Battery pack, energy storage device and electrical equipment

Abstract

This application relates to a battery pack, an energy storage device, and an electrical equipment, and pertains to the technical field of energy storage. The battery pack includes a signal acquisition component, a separator, and at least two battery cells. The same battery cell includes a positive electrode terminal and a negative electrode terminal disposed back to back with respect to each other. At least two battery cells are electrically connected in series, wherein the positive electrode terminal of one battery cell and the negative electrode terminal of another battery cell face each other and are electrically connected. The casings of at least two battery cells are separated by the separator, and the separator is provided with a through hole. An electrical connection structure including a positively electrically connected positive electrode terminal and negative electrode terminal is inserted through the through hole. The acquisition portion of the signal acquisition component is connected to the electrical connection structure. In the battery pack, the space above the battery cells is saved, the size of the battery cells in the height direction can be designed to be relatively large, the overall volume of the battery cells can be designed to be relatively large, and the amount of electrical energy that the battery cells can store is relatively large. The battery pack of this application can have the advantage of relatively high energy density.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a battery pack, an energy storage device, and an electrical equipment. Background Art

[0002] In the related art, a battery pack includes battery modules, and each battery module includes an integrated busbar (CCS) and multiple battery cells (also known as battery monomers). The multiple battery cells are electrically connected through the integrated busbar. However, the integrated busbar has a relatively large volume, and the space occupied by the integrated busbar inside the battery pack is relatively large, resulting in a relatively small space for placing battery cells inside the battery pack. Correspondingly, the energy density of the battery pack is relatively small. Summary of the Invention

[0003] This application provides a battery pack, an energy storage device, and an electrical equipment, which can improve the problem of relatively small energy density of the battery pack.

[0004] In a first aspect, this application provides a battery pack, which includes a signal acquisition component, a separator, and at least two battery monomers. Inside the same battery monomer, the battery monomer includes a positive electrode column and a negative electrode column that are arranged back to back in a first direction. At least two battery monomers are distributed along the first direction and are connected in series. Among two battery monomers connected in series, the positive electrode column of one battery monomer and the negative electrode column of the other battery monomer face each other and are electrically connected. The casings of at least two battery monomers distributed along the first direction are separated by the separator. The separator is provided with a through hole, and an electrical connection structure including the electrically connected positive electrode column and negative electrode column penetrates through the through hole. The signal acquisition component includes an acquisition part, and the acquisition part is connected to the electrical connection structure.

[0005] According to the content of the battery pack of this application described above, inside the battery pack box body, the electrical connection structure including the positive electrode column and the negative electrode column does not occupy the space above the battery monomer, and the acquisition part of the signal acquisition component also does not occupy the space above the battery monomer. There is no need to set a wire harness isolation board above the battery monomer, and the space above the battery monomer can be not occupied or occupied less. Under the condition of using a battery pack box body with the same size specification, compared with the related art, in the battery pack of this application, the space above the battery monomer is saved, the size of the battery monomer in the height direction can be designed relatively large, the overall volume of the battery monomer can be designed relatively large, and the electric energy that the battery monomer can store is more. Therefore, the battery pack of this application can have the advantage of relatively large energy density.

[0006] Optionally, inside the electrical connection structure, the positive electrode column and the negative electrode column are directly electrically connected, at least part of the structure of the positive electrode column is located inside the through hole, and / or at least part of the structure of the negative electrode column is located inside the through hole.

[0007] Optionally, within the electrical connection structure, at least one of the positive electrode column and the negative electrode column is provided with a receiving notch, the collecting portion is located within the receiving notch, and the collecting portion is clamped by the positive electrode column and the negative electrode column.

[0008] Optionally, the negative electrode column is provided with a receiving notch, and the receiving notch is recessed in the end face of the negative electrode column and extends to the side surface of the negative electrode column.

[0009] Optionally, the positive electrode column is provided with a receiving notch, and the receiving notch is recessed in the end face of the positive electrode column and extends to the side surface of the positive electrode column.

