Lithium iron phosphate cell structure and uninterruptible power supply

Abstract

The utility model discloses a lithium iron phosphate cell structure and an uninterruptible power supply, and relates to the technical field of energy storage equipment. The battery cell group is arranged in the cavity of the shell; and the heat dissipation assembly is arranged in the cavity of the shell and is close to the battery cell group. According to the technical scheme provided by the utility model, the arrangement mode of the battery cells is optimized, and the overall battery cell structure is improved, so that the technical problems that the existing lithium iron phosphate battery cell structure is unreasonable in layout, and the battery performance and the service life are easily influenced are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage equipment technical field especially relates to a kind of lithium iron phosphate battery cell structure and uninterruptible power supply. BACKGROUND

[0002] In modern power supply system, UPS (uninterruptible power supply) plays a key role in providing emergency power when the power is interrupted. With the increasing demand for power supply stability and continuity, the energy storage capacity and performance of UPS become particularly important. Lithium iron phosphate battery gradually becomes the ideal choice for UPS energy storage module due to its high energy density, long cycle life, safety and other advantages.

[0003] However, the existing lithium iron phosphate battery cell structure layout is unreasonable, which can easily affect the performance and service life of the battery. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of lithium iron phosphate battery cell structure, to solve the technical problem that the existing lithium iron phosphate battery cell structure layout is unreasonable, which can easily affect the performance and service life of the battery.

[0005] For the above purpose, the lithium iron phosphate battery cell structure provided by the utility model comprises:

[0006] A housing with a cavity inside;

[0007] A cell group arranged in the cavity of the housing; and

[0008] A heat dissipation assembly arranged in the cavity of the housing and close to the cell group.

[0009] In an embodiment, the cell group is arranged in at least two groups along the length direction of the cavity, and a heat dissipation channel is formed between the two adjacent cell groups, and the heat dissipation assembly is arranged in the heat dissipation channel.

[0010] In an embodiment, the cell group comprises:

[0011] A cell arranged in at least two along the width direction of the cavity; and

[0012] A connecting piece arranged on the cell, and the electrodes of the two adjacent cells are connected through the connecting piece, and the electrodes of each cell and the connecting piece are fixed by laser welding.

[0013] In an embodiment, the connecting piece is in the shape of a wave.

[0014] In an embodiment, the lithium iron phosphate battery cell structure further comprises a busbar arranged in the cavity of the shell, the busbar is electrically connected with at least two groups of the battery cell groups to form a battery module by connecting the at least two groups of the battery cell groups in series.

[0015] In an embodiment, the lithium iron phosphate battery cell structure further comprises an insulation protective layer arranged on the outer surface of the busbar to reduce the short circuit phenomenon between the battery cells.

[0016] In an embodiment, the heat dissipation assembly comprises:

[0017] a heat dissipation fin, each of the battery cells is provided with a heat dissipation fin on the opposite sides of the heat dissipation channel to conduct the heat generated by the battery cells to the air in the heat dissipation channel; and

[0018] a heat dissipation fan arranged in the heat dissipation channel, the air outlet direction of the heat dissipation fan is towards the heat dissipation fin or the battery cell.

[0019] In an embodiment, the shell is provided with a ventilation opening, each of the heat dissipation channels is provided with a ventilation opening, and the lithium iron phosphate battery cell structure comprises a dust screen arranged in the ventilation opening.

[0020] In an embodiment, the lithium iron phosphate battery cell structure further comprises a buffer layer arranged on the inner wall of the shell, the buffer layer abuts against the battery cell group to absorb the energy generated when the battery cell group is impacted by external force.

[0021] The utility model further provides a kind of uninterrupted power supply including lithium iron phosphate battery cell structure, lithium iron phosphate battery cell structure, comprising:

[0022] a shell with a cavity inside;

[0023] a battery cell group arranged in the cavity of the shell; and

[0024] a heat dissipation assembly arranged in the cavity of the shell and close to the battery cell group.

