Battery, energy storage device and electric equipment

Abstract

The utility model provides a battery, an energy storage device and electric equipment. The battery comprises a shell, a battery cell unit and a limiting structure, the shell comprises a top cover and a bottom cover which are opposite to each other, and at least one of the top cover and the bottom cover is provided with a pole. The battery cell unit comprises at least one battery cell. The battery cell comprises a pole piece. The battery cell unit comprises a first surface opposite to the top cover, a second surface opposite to the bottom cover, and a peripheral side surface connected with the first surface and the second surface; the battery cell unit further comprises a first end located on the side where the first face is located and a second end located on the side where the second face is located. The limiting structure is mounted at the first end and / or the second end, and is used for at least limiting the pole piece at the first end from deforming towards the peripheral side surface and / or limiting the pole piece at the second end from deforming towards the peripheral side surface.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, an energy storage device and an electrical equipment. Background Art

[0002] Batteries are widely used as the main power source for electrical devices due to their recyclable properties. As the demand for batteries increases, people's requirements for their performance in all aspects are also getting higher and higher, and the stable operation of batteries is particularly critical.

[0003] However, when the battery is vibrated or squeezed, the pole pieces in the battery cell will be misaligned in different directions, and when the battery is charged and discharged, the pole pieces in the battery cell will expand in different directions. If the battery cell is encapsulated with plastic, although the misalignment of the pole pieces in different directions can be limited, the expansion degree of the pole pieces in different directions will be inconsistent, resulting in wrinkles on the pole pieces. Summary of the invention

[0004] In view of the above problems, the present application provides a battery, an energy storage device and an electrical equipment.

[0005] In a first aspect, the present application provides a battery. The battery includes a shell, a battery cell unit and a limiting structure. The shell includes a top cover and a bottom cover facing each other, and at least one of the top cover and the bottom cover is equipped with a pole. The battery cell unit includes at least one battery cell. The battery cell includes a pole piece. The battery cell unit includes a first surface opposite to the top cover, a second surface opposite to the bottom cover, and a peripheral side surface connected to the first surface and the second surface. The battery cell unit also includes a first end located on the side where the first surface is located and a second end located on the side where the second surface is located. The limiting structure is installed at the first end and / or the second end, and is used to at least limit the pole piece at the first end from deforming toward the peripheral side surface and / or limit the pole piece at the second end from deforming toward the peripheral side surface.

[0006] In the above technical solution, the limiting structure can clamp the first end and / or the second end of the battery cell unit, so as to fix the edge of the electrode sheet, and then fix the spacing between the electrode sheets during the battery cycle. When the battery is vibrated or squeezed, the limiting structure can limit the misalignment of the electrode sheet, that is, limit the deformation of the electrode sheet in the length direction and width direction of the battery cell unit (that is, the spacing between adjacent electrode sheets), which can avoid wrinkles on the surface of the electrode sheet due to uneven expansion, thereby ensuring the battery cycle life and safety performance.

[0007] As an optional technical solution of the present application, the limiting structure includes a bottom wall and a side wall extending from the periphery of the bottom wall. The bottom wall and the side wall together enclose a limiting cavity, and the first end is accommodated in the limiting cavity. The peripheral side surface of the battery cell unit is in contact with the side wall.

[0008] In the above technical solution, the first end is accommodated in the limiting cavity, so that the side wall can limit the deformation of the first end of the battery cell unit in the length direction and width direction of the battery cell unit. When the battery cell unit squeezes the side wall during expansion, the peripheral side surface of the battery cell unit fits with the side wall, so that the battery cell is evenly stressed, stress concentration is reduced, and damage to the battery cell unit is avoided.

[0009] As an optional technical solution of the present application, the limiting structure includes a bottom wall and a side wall extending from the periphery of the bottom wall. The bottom wall and the side wall together enclose a limiting cavity, and the second end is accommodated in the limiting cavity. The peripheral side surface of the battery cell unit is in contact with the side wall.

[0010] In the above technical solution, the second end is accommodated in the limiting cavity, so that the side wall can limit the deformation of the second end of the battery cell unit in the length direction and width direction of the battery cell unit. When the battery cell unit squeezes the side wall during expansion, the peripheral side surface of the battery cell unit fits with the side wall, so that the battery cell is evenly stressed, stress concentration is reduced, and damage to the battery cell unit is avoided.

[0011] As an optional technical solution of the present application, at least one first through hole is provided on the bottom wall.

[0012] In the above technical solution, the electrolyte inside the shell can pass through the first through hole and infiltrate the battery cell unit, thereby improving the infiltration performance of the electrolyte in the battery cell unit on the electrode sheet. In addition, the first through hole can reduce the weight and volume of the restriction structure, which can reduce the weight of the battery on the one hand, and reserve more space for the electrolyte on the other hand. While retaining the function of the restriction structure, the battery can accommodate more electrolyte, so that the electrolyte can fully infiltrate the electrode sheet.

[0013] As an optional technical solution of the present application, the bottom wall is provided with a plurality of first through holes, the plurality of first through holes are spaced apart from each other, and a reinforcing rib is formed between two adjacent first through holes, and the opposite ends of the reinforcing rib are connected to the side walls.

[0014] In the above technical solution, the multiple first through holes can allow the electrolyte to infiltrate multiple areas of the battery cell unit, so that the electrolyte can infiltrate multiple areas of the battery cell unit more evenly. The opposite ends of the reinforcing rib are connected to the side wall, which can limit the deformation of the side wall in the width direction of the battery cell unit, thereby enhancing the limiting effect of the side wall of the limiting structure on the expansion and deformation of the pole piece.

[0015] As an optional technical solution of the present application, the reinforcing rib is provided with at least one second through hole penetrating therethrough, and the total flow area of ​​at least one of the second through holes is smaller than the total flow area of ​​the plurality of the first through holes.

[0016] In the above technical solution, the electrolyte can pass through the second through hole and infiltrate the battery cell unit, thereby improving the electrolyte's wetting performance on the electrode sheet. In addition, the second through hole can reduce the weight and volume of the reinforcing rib, which can reduce the weight of the battery on the one hand, and reserve more space for the electrolyte on the other hand. The total flow area of ​​at least one second through hole is smaller than the total flow area of ​​multiple first through holes, which can ensure that the reinforcing rib has sufficient strength and allow the battery to accommodate more electrolyte.

