Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage, and discloses a battery pack and an energy storage system.The battery pack comprises a shell, a partition plate, a battery cell assembly, a battery management unit, a first connecting line, a first adapter and a second connecting line; the shell comprises a top cover and a base, the base is provided with a containing cavity with an opening in one end, and the top cover covers the base. The partition plate divides the containing cavity into a first cavity and a second cavity, and a preset gap is formed between the end, close to the top cover, of the partition plate and the top cover. The battery cell assembly is arranged in the first cavity. And the battery management unit is fixed on the base outside the accommodating cavity. One end of the first connecting wire is connected with the battery cell assembly, and the other end of the first connecting wire passes through the partition plate through the preset gap and then is connected with the first end of the first adapter in the second cavity. And the second connecting line connects the second end of the first adapter with the battery management unit outside the accommodating cavity. According to the battery pack provided by the embodiment of the invention, the workload and the time cost during maintenance are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0002] The oil-immersed liquid-cooled battery pack realizes efficient heat dissipation by completely immersing the battery cells in the cooling oil and utilizing the excellent thermal conductivity of the oil. The current oil-immersed liquid-cooled battery pack includes a shell, a battery cell assembly, a battery management unit and a connecting line. The shell includes a top cover and a base. The base is provided with an accommodating cavity with one end open. The battery cell assembly is soaked in the cooling oil stored in the accommodating cavity. The top cover is arranged on the opening of the base to close the opening. Since there is a certain gap between the liquid level of the cooling oil and the top cover, in order to prevent the cooling oil from leaking to the battery management unit connected by the connecting line, the battery management unit is arranged on the top cover. The connecting line is arranged through the top cover and connected to the battery management unit and the battery cell assembly at both ends.

[0003] However, when the top cover needs to be opened, the battery management unit needs to be disconnected from the connecting line, which increases the workload and time cost. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems in the background art, the purpose of the present application is to provide a battery pack and an energy storage system, which overcome the above problems or at least partially solve the above problems.

[0005] According to a first aspect of the present application, a battery pack is provided, which includes a shell, a partition plate, a battery cell assembly, a battery management unit, a first connecting line, a first adapter and a second connecting line. The shell includes a top cover and a base. The base is provided with an accommodating cavity with one end open. The top cover is arranged on the base to close the opening of the accommodating cavity. The partition plate is arranged in the accommodating cavity. The partition plate divides the accommodating cavity into a first cavity and a second cavity. There is a preset gap between the end of the partition plate close to the top cover and the top cover. The preset gap communicates the first cavity and the second cavity. The battery cell assembly is arranged in the first cavity. The battery management unit is fixed to the base outside the accommodating cavity. The first end of the first connecting line is connected to the battery cell assembly. The first adapter is arranged through the part of the base and the partition plate defining the second cavity. The second end of the first connecting line is connected to the first end of the first adapter in the second cavity after passing through the preset gap and the partition plate. The first end of the second connecting line is connected to the second end of the first adapter outside the accommodating cavity. The second end of the second connecting line is connected to the battery management unit.

[0006] In one or more optional embodiments above, a support beam is included and disposed on the partition near an end edge of the top cover, the support beam supporting the first connecting wire.

[0007] In one or more optional embodiments above, the support beam includes a first surface and a second surface disposed opposite to each other, and a planar portion connected between the first surface and the second surface, the first surface is disposed towards the first cavity, the second surface is disposed towards the second cavity, a connection between the first surface and the planar portion is arc-shaped, a connection between the second surface and the planar portion is arc-shaped, and the first connecting wire abuts against the planar portion in a direction from the top cover to the base.

[0008] In one or more optional embodiments above, a wire pressing clamp is included and disposed on the support beam, the wire pressing clamp and the support beam jointly clamp the first connecting wire.

[0009] In one or more optional embodiments above, a protective cover is included and fixed to the base, the protective cover covers the battery management unit, the protective cover is provided with a wire passing hole, and the wire passing hole is disposed in a direction from the top cover to the base.

[0010] In one or more optional embodiments above, a flexible busbar and a second adapter are included, the second adapter is disposed through a portion of the base and the partition defining the second cavity, a first end of the flexible busbar is connected with an electrode of the battery cell assembly, a second end of the flexible busbar is connected with a first end of the second adapter in the second cavity after passing through the partition through the pre-set gap, and a second end of the second adapter is used for electrical connection with other devices.

