Battery cluster parallel combination dynamic switching method

Abstract

The invention relates to a battery cluster parallel combination dynamic switching method, which comprises the following steps: S1, obtaining the total number N of battery clusters, and sorting the number of battery clusters required by n different battery stacks according to the numerical value D1lt; d2lt; t,..., t; dn; s2, judging whether the number N of the battery clusters is an integral multiple of the number of the battery clusters required by different battery stacks or not; s3, constructing a battery stack basic grouping structure, performing basic grouping on the total number N of the battery clusters on the basis of the battery stack with the minimum number of the required battery clusters, and connecting the battery clusters in the battery stack by adopting a parallel structure; s4, re-grouping part of the basic groups to form a plurality of extended groups, and finally forming a final group formed by combining the basic groups and the extended groups; and S5, forming each corresponding cell stack, and dynamically switching the corresponding cell stacks according to the number of the cell clusters required to be used. According to the invention, rapid response can be made according to dynamic supply and demand changes, and dynamic switching of the battery clusters is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of battery management, and in particular relates to a method for dynamically switching a battery cluster parallel combination. Background Art

[0002] In the existing battery module design, the number of batteries in series and parallel is determined before production, which limits the battery module to adapt to different working conditions only according to the established series and parallel configuration. If there is a need to adjust the series and parallel mode in the future, the structural layout of the module needs to be replanned, which is time-consuming and labor-intensive. With the popularization of new energy power systems, the regulation capacity of traditional power systems is limited, and it is difficult to respond quickly to highly dynamic changes in supply and demand. Therefore, it is necessary to design a series and parallel switching method between cluster-level battery racks to adapt to different load requirements.

[0003] Chinese patent number CN119382291A discloses a battery switching circuit and energy storage system, which relates to the field of battery management technology. In the battery switching circuit, when the main circuit switch drive circuit is turned on, the voltage at the output end of the main circuit switch drive circuit turns off the bypass switch drive circuit; when the bypass switch drive circuit is turned on, the voltage at the output end of the bypass switch drive circuit turns off the main circuit switch drive circuit, which can ensure that the bypass switch drive circuit and the main circuit switch drive circuit are not turned on at the same time, preventing the main circuit and the bypass circuit from being conductive at the same time, and avoiding short circuit of the battery unit. In the event of a faulty battery unit, ensure that the bypass circuit can be safely closed only after the main circuit of the faulty battery unit is effectively disconnected.

[0004] Chinese patent number CN110304000A discloses a lightweight method for a motor vehicle electronic control system. When the battery power of some batteries in the power module is lower than a predetermined first threshold, the automatic switching module transfers the output power to the second power supply. After the transfer is completed, the transferred power is adjusted to the second threshold. At this time, the first power supply enters the charging mode and the second power supply enters the power supply state. After the second power supply is lower than the first threshold, the automatic switching module transfers the output power to the third power supply, thereby realizing the recycling of the batteries in the power module.

[0005] The above are some battery or power switching methods in the prior art, but they are not applicable, cannot respond quickly according to dynamic changes in supply and demand, and cannot dynamically switch cluster-level connection methods to adapt to different load requirements. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for dynamic switching of parallel combinations of battery clusters, which can make a rapid response according to dynamic changes in supply and demand and realize dynamic switching of battery clusters.

[0007] The present invention provides a method for dynamically switching a battery cluster in parallel combination, comprising the following steps:

[0008] S1: Obtain the total number N of battery clusters. The number of battery clusters required for n different battery stacks is sorted in ascending order as D1 < D2 <... < Dn, where D1, D2,..., Dn are the number of battery clusters required for each different battery stack.

[0009] S2: Determine whether the number N of battery clusters is an integer multiple of the number of battery clusters required for each different battery stack. If so, proceed to the next step; otherwise, adjust the total number N of battery clusters or the number of battery clusters required for each different battery stack until the judgment condition is met and then proceed to the next step.

[0010] S3: Construct the basic grouping structure of the battery stacks. Based on the battery stack with the smallest required number of battery clusters, perform basic grouping on the total number N of battery clusters so that the number of battery clusters within the basic grouping is equal to the number of battery clusters within the battery stack with the smallest required number of battery clusters, and the battery clusters within the battery stack are connected in parallel.

[0011] S4: Optimize the grouping of the battery stacks according to the number of battery clusters required for other battery stacks in ascending order; re-group some of the basic groupings to form multiple extended groupings; make the number of battery clusters in multiple basic groupings, or the number of battery clusters in one or more basic groupings plus one or more extended groupings, equal to the number of battery clusters within the battery stack with the required number of battery clusters, and finally form the final grouping composed of the combination of the basic grouping and the extended grouping.

[0012] S5: Connect the basic grouping obtained in step S3 and the final grouping obtained in step S4 respectively to form each corresponding battery stack, and perform dynamic switching on the corresponding battery stacks according to the required number of battery clusters used.