[0017] As an optional technical solution of the present application, the flow area of ​​the second through hole is smaller than the flow area of ​​the first through hole.

[0018] In the above technical solution, the flow area of ​​the second through hole is smaller than the flow area of ​​the first through hole, which can reduce the amount of material that needs to be removed during the manufacturing process of the reinforcing rib and maintain the overall structural integrity of the reinforcing rib.

[0019] As an optional technical solution of the present application, the bottom wall is provided with a plurality of first through holes, and the side wall is provided with at least one third through hole, and the total flow area of ​​at least one third through hole is smaller than the total flow area of ​​the plurality of first through holes.

[0020] In the above technical solution, the electrolyte can pass through the third through hole and infiltrate the battery cell unit, thereby improving the electrolyte's wetting performance on the electrode sheet. In addition, the third through hole can reduce the weight and volume of the side wall, which can reduce the weight of the battery on the one hand, and reserve more space for the electrolyte on the other hand. The total flow area of ​​at least one third through hole is smaller than the total flow area of ​​multiple first through holes, which can ensure that the side wall has sufficient strength and allow the battery to accommodate more electrolyte.

[0021] As an optional technical solution of the present application, the flow area of ​​the third through hole is smaller than the flow area of ​​the first through hole.

[0022] In the above technical solution, the electrolyte can pass through the third through hole and infiltrate the battery cell unit, thereby improving the electrolyte's wetting performance on the electrode sheet. In addition, the third through hole can reduce the weight and volume of the side wall, which can reduce the weight of the battery on the one hand, and reserve more space for the electrolyte on the other hand. The flow area of ​​the third through hole is smaller than the flow area of ​​the first through hole, which can ensure that the side wall has sufficient strength and allow the battery to accommodate more electrolyte.

[0023] As an optional technical solution of the present application, the battery is a cylindrical battery, the outer contour of the cross section of the battery cell unit is circular, and the outer contour of the cross section of the side wall is circular.

[0024] In the above technical solution, the outer contour of the cross section of the side wall is circular, which enables the limiting structure to be suitable for cylindrical batteries.

[0025] As an optional technical solution of the present application, the battery is a square battery, the outer contour of the cross section of the battery cell unit is square, and the outer contour of the cross section of the side wall is square.

[0026] In the above technical solution, the outer contour of the cross section of the side wall is square, which enables the limiting structure to be suitable for square batteries.

[0027] As an optional technical solution of the present application, the side wall includes a first side wall, a second side wall, a third side wall and a fourth side wall connected in sequence. The peripheral side surface includes a first peripheral side surface, a second peripheral side surface, a third peripheral side surface and a fourth peripheral side surface connected in sequence. The first side wall is bonded to the first peripheral side surface, the second side wall is bonded to the second peripheral side surface, the third side wall is bonded to the third peripheral side surface, the fourth side wall is bonded to the fourth peripheral side surface, and the bottom wall is bonded to the first surface and / or the second surface.

[0028] In the above technical solution, the first side wall is in contact with the first peripheral side surface, and the third side wall is in contact with the third peripheral side surface, so that the first side wall and the third side wall can limit the misalignment of the battery cell unit in the width direction of the battery cell unit, the second side wall is in contact with the second peripheral side surface, and the fourth side wall is in contact with the fourth peripheral side surface, so that the second side wall and the fourth side wall can limit the misalignment of the battery cell unit in the length direction of the battery cell unit. The bottom wall is in contact with the first surface and / or the second surface, so that the battery cell unit can expand uniformly in the height direction of the battery cell unit.

[0029] As an optional technical solution of the present application, the bottom wall is provided with a plurality of first through holes arranged in sequence in the length direction, and a first support portion and a second support portion are formed at both ends of the bottom wall in the length direction, and a reinforcing rib is formed between two adjacent first through holes. The three sides of the first support portion are respectively connected to the first side wall, the second side wall and the third side wall, the three sides of the second support portion are respectively connected to the first side wall, the fourth side wall and the third side wall, and the opposite ends of the reinforcing rib are respectively connected to the first side wall and the third side wall. The size of the first support portion in the length direction of the bottom wall is not less than the height of each of the side walls.

[0030] In the above technical solution, the first support part and the second support part can limit the battery cell in the height direction of the battery cell, so as to reduce the deformation of the battery cell and the misalignment between the pole pieces when the battery vibrates, reduce the shaking amplitude of the battery cell in the height direction of the battery cell, and improve the performance and safety of the battery cell. The three sides of the first support part are respectively connected to the first side wall, the second side wall and the third side wall, which can enhance the stability of the first side wall, the second side wall and the third side wall, and improve the connection strength of the first side wall, the second side wall and the third side wall; the three sides of the second support part are respectively connected to the first side wall, the fourth side wall and the third side wall, which can enhance the connection strength of the first side wall, the fourth side wall and the third side wall, and improve the stability of the first side wall, the fourth side wall and the third side wall. The size of the first support part in the length direction of the bottom wall is not less than the height of each side wall, which can further limit the deformation of the first side wall and the third side wall in the width direction of the battery cell.

[0031] As an optional technical solution of the present application, a dimension of the second supporting portion in the length direction of the bottom wall is not less than a height of each of the side walls.

[0032] In the above technical solution, the dimension of the second support portion in the length direction of the bottom wall is not less than the height of each side wall, which can further limit the deformation of the first side wall and the third side wall in the width direction of the battery cell unit.

[0033] In a second aspect, the present application provides an energy storage device, which includes the battery described in any one of the embodiments.

[0034] In the above technical solution, the limiting structure of the battery can clamp the first end and / or the second end of the battery cell unit, so as to fix the edge of the electrode sheet, and then fix the spacing between the electrode sheets during the battery cycle. When the battery is vibrated or squeezed, the limiting structure can limit the misalignment of the electrode sheet, that is, limit the deformation of the electrode sheet in the length direction and width direction of the battery cell unit (that is, the spacing between adjacent electrode sheets), which can avoid wrinkles on the surface of the electrode sheet due to uneven expansion, thereby ensuring the battery cycle life and safety performance.

[0035] In a third aspect, the present application provides an electrical device, which includes the energy storage device of the above embodiment.

