Secondary battery, battery pack and energy storage box

Abstract

The utility model provides a secondary battery, a battery pack and an energy storage box, the secondary battery comprises a shell, a naked battery cell and an end cover assembly, the shell comprises a first main body part and a second main body part, the first main body part comprises a top cover and a side plate which are integrally formed, the top cover is provided with a mounting hole, the side plate is arranged along the circumferential direction of the top cover, the side plate extends along the height direction of the secondary battery, and the naked battery cell is arranged in the second main body part; the side plate is connected with the second main body part, the first main body part is provided with a buckle, an opening of the second main body part is provided with a clamping groove, the first main body part and the second main body part are connected through the clamping groove and the buckle, the naked battery cell is installed in the shell, the end cover assembly is installed on the top cover and comprises a pole column and a connecting piece, the connecting piece is connected with the naked battery cell and the pole column, and the pole column is installed in the installation hole. The side plate can increase the height of the first main body part so as to increase the capacity of the first main body part, so that the overall capacity of the secondary battery can be improved, and the manufacturing of a secondary battery with larger capacity is facilitated.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and specifically to a secondary battery, a battery pack and an energy storage box. Background Art

[0002] Secondary batteries are commonly used electrical energy storage devices. With the development of technology, the demand for the capacity of secondary batteries is also increasing. Most of the current secondary batteries are packaged in metal shells such as aluminum shells. Due to the performance of the material itself, when the raw material is stretched or stamped, its size will be limited, and it is impossible to process a larger shell. Ultimately, the size of the battery is limited, the capacity of the secondary battery is small, and it is difficult to increase the capacity of the battery. Utility Model Content

[0003] In view of this, the present application provides a secondary battery, a battery pack and an energy storage box to help solve the problem of small battery capacity in the prior art.

[0004] The present application provides a secondary battery, the secondary battery comprising:

[0005] A housing, the housing comprising a first main body and a second main body, the first main body comprising an integrally formed top cover and a side plate, the top cover having a mounting hole, the side plate being arranged along the circumference of the top cover, the side plate extending along the height direction of the secondary battery, the side plate being connected to the second main body, the first main body having a buckle, the opening of the second main body having a slot, the first main body and the second main body being connected via the slot and the buckle;

[0006] A bare battery cell, wherein the bare battery cell is installed inside the housing;

[0007] An end cover assembly is installed on the top cover, comprising a pole and a connector, the connector connects the bare cell and the pole, and the pole is installed in the mounting hole.

[0008] The side plate is connected to the second main body, the first main body has a buckle, the opening of the second main body has a slot, and the first main body and the second main body are connected by the slot and the buckle. The slot and the buckle do not require additional connectors, which facilitates the assembly of the secondary battery. The side plate can increase the height of the first main body, thereby increasing the capacity of the first main body. The sum of the capacity of the first main body and the capacity of the second main body is equal to the total capacity of the shell, so the overall capacity of the secondary battery can be increased, which is conducive to manufacturing a larger capacity secondary battery to meet more different needs. In this application, the battery shell is separated, and the first main body and the second main body each realize a part of the accommodation function. When the two are installed in coordination, the overall volume of the shell can be increased, thereby achieving the effect of increasing the capacity of the secondary battery.

[0009] In a possible implementation, the second main body is provided with the end cover assembly, and the end cover assembly is installed on the bottom wall of the second main body. The pole provided in the first main body is a positive pole, and the pole provided in the second main body is a negative pole.

[0010] In a possible implementation manner, the secondary battery has a protective member, the material of the protective member is an insulating material, and the protective member is sleeved on the shell.

[0011] In a possible implementation, the first main body includes a connecting portion, the connecting portion connects the top cover and the side plate, and an outer wall of the connecting portion is an inclined surface or a curved surface.

[0012] In a possible implementation, the buckle is located on the inner side of the side plate, the buckle extends toward the second main body, the slot is located on the inner wall of the second main body, and the slot is recessed toward the direction away from the first main body.

