A composite acquisition circuit for single-cell voltage and temperature of explosion-proof battery system and its data sorting control method

Abstract

The present invention discloses a composite data acquisition circuit for single-cell voltage and temperature in an explosion-proof battery system and a data sorting control method thereof. The circuit relates to the field of single-cell battery data acquisition technology. The circuit includes battery management chips U0-U2, a main control chip U3, and connectors CON1-CON2. Both battery management chips U1 and U2 are capable of acquiring voltages from 12 strings of cells and temperatures from 2 strings of cells. Battery management chip U0 is capable of acquiring temperatures from 16 strings of cells. The communication ports of battery management chips U0-U2 are all connected to the communication port of main control chip U3. The present invention employs a 20+20 composite data acquisition technology that can match the battery connection numbers of a battery pack with the data acquisition numbers marked on the connectors. This greatly simplifies the design of the data acquisition wiring harness, facilitates the safety control of explosion-proof processes, and makes explosion-proof battery systems safer and more reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of single cell battery data acquisition, and in particular to a single cell voltage and single cell temperature composite acquisition circuit for an explosion-proof battery system and a data sorting control method thereof. Background Art

[0002] In the field of explosion-proof electric vehicles, according to relevant explosion-proof regulations, all cell voltages and temperatures of explosion-proof battery systems must be collected and subjected to corresponding safety testing and control to ensure safe use. When designing and manufacturing such explosion-proof battery systems, the industry commonly uses two types of BMS acquisition slaves: voltage acquisition slaves (BMUs) and temperature acquisition slaves (BTUs), which respectively collect cell voltages and cell temperatures. This acquisition design results in a large number of connectors in the acquisition harness and is prone to cross-wiring. The slightest negligence in the wiring harness process can lead to mutual interference and even the risk of short circuits due to cross-wiring. This may not only cause certain errors or instability in battery data acquisition, affecting the performance of the battery system, but may also introduce certain safety hazards to the operation of the explosion-proof battery system. Summary of the Invention

[0003] In response to the problems in the existing technology, the present invention proposes a new acquisition solution, namely, adopting a 20+20 composite acquisition technology. Specifically, two battery management chips LTC6803 with the ability to collect 12 strings of single cell voltages and 2 strings of single cell temperatures, and one battery management chip ADS7953 with the ability to collect 16 strings of single cell temperatures are adopted, thereby combining them into a composite acquisition slave that can collect 20 strings of single cell voltages and 20 strings of single cell temperatures. Each composite acquisition slave is connected to the explosion-proof battery pack through two connectors, respectively, to collect battery data of 20 strings of single cell voltages and 20 strings of single cell temperatures.

[0004] In order to achieve the above object, the present invention is specifically implemented through the following technical solutions:

[0005] A composite acquisition circuit for single-cell voltage and single-cell temperature of an explosion-proof battery system includes battery management chips U0-U2, a main control chip U3, and connectors CON1-CON2. Both the battery management chip U1 and the battery management chip U2 are battery management chips with 12-string single-cell voltage acquisition capabilities and 2-string single-cell temperature acquisition capabilities. The battery management chip U0 is a battery management chip with 16-string single-cell temperature acquisition capabilities. The communication ports of the battery management chips U0-U2 are all connected to the communication port of the main control chip U3. The B- and B1-B10 acquisition ports of the battery management chip U1 are respectively connected to the B- and corresponding serial numbers of the connector CON1, the B1-B10 acquisition ports of the battery management chip U2 are connected to the B11-B20 of the connector CON1 in sequence according to the serial numbers, and the B- of the battery management chip U2 is connected to the B10 of the connector CON1. ​​The T- and T The acquisition ports 1 to T16 are respectively connected to the T- and corresponding serial numbers of the connector CON2 in sequence. The acquisition signals T1 and T2 of the battery management chip U1 are respectively connected to T17 and T18 of the connector CON2. The acquisition signals T1 and T2 of the battery management chip U2 are respectively connected to T19 and T20 of the connector CON2. The B- of the battery management chip U1 and the battery management chip U2 are respectively connected to T16 and T18 of the connector CON2; the 10 voltage acquisition signals of the battery management chip U1 and the battery management chip U2 constitute 20 strings of single-cell voltage acquisition signals, and are connected to the external battery through the connector CONV; the 2 temperature acquisition signals of the battery management chip U1 and the battery management chip U2 and the 16 single-cell temperature acquisition signals of the battery management chip U0 constitute 20 strings of single-cell temperature acquisition signals, and are connected to the external battery through the connector CONT.

[0006] Preferably, the battery management chip U1 and the battery management chip U2 are battery management chips LTC6803.

[0007] Preferably, the battery management chip U0 is a battery management chip ADS7953.