[0036] In the above technical solution, the limiting structure of the battery of the energy storage device can clamp the first end and / or the second end of the battery cell unit, so as to fix the edge of the electrode sheet, and then fix the spacing between the electrode sheets during the battery cycle. When the battery is vibrated or squeezed, the limiting structure can limit the misalignment of the electrode sheet, that is, limit the deformation of the electrode sheet in the length direction and width direction of the battery cell unit (that is, the spacing between adjacent electrode sheets), which can avoid wrinkles on the surface of the electrode sheet due to uneven expansion, thereby ensuring the battery cycle life and safety performance.

[0037] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0039] Figure 1 A schematic diagram of a three-dimensional assembly of a battery according to some embodiments of the present application;

[0040] Figure 2 for Figure 1 A three-dimensional exploded schematic diagram of a partial structure of a battery shown;

[0041] Figure 3 for Figure 1 A three-dimensional schematic diagram of a partial structure of a battery shown;

[0042] Figure 4 A schematic diagram of the three-dimensional structure of an energy storage device according to some embodiments of the present application;

[0043] Figure 5 This is a schematic diagram of the planar structure of electrical equipment in some implementation modes of the present application.

[0044] Description of main component symbols:

[0045] Electrical equipment 1000; energy storage device 100;

[0046] Battery 10; housing 11; top cover 111; bottom cover 113; pole 115; housing 117;

[0047] Battery cell unit 13; battery cell 131; pole piece 1311; first surface 1312; second surface 1313; peripheral side surface 1315; first peripheral side surface 13151; second peripheral side surface 13153; third peripheral side surface 13155; fourth peripheral side surface 13157; first end 1317; second end 1318; limiting structure 15; bottom wall 151; first through hole 1511; reinforcing rib 1513; second through hole 15131; first support portion 1515; second support portion 1517; side wall 153; third through hole 1531; first side wall 1533; second side wall 1535; third side wall 1537; fourth side wall 1539; limiting cavity 155;

[0048] Battery box 30; box body 31; cover body 33. DETAILED DESCRIPTION

[0049] The following detailed description of the implementation of the technical solution of the present application is provided in conjunction with the accompanying drawings. The following implementation is only used to more clearly illustrate the technical solution of the present application, and is therefore only used as an example, and cannot be used to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0051] In the description of the implementation methods of this application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the implementation methods of this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0052] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "liquid level", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application 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 should not be understood as a limitation on the embodiments of the present application.

[0056] In the description of the implementation methods of the present application, unless otherwise clearly stipulated and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements.

[0057] See also Figure 1 , Figure 2 and Figure 3 The present application provides a battery 10. The battery 10 includes a shell 11, a battery cell unit 13 and a limiting structure 15. The shell 11 includes a top cover 111 and a bottom cover 113 facing each other, and at least one of the top cover 111 and the bottom cover 113 is equipped with a pole 115. The battery cell unit 13 includes at least one battery cell 131. The battery cell 131 includes a pole piece 1311. The battery cell unit 13 includes a first surface 1312 opposite to the top cover 111, a second surface 1313 opposite to the bottom cover 113, and a peripheral side surface 1315 connected to the first surface 1312 and the second surface 1313. The battery cell unit 13 also includes a first end 1317 located on the side where the first surface 1312 is located and a second end 1318 located on the side where the second surface 1313 is located. The limiting structure 15 is installed at the first end 1317 and / or the second end 1318 and is used to at least limit the pole piece 1311 at the first end 1317 from deforming toward the peripheral side surface 1315 and / or limit the pole piece 1311 at the second end 1318 from deforming toward the peripheral side surface 1315 .

[0058] Specifically, the shell 11 is a structure with a cavity, and the interior includes a cavity for accommodating the battery cell 13 and the electrolyte. The shape of the shell 11 can be determined according to the shape of the battery cell 13, that is, the shell 11 can be a cylinder, a cuboid, a polyhedron, or a cone. For example, if the battery cell 13 is a cylindrical structure, the corresponding shell 11 can be a cylindrical structure; if the battery cell 13 is a cuboid structure, the corresponding shell 11 can be a cuboid structure. The material of the shell 11 includes but is not limited to metal or non-metal, wherein metal includes aluminum, iron, steel, aluminum alloy or iron alloy, etc., and non-metal includes but is not limited to plastic, etc.

[0059] The housing 11 includes a top cover 111 and a bottom cover 113, and a housing 117 between the top cover 111 and the bottom cover 113. The housing 117 is provided with openings on both sides, and the top cover 111 and the bottom cover 113 cover the two openings respectively. In one example, the top cover 111 and the bottom cover 113 can be combined with the housing 117 in a detachable connection manner, and the detachable connection manner includes but is not limited to snap connection or threaded connection. In another example, the top cover 111 and the bottom cover 113 can be combined with the housing 117 in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding or welding. It can be understood that the housing 117 can be a one-side opening structure, that is, the top cover 111 can be integrally formed with the housing 117, and the bottom cover 113 covers the opening in a detachable connection manner or a non-detachable connection manner; or the bottom cover 113 can be integrally formed with the housing 117, and the top cover 111 covers the opening in a detachable connection manner or a non-detachable connection manner. The materials of the top cover 111 , the bottom cover 113 and the housing 117 may be the same, partially the same, or completely different.

[0060] The battery cell unit 13 is the core structure that performs energy storage and energy release functions inside the battery 10. The battery cell unit 13 is accommodated in the housing 11. The battery cell unit 13 may include one or more battery cells 131, which is not limited in this embodiment. The present application takes the battery cell unit 13 as an example to illustrate that it includes one battery cell 131. The battery cell 131 includes two types of pole sheets 1311, namely a positive pole sheet 1311 and a negative pole sheet 1311, and may also include structures such as a separator. The function of the separator is to physically separate the positive pole sheet 1311 and the negative pole sheet 1311 to prevent direct contact between the positive pole sheet 1311 and the negative pole sheet 1311. The battery cell 131 may be formed in a winding type, a stacked type or other manner. Multiple battery cells 131 are connected in series or in parallel to form a battery cell unit 13, and then are encapsulated in the housing 11 together with the electrolyte.

