CN113437441A - Battery core combination method of hybrid battery module and hybrid battery module - Google Patents

Battery core combination method of hybrid battery module and hybrid battery module Download PDF

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CN113437441A
CN113437441A CN202110667563.6A CN202110667563A CN113437441A CN 113437441 A CN113437441 A CN 113437441A CN 202110667563 A CN202110667563 A CN 202110667563A CN 113437441 A CN113437441 A CN 113437441A
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cell
cells
series
iron phosphate
lithium iron
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李东江
李俭
盛杰
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Svolt Energy Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M12/00—Hybrid cells; Manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention relates to the field of power batteries, and provides a battery core combination method of a hybrid battery module and the hybrid battery module. The hybrid battery module comprises a lithium iron phosphate battery core and a nickel-cobalt-manganese battery core, and the battery core combination method of the hybrid battery module comprises the following steps: combining a lithium iron phosphate battery cell and a nickel-cobalt-manganese battery cell in a mode of first connecting in series and then connecting in parallel; or the lithium iron phosphate battery cell and the nickel-cobalt-manganese battery cell are combined in a mode of firstly connecting in parallel and then connecting in series. According to the cell combination method of the hybrid battery module, the lithium iron phosphate cell and the nickel-cobalt-manganese cell are connected in series and in parallel, so that the overall energy density of the battery module is improved, the low-temperature performance of the battery module is improved, the thermal spread of the nickel-cobalt-manganese cell after thermal runaway can be effectively prevented, the safety performance of the whole module is improved, and the difficulty of thermal management design is reduced.

Description

Battery core combination method of hybrid battery module and hybrid battery module
Technical Field
The invention relates to the field of power batteries, in particular to a battery core combination method of a hybrid battery module and the hybrid battery module.
Background
The existing power battery module is generally formed by combining Lithium Iron Phosphate (LFP for short) (i.e. pure LFP module), and the disadvantages of this battery module are: the energy density is low, the requirement of high endurance of a user cannot be met, and the estimation of SOC, SOH and the like is inaccurate, so that the battery management system cannot effectively play a role in management, and the safety is low. Still another battery module is formed by the combination of nickel cobalt manganese acid lithium cell (including three kinds of materials nickel (Ni), cobalt (Co), manganese (Mn), abbreviate NMC electricity core for short), and this kind of battery module's shortcoming is: complicated heat diffusion prevention designs need to be introduced, so that the mass of the module and the battery pack is increased, the mass energy density of the battery pack is reduced, and the cost of the module and the battery pack is increased. At present, a battery module with higher safety and without adding a complicated thermal runaway prevention design is needed.
Disclosure of Invention
The invention aims to provide a battery core combination method of a hybrid battery module and the hybrid battery module, so as to solve the problems.
In order to achieve the above object, an aspect of the present invention provides a cell combination method of a hybrid battery module, where the hybrid battery module includes a lithium iron phosphate cell and a nickel cobalt manganese cell, the method including:
combining a lithium iron phosphate battery cell and a nickel-cobalt-manganese battery cell in a mode of first connecting in series and then connecting in parallel; or
And combining the lithium iron phosphate battery cell and the nickel-cobalt-manganese battery cell in a mode of firstly connecting in parallel and then connecting in series.
Further, with lithium iron phosphate electric core and nickel cobalt manganese electricity core in order to establish ties earlier then parallelly connected mode combination, include: forming a plurality of series units by using lithium iron phosphate cells and nickel cobalt manganese cells, wherein each series unit comprises at least one first subunit formed by connecting the lithium iron phosphate cells in series and at least one second subunit formed by connecting the nickel cobalt manganese cells in series; a plurality of series units are combined in a parallel connection.
Further, the first sub-unit comprises at least one lithium iron phosphate cell, the second sub-unit comprises at least one nickel cobalt manganese cell, the lithium iron phosphate cell of the first sub-unit and the nickel cobalt manganese cell of the second sub-unit are arranged at intervals.
Further, the number of lithium iron phosphate cells in the first subunit and the number of nickel cobalt manganese cells in the second subunit satisfy the following relationship:
Figure BDA0003117950200000021
or
Figure BDA0003117950200000022
Wherein n isLFPRepresents the number of lithium iron phosphate cells in the first subunit, nNMCRepresents the number of nickel cobalt manganese cells in the second subunit, nNMxRepresents the number of cobalt-free cells in the second subunit.
