Battery pack, energy storage cabinet, and data center

Abstract

Provided in the present application is a battery pack, comprising a cover plate, a case, and a battery module accommodated in the case, wherein the cover plate covers the case; the battery module comprises a plurality of battery cells, every two adjacent battery cells being electrically connected via an aluminum busbar; and the cover plate is provided with a boss on the inner surface facing the case, a thermally conductive pad being provided between the boss and the aluminum busbar. By means of the provision of the boss and the thermally conductive pad between the inner surface of the top cover of the battery pack and the aluminum busbar on the top surface of the battery module, natural heat dissipation of the battery pack is enhanced.

Description

Battery pack, energy storage cabinet and data center

[0001] Cross-reference to related applications

[0002] The present application claims priority from the Chinese patent application No. 202422300441.5 filed on September 19, 2024, and entitled "Battery pack, energy storage cabinet and data center", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0004] In order to solve the problem of global climate change caused by the large use of fossil energy, countries are actively seeking clean energy to replace fossil energy, and wind power and photovoltaic installations continue to grow. Due to the unstable and uneven characteristics of clean energy generation, electrochemical energy storage with advantages of high environmental adaptability, high response speed, high power and high energy density is expected to become the mainstream route of future energy storage. At the same time, higher requirements are put forward for the safety of energy storage products. Among them, thermal safety is one of the most important safety performances of energy storage.

[0005] In practice, the battery pack usually adopts liquid cooling or air cooling heat dissipation mode, which not only increases the heat dissipation cost, but also increases the components and volume of the battery pack, thereby reducing the energy density of the battery pack. How to design a natural heat dissipation battery pack structure becomes a problem to be solved.

[0006] Practical new type content

[0007] The present application provides a battery pack, which enhances the natural heat dissipation of the battery pack by setting a boss and a heat-conducting pad between the inner surface of the top cover of the battery pack and the aluminum row of the top surface of the battery module.

[0008] In a first aspect, the application provides a battery pack, the battery pack comprising a cover plate, a box body, and a battery module contained in the box body, the cover plate covering the box body, the battery module comprising a plurality of battery cells, any two adjacent battery cells in the plurality of battery cells being electrically connected by an aluminum bar, two ends of the aluminum bar being connected to a positive pole of one of the two battery cells and a negative pole of the other battery cell, an inner surface of the cover plate facing the box body being provided with a boss, and a heat-conducting pad being arranged between the boss and the aluminum bar. A large amount of heat is generated during the charging and discharging of the battery cells, and if the heat is concentrated, it may cause the battery pack to burn or explode. The aluminum bar, as a component that bears current in the battery module, is one of the components that generate a large amount of heat. The boss is arranged on the inner surface of the top cover, and the heat-conducting pad is arranged between the aluminum bar and the battery top cover, so that the heat generated by the aluminum bar can be transmitted to the cover plate through the heat-conducting pad and the boss, and then dissipated to the outside of the box body, thereby achieving natural heat dissipation of the battery pack.

[0009] In a possible implementation, in the height direction of the battery pack, the thickness of the cover plate is less than the height of the battery module, and the height of the battery module is less than the height of the box body. This makes the devices inside the battery pack more compact in the height direction, thereby improving the energy density of the battery pack.

[0010] In a possible implementation, the aluminum bar is provided with two grooves, the depth of the grooves is less than or equal to 2 mm, and the projections of the two grooves in the height direction of the battery pack respectively cover the projection of the positive pole of one of the battery cells in the height direction of the battery pack and the projection of the negative pole of the other battery cell in the height direction of the battery pack. The positions of the two grooves of the aluminum bar are arranged opposite to the corresponding poles, so that the thickness of the part where the aluminum bar is welded to the poles is moderate, which can ensure the effect of laser welding of the aluminum bar and the poles, and also prevent the aluminum bar from being electrically broken down due to being too thin.