[0061] In this application, the length direction of the battery cell unit 13 is used as the first direction X, the width direction of the battery cell unit 13 is used as the second direction Y, and the height direction of the battery cell unit 13 is used as the third direction Z. The battery cell unit 13 includes a first surface 1312 and a second surface 1313 opposite to each other in the third direction Z, the first surface 1312 is close to the top cover 111, and the second surface 1313 is close to the bottom cover 113. Between the first surface 1312 and the second surface 1313 is the peripheral side surface 1315 of the battery cell unit 13, the first end 1317 is located on the side where the first surface 1312 is located, and the second end 1318 is located on the side where the second surface 1313 is located.

[0062] More specifically, during the battery charging process, the metal ions in the positive electrode sheet will detach and transfer to the negative electrode sheet. However, this process may encounter some problems. For example, the metal ions may be deposited on the surface of the negative electrode sheet to form a metal single substance, which will lead to reduced battery performance, reduced cycle life, and limit the battery's ability to charge quickly. Taking lithium-ion batteries as an example, lithium ions detach from the positive electrode sheet and embed into the negative electrode sheet during charging. However, if an abnormal situation occurs, for example, the space of the negative electrode sheet is not enough to embed lithium ions, or the resistance of lithium ions embedding into the negative electrode sheet is too large, or the lithium ions detach from the positive electrode sheet too quickly and cannot be embedded in the active material layer of the negative electrode sheet in equal amounts, then the unembedded lithium ions will obtain electrons on the surface of the negative electrode sheet to form a silvery-white lithium metal single substance, which is the so-called lithium precipitation phenomenon.

[0063] More commonly, since the battery cell is composed of materials such as positive electrode sheets, negative electrode sheets and separators through winding or lamination, when the battery is subjected to vibration or extrusion, the battery cell unit will shake and deform, and displacement or misalignment may occur between the positive electrode sheets, negative electrode sheets and separators, which will cause the metal ions to be unable to be smoothly embedded in the negative electrode sheets, thereby increasing the risk of metal ions precipitating on the negative electrode surface. Lithium precipitation will not only lead to the decline of lithium-ion battery performance and reduced cycle life, but also limit the battery's ability to charge quickly. In addition, when lithium precipitation occurs in the battery, the precipitated lithium metal is very active and can react with the electrolyte even at lower temperatures, resulting in a decrease in the starting temperature of the battery's self-heating and an increase in the self-heating rate, which seriously threatens the safety of the battery. More seriously, when the lithium precipitation phenomenon is serious, the lithium ions separated from the positive electrode sheet may form lithium crystals on the surface of the negative electrode sheet, and the lithium crystals may pierce the separator, causing the risk of short circuit between the positive and negative electrodes.

[0064] Therefore, the present application limits the displacement or misalignment that may occur between the positive electrode sheet 1311 , the negative electrode sheet 1311 and the isolation sheet by installing a limiting structure 15 at the first end 1317 and / or the second end 1318 of the battery cell unit 13 .

[0065] Specifically, there may be one limiting structure 15, one limiting structure 15 being installed at the first end 1317 or at the second end 1318; there may be two limiting structures 15, two limiting structures 15 being installed at the first end 1317 and the second end 1318, respectively. The limiting structure 15 may clamp the first end 1317 and / or the second end 1318 of the battery cell unit 13, thereby fixing the edge of the pole piece 1311, thereby limiting the pole piece 1311 at the first end 1317 from deforming toward the peripheral side surface 1315 and / or limiting the pole piece 1311 at the second end 1318 from deforming toward the peripheral side surface 1315. Not deforming toward the peripheral side surface 1315 means that the pole piece 1311 does not deform in the first direction X and the second direction Y, resulting in a change in the interval between adjacent pole pieces 1311. The limiting structure 15 is made of a material resistant to electrolyte, such as polypropylene, polyethylene terephthalate or other polymer materials.

[0066] In the above technical solution, the limiting structure 15 can clamp the first end 1317 and / or the second end 1318 of the battery cell unit 13, so as to fix the edge of the pole piece 1311, and then fix the spacing between the pole pieces 1311 during the cycle of the battery 10. When the battery 10 is vibrated or squeezed, the limiting structure 15 can limit the misalignment of the pole piece 1311, that is, limit the deformation of the pole piece 1311 in the first direction X and the second direction Y (that is, the spacing between adjacent pole pieces 1311), avoid the misalignment between the pole pieces 1311. The transmission path of the metal ions is increased, the problem of metal ion precipitation is reduced, and wrinkles on the surface of the pole piece 1311 caused by uneven expansion of the pole piece 1311 can be avoided, thereby ensuring the cycle life and safety performance of the battery 10.

[0067] See also Figure 2 and Figure 3 As an optional technical solution of the present application, the limiting structure 15 includes a bottom wall 151 and a side wall 153 extending from the periphery of the bottom wall 151. The bottom wall 151 and the side wall 153 together form a limiting cavity 155, and the first end 1317 is accommodated in the limiting cavity 155. The peripheral side surface 1315 of the battery cell unit 13 is in contact with the side wall 153.

[0068] Specifically, the bottom wall 151 is a structure in which the limiting structure 15 is disposed on the first surface 1312 of the battery cell unit 13. Further, the bottom wall 151 is parallel to the XY plane, and the side wall 153 surrounds the bottom wall 151 and is perpendicular to the XY plane. The bottom wall 151 and the side wall 153 can be integrally formed or separately formed.

[0069] In the above embodiment, the first end 1317 is accommodated in the limiting cavity 155, so that the side wall 153 can limit the deformation of the first end 1317 of the battery cell unit 13 in the first direction X and the second direction Y. When the battery cell unit 13 compresses the side wall 153 during expansion, the peripheral side surface 1315 of the battery cell unit 13 fits with the side wall 153, so that the battery cell 131 is subjected to uniform force, stress concentration is reduced, and damage to the battery cell unit 13 is avoided.

[0070] See also Figure 2 and Figure 3 As an optional technical solution of the present application, the limiting structure 15 includes a bottom wall 151 and a side wall 153 extending from the periphery of the bottom wall 151. The bottom wall 151 and the side wall 153 together form a limiting cavity 155, and the second end 1318 is accommodated in the limiting cavity 155. The peripheral side surface 1315 of the battery cell unit 13 is in contact with the side wall 153.

