A secondary battery connector, a secondary battery, a battery pack and an energy storage box

Abstract

The present application provides a secondary battery connector, a secondary battery, a battery pack and an energy storage box. The secondary battery connector includes a connecting part, a fuse hole and a fuse part. The connecting part includes a first connecting part and a second connecting part. Along the width direction of the secondary battery connector, the second connecting part is located on both sides of the first connecting part. The fuse hole penetrates the connecting part along the thickness direction of the secondary battery connector. Along the width direction of the secondary battery connector, the fuse hole is located between the first connecting part and the second connecting part. The position between the fuse hole and the connecting part forms a fuse area. The fuse part is located in the fuse area. The groove is located between the first connecting part and the second connecting part. The groove extends to the inner side of the secondary battery connector. The secondary battery connector provided by the present application can be melted when a battery failure occurs, thereby realizing the function of protecting the battery and improving the safety and reliability of the battery.

Description

Technical Field

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

[0002] Batteries are commonly used energy storage devices. With the advancement of technology, the capacity and density of batteries are constantly improving, and the operating voltage and current are also increasing. There are certain safety hazards during use, especially when the battery fails and short-circuits, it will generate huge current and generate a lot of heat, which may cause fire or even explosion, resulting in safety accidents. Utility Model Content

[0003] In view of this, the present application provides a secondary battery connector, a secondary battery, a battery pack and an energy storage box, so as to solve the problem of insufficient battery safety in the prior art.

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

[0005] A connecting portion, the connecting portion comprising a first connecting portion and a second connecting portion, wherein the second connecting portion is located at both sides of the first connecting portion along the width direction of the secondary battery connecting member;

[0006] a groove, the groove being located between the first connecting portion and the second connecting portion, the groove extending toward the inner side of the secondary battery connecting member;

[0007] a fuse hole, wherein the fuse hole penetrates the connection part along the thickness direction of the secondary battery connection piece, and is located between the first connection part and the second connection part along the width direction of the secondary battery connection piece, and a fuse area is formed between the fuse hole and the groove;

[0008] A fuse portion is located in the fuse area.

[0009] In a possible implementation manner, the fuse hole has a first inclined portion at one end close to the groove, and the groove has a second inclined portion at one end close to the fuse hole, and adjacent first inclined portions and second inclined portions are parallel.

[0010] In a possible implementation manner, the secondary battery connector includes a plurality of the fuse holes, and the fuse holes are arranged at intervals along the length direction or the width direction of the secondary battery connector.

[0011] In a possible implementation manner, the distance between the groove and the fuse hole is D, and 6 mm ≤ D ≤ 9 mm.

[0012] In a possible implementation manner, along the thickness direction of the secondary battery connector, the thickness of the fuse portion is smaller than that of the connection portion.

[0013] In a possible implementation manner, the secondary battery connector includes a plurality of fuse parts, and along a width direction of the connector, the fuse parts are respectively located on both sides of the fuse hole.

[0014] In a possible implementation manner, the thickness of the fuse portion is H1, the thickness of the connection portion is H2, and 0.2≤H1 / H2≤0.5 is satisfied.

[0015] In a possible implementation manner, the secondary battery connector has an avoidance portion, the avoidance portion is located on a side of the first connector where the second connector is not provided, and the avoidance portion extends toward an inner side of the secondary battery connector.

[0016] The present application provides a secondary battery, comprising a battery cell, a pole and a secondary battery connector, wherein the battery cell has a pole ear, the pole is connected to the first connecting portion, the pole ear is connected to the second connecting portion, and the secondary battery connector is the secondary battery connector described in any of the above embodiments.

[0017] The present application provides a battery pack, which includes a plurality of battery modules and a housing, wherein the battery modules include a plurality of secondary batteries, and the secondary batteries are the secondary batteries described in any of the above embodiments.

[0018] The present application provides an energy storage box, which includes a shell, a battery pack inverter and a power management system. The battery pack is the battery pack described in any of the above embodiments.