[0011] In a possible implementation, the openings of the two grooves are respectively directed to the positive pole of one of the battery cells and the negative pole of the other battery cell, one of the two grooves is used to accommodate the positive pole of one of the battery cells, and the other groove is used to accommodate the negative pole of the other battery cell, the gap between the inner wall of one of the grooves and the positive pole of one of the battery cells is less than or equal to 0.5 mm, and the gap between the inner wall of the other groove and the negative pole of the other battery cell is less than or equal to 0.5 mm. The grooves are directed to the poles of the battery cells, and the grooves function to limit the poles, and a certain gap is arranged between the side walls of the grooves and the poles, so that during the assembly of the battery module, the position of the battery cells has a certain floating space due to the compression of the silica gel foam between the battery cells, and a gap is also arranged between the plastic support and the aluminum bar to cooperate with the floating.

[0012] In a possible implementation manner, the battery pack includes a partition plate, an end plate and a battery management unit, the partition plate is used to divide the box body into two compartments, one of which is used to accommodate the battery module, and the other is used to accommodate the battery management unit. An opening is formed in one side wall of the box body, the opening is perpendicular to the cover plate, and the battery management unit is located between the partition plate and the opening. The end plate is buckled to the opening, the end plate is provided with a boss facing the battery management unit, and a heat-conducting pad is arranged between the boss and the single plate of the battery management unit. The single plate of the battery management unit includes some heat-generating devices such as power devices, which can be transmitted to the outside of the end plate through the heat-conducting pad and the second boss, thereby enhancing the heat dissipation effect of the battery management unit.

[0013] In a possible implementation manner, the surface of the cover plate away from the box body is provided with a heat dissipation tooth, and the heat dissipation tooth is arranged opposite to the boss of the cover plate. The heat dissipation tooth can increase the heat dissipation area of the cover plate and improve the natural heat dissipation effect of the cover plate on the battery module.

[0014] In a possible implementation manner, the surface of the end plate away from the battery management unit is provided with a heat dissipation tooth, and the heat dissipation tooth on the end plate is arranged opposite to the boss of the end plate. The heat dissipation tooth can increase the heat dissipation area of the end plate and improve the natural heat dissipation effect of the end plate on the single plate in the battery management unit.

[0015] In a possible implementation manner, the bottom wall of the box body is provided with a heat-conducting adhesive, which is located between the bottom wall of the box body and the bottom surface of the battery module, so that the battery module can be cooled through the bottom wall of the box body.

[0016] In a possible implementation manner, the inner surface of the cover plate is sprayed with insulating paint, which can improve the insulation performance between the cover plate and the battery module, improve the creepage distance between the cover plate and the battery module, and prevent arc and sparking caused by insulation failure of the battery module.

[0017] In a possible implementation manner, the inner surface of the cover plate is provided with a ceramic composite tape, which can improve the insulation performance between the cover plate and the battery module, improve the creepage distance between the cover plate and the battery module, and prevent arc and sparking.

[0018] In a second aspect, the application provides a storage energy cabinet, which includes a cabinet body and a plurality of battery packs as described above located in the cabinet body. The plurality of battery packs are stacked to improve the capacity of the storage energy cabinet.

[0019] In a third aspect, the application provides a data center, which includes a load and a storage energy cabinet as described above, and the storage energy cabinet is used to supply power to the load. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is an exploded view of the structure of the battery pack according to an embodiment of the application;

[0021] Fig. 2 is a structural diagram of an inner surface of a cover plate of a battery pack according to an embodiment of the present application;

[0022] Fig. 3 is a sectional view of a structure of a box of a battery pack according to an embodiment of the present application along a Z direction;

[0023] Fig. 4 is an enlarged diagram of A in Fig. 3;

[0024] Fig. 5 is an exploded view of a structure of a battery module of a battery pack according to an embodiment of the present application;

[0025] Fig. 6 is a structural diagram of an installation of an aluminum bar to a plastic support of a battery pack according to an embodiment of the present application;

[0026] Fig. 7 is a structural diagram of one side of an aluminum bar of a battery pack according to an embodiment of the present application;

[0027] Fig. 8 is a structural diagram of another side of an aluminum bar of a battery pack according to an embodiment of the present application;

[0028] Fig. 9 is a sectional view of a structure of an aluminum bar of a battery pack according to an embodiment of the present application along a Z direction;

[0029] Fig. 10 is an exploded view of another structure of a battery pack according to an embodiment of the present application;

[0030] Fig. 11 is a structural diagram of an inner surface of an end plate of a battery pack according to an embodiment of the present application;

[0031] Fig. 12 is a structural diagram of an outer surface of an end plate of a battery pack according to an embodiment of the present application.

