CN214477773U

CN214477773U - High-capacity battery module with small-capacity battery cores in dual parallel connection

Info

Publication number: CN214477773U
Application number: CN202120912938.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuhan Weineng Battery Assets Co ltd
Current assignee: Wuhan Weineng Battery Assets Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-10-22
Anticipated expiration: 2031-04-29

Abstract

The utility model provides a dual parallelly connected high capacity battery module of low capacity electricity core. The high-capacity battery module comprises a primary parallel battery cell and a secondary parallel battery cell obtained by connecting a plurality of primary parallel battery cells in parallel; the first-level parallel battery cell comprises a plurality of small-capacity battery cells connected in parallel. By the arrangement, when the high-capacity battery module is retired, the secondary parallel battery core is split, and the secondary parallel battery core can be secondarily applied to the power supply field of the power battery with corresponding small-capacity requirement; and the primary parallel battery cell is further split, so that the secondary battery cell can be secondarily applied to the field of power supply of power batteries with correspondingly smaller capacity requirements. The concentric circles of the hollow-structure battery cell are connected in parallel, so that the internal resistance of the battery cell can be reduced, the heat dissipation effect is improved, and the spatial layout is more reasonable. The utility model discloses not only enlarged the echelon of low capacity electricity core and utilized the scene, still improved the capacity stability of battery, reduced the battery control degree of difficulty, fully excavated the value of utilization of battery.

Description

High-capacity battery module with small-capacity battery cores in dual parallel connection

Technical Field

The utility model relates to a battery technology field especially relates to a dual parallelly connected high capacity battery module of low capacity electricity core.

Background

Along with the gradual increase of the requirement of the new energy electric automobile on the endurance mileage, the requirement on the energy density of the battery is gradually increased, and in order to achieve higher energy density, the electric automobile needs to use a battery core with larger monomer capacity. Due to national regulations, when the chargeable and dischargeable capacity of the vehicle power battery is less than or equal to 80% of the initial capacity, the vehicle power battery needs to be retired. For the retired power battery, 80% of the residual chargeable and dischargeable capacity of the retired power battery still has great use value, and the retired power battery can be continuously used in other fields such as forklifts, low-speed electric vehicles, standby power supplies and the like which have low requirements on the chargeable and dischargeable capacity. However, the capacity, the volume and the weight of the battery cell monomer of the battery for the electric automobile are too large, and exceed the actual requirements of a forklift, a low-speed electric vehicle and a standby power supply, so that the gradient utilization scene is not many.

In view of the above, there is a need to design an improved high-capacity battery module with dual parallel small-capacity cells to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a dual parallelly connected high capacity battery module of low capacity electricity core. The utility model discloses parallelly connected the obtaining parallelly connected electric core of one-level with low capacity electricity core, parallelly connected the parallelly connected high capacity battery module that obtains dual parallelly connected with the parallelly connected electric core of one-level again, not only enlarged the echelon of low capacity electricity core and utilized the scene, still improved the capacity stability of battery, reduced the battery control degree of difficulty. Through the concentric circle type parallel connection of the hollow-structure battery cell, more tabs can be led out from the edges of the positive and negative current collectors, so that the internal resistance of the battery cell is reduced, the heat dissipation effect is improved, and the spatial layout is more reasonable.

In order to realize the purpose of the utility model, the utility model provides a high-capacity battery module with small-capacity battery cells in double parallel connection, which comprises a first-level parallel battery cell and a second-level parallel battery cell obtained by connecting a plurality of first-level parallel battery cells in parallel; the first-level parallel battery cell comprises a plurality of small-capacity battery cells connected in parallel.

As a further improvement of the present invention, each of the small-capacity cells is a cell having a hollow structure, and the cells having a hollow structure are arranged in concentric circles and then connected in parallel.

As a further improvement of the present invention, two adjacent hollow structures are provided between the cells having hollow structures.

As a further improvement, the outer diameter of the battery cell with a hollow structure is larger than the height thereof, the positive electrode tab and the negative electrode tab of the battery cell with a hollow structure are respectively arranged at the two ends of the battery cell with a hollow structure in the height direction.

