Hybrid system battery cell module structure

Abstract

The invention relates to a mixed system battery cell module structure which at least comprises a charging system, a first system battery cell and a second system battery cell which are connected in series, the first system battery cell at least comprises a first single battery cell, a second single battery cell and a third single battery cell which are sequentially connected in series; the second system battery cell at least comprises a fourth single battery cell, and the fourth single battery cell is connected in series with the charging system, the first single battery cell, the second single battery cell and the third single battery cell; the first system battery cell and the second system battery cell are battery cells of different systems. The battery cells of different systems are combined and matched, so that the charging voltage of each single battery cell of the mixed system battery cell module structure during charging is lower than the maximum charging voltage of the battery cell of the corresponding system, and the charging voltage of the obtained mixed system battery cell module structure can be well matched with a charging system of a lead-acid battery; and a BMS can be omitted, and the cost of changing lead into lithium is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a hybrid system battery cell module structure. Background Art

[0002] With the development of science and technology, power batteries as an energy device have attracted more and more attention and have been widely used in mobile phones, electric vehicles, power tools, home energy storage and other fields.

[0003] Compared with lead-acid batteries, lithium batteries have better performance and environmental friendliness, and have great advantages in the conversion from lead to lithium. However, due to the difference between the charging voltage of lead-acid batteries and lithium batteries, the charging system usually needs to be replaced during the conversion from lead to lithium, and a BMS needs to be added to control the cell voltage, which greatly increases the cost of replacement and is difficult to meet the needs of practical applications. Summary of the invention

[0004] Based on this, the present invention provides a hybrid system battery module structure, which aims to solve the problems of difference in charging voltage between lead-acid batteries and lithium batteries, the need to replace the charging system when converting lead to lithium, the need to add a BMS, and high replacement cost.

[0005] To achieve the above-mentioned purpose, an embodiment of the present invention proposes the following technical solution: a hybrid system battery cell module structure, comprising at least a charging system, a first system battery cell and a second system battery cell connected in series; the first system battery cell comprises at least a first single cell, a second single cell and a third single cell connected in series in sequence; the second system battery cell comprises at least a fourth single cell, and the fourth single cell is connected in series with the charging system, the first single cell, the second single cell and the third single cell; the first system battery cell and the second system battery cell are batteries of different systems.

[0006] As a preferred embodiment, the charging system is one of a lead-acid battery charging system, a lithium battery charging system or a sodium battery charging system.

[0007] As a preferred embodiment, the first system battery cell is a lithium battery system battery cell or a sodium battery system battery cell; the second system battery cell is a lithium battery system battery cell or a sodium battery system battery cell.

[0008] As a preferred embodiment, the lithium battery system cell is one of a ternary lithium battery cell, a lithium iron phosphate battery cell or a lithium iron manganese phosphate battery cell.

[0009] As a preferred embodiment, the first battery cell, the second battery cell and the third battery cell all have the same structure.

[0010] As a preferred implementation, the charging voltage of the first battery cell, the charging voltage of the second battery cell, and the charging voltage of the third battery cell are all the same.

[0011] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, the sum of the charging voltage of the first single battery cell, the charging voltage of the second single battery cell, the charging voltage of the third single battery cell and the charging voltage of the fourth single battery cell is equal to the charging voltage of the charging system.

[0012] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, 90% of the first SOC voltage ≤ the charging voltage of the first single cell / the charging voltage of the second single cell / the charging voltage of the third single cell ≤ 100% of the first SOC voltage (maximum charging voltage); the first SOC voltage is the maximum charging voltage of the first single cell, the second single cell or the third single cell.

[0013] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, 90% of the second SOC voltage ≤ the charging voltage of the fourth single battery cell ≤ 100% of the second SOC voltage (maximum charging voltage); the second SOC voltage is the maximum charging voltage of the fourth single battery cell.

[0014] As a preferred embodiment, when 90% of the first SOC voltage ≤ the charging voltage of the first single cell / the charging voltage of the second single cell / the charging voltage of the third single cell ≤ 100% of the first SOC voltage, the capacity of the first system cell is equal to the capacity of the second system cell, and the first SOC voltage is equal to the second SOC voltage.

[0015] As a preferred embodiment, when 90% of the first SOC voltage ≤ the charging voltage of the first single cell / the charging voltage of the second single cell / the charging voltage of the third single cell ≤ 100% of the first SOC voltage, if the capacity of the first system cell - the capacity of the second system cell = ΔQ (i.e., the capacity of the first system cell is not equal to the capacity of the second system cell), then the initial capacity of the first system cell - the initial capacity of the second system cell = ΔQ, and when the hybrid system cell module structure is in a cycle state, the capacity attenuation rate of the first system cell is equal to the capacity attenuation rate of the second system cell. In this way, it can be ensured that the charging voltage of each single cell of the hybrid system cell module structure is always within the allowable charging voltage range in the subsequent cycle use.