[0013] Preferably, in step S3, the basic grouping of the total number N of battery clusters includes the following steps:

[0014] Evenly divide the smallest value D1 among the number of battery clusters required for different battery stacks into battery stacks to obtain the basic battery stack groupings B(D1, 1, 0), B(D1, 2, 0),..., where Each group of battery stacks contains D1 battery clusters, and the battery clusters within the battery stack are connected in parallel.

[0015] Preferably, step S4 specifically includes the following steps:

[0016] When the number of battery clusters required for the battery stack is Di, when That is, group the total number of battery clusters according to the number of battery clusters D1. The cumulative battery cluster data from the 1st to the dth battery stack is equal to Di, that is, the basic groupings from the 1st to the dth can be connected in parallel to form the first battery stack when the number of battery clusters is Di.

[0017] That is, the basic groups from d+1 to e can be connected in parallel to form a battery stack with a battery cluster number of Di; Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

[0018] Preferably, the step S4 specifically includes the following steps:

[0019] When the number of battery clusters required for the battery stack is Di, That is, the total number of battery clusters is grouped according to the number of battery clusters D1. The accumulated battery cluster data from the 1st to the dth battery stack is greater than Di. At this time, B(D1,d,0) is regrouped into two extended groups, B(D1,d,1) and B(D1,d,2), so that That is, the basic groups from the 1st to the d-1th plus the extended group of the dth basic group can be connected in parallel to form the first battery stack when the number of battery clusters is Di;

[0020] when or

[0021] , that is, the extended grouping of the dth basic grouping plus the d+1th to ethth battery stack basic groupings; or the extended grouping of the dth basic grouping plus the d+1th to e-1th basic groups, plus the extended grouping of the eth basic grouping, can be connected in parallel to form the next battery stack when the number of battery clusters is Di; proceed to the Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

[0022] Preferably, according to the basic grouping obtained in step S3, the positive and negative electrodes of each battery cluster in each basic group are connected to the controllable switch and then connected to the total positive and negative terminals of the battery stack of battery clusters D1 in number.

[0023] Preferably, according to the final grouping obtained in step S4, that is, the combination of the basic grouping and the extended grouping, according to the battery cluster quantity requirement of the battery stack with the battery cluster quantity Di, the basic grouping and the extended grouping are combined in sequence according to the final grouping, so that the positive and negative poles of each battery cluster are connected to the controllable switch and then connected to the total positive and negative ends of the battery stack with the battery cluster quantity Di.

[0024] The present invention has the following technical effects:

[0025] By analyzing and processing the number of battery clusters to adapt to different battery stacks through this method, analyzing according to the power supply and demand situation, formulating multiple sets of dynamic battery cluster switching strategies, so as to ensure that when the power demand changes, the working state of the battery clusters can be quickly adjusted to achieve the optimal power supply, and thus can make a rapid response according to the dynamic supply and demand changes to realize the dynamic switching of the battery clusters. Description of the Drawings

[0026] Figure 1 Schematic diagram of the basic grouping structure of the battery stack of the present invention;

[0027] Figure 2 Schematic diagram of the basic grouping structure of the battery stack in the embodiment of the present invention;

[0028] Figure 3 Connection diagram of the battery cluster and the battery stack when D1 = 4 in the embodiment of the present invention;

[0029] Figure 4 Connection diagram of the battery cluster and the battery stack when D2 = 6 in the embodiment of the present invention;

[0030] Figure 5 Connection diagram of the battery cluster and the battery stack when D3 = 12 in the embodiment of the present invention. Detailed Embodiment

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be specifically described below with reference to the accompanying drawings.

[0032] A dynamic switching method for parallel combination of battery clusters includes the following steps:

[0033] S1: Obtain the total number N of battery clusters. The number of battery clusters required for different n battery stacks is sorted in ascending order as D1 < D2 <... < Dn, where D1, D2,..., Dn are the number of battery clusters required for each different battery stack; among them, the total number of battery clusters N = 12, there are 3 battery stacks, and the number of battery clusters required for each battery stack is 4, 6, and 12 respectively, that is, D1 = 4, D2 = 6, D3 = 12, and the number of battery clusters N is an integer multiple of the number of battery clusters required for each different battery stack.