[0011] In one or more optional embodiments above, the flexible busbar includes a first vertical segment, a first horizontal segment, a second horizontal segment, a third horizontal segment and a second vertical segment connected in sequence, the first vertical segment is located in the first cavity, the first vertical segment is arranged to extend along a direction from the top cover to the base, one end of the first vertical segment is connected with an electrode of the battery cell assembly, the first vertical segment and the second vertical segment are arranged in parallel, have a preset interval between them along a first direction, and are arranged staggered along a second direction. The first horizontal segment is arranged to extend along the first direction, and is obtained by bending the other end of the first vertical segment away from the first vertical segment and then extending along the first direction. The second horizontal segment is arranged to extend along the second direction, and is obtained by bending the end of the first horizontal segment away from the first vertical segment and then extending along a direction parallel to the second direction. The third horizontal segment is arranged to extend along the first direction, and is obtained by bending the end of the second horizontal segment away from the first horizontal segment and then extending along the first direction. The second vertical segment is located in the second cavity, is arranged to extend along a direction from the top cover to the base, and is obtained by bending the end of the third horizontal segment away from the second horizontal segment and then extending along the direction from the top cover to the base. The first direction is perpendicular to the direction from the top cover to the base, and the second direction is perpendicular to the first direction.

[0012] In one or more optional embodiments above, the flexible busbar includes an extension segment, the extension segment is located in the second cavity, is arranged to extend along the second direction, and is obtained by bending the end of the second vertical segment away from the third horizontal segment and then extending along a direction parallel to the second direction.

[0013] In one or more optional embodiments above, the flexible busbar includes a support protrusion and a strap, the support protrusion is located in the second cavity, is fixed to the partition plate, is provided with a through hole and a support plane perpendicular to the first direction, and is arranged to extend along the second direction, along the first direction, the extension segment is attached to the support plane, and the strap is used to bundle and fix the extension segment to the support protrusion after passing through the through hole.

[0014] According to a second aspect of the present application, a battery pack is provided, which includes the battery pack as described above.

[0015] The beneficial effects of the embodiments of the present application are that the battery pack provided by the embodiments of the present application fixes the battery management unit to the base, and separates the accommodating cavity into a first cavity and a second cavity through the partition plate. The first adapter is arranged in the base and the part of the partition plate defining the second cavity, and the first connecting line connected with the battery cell assembly is connected with the first end of the first adapter in the second cavity. The second end of the first adapter and the battery management unit are respectively connected by the second connecting line outside the accommodating cavity. Compared with the conventional way of arranging the battery management unit on the top cover of the battery pack, the battery management unit of the present application is arranged separately from the top cover, and the second connecting line does not need to be disassembled from the battery management unit when the top cover is opened, which is beneficial to reduce the workload and time cost during maintenance, and the second cavity is beneficial to reduce the problem of the leakage of the insulating coolant through the gap between the first adapter and the base. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Figure 1 A perspective view of a battery pack provided by an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of a battery pack provided by an embodiment of the present application;

[0019] Figure 3 A partial enlarged view of Figure 2

[0020] Figure 4 A partial view of a battery pack hidden top cover provided by an embodiment of the present application;

[0021] Figure 5 A schematic view of a flexible busbar and a partition plate of a battery pack provided by an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present application, the present application will be described in more detail below in combination with the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intervening elements can be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in the present specification are only for the purpose of illustration. ​

[0023] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned in this specification are herein incorporated by reference in their entirety for the purpose of describing and disclosing, for example, the methodologies described in such publications that might be used in connection with the application.

[0024] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0026] Please refer to Figures 1-4 , the battery pack 1000 includes a shell 1, a partition plate 2, a battery cell assembly 3, a battery management unit 4, a first connecting line (not shown), a first adapter 5 and a second connecting line (not shown). The shell 1 includes a top cover 11 and a base 12, the base 12 is provided with an accommodating cavity A with one end opening, and the top cover 11 is arranged on the base 12 to close the opening a of the accommodating cavity A. The partition plate 2 is arranged in the accommodating cavity A, and the partition plate 2 divides the accommodating cavity A into a first cavity A1 and a second cavity A2. The partition plate 2 has a predetermined gap A3 between one end close to the top cover 11 and the top cover 11, and the predetermined gap A3 communicates the first cavity A1 and the second cavity A2. The battery cell assembly 3 is arranged in the first cavity A1. The battery management unit 4 is fixed to the base 12 outside the accommodating cavity A. The first end of the first connecting line is connected with the battery cell assembly 3. The first connecting line is connected with the first end of the first adapter 5 in the second cavity A2 through the predetermined gap A3 after passing through the part of the base 12 and the partition plate 2 defining the second cavity A2. The first end of the second connecting line is connected with the second end of the first adapter 5 outside the accommodating cavity A, and the second end of the second connecting line is connected with the battery management unit 4.