[0025] The technical scheme provided by the utility model discloses a shell can protect the internal electric core group and the heat dissipation assembly from physical damage and environmental influence. The electric core group is the basic unit of storing electric energy, can store electric energy for subsequent use, and can meet different voltage and capacity requirements. At the same time, the heat dissipation assembly can dissipate the heat generated by the electric core group during charging and discharging into the air to maintain the battery performance and prolong the battery life. Moreover, the heat dissipation assembly is arranged close to the electric core group, which can improve the heat conduction efficiency and effectively reduce the working temperature of the battery. In addition, the heat dissipation assembly can also provide additional structural support for the electric core group, enhancing the rigidity and stability of the entire battery pack. The technical scheme provided by the utility model embodiment can improve the rationality of the lithium iron phosphate battery structure and optimize the performance and safety of the battery pack by optimizing the layout of the lithium iron phosphate battery structure. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in these drawings without creating any creative labor.

[0027] Figure 1 Structure diagram of the embodiment of the lithium iron phosphate battery structure provided by the utility model Figure 1 ;

[0028] Figure 2 Structure diagram of the embodiment of the lithium iron phosphate battery structure provided by the utility model Figure 2 ;

[0029] Figure 3 The utility model provides the embodiment of the electric core group's three-dimensional structure schematic diagram.

[0030] Explanation of reference numerals:

[0031] 10, shell; 11, vent; 20, electric core group; 21, electric core; 22, connecting piece; 30, heat dissipation assembly; 31, heat dissipation fin; 32, heat dissipation fan; 40, heat dissipation channel; 50, busbar; 60, insulating protective layer; 70, dust screen; 80, buffer interlayer.

[0032] The realization, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0034] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0035] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0036] For the structure of lithium iron phosphate battery cells, many battery cell structures used in UPS energy storage modules have unreasonable layout problems. The connection mode between the battery cells can cause excessive resistance, affecting the overall charge and discharge efficiency of the battery pack. At the same time, during the operation of the UPS energy storage module, the lithium iron phosphate battery cells will generate heat, which will affect the performance and service life of the battery if not dissipated in time, and even may cause safety hazards. Moreover, the mechanical stability of the existing battery cell group is insufficient, and when subjected to external forces such as vibration and impact, the battery cells are prone to looseness and the connection components are prone to damage, thereby affecting the normal operation of the UPS.

[0037] Therefore, the embodiments of the present application provide a lithium iron phosphate battery cell structure, which forms a battery cell group by series and parallel combination of battery cells, optimizes space utilization, ensures reasonable heat dissipation and fixation of the battery cell group, and facilitates circuit connection, thereby improving the performance and service life of the battery pack.

[0038] In order to better understand the above technical solutions, the above technical solutions will be described in detail below with reference to the drawings.

[0039] As Figure 1 , Figure 2 , Figure 3 The utility model discloses a lithium iron phosphate battery cell structure, including:

[0040] The shell 10 has a cavity inside;

[0041] The battery cell group 20 is arranged in the cavity of the shell 10; and

[0042] The heat dissipation assembly 30 is arranged in the cavity of the shell 10 and close to the battery cell group 20.

[0043] In the technical scheme adopted in the embodiment, the shell 10 can protect the battery cell group 20 and the heat dissipation assembly 30 inside from physical damage and environmental influence. The battery cell group 20 is a basic unit for storing electric energy, which can store electric energy for subsequent use and meet different voltage and capacity requirements. At the same time, the heat dissipation assembly 30 can dissipate the heat generated by the battery cell group 20 during charging and discharging to the air to maintain the battery performance and prolong the battery life. Moreover, the heat dissipation assembly 30 is arranged close to the battery cell group 20, which can improve the heat conduction efficiency and effectively reduce the working temperature of the battery. In addition, the heat dissipation assembly 30 can also provide additional structural support for the battery cell group 20 to enhance the rigidity and stability of the entire battery pack. The technical scheme proposed in the embodiment can improve the rationality of the lithium iron phosphate battery cell structure and optimize the performance and safety of the battery pack by optimizing the layout of the lithium iron phosphate battery cell structure.