[0034] S2: Judge whether the number of battery clusters N is an integer multiple of the number of battery clusters required for each different battery stack. If so, proceed to the next step; otherwise, adjust the total number of battery clusters N or adjust the number of battery clusters required for each different battery stack until the judgment condition is met and proceed to the next step;

[0035] Such as Figure 1As shown, S3: construct a basic grouping structure of a battery stack, based on the battery stack with the minimum number of required battery clusters, perform basic grouping on the total number of battery clusters N, so that the number of battery clusters in the basic grouping is equal to the number of battery clusters in the battery stack with the minimum number of required battery clusters, and the battery clusters in the battery stack are connected in parallel;

[0036] In step S3, the basic grouping of the total number of battery clusters N includes the following steps:

[0037] According to the minimum value D1 of the number of battery clusters required for different battery stacks, it is divided into battery stacks, and obtain the basic battery stack groups B(D1,1,0), B(D1,2,0), ..., in Each battery stack contains D1 battery clusters, and the battery clusters in the battery stack are connected in parallel.

[0038] According to the basic grouping obtained in step S3, the positive and negative electrodes of each battery cluster in each basic group are connected to the controllable switch and then connected to the total positive and negative ends of the battery stack of battery cluster number D1.

[0039] like Figure 2 As shown, based on the result of S2 being judged as yes, the 12 battery clusters are evenly divided into the minimum number D1=4. The battery stack basic groups B(4,1,0), B(4,2,0), and B(4,3,0) are obtained, wherein the battery stack includes 4 battery clusters, and the battery clusters in the battery stack are connected in parallel.

[0040] S4: Optimize the battery stack grouping from small to large according to the number of battery clusters required by other battery stacks; regroup some basic groups to form multiple extended groups; make the number of battery clusters in multiple basic groups, or the number of battery clusters in more than one basic group plus more than one extended group, equal to the number of battery clusters in the battery stack required, and finally form a final grouping of the combination of the basic group and the extended group;

[0041] When the number of battery clusters required for the battery stack is Di, That is, the total number of battery clusters is grouped according to the number of battery clusters D1, and the accumulated battery cluster data from the 1st to the dth battery stack is equal to Di, that is, the basic groups from the 1st to the dth can be connected in parallel to form the first battery stack when the number of battery clusters is Di;

[0042] That is, the basic groups from d+1 to e can be connected in parallel to form a battery stack with a battery cluster number of Di; Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

[0043] When the number of battery clusters required for the battery stack is Di, That is, the total number of battery clusters is grouped according to the number of battery clusters D1. The accumulated battery cluster data from the 1st to the dth battery stack is greater than Di. At this time, B(D1,d,0) is regrouped into two extended groups, B(D1,d,1) and B(D1,d,2), so that That is, the basic groups from the 1st to the d-1th plus the extended group of the dth basic group can be connected in parallel to form the first battery stack when the number of battery clusters is Di;

[0044] when or

[0045] , that is, the extended grouping of the dth basic grouping plus the d+1th to ethth battery stack basic groupings; or the extended grouping of the dth basic grouping plus the d+1th to e-1th basic groups, plus the extended grouping of the eth basic grouping, can be connected in parallel to form the next battery stack when the number of battery clusters is Di; proceed to the Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

[0046] According to the final grouping obtained in step S4, that is, the combination of the basic grouping and the extended grouping, according to the battery cluster quantity requirement of the battery stack with the battery cluster quantity Di, according to the final grouping, the basic grouping and the extended grouping are combined in sequence so that the positive and negative poles of each battery cluster are connected to the controllable switch and then connected to the total positive and negative ends of the battery stack with the battery cluster quantity Di.

[0047] Divide the 12 battery clusters into 4 equal parts according to the minimum number D1. The battery stack basic groups B(4,1,0), B(4,2,0), and B(4,3,0) are obtained, wherein the battery stack includes 4 battery clusters, and the battery clusters in the battery stack are connected in parallel.

[0048] When D2=6, That is, B(4,2,0) needs to be regrouped to form two extended groups, B(4,2,1) and B(4,2,2), B(4,1,0)+B(4,2,1)=4+2=6, B(4,2,2)+B(4,3,0)=2+4=6, which meets the requirement of D2=6.

[0049] When D3=12,

[0050] That is, four groups are finally formed: B(4,1,0), B(4,2,1), B(4,2,2), and B(4,3,0).

[0051] S5: Connect the basic grouping obtained in step S3 and the final grouping obtained in step S4 to form corresponding battery stacks, and dynamically switch the corresponding battery stacks according to the number of battery clusters required.

[0052] like Figure 3 As shown, when D1=4, we get B(4,1,0), B(4,2,0), and B(4,3,0), which are battery stack 1, battery stack 2, and battery stack 3, respectively.

[0053] like Figure 4 As shown, when D2=6, B(4,1,0) and B(4,2,1) are battery stack 4, and B(4,2,2) and B(4,3,0) are battery stack 5.

[0054] like Figure 5 As shown, when D3=12, B(4,1,0), B(4,2,0), and B(4,3,0) are obtained as battery stack 6.

[0055] When the number of battery clusters required is 4, close the switches connecting the positive and negative terminals of each battery cluster and the total positive and negative terminals of battery stack 1, battery stack 2, and battery stack 3.