[0027] In use, the first cavity A1 stores insulating coolant, which includes but is not limited to insulating oil. The battery cell assembly 3 is immersed in the insulating coolant. The partition plate 2 prevents the insulating coolant from entering the second cavity A2.

[0028] The battery pack 1000 provided by the embodiments of the present application fixes the battery management unit 4 to the base 12, and separates the accommodating cavity A into a first cavity A1 and a second cavity A2 by the partition plate 2. The first adapter 5 is arranged in the base 12 and the part of the partition plate 2 defining the second cavity A2, and the first connecting line connected with the battery cell assembly 3 is connected with the first end of the first adapter 5 in the second cavity A2. The second end of the first adapter 5 and the battery management unit 4 are respectively connected by the second connecting line outside the accommodating cavity A. Compared with the conventional way of arranging the battery management unit 4 on the top cover 11 of the battery pack 1000, the battery management unit 4 of the present application is arranged separately from the top cover 11, and the second connecting line does not need to be detached from the battery management unit 4 when the top cover 11 is opened, which is beneficial to reduce the workload and time cost during maintenance, and the second cavity A2 is beneficial to reduce the problem of the insulation cooling liquid directly leaking out of the base 12 through the gap between the first adapter 5 and the base 12.

[0029] Please refer to Figure 1 、 Figure 3 、 Figure 4 and Figure 5 In some embodiments, the base 12 includes a bottom wall 121 and a side wall 122, the side wall 122 is arranged around the edge of the bottom wall 121, and the end of the side wall 122 away from the bottom wall 121 forms the opening a of the accommodating cavity A. The side wall 122 includes a front wall 1221, the partition plate 2 includes a vertical plate 21, a first side plate 22, a second side plate 23 and a bottom plate 24, and the vertical plate 21 is arranged opposite to the front wall 1221 along a first direction Y. The first side plate 22 and the second side plate 23 are arranged on the two sides of the vertical plate 21 along a second direction Z, respectively. One end of the vertical plate 21 is connected with the first end of the first side plate 22, the second end of the first side plate 22 is connected with the front wall 1221, the other end of the vertical plate 21 is connected with the first end of the second side plate 23, and the second end of the second side plate 23 is connected with the front wall 1221. The bottom plate 24 is connected with the front wall 1221, and the bottom end of the vertical plate 21 away from the top cover 11, the bottom end of the first side plate 22 away from the top cover 11 and the bottom end of the second side plate 23 away from the top cover 11 are all connected with the bottom plate 24. The vertical plate 21, the first side plate 22, the second side plate 23, the bottom plate 24 and the front wall 1221 jointly enclose the second cavity A2. The first direction Y is perpendicular to the direction X of the top cover 11 to the base 12, and the second direction Z is perpendicular to the first direction Y.

[0030] In some embodiments, the partition plate 2 is formed by bending and welding a metal plate, the bottom plate 24 is welded to the front wall 1221, the second end of the first side plate 22 is welded to the front wall 1221, and the second end of the second side plate 23 is welded to the front wall 1221.

[0031] It can be understood that the partition plate 2 is not limited to being formed only with the front wall 1221 to form the second cavity A2. In other embodiments, the base 12 comprises a first side wall and a second side wall arranged opposite to each other on both sides of the front wall 1221 along the second direction Z, and the partition plate 2 is connected with the first side wall, the second side wall and the bottom wall 121, and the partition plate 2, the first side wall 122, the second side wall 122, the bottom wall 121 and the front wall 1221 jointly form the second cavity A2.

[0032] In some embodiments, the part of the front wall 1221 that forms the second cavity A2 together with the partition plate 2 is provided with a first mounting hole (not shown in the figure), and the first adapter 5 is mounted in the first mounting hole. A sealing ring (not shown in the figure) is arranged between the first mounting hole and the first adapter 5, and / or a sealant (not shown in the figure) is arranged between the first mounting hole and the first adapter 5.