[0010] Optionally, the electrical connection structure further includes a conductive intermediate member, at least a part of the structure of the conductive intermediate member is located within the through hole, within the electrical connection structure, the positive electrode column is indirectly electrically connected to the negative electrode column through the conductive intermediate member, the signal collecting member includes at least two collecting portions, and at least two collecting portions are connected to the conductive intermediate member.

[0011] Optionally, the conductive intermediate member is further connected to the separator.

[0012] Optionally, within the electrical connection structure, the conductive intermediate member is located within the through hole, at least a part of the structure of the positive electrode column is located within the through hole, the projection range of the positive electrode column in the plane of the separator along the first direction is range α, the projection range of the conductive intermediate member in the plane of the separator along the first direction is range γ, and range α and range γ at least partially overlap.

[0013] Optionally, within the electrical connection structure, the conductive intermediate member is located within the through hole, at least a part of the structure of the negative electrode column is located within the through hole, the projection range of the negative electrode column in the plane of the separator along the first direction is range β, the projection range of the conductive intermediate member in the plane of the separator along the first direction is range γ, and range β and range γ at least partially overlap.

[0014] Optionally, at least a part of the structure of the collecting portion extends into the through hole along a direction intersecting the first direction.

[0015] Optionally, the signal collecting member further includes a wire harness, the wire harness is connected to the collecting portion, the separator is provided with a penetrated notch, the penetrated notch is communicated with the through hole, and the wire harness extends from the through hole through the penetrated notch to the outside of the separator.

[0016] Optionally, the signal collecting member further includes a wire harness, the wire harness is connected to the collecting portion, a wire harness hole is buried in the separator, the wire harness hole is communicated with the through hole, and the wire harness extends from the through hole through the wire harness hole to the outside of the separator.

[0017] Optionally, the signal collecting member further includes a wire harness, the wire harness is connected to the collecting portion, the separator is recessed with a wire harness groove, the wire harness groove is communicated with the through hole, and the wire harness extends from the through hole through the wire harness groove to the outside of the separator.

[0018] Optionally, within the same battery cell, the battery cell includes two first side structural walls arranged back to back with each other in a first direction and two second side structural walls arranged back to back with each other in a second direction, the second direction intersects the first direction, the area of any one of the first side structural walls is greater than the area of any one of the second side structural walls, the positive electrode terminal is disposed on one of the first side structural walls, and the negative electrode terminal is disposed on the other first side structural wall.

[0019] Optionally, within the same battery cell, the projection range of the positive electrode terminal on the first side structural wall along the first direction is a first range, the projection range of the negative electrode terminal on the first side structural wall along the first direction is a second range, and the first range and the second range do not overlap.

[0020] Optionally, the battery cell further includes an explosion-proof valve. Within the same battery cell, the positive electrode terminal, the negative electrode terminal, and the explosion-proof valve are located on different structural walls of the battery cell.

[0021] Optionally, the material of the separator includes an insulating material and / or a heat-insulating material.

[0022] Optionally, the separator is provided with flow channels for the coolant to flow through.

[0023] In a second aspect, the present application provides an energy storage device. The energy storage device includes the battery pack described above. Since the energy density of the battery pack is relatively large, correspondingly, the energy density of the energy storage device is also relatively large.

[0024] In a third aspect, the present application provides an electrical device. The electrical device includes the energy storage device described above. The electrical device can be an electric vehicle, a power grid, a household appliance, etc.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic assembly structure diagram of a battery unit, a wiring harness isolation plate, a tab, and a signal acquisition line included in a battery pack in the related art;

[0028] Figure 2 It is a perspective view of a battery cell provided by the present application in a specific embodiment;

[0029] Figure 3 For Figure 2Stereogram of the middle battery cell from another three-dimensional perspective;

[0030] Figure 4 is Figure 2 Side view of the middle battery cell from a side view perspective;

[0031] Figure 5 Schematic diagram of the series electrical connection structure of four battery cells in a specific embodiment;

[0032] Figure 6 Schematic diagram of the alternating arrangement of four battery cells and three separators in a specific embodiment;

[0033] Figure 7 Cross-sectional structure schematic diagram of the first battery cell, the second battery cell and the separator;

[0034] Figure 8 is Figure 7 Partial enlarged schematic diagram of part A in

[0035] Figure 9 Assembly structure schematic diagram of the negative electrode post and the post mounting ring from a three-dimensional perspective;

