CN221080161U - Single battery and energy storage system - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery and an energy storage system. The battery cell comprises a containing component and a plurality of battery cells, the battery cells are connected in series and/or in parallel, each battery cell comprises a battery cell main body, a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are all located at the top of the battery cell main body, the containing component comprises a containing box and a support cover plate, a plurality of independent containing grooves are arranged in the containing box at intervals, each battery cell is contained in each containing groove, the support cover plate covers the top of each battery cell, and the support cover plate is connected with the corresponding containing box so as to seal each battery cell in the corresponding containing groove. Through directly assembling a plurality of electric cores into single battery, improved single battery's storage capacity to single battery can replace traditional battery module, has simplified the assembly process by a wide margin, improves structural stability, improves electric property, improves the security performance and reduces composite cost, also is favorable to energy storage system's uniformity and reliability.

Description

Single battery and energy storage system

Technical Field

The utility model relates to the technical field of batteries, in particular to a single battery and an energy storage system.

Background

At present, a large-scale energy storage battery is generally assembled into a battery module by serially connecting the outside of single batteries, then assembled into a battery cluster by the battery module, and then further assembled into an energy storage system. Taking the conventional 20-ruler container energy storage as an example, the 2MWh energy storage system is formed by connecting 1600 more than 280Ah single batteries in series, so that the number of the single batteries is large, and the assembly difficulty is greatly increased.

In addition, for the energy storage system, a typical large-scale energy storage system needs to ensure a service life of 10-20 years, and the capacity and internal resistance difference between the single batteries are increased due to long-time operation, so that the output power of the energy storage system can be continuously reduced along with the increase of the capacity difference of the single batteries. Meanwhile, as the capacity difference of the single batteries increases, the energy storage system can cause overcharge or overdischarge of the single batteries when working, and the safety risk increases. In the aspect of management of the energy storage system, because the number of the single batteries is too large, the management system is difficult to balance and control the electric quantity of each single battery, and the consistency and the reliability of each single battery are difficult to ensure. In addition, in order to ensure the consistency and reliability of each single battery in the working process of the energy storage system, the investment of material cost, labor cost and production equipment cost is greatly increased.

Therefore, a single battery and an energy storage system are needed to solve the above problems.

Disclosure of utility model

A first object of the present utility model is to provide a single battery, which can improve the storage capacity of the single battery, is convenient to assemble, can replace the traditional battery module, can greatly simplify the assembly process, improve the structural stability, improve the electrical performance, improve the safety performance and reduce the comprehensive cost.

The second object of the present utility model is to provide an energy storage system, which can reduce the number of single batteries, is beneficial to ensuring the consistency and reliability of each single battery, greatly simplifies the assembly process of the energy storage system, and reduces the material cost, the labor cost and the investment of the production equipment cost.

To achieve the purpose, the utility model adopts the following technical scheme:

The single battery comprises a plurality of battery cells, wherein the battery cells are connected in series and/or in parallel, the battery cells comprise a battery cell main body, a positive electrode lug and a negative electrode lug, and the positive electrode lug and the negative electrode lug are both positioned at the top of the battery cell main body; the single battery further includes:

The storage assembly comprises a storage box and a support cover plate, a plurality of independent storage grooves are formed in the storage box at intervals, each storage groove is internally provided with one battery cell, the support cover plate covers the top of each battery cell, and the support cover plate is connected with the storage box so as to seal each battery cell in the corresponding storage groove.

As a preferable scheme, the accommodating box is made of flexible insulating materials;

Preferably, the material of the accommodating box is ABS plastic, polycarbonate, polyoxymethylene, polypropylene, polyethylene, polyphenyl ether or polyvinyl chloride.

Preferably, insulating fireproof materials are arranged on the groove wall of each containing groove.

As a preferred aspect, the unit cell further includes:

The electric connection assembly comprises a connection bracket and a connection sheet arranged on the connection bracket, the connection bracket is paved and connected on the bracket cover plate, the positive electrode lug and the negative electrode lug of each electric core extend out of the bracket cover plate and are connected with the connection sheet, and the connection sheet is provided with a positive electrode leading-out end and a negative electrode leading-out end;

Preferably, the positive tab and the negative tab are both welded to the connecting piece.

As a preferred aspect, the unit cell further includes:

The battery shell comprises a battery box body and a battery cover plate which are connected, wherein an accommodating space is formed by surrounding the battery box body and the battery cover plate together, the accommodating component is positioned in the accommodating space, an exhaust channel is formed in the accommodating space, the exhaust channel is positioned at the bottom of the accommodating box, a pressure relief valve which can be communicated with the exhaust channel is arranged on the battery box body, pressure relief scores are formed on the bottom wall of each accommodating groove, and the pressure relief scores can be broken under the action of air pressure so as to enable the accommodating grooves to be communicated with the exhaust channel;

Preferably, a supporting boss is disposed at the bottom of the accommodating case, and the supporting boss abuts against the bottom wall of the battery case, so that the exhaust passage is formed between the bottom of the accommodating case and the bottom wall of the battery case.

As a preferred aspect, the unit cell further includes:

The liquid cooling system comprises a liquid cooling pipeline, the liquid cooling pipeline is arranged on the inner top wall of the battery cover plate, one end of the liquid cooling pipeline is communicated with a cooling liquid inlet, the other end of the liquid cooling pipeline is communicated with a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are both positioned on the battery box body;

Preferably, the liquid cooling system further comprises an electric valve, and the electric valve is arranged on the liquid cooling pipeline;

Preferably, the single battery further comprises a temperature detection assembly, wherein the temperature detection assembly is in signal connection with the liquid cooling system and is configured to detect the temperature in the accommodating box;

Preferably, the temperature detection component is in signal connection with the electric valve.

