Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage equipment, particularly provides a battery pack and an energy storage system, and aims to solve the problems that the temperature rise of a copper bar at a plug-in panel of the conventional battery pack is too high and the temperature of a battery cell is too high. In order to achieve the purpose, the battery pack provided by the utility model comprises a plug-in panel assembly, an anode connecting copper bar, a liquid cooling plate and a battery module, the plug-in panel assembly comprises a positive plug-in and a negative plug-in; one end of the anode connecting copper bar is connected with the anode plug-in, and the other end of the anode connecting copper bar is connected with the anode of the battery module; and at least one part of the positive electrode connecting copper bar extends towards the liquid cooling plate to form a first extension part. According to the utility model, the temperature rise of the positive electrode connecting copper bar at the panel of the battery pack plug-in can be prevented from being too high, and the temperature of the battery cell of the battery module connected with the positive electrode connecting copper bar can be prevented from being too high.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, and specifically provides a battery pack and an energy storage system. Background Art

[0002] With the rapid development of the energy storage market, the demand for high-power or even ultra-high-power discharge of the supporting battery cells in the energy storage market is also continuously increasing. High-power energy storage products have large currents, and the heat generation of the entire system is high. The selection of electrical components and the thermal management design are extremely challenging; especially for the copper bars at the plug-in panel of the battery pack, due to the small space, a large number of copper bars, and poor heat dissipation conditions, the temperature rise of the copper bars is very high.

[0003] The current solution is to add temperature monitoring points at the positive connection copper bar and the negative connection copper bar respectively, and the battery management system BMS sets a control strategy. When the temperature rise of the copper bar is too high, the BMS issues an alarm to reduce the power or even a shutdown command to prevent the heat from being transferred to the battery cells due to the too high temperature rise of the copper bar, and to avoid the too high temperature of the battery cells or even the thermal runaway of the battery cells.

[0004] However, in the above-mentioned existing technical solutions, when the temperature rise is too high, the full-power operation process of the battery pack will be forced to interrupt, affecting the use effect.

[0005] Based on the problems existing in the above-mentioned existing technologies, those skilled in the art urgently need a battery pack and an energy storage system to effectively reduce the temperature rise of the copper bars and the battery cells. Summary of the Utility Model

[0006] The utility model aims to solve the above technical problems, that is, to solve the problems of too high temperature rise of the copper bars at the plug-in panel of the existing battery pack and too high temperature of the battery cells.

[0007] In a first aspect, the utility model provides a battery pack, which includes a plug-in panel assembly, a positive connection copper bar, a liquid cooling plate and a battery module; the plug-in panel assembly includes a positive plug and a negative plug; one end of the positive connection copper bar is connected to the positive plug, and the other end is connected to the positive pole of the battery module; at least a part of the positive connection copper bar extends towards the direction of the liquid cooling plate to form a first extension part.

[0008] In the case of adopting the above technical solution, the positive connection copper bar of the utility model extends and lengthens towards the direction of the liquid cooling plate, so that the heat dissipation area of the extended positive connection copper bar increases, and since the heat dissipation effect of the copper bar is better closer to the liquid cooling plate, the first extension part of the positive connection copper bar is closer to the liquid cooling plate to improve the heat dissipation effect. Therefore, the utility model can avoid too high temperature rise of the positive connection copper bar at the plug-in panel of the battery pack, and can avoid too high temperature of the battery cells at the positive pole position of the battery module connected to the positive connection copper bar.

[0009] Further, it further includes a negative connection copper bar, one end of the negative connection copper bar is connected to the negative plug; at least a part of the negative connection copper bar extends towards the direction of the liquid cooling plate to form a second extension part.

[0010] Further, the bottom of the first extension part is in abutting contact with the liquid cooling plate; and / or the bottom of the second extension part is in abutting contact with the liquid cooling plate.

[0011] Further, the liquid cooling plate includes a liquid cooling flow channel and a liquid inlet and a liquid outlet communicated with the liquid cooling flow channel; the liquid cooling plate is configured to enable the fluid entering from the liquid inlet to first flow through the area on the liquid cooling plate corresponding to the positive electrode of the battery module.

