Battery, battery assembly, energy storage device and electric equipment

Abstract

The utility model relates to a battery, a battery assembly, an energy storage device and electric equipment, the battery comprises a battery cell, a tab and a pole, and the tab is connected with the battery cell; the pole is connected with the tab; wherein the number of the tabs is P, the number of the poles is N, P is not equal to N, P and N are positive integers not smaller than 2, and at least one of P and N is larger than 2. Through the arrangement, the impedance of the battery can be reduced, the problems that the service life and the safety performance of the battery are influenced due to serious polarization and serious heat production when the battery is discharged are solved, meanwhile, the resistance increase caused by an overlong path of leading current into the pole through the tab can be avoided, and the process yield is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery, a battery assembly, an energy storage device and electrical equipment. Background Art

[0002] Power batteries are mainly used in new energy vehicles and have been developed for a long time. Energy storage batteries have developed rapidly in recent years. Power batteries are usually small in size and have only one positive column and one negative column. Energy storage batteries are designed based on power batteries. In order to pursue a larger capacity, the size of the battery will be enlarged. In the case of a larger battery with only one positive column and one negative column, the impedance of the battery will be very large, and the battery will be severely polarized and generate heat during discharge, which affects the battery's service life and safety performance. Utility Model Content

[0003] The utility model aims to provide a battery, a battery assembly, an energy storage device and an electrical device, which can solve the problems of large battery impedance, severe polarization during battery discharge and severe heat generation.

[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0005] In a first aspect, the utility model provides a battery, comprising: a battery cell; a pole tab connected to the battery cell; and a pole post connected to the pole tab; wherein the number of the pole tabs is P, and the number of the pole posts is N, satisfying: P≠N, P and N are both positive integers not less than 2, and at least one of P and N is greater than 2.

[0006] In one implementation, the following condition is also satisfied: 0.25≤P / N≤5.

[0007] In one embodiment, the electrode tab includes a positive electrode tab and a negative electrode tab, the electrode column includes a positive electrode column and a negative electrode column, the positive electrode tab and the negative electrode tab are both connected to the battery cell, the positive electrode column is connected to the positive electrode tab, the negative electrode column is connected to the negative electrode tab, the number of the positive electrode tabs is P1, the number of the positive electrode columns is N1, the number of the negative electrode tabs is P2, and the number of the negative electrode columns is N2, satisfying: 0.25≤P1 / N1≤5, 0.25≤P2 / N2≤5, P1, N1, P2, N2 are all positive integers, and at least one of P1, N1, P2, N2 is greater than 1.

[0008] In one implementation, the following conditions are also satisfied: 2≤N1≤20, 2≤N2≤20.

[0009] In one embodiment, the energy of the battery cell is E, and further satisfies: 1600Wh / cell ≤ E / N1 ≤ 4000Wh / cell, and / or 1600Wh / cell ≤ E / N2 ≤ 4000Wh / cell.

[0010] In one implementation, the battery has a length of L, a width of D, and a thickness of H, satisfying: 1000mm≤L≤5800mm, 400mm≤D≤2500mm, and 7mm≤H≤150mm.

[0011] In one implementation, the following condition is also satisfied: 1.5≤L / D≤14.5.

[0012] In one implementation manner, the lengths of the positive electrode column and the negative electrode column are both a, satisfying: 30 mm ≤ a ≤ 2000 mm, N1·a ≤ L, N2·a ≤ L.

[0013] In one implementation manner, the heights of the positive electrode column and the negative electrode column are both b, satisfying: 3mm≤b≤20mm.

[0014] In one embodiment, the battery further includes a shell and an explosion-proof valve, the battery cell is accommodated in the shell, the pole is connected to the shell and exposed outside the shell, and the pole is arranged on the same side or different sides of the shell, and the explosion-proof valve is arranged in the shell, wherein the number of the explosion-proof valves is F, satisfying: F is a positive integer and F≥2.