[0036] Figure 10 Cross-sectional structure schematic diagram of the second battery cell, the third battery cell and the separator;

[0037] Figure 11 is Figure 10 Partial enlarged schematic diagram of part B in

[0038] Figure 12 Assembly structure schematic diagram of the positive electrode post and the post mounting ring from a three-dimensional perspective;

[0039] Figure 13 is Figure 11 Schematic diagram of the replacement structure of the structure in

[0040] Figure 14 Partial assembly structure schematic diagram of the separator, the signal acquisition component and the negative electrode post;

[0041] Figure 15 Partial assembly structure schematic diagram of the separator, the signal acquisition component and the negative electrode post from a cross-sectional perspective;

[0042] Figure 16 Cross-sectional structure schematic diagram of the first battery cell, the second battery cell and the separator in another embodiment;

[0043] Figure 17 is Figure 16 Partial enlarged schematic diagram of part C in

[0044] Figure 18Schematic diagram of the partial assembly structure of the separator, signal acquisition component, and conductive intermediate component;

[0045] Figure 19 Schematic diagram of the partial assembly structure of the separator and signal acquisition component from a sectional view perspective;

[0046] Figure 20 Schematic diagram of the distribution of the projection ranges of the positive electrode post and negative electrode post on the first side structural wall;

[0047] Figure 21 Schematic diagram of the position of the part of the wire harness located outside the separator relative to the separator;

[0048] Figure 22 Schematic diagram of the structure of two rows of battery cells from a three-dimensional perspective;

[0049] Figure 23 Schematic diagram of the separator in another embodiment;

[0050] Figure 24 Schematic diagram of the signal acquisition component in another specific embodiment;

[0051] Figure 25 Schematic diagram of the signal acquisition component in yet another specific embodiment;

[0052] Figure 26 Schematic diagram of multiple serially electrically connected battery cells arranged horizontally in the battery pack box;

[0053] Figure 27 Schematic diagram of multiple serially electrically connected battery cells arranged vertically in the battery pack box.

[0054] Explanation of reference numerals:

[0055] 10 - Battery cell, 10a - Terminal post, 20 - Bar piece, 30 - Wiring harness isolation board, 40 - Signal acquisition wire, 1 - Battery monomer, 101 - First column of battery monomers, 102 - Second column of battery monomers, 1a - First battery monomer, 1b - Second battery monomer, 1c - Third battery monomer, 1d - Fourth battery monomer, 11 - Positive terminal post, 111 - Positive terminal accommodating notch, 112 - Positive terminal face, 113 - Positive terminal side, TY1 - First range, 12 - Negative terminal post, 121 - Negative terminal accommodating notch, 122 - Negative terminal face, 123 - Negative terminal side, TY2 - Second range, 13 - Housing, 131 - Top structural wall, 132 - Bottom structural wall, 133 - Side structural wall, 1331 - First side structural wall, 1332 - Second side structural wall, 14 - Terminal post mounting ring, 2 - Separator, 2a - First separation part, 2b - Second separation part, 21 - Through hole, 22 - Pierced notch, 23 - Wiring harness hole, 3 - Signal acquisition component, 3a - First group of signal acquisition components, 3b - Second group of signal acquisition components, 31 - Acquisition part, 32 - Wiring harness, 321 - Main wiring harness, 322 - Branch wiring harness, 4 - Conductive intermediate component, DL - Electrical connection structure, 50 - Box body. Detailed implementation manners

[0056] For a better understanding of the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application. The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "this" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should be understood that the term " / " used herein generally represents an "or" relationship between the associated objects before and after.

[0057] In the accompanying drawings herein, direction X, direction Y and direction Z are perpendicular to each other pairwise. Among them, direction Z can represent the direction from the top structural wall of the battery monomer to the bottom structural wall of the battery monomer.