[0033] Please refer to Figures 3-5 In some embodiments, the battery pack 1000 comprises a support beam 25 arranged at one end edge of the partition plate 2 close to the top cover 11, and the support beam 25 supports the first connecting line.

[0034] In some embodiments, the support beam 25 is arranged at one end edge of the vertical plate 21 close to the top cover 11, and the support beam 25 extends along the second direction Z.

[0035] In some embodiments, the support beam 25 comprises a first surface 251 and a second surface 252 arranged opposite to each other, and a planar part 253 connected between the first surface 251 and the second surface 252, the first surface 251 is arranged towards the first cavity A1, the second surface 252 is arranged towards the second cavity A2, the connection between the first surface 251 and the planar part 253 is arranged in an arc surface, the connection between the second surface 252 and the planar part 253 is arranged in an arc surface, and the first connecting line abuts against the planar part 253 in the direction from the top cover 11 to the base 12. The planar part 253 is used to support the first connecting line, and the connections between the first surface 251 and the planar part 253 and between the second surface 252 and the planar part 253 are arranged in arc surfaces, which is beneficial to reduce the friction at the connections and reduce the wear when the first connecting line moves or is subjected to external force, thereby prolonging the service life of the first connecting line.

[0036] In some embodiments, the battery pack 1000 comprises a wire pressing clamp 6 arranged on the support beam 25, and the wire pressing clamp 6 and the support beam 25 jointly clamp the first connecting line.

[0037] In some embodiments, the wire pressing clamp 6 comprises a pressing piece 61, a first bolt 62 and a second bolt 63, and the two ends of the pressing piece 61 are fixed to the support beam 25 by the first bolt 62 and the second bolt 63 in the direction X from the top cover 11 to the base 12, and the pressing piece 61 and the planar part 253 jointly clamp the second end of the first connecting line.

[0038] Referring to Figure 1 and Figure 3 In some embodiments, the battery pack 1000 comprises a protective cover 7 fixed to the base 12, the protective cover 7 covering the battery management unit 4, the protective cover 7 being provided with a wire passing hole 71, the second end of the second connecting wire passing through the wire passing hole 71 and being connected with the battery management unit 4.

[0039] In some embodiments, the battery management unit 4 and the protective cover 7 are both fixed to the front wall 1221.

[0040] In some embodiments, the wire passing hole 71 is arranged towards the direction X from the top cover 11 to the base 12. In use, the direction X from the top cover 11 to the base 12 is the same as the direction of gravity, and when the insulating coolant seeps out of the shell 1 along the second connecting wire through the gap between the first adapter 5 and the shell 1, the liquid tends to flow along the direction of gravity. The wire passing hole 71 arranged towards the direction X from the top cover 11 to the base 12 is conducive to reducing the problem of insulating coolant spreading along the second connecting wire to the interface of the battery management unit 4, causing damage to the battery management unit 4.

[0041] Referring to Figures 3-5 In some embodiments, the battery pack 1000 comprises a flexible busbar 8 and a second adapter 9, the second adapter 9 being arranged through the part of the base 12 and the partition plate 2 defining the second cavity A2, the first end of the flexible busbar 8 being connected with the electrode of the battery cell assembly 3, the second end of the flexible busbar 8 being connected with the first end of the second adapter 9 in the second cavity A2 after passing over the partition plate 2 through the pre-set gap A3, and the second end of the second adapter 9 being used for electrical connection with other devices.

[0042] In some embodiments, the part of the front wall 1221 and the partition plate 2 defining the second cavity A2 is provided with a second mounting hole (not shown in the figure), and the second adapter 9 is mounted in the second mounting hole. A sealing ring is arranged between the second mounting hole and the second adapter 9, and / or a sealing glue is arranged between the second mounting hole and the second adapter 9.