[0012] Further, a limiting structure is provided at one end of the positive connection copper bar connected to the positive plug; the limiting structure is used to limit the relative rotation between the positive connection copper bar and the positive plug.

[0013] Further, the plug panel assembly further includes an MSD module, and a protruding structure is provided on the MSD module; the other end of the negative connection copper bar is connected to the MSD module and is in abutting contact with the protruding structure to limit the relative rotation between the negative connection copper bar and the MSD module.

[0014] Further, it further includes a fuse connection copper bar; one end of the fuse connection copper bar is connected to the MSD module and is in abutting contact with the protruding structure to limit the relative rotation between the fuse connection copper bar and the MSD module.

[0015] Further, both the first extension part and the second extension part include a first extension segment, a contact segment and a second extension segment which are connected in sequence from beginning to end; both the first extension segment and the second extension segment extend towards the direction of the liquid cooling plate, and two ends in the length direction of the contact segment are respectively connected to the bottom ends of the first extension segment and the second extension segment; the bottom of the contact segment is in abutting contact with the top of the liquid cooling plate.

[0016] Further, the limiting structure includes a limiting block; the limiting block is in abutting contact with the end face of the positive plug to limit the relative rotation between the positive connection copper bar and the positive plug.

[0017] In a second aspect, the present invention further provides an energy storage system, and the energy storage system includes the above-mentioned battery pack.

[0018] In the case of adopting the above technical solution, the beneficial effects of the present invention are:

[0019] (1) The positive connection copper bar and the negative connection copper bar of the present utility model both extend towards the direction close to the liquid cooling plate. From the design, the length of the copper bar is increased, thereby increasing the heat dissipation area of the copper bar. And the bottom of the extended copper bar is in close contact with the liquid cooling plate, which can improve the heat dissipation effect of the copper bar. That is, the positive connection copper bar of the present utility model contacts the liquid cooling plate through the first extension part, and the negative connection copper bar contacts the liquid cooling plate through the second extension part, which can reduce the temperature rise of the copper bar, and further avoid the too high temperature of the battery cells of the battery module connected to the copper bar.

[0020] (2) The present utility model changes the liquid cooling flow channel of the liquid cooling plate and the positions of the liquid inlet and the liquid outlet. Since the distance between the positive electrode of the battery module and the positive plug is short, the temperature rise of the positive connection copper bar affects the temperature of the battery cells at the positive electrode position of the battery module. The present utility model makes the liquid inlet of the liquid cooling plate located near the positive electrode of the battery module. The fluid entering from the liquid inlet of the liquid cooling plate first cools the battery cells at the positive electrode position of the battery module to improve the heat dissipation effect of the battery cells at the positive electrode position of the battery module and reduce the temperature rise. And the negative electrode of the battery module is near the liquid outlet of the liquid cooling plate. Since the distance between the negative electrode of the battery module and the negative plug is long, the influence of the temperature rise of the copper bar on the temperature of the battery cells at the negative electrode of the battery module is small. The temperature of the battery cells at the negative electrode position of the battery module will not be too high after being cooled by the liquid cooling plate. Thus, the present utility model can take into account reducing the temperatures of the battery cells at the positive electrode position and the negative electrode position of the battery module, and avoid the situation of too high temperature rise of the module battery cells.

[0021] (3) The present utility model sets a limiting structure at one end of the positive connection copper bar connected to the positive plug. After the positive connection copper bar and the positive plug are connected by fasteners, this limiting structure can limit the relative rotation between the positive connection copper bar and the positive plug, and further avoid the loosening of the connection between the two during transportation or installation, thereby avoiding the problem of too high temperature rise of the copper bar caused by poor contact between the positive connection copper bar and the positive plug.

[0022] (4) The negative connection copper bar of the present utility model abuts and limits against the middle protruding structure of the MSD module to avoid relative rotation, and the fuse connection copper bar abuts and limits against the middle protruding structure of the MSD module to avoid relative rotation. Thus, the present utility model can avoid the problem of loose connection between the negative connection copper bar, the fuse connection copper bar and the MSD module during transportation or installation, and further avoid the problem of too high temperature rise of the copper bar caused by poor contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present utility model will be described below with reference to the drawings, in which:

[0024] Figure 1 is a schematic connection diagram of a plug panel assembly and a copper bar of the prior art;

[0025] Figure 2 It is a schematic diagram of the overall structure of the battery pack of the present utility model;

[0026] Figure 3 It is a schematic diagram of the connection between the plug-in panel assembly and the copper busbar of the present utility model;

[0027] Figure 4 It is a schematic diagram of the connection between the copper busbar and the battery module of the present utility model.