[0058] Please refer to Figure 1As shown, in the related art, multiple battery cells 10 are arranged along the direction X, and each battery cell 10 includes pole columns 10a (such as positive and negative pole columns) located above. An integrated busbar (CellsContact System, CCS) is also provided above each battery cell 10. The integrated busbar can also be called a wire harness board assembly or a busbar assembly. The integrated busbar includes busbar pieces 20, wire harness isolation boards 30, and signal acquisition lines 40. The battery cell 10 is located below the wire harness isolation board 30, and the busbar piece 20 is installed above the wire harness isolation board 30. The busbar piece 20 is welded and electrically connected to the pole column 10a. Specifically, the positive pole column of the first battery cell 10 can be electrically connected to the negative pole column of the second battery cell 10 through the first busbar piece 20, and the positive pole column of the second battery cell 10 can be electrically connected to the negative pole column of the third battery cell 10 through the second busbar piece 20, and so on. Multiple battery cells 10 can be connected in series electrically through the busbar pieces 20. The signal acquisition line 40 is also installed above the wire harness isolation board 30, and the acquisition part of the signal acquisition line 40 is arranged on the busbar piece 20. The signal acquisition line 40 can be used to acquire signals such as temperature signals, voltage signals, and current signals.

[0059] In the related art, in the battery pack, since the integrated busbar has a certain volume, the integrated busbar occupies more space above the battery cell, restricting the total volume of all battery cells that can be placed in the battery pack. Therefore, the energy density of the battery pack in the related art is relatively small.

[0060] To address the above technical problems, the present application provides some embodiments of a battery pack. The battery pack includes a signal acquisition component, a partition component, and at least two battery monomers.

[0061] Please refer to Figures 2 - 4 As shown, within the same battery monomer 1, the battery monomer 1 includes a positive pole column 11 and a negative pole column 12 arranged back to back with each other in the first direction. Among them, the first direction is parallel to the direction X, and the first direction described in the subsequent content of this article is also parallel to the direction X.

[0062] Please refer to Figure 5 As shown, at least two battery monomers 1 are distributed along the first direction and are connected in series electrically. Among two battery monomers 1 connected in series electrically, the positive pole column 11 of one battery monomer 1 and the negative pole column 12 of the other battery monomer 1 can face each other and be electrically connected.

[0063] Please refer to Figure 5As shown, the battery pack may include a first battery cell 1a, a second battery cell 1b, a third battery cell 1c, and a fourth battery cell 1d. The negative electrode terminal 12 of the first battery cell 1a and the positive electrode terminal 11 of the second battery cell 1b may face each other and be electrically connected. The negative electrode terminal 12 of the second battery cell 1b and the positive electrode terminal 11 of the third battery cell 1c may face each other and be electrically connected. The negative electrode terminal 12 of the third battery cell 1c and the positive electrode terminal 11 of the fourth battery cell 1d may face each other and be electrically connected.

[0064] In other embodiments, the battery pack may also include other numbers of battery cells connected in series.

[0065] Please refer to Figure 6 As shown, between the housings of at least two battery cells 1 distributed in the first direction, they are separated by a separator 2.

[0066] Please refer to Figure 6 As shown, the battery pack may include a first battery cell 1a, a second battery cell 1b, a third battery cell 1c, a fourth battery cell 1d, and three separators 2. The housing of the first battery cell 1a and the housing of the second battery cell 1b are separated by the separator 2. The housing of the second battery cell 1b and the housing of the third battery cell 1c are separated by the separator 2. The housing of the third battery cell 1c and the housing of the fourth battery cell 1d are separated by the separator 2.

[0067] In other embodiments, the battery pack may also include other numbers of battery cells and other numbers of separators.

[0068] In some embodiments, the separator may be provided with a through hole. The through hole may penetrate the separator in the first direction, and an electrical connection structure including a positively connected positive electrode terminal and negative electrode terminal may be inserted into the through hole. Please refer to Figure 7 As shown, taking the adjacent first battery cell 1a and second battery cell 1b as an example, a separator 2 is provided between the first battery cell 1a and the second battery cell 1b. Please refer to Figure 8 As shown, the separator 2 is provided with a through hole 21, and an electrical connection structure DL including a positively connected positive electrode terminal 11 and negative electrode terminal 12 is inserted into the through hole 21.