[0032] Reference signs: 200-battery pack; 201-cover plate; 2011-first boss; 2012-inner surface of the cover plate; 2013-outer surface of the cover plate; 2014-first heat dissipation tooth; 202-first heat conduction pad; 203-battery module; 2031-cell; 2032-aluminum bar; 20321-groove; 2033-plastic support; 204-box; 2041-first opening; 2042-second opening; 205-BMU; 2051-single board; 206-separation plate; 207-end plate; 2071-second heat dissipation tooth; 2072-inner surface of the end plate; 2073-outer surface of the end plate; 2074-second boss; 208-second heat conduction pad. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0034] In the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, this application can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0037] Multiple: refers to two or more.

[0038] The term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Similarly, "fixation" should also be interpreted broadly. For example, "fixation" can be direct fixation or indirect fixation through an intermediate medium.

[0039] The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the directions in the accompanying drawings. These directional terms are used to better and more clearly explain and understand the embodiments of this application, and are not intended to explicitly or implicitly suggest that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, etc., and therefore should not be construed as limiting the embodiments of this application.

[0040] The embodiments of this application are described below with reference to the accompanying drawings.

[0041] Generally, in order to increase the capacity of the battery pack, a plurality of battery cells connected in series or in parallel are included in the battery pack. On the one hand, a large amount of heat energy is generated in the battery cells during the charging and discharging process due to the electrochemical reaction, and there is a risk of thermal runaway. On the other hand, the side reaction caused by the electrochemical reaction of the electrolyte in the battery cell can also easily cause thermal runaway. Moreover, ensuring that the battery cell works in an appropriate temperature range not only can prolong the aging life of the battery, but also can reduce the probability of thermal runaway of the battery pack. Therefore, it is particularly important to take timely measures to dissipate heat from the battery cells in the battery pack. At present, the battery pack mainly adopts liquid cooling or air cooling for heat dissipation. However, for the scene of small-capacity battery packs (such as energy storage equipment for data center power supply), setting up a liquid cooling plate or an air cooling device will increase the parts of the battery pack, resulting in an increase in the volume of the battery pack, and also increase the maintenance cost of the battery pack. Therefore, how to design a low-cost natural cooling method for the battery pack has become a problem to be solved.

[0042] The application provides a battery pack 200, the structure of which can refer to the structure explosion view of the battery pack 200 shown in FIG. 1. The battery pack 200 comprises a cover plate 201, a box body 204 and a battery module 203, the battery module 203 is located in the box body 204, the cover plate 201 is arranged on the top opening of the box body 204, and the cover plate 201 seals the box body 204. The box body 204 is provided with a first opening 2041, and the cover plate 201 is buckled on the first opening 2041. The battery module 203 comprises a plurality of battery cells 2031, the plurality of battery cells 2031 are arranged side by side, any two adjacent battery cells 2031 are electrically connected through an aluminum bar 2032, and the two ends of the aluminum bar 2032 are connected to the positive pole column of one of the two battery cells 2031 and the negative pole column of the other battery cell 2031. The inner surface 2012 of the cover plate 201 towards the box body 204 is provided with a first boss 2011, and a heat-conducting pad is arranged between the first boss 2011 and the aluminum bar 2032. The structure and position of the first boss 2011 refer to FIGS. 2-4, FIG. 2 is a structural schematic view of the inner surface 2012 of the cover plate 201, FIG. 3 is a sectional view of the structure of the box body 204 along the Z direction, the Z direction is the height direction of the battery pack 200, and FIG. 4 is an enlarged schematic view of A in FIG. 3. The aluminum bar 2032 is used for electrically connecting the positive pole columns and the negative pole columns of the two adjacent battery cells 2031, and has a current passing effect. When the battery pack 200 is in the charging and discharging process, the aluminum bar 2032 is one of the larger heat generating elements of the battery pack 200 due to the current passing through it. Since the aluminum bar 2032 is installed in a plastic support 2033, the side wall of the plastic support 2033 is higher than the upper surface of the aluminum bar 2032. There is a gap between the cover plate 201 and the upper surface of the aluminum bar 2032, which is not conducive to heat dissipation. Therefore, the inner surface 2012 of the cover plate 201 is provided with the first boss 2011 towards the aluminum bar 2032, and the first heat-conducting pad 202 is arranged between the first boss 2011 and the aluminum bar 2032, the heat conductivity coefficient of the first heat-conducting pad 202 can be between 2.8-3.5 w / mk, the heat generated by the aluminum bar 2032 can be transmitted to the cover plate 201 through the first heat-conducting pad 202 and the first boss 2011 in time, and then dissipated to the outside of the box body 204, thereby achieving natural heat dissipation of the battery pack 200. It should be noted that the first boss 2011 and the cover plate 201 can be an integral piece, which can be made by an integral molding process. The first heat-conducting pad 202 is an elastic heat-conducting pad. After the battery module 203 is assembled and the first heat-conducting pad 202 is pasted on the surface of the aluminum bar 2032, the battery module 203 is installed into the box body 204, and then the cover plate 201 is arranged on the box body 204. Since the first heat-conducting pad 202 is elastic, the cover plate 201 compresses the heat-conducting pad, so that there is no gap between the first heat-conducting pad 202 and the cover plate 201, and the heat dissipation capacity of the battery pack 200 is further enhanced.

