit to receive the power battery pack.

8. A control method for a power battery pack recycling and discharging device according to any one of claims 1-7, characterized in that, It includes: Collecting the brand model information of the power battery pack; The detection unit collects one or more of the voltage, temperature, current and power information of the power battery pack; The control unit collects the detection information of the detection unit and the brand model information of the power battery pack, performs comparison and analysis, and determines the discharge strategy of the power battery pack; The discharge unit discharges the power battery pack according to the discharge strategy.

9. The control method according to claim 8, characterized in that: The discharge mode of the power battery pack includes at least one of constant current discharge, constant voltage discharge and constant current and constant voltage discharge.

10. The control method according to claim 9, characterized in that: The control method further includes detecting the wiring status of the power battery pack with the detection unit and the discharge unit, and the discharge operation can only be performed when all the wirings of the power battery pack are correct.

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