[0069] In some embodiments, the signal acquisition component includes an acquisition part. The acquisition part is connected to the electrical connection structure DL, and the acquisition part may be used to acquire the temperature signal, current signal, and voltage signal of the electrical connection structure DL.

[0070] According to the content of the embodiments of the battery pack provided in the present application described above, in the battery pack box body, the electrical connection structure including the positive electrode post and the negative electrode post does not occupy the space above the battery cell, and the collection part of the signal collection component also does not occupy the space above the battery cell, nor is it necessary to set a wire harness isolation board above the battery cell. The space above the battery cell can be not occupied or occupied less. Under the condition of using a battery pack box body with the same size specification, in the related art, the space above the battery cell is occupied by non-battery structural components, which limits the total volume of the battery cell. Compared with the related art, in some embodiments of the present application, the space above the battery cell is saved, the size of the battery cell in the height direction can be designed to be relatively large, the total volume of the battery cell can be designed to be relatively large, and the electric energy that the battery cell can store is more. Therefore, some embodiments of the battery pack provided in the present application can have the advantage of relatively large energy density.

[0071] Generally, an interval space needs to be provided between two adjacent battery cells. The interval space can have the following functions: The interval space can play an insulating role to reduce the possibility of electric breakdown between the shells of two adjacent battery cells. The interval space can also play a heat insulation role to reduce the possibility of direct heat conduction between the shells of two adjacent battery cells. Since the battery cell may expand after being charged, this interval space can provide deformation space for the battery cell.

[0072] In some embodiments of the present application, the interval space between two adjacent battery cells is also used to place the electrical connection structure including the positive electrode post and the negative electrode post. The electrical connection structure located in the interval space may not increase the occupied size along the first direction, thereby saving the space above the battery cell. Or, even if the electrical connection structure located in the interval space may increase the occupied size along the first direction, the increased occupied space volume in the first direction is less than the saved space volume above the battery cell. Therefore, some embodiments of the battery pack provided in the present application can still have the advantage of relatively large energy density.

[0073] In some embodiments of the present application, the interval space between two adjacent battery cells can also be used to place a separator. However, since the separator is provided with through holes, the through holes are penetrated by the electrical connection structure including the positive electrode post and the negative electrode post. Therefore, this setting has the advantage of relatively high structural compactness, enabling the volume of the battery cell to be designed to be relatively large, and thus enabling the battery pack to have a relatively large energy density.

[0074] In some embodiments of the present application, the separator 2 can include an insulating material. The separator 2 can play an insulating role between the shells of two adjacent battery cells to reduce the possibility of electric breakdown problems between the shells of two adjacent battery cells.

[0075] In some embodiments of the present application, the separator 2 may include a heat-insulating material to reduce the degree of possibility of direct heat conduction between the housings of two adjacent battery cells, thereby reducing the degree of possibility of explosion of the battery cells.

[0076] In some embodiments of the present application, the separator 2 may be provided with a flow channel (not shown in the figure) for the coolant to flow. The coolant may flow along the flow channel and absorb the heat of the parts of the housings of two adjacent battery cells facing each other, so as to improve the heat dissipation efficiency of the parts of the housings of two adjacent battery cells facing each other.

[0077] Wherein, the flow channel may be recessed in the separator 2, or the flow channel may be buried in the separator 2.

[0078] In some embodiments, please refer to Figure 8 As shown, in the electrical connection structure DL, the positive electrode post 11 and the negative electrode post 12 may be directly electrically connected. Both the positive electrode post 11 and the negative electrode post 12 are located in the through hole 21. This setting can make the structural compactness degree between the electrical connection structure DL and the separator 2 relatively high, and occupy relatively less space in the battery pack box body.

[0079] Wherein, the setting of directly electrically connecting the positive electrode post 11 and the negative electrode post 12 also makes the resistance between the positive electrode post 11 and the negative electrode post 12 relatively small, and the heat generation amount between the positive electrode post 11 and the negative electrode post 12 during conduction is relatively small, that is, it has the advantages of high current transmission efficiency and low energy loss.

[0080] In other embodiments (not shown in the figure), a part of the structure of the positive electrode post may be located in the through hole, and another part of the structure of the positive electrode post may be located outside the through hole.