[0071] In the above embodiment, the second end 1318 is accommodated in the limiting cavity 155, so that the side wall 153 can limit the deformation of the second end 1318 of the battery cell unit 13 in the first direction X and the second direction Y. When the battery cell unit 13 compresses the side wall 153 during expansion, the peripheral side surface 1315 of the battery cell unit 13 fits with the side wall 153, so that the battery cell 131 is subjected to uniform force, stress concentration is reduced, and damage to the battery cell unit 13 is avoided.

[0072] See also Figure 2 and Figure 3 As an optional technical solution of the present application, at least one first through hole 1511 is provided on the bottom wall 151 .

[0073] Specifically, the first through hole 1511 penetrates the bottom wall 151 in the third direction Z. The first through hole 1511 may be one or more, which is not limited in the present application. The present application only shows an embodiment in which there are three first through holes 1511. The first through hole 1511 may be circular, square, track-shaped or other shapes. The present application only shows an embodiment in which the first through hole 1511 is rectangular.

[0074] In the above embodiment, the electrolyte inside the housing 11 can pass through the first through hole 1511 and infiltrate the battery cell unit 13, thereby improving the infiltration performance of the electrolyte in the battery cell unit 13 on the electrode piece 1311. In addition, the first through hole 1511 can reduce the weight and volume of the limiting structure 15, which can reduce the weight of the battery 10 on the one hand, and reserve more space for the electrolyte on the other hand. While retaining the function of the limiting structure 15, the battery 10 can accommodate more electrolyte, so that the electrolyte can fully infiltrate the electrode piece 1311.

[0075] See also Figure 2 and Figure 3As an optional technical solution of the present application, a plurality of first through holes 1511 are provided on the bottom wall 151, the plurality of first through holes 1511 are spaced apart from each other, and a reinforcing rib 1513 is formed between two adjacent first through holes 1511, and the opposite ends of the reinforcing rib 1513 are connected to the side wall 153.

[0076] Specifically, when the bottom wall 151 is provided with a plurality of first through holes 1511, the spacings between the plurality of first through holes 1511 may be consistent or inconsistent. This application only shows the case where the spacings between the three first through holes 1511 are the same. The plurality of first through holes 1511 may be arranged along the first direction X, or along the second direction Y, or in any other arrangement. A reinforcing rib 1513 is formed between two adjacent first through holes 1511, and the two ends of the reinforcing rib 1513 may extend along the first direction X and connect to the side wall 153, or the reinforcing rib 1513 may extend along the second direction Y and connect to the side wall 153. The reinforcing rib 1513 may be one or more. When there are a plurality of reinforcing ribs 1513, a plurality of reinforcing ribs 1513 extending along the first direction X and connecting to the side wall 153 and a plurality of reinforcing ribs 1513 extending along the second direction Y and connecting to the side wall 153 may cross to form the first through hole 1511.

[0077] In the above embodiment, the plurality of first through holes 1511 can allow the electrolyte to infiltrate the plurality of regions of the battery cell unit 13, so that the electrolyte can more evenly infiltrate the plurality of regions of the battery cell unit 13. The opposite ends of the reinforcing rib 1513 are connected to the side wall 153, which can improve the strength of the side wall 153 and limit the deformation of the side wall 153 in the second direction Y, thereby enhancing the limiting effect of the side wall 153 of the limiting structure 15 on the expansion and deformation of the pole piece 1311.

[0078] See also Figure 2 and Figure 3 As an optional technical solution of the present application, at least one second through hole 15131 is provided on the reinforcing rib 1513 , and the total flow area of ​​the at least one second through hole 15131 is smaller than the total flow area of ​​the plurality of first through holes 1511 .

[0079] Specifically, the second through hole 15131 penetrates the reinforcing rib 1513 in the third direction Z. The second through hole 15131 can be one, two, three or even more, which is not limited in the present application. The second through hole 15131 can be circular, square, runway-shaped or other shapes. The total flow area of ​​at least one second through hole 15131 is smaller than the total flow area of ​​the plurality of first through holes 1511, and the total flow area of ​​at least one second through hole 15131 can be 0.9 times, 0.89 times, 0.79 times, 0.65 times, 0.56 times, 0.45 times, 0.33 times, 0.23 times, or 0.11 times the total flow area of ​​the plurality of first through holes 1511. If the total flow area of ​​at least one second through hole 15131 is greater than or equal to the total flow area of ​​multiple first through holes 1511, the strength of the reinforcing rib 1513 will be reduced, thereby weakening the strength between the reinforcing rib 1513 and the side wall 153, causing the reinforcing rib 1513 to break easily and the reinforcement effect cannot be guaranteed.

[0080] In the above embodiment, the electrolyte inside the housing 11 can pass through the second through hole 15131 and infiltrate the battery cell unit 13, thereby improving the wetting performance of the electrolyte on the electrode sheet 1311. In addition, the second through hole 15131 can reduce the weight and volume of the reinforcing rib 1513, which can reduce the weight of the battery 10 on the one hand, and reserve more space for the electrolyte on the other hand. The total flow area of ​​at least one second through hole 15131 is smaller than the total flow area of ​​multiple first through holes 1511, which can ensure that the reinforcing rib 1513 has sufficient strength and allow the battery 10 to accommodate more electrolyte.

[0081] See also Figure 2 and Figure 3 As an optional technical solution of the present application, the flow area of ​​the second through hole 15131 is smaller than the flow area of ​​the first through hole 1511.

[0082] Specifically, the flow area of ​​the second through hole 15131 is smaller than the flow area of ​​the first through hole 1511, and the flow area of ​​the second through hole 15131 may be 0.9 times, 0.89 times, 0.79 times, 0.65 times, 0.56 times, 0.45 times, 0.33 times, 0.23 times, or 0.11 times the flow area of ​​the first through hole 1511. If the flow area of ​​the second through hole 15131 is larger than the flow area of ​​the first through hole 1511, it means that the overall volume of the reinforcing rib 1513 becomes larger, resulting in the complexity of the manufacture and assembly of the reinforcing rib 1513, increasing the production cost, and increasing the difficulty of connecting the reinforcing rib 1513 with the side wall 153.

[0083] In the above embodiment, the flow area of ​​the second through hole 15131 is smaller than the flow area of ​​the first through hole 1511, so that the overall volume of the reinforcing rib 1513 is appropriate and easy to manufacture.