As a further improvement of the present invention, each of the small-capacity battery cells includes a bare cell body, a positive electrode tab and a negative electrode tab connected to the bare cell body, and an encapsulation structure for encapsulating the bare cell body; one ends of the positive electrode lug and the negative electrode lug are connected with the naked electric core body, and the other ends of the positive electrode lug and the negative electrode lug are exposed outside the packaging structure; and tab glue layers are arranged at the connection parts of the positive electrode tab and the negative electrode tab with the packaging structure.

As a further improvement of the utility model, a plurality of link to each other through the anodal bridge of aluminium between the anodal utmost point ear of low capacity electricity core, link to each other through the anodal bridge of nickel between the negative pole utmost point ear, obtain the parallelly connected electric core of one-level.

As a further improvement, the packaging structure of the small-capacity battery cell is a cylindrical packaging structure, a soft-package packaging structure or a square packaging structure.

As the utility model discloses a further improvement, every the parallelly connected electric core of one-level is equipped with total positive pole utmost point ear and total negative pole utmost point ear, a plurality of link to each other through positive pole switching piece between the total positive pole utmost point ear of the parallelly connected electric core of one-level, link to each other through negative pole switching piece between the total negative pole utmost point ear, obtain the parallelly connected electric core of second grade.

In order to realize the above object, the utility model discloses still provide more than one the dual parallel high capacity battery module's of low capacity electricity core recycle method, include: the secondary parallel battery cell of the retired high-capacity battery module is split to obtain a plurality of groups of retired primary parallel battery cells, and the secondary of the retired primary parallel battery cells is applied to the power supply field of the power battery with corresponding small-capacity requirements according to the capacity of the retired primary parallel battery cells.

As the utility model discloses a further improvement, the one-level of a plurality of groups's retirement that obtains the split is parallelly connected electric core and is further split, obtains the low capacity electric core of a plurality of retirement, according to the capacity of the low capacity electric core of retirement, is applied to its power battery power supply field that corresponding less capacity required.

The utility model has the advantages that:

1. the utility model provides a high-capacity battery module with small-capacity battery cells connected in parallel doubly obtains the high-capacity battery module through the double parallel connection of the small-capacity battery cells, and obviously improves the utilization rate of the small-capacity battery cells; and through the two-stage parallelly connected, can improve battery module's stability. When using traditional parallel structure, battery control system need monitor the situation of charging of every parallelly connected electric core, and adopt the utility model discloses dual parallel structure only needs the situation of charging of the parallelly connected electric core of control one-level, and the inside low capacity electric core of the parallelly connected electric core of one-level need not to monitor again. Therefore, the battery monitoring difficulty is reduced.

2. The utility model provides a dual parallelly connected high capacity battery module of low capacity electric core encapsulates a plurality of naked electric cores in a packing simultaneously, independently encapsulates between each electric core unit, only through just, negative pole bridge parallel connection to draw out total anodal utmost point ear, total negative pole utmost point ear and external connection. When the battery is split into small battery cell units, the battery cells can be split along the packaging area between the battery cells, so that the battery can be utilized in scenes with low capacity requirements in a gradient manner, and the utilization value of the battery is fully excavated.

3. The utility model provides a dual parallelly connected high capacity battery module of low capacity electric core arranges the hollow structure electric core of the different diameters of multiunit with the form of concentric circles, forms the group battery, and rethread series connection or parallel connection obtain the group battery of different capacity, satisfy different power supply demands. Due to the arrangement, the arrangement of the battery cells is simple, and the occupied space is obviously reduced compared with the traditional combination arrangement of a plurality of cylindrical battery cells; when the large battery core needs to be split into the small battery cores, the shell and the positive and negative electrode bridges are only needed to be removed, and all the sub-battery cores are split, so that the assembly, the disassembly and the recycling are convenient.