[0019] The present application provides a secondary battery connector, a secondary battery, a battery pack and an energy storage box. The secondary battery connector includes a connecting part, a fuse hole and a fuse part. The connecting part includes a first connecting part and a second connecting part. Along the width direction of the secondary battery connector, the second connecting part is located on both sides of the first connecting part. The fuse hole penetrates the connecting part along the thickness direction of the secondary battery connector. Along the width direction of the secondary battery connector, the fuse hole is located between the first connecting part and the second connecting part. The position between the fuse hole and the connecting part forms a fuse area. The fuse part is located in the fuse area. The groove is located between the first connecting part and the second connecting part. The groove extends to the inner side of the secondary battery connector. The secondary battery connector provided by the present application can be melted when a battery failure occurs, thereby realizing the function of protecting the battery and improving the safety and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic structural diagram of an implementation scheme of a secondary battery connector provided in the present application;

[0022] Figure 2 A schematic structural diagram of an implementation scheme of a secondary battery connector provided in the present application;

[0023] Figure 3 A schematic structural diagram of an implementation scheme of a secondary battery connector provided in the present application;

[0024] Figure 4 A schematic structural diagram of an implementation scheme of a secondary battery connector provided in the present application;

[0025] Figure 5 A schematic structural diagram of an implementation scheme of a secondary battery connector provided in the present application;

[0026] Figure 6 A cross-sectional view of the connection portion and the fuse portion provided in this application;

[0027] Figure 7 A schematic structural diagram of an embodiment of a secondary battery provided in the present application;

[0028] Figure 8 A schematic structural diagram of an embodiment of a battery pack provided in the present application;

[0029] Fig. 9 A schematic structural diagram of an embodiment of the energy storage box provided in this application.

[0030] Description of reference numerals:

[0031] 1-Connection part;

[0032] 11- first connecting portion;

[0033] 12- second connecting portion;

[0034] 2-Fuse unit;

[0035] 21- second inclined portion;

[0036] 3-Fuse hole;

[0037] 31- first inclined portion;

[0038] 4-Fuse area;

[0039] 5- groove;

[0040] 6- Avoidance section;

[0041] 7- Secondary battery;

[0042] 71-battery cell;

[0043] 72-pole;

[0044] 73-ear;

[0045] 8-Battery pack;

[0046] 81-battery module;

[0047] 82-housing;

[0048] 9-Energy storage box. DETAILED DESCRIPTION

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] like Figure 1 and Figure 5As shown, an embodiment of the present application provides a connector for a secondary battery 7, which is usually arranged on the top cover of the secondary battery 7, and is used to connect the pole lug 73 and the pole 72 of the battery cell 71, so as to facilitate the circuit connection between the external device and the battery. The secondary battery connector includes a connecting portion 1, a fuse hole 3, a fuse portion 2 and a groove 5. The connecting portion 1 is a portion for connecting the pole lug 73 and the pole 72. Specifically, the connecting portion 1 includes a first connecting portion 11 and a second connecting portion 12. Along the width direction of the secondary battery connector, the second connecting portion 12 is located on both sides of the first connecting portion 11. As shown in the figure, the X direction is the length direction of the secondary battery connector, and the Y direction is the width direction of the secondary battery connector. The two second connecting portions 12 can be respectively connected to the two pole lugs 73 to achieve a converging effect.

[0054] The secondary battery 7 generates heat when working, but when the secondary battery 7 fails due to various reasons, such as a short circuit inside the secondary battery 7, the secondary battery 7 may experience thermal runaway, which may eventually cause the battery to catch fire or even explode. The embodiment of the present application provides a secondary battery 7 connection with a fuse hole 3, and the fuse hole 3 is located between the first connection part 11 and the second connection part 12. The fuse hole 3 penetrates the connection part 1 along the thickness direction of the secondary battery connector to achieve a reduction in the local cross-sectional area and volume of the connection part 1. The cross-sectional shape of the fuse hole 3 can be circular, elliptical, triangular, rectangular or other polygons, etc. The embodiment of the present application does not specifically limit the shape of the fuse hole 3. According to the formula R=ρL / S, the relationship between the cross-sectional area and resistance of the conductor, when the length of the conductor is constant, the smaller the cross-sectional area, the greater the resistance. By setting the fuse hole 3, the local cross-sectional area of ​​the secondary battery connector can be reduced to form a fuse area 4, and the fuse area 4 is the location where the fuse can occur. According to the formula Q=I 2 R, the resistance of the fuse area 4 is greater than the resistance of other areas, and the fuse area 4 has a fuse part 2. When the current is constant, the heat generated by the fuse area 4 is greater than that of other areas, and the temperature is also higher than that of other areas. Therefore, the fuse part 2 can be preferentially melted when the current is too large, so that the first connection part 11 and the second connection part 12 are disconnected, thereby cutting off the conduction of current, avoiding the battery from continuing to heat up and causing accidents, thereby improving the safety and reliability of the battery.