[0008] The present invention has the following beneficial effects:

[0009] The technical solution designed in the present invention can significantly reduce the use of connectors, make the battery pack's collection harness easy to standardize the routing, effectively avoid the interference caused by the collection harness's mistracking and crossing and the possible short circuit hidden dangers, and the routing is clear and easy to maintain later.

[0010] In addition, due to the limitations of explosion-proof specifications, the total number of explosion-proof battery strings does not exceed 100 strings. However, on the market, explosion-proof battery systems with specifications of 100 strings or close to 100 strings are very common. The 20+20 composite acquisition technology adopted by the present invention can match the battery connection serial numbers of the battery pack with the acquisition serial numbers marked on the connector of the present invention one by one, which will greatly simplify the design of the acquisition wiring harness, facilitate the safety control of the explosion-proof process, and make the explosion-proof battery system safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 This is a composite acquisition circuit diagram of Example 1 of the present invention;

[0013] Figure 2 This is a flow chart of the cell voltage acquisition data sorting control method in Example 2 of the present invention;

[0014] Figure 3 This is a flow chart of the monomer temperature acquisition data sorting control method in Example 3 of the present invention. DETAILED DESCRIPTION

[0015] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] Example 1

[0017] like Figure 1 As shown, this embodiment 1 provides a combined cell voltage and cell temperature acquisition circuit for an explosion-proof battery system. The circuit comprises battery management chips U0-U2, a main control chip U3, and connectors CON1-CON2. Cell management chips U1-U2 are LTC6803 battery management chips capable of acquiring voltages from 12 strings of cells and temperatures from 2 strings of cells, while cell management chip U0 is an ADS7953 battery management chip capable of acquiring temperatures from 16 strings of cells. The communication ports of battery management chips U0-U2 are all connected to the communication port of main control chip U3, and the three battery management chips share one main control chip U3.

[0018] In this embodiment, the B- and B1 to B10 acquisition ports of the battery management chip U1 are connected to the B- and corresponding serial numbers of the connector CON1 in sequence, the B1 to B10 acquisition ports of the battery management chip U2 are connected to the B11 to B20 of the connector CON1 in sequence according to the serial numbers, and the B- of the battery management chip U2 is connected to the B10 of the connector CON1, so that U1 to U2 form a circuit relationship for series acquisition, realizing the sequential acquisition of 20 strings of single cell voltages; the T- and T1 to T16 acquisition ports of the battery management chip U0 are connected to the connector CON1. The T- and corresponding serial numbers of the connector CON2 are connected in sequence, the acquisition signals T1 and T2 of the battery management chip U1 are connected to T17 and T18 of the connector CON2 respectively, the acquisition signals T1 and T2 of the battery management chip U2 are connected to T19 and T20 of the connector CON2 respectively, and the B- of the battery management chips U1~U2 are connected to T16 and T18 of the connector CON2 respectively, so that the battery management chips U0 and U1~U2 form a circuit relationship for series acquisition, realizing the sequential acquisition of 20 strings of monomer temperatures.

[0019] According to the above-mentioned acquisition signal connection relationship, the 10 voltage acquisition signals of each single-cell voltage acquisition chip U1~U2 constitute 20 strings of single-cell voltage acquisition signals, and are connected to the external battery through the connector CONV; the 2 temperature acquisition signals of each single-cell voltage acquisition chip U1~U2 and the 16 single-cell temperature acquisition signals of the single-cell temperature acquisition chip U0 constitute 20 strings of single-cell temperature acquisition signals, and are connected to the external battery through the connector CONT.

[0020] Example 2

[0021] Based on Example 1, this Example 2 provides a data sorting control method for a composite acquisition circuit. In this embodiment, the sorting of the composite acquisition data should be consistent with the serial number of the battery pack in order to correctly display or interact with other devices. The data sorting control method can be found in the flow chart. Figure 2 and process Figure 3 shown.

[0022] (1) Single-cell voltage acquisition data sorting control method (such as Figure 2 ), including the following steps:

[0023] 1.1: Initialization;

[0024] 1.2: Read the total number of single battery calibrations n;

[0025] 1.3: Maximum serial number m of the acquisition chip: IF(INT(n / 10)=n / 10,n / 10,INT(n / 10)+1);

[0026] Divide the total number of single battery calibrations n read by the maximum number of single battery voltage acquisition chips. If the number is divisible, the chip with the largest serial number m is the quotient; if the number is not divisible, the quotient is the integer + 1. When m is greater than 2, the subsequent chip serial numbers m are automatically increased by 1 until the sorting is completed.