[0016] Beneficial effects achieved by the present invention: By combining and matching cells of different systems, the present application can make the charging voltage of each single cell of the hybrid system cell module structure lower than the maximum charging voltage of the corresponding system cell during charging, so that the charging voltage of the obtained hybrid system cell module structure can be well adapted to the charging system of the lead-acid battery, and the BMS can be omitted, effectively reducing the cost of lead-to-lithium conversion. The structure of the present application can avoid the trouble of replacing the charging system in the lead-to-lithium conversion, which not only effectively improves the reusability of the original components, but also significantly improves the conversion efficiency of lead-to-lithium conversion, greatly reduces the cost of use, has higher practicality and economy, and can be produced and used as a general product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, 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 the structures shown in these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a hybrid system battery cell module structure according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of charging voltage of hybrid system battery cell module structure.

[0020] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] Specifically, Figure 1 to Figure 2 As shown, an embodiment of the present invention proposes the following technical solution: a hybrid system battery module structure, comprising at least a charging system 10, a first system battery 20 and a second system battery 30 connected in series; the first system battery 20 comprises at least a first single cell 21, a second single cell 22 and a third single cell 23 connected in series in sequence; the second system battery 30 comprises at least a fourth single cell 31, and the fourth single cell 31 is connected in series with the charging system 10, the first single cell 21, the second single cell 22 and the third single cell 23; the first system battery 20 and the second system battery 30 are batteries of different systems.

[0027] As a preferred embodiment, the charging system 10 is one of a lead-acid battery charging system, a lithium battery charging system or a sodium battery charging system. In this embodiment, the charging system 10 is a lead-acid battery charging system. In other embodiments, according to actual use needs, the charging system 10 can also be a lithium battery charging system or a sodium battery charging system.

[0028] As a preferred embodiment, the first system battery cell 20 is a lithium battery system battery cell or a sodium battery system battery cell; the second system battery cell 30 is a lithium battery system battery cell or a sodium battery system battery cell.

[0029] Specifically, in this embodiment, when the first battery cell 20 is a lithium battery cell, the second battery cell 30 is a sodium battery cell. It is understood that in another embodiment, when the first battery cell 20 is a sodium battery cell, the second battery cell 30 is a lithium battery cell.

[0030] In other embodiments, three different system cells may be provided according to actual use needs, such as the first system cell 20 may be provided as a lithium battery system cell, the second system cell 30 may be provided as a sodium battery system cell, and the third system cell may be provided as a lead-acid battery system cell.

[0031] As a preferred embodiment, the lithium battery system cell is one of a ternary lithium battery cell, a lithium iron phosphate battery cell or a lithium iron manganese phosphate battery cell. In this embodiment, the lithium battery system cell is a lithium iron phosphate battery cell. In other embodiments, according to the actual use needs, the lithium battery system cell can also be a ternary lithium battery cell or a lithium iron manganese phosphate battery cell.

[0032] As a preferred embodiment, the first battery cell 21, the second battery cell 22 and the third battery cell 23 all have the same structure, so as to facilitate the regulation of the charging voltage of each battery cell.

[0033] As a preferred embodiment, the charging voltage U1 of the first battery cell 21, the charging voltage U2 of the second battery cell 22, and the charging voltage U3 of the third battery cell 23 are all the same, so as to facilitate the regulation of the charging voltage of each battery cell.

[0034] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, the sum of the charging voltage U1 of the first single battery cell 21, the charging voltage U2 of the second single battery cell 22, the charging voltage U3 of the third single battery cell 23 and the charging voltage U4 of the fourth single battery cell 31 is equal to the charging voltage U of the charging system 10.

[0035] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, 90% of the first SOC voltage ≤ the charging voltage U1 of the first single battery cell 21 / the charging voltage U2 of the second single battery cell 22 / the charging voltage U3 of the third single battery cell 23 ≤ 100% of the first SOC voltage (maximum charging voltage); the first SOC (i.e., State of Charge, indicating the state when the single battery cell is fully charged) voltage is the maximum charging voltage of the first single battery cell 21, the second single battery cell 22 or the third single battery cell 23.

[0036] As a preferred embodiment, when the hybrid system battery module structure is in a charging state, 90% of the second SOC voltage ≤ the charging voltage U4 of the fourth single battery cell 31 ≤ 100% of the second SOC voltage (maximum charging voltage); the second SOC voltage is the maximum charging voltage of the fourth single battery cell 31.

[0037] As a preferred embodiment, when 90% of the first SOC voltage ≤ the charging voltage U1 of the first single cell 21 / the charging voltage U2 of the second single cell 22 / the charging voltage U3 of the third single cell 23 ≤ 100% of the first SOC voltage, the capacity of the first system cell 20 is equal to the capacity of the second system cell 30, and the first SOC voltage is equal to the second SOC voltage.

[0038] Since the charging voltage of each single cell is always less than the maximum charging voltage of each single cell, there is no need for BMS protection monitoring. Since the charging voltage range of different systems is different, that is, U4 is not equal to U1, U2 or U3, and the proportion of the number of cells in different systems is also different, the voltage of U1+U2+U3+U4 is adjustable, which can be adjusted to the charging voltage U of the lead-acid battery charging system, so that the hybrid system cell module structure can adapt to the lead-acid battery charging system, and can save the BMS management system, effectively reducing costs.