[0055] like Figures 1 to 5As shown, the secondary battery connector provided in the embodiment of the present application also has a groove 5, which extends to the inner side of the secondary battery connector. The groove 5 is located between the first connecting part 11 and the second connecting part 12. The groove 5 is used to reduce the size of the first connecting part 11 in the width direction of the secondary battery connector. The fuse area 4 is located between the fuse hole 3 and the groove 5. Specifically, one end of the groove 5 is located at the edge of the secondary battery connector, and the other end is located inside the secondary battery connector. The fuse area 4 is located between the end of the groove 5 close to the inside of the secondary battery connector and the fuse hole 3, so that the size of the fuse area 4 is smaller, and the fusing efficiency of the fuse part 2 is improved. When the secondary battery 7 fails, it can be more effectively fused, thereby timely cutting off the electrical connection between the first connecting part 11 and the second connecting part 12.

[0056] like Figure 1 As shown, in a possible embodiment, the groove 5 is located on both sides of the first connection part 11 along the width direction of the secondary battery connector, and the groove 5 extends to both sides of the fuse hole 3 along the length direction of the secondary battery. The groove 5 can reduce the width of the first connection part 11. In addition, the provision of the groove 5 can also relatively reduce the size of the fuse part 2. When the fuse part 2 is melted, the melted part extends to both sides along the width direction of the secondary battery connector to the edge of the secondary battery connector and the fuse hole 3, so that the first connection part 11 is separated from the second connection part 12, and the effect of cutting off the current is achieved.

[0057] like Figure 2 As shown, in a possible embodiment, the extension direction of the groove 5 has an angle with the length direction of the secondary battery connector, and is inclined toward the direction close to the fuse hole 3. The distance between the grooves 5 located on both sides of the first connecting portion 11 can be further reduced, so that the length of the fuse portion 2 can be further reduced, reducing the area of ​​the fuse portion 2 that needs to be melted when the fuse takes effect, thereby improving the efficiency of the fuse.

[0058] like Figure 3 and Figure 4 As shown, in a possible embodiment, the size of the fuse hole 3 in the width direction of the secondary battery connector is increased, and the fuse region 4 is located between the fuse hole 3 and the groove 5. When the area of ​​the fuse hole 3 is increased, the area of ​​the fuse region 4 can be shortened, thereby reducing the area of ​​the fuse portion 2. When a fuse occurs, only a smaller area of ​​the fuse portion 2 needs to be melted to achieve the cutting off of the first connection portion 11 and the second connection portion 12.

[0059] like Figure 3 and Figure 4As shown, in a possible embodiment, the end of the fuse hole 3 close to the groove 5 has a first inclined portion 31, and the end of the groove 5 close to the fuse hole 3 has a second inclined portion 21, the first inclined portion 31 and the second inclined portion 21 are respectively located at the edges of the fuse area 4, and the adjacent first inclined portion 31 and the second inclined portion 21 are parallel.