[0027] 1.4: Maximum serial number x of the single cell on the m-1th chip: IF (m>=2,10,n);

[0028] The maximum serial number X of the single battery on the mth chip: IF(m>=2,n-(m-1)*10,"");

[0029] Compare the calculated maximum chip number m. If it is 2 or greater, directly assign the chip's maximum acquisition setting number (10 in this embodiment) to the m-1th chip as the maximum number x of its connected single cells. The maximum single cell number X on the mth chip is then n-(m-1)*10. If m is 1, directly assign the value n to the current chip's x.

[0030] 1.5: Sort the calculated x values ​​and X values ​​naturally and transmit them to the display device or interact with other devices;

[0031] Example: When n is 20, then m = 2, x on the first chip, battery management chip U1, is 10, and X on the second chip, battery management chip U2, is 10; when n = 96, then m = 10, x on the ninth chip is 10, and X on the tenth chip is 6, and the maximum number of single cells is 96;

[0032] 1.6: Ended.

[0033] (2) Monomer temperature acquisition data sorting control method (such as Figure 3 ), including the following steps:

[0034] 2.1: Initialization;

[0035] 2.2: Read the total number of single battery calibrations n;

[0036] 2.3: Maximum serial number M of the main acquisition chip: IF(INT(n / 16)=n / 16,n / 16,INT(n / 16)+1);

[0037] Divide the total number of single-cell calibrations n read by the maximum number of acquisitions of the main acquisition chip. If it is divisible, the chip's maximum serial number M is the quotient of the divisible number; if it is not divisible, it is the integer of the quotient + 1; when M is greater than 2, the subsequent chip serial numbers are automatically increased by 1 until the sorting is completed;

[0038] 2.4: Maximum serial number x' of the single cell on the M-1th main acquisition chip: IF(M>=2,16,n);

[0039] The maximum serial number X' of the single cell on the Mth main acquisition chip: IF(MOD(n,16)>4,IF(M>=2,n-(M-1)*16,""),"");

[0040] The maximum serial number y of the single battery on the M'-1 auxiliary acquisition chip: IF(n>16,IF(MOD(n,16)<=4,IF(MOD(n,16)-2>0,2,MOD(n,16)),""),"");

[0041] The maximum serial number Y of the single battery on the M'th auxiliary acquisition chip: IF(n>18,IF(MOD(n,16)<=4,IF(MOD(n,16)-2>0,MOD(n,16)-2,""),""),"");

[0042] Compare the calculated maximum serial number M value of the main acquisition chip. If it is 2 or above, directly assign the maximum acquisition number (16 in this embodiment) of the main acquisition chip (battery management chip U2) to the M-1th chip as the maximum serial number x' value of its connected single battery. The maximum single battery serial number X' value on the Mth main acquisition chip is n-(M-1)*16. If M is 1, directly assign the value of n to X' of the current chip. If the modulo remainder of n is not greater than 4, enable the auxiliary acquisition chip (battery management chips U0~U1 in this embodiment) and determine the remainder by subtracting 2. If it is greater than 0, enable the battery management chips U0~U1. The maximum acquisition serial number y of the battery management chip U0 is directly assigned to 2, and the maximum acquisition serial number Y of the M'th chip is MOD(n,16)-2.

[0043] 2.5: Naturally sort the x' and X' values ​​calculated by the main acquisition chip (battery management chip U0) and the y and Y values ​​calculated by the auxiliary acquisition chips (battery management chips U1~U2), and transmit them to the display device or interact with other devices;