[0013] In a possible implementation manner, the first main body portion and the second main body portion are made of metal.

[0014] In a possible implementation manner, the first main body portion and the second main body portion are connected by welding.

[0015] In a possible embodiment, the end cover assembly includes a lower plastic, a first fixing member and a second fixing member, the lower plastic has a through hole, the through hole is connected to the mounting hole, the second fixing member is sleeved on the pole, and the second fixing member is made of insulating material, the first fixing member is sleeved on the second fixing member and connected to the top cover.

[0016] In a possible implementation manner, along a height direction of the secondary battery, height dimensions of the first main body portion and the second main body portion are respectively 30 mm to 220 mm.

[0017] The present application provides a battery pack, which includes a battery module and a shell, wherein the battery module is installed inside the shell, and the battery module includes a plurality of secondary batteries, and the secondary battery is the secondary battery described in any of the above embodiments.

[0018] The present application provides an energy storage box, which includes a box body, an inverter, a power management system and a battery pack, wherein the battery pack is the battery pack described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 A schematic structural diagram of an embodiment of a secondary battery provided in the present application;

[0021] Figure 2 An exploded view of an embodiment of a secondary battery provided in the present application;

[0022] Figure 3 An exploded view of an embodiment of an end cap assembly provided in the present application;

[0023] Figure 4 An exploded view of an implementation manner of the first main body and the second main body provided in the present application;

[0024] Figure 5 A schematic diagram of the structure of an implementation scheme of the buckle and the slot provided in this application;

[0025] Figure 6 A schematic structural diagram of an implementation scheme of a connecting portion provided in the present application;

[0026] Figure 7 A schematic structural diagram of an implementation scheme of the first main body provided in this application;

[0027] Figure 8 A schematic diagram of the structure of an embodiment of the battery pack provided in this application;

[0028] Fig. 9 A schematic structural diagram of an embodiment of the energy storage box provided in this application.

[0029] Description of reference numerals:

[0030] 1- housing;

[0031] 11- a first main body;

[0032] 111-top cover;

[0033] 112-side panel;

[0034] 113- buckle;

[0035] 114-connecting part;

[0036] 115-mounting hole;

[0037] 116-explosion-proof valve;

[0038] 117-Injection port;

[0039] 12- second main body;

[0040] 121-card slot;

[0041] 2-bare battery cell;

[0042] 3-end cover assembly;

[0043] 31-lower plastic;

[0044] 311-through hole;

[0045] 32-pole;

[0046] 33- first fixing member;

[0047] 34- second fixing member;

[0048] 35-connecting piece;

[0049] 36-seal;

[0050] 4- Top patch;

[0051] 5- Protective parts;

[0052] 6-Battery pack;

[0053] 61-battery module;

[0054] 62-housing;

[0055] 7-Energy storage box. DETAILED DESCRIPTION

[0056] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0057] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0058] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0059] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. 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.

[0060] like Figure 1 and Figure 2 As shown, the present application provides a secondary battery, which includes a shell 1, a bare cell 2 and an end cap assembly 3. The shell 1 has an installation cavity, and the bare cell 2 is installed inside the installation cavity. The shell 1 includes a first main body 11 and a second main body 12. The first main body 11 includes an integrally formed top cover 111 and a side plate 112. The top cover 111 has a mounting hole 115. The side plate 112 is arranged along the circumference of the top cover 111, and the side plate 112 extends along the height direction of the secondary battery. The second main body 12 can be a cube or a cylinder with an opening, and the first main body 11 and the second main body 12 are connected to achieve the sealing of the shell 1.