[0060] The secondary battery connector includes two grooves 5. The grooves 5 are respectively located on both sides of the first connecting portion 11 along the width direction of the secondary battery connector. The grooves 5 can extend along the length direction or width direction of the secondary battery connector, or can extend along a relatively inclined direction. The projection of the groove 5 in the thickness direction of the secondary battery connector can be roughly rectangular, and the projection of the fuse hole 3 can also be roughly rectangular, wherein the edge of the groove 5 and the edge of the fuse hole 3 together constitute a part of the edge of the fuse area 4. By setting the parallel first inclined portion 31 and the second inclined portion 21, the edges of the fuse part 2 can be made parallel to each other, so that the width dimensions of each part of the fuse part 2 are kept consistent. When a fuse occurs, each part of the fuse part 2 can be evenly blown, making the blow more stable and effective. The first inclined portion 31 and the second inclined portion 21 can be reasonably set according to actual conditions. For example, only the first inclined portion 31 or the second inclined portion 21 can be set, as long as the width dimensions of the fuse part 2 can be made roughly the same, and the fuse can be stably and evenly blown when it blows.

[0061] like Figure 5 As shown, in a possible implementation manner, the secondary battery connector includes a plurality of fuse holes 3, and the fuse holes 3 are arranged at intervals along the length direction or the width direction of the connector.

[0062] The secondary battery connector provided in the embodiment of the present application is provided with a plurality of fuse holes 3, which can further reduce the area of ​​the fuse portion 2, thereby making it easier for the fuse region 4 to fuse. Specifically, the fuse holes 3 can be arranged at intervals along different directions, and the portion located between adjacent fuse holes 3 can have a smaller size and cross-sectional area, so that the fuse can be blown preferentially during the fuse, thereby improving the efficiency and reliability of the fuse.

[0063] like Figure 2As shown, in a possible implementation, the distance between the groove 5 and the fuse hole 3 is D, and 6mm≤D≤9mm. For example, D can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, etc. The embodiment of the present application controls the size of the fuse area 4 and the fuse part 2 by controlling the distance between the fuse hole 3 and the groove 5, so that the structure of the secondary battery connector is more reasonable. The secondary battery connector needs to assume the functions of current convergence and battery transmission when working normally, and the fuse part 2 also needs to realize the conduction of normal current. Therefore, setting a reasonable size can ensure the stable operation of the secondary battery 7 when working normally, and can also work normally when the secondary battery 7 is working with a large current. Therefore, the secondary battery connector provided in the embodiment of the present application can not only work normally when the current is large, but also can be timely melted and cut off the current when a fault short circuit occurs.

[0064] In a possible implementation, the thickness of the fuse part 2 is smaller than the connection part 1. By setting the thickness of the fuse part 2, the cross-sectional area and volume of the fuse part 2 can be reduced. When the secondary battery 7 fails, the fuse part 2 can reach the fusing temperature more quickly and fuse at a faster speed, so that the first connection part 11 and the second connection part 12 are disconnected, and finally the protection function is realized quickly and stably.

[0065] like Figure 2 As shown, in a possible implementation manner, the secondary battery connector includes a plurality of fuse parts 2, and along the width direction of the secondary battery connector, the fuse parts 2 are respectively located on both sides of the fuse hole 3.

[0066] Arranging multiple fuses 2 can make the fuse area 4 start to fuse from different positions at the same time, so that the fuses 2 are more uniform and stable when they fuse. Specifically, when the secondary battery 7 fails, the fuses 2 arranged on both sides of the fuse hole 3 can fuse at the same time, and the fuses 2 on both sides fuse in the direction close to the fuse hole 3 respectively until they fuse to the position where the fuse hole 3 is located, so that the first connection part 11 and the second connection part 12 are completely disconnected, and the current is cut off, so as to prevent the secondary battery 7 from overheating and catching fire more seriously.

[0067] like Figure 6 As shown, in a possible implementation, the thickness of the fuse part 2 is H1, the thickness of the connection part 1 is H2, and 0.2≤H1 / H2≤0.5 is satisfied. For example, H1 / H2 can be 0.2, 0.3, 0.4, 0.5, etc., and the ratio of the thickness of the fuse part 2 and the connection part 1 can be flexibly and reasonably set according to actual needs.