[0028] List of reference numerals:

[0029] 1 - Plug-in panel assembly; 2 - Positive connection copper busbar; 3 - Negative connection copper busbar; 4 - Fuse connection copper busbar; 5 - Liquid cooling plate; 6 - Battery module; 7 - Fuse; 8 - Battery pack upper cover; 9 - Slave control cover plate; 10 - Fastener; 11 - Positive plug; 12 - Negative plug; 13 - MSD module; 21 - First extension part; 22 - Limit structure; 31 - Second extension part; 51 - Liquid inlet; 52 - Liquid outlet. Detailed implementation manners

[0030] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The illustrated embodiments are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0031] It should be noted that in the description of the present utility model, the terms indicating the direction or positional relationship such as "upper", "lower", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Such as Figure 1The figure shows a schematic connection diagram of a plug-in panel component 1` and a busbar in the prior art. Among them, the two ends of the positive connection busbar 2` are respectively connected to the positive plug 11` and the positive electrode of the battery module. The two ends of the negative connection busbar 3` are respectively connected to the negative plug 12` and the MSD module 13`. The two ends of the fuse connection busbar 4` are respectively connected to the MSD module 13` and the fuse 7`.

[0034] Continue to refer to Figure 1 , in the prior art, the short lengths of the positive connection busbar 2` and the negative connection busbar 3` are not conducive to heat dissipation. Especially, the distance between the positive electrode of the battery module and the positive plug 11` is short. The excessive temperature rise of the positive connection busbar 2` will transfer heat to the battery cells at the positive electrode position of the battery module, resulting in too high a temperature of the battery cells in the battery module. And in the prior art, the positive electrode of the battery module is near the liquid outlet of the liquid cooling plate, and the negative electrode of the battery module is near the liquid inlet of the liquid cooling plate, making the battery cells at the positive electrode position of the battery module usually have a higher temperature than those at the negative electrode position.

[0035] Furthermore, in the prior art, since the plug-in panel component 1` is not fixed before the installation of the battery pack upper cover, the installation process of the battery pack upper cover will push the plug-in panel component 1`, resulting in relative rotation between the busbar and the plug-in panel component 1`, and further causing the fasteners at the connection position to loosen. In addition, the vibration during the installation process and transportation process of the battery pack in the energy storage system will also cause the connection between the busbar and the plug-in panel component 1` to loosen, resulting in poor contact and too high a temperature rise of the busbar.

[0036] To solve the problems of too high a temperature rise of the busbar and too high a temperature of the battery cells in the above prior art, as Figures 2 to 4 shown, an embodiment of the present invention discloses a battery pack, in which Figure 2 shows a schematic diagram of the overall structure of the battery pack, including a battery pack upper cover 8, a plug-in panel component 1, a slave control cover plate 9, and the liquid inlet 51 and liquid outlet 52 of the liquid cooling plate 5. Figure 3 is a schematic connection diagram of the plug-in panel component 1, the fuse 7 and the busbar after removing the battery pack upper cover 8 and the battery module 6; Figure 4 is a schematic connection diagram of the busbar and the battery module 6 after removing the battery pack upper cover 8.

[0037] The plug-in panel component 1 of the battery pack of the present invention includes a positive plug 11, a negative plug 12 and a maintenance switch circuit breaker MSD module 13. The battery module 6 includes a plurality of battery cells and has a total positive electrode and negative electrode. The plug-in panel component 1 is arranged near the positive electrode position of the battery module 6. The liquid cooling plate 5 is in close contact with the bottom of the battery module 6 for cooling and heat dissipation.

[0038] Refer to Figure 3, both ends of the positive electrode connecting copper bar 2 are respectively connected to the positive electrode plug 11 and the positive electrode of the battery module 6, both ends of the negative electrode connecting copper bar 3 are respectively connected to the negative electrode plug 12 and the MSD module 13, and both ends of the fuse connecting copper bar 4 are respectively connected to the MSD module 13 and the fuse 7.

