A visual battery pack design method

Abstract

The present invention relates to a visual battery pack design method, comprising the steps of: receiving the battery pack shell structure size and custom parameters sent by the front end, and generating a shell feature interface code. The present invention specially encodes the shell features, battery cell features, and protection board components, thereby avoiding the traditional use of databases to record the huge and cumbersome device data information, and improving the design operation speed; by setting preset rules, the correlation of various components in the design is standardized, and the dependence on human work experience is reduced. Standard verification tests can reduce the time of human research and development and testing, which is conducive to battery design engineers to quickly design a battery pack that emphasizes both safety and performance.

Description

Technical Field

[0001] The present invention relates to the technical field of battery design and manufacturing, and more specifically, to a visualized battery pack design method. Background Art

[0002] With the rapid development of battery technology, there are more and more types and models of batteries. Traditional single cells can no longer meet the market demand. The battery pack composed of several battery modules is designed in a combined way to supply power to the outside world, which can meet the needs of different usage scenarios. The design and manufacture of battery packs require not only rich electrochemical knowledge, but also a large number of production practice parameters and experience. In the entire battery pack production process, the design and production process parameters have an impact on the performance of the final product.

[0003] The current battery pack design requires battery design engineers to be familiar with various domestic and international battery standards. According to the requirements of these domestic and international battery standards, combined with actual relevant work experience, comprehensive analysis and design of parameters such as battery cells, voltage combinations, battery capacity, and overall combinations are carried out. After the design is completed, the battery protection board is designed, and finally a lot of manpower and time are invested to test the safety and performance of the battery pack. The battery pack design and development process requires a high level of technical skills from battery design engineers, and also requires manpower and time, and the design cost is very high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent and visualized battery pack design method in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A visual battery pack design method includes the following steps:

[0007] Receive the battery pack shell structure size and customization parameters sent by the front end, and generate the shell feature interface code;

[0008] Obtaining a preset rule 1 related to the shell feature interface code;

[0009] According to the preset rule 1, analyzing the shell characteristic interface code to obtain a matching cell characteristic interface code, and sending the cell corresponding to the cell characteristic interface code to the front end;

[0010] Obtaining a second preset rule related to the cell characteristic interface code;

[0011] According to the preset rule 2, analyzing the cell characteristic interface code to obtain cell combination parameters, and sending the cell combination parameters to the front end;

[0012] Acquire simulation operation parameters related to the battery cell combination parameters;

[0013] According to the simulation operation parameters, the protection board devices available in the preset library of matching battery protection board devices are analyzed, a protection board device interface code is generated, and the protection board device corresponding to the protection board device interface code is sent to the front end;

[0014] Screening and designing the battery cells, the battery cell combination parameters and the protection board components received by the front end to obtain the battery pack housing structure data and battery pack parameter data generated by the design;

[0015] A standard verification test is performed on the battery pack and the parameter data, and the standard verification test result is fed back to the front end.

[0016] Furthermore, the shell feature interface code, the battery cell feature interface code, and the protection board device interface code are all provided with a category bit, a number bit, a parameter bit, and a check bit.

[0017] Furthermore, it specifically includes: the preset rule 1 records the matching correspondence between the battery pack housing and the battery cell; the preset rule 2 records the matching relationship between the battery cell and the battery cell combination parameter; the preset rule 1 and the preset rule 2 can be customized, edited and rewritten.

[0018] Furthermore, it also includes: customizing and editing the preset rule 1, the preset rule 2 and the simulation operation parameters and storing them as an application scenario preset solution, and sending them to the front end.

[0019] Furthermore, it also includes: selecting the application scenario preset solution received by the front end to obtain the designed and generated battery pack and the parameter data.

[0020] Furthermore, the standard verification test also includes: verifying the parameter data according to a preset national battery standard or international battery standard data.

[0021] Furthermore, the parameter data also includes: charging overcurrent protection parameters, short-circuit overcurrent protection parameters, discharge overcurrent protection parameters, charging overcharge voltage parameters and discharge protection voltage parameters.

[0022] Furthermore, the standard verification test also includes: voltage detection, current detection, time control, temperature detection and communication protocol.

[0023] Furthermore, the battery pack can select a communication bus interface and a custom communication protocol.