[0015] In a second aspect, the utility model further provides a battery assembly, comprising a plurality of batteries described in any one of the various embodiments of the first aspect, wherein the plurality of batteries are arranged in sequence.

[0016] In a third aspect, the utility model further provides an energy storage device, comprising a box body and the battery assembly described in the second aspect, wherein the box body encloses a receiving space, and the battery assembly is received in the receiving space.

[0017] In one implementation, the volume of the battery assembly is V1, and the volume of the receiving space is V2, satisfying: V1 / V2≥40%.

[0018] In a fourth aspect, the utility model further provides an electrical equipment, comprising an electrical device and an energy storage device as described in any embodiment of the third aspect, wherein the energy storage device supplies power to the electrical device.

[0019] The battery of the utility model sets the number of pole ears to P and the number of pole columns to N, satisfying: P≠N, P and N are both positive integers not less than 2, and at least one of P and N is greater than 2, thereby reducing the battery impedance and solving the problems of severe polarization and heat generation during battery discharge, which affect the service life and safety performance of the battery. At the same time, it can avoid the increase of resistance caused by the path of current being introduced into the pole column through the pole ears being too long, and ensure the process yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a schematic diagram of an energy storage device according to an embodiment;

[0022] Figure 2 is a perspective view of a battery of an embodiment;

[0023] Figure 3 is a plan view of a battery of an embodiment;

[0024] Figure 4 is a plan view of a battery of another embodiment;

[0025] Figure 5 is a plan view of a battery according to yet another embodiment.

[0026] Description of reference numerals:

[0027] 100-battery, 10-battery cell, 21-positive ear, 22-negative ear, 31-positive pole, 32-negative pole, 40-shell, 50-explosion-proof valve, 60-liquid injection hole, 200-gasket, 300-box, 310-door, 320-exhaust piece, 1000-battery assembly. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0031] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] Please refer to Figure 1 An embodiment of the present invention provides a battery assembly 1000, comprising a plurality of batteries 100 according to an embodiment of the present invention, wherein the plurality of batteries 100 are sequentially arranged along a thickness direction of the battery 100.

[0033] The embodiment of the utility model further provides an energy storage device, including a box body 300 and a battery assembly 1000 in the embodiment of the utility model. The box body 300 encloses a receiving space, and the battery assembly 1000 is received in the receiving space.

[0034] Figure 1 The structure of the box 300 of the energy storage device from two different perspectives is shown. Figure 1 The top left and bottom left are shown. A three-dimensional view of the battery assembly 1000 is also shown, as shown in FIG. Figure 1 The upper right side shows a partial structural explosion diagram of the battery assembly 1000. Figure 1 Shown below right.

[0035] The battery assembly 1000 includes a plurality of batteries 100, and the battery 100 is roughly in the shape of a thin plate with a large length and width and a thin thickness. The structure of the battery 100 will be described in detail later and will not be described in detail here. The plurality of batteries 100 are arranged in sequence, and can be arranged in sequence along at least one direction such as the thickness direction, the length direction, and the width direction. For example, the thickness direction of the battery 100 can be set to the vertical direction and the plurality of batteries 100 can be arranged in sequence along the thickness direction, so that the plurality of batteries 100 are arranged in sequence in the vertical direction to form a stacked structure. A pad 200 can be arranged between adjacent batteries 100 to play a role in support and heat insulation.

[0036] In this embodiment, the traditional battery box, battery rack and other structures can be eliminated, and multiple batteries 100 can be directly arranged in sequence along the thickness direction to form a whole, which can improve the space utilization inside the box 300 of the energy storage device, thereby improving the power and capacity of the energy storage device.

[0037] The box body 300 may be roughly in a cubic shape, and may be formed by connecting a basic frame and a plurality of flat panels, without any specific limitation.