Further, the number of the lithium iron phosphate cells in each series unit is the same, and the number of the nickel-cobalt-manganese cells in each series unit is the same.
Further, with the combination of the lithium iron phosphate electricity core and nickel cobalt manganese electricity core in order to connect in parallel earlier the mode of establishing ties afterwards, include: forming a plurality of parallel units by using lithium iron phosphate cells and nickel cobalt manganese cells, wherein at least one parallel unit in the plurality of parallel units is formed by connecting the lithium iron phosphate cells in parallel, and at least one parallel unit is formed by connecting the nickel cobalt manganese cells in parallel; combining the plurality of parallel units in a series connection.
Further, the plurality of parallel units are arranged in an array.
Further, the number of lithium iron phosphate cells in each row of cells arranged in an array is the same, and the number of nickel-cobalt-manganese cells in each row of cells is the same.
Further, each row of cells arranged in an array includes at least one lithium iron phosphate cell, or each row of cells includes at least one nickel-cobalt-manganese cell.
Further, the method further comprises: a current control unit is connected in series in each series unit.
Further, the method further comprises: a current control unit is connected in series in each parallel unit.
Further, the capacity of the hybrid battery module satisfies the following conditions:
in NLFP>NNMCWhen the temperature of the water is higher than the set temperature,
Figure BDA0003117950200000031
in NLFP≤NNMCWhen the temperature of the water is higher than the set temperature,
Figure BDA0003117950200000032
wherein N isLFPDenotes the total number of lithium iron phosphate cells, N, of all the cells in seriesNMCRepresents the total number of nickel cobalt manganese cells of all string units,
Figure BDA0003117950200000033
represents the nominal capacity of a single lithium iron phosphate cell,
Figure BDA0003117950200000034
represents the nominal capacity, f, of a single nickel-cobalt-manganese cellLFP(t) represents the decay function of the capacity of the lithium iron phosphate core, fNMC(t) represents a decay function of the capacity of a nickel-cobalt-manganese cell.
Further, the initial SOC of the hybrid battery module satisfies the following condition:
Figure BDA0003117950200000035
or
Figure BDA0003117950200000036
Wherein the content of the first and second substances,
Figure BDA0003117950200000037
denotes the nominal capacity, x, of a single lithium iron phosphate cell0Represents the SOC of a single lithium iron phosphate cell,
Figure BDA0003117950200000038
represents the nominal capacity, y, of a single nickel-cobalt-manganese cell0Represents the SOC of a single nickel cobalt manganese cell.
Further, the nickel-cobalt-manganese cell can be replaced by a cobalt-free cell.
The invention also provides a hybrid battery module which is manufactured by adopting the battery core combination method of the hybrid battery module.
According to the cell combination method of the hybrid battery module, the lithium iron phosphate cell and the nickel-cobalt-manganese cell (or cobalt-free cell) are connected in series and in parallel, and the voltage curve of the lithium iron phosphate module is modified, so that the SOC and SOH of the battery module are calculated more accurately, and the management of a battery management system is facilitated; through with lithium iron phosphate electric core and nickel cobalt manganese electricity core (or cobalt-free electric core) series-parallel connection, promote the holistic energy density of battery module, promote the low temperature performance of battery module. Because the lithium iron phosphate core is difficult for the explosion on fire, with lithium iron phosphate core and nickel cobalt manganese electricity core series-parallel connection, can effectively the thermal stretch after nickel cobalt manganese electricity core thermal runaway, promote the security performance of whole module, reduced the degree of difficulty of thermal management design simultaneously. And, the cost of lithium iron phosphate core is less than nickel cobalt manganese electricity core, and the unit watt-hour cost of mixing the module is less than the unit watt-hour cost by pure nickel cobalt manganese module.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic diagram of the appearance of a square cell;
FIG. 2 is a schematic diagram of a serial-first and parallel-second combination according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a serial-first parallel combination mode (LFP cell and NMC cell are connected in series at intervals) according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a parallel-to-serial combination (parallel units are connected in series in a large-area-to-large-area manner) according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a parallel-to-serial combination (parallel units are connected in series in a side-by-side relationship) according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a series-then-parallel combination current control unit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a current control unit according to a parallel-serial combination method according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
A hybrid module composed of a lithium iron phosphate (hereinafter, LFP) cell and a nickel-cobalt-manganese (hereinafter, NMC) cell or a cobalt-free cell (hereinafter, NMx cell) has significant advantages over a pure LFP module and a pure NMC module. Mix the module and compare with pure LFP module, calculate more accurately such as SOC, SOH of mixing the module, realize BMS's effective management more easily, the energy density and the power density of mixing the cluster module are higher moreover, can provide more excellent driving experience. Compared with a pure NMC (or NMx) module, the hybrid module has higher safety, does not need to add a complex thermal runaway prevention design, and has lower cost per watt-hour. The hybrid modules are typically arranged in parallel or in multiple parallel strings.