[0039] The positive electrode connecting copper bar 2 of the present utility model has a first extension portion 21 extending in the direction towards the liquid cooling plate 5. Specifically, the first extension portion 21 extends downward. Thus, the length of the positive electrode connecting copper bar of the present utility model is extended, and correspondingly, the heat dissipation area is increased. At the same time, since the first extension portion 21 is closer to the liquid cooling plate 5, the heat dissipation effect of the copper bar is better.

[0040] In a specific embodiment, the bottom of the first extension portion 21 is in contact with and fits the liquid cooling plate 5 to further improve the cooling and heat dissipation effect of the positive electrode connecting copper bar 2 through the liquid cooling plate 5.

[0041] The negative electrode connecting copper bar 3 of the present utility model has a second extension portion 31 extending in the direction towards the liquid cooling plate 5. Specifically, the second extension portion 31 extends downward. Thus, the length of the negative electrode plug connecting copper bar 3 of the present utility model is extended, and correspondingly, the heat dissipation area is increased. At the same time, since the second extension portion 31 is closer to the liquid cooling plate 5, the heat dissipation effect of the copper bar is better.

[0042] In a specific embodiment, the bottom of the second extension portion 31 is in contact with and fits the liquid cooling plate 5 to further improve the heat dissipation effect of the negative electrode connecting copper bar 3 through the liquid cooling plate 5.

[0043] It should be noted that those skilled in the art can specifically set the extension structures of the positive electrode connecting copper bar 2 and the negative electrode connecting copper bar 3, and as long as the technical solutions that extend the lengths of the positive electrode connecting copper bar 2 and the negative electrode connecting copper bar 3 in the direction towards the liquid cooling plate 5 are within the protection scope of the present utility model.

[0044] As a preferred implementation manner of the present utility model, refer to Figure 2 , the liquid cooling plate 5 includes a liquid inlet 51, a liquid outlet 52, and a liquid cooling flow channel provided inside the liquid cooling plate 5. The fluid enters the liquid cooling flow channel from the liquid inlet 51, the pipeline flowing through the liquid cooling flow channel cools and dissipates heat from the battery module 6, and then flows out from the liquid outlet 52.

[0045] The liquid inlet 51 of the liquid cooling plate 5 of the present utility model is arranged close to the positive electrode position of the plug panel assembly 1 and the battery module 6, and the liquid outlet 52 of the liquid cooling plate 5 is arranged close to the negative electrode position of the battery module 6. The fluid entering from the liquid inlet 51 first flows through the area corresponding to the positive electrode of the battery module 6 on the liquid cooling plate 5, and then flows through the area corresponding to the negative electrode of the battery module 6 on the liquid cooling plate 5.

[0046] By changing the liquid cooling channels of the liquid cooling plate 5 and the positions of the liquid inlet 51 and the liquid outlet 52, the present utility model can reduce the temperature of the battery cells at the positive electrode position of the battery module 6; and since the negative electrode of the battery module 6 is far from the copper busbar, the temperature rise of the copper busbar has little effect on the temperature of the battery cells at the negative electrode position of the battery module 6, and the temperature of the battery cells at the negative electrode position of the battery module 6 will not be too high after being cooled and dissipated heat by the liquid cooling plate 5; that is, the present utility model can make the temperatures of the battery cells at the positive electrode position and the negative electrode position of the battery module 6 not too high, so as to avoid the situation that the full-power operation of the battery pack is forced to be interrupted due to excessive temperature rise of the battery cells.

[0047] And it should be noted that those skilled in the art can specifically set the liquid cooling channels of the liquid cooling plate 5 and the positions of the liquid inlet 51 and the liquid outlet 52. The present utility model does not make specific limitations, as long as the effect that the fluid entering the liquid cooling plate 5 first cools the battery cells at the positive electrode position of the battery module 6 can be achieved.