[0038] The box 300 may be provided with an openable and closable door 310, and the receiving space of the box 300 may be entered by opening the door 310, so that the battery assembly 1000 can be installed in the receiving space, and the receiving space can also be entered for maintenance at a later time. When the battery 100 device is working normally, the door 310 is in a closed state to ensure that the receiving space is isolated from the outside.

[0039] An exhaust piece 320 may also be provided on the box body 300 . The exhaust piece 320 may specifically be a fan. The temperature and humidity of the accommodation space may be regulated by the exhaust piece 320 . When the battery assembly 1000 generates smoke, the smoke may also be exhausted by the exhaust piece 320 .

[0040] The energy storage device and battery assembly 1000 of the embodiment of the utility model adopt the battery 100 of the embodiment of the utility model, which can solve the problems of large impedance of the battery 100, severe polarization during discharge of the battery 100, and severe heat generation.

[0041] In one embodiment, reference Figure 1 , the volume of the battery assembly 1000 is V1, and the volume of the accommodation space is V2, satisfying: V1 / V2≥40%.

[0042] Specifically, the storage space needs to be equipped with space for personnel to install and repair, as well as space for power distribution and other structures, which reduces the space left for the battery assembly 1000. The current conventional solution is usually to first assemble multiple batteries 100 into battery 100 modules, and then install the multiple battery 100 modules into battery boxes and battery racks, that is, battery boxes, battery racks and other structures are required in the storage space, resulting in a reduction in the volume of the storage space that can be used to install batteries 100.

[0043] In this embodiment, structures such as a battery box and a battery rack are eliminated, and a battery assembly 1000 formed by a plurality of batteries 100 is directly installed in the storage space, thereby maximizing the use of limited space.

[0044] V1 / V2 may be 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc., without limitation. It should be understood that V1 / V2<100%.

[0045] In conventional energy storage devices, the volume of the battery assembly 1000 (excluding the battery box and battery rack) usually does not exceed 40% of the volume of the box body 300 of the energy storage device, and is usually around 30%, or even less than 25%.

[0046] It can be seen that the battery 100 device of the embodiment of the utility model adopts a new battery assembly 1000 design, which can maximize the use of the space of the box 300, avoid space waste, improve the space utilization rate of the battery 100 device, and help to improve the power capacity of the battery 100 device.

[0047] The embodiment of the utility model further provides an electrical equipment, including an electrical device and the energy storage device in the embodiment of the utility model, wherein the energy storage device supplies power to the electrical device.

[0048] The power consumption device may be industrial power load, commercial power load, household power load, etc., and may be a power grid, a base station, household appliances, etc., without limitation. The energy storage device of the utility model embodiment may be used to counter-cyclically adjust the peak and valley of power consumption to provide users with a cheaper, more stable and reliable power supply.

[0049] The battery 100 according to the embodiment of the utility model is described in detail below.

[0050] refer to Figure 2 and Figure 3 The embodiment of the utility model provides a battery 100, including a battery cell 10, a tab and a pole.

[0051] The battery cell 10 can be wound or stacked, etc., without limitation. The battery cell 10 includes a positive electrode sheet, a negative electrode sheet, a separator, etc. The positive electrode sheet includes a positive electrode collector and a positive electrode active layer arranged on the positive electrode collector, the negative electrode sheet includes a negative electrode collector and a negative electrode active layer arranged on the negative electrode collector, and the separator is arranged between the positive electrode sheet and the negative electrode sheet. For relevant details, please refer to the relevant technology. The battery cell 10 can be a bare battery cell 10 without a shell 40, or it can be accommodated in a shell 40, without limitation. The planar shape of the battery cell 10 can be roughly rectangular. The following text will take a rectangle as an example for explanation. It can be understood that the planar shape of the battery cell 10 can also be other shapes, without limitation.