[0044] Specifically, the lithium iron phosphate battery cell structure includes the shell 10, the battery cell group 20 and the heat dissipation assembly 30.

[0045] The shell 10 is made of high-strength, fireproof and explosion-proof engineering plastic, which can provide physical protection and structural support.

[0046] The battery cell group 20 is arranged in the cavity of the shell 10 and used for realizing the storage and release of electric energy. The battery cell group 20 can be composed of multiple lithium iron phosphate battery cells 20 and can be configured in series, parallel or series-parallel. It can be understood that the group arrangement of the battery cells can improve the efficiency, reduce material consumption and weight, and thus improve the energy density of the battery system. Moreover, the stability of the battery cell structure can be improved, and the risk of damage caused by vibration or impact can be reduced. In the embodiment, the multiple lithium iron phosphate battery cells are arranged in an array, which can improve the space utilization and facilitate circuit connection.

[0047] The heat dissipation assembly 30 is used to realize heat dissipation of the battery cell group 20, and it can be understood that the heat generated by the battery cell group 20 can be dissipated in time through the heat dissipation assembly 30, so as to reduce the accumulation of heat and improve the service life of the battery cell structure. The heat dissipation assembly 30 can be a radiator, which can conduct the heat generated by the battery cell group 20 to the air when the battery cell group 20 works, and then take away the generated heat along with the air flow. Moreover, the radiator is arranged close to the battery cell group 20, which can absorb and disperse the force generated by external impact and vibration, thereby reducing the risk of damage to the battery cell group 20.

[0048] Further, referring to Figure 2 In an embodiment of the present application, the battery cell group 20 is arranged at intervals along the length direction of the cavity, and the heat dissipation channel 40 is formed between the adjacent two battery cell groups 20, and the heat dissipation assembly 30 is arranged in the heat dissipation channel 40.

[0049] In the technical scheme adopted in this embodiment, by arranging at least two battery cell groups 20, the total energy output of the battery cell structure can be increased, and higher charging efficiency can be realized. It can be understood that the plurality of battery cells in the battery cell structure are divided into a plurality of parts in the form of battery cell groups 20, and the current is reasonably distributed, so as to optimize the charging and discharging performance of the battery cells and improve the overall efficiency and service life. In this embodiment, the heat dissipation channel 40 is formed between the adjacent two battery cell groups 20, which can increase the air flow and improve the heat dissipation efficiency. In addition, the heat dissipation channel 40 can effectively block or delay the spread of thermal runaway. When thermal runaway occurs in one of the battery cell groups 20, the heat dissipation channel 40 can act as a heat shield to reduce the heat transfer to the surrounding other battery cell groups 20 and reduce the risk of continuous thermal runaway. The heat dissipation assembly 30 is arranged in the heat dissipation channel 40, which can further conduct the heat generated by the battery cell group 20 and dissipate the heat to the air.

[0050] Further, referring to Figure 3 In an embodiment of the present application, the battery cell group 20 comprises:

[0051] The battery cell 21 is arranged at intervals along the width direction of the cavity, and

[0052] The connecting piece 22 is arranged on the battery cell 21, the electrodes of the adjacent two battery cells 21 are connected through the connecting piece 22, and the electrodes of each battery cell 21 and the connecting piece 22 are fixed through laser welding.

[0053] In the technical scheme adopted in the embodiment, the cell group 20 can include a plurality of cells 21 and connecting pieces 22. In the embodiment, the cell 21 is the basic structure of the cell group 20, and at least two cells 21 are arranged in sequence along the width direction of the cavity. The connecting piece 22 is used to connect the electrodes of adjacent cells 21 to realize the electrical connection between the cells 21. It can be understood that the positive electrode and the negative electrode of each cell 21 are connected by the connecting piece 22 respectively, and an internal circuit of the cell group 20 can be formed. In the embodiment, the connecting piece 22 is made of a metal material with low resistance, such as copper alloy, which can reduce the contact resistance and improve the current transmission efficiency.