Preferably, a heat conducting material is filled between the electric connection assembly and the battery cover plate.

As a preferred scheme, the single battery further comprises a fixing plate and a quick connector, the quick connector comprises an anode quick connector and a cathode quick connector, the fixing plate is arranged on the battery shell, the fixing plate is provided with the anode quick connector and the cathode quick connector, and the anode lead-out end and the cathode lead-out end extend out of the battery shell and are respectively connected with the anode quick connector and the cathode quick connector;

Preferably, the positive electrode lead-out end and the negative electrode lead-out end are respectively welded with the positive electrode quick-connection joint and the negative electrode quick-connection joint.

As a preferable scheme, a first liquid injection hole is formed in the battery shell, a liquid injection channel communicated with the first liquid injection hole is arranged in the accommodating box, and each accommodating groove is communicated with the liquid injection channel;

Preferably, the single battery further comprises a sealing plug, and the sealing plug is detachably installed in the first liquid injection hole to seal the first liquid injection hole.

Preferably, the exterior of the battery case is coated with an insulating coating;

Preferably, the material of the insulating coating is epoxy resin or UV glue.

An energy storage system comprising a single cell as described above.

The utility model has the beneficial effects that:

The utility model provides a single battery, which comprises a containing assembly and a plurality of electric cores, wherein the electric cores are connected in series and/or in parallel, each electric core comprises an electric core main body, a positive electrode lug and a negative electrode lug, the positive electrode lug and the negative electrode lug are respectively positioned at the top of the electric core main body, the containing assembly comprises a containing box and a bracket cover plate, a plurality of independent containing grooves are formed in the containing box at intervals, each containing groove is internally provided with one electric core, the bracket cover plate covers the top of each electric core, and the bracket cover plates are connected with the containing box so as to seal each electric core in the corresponding containing groove. Through directly assembling a plurality of electric cores into single battery, the storage capacity of single battery has been improved greatly to single battery can replace traditional battery module, has simplified the process of equipment by a wide margin, has saved the structural component and the connector of electric core structure spare, module, has reduced the input of material cost, cost of labor and production facility cost. Due to the great simplification of the assembly process, the consistency and reliability of the single battery are greatly improved. In addition, because anodal ear and negative pole ear all are located the top of electric core main part to the top of electric core is located to the support apron lid, is convenient for realize the connection of holding box and support apron more, is convenient for realize the equipment to single battery. In addition, the battery cells are separated and assembled, so that heat accumulation among the battery cells can be reduced, and the heat dissipation efficiency is improved, thereby improving the safety of the single battery; the electrolyte infiltration dead angle between the electric cores can be reduced when the electric cores are separated and assembled for injecting the electrolyte, the electrolyte infiltration effect of the whole single battery is improved, the ion transmission path is shortened, the interface resistance of the battery is reduced, and the rate performance, the discharge capacity, the cycle life and other electrical properties of the whole single battery are improved; each cell is independently accommodated in each accommodating groove, so that the fixity and the supportability of the cell are not reduced even if the number of the cells is increased, and the structural stability of the whole single battery is improved; thereby solving the problem that the existing single battery is greatly limited in the aspect of capacity expansion.

The utility model also provides an energy storage system, which is characterized in that the single batteries are adopted to replace the traditional battery modules to be directly assembled into a battery cluster or an energy storage system, so that the number of the single batteries in the energy storage system is greatly reduced, the assembly process is greatly simplified, the consistency and the reliability of the single batteries in the energy storage system are favorably ensured, the balancing and the management and control functions on the single batteries can be enhanced, the operation life of the system is prolonged, and the safety of the system is improved; the battery module replaces the traditional battery module, the topological structure of the energy storage system (comprising an assembly system, a battery management system and a fire protection system) is greatly simplified, the grouping efficiency and the operation efficiency of the energy storage system are improved, the operation energy consumption is reduced, the system connectors are also reduced, and the material cost, the labor cost and the investment of the production equipment cost are reduced.

Drawings

Fig. 1 is an isometric view of a single battery provided in an embodiment of the present utility model;

fig. 2 is a rear view of a unit cell according to an embodiment of the present utility model;

fig. 3 is an exploded view of a unit cell according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of an assembly structure of a battery cell and a bracket cover plate according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a single battery with a battery cover plate hidden in the single battery according to an embodiment of the present utility model;

FIG. 6 is a top view of a receiving box provided by an embodiment of the present utility model;

FIG. 7 is an isometric view of a receiving box provided in an embodiment of the present utility model;

FIG. 8 is a schematic diagram of a battery cover plate and a liquid cooling pipeline according to an embodiment of the present utility model;

fig. 9 is a flowchart of a method for manufacturing a single battery according to an embodiment of the present utility model.

