CN104103866B - A kind of lithium battery matching method - Google Patents

Abstract

The invention discloses a method for grouping lithium batteries, which comprises the following steps: (1) pick out N*M battery capacity data from qualified battery capacity data, and arrange them in ascending order according to the capacity data; (2) sort N*M The battery data is evenly divided into two halves, the first half of the N*M/2 battery data remains unchanged in ascending order, the second half of the N*M/2 battery data is arranged in descending order of capacity, and the front and rear halves are connected to form the first half The entire section of data that gradually increases and gradually decreases in the second half; (3) divides the entire section of data into N sections on average according to the arrangement order of the entire section of data, and numbers the entire section of data according to the section number + sequence number; each section corresponds to each other in sequence The serial number is the same; (4) Take out the batteries represented by the data with the same serial number in each section and form a parallel group. There are M parallel groups in total, and each parallel group consists of N batteries in parallel; then M parallel groups The groups are connected in series to form a battery module. The invention makes the high and low capacities complement each other when grouping, and improves the consistency of the capacities.

Description

A kind of lithium battery matching method

technical field

The invention relates to lithium batteries, in particular to a lithium battery assembly method.

Background technique

The current prismatic lithium batteries are connected in parallel and connected in series to increase the capacity and voltage. The usual method is to pack the batteries according to the capacity data. The batteries in each group are connected in parallel, and the groups are connected in series.

The requirements for battery packs are to make the difference between the capacity sum of the packs as small as possible. Assembling is a heavy workload and difficult process in the battery pack. The result of the assemblage is related to the cruising range and life of the battery pack.

The existing group matching method is to divide the batteries into different gears, and then take the batteries in proportion to form a group according to the number of batteries in each gear. This method has great blindness, lack of controllability to the results of matching groups, relatively large randomness, and a large workload.

Contents of the invention

The technical problem to be solved by the present invention is to provide a lithium battery assembly method.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a lithium battery assembly method, the lithium battery is composed of N*M single lithium batteries, a battery module in which N batteries are connected in parallel and then M groups are connected in series, including The following steps:

(1) Select N*M battery capacity data from qualified battery capacity data, and arrange them in ascending order of capacity data;

(2) Divide the N*M battery data into two halves, the first half of the N*M/2 battery data remains unchanged in ascending order, and the second half of the N*M/2 battery data is arranged in descending order of capacity , and then splicing the head end of the second half of the data at the end of the first half to form the whole piece of data; the whole piece of data forms an arrangement order in which the first half of the data gradually increases and the second half of the data gradually decreases;

(3) Divide the entire data into N sections evenly according to the order of arrangement, and number the entire data according to the following rules: the number is composed of section number + sequence number, and the section number refers to the number of sections that are evenly divided into the entire section of data The N sections are numbered sequentially; the sequence number refers to the numbering of the M battery data in each section in sequence. Since the number of data in each section is the same as M, the sequence numbers corresponding to each section are the same. of;

(4) Take out the batteries represented by the data with the same sequence number in each section and form a parallel group. There are a total of M parallel groups, and each parallel group is composed of N batteries in parallel; then M parallel groups are connected in series to form a battery module .

In order to ensure the controllability of the target battery module, the capacity data of N*M batteries selected from the qualified batteries in step (1) can be sorted in ascending order after selecting and eliminating the capacity data that deviates from the average value in advance.

The beneficial effects of the present invention are:

Arrange the data of N*M batteries in ascending order of capacity and then divide them into the whole section of data consisting of the first half in ascending order and the second half in descending order, so that the high and low capacities complement each other when pairing groups, reducing the capacity difference between each parallel group , to ensure that the capacity has a good consistency. The method is simple and easy to implement automatic processing.

detailed description

In this embodiment, 50 qualified batteries are randomly selected and assembled into a battery pack of 6 parallel to 7 strings (i.e., N parallel to M strings) as an example. The specific steps are as follows:

(1) First import the capacity data of 50 batteries into excel and sort them in ascending order, remove the capacity data that deviates from the average value, and pick out 42 of them (ie N*M) with better consistency of battery capacity data, and put It is equally divided into two halves, front and rear, from the middle.