4. The utility model provides a dual parallelly connected high capacity battery module of low capacity electric core, hollow structure electric core that preferred external diameter is greater than the height carries out the parallelly connected arrangement of concentric circles formula. By the arrangement, more tabs can be led out from the edges of the positive and negative current collectors through the design of the shape of the disc, so that the internal resistance of the battery cell is reduced; meanwhile, the disc-shaped shell of the battery core has larger upper and lower surface areas, thereby being beneficial to heat dissipation of the battery core. The center of the battery core is of a hollow structure, and a heat dissipation system, a fire extinguishing system and the like can be arranged in the hollow structure, so that the cooling performance and the safety performance of the battery core are further improved. The utility model discloses a lower internal resistance, big heat radiating area's setting can satisfy more high-power demand of filling down soon.

Drawings

Fig. 1 is the structure diagram of the small-capacity cell of the present invention.

Fig. 2 is the utility model discloses the soft packet of packaging structure of parallelly connected electric core of one-level schematic diagram.

Fig. 3 is the utility model discloses the parallelly connected electric core of second grade soft-packaged packaging structure's of electric core structural schematic.

Fig. 4 is a schematic structural diagram of a small-capacity battery cell obtained by splitting the first-stage parallel battery cell in fig. 2.

Fig. 5 is the utility model discloses the independent structure sketch of moulding that seals of soft packet of packaging structure of parallelly connected electric core of one-level.

Fig. 6 is the utility model discloses the square packaging structure's of parallelly connected electric core of one-level schematic structural diagram.

Fig. 7 is a schematic structural diagram of a small-capacity cell obtained by splitting the first-stage parallel cell in fig. 6.

Fig. 8 is another schematic structural diagram of the small-capacity cell of the present invention.

Fig. 9 is a schematic view of a winding structure of the battery cell in fig. 8.

Fig. 10 is a schematic structural view of the cylindrical packaging structure of the one-level parallel cell of the present invention.

Fig. 11 is a schematic cross-sectional view of the battery pack of fig. 10.

Fig. 12 is a cross-sectional view taken along the line a-a in fig. 11.

Reference numerals

10-small capacity cell; 11-a naked cell body; 12-a package structure; 13-positive pole tab; 14-a negative electrode tab; 15-tab glue layer; 20-first-level parallel connection of battery cells; 21-total positive electrode tab; 22-total heat sealing glue; 23-an aluminum positive bridge; 24-total negative tab; 25-nickel negative bridge; 26-single core connection structure; 27-outer assembly shell; 28-heat sealing glue; 29-external plastic sealing bag; 30-two-stage parallel battery cells; 31-a negative pole patch; 32-positive pole switching piece;

10' -a cell body; 11' -a positive electrode plate; 111' -a positive electrode tab; 112' -positive current collector; 113' -a positive electrode; 12' -a negative pole piece; 121' -a negative electrode tab; 122' -an anode current collector; 123' -negative electrode; 13' -a separator; 14' -sub-relief valves; 15' -a cell casing; 20' -hollow structure; 30' -a heat sink; 101' -first sub-cell; 102' -a second sub-cell; 103' -a third sub-cell; 40' -total pressure relief valve; 41' -total positive electrode; 42' -total negative electrode; 43' -positive bridge; 44' -a negative bridge; 50' -the total shell of the battery cell; 60' -heat insulation layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to specific embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the specific embodiments, and other details not relevant to the present invention are omitted.

In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

An object of the utility model is to design a but battery module structure of split for electric automobile, its capacity is great usually, after the battery retires, can disassemble this battery module structure into a plurality of small capacity electricity cores, and the echelon is utilized in the less scene of requirement for capacity to the value of utilizing of fully excavating the battery.

The specific scheme is as follows:

referring to fig. 1 to 3, the present invention provides a high-capacity battery module with dual parallel small-capacity battery cells, which includes a first-stage parallel battery cell 20 and a second-stage parallel battery cell 30 obtained by connecting a plurality of first-stage parallel battery cells 20 in parallel; the primary parallel battery cell 20 includes a plurality of small-capacity battery cells 10 connected in parallel.