[0081] In other embodiments (not shown in the figure), a part of the structure of the negative electrode post may be located in the through hole, and another part of the structure of the negative electrode post may be located outside the through hole.

[0082] In some embodiments, in the same electrical connection structure, please refer to Figure 9 As shown, the negative electrode post 12 may be provided with a negative electrode accommodation notch 121. At least part of the structure of the collection part (not shown in the figure) may be located in the negative electrode accommodation notch 121, and the collection part may be clamped by the positive electrode post (not shown in the figure) and the negative electrode post 12 in the same electrical connection structure. It can be seen that this setting has the advantage of relatively high structural compactness and occupies relatively less space in the battery pack box body. Please refer to Figure 10 As shown, taking the adjacent second battery cell 1b and the third battery cell 1c as an example, please refer to Figure 11As shown, a collection part 31 is held between the negative electrode post 12 of the second battery cell 1b and the positive electrode post 11 of the third battery cell 1c, and at least part of the structure of the collection part 31 can be located in the negative electrode accommodation notch of the negative electrode post 12.

[0083] Please refer to Figure 9 As shown, when a negative electrode accommodation notch 121 is provided on the negative electrode post 12, the negative electrode accommodation notch 121 is recessed in the negative electrode end face 122 of the negative electrode post 12 and extends to the negative electrode side face 123 of the negative electrode post 12. This setting facilitates the insertion or detachment of the collection part 31 into or from the negative electrode accommodation notch 121 in a direction perpendicular to the first direction, and there is no need to disassemble two electrically connected battery cells during maintenance, so the maintenance workload is relatively small.

[0084] Among them, the negative electrode end face 122 can be parallel to the direction Y and the direction Z, the negative electrode end face 122 can be perpendicular to the direction X, the negative electrode side face 123 can intersect the direction Y and the direction Z, and the negative electrode side face 123 can be parallel to the direction X.

[0085] In addition, the negative electrode end face 122 is used to abut against and be electrically connected to the positive electrode end face of the positive electrode post.

[0086] In other embodiments (not shown in the figure), the negative electrode accommodation notch can be recessed only in the negative electrode side face of the negative electrode post.

[0087] In other embodiments, in the same electrical connection structure, please refer to Figure 12 As shown, the positive electrode post 11 can be provided with a positive electrode accommodation notch 111, and at least part of the structure of the collection part (not shown in the figure) can be located in the positive electrode accommodation notch 111. Please refer to Figure 13 As shown, the collection part 31 located in the positive electrode accommodation notch (not shown in the figure) can be held by the positive electrode post 11 and the negative electrode post 12 on both sides.

[0088] Please refer to Figure 12 As shown, when a positive electrode accommodation notch 111 is provided on the positive electrode post 11, the positive electrode accommodation notch 111 is recessed in the positive electrode end face 112 of the positive electrode post 11 and extends to the positive electrode side face 113 of the positive electrode post 11. This setting facilitates the insertion or detachment of the collection part 31 into or from the positive electrode accommodation notch 111 in a direction perpendicular to the first direction, and there is no need to disassemble two electrically connected battery cells during maintenance, so the maintenance workload is relatively small.

[0089] Among them, the positive electrode end face 112 can be parallel to the direction Y and the direction Z, the positive electrode end face 112 can be perpendicular to the direction X, the positive electrode side face 113 can intersect the direction Y and the direction Z, and the positive electrode side face 113 can be parallel to the direction X.

[0090] In addition, the positive electrode end face 112 is used to abut against and be electrically connected to the negative electrode end face of the negative electrode post.

[0091] In other embodiments (not shown in the figures), the positive electrode receiving notch may be recessed only on the positive electrode side of the positive electrode post.

[0092] In other embodiments (not shown in the figures), within the same electrical connection structure, the negative electrode post is provided with a negative electrode receiving notch, and the positive electrode post is also provided with a positive electrode receiving notch. A part of the structure of the collecting portion may be located in the negative electrode receiving notch, and another part of the structure of the collecting portion may be located in the positive electrode receiving notch. The collecting portion is clamped by the positive electrode post and the negative electrode post on both sides.