[0052] The pole lugs are connected to the battery cell 10, and the poles are connected to the pole lugs. Among them, the pole lugs include positive pole lugs 21 and negative pole lugs 22, and the poles include positive pole posts 31 and negative pole posts 32. Both the positive pole lugs 21 and negative pole lugs 22 are connected to the battery cell 10, the positive pole post 31 is connected to the positive pole lug 21, and the negative pole post 32 is connected to the negative pole lug 22. The above-mentioned connection methods can specifically be welding, gluing, plugging, clamping, etc., without limitation. The pole lugs and pole posts are both made of metal materials, such as copper, aluminum, etc., without limitation. Optionally, the positive pole lug 21 and the negative pole lug 22 are respectively connected to the opposite sides of the battery cell 10, which can be in the length direction or the width direction. Alternatively, the positive pole lug 21 and the negative pole lug 22 are connected to the adjacent two sides of the battery cell 10. Alternatively, the positive pole lug 21 and the negative pole lug 22 can also be connected to the same side of the battery cell 10, without limitation. As Figure 3The embodiment in which the positive electrode tab 21 and the negative electrode tab 22 are respectively connected to opposite sides of the battery cell 10 is shown. The positive electrode column 31 and the negative electrode column 32 are respectively provided for the positive electrode tab 21 and the negative electrode tab 22, and will not be described in detail.

[0053] Optionally, the pole and the lug are directly connected. Alternatively, an adapter plate may be provided between the pole and the lug to achieve connection between the pole and the lug through the adapter plate.

[0054] Among them, the number of pole ears is P, the number of poles is N, and the following conditions are satisfied: P≠N, P and N are both positive integers not less than 2, and at least one of P and N is greater than 2.

[0055] The number of tabs is the sum of the number of positive tabs 21 and the number of negative tabs 22. To form a current loop, the battery cell 10 must be connected to at least one positive tab 21 and at least one negative tab 22, that is, the sum of the number of positive tabs 21 and negative tabs 22 is at least 2, that is, P is a positive integer not less than 2.

[0056] The number of poles is the sum of the number of positive poles 31 and the number of negative poles 32. To form a current loop, there must be at least one positive pole 31 and one negative pole 32, that is, the sum of the number of positive poles 31 and the number of negative poles 32 is at least 2, that is, N is a positive integer not less than 2.

[0057] The value of P can be 2, 3, 4, etc., and the value of N can also be 2, 3, 4, etc. It should be understood that the values ​​of P and N cannot both be 2, but can both be positive integers greater than 2.

[0058] At present, conventional power batteries 100 usually adopt a solution of 2 tabs and 2 poles, that is, 1 positive tab 21, 1 negative tab 22, 1 positive pole 31 and 1 negative pole 32. This is because the power battery 100 is small in size and capacity, and can also meet the requirements of energy density, discharge rate and discharge temperature rise. However, the energy storage battery 100 improved from the power battery 100 has a larger size and capacity. If the solution of 2 tabs and 2 poles is adopted, the impedance of the battery 100 will be very large, and the battery 100 will be severely polarized and generate heat during discharge, which affects the service life and safety performance of the battery 100.

[0059] The solution adopted in the embodiment of the utility model is P pole tabs and N pole posts, P≠N, and P and N are both positive integers not less than 2. Compared with the existing design of 2 pole tabs and 2 pole posts, the number of at least one of the pole tabs and the pole posts is increased, which can enable the battery cell 10 to have multiple discharge positions, thereby shortening the path length of the current inside the battery cell 10, and reducing the impedance of the battery 100.

[0060] Therefore, the battery 100 of the embodiment of the utility model, by setting the number of pole ears to P and the number of pole columns to N, satisfies: P≠N, P and N are both positive integers not less than 2, and at least one of P and N is greater than 2, which can reduce the impedance of the battery 100, solve the problem of severe polarization and heat generation during discharge of the battery 100, which affects the service life and safety performance of the battery 100, and at the same time, avoid the path of the current introduced into the pole column through the pole ear being too long, resulting in increased resistance, and ensure the process yield.