[0043] To further enhance the heat dissipation effect of the cover plate 201 on the battery cell 2031, a first heat dissipation tooth 2014 can be provided on the outer surface 2013 of the cover plate 201. The structure of the first heat dissipation tooth 2014 is shown in FIG. 4, and the first heat dissipation tooth 2014 is arranged opposite to the first boss 2011 of the cover plate 201. The provision of the first heat dissipation tooth 2014 can increase the heat dissipation area and improve the heat dissipation effect.

[0044] It should be understood that in the Z direction, the thickness of the cover plate 201 is less than the height of the battery module 203, and the height of the battery module 203 is less than the height of the box 204. This makes the devices inside the battery pack 200 more compact in the height direction, thereby improving the energy density of the battery pack 200

[0045] In practice, the positive and negative pole columns of the battery cell 2031 are usually arranged on the top surface of the battery cell 2031. A plastic bracket 2033 is arranged on the top surface of the battery module 203. The structure of the plastic bracket 2033 is shown in the structural explosion diagram of the battery module 203 shown in FIG. 5 and the structural diagram of the aluminum bar 2032 mounted to the plastic bracket 2033 shown in FIG. 6. The plastic bracket 2033 is used to limit the aluminum bar 2032, and then the aluminum bar 2032 is connected to the pole column of the battery cell 2031 by laser welding. On the one hand, due to the limitation of the welding process, the aluminum bar 2032 cannot be too thick, otherwise it will not be able to be welded with the pole column of the battery cell 2031. In this embodiment, the thickness h1 of the aluminum bar 2032 can be designed to be less than or equal to 3.5 mm. On the other hand, since the aluminum bar 2032 also has the function of current flow, the aluminum bar 2032 also cannot be set too thin, otherwise it will cause the problem of aluminum bar 2032 being broken by a large current. Therefore, two grooves 20321 can be provided on the aluminum bar 2032. The structure thereof can be referred to the structural diagram of one side of the aluminum bar 2032 shown in FIG. 7 and the structural cross-sectional view of the aluminum bar 2032 in the Z direction shown in FIG. 9. The depth h2 of the two grooves 20321 is less than or equal to 2 mm. The projections of the two grooves 20321 in the Z direction respectively cover the projection of the positive pole column of one of the battery cells 2031 in the Z direction and the projection of the negative pole column of the other battery cell 2031 in the Z direction. The Z direction is the direction in which the cover plate 201 is arranged on the box 204. The positions of the two grooves 20321 are opposite to the corresponding welded pole columns, which ensures that the thickness of the part of the aluminum bar 2032 welded with the pole column is moderate, which can not only ensure the effect of laser welding of the aluminum bar 2032 and the pole column, but also prevent the phenomenon of current breakdown of the aluminum bar 2032 due to being too thin. The two grooves 20321 can be arranged towards the pole column or away from the pole column. The back surface of the aluminum bar 2032 which is not provided with the groove 20321 can be referred to the structural diagram of the other side of the aluminum bar 2032 shown in FIG. 8.