[0048] As a preferred embodiment of the present utility model, as Figure 3 and Figure 4 shown, a limiting structure 22 is provided at one end of the positive electrode connecting copper busbar 2, and the limiting structure 22 is used to limit the relative rotation between the positive electrode connecting copper busbar 2 and the positive electrode plug 11; specifically, the limiting structure 22 and the tail end of the positive electrode plug 22 are connected by a fastener 10, and the limiting structure 22 includes a limiting block, and the limiting block abuts against the end face of the tail end of the positive electrode plug 22 for limiting.

[0049] By providing the limiting structure 22, the present utility model can prevent the connection between the positive electrode connecting copper busbar 2 and the positive electrode plug 11 from loosening, that is, it can avoid the problem of excessive temperature rise of the copper busbar caused by poor contact between the positive electrode connecting copper busbar 2 and the positive electrode plug 11.

[0050] And it should be noted that those skilled in the art can set the limiting structure 22 according to the actual situation. The present utility model does not make specific limitations, as long as the effect of restricting the relative rotation between the positive electrode connecting copper busbar 2 and the positive electrode plug 11 can be achieved.

[0051] As a preferred embodiment of the present utility model, referring to Figure 3 , a protruding structure is provided in the middle of the MSD module 13, and one end of the negative electrode connecting copper busbar 3 abuts against and is limited by the protruding structure in the middle of the MSD module 13 to limit their relative rotation; and one end of the fuse connecting copper busbar 4 abuts against and is limited by the protruding structure in the middle of the MSD module 13 to limit their relative rotation.

[0052] The negative connection copper bar 3 and the fuse connection copper bar 4 of the present utility model are both in contact with and limited by the middle protruding structure of the MSD module, which can prevent the connection between the copper bar and the MSD module 13 from loosening, that is, it can avoid the problem of excessive temperature rise of the copper bar caused by poor contact between the copper bar and the MSD module 13.

[0053] As a preferred embodiment of the present utility model, continue to refer to Figure 3 , the structures of the first extension part 21 and the second extension part 31 are basically the same, and both include a first extension section, a contact section, and a second extension section that are connected in sequence from beginning to end;

[0054] Among them, both the first extension section and the second extension section extend downward in the direction of the liquid cooling plate 5, and both ends of the contact section in the length direction are connected to the bottom ends of the first extension section and the second extension section; the bottom of the contact section is in contact with the liquid cooling plate 5 for cooling and heat dissipation.

[0055] Specifically, the contact section of the first extension part 21 is horizontally arranged, the first extension section of the first extension part 21 has an inverted L-shaped structure and is used to connect with the positive electrode plug 11, and the second extension section of the first extension part 21 is vertically arranged and is used to connect with the positive electrode of the battery module 6;

[0056] The contact section of the second extension part 31 is horizontally arranged, the first extension section of the second extension section 31 has an inverted Z-shaped structure and is used to connect with the MSD module 13, and the second extension section of the second extension part 31 is vertically arranged and is used to connect with the negative electrode plug 12.

[0057] In a specific embodiment, the first extension section, the contact section, and the second extension section are integrally arranged, and the connection parts of the first extension section, the contact section, and the second extension section are formed by bending and folding.

[0058] The present utility model increases the heat dissipation area of the copper bar by setting the extended structures of the positive connection copper bar 2 and the negative connection copper bar 3, and both the first extension part 21 and the second extension part 31 are in contact with the liquid cooling plate 5, improving the heat dissipation effect.

[0059] Moreover, the present utility model changes the liquid cooling flow path of the liquid cooling plate 5 and the positions of the liquid inlet 51 and the liquid outlet 52, which can avoid excessive temperature rise of the battery cells at the positive electrode position and the negative electrode position of the battery module 6.

[0060] And the present utility model can avoid the problems of poor contact and excessive temperature rise caused by loosening of the connection between the positive connection copper bar 2 and the positive electrode plug 11 by setting the limiting structure 22; and the edges of the negative connection copper bar 3 and the fuse connection copper bar 4 are both in contact with and limited by the middle protruding structure of the MSD module 13, which can avoid the problems of poor contact and excessive temperature rise caused by loosening of the connection between the copper bar and the MSD module 13.

[0061] An embodiment of the present utility model also discloses an energy storage system, including the above-mentioned battery pack.

[0062] It should be noted that the above-mentioned implementation manners are only used to illustrate the principle of the present utility model, and are not intended to limit the protection scope of the present utility model. Without departing from the principle of the present utility model, those skilled in the art can adjust the above methods so that the present utility model can be applied to more specific application scenarios.