So set up, the total capacity of high capacity battery module is the capacity sum of the parallelly connected electric core 20 of one-level of a plurality of, and when there was the difference in the capacity of the parallelly connected electric core 20 of one-level of a plurality of, whole battery module can only charge to the parallelly connected electric core 20 full of state of one-level that the capacity is minimum. Therefore, although the capacity of the battery module can be increased by connecting the cells in parallel, the capacity consistency of the cells connected in parallel needs to be strictly controlled. The utility model discloses a dual parallelly connected high capacity battery module that obtains of low capacity electricity core 10 is equivalent to and has carried out further segmentation with the monomer electric core in the high capacity electricity core of prior art equipment to improve low capacity electricity core 10's utilization ratio, parallelly connected through the two-stage moreover, can improve the stability of battery module. When using traditional parallel structure, battery control system need monitor the situation of charging of every parallelly connected electric core, and adopt the utility model discloses dual parallel structure only needs the situation of charging of the parallelly connected electric core 20 of control one-level, and the inside low capacity electricity core 10 of the parallelly connected electric core 20 of one-level need not to monitor again. Therefore, in actual production, when the cell capacity is selected, only the capacity of the one-level parallel cell 20 needs to be selected, so that the capacity of the one-level parallel cell 20 is close to that of the small-capacity cell 10 inside the one-level parallel cell 20 does not need to be selected.

In some embodiments, the capacity of the small-capacity battery cell is 10Ah, and the capacity of the high-capacity battery module is 40Ah, so that the battery module can be used for an electric vehicle with a high requirement on the capacity of the battery, when the battery pack is out of service, the large-capacity battery cell is split, the small-capacity battery cell can be used in a scene with a low requirement on the capacity in a gradient manner, and the utilization value of the battery is fully excavated.

The number of the small-capacity battery cells connected in parallel in the first-stage parallel battery cells is 2-8, and the number of the first-stage parallel battery cells connected in parallel in the second-stage parallel battery cells is 2-8. The number of the parallel-connected battery cores is not too large, and the problem of inconsistent capacity is prevented.

Specifically, referring to fig. 1, each of the small-capacity battery cells 10 includes a bare cell body 11, a positive electrode tab 13 and a negative electrode tab 14 connected to the bare cell body 11, and a packaging structure 12 for packaging the bare cell body 11; one end of the positive electrode tab 13 and one end of the negative electrode tab 14 are connected with the bare cell body 11, and the other end of the positive electrode tab is exposed outside the packaging structure 12; and tab glue layers 15 are arranged at the connection parts of the positive tab 13 and the negative tab 14 and the packaging structure 12.

Referring to fig. 2, the positive electrode tabs 13 of a plurality of small-capacity battery cells 10 are connected through an aluminum positive electrode bridge 23, and the negative electrode tabs 14 are connected through a nickel positive electrode bridge 25, so as to obtain a primary parallel battery cell 20.

The packaging structure 12 of the small-capacity battery cell 10 is a cylindrical packaging structure, a soft package packaging structure or a square packaging structure.

Every parallelly connected electric core 20 of one-level is equipped with total positive pole utmost point ear 21 and total negative pole utmost point ear 24 (total positive pole utmost point ear 21 and total negative pole utmost point ear 24 department are equipped with total heat seal glue 22), a plurality of connect in parallel electric core 20 of one-level between the total positive pole utmost point ear 21 link to each other through anodal switching piece 32, connect to each other through negative pole switching piece 31 between the total negative pole utmost point ear 24, obtain the parallelly connected electric core 30 of second grade.

So set up, encapsulate a plurality of naked electric cores simultaneously in a packing, independently encapsulate between each electric core unit, only through just,

negative pole bridge

23, 25 parallel connection to draw out total positive pole utmost point ear 21, total negative pole utmost point ear 24 and external connection. When the cells are split into small cell units, the cells can be split along the packaging area between the cells, and the capacity is 1/n (n is the number of the primary parallel cells 20).

The utility model also provides an above-mentioned technical scheme the dual parallel high capacity battery module's of low capacity electricity core recycle method, include: the secondary parallel battery cell of the retired high-capacity battery module is split to obtain a plurality of groups of retired primary parallel battery cells, and the secondary of the retired primary parallel battery cells is applied to the power supply field of the power battery with corresponding small-capacity requirements according to the capacity of the retired primary parallel battery cells.