[0061] Optionally, it also satisfies: 0.25≤P / N≤5, and the specific value of P / N can be 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc., without limitation. The embodiment of the utility model also limits 0.25≤P / N≤5. Within this range, it can not only meet the requirement of reducing the impedance of the battery 100, but also avoid the increase of resistance caused by the long path of the current introduced into the pole through the pole ear, and ensure the process yield. If P / N<0.25, a single pole ear is connected to too many poles, resulting in a decrease in process yield and an increase in scrap rate. If P / N>5, there are too many pole ears or too few poles. When the number of pole ears is too large, multiple welding processes are required, which is easy to cause a decrease in process yield and an increase in scrap rate. When the number of poles is too small, the path of the current introduced into the pole through the pole ear is too long, and the resistance increases.

[0062] In one embodiment, reference Figure 3 , the number of positive electrode ears 21 is P1, the number of positive electrode columns 31 is N1, the number of negative electrode ears 22 is P2, and the number of negative electrode columns 32 is N2, satisfying:

[0063] 0.25≤P1 / N1≤5, 0.25≤P2 / N2≤5, P1, N1, P2, N2 are all positive integers, and at least one of P1, N1, P2, N2 is greater than 1.

[0064] The value of P1 can be 1, 2, 3, 4, etc., and the value of N1 can also be 1, 2, 3, 4, etc. The value of P2 can be 1, 2, 3, 4, etc., and the value of N2 can also be 1, 2, 3, 4, etc. It should be understood that the values ​​of P1, N1, P2, and N2 cannot all be 1, but three of them can be 1, for example, P1, P2, and N1 are 1, and N2 is greater than 1. When any one of P1, P2, N1, and N2 is multiple, a tab group or a pole group can be formed, each tab group has multiple tabs, each pole group has multiple poles, and each tab in the tab group can be electrically connected, and each pole in the pole group can be electrically connected. For example, if P1, P2, N1, and N2 are all multiple, a positive tab group, a positive pole group, a negative tab group, and a negative pole group can be formed.

[0065] The value of P1 / N1 can be 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc., without limitation. The value of P2 / N2 can be 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc., without limitation.

[0066] Similar to the aforementioned situation that all the pole ears and all the pole posts satisfy 0.25≤P / N≤5, the positive pole ear 21 and the positive pole post 31 are set to satisfy 0.25≤P1 / N1≤5, and the negative pole ear 22 and the negative pole post 32 are set to satisfy 0.25≤P2 / N2≤5. This can reduce the impedance of the battery 100 on both the positive side (i.e., the positive pole ear 21 and the positive pole post 31, the same below) and the negative side (i.e., the negative pole ear 22 and the negative pole post 32, the same below), solve the problem of severe polarization and heat generation during discharge of the battery 100, which affects the service life and safety performance of the battery 100. At the same time, it can avoid the path of the current introduced into the pole post through the pole ear being too long, resulting in increased resistance, and ensure the process yield.

[0067] Optionally, the battery 100 of the embodiment of the utility model further satisfies: 2≤N1≤20, 2≤N2≤20.

[0068] The specific values ​​of N1 and N2 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, etc. Such a number of positive poles 31 and negative poles 32 can be appropriately distributed so that the current flow path is as short as possible to reduce impedance. If N1 and N2 are greater than 20, the number of positive poles 31 and negative poles 32 is large, the number of welding with positive ear 21, negative ear 22 and end cover increases, the risk of corrosion at the welding point and the risk of poor welding rate increase, and corrosion and poor welding cause the contact impedance of the battery to increase as it cycles.

[0069] For example, Figure 3 An embodiment is shown in which P and N are both 10, and P1, N1, P2, and N2 are all 5, then P / N=1, P1 / N1=1, and P2 / N2=1.

[0070] For example, Figure 4 An embodiment is shown in which P is 4, N is 8, P1 and P2 are both 2, and N1 and N2 are both 4, then P / N=0.5, P1 / N1=0.5, and P2 / N2=0.5.