In the figure:

1. A battery cell; 11. a positive electrode tab; 12. a negative electrode ear; 13. a cell body; 2. an accommodating assembly; 21. a housing case; 211. a receiving groove; 2111. decompression nick; 212. a support boss; 213. an avoidance groove; 214. a second liquid injection hole; 22. a bracket cover plate; 221. a positioning pin; 3. an electrical connection assembly; 31. a connecting bracket; 32. a connecting sheet; 321. a positive electrode lead-out end; 322. a negative electrode lead-out terminal; 4. a battery case; 41. a battery case; 411. a pressure release valve; 412. a data interface; 413. penetrating holes; 42. a battery cover plate; 43. an accommodating space; 44. a first liquid injection hole; 5. a liquid cooling pipeline; 51. a cooling liquid inlet; 52. a cooling liquid outlet; 6. a sealing plug; 7. a fixing plate; 71. and (5) quick-connection joints.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

At present, the large-scale energy storage battery is generally assembled into a battery module by connecting the outside of the single batteries in series, and then assembled into a battery cluster or an energy storage system by the battery module, so that the number of the single batteries in the energy storage system is more, and the assembly difficulty is greatly increased. In addition, for the energy storage system, the capacity and internal resistance difference between the single batteries are increased due to long-time work, the output power of the energy storage system can be continuously reduced along with the increase of the capacity difference of the single batteries, and as the capacity difference of the single batteries is increased, individual single batteries can be overcharged or overdischarged during the work of the energy storage system, so that the safety risk is increased. In addition, in order to ensure the consistency and reliability of each single battery in the working process of the energy storage system, the investment of material cost, labor cost and production equipment cost is greatly increased.

In order to solve the above-mentioned problems, as shown in fig. 1-3, the present embodiment provides a single battery, which includes a housing assembly 2 and a plurality of electric cells 1, wherein the electric cells 1 are connected in series and/or in parallel, the electric cells 1 include a main electric cell body 13, a positive electrode tab 11 and a negative electrode tab 12, the positive electrode tab 11 and the negative electrode tab 12 are all located at the top of the main electric cell body 13, the housing assembly 2 includes a housing box 21 and a support cover plate 22, a plurality of independent housing slots 211 are arranged in the housing box 21 at intervals, each of the housing slots 211 is provided with one electric cell 1, the support cover plate 22 covers the top of the electric cell 1, and the support cover plate 22 is connected with the housing box 21 to seal each electric cell 1 in the corresponding housing slot 211. The single battery provided by the embodiment directly assembles the plurality of battery cells 1 into the single battery, so that the storage capacity of the single battery is greatly improved, the single battery can replace a traditional battery module, the assembly process is greatly simplified, the structural components and connectors of the battery cell structural components and modules are saved, and the investment of material cost, labor cost and production equipment cost is reduced. Due to the great simplification of the assembly process, the consistency and reliability of the single battery are greatly improved. In addition, because the positive electrode lug 11 and the negative electrode lug 12 are both positioned at the top of the battery cell main body 13, and the bracket cover plate 22 covers the top of the battery cell 1, the connection between the accommodating box 21 and the bracket cover plate 22 is more convenient to realize, and the assembly of the single battery is convenient to realize. In the present embodiment, the number of the battery cells 1 is preferably two or more.

In addition, the battery cells 1 are separated and assembled, so that heat accumulation among the battery cells 1 can be reduced, and the heat dissipation efficiency is improved, thereby improving the safety of the single battery; in addition, electrolyte infiltration dead angles among the battery cells 1 can be reduced when the battery cells 1 are separated and assembled for liquid injection, the electrolyte infiltration effect of the whole single battery is improved, an ion transmission path is shortened, the interface resistance of the battery is reduced, and the rate performance, the discharge capacity, the cycle life and other electrical properties of the whole single battery are improved; each cell 1 is individually accommodated by each accommodating groove 211, so that the fixability and supportability of the cell 1 are not lowered even if the number of the cells 1 is increased, and the structural stability of the whole single battery is improved; thereby solving the problem that the existing single battery is greatly limited in the aspect of capacity expansion.

In this embodiment, the multiple battery cells 1 are all connected in parallel, the capacity of one battery cell 1 is 300Ah, the battery cell 1 is 1S56P, and the energy of the single battery is 53.76KWh.

In this embodiment, the battery cell 1 is designed as a tab on the same side, that is, the positive tab 11 and the negative tab 12 of the battery cell 1 are both located at the top of the battery cell main body 13. Each of the electric cells 1 may be independently a lamination structure or a winding structure, and each of the electric cells 1 may be independently a bipolar ear structure, a multipolar ear structure or a full-pole ear structure, and the specific form of the electric cell 1 is not limited in this embodiment. In addition, in this embodiment, the thickness of the battery cell 1 may be 15mm to 30mm, the height of the battery cell 1 may be 60mm to 200mm, and the width of the battery cell 1 may be 150mm to 400mm.

Inside the existing single battery, the battery core is in hard contact with the shell after being circularly expanded. The battery cell shell can not absorb the stress after the expansion of the battery cell, and the battery cell is stressed unevenly, so that the lithium is locally separated from the inside of the battery cell, the cycle life of the battery cell is reduced, and potential safety hazards occur.

In order to solve the above problem, preferably, in this embodiment, the accommodating box 21 is made of a flexible insulating material, so that the accommodating box 21 not only has good insulating performance, but also has a certain elastic modulus, when the battery cell 1 is expanded to a certain extent in the recycling process, hard contact between the battery cell 1 and the groove wall of the accommodating groove 211 is avoided, so that the stress of the battery cell 1 is more uniform, the risk of lithium precipitation of the battery cell 1 in the later stage of recycling is reduced, the safety of the single battery is greatly improved, and the recycling service life of the single battery is also ensured. Specifically, in the present embodiment, the material of the housing case 21 includes any one or a combination of any plurality of ABS plastic, polycarbonate, polyoxymethylene, polypropylene, polyethylene, polyphenylene oxide, and polyvinyl chloride, thereby ensuring the insulation and elastic modulus of the housing case 21.