[0024] Furthermore, the front end may perform a dragging and dropping visualization operation on the received battery cells, the battery cell combination parameters and the protection board components.

[0025] The beneficial effects of the present invention are as follows: the shell features, battery cell features, and protection board components are specially coded, thereby avoiding the traditional use of databases to record the bulky and cumbersome device data information, thereby improving the design operation speed; by setting preset rules, the correlation between the various components in the design is standardized, reducing the dependence on human work experience, and standard verification tests can reduce the time for human research and development and testing, which is conducive to battery design engineers to quickly design a battery pack that emphasizes both safety and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0027] Figure 1 is a flow chart of a visualized battery pack design method according to an embodiment of the present invention;

[0028] Figure 2 is a schematic reference diagram of a cell characteristic interface code of a visualized battery pack design method according to an embodiment of the present invention;

[0029] Figure 3 It is a visualized state diagram of a battery pack design method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be described clearly and completely in combination with the technical solution in the embodiments of the present invention. Obviously, the described embodiments are partial embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0031] like Figures 1 to 3 As shown, the present invention provides a visualized battery pack design method, comprising the following steps:

[0032] Receive the battery pack shell mechanism size and custom parameters sent by the front end, and generate a shell feature interface code, wherein the battery pack shell mechanism size and custom parameters can be manually input by the user, or the size can be determined by selecting preset parameters through a menu;

[0033] Obtain preset rule one related to the shell feature interface code, and the preset rule one can be regarded as an association rule set between the category bit, parameter bit in the shell feature interface code and the category bit, number bit, and parameter bit of the battery cell feature interface code. For example, if the parameter bit in the shell feature interface code is provided with a size parameter, then the size parameter of the battery cell feature interface code is matched and screened. One of the innovations of the present technical solution is to encode and identify the shell features, battery cell features, and protection board devices using specially designed codes (category bit, number bit, parameter bit, and check bit). The category bit of the code can identify the type of the device, the number bit can identify the specific model of the device, the parameter bit can identify the current, voltage and other information of the device, and the check bit can be used to verify whether devices can be adapted for combination.

[0034] According to the preset rule 1, analyzing the shell characteristic interface code to obtain a matching cell characteristic interface code, and sending the cell corresponding to the cell characteristic interface code to the front end;

[0035] Acquire a second preset rule related to the cell feature interface code, wherein the second preset rule is a corresponding association rule between the cell feature interface code of the cell and a cell combination parameter;

[0036] According to the preset rule 2, analyzing the cell characteristic interface code to obtain cell combination parameters, and sending the cell combination parameters to the front end;

[0037] Acquire simulation operation parameters related to the battery cell combination parameters;

[0038] According to the simulation operation parameters, the protection board devices available in the preset library of matching battery protection board devices are analyzed, a protection board device interface code is generated, and the protection board device corresponding to the protection board device interface code is sent to the front end;

[0039] Screening and designing the battery cells, the battery cell combination parameters and the protection board components received by the front end to obtain the battery pack housing structure data and battery pack parameter data generated by the design;

[0040] A standard verification test is performed on the battery pack and the parameter data, and the standard verification test result is fed back to the front end.

[0041] The shell feature interface code, the battery cell feature interface code, and the protection board device interface code are all provided with a category bit, a number bit, a parameter bit, and a check bit. The shell feature interface code, the battery cell feature interface code, and the protection board device interface code are like combination building blocks, and they can only be matched and used when the interface codes are associated and correspond.

[0042] Specifically, the preset rule 1 records the matching relationship between the battery pack housing and the battery cell; the preset rule 2 records the matching relationship between the battery cell and the battery cell combination parameters; the preset rule 1 and the preset rule 2 can be edited and rewritten by users.

[0043] It also includes: customizing and editing the preset rule 1, the preset rule 2 and the simulation operation parameters and storing them as application scenario preset solutions, and sending them to the front end.

[0044] It also includes: selecting the application scenario preset solution received by the front end, and obtaining the designed and generated battery pack and the parameter data.

[0045] The standard verification test also includes: verifying the parameter data according to a preset national battery standard or international battery standard data.