The embodiment of the invention provides a battery cell combination method of a hybrid battery module, wherein the hybrid battery module comprises an LFP battery cell and an NMC battery cell, and the method comprises the following steps: combining an LFP (linear frequency modulation) battery cell and an NMC (non-linear frequency modulation) battery cell in a mode of first connecting in series and then connecting in parallel; or the LFP cell and the NMC cell are combined in a mode of first being connected in parallel and then being connected in series.
In one embodiment, the LFP cell and the NMC cell are combined in series and then in parallel. Specifically, the LFP battery cell and the NMC battery cell form a plurality of series units, each of which includes at least one first subunit formed by connecting the LFP battery cell in series and at least one second subunit formed by connecting the NMC battery cell in series, and then the plurality of series units are combined into the hybrid battery module in a parallel connection manner. The first sub-unit formed by connecting LFP cells in series comprises at least one LFP cell, the second sub-unit formed by connecting NMC cells in series comprises at least one NMC cell, and the LFP cells of the first sub-unit and the NMC cells of the second sub-unit are arranged at intervals.
FIG. 2 is a schematic diagram of a serial-first and parallel-second combination according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a serial-first parallel combination mode (LFP cell and NMC cell are connected in series at intervals) according to an embodiment of the present invention.
FIG. 2 shows a multi-string two-parallel module consisting of an LFP cell and an NMC cell which are connected in series and then connected in parallel, BiBeing a basic series unit containing any number of LFP or NMC cells, S1、S2Is formed by BiA series unit formed by series connection. S1And S2And obtaining a plurality of series and two parallel modules after parallel connection. In addition, the series unit SiThe number M is more than or equal to 1. For example, when BiOnly one cell is included, and when the LFP cell and the NMC cell are arranged at intervals, the configuration shown in fig. 3 is obtained. In FIG. 3, C1Denotes LFP cell, C2Denotes an NMC cell, or C2Denotes LFP cell, C1The NMC cell is indicated.
In this embodiment, the LFP cell and the NMC cell are both square. Fig. 1 is a schematic diagram of the shape of a square battery cell. Referring to fig. 1, the LFP cell and the NMC cell each include a top surface S1, a bottom surface S4, two large surfaces S3 (with the largest area), and two side surfaces S2. In the case that the large faces S3 of the cells are connected in series, which is shown in fig. 2 and fig. 3, different cells may be connected in series through the side faces S2.
In a preferred embodiment, the number of LFP cells in the first subunit consisting of LFP cell series connections and the number of NMC cells in the second subunit consisting of NMC cell series connections satisfy the following relationship:
Figure BDA0003117950200000061
or
Figure BDA0003117950200000062
Wherein n isLFPRepresenting the number of LFP cells in the first subunit, nNMCRepresents the number of NMC cells in the second subunit, nNMxRepresents the number of NMx cells in the second subunit.
For example, the number of LFP cells in the first subunit is 7, and the number of NMC cells in the second subunit is 6; alternatively, the number of LFP cells in the first subunit is 14, and the number of NMC cells in the second subunit is 12.
In another embodiment, the NMC cell described above can be replaced with an NMx cell (cobalt-free cell).
In another embodiment, the LFP cell and the NMC cell are combined in parallel and then in series. Specifically, the LFP cell and the NMC cell form a plurality of parallel units, at least one of the parallel units is formed by connecting the LFP cell in parallel, and at least one of the parallel units is formed by connecting the NMC cell in parallel. Then, a plurality of parallel units are combined into a hybrid battery module in a series connection manner, wherein the plurality of parallel units are arranged in an array. The number of LFP cells in each row of cells arranged in an array is the same, and the number of NMC cells in each row of cells is the same. Each row of cells arranged in an array includes at least one LFP cell, or each row of cells includes at least one NMC cell.