[0071] For example, Figure 5 An embodiment is shown in which P is 10, N is 2, P1 and P2 are both 5, and N1 and N2 are both 1, then P / N=5, P1 / N1=5, and P2 / N2=5.

[0072] refer to Figure 3, taking the planar shape of the battery cell 10 as a rectangle as an example, one side of the width direction of the battery cell 10 is connected to the positive pole ear 21, and the other opposite side is connected to the negative pole ear 22. For P1=1 and P2=1, the positive pole ear 21 and the negative pole ear 22 can be located in the middle of the length direction of the battery cell 10, and can roughly divide the battery cell 10 into two equal sections along the length direction; for P1>1, P2>1, and P1=P2, multiple pole ears are arranged at intervals along the length direction of the battery cell 10 and roughly divide the battery cell 10 into N+1 equal sections along the length direction. For other numbers of positive pole ears 21 and negative pole ears 22, the battery cell 10 is divided into multiple equal sections along the length direction on the corresponding positive side or negative side. In this way, it can be achieved that the distance from different positions of the battery cell 10 in the length direction to the pole ear is not too far, which can avoid uneven current distribution inside the battery 100 and cause lithium deposition. For the case of P<N, with Figure 4 For example, a single tab is connected to multiple poles, and the multiple poles are also spaced apart along the length direction of the battery cell 10 and roughly divide the tab. Figure 5 For example, if multiple tabs are connected to the same pole, the multiple tabs evenly divide the pole.

[0073] It should be understood that there may be any other feasible embodiments for the number and arrangement of the pole ears and poles, which will not be described in detail in the embodiments of the utility model.

[0074] In one embodiment, reference Figure 3 The energy of the battery cell 10 is E, and also satisfies: 1600Wh / piece ≤ E / N1 ≤ 4000Wh / piece.

[0075] The specific value of E / N1 can be 1600Wh / piece, 2000Wh / piece, 2500Wh / piece, 3000Wh / piece, 3500Wh / piece, 4000Wh / piece, etc., which will not be repeated here.

[0076] The battery 100 of the embodiment of the utility model is an energy storage battery, and the energy of its battery cell 10 is relatively large. The embodiment of the utility model is provided with a reasonable number of positive poles 31, and meets 1600Wh / piece ≤ E / N1 ≤ 4000Wh / piece, which can meet the requirements of reducing resistance and heat generation, and at the same time ensure that the structure of the positive pole 31 is stable and not easy to deform, and avoid electrolyte leakage and thermal runaway. If E / N1 < 1600Wh / piece, the number of positive poles 31 is too large or the energy of the battery cell 10 is small, and the role of each positive pole 31 cannot be fully utilized, and the positive pole 31 is wasted. If E / N1 > 4000Wh / piece, the heat generation at the positive pole 31 is large, the resistance increases, or the pole is easily deformed due to long-term high-temperature injection molding, resulting in electrolyte leakage, and large-capacity batteries are prone to thermal runaway.

[0077] Optionally, 1600Wh / unit ≤ E / N2 ≤ 4000Wh / unit is also satisfied. Similar to E / N1, it can meet the requirements of reducing resistance and heat generation, while ensuring that the structure of the negative electrode column 32 is stable and not easily deformed, and avoiding thermal runaway caused by electrolyte leakage.

[0078] In one embodiment, reference Figure 2 and Figure 3 The length of the battery 100 is L, the width is D, and the thickness is H, satisfying: 1000mm≤L≤5800mm, 400mm≤D≤2500mm, 7mm≤H≤150mm.

[0079] The specific value of L can be 1000mm, 1500mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm, 5500mm, 5800mm, etc. without restriction.

[0080] The specific value of H can be 400mm, 800mm, 1000mm, 1200mm, 1500mm, 1800mm, 2000mm, 2200mm, 2500mm, etc. without limitation.