[0046] When laser welding the aluminum row 2032 and the pole column, the problem of alignment occurs. If the aluminum row 2032 and the battery cell 2031 are misaligned, the welding area may be reduced, resulting in a false weld, which in turn reduces the flow area and increases the risk of thermal runaway. Therefore, two grooves 20321 can be provided on the aluminum row 2032, the openings of the two grooves 20321 respectively face the positive pole column of one of the battery cells 2031 and the negative pole column of the other battery cell 2031, one of the two grooves 20321 is used to accommodate the positive pole column of one of the battery cells 2031, and the other groove 20321 is used to accommodate the negative pole column of the other battery cell 2031. In this way, the two grooves 20321 can limit the position of the battery cell 2031 and avoid misalignment during laser welding. The gap between the inner wall of one of the grooves and the positive pole column of one of the battery cells 2031 is less than or equal to 0.5mm, and the gap between the inner wall of the other groove and the negative pole column of the other battery cell 2031 is less than or equal to 0.5mm, which can provide a certain floating space for the position of the battery cell 2031 when the silica gel foam between the battery cells 2031 is compressed during the assembly of the battery module, and a gap less than or equal to 0.5mm is also provided between the plastic support 2033 and the aluminum row 2032 to cooperate with the floating.

[0047] With reference to another structure of the battery pack 200, as shown in the exploded view of FIG. 10. The battery pack 200 further comprises a BMU 205 (Battery Management Unit), which is electrically connected with the battery module 203, for intelligently managing and maintaining each battery cell 2031, preventing overcharging and over-discharging of the battery, prolonging the service life of the battery, and monitoring the state of the battery. The BMU 205 can also serve as a communication unit of the battery pack 200. On one hand, the top surface of each battery cell 2031 is provided with a sampling device, such as an NTC (Negative Temperature Coefficient) thermistor, or a temperature sensor, or a voltage sensor, and a sampling line is connected with the sampling device and the BMU 205, so that the BMU 205 can obtain the working state of the battery cell 2031, and then send information to the upper-level management system, and for the same reason, the BMU 205 can also receive information from other communication systems. In order to achieve electrical isolation between the battery module 203 and the single board 2051 of the BMU 205, the battery pack 200 comprises a partition plate 206 and an end plate 207. The partition plate 206 is used to divide the box body 204 into two compartments, one of which is used to accommodate the battery module 203, and the other of which is used to accommodate the battery management unit. That is, the partition plate 206 is located between the battery module 203 and the BMU 205, one side wall of the box body 204 is provided with a second opening 2042 which is perpendicular to the cover plate 201, the battery management unit is located between the partition plate 206 and the second opening 2042, and the end plate 207 is buckled on the second opening 2042. The inner surface 2072 of the end plate 207 faces the single board 2051 of the BMU 205. Referring to the structural schematic view of the inner surface 2072 of the end plate 207 shown in FIG. 11, the inner surface 2072 of the end plate 207 is provided with a second boss 2074 facing the battery management unit, and a second thermal pad 208 is arranged between the second boss 2074 and the single board 2051 of the battery management unit. The thermal conductivity of the second thermal pad 208 can be between 2.8-3.5 w / mk. The single board 2051 of the battery management unit comprises some power devices and other heat generating devices, which can be transmitted to the outside of the end plate 207 through the second thermal pad 208 and the second boss 2074, thereby enhancing the heat dissipation effect of the BMU 205. For the same reason, the second thermal pad 208 is an elastic thermal pad, so that there is no gap between the second thermal pad 208 and the second boss 2074.

[0048] It should be understood that the surface of the end plate 207 away from the battery management unit can also be provided with a second heat dissipation tooth 2071. The structure thereof can refer to the structural schematic view of the outer surface 2073 of the end plate 207 shown in FIG. 12. The second heat dissipation tooth 2071 on the end plate 207 is arranged opposite to the second boss 2074 of the inner surface of the end plate 207. The arrangement of the second heat dissipation tooth 2071 can increase the heat dissipation area and improve the heat dissipation effect.

[0049] Further, the bottom wall of the box body 204 can be provided with a heat-conducting glue between the bottom wall of the box body 204 and the bottom surface of the battery module 203, and the heat-conducting coefficient of the heat-conducting glue is between 2.8 and 3.5 w / mk. The bottom surface of the battery module 203 and the bottom wall of the box body 204 are provided with the heat-conducting glue, and the heat generated by the battery module 203 can be transmitted to the outside of the box body 204 in time through the bottom wall of the box body 204, thereby enhancing the heat dissipation capacity of the battery pack 200.