[0084] See also Figure 2 and Figure 3 As an optional technical solution of the present application, at least one third through hole 1531 is provided on the side wall 153 , and the total flow area of ​​the at least one third through hole 1531 is smaller than the total flow area of ​​the plurality of first through holes 1511 .

[0085] Specifically, the third through hole 1531 penetrates the side wall 153 in the first direction X or the second direction Y. The third through hole 1531 can be one, two, three, or more, which is not limited in the present application. The second through hole 15131 can be circular, square, racetrack-shaped, or other shapes.

[0086] In the above embodiment, the electrolyte inside the housing 11 can pass through the third through hole 1531 and infiltrate the battery cell unit 13, thereby improving the wetting performance of the electrolyte on the electrode sheet 1311. In addition, the third through hole 1531 can reduce the weight and volume of the side wall 153, which can reduce the weight of the battery 10 on the one hand, and reserve more space for the electrolyte on the other hand. The total flow area of ​​at least one third through hole 1531 is smaller than the total flow area of ​​multiple first through holes 1511, which can ensure that the side wall 153 has sufficient strength and allow the battery 10 to accommodate more electrolyte.

[0087] See also Figure 2 and Figure 3 As an optional technical solution of the present application, the flow area of ​​the third through hole 1531 is smaller than the flow area of ​​the first through hole 1511.

[0088] Specifically, the flow area of ​​the third through hole 1531 is smaller than the flow area of ​​the first through hole 1511, and the flow area of ​​the third through hole 1531 may be 0.9 times, 0.89 times, 0.79 times, 0.65 times, 0.56 times, 0.45 times, 0.33 times, 0.23 times, or 0.11 times the flow area of ​​the first through hole 1511. If the flow area of ​​the third through hole 1531 is larger than the flow area of ​​the first through hole 1511, it means that the overall volume of the side wall 153 becomes larger, resulting in the complexity of the manufacture and assembly of the side wall 153, increasing the production cost, and increasing the difficulty of connecting the reinforcing rib 1513 with the side wall 153.

[0089] In the above embodiment, the flow area of ​​the third through hole 1531 is smaller than the flow area of ​​the first through hole 1511, which can make the overall volume of the side wall 153 appropriate and easy to manufacture. In addition, the electrolyte inside the shell 11 can pass through the third through hole 1531 and infiltrate the battery cell unit 13, thereby improving the wetting performance of the electrolyte on the electrode sheet 1311. In addition, the third through hole 1531 can reduce the weight and volume of the side wall 153, which can reduce the weight of the battery 10 on the one hand, and reserve more space for the electrolyte on the other hand. The flow area of ​​the third through hole 1531 is smaller than the flow area of ​​the first through hole 1511, which can ensure that the side wall 153 has sufficient strength and allow the battery 10 to accommodate more electrolyte.

[0090] See also Figure 1 and Figure 2 As an optional technical solution of the present application, the battery 10 is a cylindrical battery 10 (not shown), the outer contour of the cross section of the battery cell unit 13 is circular, and the outer contour of the cross section of the side wall 153 is circular.

[0091] Specifically, the cross section of the battery cell unit 13 and the cross section of the side wall 153 are planes obtained by cutting the battery cell unit 13 and the side wall 153 by the XY plane.

[0092] In the above embodiment, the outer contour of the cross section of the side wall 153 is circular, which enables the limiting structure 15 to be suitable for the cylindrical battery 10 .

[0093] See also Figure 1 and Figure 2 As an optional technical solution of the present application, the battery 10 is a square battery 10, the outer contour of the cross section of the battery cell unit 13 is square, and the outer contour of the cross section of the side wall 153 is square.

[0094] Specifically, the cross section of the battery cell unit 13 and the cross section of the side wall 153 are also planes obtained by cutting the battery cell unit 13 and the side wall 153 by the XY plane.

[0095] In the above embodiment, the outer contour of the cross section of the side wall 153 is a square, which enables the limiting structure 15 to be suitable for the square battery 10 .

[0096] See also Figure 2 and Figure 3As an optional technical solution of the present application, the side wall 153 includes a first side wall 1533, a second side wall 1535, a third side wall 1537 and a fourth side wall 1539 connected in sequence. The peripheral side surface 1315 includes a first peripheral side surface 13151, a second peripheral side surface 13153, a third peripheral side surface 13155 and a fourth peripheral side surface 13157 connected in sequence. The first side wall 1533 is attached to the first peripheral side surface 13151, the second side wall 1535 is attached to the second peripheral side surface 13153, the third side wall 1537 is attached to the third peripheral side surface 13155, the fourth side wall 1539 is attached to the fourth peripheral side surface 13157, and the bottom wall 151 is attached to the first surface 1312 and / or the second surface 1313.

[0097] Specifically, the side wall 153 includes a first side wall 1533 and a third side wall 1537 in the second direction Y, and includes a second side wall 1535 and a fourth side wall 1539 in the first direction X. The peripheral side surface 1315 includes a first peripheral side surface 13151 and a third peripheral side surface 13155 in the second direction Y, and includes a second peripheral side surface 13153 and a fourth peripheral side surface 13157 in the first direction X. The first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 may be an integral structure, thereby improving the bonding strength between the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539, preventing the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 from being separated during the operation of the limiting structure 15, thereby ensuring the stability and reliability of the operation of the limiting structure 15. In other embodiments, the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 are split structures, that is, the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 are different structures. In one example, the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 can be connected together in a detachable connection manner, and the detachable connection manner includes but is not limited to snap connection or threaded connection. In another example, the first side wall 1533, the second side wall 1535, the third side wall 1537 and the fourth side wall 1539 can be connected together in a non-detachable connection manner, and the non-detachable connection manner includes but is not limited to bonding or welding. The bottom wall 151 can be attached to the first surface 1312, can be attached to the second surface 1313, or can be attached to both the first surface 1312 and the second surface 1313.

[0098] In the above embodiment, the first side wall 1533 is in contact with the first peripheral side surface 13151, and the third side wall 1537 is in contact with the third peripheral side surface 13155, so that the first side wall 1533 and the third side wall 1537 can limit the misalignment of the battery cell unit 13 in the second direction Y, the second side wall 1535 is in contact with the second peripheral side surface 13153, and the fourth side wall 1539 is in contact with the fourth peripheral side surface 13157, so that the second side wall 1535 and the fourth side wall 1539 can limit the misalignment of the battery cell unit 13 in the first direction X. The bottom wall 151 is in contact with the first surface 1312 and / or the second surface 1313, so that the battery cell unit 13 can expand uniformly in the third direction Z.