And further splitting the plurality of groups of retired primary parallel battery cores obtained by splitting to obtain a plurality of retired small-capacity battery cores, and applying the retired small-capacity battery cores to the power supply field of power batteries with corresponding smaller capacity requirements according to the capacity of the retired small-capacity battery cores.

Example 2

Referring to fig. 8 to 12, a high-capacity battery module with dual parallel small-capacity cells is different from that in embodiment 1 in that each small-capacity cell in the primary parallel cells 20 is a cell with a hollow structure, and mainly includes a cell body 10 ' and a hollow structure 20 ' in the cell body 10 '. A plurality of cells with hollow structures are arranged in the form of concentric circles and then connected in parallel. For example, the first sub-cell 101 ', the second sub-cell 102 ', and the third sub-cell 103 ' in fig. 10 have the same central symmetry axis, and thus, the arrangement realizes the close arrangement of multiple groups of cells, the spatial layout is more reasonable, and the heat dissipation effect is better.

In some embodiments, a hollow structure is arranged between two adjacent large-diameter hollow structure battery cells, and a heat dissipation device or a heat insulation material constituting the heat insulation layer 60' and the like can be arranged inside the hollow structure. So set up, can further promote the radiating effect of group battery.

The outer side of each group of large-diameter hollow structure battery cells is provided with a battery cell shell 15 ', and the outermost side of the concentric circle battery pack is provided with a battery cell total shell 50'; the cell shell 15 ' is provided with a sub pressure relief valve 14 ', and the cell main shell 50 is provided with a main pressure relief valve 40 '. So set up, can the exhaust of independent pressure release or synchronous pressure release exhaust, the practicality is stronger.

Connected in parallel, the capacity of each group of large-diameter hollow structure battery cells should be kept basically the same. Therefore, the diameter of the outer electric core winding body is larger and the thickness is reduced correspondingly when winding. The anodes 113 'of the multiple groups of cells are connected in parallel through anode bridges (aluminum), and the cathodes 123' are connected in parallel through cathode bridges. So set up, laying between the multiunit electricity core is more reasonable, compares the permutation and combination between a plurality of traditional cylinder electricity cores, and the space occupies littleer, can set up multiunit cooling system through the hollow structure between the electricity core, satisfies the heat dissipation demand of group battery. Other auxiliary function modules can be arranged between the hollow structures, so that more possibilities are provided for the arrangement of the multifunctional battery pack.

In particular, the outer diameter of the cell with the hollow structure is larger than the height of the cell, and the positive electrode tab 111 'and the negative electrode tab 121' of the cell with the hollow structure are respectively arranged at two ends of the cell with the hollow structure in the height direction. The outer diameter, the inner diameter and the height of the battery cell with the hollow structure meet the following conditions: the outer diameter is more than or equal to 5 cm; 1/4 the outer diameter is not less than 1/2; 1/3 the height of the outer diameter is less than or equal to the outer diameter of the outer pipe. Preferably, the battery core with the hollow structure has an outer diameter of 10cm, an inner diameter of 4cm and a height of 5 cm.

Specifically, as shown in fig. 9, the battery cell body 10 ' mainly includes a positive electrode plate 11 ', a negative electrode plate 12 ', and a separator 13 ' disposed between the positive electrode plate 11 ' and the negative electrode plate 12 ', and the positive electrode plate 11 ', the negative electrode plate 12 ', and the separator 13 ' are wound to obtain the battery cell with the hollow structure.

The positive electrode plate 11 'and the negative electrode plate 12' are respectively provided with a plurality of groups of positive electrode tabs 111 'and negative electrode tabs 121' at their longer edges (the longer edges are the edges in the diameter direction of the cell body 10 'after winding, which also makes the outer diameter of the cell body 10' larger than its height), the plurality of groups of positive electrode tabs 111 'are connected with the positive electrode 113' through the positive electrode current collector 112 ', and the plurality of groups of negative electrode tabs 121' are connected with the negative electrode 123 'through the negative electrode current collector 122'. The battery cell with the hollow structure further comprises a battery cell shell 15 ' arranged outside the battery cell body 10 ', a pressure relief valve 14 ' is further arranged on the battery cell shell 15 ', and the pressure relief valve 14 ' and the positive electrode 113 ' are arranged on the same side of the battery cell shell 15 '.