[0061] like Figure 5 As shown, specifically, the side plate 112 is connected to the second main body 12, the first main body 11 has a buckle 113, the opening of the second main body 12 has a slot 121, and the first main body 11 and the second main body 12 are connected through the slot 121 and the buckle 113. The slot 121 and the buckle 113 do not require additional connectors 35, which is convenient for the assembly of the secondary battery. The side plate 112 can increase the height of the first main body 11, thereby increasing the capacity of the first main body 11. The sum of the capacity of the first main body 11 and the capacity of the second main body 12 is equal to the total capacity of the shell 1, so the overall capacity of the secondary battery can be increased, which is conducive to manufacturing a larger capacity secondary battery to meet more different needs. The current battery shell 1 is usually made of metal. Due to the performance of the material itself, when the battery shell 1 is formed by stamping or stretching, the material cannot be processed into a larger size, which results in the size of the secondary battery being limited, and further limits the capacity of the secondary battery. In the present application, the battery housing 1 is separated into two parts, and the first main body 11 and the second main body 12 each realize a part of the accommodating function. When the two are installed together, the overall volume of the housing 1 can be increased, thereby achieving the effect of increasing the capacity of the secondary battery.

[0062] like Figure 2As shown, the bare cell 2 is installed inside the shell 1. The size of the bare cell 2 can be reasonably set according to the volume of the shell 1. The shell 1 provided in the embodiment of the present application is composed of a first main body 11 and a second main body 12 that are connected together and have a large volume. Therefore, the volume of the bare cell 2 can also be set to a larger size accordingly, thereby increasing the capacity of the secondary battery. The end cap assembly 3 is installed on the top cover 111, including a pole 32 and a connector 35. The connector 35 connects the bare cell 2 and the pole 32. The end cap assembly 3 is provided with a through hole 311, which is connected to the mounting hole 115. The pole 32 is installed in the mounting hole 115 and at least partially can extend from the end cap assembly 3 to the outside, thereby facilitating device connection. The end cap assembly 3 is used to connect the bare cell 2 and external equipment so that the battery can discharge and charge.

[0063] A secondary battery is a device for storing electrical energy, in which the bare cell 2 is the core component for realizing charging and discharging. The bare cell 2 is usually formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet, and the negative electrode sheet and the positive electrode sheet are respectively provided with a tab. During the charging and discharging process of the secondary battery, the positive electrode sheet and the negative electrode sheet can undergo corresponding chemical reactions to realize the charging and discharging functions, and form a current loop through the tab, the pole column 32 and the external device circuit connection.

[0064] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector, and the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector. After winding, the negative electrode active material layer, the positive electrode active layer and the separator located therebetween constitute a winding structure. The negative electrode current collector can be cut to form a negative electrode tab, and the positive electrode current collector can be cut to form a positive electrode tab. The positive electrode tab and the negative electrode tab can be located together at one end of the winding structure, or the positive electrode tab and the negative electrode tab can be located at both ends of the winding structure.

[0065] The positive electrode tab is electrically connected to the positive electrode column through the positive electrode connecting sheet, and the negative electrode tab is electrically connected to the negative electrode column through the negative electrode connecting sheet. During the charge and discharge process of the secondary battery, the positive electrode active material and the negative electrode active material in the winding structure react with the electrolyte to generate electrical energy, which is then conducted to the positive electrode column through the positive electrode tab and the positive electrode connecting sheet, and to the negative electrode column through the negative electrode tab and the negative electrode connecting sheet, and the electrical energy is output through the positive electrode column and the negative electrode column.

[0066] The positive poles of multiple secondary batteries can be electrically connected through the positive connecting piece, and the negative poles of multiple secondary batteries can be electrically connected through the negative connecting piece, so as to realize the series connection, parallel connection or mixed connection of multiple secondary batteries.

[0067] like Figure 4As shown, in a possible embodiment, the second main body 12 is provided with an end cover assembly 3, and the end cover assembly 3 is installed on the bottom wall of the second main body 12. The pole 32 provided in the first main body 11 is a positive pole, and the pole 32 provided in the second main body 12 is a negative pole.