[0063] For example, in an alternative implementation manner, the structure of the positive connection busbar 2 can also be set such that both ends of the positive connection busbar 2 are respectively connected to the positive electrode plug 11 and the positive electrode of the battery module 6, and the middle part of the positive connection busbar 2 has a structure extending downward and contacting the liquid cooling plate 5; the structure of the negative connection busbar 3 can also be set such that both ends of the negative connection busbar 3 are respectively connected to the negative electrode plug 12 and the MSD module 13, and the middle part of the negative connection busbar 3 has a structure extending downward and contacting the liquid cooling plate 5.

[0064] For example, in an alternative implementation manner, a limiting structure can also be provided at one end of the negative connection busbar 3 connected to the MSD module 13 to limit the relative rotation between the two; a limiting structure can also be provided at one end of the fuse connection busbar 4 connected to the MSD module 13 to limit the relative rotation between the two.

[0065] So far, the technical solution of the present utility model has been described in conjunction with the preferred implementation manners shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific implementation manners. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A battery pack, characterized in that, It includes a plug-in panel component (1), a positive connection copper bar (2), a liquid cooling plate (5) and a battery module (6); The plug-in panel component (1) includes a positive plug (11) and a negative plug (12); One end of the positive connection copper bar (2) is connected to the positive plug (11), and the other end is connected to the positive pole of the battery module (6); At least a part of the positive connection copper bar (2) extends towards the direction of the liquid cooling plate (5) to form a first extension part (21).

2. The battery pack according to claim 1, wherein, It further includes a negative connection copper bar (3), and one end of the negative connection copper bar (3) is connected to the negative plug (12); At least a part of the negative connection copper bar (3) extends towards the direction of the liquid cooling plate (5) to form a second extension part (31).

3. The battery pack according to claim 2, characterized in that, The bottom of the first extension part (21) is in abutting contact with the liquid cooling plate (5); and / or The bottom of the second extension part (31) is in abutting contact with the liquid cooling plate (5).

4. The battery pack according to claim 1, wherein The liquid cooling plate (5) includes a liquid cooling flow channel and a liquid inlet (51) and a liquid outlet (52) communicated with the liquid cooling flow channel; The liquid cooling plate (5) is configured to enable the fluid entering from the liquid inlet (51) to first flow through the area on the liquid cooling plate (5) corresponding to the positive pole of the battery module (6).

5. The battery pack according to claim 1, characterized in that, One end of the positive connection copper bar (2) connected to the positive plug (11) is provided with a limiting structure (22); The limiting structure (22) is used to limit the relative rotation between the positive connection copper bar (2) and the positive plug (11).

6. The battery pack according to claim 2, wherein The plug-in panel component (1) further includes an MSD module (13), and a protruding structure is arranged on the MSD module (13); The other end of the negative connection copper bar (3) is connected to the MSD module (13) and abuts against the protruding structure for limiting, so as to limit the relative rotation between the negative connection copper bar (3) and the MSD module (13).

7. The battery pack according to claim 6, characterized in that, It further includes a fuse connection copper bar (4); One end of the fuse connection copper bar (4) is connected to the MSD module (13) and abuts against the protruding structure for limiting, so as to limit the relative rotation between the fuse connection copper bar (4) and the MSD module (13).

8. The battery pack according to claim 3, wherein, Both the first extension part (21) and the second extension part (31) include a first extension segment, a contact segment and a second extension segment which are connected in sequence from beginning to end; Both the first extension segment and the second extension segment extend towards the direction of the liquid cooling plate (5), and both ends of the length direction of the contact segment are respectively connected to the bottom ends of the first extension segment and the second extension segment; The bottom of the contact segment is in abutting contact with the top of the liquid cooling plate (5).

9. The battery pack according to claim 5, characterized in that, The limiting structure (22) includes a limiting block; The limiting block abuts against the end face of the positive plug (11) for limiting, so as to limit the relative rotation between the positive connection copper bar (2) and the positive plug (11).

10. A energy storage system, characterized in that, The energy storage system includes the battery pack according to any one of claims 1-9.

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