[0068] The thickness of the fuse part 2 affects the fusing speed of the fuse part 2. The fuse part 2 provided in the embodiment of the present application gives the relationship between the thickness of the fuse part 2 and the thickness of the connecting part 1, so that the fuse part 2 can have good current transmission capability and can also be blown in time when the secondary battery 7 fails, thereby improving the safety of the secondary battery 7.

[0069] like Figures 1 to 4 As shown, in a possible implementation, the secondary battery connector has an avoidance portion 6, which is located on a side of the first connection portion 11 where the second connection portion 12 is not provided, and the recessed portion extends toward the inside of the secondary battery connector.

[0070] The avoidance portion 6 is an area recessed toward the first connecting portion 11. Usually, the secondary battery connector is arranged in the top cover assembly, and the top cover assembly also includes other structures, such as an exhaust valve and a liquid injection port. By setting the avoidance portion 6, other structures can be avoided to avoid blocking other structures or interfering with other structures, thereby improving the compatibility of the secondary battery connector.

[0071] like Figure 7 As shown, an embodiment of the present application provides a secondary battery 7, which includes a battery cell 71, a pole 72 and a secondary battery connector. The battery cell 71 has a pole ear 73, the pole 72 is connected to the first connecting portion 11, the pole ear 73 is connected to the second connecting portion 12, and the secondary battery connector is the secondary battery connector described in any of the above embodiments.

[0072] The battery cell 71 is the core component of the secondary battery 7 for electrochemical reactions. The battery cell 71 is usually formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is arranged between the positive electrode sheet and the negative electrode sheet. During the charging and discharging process of the secondary battery 7, the positive electrode sheet and the negative electrode sheet can undergo corresponding chemical reactions, and a current loop is formed through the pole ear 73, the pole column 72 and the external device circuit connection. Specifically, the pole column 72 is connected to the first connecting part 11, the pole ear 73 is connected to the second connecting part 12 respectively, the secondary battery connector connects the pole ear 73 and the pole column 72, and the external device forms a current loop by connecting with the pole column 72, thereby realizing the utilization of the electric energy of the secondary battery 7. When the battery temperature is too high due to an accident, the secondary battery connector can automatically fuse, thereby cutting off the connection between the pole column 72 and the pole ear 73, thereby cutting off the current loop, and preventing the secondary battery 7 from further heating and causing an accident.

[0073] like Figure 8 As shown, an embodiment of the present application provides a battery pack 8, the battery pack 8 includes a housing 82, a bottom plate and a battery module 81, the battery module 81 includes a plurality of secondary batteries 7, and the secondary battery 7 is the secondary battery 7 described in any of the above embodiments.

[0074] Multiple secondary batteries 7 can be connected in series or in parallel or in a combination of series and parallel to form a battery module 81, and multiple battery modules 81 can be further connected to each other and installed inside the housing 82. Other components, such as a busbar and a connecting part 1, can be provided inside the housing 82 to achieve electrical connection between the battery modules 81. By connecting multiple secondary batteries 7 to each other, the overall capacity of the battery pack 8 can be increased, a higher power discharge function can be achieved, and more actual power needs can be met.

[0075] like Fig. 9 As shown, an embodiment of the present application provides an energy storage box 9, which includes a shell, a battery pack 8, an inverter and a power management system. The battery pack 8 is the battery pack 8 described in any of the above embodiments.

[0076] The energy storage box 9 is a device for energy storage. The energy storage box 9 includes a box body, which is used to accommodate components such as the battery pack 8, the inverter and the power management system. The box body has the function of isolating and protecting the internal components, providing a suitable working environment for the battery pack 8, and maintaining a suitable temperature. The inverter is a converter that converts the DC power of the battery pack 8 into a constant frequency and voltage or frequency-modulated and voltage-regulated AC power, so that external devices can use the power stored in the energy storage box 9. The power management system is a device that cooperates with monitoring the status of the energy storage battery. It is mainly for intelligent management and maintenance of each battery unit, preventing the battery from overcharging and over-discharging, extending the battery life, and monitoring the battery status.