[0068] The first main body 11 and the second main body 12 are respectively provided with an end cap assembly 3. Along the height direction of the secondary battery, the poles 32 can be respectively located at the two ends of the secondary battery. Specifically, the positive pole and the negative pole are respectively located at two different end cap assemblies 3, that is, the positive pole and the negative pole are respectively at the two ends of the secondary battery. External equipment can connect the positive pole and the negative pole from the two ends of the secondary battery, and the secondary battery can meet the working needs under specific conditions. The poles 32 will generate heat when the secondary battery is working. The poles 32 are dispersedly arranged at the two ends of the secondary battery to reduce the concentration of heat and facilitate the heat dissipation of the secondary battery.

[0069] like Figure 2 As shown, in a possible implementation manner, the secondary battery has a protective member 5 , the material of the protective member 5 is an insulating material, and the protective member 5 is sleeved and disposed on the housing 1 .

[0070] The protective member 5 can be set to a film shape similar to the shell 1. The protective member 5 is coated on the surface of the shell 1 to protect the shell 1. When the secondary battery is subjected to external force impact, the protective member 5 can reduce the possibility of damage to the shell 1, and avoid the shell 1 being damaged and causing the shell 1 to lose its sealing, resulting in secondary battery failure or safety problems. The material of the protective member 5 is an insulating material, which can improve its protection performance. For example, its material can be a composite material composed of polyethylene terephthalate (PET) and a glue layer, which has good high-voltage breakdown resistance and puncture resistance, and has good tensile properties, and can provide physical protection for the secondary battery.

[0071] like Figure 6 As shown, in a possible implementation manner, the first main body portion 11 includes a connecting portion 114 , the connecting portion 114 connects the top cover 111 and the side plate 112 , and the outer wall of the connecting portion 114 is an inclined surface or a curved surface.

[0072] The material of the first main body 11 is usually a metal material, such as aluminum or steel. When the raw material is formed into the first main body 11 by stretching or other methods, the top cover 111 and the side plate 112 are in a relatively vertical position. At the connection between the two, sharp corners or burrs may appear, which may pierce the protective member 5 and affect the safety of the secondary battery. In the embodiment of the present application, a connecting portion 114 is set at a position between the top cover 111 and the side plate 112. The connecting portion 114 plays the role of transitioning the side plate 112 and the top cover 111. The connecting portion 114 can be a structure with an inclined surface or an arc surface, which will not cause the protective member 5 to be punctured and damaged when in contact with the protective member 5. The connecting portion 114 can be formed integrally with the top cover 111 and the side plate 112 when the first main body 11 is formed, or the top cover 111 and the side plate 112 can be processed first and then the connecting portion 114 is processed at the connection between the two.

[0073] like Figure 5 As shown, in a possible embodiment, the buckle 113 is located on the inner side of the side plate 112 , the buckle 113 extends toward the second main body 12 , the slot 121 is located on the inner wall of the second main body 12 , and the slot 121 is recessed toward the direction away from the first main body 11 .

[0074] The buckle 113 is located at the inner edge of the first main body 11, and can be set as a continuous ring or a plurality of discontinuous structures. The buckle 113 extends in the direction close to the second main body 12. The shape of the slot 121 is set corresponding to the shape of the buckle 113. The slot 121 can be set as a continuous ring groove or a plurality of discontinuous grooves. When the first main body 11 and the second main body 12 are buckled, the buckle 113 can extend into the slot 121 to realize the function of snapping, and plays a role in positioning and connecting the first main body 11 and the second main body 12. The first main body 11 and the second main body 12 can cooperate with welding to achieve a more stable connection. One of the buckle 113 and the slot 121 is set in the first main body 11, and the other is set in the second main body 12. The positions of the two can be flexibly set according to actual needs.