FIG. 4 is a schematic diagram of a parallel-to-serial combination (parallel units are connected in series in a large-area-to-large-area manner) according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a parallel-to-serial combination (parallel units are connected in series in a side-by-side manner) according to an embodiment of the present invention.
Referring to fig. 4 and 5, the LFP cells and the NMC cells are arranged in a parallel-first and series-second matrix. Wherein, Pi,jThe subscript i, j represents the ith row and jth parallel unit, i is more than or equal to 1, and j is more than or equal to 1. Parallel unit Pi,jThe battery cell can be formed by connecting pure LFP battery cells in parallel, or can be formed by connecting pure NMC or NMx battery cells with monotonously changing voltage in parallel. Pi,jThe number of cells in LFP or NMC (NMx) contained in the electrolyte is more than or equal to 1. Parallel unit Pi,jTwo connection modes are provided, wherein one connection mode is as shown in figure 4, and the large surfaces of the parallel units are oppositely connected in series; alternatively, as shown in FIG. 5, a parallel unit Pi,jThe side surfaces are oppositely connected in series. Thus, the LFP cells and nmc (nmx) cells may be in any position in the matrix.
In another embodiment, the NMC cell described above may be replaced with an NMx cell.
In order to maximize the space utilization in the entire battery pack, when the LFP cell and the NMC (or NMx) cell are combined in series and parallel, the sizes of the cells need to be matched as a whole. For the series-first and parallel-second mode, each series unit S needs to be ensurediThe whole being of substantially equal size, i.e. the series units SiThe number of middle LFP electric cores is equal, and each series unit SiThe number of medium NMC (or NMx) cells is equal. Meanwhile, when the LFP cell and the NMC (or NMx) cell are oppositely connected in series by a large surface, the large surfaces are completely equal; when the LFP cell and the NMC (or NMx) cell are connected in series with their sides facing each other, the sides are exactly equal. For the parallel-series mode, it is necessary to ensure that the overall size of each row of cells is completely equal, that is, the number of LFP cells in each row is equal, and the number of NMC (or NMx) cells in each row is equal. Meanwhile, when the LFP cell and the NMC (or NMx) cell are usedWhen the large faces are connected in series oppositely, the large faces are completely equal.
The number of LFP cells and NMC (or NMx) cells in the hybrid module may be matched in proportion. For the series-parallel mode, the number of LFP cells in each series unit is the same, the number of NMC cells in each series unit is the same, and the voltages of each series unit are equal. I.e. each series unit SiThe number of middle LFP electric cores is equal and each series unit SiThe number of medium NMC (or NMx) battery cores is equal, and each series unit S is ensurediAre equal. The specific number of LFP cells and NMC (or NMx) cells depends on the design purpose of the hybrid module. For example, when the design goal of the hybrid module is to improve the energy density of the LFP module, to improve the SOC calculation accuracy, to improve the management strategy of the BMS, each series unit SiAt least one NMC (or NMx) cell; when the design objective of the hybrid module is to improve the safety performance of the NMC (or NMx) module, each series unit SiThe battery contains at least one LFP cell for isolating the NMC (or NMx) cell and inhibiting the rapid spread and diffusion of thermal runaway. One special case of the series-parallel mode is that the units S are connected in series1Composed of LFP cells or NMC (or NMx) cells only, and connected in series with a unit S2Consisting of NMC (or NMx) cells or LFP cells only, but S1And S2The number of the middle cells is different. Suppose S1Formed by LFP in series, S2Formed by NMC (or NMx) in series, then S1Number of middle LFP and S2The number of medium NMC (or NMx) cells should satisfy the following relationship:
Figure BDA0003117950200000081
or
Figure BDA0003117950200000091
Wherein n isLFPRepresenting the number of LFP cells in the first subunit, nNMCRepresents the number of NMC cells in the second subunit, nNMxRepresents the number of NMx cells in the second subunit.