[0081] The specific value of H can be 7mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, etc., without restriction.

[0082] The battery 100 is roughly in the shape of a cuboid, and the values ​​of its length L and width D are obviously much larger than the thickness H. The battery 100 is of ultra-large and ultra-thin size, and multiple batteries 100 are stacked along the thickness direction to form a battery cell 10 assembly.

[0083] When the size of the battery 100 reaches 1000 mm or above, the problem of uneven temperature rise of the tab and uneven current density distribution becomes more prominent. Therefore, the problem of uneven current distribution in the length and width directions of the battery 100 can be effectively improved by applying a solution in which the number of at least one of the tabs and poles is greater than 2 in the utility model.

[0084] Optionally, the battery 100 also satisfies: 1.5≤L / D≤14.5.

[0085] The value of L / D can specifically be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, etc., without limitation.

[0086] The length L of the battery 100 is larger than the width D, and satisfies 1.5≤L / D≤14.5, which can improve the current density problem, without wasting poles, and the cost is low. If L / D<1.5, the length and width of the battery 100 are not much different, and the current density improvement effect is not good. If L / D>14.5, the aspect ratio is too large, the multi-pole design effect is not obvious, the poles are wasted, and the cost increases.

[0087] In one embodiment, reference Figures 3 to 5 The lengths of the positive electrode column 31 and the negative electrode column 32 are both a, satisfying: 30mm≤a≤2000mm, N1·a≤L, N2·a≤L.

[0088] Taking the planar shape of the battery cell 10 as a rectangle as an example, a positive electrode column 31 is set on one side of the width direction of the battery cell 10, and a negative electrode column 32 is set on the other opposite side. The lengths of the positive electrode column 31 and the negative electrode column 32 are both dimensions along the length direction of the battery cell 10, and the heights are both dimensions along the width direction of the battery cell 10.

[0089] The value of a can be 30mm, 50mm, 100mm, 300mm, 500mm, 800mm, 1000mm, 1500mm, 2000mm, etc. without limitation.

[0090] Satisfying N1·a≤L, N2·a≤L, the overall length of the positive electrode column 31 (i.e., N1·a) and the overall length of the negative electrode column 32 (i.e., N2·a) do not exceed the length L of the battery 100, ensuring that the electrode column does not exceed the outer edge of the length of the battery 100 to facilitate installation to form the battery 100.

[0091] Optionally, the heights of the positive pole 31 and the negative pole 32 are both b, satisfying: 3 mm ≤ b ≤ 20 mm.

[0092] The value of b can specifically be 3mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc., without limitation.

[0093] Satisfying: 3mm≤b≤20mm, on the basis of satisfying the electrical connection tab, the height of the pole is relatively low, so that the width of the battery cell 10 in the battery 100 can be made as large as possible to increase the capacity.

[0094] In one embodiment, reference Figure 3 The battery 100 also includes a shell 40 and an explosion-proof valve 50. The battery cell 10 is accommodated in the shell 40. The pole is connected to the shell 40 and exposed outside the shell 40. The pole is arranged on the same side or different sides of the shell 40. The explosion-proof valve 50 is arranged in the shell 40 and can be located on the same side or different sides of the shell 40 with the pole. The number of explosion-proof valves 50 is F, satisfying: F is a positive integer and F≥2.

[0095] Among them, taking the battery 100 as a rectangular parallelepiped as an example, the shell 40 is roughly in the shape of a rectangular parallelepiped, and has a chamber inside to accommodate the battery cell 10, the pole ear and other structures. One end of the pole is connected to the pole ear, and the other end passes through the shell 40. An insulation and sealing structure can be set between the pole and the shell 40 without restriction. There is no restriction on the specific structure of the explosion-proof valve 50. The explosion-proof valve 50 can be set at any position of the shell 40 of the battery 100, such as on the edge in the length direction or the width direction, and multiple explosion-proof valves 50 can be set on the same side or different sides of the battery 100 without restriction.