[0077] The embodiment of the present application provides a secondary battery connector, a secondary battery, a battery pack and an energy storage box. The secondary battery connector includes a connecting part 1, a fuse hole 3 and a fuse part 2. The connecting part 1 includes a first connecting part 11 and a second connecting part 12. Along the width direction of the secondary battery connector, the second connecting part 12 is located on both sides of the first connecting part 11. The fuse hole 3 penetrates the connecting part 1 along the thickness direction of the secondary battery connector. Along the width direction of the secondary battery connector, the fuse hole 3 is located between the first connecting part 11 and the second connecting part 12. The position between the fuse hole 3 and the connecting part 1 forms a fuse area 4. The fuse part 2 is located in the fuse area 4. The groove 5 is located between the first connecting part 11 and the second connecting part 12. The groove 5 extends to the inner side of the secondary battery connector. The secondary battery connector provided in the embodiment of the present application can be melted when a battery failure occurs, thereby realizing the function of protecting the battery and improving the safety and reliability of the battery.

[0078] 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 connector, characterized in that: The secondary battery connector comprises: A connecting portion (1), the connecting portion (1) comprising a first connecting portion (11) and a second connecting portion (12), wherein the second connecting portion (12) is located on both sides of the first connecting portion (11) along the width direction of the secondary battery connecting piece; A groove (5), the groove (5) being located between the first connecting portion (11) and the second connecting portion (12), and the groove (5) extending toward the inner side of the secondary battery connecting member; a fuse hole (3), the fuse hole (3) penetrating the connection part (1) along the thickness direction of the secondary battery connector, the fuse hole (3) being located between the first connection part (11) and the second connection part (12) along the width direction of the secondary battery connector, and a fuse area (4) being formed between the fuse hole (3) and the groove (5); A fuse part (2), wherein the fuse part (2) is located in the fuse area (4).

2. The secondary battery connector according to claim 1, characterized in that: One end of the fuse hole (3) close to the groove (5) has a first inclined portion (31), and one end of the groove (5) close to the fuse hole (3) has a second inclined portion (21), and the adjacent first inclined portion (31) and second inclined portion (21) are parallel.

3. The secondary battery connector according to claim 1, characterized in that: The secondary battery connector comprises a plurality of the fuse holes (3), and the fuse holes (3) are arranged at intervals along the length direction or the width direction of the secondary battery connector.

4. The secondary battery connector according to claim 1, characterized in that: The distance between the groove (5) and the fuse hole (3) is D, and 6mm≤D≤9mm.

5. The secondary battery connector according to claim 1, characterized in that: Along the thickness direction of the secondary battery connector, the thickness of the fuse part (2) is smaller than that of the connecting part (1).

6. The secondary battery connector according to claim 1, characterized in that: The secondary battery connector comprises a plurality of fuse parts (2), and along the width direction of the connector, the fuse parts (2) are respectively located on both sides of the fuse hole (3).

7. The secondary battery connector according to claim 5, characterized in that: The thickness of the fuse portion (2) is H1, the thickness of the connection portion (1) is H2, and 0.2≤H1 / H2≤0.5 is satisfied.

8. The secondary battery connector according to any one of claims 1 to 7, characterized in that: The secondary battery connector has an avoidance portion (6), the avoidance portion (6) is located on a side of the first connecting portion (11) where the second connecting portion (12) is not provided, and the avoidance portion (6) extends toward the inside of the secondary battery connector.

9. A secondary battery (7), characterized in that: The secondary battery (7) comprises a battery cell (71), a pole (72) and a secondary battery connector, the battery cell (71) has a pole lug (73), the pole (72) is connected to the first connecting portion (11), the pole lug (73) is connected to the second connecting portion (12), and the secondary battery connector is the secondary battery connector according to any one of claims 1 to 8.

10. A battery pack (8), characterized in that: The battery pack (8) comprises a plurality of battery modules (81) and a housing (82); the battery modules (81) comprise a plurality of secondary batteries (7); and the secondary batteries (7) are the secondary batteries (7) according to claim 9.

11. An energy storage box (9), characterized in that: The energy storage box (9) comprises a housing, a battery pack (8) inverter and a power management system, and the battery pack (8) is the battery pack (8) according to claim 10.

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