For the parallel-first and serial-later mode, the number of LFP electric cores in each row is equal; the number of NMC or NMx cells in each row is equal. The specific number of LFP cells and NMC or NMx cells depends on the design purpose of the hybrid serial-parallel module. For example, when the design of the mixed serial-parallel module aims at improving the energy density of the LFP module, increasing the SOC calculation accuracy, and improving the management strategy of the BMS, the parallel unit P having at least one NMC or NMx cell in each rowi,j(ii) a When the mixed series-parallel module is designed to improve the safety performance of the NMC or NMx module, each row of the structure at least comprises one LFP cell parallel unit Pi,jUsed for isolating NMC or NMx cells and inhibiting the rapid propagation and diffusion of thermal runaway
From the aspect of capacity matching, the capacity of the hybrid battery module satisfies the following conditions:
in NLFP>NNMCWhen the temperature of the water is higher than the set temperature,
Figure BDA0003117950200000092
in NLFP≤NNMCWhen the temperature of the water is higher than the set temperature,
Figure BDA0003117950200000093
wherein N isLFPRepresenting the total number of LFP cells, N, of all series-connected cellsNMCRepresents the total number of NMC cells of all string units,
Figure BDA0003117950200000094
represents the nominal capacity of a single LFP cell,
Figure BDA0003117950200000095
indicating the nominal capacity, f, of a single NMC cellLFP(t) represents the decay function of LFP cell capacity, fNMC(t) represents a decay function of NMC cell capacity. Wherein the content of the first and second substances,
Figure BDA0003117950200000096
from the initial SOC matching, the initial SOC of the hybrid battery module satisfies the following conditions:
Figure BDA0003117950200000097
or
Figure BDA0003117950200000101
Namely, it is
Figure BDA0003117950200000102
Wherein the content of the first and second substances,
Figure BDA0003117950200000103
representing the nominal capacity, x, of a single LFP cell0Represents the SOC of a single LFP cell,
Figure BDA0003117950200000104
indicating the nominal capacity, y, of a single NMC cell0Represents the SOC of a single NMC cell.
In order to realize artificial control of the current passing through each battery cell, the embodiment of the invention is provided with the current control unit in the hybrid battery module.
Fig. 6 is a schematic diagram of a current control unit in a serial-to-parallel combination manner according to an embodiment of the present invention. Referring to fig. 6, for the combination of series-first and parallel-second, a current control unit is connected in series in each series unit. The current control unit is connected in series to the series basic unit S, and the current control unit can control the current of each series circuit, control the current passing through each battery cell in real time and realize the active control of the state of each battery cell.
Fig. 7 is a schematic diagram of a current control unit according to a parallel-serial combination method according to an embodiment of the present invention. Referring to fig. 7, for the parallel-first-to-series combination, a current control unit is connected in series in each parallel unit. The current control unit is connected in series to the basic parallel unit P, and the current control unit can control the current of each parallel circuit, so that the aging rate, the temperature distribution and the like of the parallel battery cells are effectively regulated and controlled, and the consistency of the module is improved.
According to the embodiment of the invention, the LFP battery cell and the NMC (or NMx) battery cell are connected in series and in parallel, and the voltage curve of the LFP module is modified, so that the SOC and SOH of the battery module are calculated more accurately, and the management of a battery management system is facilitated; through with LFP electric core and NMC (or NMx) electric core series-parallel connection, promote the holistic energy density of battery module, promote the low temperature performance of battery module. Because the LFP electric core is difficult to catch fire and explode, the LFP electric core is connected with the NMC (or NMx) electric core in series and parallel, the thermal spread after the thermal runaway of the NMC (or NMx) electric core can be effectively blocked, the safety performance of the whole module is improved, and the difficulty of the thermal management design is reduced. And, the cost of LFP electric core is less than NMC electric core, and the unit watt-hour cost of mixing the module is less than by the unit watt-hour cost of pure NMC module.
The embodiment of the invention also provides a hybrid battery module which is manufactured by adopting the battery core combination method of the hybrid battery module.
The embodiment of the invention also provides a battery pack which comprises the hybrid battery module.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.

Claims (15)

1. A cell combination method of a hybrid battery module, the hybrid battery module comprising a lithium iron phosphate cell and a nickel cobalt manganese cell, the method comprising:
combining a lithium iron phosphate battery cell and a nickel-cobalt-manganese battery cell in a mode of first connecting in series and then connecting in parallel; or
And combining the lithium iron phosphate battery cell and the nickel-cobalt-manganese battery cell in a mode of firstly connecting in parallel and then connecting in series.
2. The method for combining the battery cells of the hybrid battery module according to claim 1, wherein the combining the lithium iron phosphate battery cell and the nickel-cobalt-manganese battery cell in series connection and then in parallel connection comprises:
forming a plurality of series units by using lithium iron phosphate cells and nickel cobalt manganese cells, wherein each series unit comprises at least one first subunit formed by connecting the lithium iron phosphate cells in series and at least one second subunit formed by connecting the nickel cobalt manganese cells in series;
a plurality of series units are combined in a parallel connection.