Preferably, in this embodiment, an insulating fireproof material may be further disposed on the wall of each accommodating groove 211, so that the insulating fireproof material has an abrasion-proof and insulating effect for replacing mylar film, thereby preventing the battery cell 1 from being scratched in the process of being placed into the accommodating groove 211, further playing an insulating effect, further improving the protection of the battery cell 1, and also having a heat-resistant and fireproof effect. It should be noted that, because the electric cells 1 are located in different accommodating grooves 211, the electric cells 1 are separated, and insulating fireproof materials are disposed on the groove walls of each accommodating groove 211, heat accumulation between the electric cells 1 can be reduced, even when one electric cell 1 in the single battery burns due to internal heat accumulation, the influence on other electric cells 1 can be reduced, and the safety of the single battery is greatly improved. Specifically, the insulating fireproof material may be disposed on the wall of the accommodating groove 211 by spraying, pasting, printing, or the like. In addition, the insulating fireproof material may be ceramic, asbestos, or the like.

In this embodiment, as shown in fig. 3 and 4, a support cover 22 is disposed on the top of each cell 1, and the support cover 22 is used for hermetically accommodating the corresponding cell 1 in the corresponding accommodating groove 211. The plurality of holder covers 22 are provided separately and/or integrally with the plurality of battery cells 1. It should be noted that, in other embodiments, the bracket cover 22 may also be in a whole plate form, so that one bracket cover 22 seals and accommodates all the cells 1 in the corresponding accommodating grooves 211. Because the support cover plate 22 is located at the tab side of the battery cell 1, in this embodiment, the support cover plate 22 may be designed into a two-plate assembly form, where the two plates are assembled to form the position of avoiding the positive tab 11 and the negative tab 12 of the battery cell 1, so that the positive tab 11 and the negative tab 12 extend out of the support cover plate 22. In addition, the bracket cover plate 22 is also provided with a positioning pin 221, and the positioning pin 221 is inserted and fixed in a positioning hole of the accommodating box 21, so that the accurate positioning and installation of the bracket cover plate 22 and the accommodating box 21 are ensured. Preferably, in this embodiment, the accommodating assembly 2 further includes a sealing ring (not shown in the drawings), and the sealing ring is sandwiched between the bracket cover 22 and the accommodating box 21, so as to further ensure the sealing effect on the accommodating groove 211. In the present embodiment, the thickness t of the holder cover 22 is 1mm to 5mm. Specifically, t may be 1mm, 2mm, 3mm, 4mm or 5mm.

In addition, as shown in fig. 3 and 5, the single battery provided in this embodiment further includes an electrical connection assembly 3, the electrical connection assembly 3 includes a connection bracket 31 and a connection piece 32 disposed on the connection bracket 31, the connection bracket 31 is laid and connected on the bracket cover 22, and the positive tab 11 and the negative tab 12 of each cell 1 extend out of the bracket cover 22 and are connected with the connection piece 32, and the connection piece 32 is provided with a positive lead-out end 321 and a negative lead-out end 322. By providing the connecting tabs 32, a series and/or parallel connection between the individual cells 1 is achieved. In this embodiment, after the positive tab 11 and the negative tab 12 of the battery cell 1 are shaped, the positive tab 11 and the negative tab 12 are connected with the connecting piece 32 through laser penetration welding, so that stability and reliability of connection between the positive tab 11 and the negative tab 12 and the connecting piece 32 are ensured. In other embodiments, the positive electrode tab 11, the negative electrode tab 12, and the connecting tab 32 may be connected by ultrasonic welding, resistance welding, or the like.

In this embodiment, as shown in fig. 1 to 3, the single battery further includes a battery housing 4, where the battery housing 4 includes a battery case 41 and a battery cover 42 that are connected, and the battery case 41 and the battery cover 42 enclose together to form a containing space 43, and the containing assembly 2 is located in the containing space 43. By providing the battery housing 4 and then placing the receiving assembly 2 with the battery cell 1 in the receiving space 43 in the battery housing 4, the protection of the battery cell 1 and the electrical connection assembly 3 is improved. In the present embodiment, the battery case 41 and the battery cover 42 may be sealed by laser welding, ultrasonic welding, resistance welding, or the like.

In order to enhance the high temperature resistance, strength and stability of the battery case 4, the battery case 4 is preferably made of metal materials such as aluminum, steel, etc., so that the battery case 4 can be prevented from leaking, deforming and being damaged, and has good supporting and protecting effects on high-capacity contents.

Preferably, in the present embodiment, the outside of the battery case 4 is coated with an insulating coating, thereby achieving an insulating effect on the battery case 4. Specifically, the material of the insulating coating can be epoxy resin or UV glue.

Further, as shown in fig. 1 and 3, the unit cell further includes a fixing plate 7, the fixing plate 7 is provided on the cell housing 4, and the fixing plate 7 serves to support, fix and protect the positive electrode lead-out 321 and the negative electrode lead-out 322 of the connection piece 32 from deformation and breakage, and furthermore, the fixing plate 7 also serves to mount a quick-connect connector 71, the quick-connect connector 71 enabling quick-connect connection of the unit cell in series or in parallel with other external devices. And the fixing plate 7 is also used to be mounted on a case of an energy storage system or on a frame of a battery cluster. In this embodiment, two quick connectors 71, respectively, are disposed on the fixing plate 7 at intervals, and are electrically connected to the positive electrode lead-out end 321 and the negative electrode lead-out end 322 of the connecting piece 32. Since the specific structure and connection principle of the quick connector 71 are related art, the description thereof will not be repeated here.