[0075] The slot 121 and the buckle 113 may also have other structures that enable the first main body 11 and the second main body 12 to be connected to each other. For example, the inner wall of the slot 121 may be provided with a recessed portion, and the side wall of the buckle 113 may be provided with a protruding portion. The protruding portion may be a spherical structure or the outer wall may be an arc-shaped structure, and the shape of the recessed portion is adaptively arranged with the protruding portion. When the buckle 113 is inserted into the slot 121 and cooperates with each other, the protruding portion may be inserted into the recessed portion for position limiting, so that the connection between the slot 121 and the buckle 113 is more stable. The protruding portion may be arranged on the side wall of the buckle 113, and the recessed portion may be arranged on the inner wall of the slot 121. The material of the buckle 113 is a material with certain elasticity such as metal or plastic. When the buckle 113 is inserted into the slot 121 and slides along the inner wall of the slot 121, the buckle 113 may be deformed to a certain extent until the protruding portion slides to the recessed portion and the buckle 113 recovers its deformation. One end of the buckle 113 close to the slot 121 can be set as an arc surface or a conical surface, which can achieve a guiding effect when the first body part 11 and the second body part 12 are installed, so that the buckle 113 can be smoothly inserted into the slot 121 for locking.

[0076] In a possible implementation manner, the first main body portion 11 and the second main body portion 12 are made of metal.

[0077] The material of the first main body 11 and the second main body 12 can be a metal material such as aluminum or steel, to which metal elements such as manganese, copper, magnesium, iron and silicon can be added. For example, adding copper and magnesium can improve the hardness and strength of the shell 1, and adding manganese can improve the corrosion resistance of the shell 1. Aluminum is easy to make a thinner thickness, which is beneficial to reducing the weight of the secondary battery. Aluminum can be formed by extrusion, with high dimensional processing accuracy and stable chemical properties. Steel has stable physical properties and strong compressive resistance. The material of the first main body 11 and the second main body 12 can be flexibly selected according to actual needs.

[0078] In a possible implementation manner, the first main body portion 11 and the second main body portion 12 are connected by welding.

[0079] Welding is a method of heating and pressurizing the first main body 11 and the second main body 12 so that the atoms of the two objects generate a bonding force and are connected to each other as a whole. Welding can be performed by methods such as fusion welding, pressure welding or brazing, and the specific method can be selected based on the material of the first main body 11 and the second main body 12 and the use environment. The welding method can save metal materials, and the welded joint position has good mechanical properties and sealing properties, which can meet the use requirements of secondary batteries. After the first main body 11 and the second main body 12 are connected to each other through the bayonet and the slot 121, they are further connected by welding, which can improve the reliability of the shell 1 and reduce the possibility of the first main body 11 and the second main body 12 being separated from each other or the sealing being reduced.

[0080] like Figure 3 As shown, in a possible embodiment, the end cap assembly 3 includes a lower plastic 31, a first fixing member 33 and a second fixing member 34. The lower plastic 31 has a through hole 311, which is connected to the mounting hole 115. The second fixing member 34 is sleeved on the pole 32, and the second fixing member 34 is made of insulating material. The first fixing member 33 is sleeved on the second fixing member 34 and connected to the top cover 111. The lower plastic 31 is used to install the pole 32, wherein the through hole 311 penetrates the lower plastic 31 along the height direction of the secondary battery. Part of the pole 32 can pass through the through hole 311 and the mounting hole 115 and extend from the lower plastic top cover 111, which is convenient for connection with external equipment. Another part of the pole 32 can be connected to the connector 35, and further connected to the bare battery cell 2 through the connector 35. The second fixing member 34 is used to isolate the pole 32 and the top cover 111 to achieve an insulation function. The first fixing member 33 is sleeved on the second fixing member 34 and connected to the top cover 111 to achieve downward pressing and fixing of the second fixing member 34. The second fixing member 34 can further press down the pole 32 to achieve a fixing effect on the pole 32.

[0081] like Figure 7 As shown, the top cover 111 may be provided with an explosion-proof valve 116 and a liquid injection port 117 , and the lower plastic 31 is correspondingly provided with corresponding openings for communication.