3. The method for assembling battery cells of a hybrid battery module according to claim 2, wherein the first sub-unit comprises at least one lithium iron phosphate cell, the second sub-unit comprises at least one nickel cobalt manganese cell, and the lithium iron phosphate cell of the first sub-unit and the nickel cobalt manganese cell of the second sub-unit are arranged at intervals.
4. The cell combination method of the hybrid battery module according to claim 3, wherein the number of lithium iron phosphate cells in the first subunit and the number of nickel cobalt manganese cells in the second subunit satisfy the following relationship:
Figure FDA0003117950190000011
or
Figure FDA0003117950190000012
Wherein n isLFPRepresents the number of lithium iron phosphate cells in the first subunit, nNMCRepresents the number of nickel cobalt manganese cells in the second subunit, nNMxRepresents the number of cobalt-free cells in the second subunit.
5. The method for assembling battery cells of a hybrid battery module according to claim 2, wherein the number of lithium iron phosphate cells in each series unit is the same, and the number of nickel cobalt manganese cells in each series unit is the same.
6. The method for combining the battery cells of the hybrid battery module according to claim 1, wherein the combining the lithium iron phosphate battery cell and the nickel-cobalt-manganese battery cell in a series-parallel manner comprises:
forming a plurality of parallel units by using lithium iron phosphate cells and nickel cobalt manganese cells, wherein at least one parallel unit in the plurality of parallel units is formed by connecting the lithium iron phosphate cells in parallel, and at least one parallel unit is formed by connecting the nickel cobalt manganese cells in parallel;
combining the plurality of parallel units in a series connection.
7. The method for assembling the battery cells of the hybrid battery module of claim 6, wherein the plurality of parallel units are arranged in an array.
8. The method of claim 7, wherein the number of lithium iron phosphate cells in each row of cells arranged in an array is the same, and the number of nickel-cobalt-manganese cells in each row of cells is the same.
9. The method for assembling the battery cells of the hybrid battery module according to claim 7, wherein each row of the battery cells arranged in an array includes at least one lithium iron phosphate battery cell, or each row of the battery cells includes at least one nickel-cobalt-manganese battery cell.
10. The method for assembling the battery cell of the hybrid battery module according to claim 2, further comprising:
a current control unit is connected in series in each series unit.
11. The method for assembling the battery cell of the hybrid battery module according to claim 6, further comprising:
a current control unit is connected in series in each parallel unit.
12. The method for assembling the battery cell of the hybrid battery module according to claim 2 or 6, wherein the capacity of the hybrid battery module satisfies the following conditions:
in NLFP＞NNMCWhen the temperature of the water is higher than the set temperature,
Figure FDA0003117950190000031
in NLFP≤NNMCWhen the temperature of the water is higher than the set temperature,
Figure FDA0003117950190000032
wherein N isLFPDenotes the total number of lithium iron phosphate cells, N, of all the cells in seriesNMCRepresents the total number of nickel cobalt manganese cells of all string units,
Figure FDA0003117950190000033
represents the nominal capacity of a single lithium iron phosphate cell,
Figure FDA0003117950190000034
represents the nominal capacity, f, of a single nickel-cobalt-manganese cellLFP(t) represents a lithium iron phosphate cellDecay function of capacity, fNMC(t) represents a decay function of the capacity of a nickel-cobalt-manganese cell.
13. The method for assembling the battery cells of the hybrid battery module according to claim 2 or 6, wherein the initial SOC of the hybrid battery module satisfies the following conditions:
Figure FDA0003117950190000035
or
Figure FDA0003117950190000036
Wherein the content of the first and second substances,
Figure FDA0003117950190000037
denotes the nominal capacity, x, of a single lithium iron phosphate cell0Represents the SOC of a single lithium iron phosphate cell,
Figure FDA0003117950190000038
represents the nominal capacity, y, of a single nickel-cobalt-manganese cell0Represents the SOC of a single nickel cobalt manganese cell.
14. The method for assembling the battery cells of the hybrid battery module set forth in claim 1, wherein the nickel-cobalt-manganese battery cells can be replaced by cobalt-free battery cells.
15. A hybrid battery module manufactured by the method for assembling the battery cell of the hybrid battery module according to any one of claims 1 to 11.
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