[0099] See also Figure 2 and Figure 3 As an optional technical solution of the present application, the bottom wall 151 is provided with a plurality of first through holes 1511 arranged in sequence in the length direction, and a first support portion 1515 and a second support portion 1517 are formed at both ends of the bottom wall 151 in the length direction, and a reinforcing rib 1513 is formed between two adjacent first through holes 1511. The three sides of the first support portion 1515 are respectively connected to the first side wall 1533, the second side wall 1535 and the third side wall 1537, the three sides of the second support portion 1517 are respectively connected to the first side wall 1533, the fourth side wall 1539 and the third side wall 1537, and the opposite ends of the reinforcing rib 1513 are respectively connected to the first side wall 1533 and the third side wall 1537. The size of the first support portion 1515 in the length direction of the bottom wall 151 is not less than the height of each side wall 153. The size of the second support portion 1517 in the length direction of the bottom wall 151 is not less than the height of each side wall 153.

[0100] Specifically, the first support portion 1515 can be integrally formed with the first side wall 1533, the second side wall 1535 and the third side wall 1537, or can be separately formed. The second support portion 1517 can be integrally formed with the first side wall 1533, the fourth side wall 1539 and the third side wall 1537, or can be separately formed.

[0101] See also Figure 2 and Figure 3In the above embodiment, the first support portion 1515 and the second support portion 1517 can limit the battery cell unit 13 in the third direction Z to reduce the deformation of the battery cell unit 13 and the misalignment between the pole pieces 1311 when the battery 10 vibrates, reduce the shaking amplitude of the battery cell unit 13 in the third direction Z, and improve the performance and safety of the battery cell unit 13. Furthermore, the three sides of the first support portion 1515 are respectively connected to the first side wall 1533, the second side wall 1535 and the third side wall 1537, which can enhance the stability of the first side wall 1533, the second side wall 1535 and the third side wall 1537, and improve the connection strength of the first side wall 1533, the second side wall 1535 and the third side wall 1537; the three sides of the second support portion 1517 are respectively connected to the first side wall 1533, the fourth side wall 1539 and the third side wall 1537, which can enhance the connection strength of the first side wall 1533, the fourth side wall 1539 and the third side wall 1537, and improve the stability of the first side wall 1533, the fourth side wall 1539 and the third side wall 1537. The dimension of the first support portion 1515 in the length direction of the bottom wall 151 is not less than the height of each side wall 153, and the dimension of the second support portion 1517 in the length direction of the bottom wall 151 is not less than the height of each side wall 153, which can further limit the deformation of the first side wall 1533 and the third side wall 1537 in the second direction Y.

[0102] See also Figure 4 The present application provides an energy storage device 100. The energy storage device 100 includes the battery 10 described in any one of the embodiments.

[0103] Specifically, the energy storage device 100 is an assembly composed of a plurality of energy storage batteries 10, which can realize energy storage and release by connecting and controlling the batteries 10. The functions of the energy storage device 100 include but are not limited to energy storage, energy scheduling and energy storage power stations. Specifically, in some applications, the energy storage device 100 can convert electrical energy into chemical energy for storage to meet the electricity demand during peak energy demand periods, thereby playing the role of energy storage. In other applications, the energy storage device 100 can flexibly adjust the supply and demand of electrical energy, achieve energy balance and scheduling, and improve energy utilization, thereby playing the role of energy scheduling. In some other applications, the energy storage device 100 can form an energy storage power station to store and schedule energy on a large scale, provide a reliable energy supply, and thus play the role of an energy storage power station.

[0104] The energy storage device 100 includes a battery 10 and a battery box 30. The battery 10 is the smallest unit for storing and releasing electrical energy. The collection of batteries 10 can achieve energy storage and release by connecting and controlling the batteries 10. In the energy storage device 100, there are multiple batteries 10, and the multiple batteries 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple batteries 10 are both connected in series and in parallel. Multiple batteries 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of multiple batteries 10 is accommodated in a carrier (battery box 30 of the energy storage device 100). The energy storage device 100 may also include other structures. For example, the energy storage device 100 may also include a converging component (not shown) for achieving electrical connection between multiple batteries 10. It can be understood that the number of batteries 10 in the energy storage device 100 can be adaptively adjusted according to the application scenario and capacity.

[0105] The battery box 30 is a structure for placing the battery 10. The cross-section of the battery box 30 (the plane cut by the XY plane) can be, but is not limited to, circular, elliptical, square or other polygonal. The material of the battery box 30 includes, but is not limited to, metal or non-metal, wherein metal includes aluminum, iron, steel, aluminum alloy or iron alloy, etc., and non-metal includes, but is not limited to plastic, etc. In the present application, the cross-section of the battery box 30 is square, so that it can be easily integrated into the energy storage device 100. The material of the battery box 30 is aluminum alloy, so that while ensuring the strength, it can also make the energy storage device 100 lighter and easier to transport.

[0106] The battery box 30 includes a box body 31 and a cover body 33. The box body 31 and the cover body 33 are combined to form a storage cavity, and the battery 10 cluster is stored in the storage cavity. Among them, the box body 31 is a component in the battery box 30 that loads and supports the battery 10. One end of the box body 31 is closed, and the other end is provided with an opening, and the opening is used for the battery 10 to be loaded into the storage cavity. The cover body 33 is a component in the battery box 30 that covers the opening. The connection between the box body 31 and the cover body 33 can be a detachable connection or a non-detachable connection. The detachable connection includes but is not limited to a screw connection, a snap connection, or a combination of a screw connection and a snap connection. The non-detachable connection includes but is not limited to a gluing connection, welding, or a combination of a gluing connection and welding. In the present application, the box body 31 and the cover body 33 are detachably connected.

[0107] In addition, when the battery box 30 includes a box body 31 and a cover body 33, the battery box 30 may not be limited to being made of one material. For example, the box body 31 and the cover body 33 may be made of the same material, which is aluminum alloy. The battery box 30 may also have different components made of different materials. For example, the box body 31 is made of a metal material, and the cover body 33 is made of plastic. Of course, the material of the box body 31 and the material of the cover body 33 may also be a combination of other different materials, which are not listed here one by one.