[0050] Since the cover plate 201 of the battery pack 200 is a metal cover plate 201, in order to ensure the insulation effect between the battery module 203 and the cover plate 201, the inner surface 2012 of the cover plate 201 can be sprayed with insulating paint, and the insulating paint can be selected from high-temperature-resistant nano composite ceramic-based insulating protective paint.

[0051] Since the cover plate 201 of the battery pack 200 is a metal cover plate 201, in order to ensure the insulation effect between the battery module 203 and the cover plate 201, the inner surface 2012 of the cover plate 201 can be provided with a coated ceramic composite belt.

[0052] Based on the same inventive concept, the present application provides an energy storage cabinet, which comprises a cabinet body and a plurality of battery packs 200 as described above arranged in the cabinet body, and the plurality of battery packs 200 are stacked to improve the capacity of the energy storage cabinet.

[0053] Based on the same inventive concept, the present application provides a data center, which comprises a load and an energy storage cabinet as described above, and the energy storage cabinet is used to supply power to the load.

[0054] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises a cover plate, a box body and a battery module accommodated in the box body, the cover plate covers the box body, the battery module comprises a plurality of battery cells, any two adjacent battery cells in the plurality of battery cells are connected by an aluminum bar, and two ends of the aluminum bar are connected to a positive pole of one of the two battery cells and a negative pole of the other battery cell. The cover plate is provided with a boss on an inner surface thereof facing the box body, and a heat-conducting pad is arranged between the boss and the aluminum bar.

2. The battery pack of claim 1, wherein, In the height direction of the battery pack, the thickness of the cover plate is less than the height of the battery module, and the height of the battery module is less than the height of the box body.

3. The battery pack of claim 1 or 2, wherein, The aluminum bar is provided with two grooves, the depth of the two grooves is less than or equal to 2 mm, and the projections of the two grooves in the height direction of the battery pack cover the projection of the positive pole of the one battery cell in the height direction of the battery pack and the projection of the negative pole of the other battery cell in the height direction of the battery pack respectively.

4. The battery pack of claim 3, wherein, The openings of the two grooves are respectively directed to the positive pole of the one battery cell and the negative pole of the other battery cell, one of the two grooves is used for accommodating the positive pole of the one battery cell, the other groove is used for accommodating the negative pole of the other battery cell, the gap between the inner wall of the one groove and the positive pole of the one battery cell is less than or equal to 0.5 mm, and the gap between the inner wall of the other groove and the negative pole of the other battery cell is less than or equal to 0.5 mm.

5. The battery pack of any one of claims 1-4, wherein, The battery pack comprises a partition plate, an end plate and a battery management unit, the partition plate is used for dividing the box body into two compartments, one of the two compartments is used for accommodating the battery module, and the other compartment is used for accommodating the battery management unit, one side wall of the box body is provided with an opening, the opening is perpendicular to the cover plate, the battery management unit is located between the partition plate and the opening, the end plate is buckled to the opening, the end plate is provided with a boss directed to the battery management unit, and a heat-conducting pad is arranged between the boss and the single plate of the battery management unit.

6. The battery pack of claim 5, wherein, The surface of the cover plate away from the box body is provided with heat dissipation teeth, and the heat dissipation teeth are arranged opposite to the boss of the cover plate.

7. The battery pack of claim 5 or 6, wherein, The surface of the end plate away from the battery management unit is provided with heat dissipation teeth, and the heat dissipation teeth on the end plate are arranged opposite to the boss of the end plate.

8. The battery pack of any one of claims 1-7, wherein, The bottom wall of the box body is provided with heat-conducting glue, and the heat-conducting glue is located between the bottom wall of the box body and the bottom surface of the battery module.

9. The battery pack of claim 8, wherein, The inner surface of the cover plate is sprayed with insulating paint.

10. The battery pack of claim 8, wherein, The inner surface of the cover plate is provided with a ceramic composite tape.

11. An energy storage cabinet characterized by, The energy storage cabinet comprises a cabinet body and a plurality of battery packs as claimed in any one of claims 1-10 located in the cabinet body, and the plurality of battery packs are stacked.

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