(2) The data of the 21 (ie N*M/2) batteries in the first half remain unchanged in ascending order, and the data of the 21 batteries (ie N*M/2) in the second half are sorted in descending order according to capacity, and then the second half The data is spliced after the first half to form a whole piece of data. It should be noted that the arrangement order of the whole piece of data is that the first half is in ascending order, and the second half is in descending order. The following "whole piece of data arrangement order" refers to this arrangement order .

(3) Number the above-mentioned entire section of data according to the method of "section number + sequence number", wherein the section number refers to the 6 sections (that is, N sections) that are evenly divided into the above-mentioned entire section of data and are numbered sequentially from front to back. Here, the section number is divided into It is A01-A06; the sequence number refers to the sequential numbering of the data of the 7 (M) batteries in each section according to the order of the entire section of data, here it is 001-007, and then the section number and the sequence number are connected back and forth to form each battery The serial number of the battery, such as A01001.

The specific number of the battery is as follows:

first half:

A01001, A01002, A01003, A01004, A01005, A01006, A01007;

A02001, A02002, A02003, A02004, A02005, A02006, A02007;

A03001, A03002, A03003, A03004, A03005, A03006, A03007;

the second half:

A04001, A04002, A04003, A04004, A04005, A04006, A04007;

A05001, A05002, A05003, A05004, A05005, A05006, A05007;

A06001, A06002, A06003, A06004, A06005, A06006, A06007;

Table 1 is the result of numbering the battery capacity data.

(4) The data of the remaining 8 batteries (ie more than N*M) have no number (Table 2).

(5) According to the following rules, the batteries are assembled according to the following rules: the batteries corresponding to the sequence number 001 in each section are formed into the 001 group, the batteries corresponding to the sequence number 002 are formed into the 002 group, and so on until the batteries corresponding to the sequence number 007 are formed. 007 groups, so there are 7 groups of batteries in total.

During the specific implementation, the battery identification code is scanned and recorded by the scanner to match the batteries. The matching results are shown in Table 3.

(6) According to the results in Table 3, connect 7 groups of batteries from Group 001 to Group 007 in series, and connect 6 batteries in parallel in each group to form a battery module at last.

Table 1:

Table 2:

table 3:

It can be seen from the results in Table 3 that after grouping according to the above grouping method, the capacity sum difference between the parallel group and the parallel group is small, and the maximum deviation from the average value is only 0.05%, and the deviation from the process requirement in the traditional grouping method is not more than 0.5% % compared to the standard, its consistency has been greatly improved.

The embodiments of the present invention described above are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (2)

1. A lithium battery matching method, wherein the lithium battery is a battery module in which first N batteries are connected in parallel and then M groups are connected in series by N*M single lithium batteries, it is characterized in that it comprises the following steps: (1) Select N*M battery capacity data from qualified battery capacity data, and arrange them in ascending order of capacity data; (2) Divide the N*M battery data into two halves, the first half of the N*M/2 battery data remains unchanged in ascending order, and the second half of the N*M/2 battery data is arranged in descending order of capacity , and then splicing the head end of the second half of the data at the end of the first half to form the whole piece of data; the whole piece of data forms an arrangement order in which the first half of the data gradually increases and the second half of the data gradually decreases; (3) Divide the entire data into N sections evenly according to the order of arrangement, and number the entire data according to the following rules: the number is composed of section number + sequence number, and the section number refers to the number of sections that are evenly divided into the entire section of data The N sections are numbered sequentially; the sequence number refers to the numbering of the M battery data in each section in sequence. Since the number of data in each section is the same as M, the sequence numbers corresponding to each section are the same. of; (4) Take out the batteries represented by the data with the same sequence number in each section and form a parallel group. There are a total of M parallel groups, and each parallel group is composed of N batteries in parallel; then M parallel groups are connected in series to form a battery module . 2. The lithium battery grouping method according to claim 1, characterized in that: in step (1), the capacity data of N*M batteries are selected from the qualified batteries, and the capacity data that deviate from the average value are selected in advance and the capacity data that deviates from the average value are eliminated Then sort in ascending order.