[0082] In a possible embodiment, along the height direction of the secondary battery, the height dimensions of the first main body 11 and the second main body 12 are 30mm to 220mm respectively. For example, 30mm, 40mm, 60mm, 100mm, 120mm, 150mm, 180mm, 200mm or 220mm. The sum of the heights of the first main body 11 and the second main body 12 is the overall height dimension of the shell 1, and the overall height dimension of the shell 1 can be 60mm to 440mm. The width and length of the first main body 11 and the second main body 12 are respectively the same, wherein the width can be 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, etc., and the length can be 150mm, 155mm, 160mm, 165mm, 170mm, 175mm, 180mm, 185mm, 190mm, etc. The length and width can be flexibly set according to actual needs, and no specific restrictions are made here.

[0083] The housing 1 provided in the embodiment of the present application includes a first main body 11 and a second main body 12, both of which can provide a storage space, and the combination of the two can achieve a larger capacity size. The first main body 11 and the second main body 12 are arranged separately so that both can increase the overall capacity of the housing 1, so that the housing 1 has a larger volume, the secondary battery can achieve a larger capacity, and the processing difficulty can be greatly reduced.

[0084] Furthermore, the housing 1 may include other parts in addition to the first main body 11 and the second main body 12, such as a third main body. The third main body may be an annular structure located between the first main body 11 and the second main body 12. The first main body 11 and the second main body 12 are located at both ends of the third main body and connected to the third main body. The provision of multiple main bodies facilitates the increase of the volume of the housing 1 and the capacity of the secondary battery. In addition to being provided along the height direction of the secondary battery, the first main body 11 and the second main body 12 may also be provided along the width direction or the length direction of the secondary battery.

[0085] like Figure 8 As shown, the present application provides a battery pack 6, which includes a battery module 61 and a shell 62. The battery module 61 is installed inside the shell 62. The battery module 61 includes multiple secondary batteries, and the secondary batteries are the secondary batteries described in any of the above embodiments.

[0086] The housing 62 may be made of aluminum, aluminum alloy or other metal materials, or may also be made of non-metallic materials. The housing 62 is used to provide a storage space for the secondary battery, and the housing 62 may adopt a variety of structures.

[0087] In some embodiments, the housing 62 may include a bottom cover and an upper cover, the bottom cover is an open top structure, the size of the upper cover is comparable to the size of the top opening of the bottom cover, the upper cover can be covered on the bottom cover, and the upper cover and the bottom cover can be connected by bolts and other fixings, and the upper cover and the bottom cover enclose a storage space for accommodating the secondary battery. The housing 62 may be in various shapes, such as a cylinder, a cuboid, etc.

[0088] A sealing member 36 may also be provided between the upper cover and the bottom cover to seal the accommodating space.

[0089] In the battery pack 6, multiple secondary batteries can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple secondary batteries are connected in series and in parallel. In some embodiments, multiple secondary batteries can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple secondary batteries is accommodated in the housing 62. Multiple secondary batteries can be arranged side by side along the length direction of the battery pack 6, or they can also be arranged side by side along the width direction of the battery pack 6.

[0090] In other embodiments, multiple secondary batteries may be connected in series, in parallel, or in hybrid connection to form a battery module 61, and then multiple battery modules 61 may be connected in series, in parallel, or in hybrid connection to form a whole, and accommodated in the housing 62. The battery module 61 includes a frame structure, which may include an end plate, a side plate 112, a top plate, and a bottom plate connected to each other. Multiple secondary batteries are located in the inner cavity of the frame structure and are stacked in the inner cavity of the frame structure. The stacking direction may be the length direction, the width direction, or the height direction.

[0091] In addition, the battery pack 6 may further include other structures, such as a busbar component, for realizing electrical connection between multiple secondary batteries.

[0092] The secondary battery may be cylindrical, flat, rectangular or in other shapes.

[0093] The secondary battery includes a housing 1 , a top cover 111 , a bare cell 2 and other functional components.

[0094] like Fig. 9 As shown, the present application provides an energy storage box 7, which includes a box body, an inverter, a power management system and a battery pack 6, wherein the battery pack 6 is the battery pack 6 described in any of the above embodiments.