[0039] As a preferred embodiment, when 90% of the first SOC voltage ≤ the charging voltage U1 of the first single cell 21 / the charging voltage U2 of the second single cell 22 / the charging voltage U3 of the third single cell 23 ≤ 100% of the first SOC voltage, if the capacity of the first system cell 20 - the capacity of the second system cell 30 = ΔQ (i.e., the capacity of the first system cell 20 is not equal to the capacity of the second system cell 30), then the initial capacity of the first system cell 20 - the initial capacity of the second system cell 30 = ΔQ, and when the hybrid system cell module structure is in a cycle state, the capacity attenuation rate of the first system cell 20 is equal to the capacity attenuation rate of the second system cell 30. In this way, it can be ensured that the charging voltage of each single cell of the hybrid system cell module structure is always within the allowable charging voltage range in the subsequent cycle use.

[0040] By combining and matching batteries of different systems, the present application can make the charging voltage of each single battery cell of the hybrid system battery cell module structure lower than the maximum charging voltage of the corresponding system battery cell during charging, so that the charging voltage of the obtained hybrid system battery cell module structure can be well adapted to the charging system of the lead-acid battery, and the BMS can be omitted, effectively reducing the cost of lead-to-lithium conversion. Through the structure of the present application, the trouble of replacing the charging system in the lead-to-lithium conversion can be avoided, which not only effectively improves the reusability of the original components, but also significantly improves the conversion efficiency of lead-to-lithium conversion, greatly reduces the use cost, has higher practicality and economy, and can be produced and used as a general product.

[0041] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0042] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0043] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A hybrid system battery module structure, characterized in that: It at least includes a charging system, a first system battery cell and a second system battery cell connected in series; the first system battery cell at least includes a first single battery cell, a second single battery cell and a third single battery cell connected in series in sequence; the second system battery cell at least includes a fourth single battery cell, and the fourth single battery cell is connected in series with the charging system, the first single battery cell, the second single battery cell and the third single battery cell; the first system battery cell and the second system battery cell are batteries of different systems.

2. The hybrid system battery module structure according to claim 1, characterized in that: The charging system is one of a lead-acid battery charging system, a lithium battery charging system or a sodium battery charging system.

3. The hybrid system battery module structure according to claim 1, characterized in that: The first system cell is a lithium battery system cell or a sodium battery system cell; the second system cell is a lithium battery system cell or a sodium battery system cell.

4. The hybrid system battery module structure according to claim 3, characterized in that: The lithium battery system cell is one of a ternary lithium battery cell, a lithium iron phosphate battery cell or a lithium iron manganese phosphate battery cell.

5. The hybrid system battery module structure according to claim 1, characterized in that: The first single cell, the second single cell and the third single cell all have the same structure; The charging voltage of the first battery cell, the charging voltage of the second battery cell, and the charging voltage of the third battery cell are all the same.

6. The hybrid system battery module structure according to claim 1, characterized in that: When the hybrid system battery module structure is in a charging state, the sum of the charging voltage of the first single battery cell, the charging voltage of the second single battery cell, the charging voltage of the third single battery cell and the charging voltage of the fourth single battery cell is equal to the charging voltage of the charging system.

7. The hybrid system battery module structure according to claim 1, characterized in that: When the hybrid system battery module structure is in a charging state, 90% of the first SOC voltage ≤ the charging voltage of the first single battery cell / the charging voltage of the second single battery cell / the charging voltage of the third single battery cell ≤ 100% of the first SOC voltage; the first SOC voltage is the maximum charging voltage of the first single battery cell, the second single battery cell or the third single battery cell.

8. The hybrid system battery module structure according to claim 7, characterized in that: When the hybrid system battery module structure is in a charging state, 90% of the second SOC voltage ≤ the charging voltage of the fourth single battery cell ≤ 100% of the second SOC voltage; the second SOC voltage is the maximum charging voltage of the fourth single battery cell.

9. The hybrid system battery module structure according to claim 8, characterized in that: When 90% of the first SOC voltage ≤ the charging voltage of the first single cell / the charging voltage of the second single cell / the charging voltage of the third single cell ≤ 100% of the first SOC voltage, the capacity of the first system cell is equal to the capacity of the second system cell, and the first SOC voltage is equal to the second SOC voltage.

10. The hybrid system battery module structure according to claim 8, characterized in that: When 90% of the first SOC voltage ≤ the charging voltage of the first single cell / the charging voltage of the second single cell / the charging voltage of the third single cell ≤ 100% of the first SOC voltage, if the capacity of the first system cell - the capacity of the second system cell = ΔQ, then the initial capacity of the first system cell - the initial capacity of the second system cell = ΔQ, and when the hybrid system cell module structure is in a cycle state, the capacity attenuation rate of the first system cell is equal to the capacity attenuation rate of the second system cell.

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