In the prior art, the lithium ion battery assembly process can be generally divided into two types according to different tab extraction modes: the same side electrode tab and the different side electrode tab. The same side tab outlet process is to weld the positive electrode tab and the negative electrode tab with the positive electrode cover plate and the negative electrode cover plate respectively, and weld the periphery after entering the shell. The process of discharging the tab from the opposite side comprises the steps of firstly welding the negative electrode tab with the negative electrode cover plate, then welding a longer connecting sheet for the positive electrode tab, firstly welding one side of the connecting sheet with the positive electrode cover plate after the connecting sheet is put into the shell, and then welding the other side of the connecting sheet with the positive electrode cover plate. The same-side tab outlet process needs to cut out a large number of redundant tabs, so that the problems of stricter winding precision requirements and reduction of specific power of the battery cells can be brought; and the size of the battery core needs to be strictly controlled, the requirement on the precision of equipment is higher, and the process difficulty is higher. The different-side tab outlet process can cause the length of one side tab to be too long, and occupy the top space of the shell, so that the specific energy of the battery core can be reduced; and the lengths of the two side tabs are different, so that the overcurrent capacity of the two side tabs is different, and the safety risk of the battery is increased.

The above problems may not be apparent in the general unit cell, but as the capacity of the battery is continuously increased, the problems become more and more apparent, seriously affecting the difficulty of the manufacturing process, the capacity expansibility, the service life, the electrical properties, and the safety properties of the battery. Therefore, the common same-side tab outlet process and different-side tab outlet process are not suitable for a single battery high-capacity scheme. Therefore, a new tab extraction process and structure are necessary.

In this embodiment, as shown in fig. 3, the battery cell 1 is designed as a tab on the same side, that is, the positive tab 11 and the negative tab 12 of the battery cell 1 are both located at the top of the battery cell main body 13. Two grooves which are respectively provided for the positive electrode lug 11 and the negative electrode lug 12 to extend out are formed in the top of each bracket cover plate 22 corresponding to each battery cell 1. The positive electrode lug 11 and the negative electrode lug 12 of each cell 1 extend out of the groove of the bracket cover plate 22 and are connected with the connecting sheet 32. Two avoidance grooves 213 are formed in the accommodating box 21 at intervals, two penetrating holes 413 are formed in the battery box 41 at intervals, and the positive electrode leading-out end 321 and the negative electrode leading-out end 322 of the connecting sheet 32 extend out of the two avoidance grooves 213 and the two penetrating holes 413 respectively and are electrically connected with the corresponding quick-connection connectors 71.

It should be noted that, unlike the existing battery, the single battery of this embodiment has a different lead-out conductive manner, and the positive tab 11 and the negative tab 12 of each battery cell 1 respectively extend from two grooves of each bracket cover 22 and are connected with the connecting piece 32; the positive electrode lead-out end 321 and the negative electrode lead-out end 322 of the connecting sheet 32 respectively extend out of the two avoidance grooves 213 of the accommodating box 21 respectively from the two penetrating holes 413 of the battery box body 41 respectively, and are respectively connected with the positive electrode quick-connection joint and the negative electrode quick-connection joint. This way, the soft lugs and the connecting pieces 32 can be well supported, fixed and protected, and deformation and fracture of the soft lugs and the connecting pieces can be prevented; the welding of the lug and the connecting sheet 32 is facilitated, and the assembly of the single battery is facilitated; the path of the conductive circuit formed by the tab and the connecting sheet 32 can be shortened, the width of the conductive circuit can be increased, and the current overload capacity of the single battery can be improved; the lengths of the two side lugs of each battery cell 1 are ensured to be the same, so that the overcurrent capacity of the two side lugs is the same, and the safety risk of the single battery is reduced; the quick connector 71 is used as an external conductive terminal, so that the electric connection between the single battery and an external circuit is facilitated.

In this embodiment, as shown in fig. 2, the battery housing 4 is further provided with a data interface 412, and real-time data monitoring and transmission of the single battery can be achieved through the data interface 412. In the present embodiment, the battery case 4 is provided with one data interface 412, and in other embodiments, there may be any number of two, three, or the like. Since the specific structure and transmission principle of the data interface 412 are in the prior art, the details are not described herein.

In the existing single battery, electrolyte is consumed along with the circulation of the battery, and the electrolyte in the battery cannot be supplemented because the electrolyte injection hole is welded and sealed in the assembly process.

In order to solve the above-mentioned problem, in the present embodiment, as shown in fig. 3 and 5, the first liquid injection hole 44 is formed in the battery case 4, a liquid injection channel (not shown in the drawings) that communicates with the first liquid injection hole 44 is provided in the housing case 21, and each of the housing grooves 211 is in communication with the liquid injection channel, ensuring that the electrolyte can be injected into each of the housing grooves 211 through the first liquid injection hole 44 and the liquid injection channel. Specifically, in the present embodiment, the first liquid injection hole 44 is located at the top of the battery housing 4, that is, the first liquid injection hole 44 is communicated with the liquid injection channel after penetrating the entire battery cover 42 on the battery cover 42, so as to ensure the communication effect between the first liquid injection hole 44 and the liquid injection channel. Preferably, in the present embodiment, two first injection holes 44 are spaced apart from each other on the battery cover 42, so that the injection efficiency of the unit battery is improved. It should be noted that, the top of the accommodating box 21 is provided with a second liquid injection hole 214 corresponding to the first liquid injection hole 44, the second liquid injection hole 214 and the liquid injection channel are sequentially communicated, and the liquid injection channel may be a groove or a pipeline formed in the accommodating groove 211, and extends from the position of the second liquid injection hole 214 at the top of the accommodating box 21 to each accommodating groove 211.