The decommissioned primary parallel battery cores are further disassembled (only the battery core total shell 50 'and the positive and negative electrode bridges of the concentric circle primary parallel battery core 20 are removed, and all the sub-battery cores (the first sub-battery core 101', the second sub-battery core 102 'and the third sub-battery core 103') are disassembled, so that the assembly, the disassembly and the recycling are convenient), a plurality of decommissioned small-capacity battery cores are obtained, and the decommissioned small-capacity battery cores are applied to the power supply field of power batteries with corresponding smaller capacity requirements according to the capacity of the decommissioned small-capacity battery cores.

To sum up, the utility model provides a dual parallelly connected high capacity battery module of low capacity electricity core obtains the parallelly connected electric core of one-level with the parallelly connected electric core of low capacity, obtains dual parallelly connected high capacity battery module with the parallelly connected electric core of one-level again, has not only enlarged the echelon utilization scene of low capacity electricity core, has still improved the capacity stability of battery, reduces the battery control degree of difficulty. The concentric circles of the hollow-structure battery cell are connected in parallel, so that the internal resistance of the battery cell can be reduced, the heat dissipation effect is improved, and the spatial layout is more reasonable. The utility model discloses not only enlarged the echelon of low capacity electricity core and utilized the scene, still improved the capacity stability of battery, reduced the battery control degree of difficulty, fully excavated the value of utilization of battery.

The above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-capacity battery module with small-capacity battery cells in double parallel connection is characterized by comprising a primary parallel battery cell and a secondary parallel battery cell obtained by connecting a plurality of primary parallel battery cells in parallel; the first-level parallel battery cell comprises a plurality of small-capacity battery cells connected in parallel.

2. The high-capacity battery module with the dual parallel small-capacity battery cells as claimed in claim 1, wherein each of the small-capacity battery cells is a battery cell with a hollow structure, and a plurality of the battery cells with the hollow structures are arranged in concentric circles and then connected in parallel.

3. The high-capacity battery module with the dual-parallel small-capacity battery cells as claimed in claim 2, wherein a hollow structure is disposed between two adjacent battery cells with the hollow structure.

4. The high-capacity battery module with the dual parallel small-capacity battery cells as claimed in claim 2, wherein the battery cells with the hollow structures have an outer diameter larger than the height thereof, and the positive electrode tabs and the negative electrode tabs of the battery cells with the hollow structures are respectively disposed at two ends of the battery cells with the hollow structures in the height direction.

5. The dual parallel high-capacity battery module of small-capacity cells of claim 1, wherein each of the small-capacity cells comprises a bare cell body, a positive electrode tab and a negative electrode tab connected to the bare cell body, and an encapsulation structure for encapsulating the bare cell body; one ends of the positive electrode lug and the negative electrode lug are connected with the naked electric core body, and the other ends of the positive electrode lug and the negative electrode lug are exposed outside the packaging structure; and tab glue layers are arranged at the connection parts of the positive electrode tab and the negative electrode tab with the packaging structure.

6. The dual parallel high-capacity battery module of small-capacity cells according to claim 5, wherein the positive electrode tabs of the small-capacity cells are connected through an aluminum positive electrode bridge, and the negative electrode tabs are connected through a nickel positive electrode bridge, so as to obtain a primary parallel cell.

7. The dual parallel high-capacity battery module of small capacity battery cells of claim 5, wherein the packaging structure of the small capacity battery cells is a cylindrical packaging structure, a soft package packaging structure or a square packaging structure.

8. The dual parallel high-capacity battery module of small-capacity cells according to claim 1, wherein each of the first-stage parallel cells is provided with a total positive electrode tab and a total negative electrode tab, the total positive electrode tabs of the plurality of first-stage parallel cells are connected through a positive electrode adapter sheet, and the total negative electrode tabs are connected through a negative electrode adapter sheet, so as to obtain a second-stage parallel cell.