[0043] In some embodiments, the flexible busbar 8 comprises a first vertical segment 81, a first horizontal segment 82, a second horizontal segment 83, a third horizontal segment 84 and a second vertical segment 85 connected in sequence, the first vertical segment 81 is located in the first cavity A1, the first vertical segment 81 extends in the direction X from the top cover 11 to the base 12, and one end of the first vertical segment 81 is connected with the electrode of the battery cell assembly 3. The first vertical segment 81 and the second vertical segment 85 are arranged in parallel along the first direction Y, and have a preset distance between them along the first direction Y, and are staggered along the second direction Z. The first horizontal segment 82 extends along the first direction Y, and is obtained by bending the other end of the first vertical segment 81 away from the first vertical segment 81 along the first direction Y. The second horizontal segment 83 extends along the second direction Z, and is obtained by bending the end of the first horizontal segment 82 away from the first vertical segment 81 along a direction parallel to the second direction Z. The third horizontal segment 84 extends along the first direction Y, and is obtained by bending the end of the second horizontal segment 83 away from the first horizontal segment 82 along the first direction Y. The second vertical segment 85 is located in the second cavity A2, and extends in the direction X from the top cover 11 to the base 12, and is obtained by bending the end of the third horizontal segment 84 away from the second horizontal segment 83 along the direction X from the top cover 11 to the base 12. The first direction Y is perpendicular to the direction X from the top cover 11 to the base 12, and the second direction Z is perpendicular to the first direction Y. By arranging the first horizontal segment 82, the second horizontal segment 83 and the third horizontal segment 84, the first vertical segment 81 and the second vertical segment 85 can be staggered by a preset distance along the second direction Z to meet the needs of electrical connection with parts located at different positions.

[0044] It can be understood that the direction in which the end of the first horizontal segment 82 away from the first vertical segment 81 is folded to obtain the second horizontal segment 83 can be selected as the second direction Z or a direction opposite to the second direction Z according to actual conditions.

[0045] In some embodiments, the battery pack 1000 comprises two flexible busbars 8, the electrodes of the battery cell assembly 3 comprise a first electrode and a second electrode, the number of the second adapter 9 is two, the first electrode is the total positive electrode of the battery cell assembly 3, and the second electrode is the total negative electrode of the battery cell assembly 3, the first vertical segment 81 of one flexible busbar 8 is connected with the first electrode and one second adapter 9, and the second vertical segment 85 of the other flexible busbar 8 is connected with the second electrode and the other second adapter 9.

[0046] In some embodiments, along the first direction Y, the cell assembly 3 is arranged in alignment with the vertical plate 21, along the second direction Z, the first electrode and the second electrode are arranged at two ends of the cell assembly 3 respectively, and the first electrode and the second electrode are located at two sides of the vertical plate 21 respectively. The first horizontal section 82 of the flexible busbar 8 connected with the second electrode is folded and extended from one end of the first vertical section 81 away from the first horizontal section 82 to obtain the second horizontal section 83, and the first horizontal section 82 of the flexible busbar 8 connected with the first electrode is folded and extended from one end of the first vertical section 81 away from the first horizontal section 82 to obtain the second horizontal section 83.

[0047] In some embodiments, the flexible busbar 8 connected with the second electrode comprises an extension section 86, the extension section 86 is located in the second cavity A2, the extension section 86 is arranged in extension along the second direction Z, and the extension section 86 is obtained by folding and extending from one end of the second vertical section 85 away from the third horizontal section 84 to the second direction Z.

[0048] It can be understood that the extension section 86 is selected to be arranged in the flexible busbar 8 connected with the first electrode and / or the flexible busbar 8 connected with the second electrode according to actual conditions. The direction in which one end of the second vertical section 85 away from the third horizontal section 84 is folded to obtain the extension section 86 can be selected to be the second direction Z or the direction opposite to the second direction Z according to actual conditions.

[0049] In some embodiments, the battery pack 1000 comprises a support protrusion 26 and a strap (not shown in the figure), the support protrusion 26 is located in the second cavity A2, the support protrusion 26 is fixed to the partition plate 2, the support protrusion 26 is provided with a through hole and a support plane perpendicular to the first direction Y, the support plane is arranged in extension along the second direction Z, along the first direction Y, the extension section 86 is attached to the support plane, and the strap is used to bundle and fix the extension section 86 to the support protrusion 26 after passing through the through hole.

[0050] Based on the same inventive concept, the application further provides an energy storage system comprising the battery pack 1000 in any of the above embodiments.

[0051] Based on the same inventive concept, the application further provides an energy storage device comprising the energy storage system in any of the above embodiments, and the energy storage device includes but is not limited to an energy storage container.