Preferably, as shown in fig. 1 and 2, the single battery further includes a sealing plug 6, and the sealing plug 6 is detachably mounted in the first liquid injection hole 44 to seal the first liquid injection hole 44. Through setting up demountable installation's sealing plug 6, when the inside electrolyte of battery cell is not enough, can take out sealing plug 6 from first notes liquid hole 44 to carry out the secondary fluid infusion to the battery cell through first notes liquid hole 44, guaranteed battery cell's life. To improve the sealing performance of the first filling hole 44, the sealing plug 6 is preferably made of a flexible material, and is preferably a structure with a large top and a small bottom, for example, the sealing plug 6 may be a sealing rubber plug. In order to facilitate the disassembly and the assembly, the top of the sealing plug 6 is provided with a disassembly part which facilitates the screwing or the pulling out of the sealing plug 6.

The heat in the existing single battery can only be diffused through natural conduction, and the heat dissipation efficiency is low. The liquid cooling system is used for radiating the battery pack, so that uneven heat distribution in the battery is easy to cause, and the battery pack is particularly obvious in high-capacity batteries.

In order to solve the above-mentioned problem, in this embodiment, as shown in fig. 5 and 8, the single battery further includes a liquid cooling system, the liquid cooling system includes a liquid cooling pipeline 5, the liquid cooling pipeline 5 is disposed on an inner top wall of the battery cover plate 42, and one end of the liquid cooling pipeline 5 is communicated with the cooling liquid inlet 51, and the other end of the liquid cooling pipeline 5 is communicated with the cooling liquid outlet 52, thereby realizing a circulating heat dissipation effect on the battery cell 1 and ensuring normal operation of the battery cell 1. Because the heat of the single battery often generates at the lug of the battery cell 1, the liquid cooling pipeline 5 is arranged on the inner top wall of the battery cover plate 42, so that the battery cover plate 42 acts as a liquid cooling plate, the lug of the battery cell 1 can be quickly conducted, and the quick heat conduction effect on the battery cell 1 is realized. In the present embodiment, the cooling liquid inlet 51 and the cooling liquid outlet 52 are both located on the battery case 41. Preferably, in this embodiment, the liquid cooling pipeline 5 is in a serpentine shape, so that the heat dissipation effect on each battery cell 1 is further ensured, and the temperature distribution inside the single battery is more uniform. Preferably, the liquid cooling system further comprises an electric valve, the electric valve is arranged on the liquid cooling pipeline 5, and the electric valve is used for adjusting circulation and closing of the liquid cooling pipeline 5.

Preferably, in this embodiment, the heat conducting material is filled between the electrical connection assembly 3 and the battery cover plate 42, so that the heat conducting effect on the battery core 1 is further improved, the heat inside the single battery can be quickly conducted to the outside of the battery shell 4, and the uniformity of the temperature inside the single battery is further ensured. And substances with flame retardant and heat conducting properties can be selected for filling, and the substances include but are not limited to heat conducting silica gel, phase change heat conducting materials, heat conducting gaskets, heat conducting pouring sealants and the like.

In this embodiment, the single battery further includes a temperature detection component (not shown in the figure), where the temperature detection component is disposed in the accommodating box 21 and is in signal connection with an electric valve of the liquid cooling system, the temperature detection component is used to detect the temperature in the accommodating box 21, and the liquid cooling system can control the circulation and closure of the liquid cooling pipeline 5 by controlling the switch of the electric valve such as the electromagnetic valve according to the detection value of the temperature detection component, so as to realize the temperature control of the interior of the single battery. Specifically, the temperature detecting component may be a temperature sensor, and the temperature sensor is located in the accommodating space 43.

Most of the existing single batteries are square aluminum shells or blade batteries, and explosion-proof valves of the existing single batteries are arranged on the pole column sides. When the battery is out of control, internal pollutants are sprayed out, so that the pollution degree in the module is increased, and a large-area internal short circuit is easily caused, so that a fire disaster of the system is caused.

In order to solve the above-described problems, in the present embodiment, preferably, as shown in fig. 5 and 6, a vent passage (not shown) is formed in the accommodating space 43 and is located at the bottom of the accommodating case 21, a pressure release valve 411 capable of communicating with the vent passage is provided on the battery case 41, a pressure release score 2111 is provided on the bottom wall of each accommodating groove 211, and the pressure release score 2111 can be broken by the action of air pressure to allow the accommodating grooves 211 to communicate with the vent passage. When the electric core 1 is out of control, can make the gaseous in the storage tank 211 discharge the battery case 4 through bottom pressure release nick 2111, exhaust passage and relief valve 411 in proper order, realize the quick pressure release to storage tank 211, prevent that heat from piling up in the battery cell is inside, guaranteed the security of battery cell. In addition, because pressure release nick 2111, exhaust passage and relief valve 411 all are located the bottom of electric core 1, when electric core 1 takes place thermal runaway, the inside pollutant of electric core 1 is discharged from the bottom of electric core 1, has realized the effective isolation of discharged pollutant and electrical connection subassembly 3, has stopped the risk of taking place large tracts of land short circuit. It should be noted that, the thickness of the pressure relief score 2111 is smaller than the thickness of the groove wall of the accommodating groove 211, the pressure relief score 2111 is more easily exploded when being pressed, the pressure value required by the pressure relief score 2111 being broken and the pressure value required when the pressure relief valve 411 is used for pressure relief are set according to the requirement. In the present embodiment, the shape of the relief score 2111 is not limited, and may be a groove shape, a linear shape, or the like. In this embodiment, two pressure release valves 411 are disposed on the battery case 41 at intervals, so as to further improve the reliability of pressure release of the unit battery. In other embodiments, a relief valve 411 may be disposed on the battery case 41, or three relief valves 411 or even more relief valves 411 may be disposed, and may be specifically disposed according to requirements.