[0054] Further, referring to Figure 2 、 Figure 3 In an embodiment of the utility model, the connecting piece 22 is in the shape of a wave.

[0055] In the technical scheme adopted in the embodiment, by so arranging, the connecting area can be increased, thereby reducing the contact resistance and ensuring stable electrical connection. The wave-shaped connecting piece 22 can provide better structural stability, reduce the bending of the connecting piece 22 between the cells 21 when the cell group 20 is deformed due to temperature change, and improve the fatigue resistance of the connecting piece 22.

[0056] Further, referring to Figure 2 In an embodiment of the utility model, the lithium iron phosphate cell structure further includes a bus bar 50 arranged in the cavity of the shell 10, and the bus bar 50 is electrically connected with the at least two cell groups 20 to connect the at least two cell groups 20 in series to form a battery module.

[0057] In the technical scheme adopted in the embodiment, by arranging the bus bar 50, the currents of the plurality of cell groups 20 can be collected together and distributed to the output end of the battery module. Moreover, the use of the bus bar 50 can optimize the space utilization between the cell groups 20, so that the cell groups 20 are more compact, and the energy density of the battery group is improved. On the other hand, the bus bar 50 can also enhance the structural stability of the cell group 20 and provide additional support and fixation for the cell group 20.

[0058] Further, referring to Figure 2 In an embodiment of the utility model, the lithium iron phosphate cell structure further includes an insulating protective layer 60 arranged on the outer surface of the bus bar 50 to reduce the occurrence of short circuit between the cells 21.

[0059] In the technical scheme adopted in the embodiment, the insulation protection layer 60 is arranged to provide necessary insulation protection, effectively reduce the risk of current leakage and short circuit, and ensure the electrical safety of the battery system. The insulation protection layer 60 can be detachably connected with the busbar 50, for example, by clamping, bolting or the like, so that the insulation protection layer 60 covers the surface of the busbar 50.

[0060] Further, referring to Figure 2 In an embodiment of the utility model, the heat dissipation assembly 30 comprises:

[0061] The heat dissipation fins 31 are arranged on the opposite sides of each battery cell 21 facing the heat dissipation channels 40, so as to conduct the heat generated by the battery cell 21 to the air in the heat dissipation channels 40; and

[0062] The heat dissipation fan 32 is arranged in the heat dissipation channel 40, and the air outlet direction of the heat dissipation fan 32 faces the heat dissipation fins 31 or the battery cell 21.

[0063] In the technical scheme adopted in the embodiment, the heat dissipation assembly 30 further comprises the heat dissipation fins 31 and the heat dissipation fan 32. It can be understood that the heat generated by the battery cell 21 during charging and discharging can be conducted to the two heat dissipation channels 40 through the heat dissipation fins 31 on the opposite sides, so as to improve the heat conduction efficiency and quickly dissipate heat. The heat dissipation fan 32 can accelerate the air flow and accelerate the heat dissipation from the heat dissipation fins 31 to the surrounding environment, thereby improving the heat dissipation efficiency. In the embodiment, when the battery cell group 20 is working, the heat dissipation fins 31 conduct the heat of the battery cell 21 to the air, and then the heat dissipation fan 32 is started to make the air flow quickly in the heat dissipation channel 40 and take away the heat conducted by the heat dissipation fins 31.

[0064] Further, referring to Figure 1 、 Figure 2 In an embodiment of the utility model, the shell 10 is provided with the air vents 11, and each heat dissipation channel 40 is correspondingly provided with an air vent 11. The lithium iron phosphate battery cell structure comprises the dust screen 70, and the dust screen 70 is arranged in the air vent 11.