[0096] The value of F can be 2, 3, 4, etc., without limitation.

[0097] The energy storage battery 100 is relatively large in size and is provided with a plurality of explosion-proof valves 50 , which can discharge the high-pressure gas in the shell 40 at a plurality of positions, so as to avoid accidents such as fire and explosion caused by poor gas discharge in the shell 40 of the battery 100 .

[0098] The housing 40 of the battery 100 may further include a liquid injection hole 60 for injecting electrolyte into the housing 40. The battery 100 may further include other structures, which will not be described in detail in the embodiment of the utility model.

[0099] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0100] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A battery, characterized in that: include: Battery cells; A tab connected to the battery cell; A pole connected to the pole lug; Among them, the number of the pole ears is P, the number of the poles is N, and the following conditions are satisfied: P≠N, P and N are both positive integers not less than 2, and at least one of P and N is greater than 2.

2. The battery according to claim 1, characterized in that Also satisfies: 0.25≤P / N≤5.

3. The battery according to claim 2, characterized in that The electrode tabs include positive electrode tabs and negative electrode tabs, the electrode posts include positive electrode posts and negative electrode posts, the positive electrode tabs and the negative electrode tabs are both connected to the battery cell, the positive electrode posts are connected to the positive electrode tabs, the negative electrode posts are connected to the negative electrode tabs, the number of the positive electrode tabs is P1, the number of the positive electrode posts is N1, the number of the negative electrode tabs is P2, and the number of the negative electrode posts is N2, satisfying: 0.25≤P1 / N1≤5, 0.25≤P2 / N2≤5, P1, N1, P2, N2 are all positive integers, and at least one of P1, N1, P2, N2 is greater than 1.

4. The battery according to claim 3, characterized in that It also satisfies: 2≤N1≤20, 2≤N2≤20.

5. The battery according to claim 3 or 4, characterized in that: The energy of the battery cell is E, and further satisfies: 1600Wh / cell≤E / N1≤4000Wh / cell, and / or, 1600Wh / cell≤E / N2≤4000Wh / cell.

6. The battery according to claim 3 or 4, characterized in that: The battery has a length of L, a width of D, and a thickness of H, satisfying: 1000mm≤L≤5800mm, 400mm≤D≤2500mm, and 7mm≤H≤150mm.

7. The battery according to claim 6, characterized in that Also meets: 1.5≤L / D≤14.

5.

8. The battery according to claim 6, characterized in that The lengths of the positive electrode column and the negative electrode column are both a, satisfying: 30mm≤a≤2000mm, N1·a≤L, N2·a≤L.

9. The battery according to claim 6, characterized in that The heights of the positive electrode column and the negative electrode column are both b, satisfying: 3mm≤b≤20mm.

10. The battery according to any one of claims 1 to 4, characterized in that: The battery also includes a shell and an explosion-proof valve, the battery cell is accommodated in the shell, the pole is connected to the shell and exposed outside the shell, and the pole is arranged on the same side or different sides of the shell, and the explosion-proof valve is arranged in the shell, wherein the number of the explosion-proof valves is F, satisfying: F is a positive integer and F≥2.

11. A battery assembly, characterized in that: The invention comprises a plurality of batteries according to any one of claims 1 to 10, wherein the plurality of batteries are arranged in sequence.

12. An energy storage device, characterized in that: It comprises a box body and the battery assembly as claimed in claim 11, wherein the box body encloses a receiving space, and the battery assembly is received in the receiving space.

13. The energy storage device according to claim 12, characterized in that: The volume of the battery assembly is V1, and the volume of the accommodating space is V2, satisfying: V1 / V2≥40%.

14. An electrical device, characterized in that: It comprises an electric device and an energy storage device as claimed in claim 12 or 13, wherein the energy storage device supplies power to the electric device.

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