[0056] When the number of battery clusters required is 6, the switches connecting the positive and negative terminals of each battery cluster and the total positive and negative terminals of battery stack 4 and battery stack 5 are closed.

[0057] When the number of battery clusters required is 12, the switches of the positive and negative terminals of each battery cluster and the total positive and negative terminals of the battery stack 6 are closed.

[0058] All battery clusters are managed according to the battery management system to monitor battery cluster information in real time.

[0059] When the demand changes from a smaller number of battery clusters to a larger number, the circuit can only be closed when the voltage difference between the battery clusters in the new battery stack is within a certain range.

[0060] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for dynamic switching of parallel combination of battery clusters, characterized in that: It includes the following steps: S1: Obtain the total number N of battery clusters. The number of battery clusters required for n different battery stacks is sorted in ascending order as D1 < D2 <... < Dn, where D1, D2,..., Dn are the number of battery clusters required for each different battery stack. S2: Determine whether the number N of battery clusters is an integer multiple of the number of battery clusters required for each different battery stack. If so, proceed to the next step; otherwise, adjust the total number N of battery clusters or the number of battery clusters required for each different battery stack until the judgment condition is met and then proceed to the next step. S3: Construct the basic grouping structure of the battery stacks. Based on the battery stack with the smallest number of required battery clusters, perform basic grouping on the total number N of battery clusters so that the number of battery clusters within the basic grouping is equal to the number of battery clusters within the battery stack with the smallest number of required battery clusters, and the battery clusters within the battery stack are connected in parallel. S4: Optimize the grouping of the battery stacks according to the number of battery clusters required for other battery stacks from small to large; re-group some of the basic groupings to form multiple extended groupings; make the number of battery clusters in multiple basic groupings, or the number of battery clusters in one or more basic groupings plus one or more extended groupings, equal to the number of battery clusters within the battery stack with the number of required battery clusters, and finally form the final grouping combining the basic groupings and the extended groupings. S5: Connect the basic grouping obtained in step S3 and the final grouping obtained in step S4 respectively to form each corresponding battery stack, and perform dynamic switching on the corresponding battery stack according to the number of required battery clusters.

2. The method for dynamic switching of battery clusters in parallel according to claim 1, characterized in that: In step S3, the basic grouping of the total number N of battery clusters includes the following steps: According to the minimum value D1 of the number of battery clusters required for different battery stacks, it is divided into Battery stacks, get the basic grouping of battery stacks in Each battery stack contains D1 battery clusters, and the battery clusters in the battery stack are connected in parallel.

3. The method for dynamic switching of battery clusters in parallel according to claim 1, characterized in that: Step S4 specifically includes the following steps: When the number of battery clusters required for the battery stack is Di, That is, the total number of battery clusters is grouped according to the number of battery clusters D1, and the accumulated battery cluster data from the 1st to the dth battery stack is equal to Di, that is, the basic groups from the 1st to the dth can be connected in parallel to form the first battery stack when the number of battery clusters is Di; That is, the basic groups from d+1 to e can be connected in parallel to form a battery stack with a battery cluster number of Di; Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

4. The method for dynamic switching of battery clusters in parallel according to claim 1, characterized in that: Step S4 specifically includes the following steps: When the number of battery clusters required for the battery stack is Di, That is, the total number of battery clusters is grouped according to the number of battery clusters D1. The accumulated battery cluster data from the 1st to the dth battery stack is greater than Di. At this time, B(D1,d,0) is regrouped into two extended groups, B(D1,d,1) and B(D1,d,2), so that The basic grouping plus the extended grouping of the dth basic grouping can be connected in parallel to form the first battery stack when the number of battery clusters is Di; when or That is, the extended grouping of the dth basic grouping plus the d+1th to eth battery stack basic groupings; or the extended grouping of the dth basic grouping plus the d+1th to e-1th basic groups, plus the extended grouping of the eth basic grouping, can be connected in parallel to form the next battery stack when the number of battery clusters is Di; and so on. Basic grouping; where d is less than or equal to n, and e is less than or equal to n.

5. The method for dynamic switching of battery clusters in parallel according to claim 1, characterized in that: Based on the basic grouping obtained in step S3, connect the positive and negative poles of each battery cluster within each basic grouping to the total positive and negative terminals of the battery stack with the number of battery clusters D1 after connecting controllable switches.

6. The method for dynamic switching of battery clusters in parallel according to claim 1, characterized in that: Based on the final grouping obtained in step S4, that is, the combination of the basic grouping and the extended grouping, according to the requirement of the number of battery clusters of the battery stack with the number of battery clusters Di, combine the basic grouping and the extended grouping in order according to the final grouping, and connect the positive and negative poles of each of its battery clusters to the total positive and negative terminals of the battery stack with the number of battery clusters Di after connecting controllable switches.

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