[0065] In the technical scheme adopted in the embodiment, the air vents 11 are arranged to promote the air circulation in the interior of the battery cell structure, accelerate the heat dissipation from the battery cell group 20 to the surrounding environment, and improve the heat dissipation efficiency. Moreover, each heat dissipation channel 40 is correspondingly provided with an air vent 11, so that the air vent 11 can further promote the air circulation in cooperation with the heat dissipation fan 32. In addition, the dust screen 70 is arranged on each air vent 11, which can reduce the dust entering the interior of the lithium iron phosphate battery cell structure and reduce the influence on the heat dissipation and electrical performance. The dust screen 70 can be detachably connected with the side wall of the shell 10, for example, by clamping, bolting or the like.

[0066] Further, referring to Figure 2In the embodiment of the present application, the lithium iron phosphate battery cell structure further comprises a buffer interlayer 80 arranged on the inner wall of the shell 10, and the buffer interlayer 80 is in abutment with the battery cell group 20 to absorb the energy generated when the battery cell group 20 is subjected to external force impact.

[0067] In the technical scheme adopted in the embodiment, the buffer interlayer 80 arranged can absorb the energy generated when the battery cell group 20 is subjected to external force impact, thereby reducing the risk of damage to the battery cell 21. In the embodiment, the buffer interlayer 80 can be made of an elastic material, such as rubber.

[0068] The present application also provides an uninterruptible power supply comprising the lithium iron phosphate battery cell structure of the above embodiments. The specific structure of the lithium iron phosphate battery cell structure is referred to the above embodiments. Since the present uninterruptible power supply adopts all the technical schemes of the above embodiments, it at least has all the beneficial effects brought by the technical schemes of the above embodiments, which will not be repeated here.

[0069] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the technical concept of the present application, as well as the content of the present application specification and drawings, are included in the patent protection scope of the present application.

Claims

1. A lithium iron phosphate cell structure, characterized in that, The lithium iron phosphate battery structure comprises: a shell having a cavity inside; a plurality of cell groups arranged in the cavity of the shell; and a heat dissipation assembly arranged in the cavity of the shell and close to the cell groups. The cell groups are arranged in at least two groups along the length direction of the cavity, and a heat dissipation channel is formed between the adjacent two cell groups, and the heat dissipation assembly is arranged in the heat dissipation channel.

2. The lithium iron phosphate cell structure of claim 1, wherein, The cell group comprises:

3. The lithium iron phosphate cell structure of claim 2, wherein, at least two cells arranged in the width direction of the cavity; and a connecting piece arranged on the cell, and the electrodes of the adjacent two cells are connected through the connecting piece, and the electrodes of each cell and the connecting piece are fixed by laser welding. The connecting piece is in a wave shape.

4. The lithium iron phosphate cell structure of claim 3, wherein, The lithium iron phosphate battery structure further comprises a busbar arranged in the cavity of the shell, and the busbar is electrically connected with the at least two cell groups to connect the at least two cell groups in series to form a battery module.

5. The lithium iron phosphate cell structure of claim 2, wherein, The lithium iron phosphate battery structure further comprises an insulating protective layer arranged on the outer surface of the busbar to reduce the short circuit phenomenon between the cells.

6. The lithium iron phosphate cell structure of claim 5, wherein, The heat dissipation assembly comprises:

7. The lithium iron phosphate cell structure of claim 3, wherein, a heat dissipation fin arranged on the opposite sides of each cell facing the heat dissipation channel to conduct the heat generated by the cell to the air in the heat dissipation channel; and a heat dissipation fan arranged in the heat dissipation channel, and the air outlet direction of the heat dissipation fan is towards the heat dissipation fin or the cell. The shell is provided with a ventilation opening, and each heat dissipation channel is provided with a ventilation opening, and the lithium iron phosphate battery structure comprises a dust screen arranged in the ventilation opening.

8. The lithium iron phosphate cell structure of claim 7, wherein, The lithium iron phosphate battery structure further comprises a buffer layer arranged on the inner wall of the shell, and the buffer layer abuts against the cell group to absorb the energy generated when the cell group is impacted by external force.

9. The lithium iron phosphate cell structure of claim 1, wherein, The lithium iron phosphate battery structure comprises the lithium iron phosphate battery structure according to any one of claims 1-9.

10. An uninterruptible power supply, characterized by ​

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