[0095] The box has a receiving cavity, and the inverter and the battery pack 6 are received in the receiving cavity. The inverter is used to convert direct current into alternating current. The inverter has the advantages of high conversion efficiency, fast startup speed, high safety, etc., and can also have the functions of short circuit, overload, over / under voltage and over-temperature protection.

[0096] Some large energy storage boxes 7 may also include a power management system, which is used to make the battery pack 6 operate within a safe working range. The power management system can control the charging and discharging power of the battery pack 6 according to factors such as ambient temperature, battery status, and power demand, thereby improving the safety of the battery pack 6 and making the working state of the battery pack 6 more reasonable, which is beneficial to improving the battery life and service life of the battery pack 6.

[0097] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A secondary battery, characterized in that: The secondary battery comprises: A shell (1), the shell (1) comprising a first main body (11) and a second main body (12), the first main body (11) comprising an integrally formed top cover (111) and a side plate (112), the top cover (111) having a mounting hole (115), the side plate (112) being arranged along the circumference of the top cover (111), the side plate (112) extending along the height direction of the secondary battery, the side plate (112) being connected to the second main body (12), the first main body (11) having a buckle (113), the opening of the second main body (12) having a slot (121), the first main body (11) and the second main body (12) being connected via the slot (121) and the buckle (113); A bare battery core (2), wherein the bare battery core (2) is installed inside the housing (1); An end cover assembly (3), the end cover assembly (3) being mounted on the top cover (111), comprising a pole (32) and a connector (35), the connector (35) connecting the bare cell (2) and the pole (32), and the pole (32) being mounted in the mounting hole (115).

2. The secondary battery according to claim 1, characterized in that: The second main body (12) is provided with the end cover assembly (3), and the end cover assembly (3) is installed on the bottom wall of the second main body (12); the pole (32) provided on the first main body (11) is a positive pole, and the pole (32) provided on the second main body (12) is a negative pole.

3. The secondary battery according to claim 1, characterized in that: The secondary battery has a protective component (5), the material of the protective component (5) is an insulating material, and the protective component (5) is sleeved and arranged on the shell (1).

4. The secondary battery according to claim 1, characterized in that: The first main body (11) comprises a connecting portion (114), wherein the connecting portion (114) connects the top cover (111) and the side plate (112), and an outer wall of the connecting portion (114) is an inclined surface or a curved surface.

5. The secondary battery according to claim 1, characterized in that: The buckle (113) is located on the inner side of the side plate (112), and the buckle (113) extends in a direction close to the second main body (12). The slot (121) is located on the inner wall of the second main body (12), and the slot (121) is recessed in a direction away from the first main body (11).

6. The secondary battery according to claim 1, characterized in that: The first main body part (11) and the second main body part (12) are made of metal.

7. The secondary battery according to claim 1, characterized in that: The first main body part (11) and the second main body part (12) are connected by welding.

8. The secondary battery according to claim 1, characterized in that: The end cover assembly (3) comprises a lower plastic (31), a first fixing member (33) and a second fixing member (34); the lower plastic (31) has a through hole (311), the through hole (311) is connected to the mounting hole (115); the second fixing member (34) is sleeved on the pole (32), and the second fixing member (34) is made of insulating material; the first fixing member (33) is sleeved on the second fixing member (34) and is connected to the top cover (111).

9. The secondary battery according to any one of claims 1 to 8, characterized in that: Along the height direction of the secondary battery, the height dimensions of the first main body (11) and the second main body (12) are respectively 30 mm to 220 mm.

10. A battery pack, characterized in that: The battery pack (6) comprises a battery module (61) and a housing (62), wherein the battery module (61) is installed inside the housing (62), and the battery module (61) comprises a plurality of the secondary batteries, wherein the secondary batteries are the secondary batteries described in any one of claims 1 to 9.

11. An energy storage box, characterized in that: The energy storage box (7) comprises a box body, an inverter, a power management system and a battery pack (6), wherein the battery pack (6) is the battery pack (6) according to claim 9.

Images