In the present embodiment, as shown in fig. 7, the bottom of the housing case 21 is provided with the support boss 212, and the support boss 212 abuts against the bottom wall of the battery case 41, so that an exhaust passage is formed between the bottom of the housing case 21 and the bottom wall of the battery case 41. In the present embodiment, a part of the support boss 212 is located at the edge of the bottom of the accommodating case 21, and a part of the support boss 212 is located at the non-edge area of the bottom of the accommodating case 21, so that the support boss 212 also has the effect of reinforcing the structural strength of the accommodating case 21.

For the large-capacity single battery, as the capacity of the single battery and the number of the electric cores 1 are increased, the heat inside the single battery is easy to accumulate, and the heat dissipation is very difficult, when any electric core 1 in the single battery is burnt or exploded due to the accumulation of the heat inside, the whole single battery is easy to cause fire or explosion, so that the safety of the single battery is lower. Therefore, the safety problem is a great difficulty and importance for the large-capacity unit cell.

According to the embodiment, the specific liquid cooling system, the heat conducting material, the exhaust channel and the pressure release valve 411 are combined, and the liquid cooling system and the heat conducting material can conduct heat to the battery cell 1 rapidly, so that the rapid heat conducting effect to the battery cell 1 is achieved, heat in the battery cell can be conducted to the outside rapidly, and the uniformity of the temperature in the battery cell is further guaranteed; through the exhaust channel and the pressure release valve 411, when the battery cell 1 is out of control, gas in the accommodating groove 211 can be discharged out of the battery shell 4 through the bottom pressure release notch 2111, the exhaust channel and the pressure release valve 411 in sequence, so that the rapid pressure release of the accommodating groove 211 is realized, the accumulation of heat in the single battery is prevented, and the safety of the single battery is ensured; in addition, because pressure release nick 2111, exhaust passage and relief valve 411 all are located the bottom of electric core 1, when electric core 1 takes place thermal runaway, the inside pollutant of electric core 1 is discharged from the bottom of electric core 1, has realized the effective isolation of discharged pollutant and electric coupling assembling 3, has stopped the risk that takes place large tracts of land short circuit, has further guaranteed battery cell's security.

The embodiment also provides an energy storage system, which comprises a plurality of single batteries, wherein the single batteries are connected in series and/or in parallel. According to the energy storage system provided by the embodiment, the battery clusters or the energy storage system is directly assembled by adopting the single batteries instead of the traditional battery modules, so that the number of the single batteries in the energy storage system is greatly reduced, the assembly process is greatly simplified, the consistency and the reliability of the single batteries in the energy storage system are guaranteed, the balancing and the management and control functions on the single batteries can be enhanced, the operation life of the system is prolonged, and the safety of the system is improved; the battery module replaces the traditional battery module, the topological structure of the energy storage system (comprising an assembly system, a battery management system and a fire protection system) is greatly simplified, the grouping efficiency and the operation efficiency of the energy storage system are improved, the operation energy consumption is reduced, the system connectors are also reduced, and the material cost, the labor cost and the investment of the production equipment cost are reduced.

As shown in fig. 9, the present embodiment further provides a method for manufacturing a single battery, which is used for manufacturing the single battery, and the method for manufacturing the single battery includes the following steps:

One cell 1 is placed in each accommodation groove 211 of the accommodation box 21;

the bracket cover plate 22 is covered on the top of the battery cell 1, and the bracket cover plate 22 is connected with the accommodating box 21;

a plurality of cells 1 are connected in series and/or parallel.

The single battery manufacturing method provided by the embodiment greatly improves the storage capacity of the single battery, and the single battery can replace a traditional battery module, so that the assembly process is greatly simplified, and the material cost, the labor cost and the investment of production equipment cost are reduced. Due to the great simplification of the assembly process, the consistency and reliability of the single battery are greatly improved.

In addition, as shown in fig. 9, after the plurality of electric cores 1 are connected in series and/or in parallel, the accommodating assembly 2 is put into the battery case 4, and the accommodating assembly 2 after being put into the case is put into the oven for high-temperature vacuum baking for a preset time; in this example, the baking temperature is 60-80 ℃, and the preset time is set according to the baking temperature and the battery dryness (target water content) requirements.

After the baking operation is completed, the battery cell 1 in the accommodating assembly 2 is subjected to the liquid injection operation through the liquid injection port on the battery shell 4.

Since the subsequent manufacturing process of the single battery is consistent with the conventional manufacturing process of the aluminum shell battery, the following description is omitted.

Comparison experiment: the original energy storage system of 3MWh is formed by connecting 10 battery clusters in parallel, 1 battery cluster is formed by connecting 8 battery modules in series, and 1 battery module is formed by connecting 44 single lithium batteries with the capacity of 280Ah and the voltage of 3.2V in series.