[0046] The parameter data also includes: charging overcurrent protection parameters, short circuit overcurrent protection parameters, discharge overcurrent protection parameters, charging overcharge voltage parameters and discharge protection voltage parameters.

[0047] The standard verification test also includes: voltage detection, current detection, time control, temperature detection and communication protocol.

[0048] The battery pack can select a communication bus interface and a custom communication protocol.

[0049] The front end can perform a dragging and visualizing operation on the received battery cells, the battery cell combination parameters and the protection board components.

[0050] An example of the step of "screening and designing the received battery cells, the battery cell combination parameters and the protection board components through the front end to obtain the designed and generated battery pack housing structure data and battery pack parameter data":

[0051] Battery cell parameters:

[0052] Parameter name Parameter requirements Design capacity 50AH and above Nominal voltage 29.6V Battery Cell Magic brand cylindrical ternary lithium Normal discharge current 50A Peak discharge current 80A Charging overcurrent 15A Ambient temperature -40～50℃ Charging overvoltage 4.25V Discharge overvoltage 3.0V Volume requirements 500*500*600

[0053] The first step is to analyze the battery: the battery requires Magic brand cylindrical ternary lithium and requires working at -40 degrees. According to the database, the commonly used battery cells are INR-18650-P26A and INR-21700-P42A.

[0054] The second step is to analyze the voltage combination: the nominal voltage is 29.6V. Based on the nominal voltage of a single battery cell in the first step of 3.7V, the number of battery cells in the battery pack is 29.6 / 3.7=8 strings.

[0055] The third step is to analyze the capacity combination: the design capacity is required to be above 50AH. If P26A, i.e. a single cell of 2600mah, is used, then at least 50 / 2.6=19.23 is required, i.e. 20 cells need to be connected in parallel; if P42A, i.e. a single cell of 4.2ah, is selected, then at least 50 / 4.2=11.9 is required, i.e. 12 cells need to be connected in parallel.

[0056] Step 4: Overall combination analysis: If the INR-18650 battery cell is selected with a diameter of 18mm and a length of 65mm, plus the tolerance and connection point size, the battery cell combination can meet the requirements based on a diameter of 20mm and a length of 70mm. If the INR-21700-P42A is selected, the battery cell size is calculated as 25mm and 75mm, plus the space for the protection board, it can meet the requirements.

[0057] Step 5: Confirm the various protection parameters of the battery. The over-voltage requirement is 4.25V, and the operating environment may reach a high-voltage environment of 60°C. When the customer enters this requirement, according to the data in the system database, under normal circumstances, the recommended full-charge voltage at 60°C is 4.15V, and the over-charge voltage is 4.2V. Suggest whether the customer needs to modify it.

[0058] The discharge cut-off voltage requirement is 3.0V. Since it will be used in a low temperature environment of -40 degrees Celsius, according to the information in the database, the discharge area of ​​the battery cell can reach 2.8V, and it is easy to trigger the 3.0V point. Most application scenarios are set to 2.8V protection. Therefore, it is recommended to set the overvoltage protection to 2.8V.

[0059] After the battery cell assembly is completed, the next step is to design the protection board.

[0060] From the above analysis, we can derive the core design parameters of the protection board:

[0061] parameter Parameter Description Parameter Value unit CCD Charging overcurrent protection 15 A SCD Short circuit overcurrent protection 300 A OCD Discharge overcurrent protection 150 A OV Overcharge voltage 4.15 V UV Discharge protection voltage 2.8 V

[0062] Device Selection:

[0063] 1. Choice of analog front end: For 8-string design, you can choose SH367305 from Sinowin, BQ76930 from TI, or JW3370 from JWH. Assuming the customer chooses BQ76930

[0064] 2. Selection of switch tube:

[0065] a. For the 8-string design, the full voltage is 8*4.2=33.6V, so the recommended parameter switch VBDDS is not less than 60V

[0066] b. Peak current 80A, that is, the switch tube will not be damaged when the entire system is running at 80A continuously. The design requires that the switch tube work in an environment with a maximum temperature of 50℃. Assuming that the temperature of the switch tube cannot exceed 100℃, it means that when the switch tube works at 150A, the maximum temperature difference cannot exceed 50℃. According to the characteristics of MOSFET, 1W consumption will increase the temperature by 60℃, which means that the loss of a single switch tube cannot exceed 0.83W. Assuming that 3 milliohms of switch tubes are selected, the loss of the switch tube is I*I*R<0.83. After conversion, the current of a single switch tube should be less than 15A. 15*15*0.003*1.13 (1.13 is the temperature difference coefficient of the switch tube)=0.76W. Based on the design of 80A, 6 switch tubes need to be connected in parallel.