[0044] 2.6: End.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A composite acquisition circuit for single cell voltage and temperature of an explosion-proof battery system, characterized in that: Includes battery management chips U0~U2, main control chip U3 and connectors CON1~CON2; The battery management chip U1 and the battery management chip U2 are both battery management chips with 12 strings of single-cell voltage acquisition capabilities and 2 strings of single-cell temperature acquisition capabilities. The battery management chip U0 is a battery management chip with 16 strings of single-cell temperature acquisition capabilities. The communication ports of the battery management chips U0 to U2 are all connected to the communication port of the main control chip U3; The B- and B1 to B10 acquisition ports of the battery management chip U1 are connected to the B- and corresponding serial numbers of the connector CON1 respectively, the B1 to B10 acquisition ports of the battery management chip U2 are connected to the B11 to B20 of the connector CON1 in sequence according to the serial numbers, and the B- of the battery management chip U2 is connected to the B10 of the connector CON1; The T- and T1 to T16 acquisition ports of the battery management chip U0 are respectively connected to the T- and corresponding serial numbers of the connector CON2 in sequence. The acquisition signals T1 and T2 of the battery management chip U1 are respectively connected to T17 and T18 of the connector CON2. The acquisition signals T1 and T2 of the battery management chip U2 are respectively connected to T19 and T20 of the connector CON2. The B- of the battery management chip U1 and the battery management chip U2 are respectively connected to T16 and T18 of the connector CON2. The 10 voltage acquisition signals of the battery management chip U1 and the battery management chip U2 constitute 20 strings of single-cell voltage acquisition signals, and are connected to the external battery through the connector CONV; the 2 temperature acquisition signals of the battery management chip U1 and the battery management chip U2 and the 16 single-cell temperature acquisition signals of the battery management chip U0 constitute 20 strings of single-cell temperature acquisition signals, and are connected to the external battery through the connector CONT; The method for sorting and controlling the cell voltage collection data based on the cell voltage and cell temperature composite collection circuit of the explosion-proof battery system includes the following steps: S1: Initialization; S2: Read the total number of single battery calibrations n; S3: Maximum serial number m of the acquisition chip: IF(INT(n / 10)=n / 10,n / 10,INT(n / 10)+1); Divide the total number of single battery calibrations n read by the maximum number of single battery voltage acquisition chips. If the number is divisible, the chip with the largest serial number m is the quotient; if the number is not divisible, the quotient is the integer + 1. When m is greater than 2, the subsequent chip serial numbers m are automatically increased by 1 until the sorting is completed. S4: the maximum serial number x of the single cell on the m-1th chip: IF (m>=2,10,n); The maximum serial number X of the single battery on the mth chip: IF(m>=2,n-(m-1)*10,""); Compare the calculated maximum chip number m value. If it is 2 or above, directly assign the chip's maximum acquisition setting number 10 to the m-1th chip as the maximum serial number x value of its connected single cell. The maximum single cell serial number X value on the mth chip is n-(m-1)*10. If m is 1, directly assign the n value to the current chip's x value. S5: naturally sort the calculated x values ​​and X values ​​and transmit them to a display device or interact with other devices; When n is 20, then m = 2, x on the first chip, namely the battery management chip U1, is 10, and X on the second chip, namely the battery management chip U2, is 10; when n = 96, then m = 10, x on the ninth chip is 10, and X on the tenth chip is 6, and the maximum order of single cells is 96; S6: End; The monomer temperature acquisition data sorting control method includes the following steps: K1: Initialization; K2: Read the total number of single battery calibrations n; K3: Maximum serial number of the main acquisition chip M: IF(INT(n / 16)=n / 16,n / 16,INT(n / 16)+1); Divide the total number of single-cell calibrations n read by the maximum number of acquisitions of the main acquisition chip. If it is divisible, the chip's maximum serial number M is the quotient of the divisible number; if it is not divisible, it is the integer of the quotient + 1; when M is greater than 2, the subsequent chip serial numbers are automatically increased by 1 until the sorting is completed; K4: the maximum serial number x' of the single cell on the M-1th main acquisition chip: IF (M>=2,16,n); The maximum serial number X' of the single cell on the Mth main acquisition chip: IF(MOD(n,16)>4,IF(M>=2,n-(M-1)*16,""),""); The maximum serial number y of the single battery on the M'-1 auxiliary acquisition chip: IF(n>16,IF(MOD(n,16)<=4,IF(MOD(n,16)-2>0,2,MOD(n,16)),""),""); The maximum serial number Y of the single battery on the M'th auxiliary acquisition chip: IF(n>18,IF(MOD(n,16)<=4,IF(MOD(n,16)-2>0,MOD(n,16)-2,""),""),""); Among them, the main acquisition chip is the battery management chip U2, and the auxiliary acquisition chip is the battery management chip U0~U1; Compare the calculated maximum serial number M value of the main acquisition chip. If it is 2 or above, directly assign the maximum acquisition number 16 of the main acquisition chip to the M-1th chip as the maximum serial number x' value of its connected single battery. The maximum single battery serial number X' value on the Mth main acquisition chip is n-(M-1)*16; if M is 1, directly assign the value of n to X' of the current chip; if the modulo remainder of n is not greater than 4, enable the auxiliary acquisition chip and determine the remainder by subtracting 2. If it is greater than 0, enable the battery management chips U0~U1, among which the maximum acquisition serial number y of the battery management chip U0 is directly assigned to 2, and the maximum acquisition serial number Y value of the M'th chip is MOD(n,16)-2; K5: Naturally sort the calculated x' value and X' value of the battery management chip U0 and the y value and Y value of the battery management chips U1 to U2, and transmit them to the display device or interact with other devices; K6: End.

2. The composite acquisition circuit according to claim 1, characterized in that: The battery management chip U1 and the battery management chip U2 are battery management chips LTC6803.

3. The composite acquisition circuit according to claim 1, characterized in that: The battery management chip U0 is a battery management chip ADS7953.

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