The energy storage system of 3MWh of this embodiment is composed of 10 battery clusters connected in parallel, 1 battery cluster is composed of 8 single batteries of this embodiment connected in series, and 1 single battery is composed of 44 battery cells with capacity of 280Ah and voltage of 3.2V connected in series.

The energy storage system of 3MWh adopts above-mentioned battery cell to replace original battery module standard case to assemble into new energy storage system, compares in original energy storage system, and new energy storage system's integrated cost has reduced more than 30%, has still improved structural stability, electric property, security performance and packaging efficiency simultaneously.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (11)

1. The single battery comprises a plurality of electric cells (1), wherein a plurality of electric cells (1) are connected in series and/or in parallel, each electric cell (1) comprises an electric cell main body (13), a positive electrode lug (11) and a negative electrode lug (12), and the positive electrode lugs (11) and the negative electrode lugs (12) are both positioned at the top of the electric cell main body (13); the battery cell is characterized by further comprising:

The accommodating component (2), accommodating component (2) includes accommodation box (21) and support apron (22), the interval is provided with a plurality of independent accommodation grooves (211) in accommodation box (21), every all the accommodation groove (211) in the holding have one electric core (1), support apron (22) lid is located the top of electric core (1), and support apron (22) with accommodation box (21) are connected, in order to with every electric core (1) all seal in corresponding accommodation groove (211).

2. The single cell according to claim 1, wherein the housing case (21) is made of a flexible insulating material;

preferably, the material of the accommodating box (21) is ABS plastic, polycarbonate, polyoxymethylene, polypropylene, polyethylene, polyphenyl ether or polyvinyl chloride.

3. The single cell according to claim 1, wherein an insulating fireproof material is provided on the wall of each of the accommodation grooves (211).

4. A cell according to any one of claims 1 to 3, further comprising:

the electric connection assembly (3), the electric connection assembly (3) comprises a connection bracket (31) and a connection sheet (32) arranged on the connection bracket (31), the connection bracket (31) is paved and connected on the bracket cover plate (22), the positive electrode lug (11) and the negative electrode lug (12) of each electric core (1) extend out of the bracket cover plate (22) to be connected with the connection sheet (32), and the connection sheet (32) is provided with a positive electrode leading-out end (321) and a negative electrode leading-out end (322);

preferably, the positive electrode lug (11) and the negative electrode lug (12) are welded with the connecting sheet (32).

5. The cell of claim 4, further comprising:

The battery case (4), battery case (4) including battery box body (41) and battery apron (42) that are connected, battery box body (41) and battery apron (42) enclose jointly and establish and form accommodation space (43), accommodation subassembly (2) are located accommodation space (43) to be formed with the exhaust passage in accommodation space (43), the exhaust passage is located the bottom of accommodation box (21), be provided with on battery box body (41) and be provided with pressure release valve (411) that can lead to with the exhaust passage, all be provided with pressure release nick (2111) on the diapire of every accommodation groove (211), and pressure release nick (2111) can be broken under the effect of atmospheric pressure, so that accommodation groove (211) with the exhaust passage leads to;

preferably, a support boss (212) is provided at the bottom of the accommodating case (21), and the support boss (212) abuts against the bottom wall of the battery case (41) so that the exhaust passage is formed between the bottom of the accommodating case (21) and the bottom wall of the battery case (41).

6. The cell of claim 5, further comprising:

The liquid cooling system comprises a liquid cooling pipeline (5), the liquid cooling pipeline (5) is arranged on the inner top wall of the battery cover plate (42), one end of the liquid cooling pipeline (5) is communicated with a cooling liquid inlet (51), the other end of the liquid cooling pipeline (5) is communicated with a cooling liquid outlet (52), and the cooling liquid inlet (51) and the cooling liquid outlet (52) are both positioned on the battery box body (41);

Preferably, the liquid cooling system further comprises an electric valve, and the electric valve is arranged on the liquid cooling pipeline (5);

Preferably, the single battery further comprises a temperature detection assembly in signal connection with the liquid cooling system, and the temperature detection assembly is configured to detect the temperature in the accommodating box (21);

Preferably, the temperature detection component is in signal connection with the electric valve.

7. The unit cell according to claim 5, characterized in that a heat conducting material is filled between the electrical connection assembly (3) and the battery cover plate (42).

8. The unit cell according to claim 5, further comprising a fixing plate (7) and a quick connector (71), wherein the quick connector (71) comprises a positive quick connector and a negative quick connector, the fixing plate (7) is arranged on the cell casing (4), the positive quick connector and the negative quick connector are arranged on the fixing plate (7), and the positive extraction end (321) and the negative extraction end (322) extend out of the cell casing (4) and are respectively connected with the positive quick connector and the negative quick connector;

Preferably, the positive electrode lead-out end (321) and the negative electrode lead-out end (322) are respectively welded with the positive electrode quick connector and the negative electrode quick connector.

9. The single battery according to claim 5, wherein a first liquid injection hole (44) is formed in the battery shell (4), a liquid injection channel communicated with the first liquid injection hole (44) is formed in the accommodating box (21), and each accommodating groove (211) is communicated with the liquid injection channel;

Preferably, the single battery further comprises a sealing plug (6), and the sealing plug (6) is detachably arranged in the first liquid injection hole (44) so as to seal the first liquid injection hole (44).

10. The unit cell according to claim 5, characterized in that the outside of the cell housing (4) is coated with an insulating coating;

Preferably, the material of the insulating coating is epoxy resin or UV glue.

11. An energy storage system comprising the cell of any one of claims 1-10.