[0067] c. If it is a same-port design, there are 6 discharge tubes and 6 charging tubes, that is, at least 12 switch tubes are needed as protection switch tubes; if it is a separate-port design, the charging protection current is 15A, and theoretically only one switch tube is needed.

[0068] d. In addition to current design considerations, if the customer adds a temperature protection function, the switch tube can be appropriately reduced according to the situation.

[0069] 3. External temperature detection, for example, 4 are required, and 6 at most.

[0070] 4. Communication requirements

[0071] 5. Other requirements

[0072] Through the analysis of the protection board components, the design includes:

[0073] Serial number Parameter content illustrate 1 Voltage detection Determine overvoltage, low voltage and other protection 2 Current Sensing Determine overcurrent protection 3 Time Control Detection time and recovery time of various protections 4 SOC How to calculate power 5 Temperature detection Set over-temperature or disconnection protection 6 Communication Protocol Design according to customer needs 7 BQ76940 main function design 8 Sleep Processing Sleep and wake-up design 9 Other additional content

[0074] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A visual battery pack design method, characterized in that: The steps include: Receive the battery pack shell structure size and customization parameters sent by the front end, and generate the shell feature interface code; Obtaining a preset rule 1 related to the shell feature interface code; According to the preset rule 1, analyzing the shell characteristic interface code to obtain a matching cell characteristic interface code, and sending the cell corresponding to the cell characteristic interface code to the front end; Obtaining a second preset rule related to the cell characteristic interface code; According to the preset rule 2, analyzing the cell characteristic interface code to obtain cell combination parameters, and sending the cell combination parameters to the front end; Acquire simulation operation parameters related to the battery cell combination parameters; According to the simulation operation parameters, the protection board devices available in the preset library of matching battery protection board devices are analyzed, a protection board device interface code is generated, and the protection board device corresponding to the protection board device interface code is sent to the front end; Screening and designing the battery cells, the battery cell combination parameters and the protection board components received by the front end to obtain the battery pack housing structure data and battery pack parameter data generated by the design; The parameter data also includes: charging overcurrent protection parameters, short circuit overcurrent protection parameters, discharge overcurrent protection parameters, charging overcharge voltage parameters and discharge protection voltage parameters; Performing a standard verification test on the battery pack and the parameter data, and feeding back the standard verification test result to the front end; The shell feature interface code, the cell feature interface code, and the protection board device interface code are all provided with a category bit, a number bit, a parameter bit, and a check bit; The preset rule 1 records the matching relationship between the battery pack housing and the battery cell; the preset rule 2 records the matching relationship between the battery cell and the battery cell combination parameters; the preset rule 1 and the preset rule 2 can be edited and rewritten by users.

2. A visual battery pack design method as claimed in claim 1, characterized in that: Also includes: The preset rule 1, the preset rule 2 and the simulation operation parameters are customized and edited and stored as an application scenario preset solution, and sent to the front end.

3. A visual battery pack design method as claimed in claim 2, characterized in that: Also includes: The application scenario preset solution received by the front end is selected to obtain the designed and generated battery pack and parameter data.

4. A visual battery pack design method as claimed in claim 1, characterized in that: The standard verification test also includes: verifying the parameter data according to a preset national battery standard or international battery standard data.

5. A visual battery pack design method as claimed in claim 4, characterized in that: The standard verification test also includes: voltage detection, current detection, time control, temperature detection and communication protocol.

6. A visual battery pack design method as claimed in claim 1, characterized in that: The battery pack can select a communication bus interface and a custom communication protocol.

7. A visualized battery pack design method according to any one of claims 1 to 6, characterized in that: The front end can perform a dragging and visualizing operation on the received battery cells, the battery cell combination parameters and the protection board components.

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