[0108] In the above embodiment, the limiting structure 15 of the battery 10 can clamp the first end 1317 and / or the second end 1318 of the battery cell unit 13, so as to fix the edge of the pole piece 1311, and then fix the spacing between the pole pieces 1311 during the cycle of the battery 10. When the battery 10 is vibrated or squeezed, the limiting structure 15 can limit the misalignment of the pole piece 1311, that is, limit the deformation of the pole piece 1311 in the first direction X and the second direction Y (that is, the spacing between adjacent pole pieces 1311), avoid the misalignment between the pole pieces 1311. The increase in the transmission path of the metal ions is avoided, the problem of metal ion precipitation is reduced, and wrinkles on the surface of the pole piece 1311 caused by uneven expansion of the pole piece 1311 can be avoided, thereby ensuring the cycle life and safety performance of the battery 10.

[0109] See also Figure 5 , the present application provides an electric device 1000. The electric device 1000 includes an energy storage device 100.

[0110] Specifically, the battery 10 or energy storage device 100 disclosed in the present application can be used for an electrical device 1000 that uses the energy storage device 100 as a power source. The electrical device 1000 may be, but is not limited to, an electric vehicle, an electric tool, a mobile phone, a ship or a spacecraft, etc. Among them, the spacecraft may include a drone, a rocket, a space shuttle, etc. This application is only illustrated by taking the electrical device 1000 as a vehicle as an example. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. An energy storage device 100 is provided inside the vehicle, and the energy storage device 100 may be provided at the bottom, head or tail of the vehicle. The energy storage device 100 can be used for powering the vehicle, for example, the energy storage device 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery 10 pack to power the motor, for example, for starting, navigating and driving the vehicle. Working power requirements. In some embodiments, the energy storage device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0111] In the above embodiment, the limiting structure 15 of the battery 10 of the energy storage device 100 can clamp the first end 1317 and / or the second end 1318 of the battery cell 13, so as to fix the edge of the pole piece 1311, and then fix the spacing between the pole pieces 1311 during the cycle of the battery 10. When the battery 10 is vibrated or squeezed, the limiting structure 15 can limit the misalignment of the pole piece 1311, that is, limit the deformation of the pole piece 1311 in the first direction X and the second direction Y (that is, the spacing between adjacent pole pieces 1311), avoid the increase of the transmission path of the metal ions due to the misalignment between the pole pieces 1311, reduce the problem of metal ion precipitation, and avoid wrinkles on the surface of the pole piece 1311 due to uneven expansion of the pole piece 1311, thereby ensuring the cycle life and safety performance of the battery 10.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: A housing, the housing comprising a top cover and a bottom cover facing each other, at least one of the top cover and the bottom cover being provided with a pole; A battery cell unit, the battery cell unit comprising at least one battery cell, the battery cell comprising a pole piece, the battery cell unit comprising a first surface opposite to the top cover, a second surface opposite to the bottom cover, and a peripheral side surface connected to the first surface and the second surface, the battery cell unit further comprising a first end located on a side of the first surface and a second end located on a side of the second surface; and A limiting structure is installed at the first end and / or the second end, and is used to at least limit the pole piece of the first end from deforming toward the peripheral side surface and / or limit the pole piece of the second end from deforming toward the peripheral side surface.

2. The battery according to claim 1, characterized in that The limiting structure includes a bottom wall and side walls extending from the periphery of the bottom wall, the bottom wall and the side walls together form a limiting cavity, the first end and / or the second end is accommodated in the limiting cavity, and the peripheral side surfaces of the battery cell unit are in contact with the side walls.

3. The battery according to claim 2, characterized in that The bottom wall is provided with at least one first through hole.

4. The battery according to claim 2, characterized in that The bottom wall is provided with a plurality of first through holes, the plurality of first through holes are spaced apart from each other, and a reinforcing rib is formed between two adjacent first through holes, and opposite ends of the reinforcing rib are connected to the side wall.

5. The battery according to claim 4, characterized in that The reinforcing rib is provided with at least one second through hole. The total flow area of ​​at least one of the second through holes is smaller than the total flow area of ​​the plurality of the first through holes; and / or The flow area of ​​the second through hole is smaller than the flow area of ​​the first through hole.

6. The battery according to claim 2, characterized in that The bottom wall is provided with a plurality of first through holes, and the side wall is provided with at least one third through hole. The total flow area of ​​at least one of the third through holes is smaller than the total flow area of ​​the plurality of first through holes; and / or The flow area of ​​the third through hole is smaller than the flow area of ​​the first through hole.

7. The battery according to claim 2, characterized in that The battery is a cylindrical battery, the outer contour of the cross section of the battery cell is circular, and the outer contour of the cross section of the side wall is circular; or, The battery is a square battery, the outer contour of the cross section of the battery cell unit is square, and the outer contour of the cross section of the side wall is square.

8. The battery according to claim 2, characterized in that The side walls include a first side wall, a second side wall, a third side wall and a fourth side wall connected in sequence, the peripheral side surfaces include a first peripheral side surface, a second peripheral side surface, a third peripheral side surface and a fourth peripheral side surface connected in sequence, the first side wall is in contact with the first peripheral side surface, the second side wall is in contact with the second peripheral side surface, the third side wall is in contact with the third peripheral side surface, the fourth side wall is in contact with the fourth peripheral side surface, and the bottom wall is in contact with the first surface and / or the second surface.

9. The battery according to claim 8, characterized in that The bottom wall is provided with a plurality of first through holes arranged in sequence in the length direction, and a first supporting portion and a second supporting portion are formed at both ends of the bottom wall in the length direction, and a reinforcing rib is formed between two adjacent first through holes, the three sides of the first supporting portion are respectively connected to the first side wall, the second side wall and the third side wall, the three sides of the second supporting portion are respectively connected to the first side wall, the fourth side wall and the third side wall, and the opposite ends of the reinforcing rib are respectively connected to the first side wall and the third side wall; The dimension of the first supporting portion in the length direction of the bottom wall is not less than the height of each of the side walls; and / or The dimension of the second supporting portion in the length direction of the bottom wall is not less than the height of each of the side walls.

10. An energy storage device, characterized in that: include: The battery according to any one of claims 1 to 9.

11. An electrical device, characterized in that: include: The energy storage device according to claim 10.

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