[0052] The above is only an embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a shell comprising a top cover and a base, the base being provided with an accommodating cavity with one end open, and the top cover being arranged on the base to close the opening of the accommodating cavity; a partition plate arranged in the accommodating cavity, the partition plate separating the accommodating cavity into a first cavity and a second cavity, and the partition plate having a preset gap between one end close to the top cover and the top cover, the preset gap communicating the first cavity with the second cavity; an electric core assembly arranged in the first cavity; a battery management unit fixed to the base outside the accommodating cavity; a first connecting line, a first end of the first connecting line being connected with the electric core assembly; a first adapter, the first adapter being arranged through the part of the base and the partition plate defining the second cavity, and a second end of the first connecting line being connected with a first end of the first adapter in the second cavity through the preset gap; a second connecting line, a first end of the second connecting line being connected with a second end of the first adapter outside the accommodating cavity, and a second end of the second connecting line being connected with the battery management unit.

2. The battery pack according to claim 1, further comprising: a support beam arranged at an edge of the partition plate close to the top cover, the support beam supporting the first connecting line.

3. The battery pack according to claim 2, wherein: the support beam comprises a first surface and a second surface arranged oppositely, and a flat part connected between the first surface and the second surface, the first surface is arranged towards the first cavity, the second surface is arranged towards the second cavity, the connection between the first surface and the flat part is arranged as an arc surface, the connection between the second surface and the flat part is arranged as an arc surface, and the first connecting line abuts against the flat part in the direction from the top cover to the base.

4. The battery pack according to claim 2, further comprising: a wire pressing clamp arranged on the support beam, the wire pressing clamp and the support beam jointly clamping the first connecting line.

5. The battery pack according to claim 1, further comprising: a protective cover fixed to the base, the protective cover covering the battery management unit, the protective cover being provided with a wire passing port arranged in the direction from the top cover to the base.

6. The battery pack according to claim 1, further comprising: a flexible busbar and a second adapter, the second adapter being arranged through the part of the base and the partition plate defining the second cavity, a first end of the flexible busbar being connected with an electrode of the electric core assembly, a second end of the flexible busbar being connected with a first end of the second adapter in the second cavity through the preset gap, and a second end of the second adapter being used for electrical connection with other devices.

7. The battery pack according to claim 6, wherein: The flexible busbar comprises a first vertical segment, a first horizontal segment, a second horizontal segment, a third horizontal segment and a second vertical segment connected in sequence, the first vertical segment is located in the first cavity, the first vertical segment is arranged to extend along the direction from the top cover to the base, one end of the first vertical segment is connected with the electrode of the battery cell assembly, the first vertical segment and the second vertical segment are arranged in parallel, there is a preset interval between the first vertical segment and the second vertical segment along the first direction, the first vertical segment and the second vertical segment are arranged staggered along the second direction; The first horizontal segment is arranged to extend along the first direction, the first horizontal segment is obtained by bending the other end of the first vertical segment away from the first vertical segment along the direction of the first direction and then extending; The second horizontal segment is arranged to extend along the second direction, the second horizontal segment is obtained by bending the end of the first horizontal segment away from the first vertical segment along the direction parallel to the second direction and then extending; The third horizontal segment is arranged to extend along the first direction, the third horizontal segment is obtained by bending the end of the second horizontal segment away from the first horizontal segment along the first direction and then extending; The second vertical segment is located in the second cavity, the second vertical segment is arranged to extend along the direction from the top cover to the base, the second vertical segment is obtained by bending the end of the third horizontal segment away from the second horizontal segment along the direction from the top cover to the base and then extending; The first direction is perpendicular to the direction from the top cover to the base, and the second direction is perpendicular to the first direction.

8. The battery pack of claim 7, wherein The flexible busbar comprises an extension segment, the extension segment is located in the second cavity, the extension segment is arranged to extend along the second direction, and the extension segment is obtained by bending the end of the second vertical segment away from the third horizontal segment along the direction parallel to the second direction and then extending.

9. The battery pack of claim 8, wherein The support protrusion is located in the second cavity, the support protrusion is fixed to the partition plate, the support protrusion is provided with a through hole and a support plane perpendicular to the first direction, the support plane is arranged to extend along the second direction, the extension segment is attached to the support plane along the first direction, and the tie is used to bundle and fix the extension segment to the support protrusion after passing through the through hole.

10. An energy storage system characterized by, The battery pack comprises the battery pack of any one of claims 1-9.

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