[0093] In some embodiments, since the collecting portion is clamped by the positive electrode post and the negative electrode post on both sides, and the positive electrode post and the negative electrode post apply clamping forces on both sides of the collecting portion, even if the collecting portion has a tendency to move relative to the positive electrode post and the negative electrode post, the static friction force between the collecting portion and the positive electrode post and the static friction force between the collecting portion and the negative electrode post will limit the collecting portion from detaching from the positive electrode post and the negative electrode post. Therefore, welding may not be used for the connection between the collecting portion and the positive electrode post and the connection between the collecting portion and the negative electrode post. Since welding is not required, it is convenient to quickly disassemble and assemble during maintenance.

[0094] In some embodiments, the surface of the collecting portion may include a matte surface to enhance the static friction force between the collecting portion and the positive electrode post and the static friction force between the collecting portion and the negative electrode post.

[0095] In some embodiments, the connection between the collecting portion and the positive electrode post, the connection between the collecting portion and the negative electrode post, and the connection between the positive electrode post and the negative electrode post may also be bonded with a conductive adhesive to further improve the connection reliability and further improve the electrical conductivity between the positive electrode post and the negative electrode post.

[0096] In other embodiments, welding may also be used for the connection between the collecting portion and the positive electrode post and the connection between the collecting portion and the negative electrode post.

[0097] In other embodiments (not shown in the figures), the collecting portion may not be clamped by the positive electrode post and the negative electrode post. For example, the structure of the collecting portion includes an annular structure provided with a through hole, and the through hole may be penetrated by the positive electrode post or the negative electrode post. The collecting portion may be connected to the positive electrode side of the positive electrode post or the negative electrode side of the negative electrode post. Further, the collecting portion may be bonded to the positive electrode side or the negative electrode side with a conductive adhesive.

[0098] In other embodiments (not shown in the figures), the collecting portion may not be clamped by the positive electrode post and the negative electrode post. For example, the structure of the collecting portion includes a sheet structure, and the sheet structure may be adhesively connected to the positive electrode side of the positive electrode post or the negative electrode side of the negative electrode post. Further, the collecting portion may be bonded to the positive electrode side or the negative electrode side with a conductive adhesive.

[0099] In some embodiments, please refer to Figure 9As shown, the battery cell may include a pole mounting ring 14. The housing of the battery cell is provided with a mounting hole (not shown in the figure). The pole mounting ring 14 is installed in the mounting hole. The pole mounting ring 14 is provided with a through hole (not shown in the figure). The negative pole 12 passes through the through hole of the pole mounting ring 14. The pole mounting ring 14 surrounds the negative pole 12. The negative pole 12 is fixed to the housing of the battery cell through the pole mounting ring 14. The pole mounting ring 14 also has insulation so that there is no electrical conduction between the housing of the battery cell and the negative pole 12. Similarly, please refer to Figure 12 As shown, the positive pole 11 can also be fixed to the housing of the battery cell through the corresponding pole mounting ring 14.

[0100] According to the above content, at least part of the structure of the acquisition part can extend in a direction intersecting the first direction into the through hole. In this setting, it can have the advantage of a relatively high degree of structural compactness. In the subsequent content of this article, mainly taking "the overall structure of the acquisition part can be located in the through hole" as an example for description.

[0101] In some embodiments, please refer to Figure 14 As shown, the signal acquisition member 3 further includes a wire harness 32. The wire harness 32 is connected to the acquisition part 31. The signal acquired by the acquisition part 31 can be transmitted to the Battery Management Unit (BMU) through the wire harness 32.

[0102] Please refer to Figure 14 As shown, the separator 2 can be provided with a penetrated notch 22. The penetrated notch 22 is connected to the through hole 21. The wire harness 32 can extend from the through hole 21 through the penetrated notch 22 to outside the separator 2, so that the wire harness 32 is connected to the battery management unit. In this setting, the structural compactness degree between the signal acquisition member 3 and the separator 2 is relatively high.

[0103] Among them, the extending direction of the penetrated notch 22 can be perpendicular to the first direction. For example, the extending direction of the penetrated notch 22 can be direction Z or direction Y.

[0104] In addition, the width of the penetrated notch 22 can be equal to the outer diameter size of the wire harness 32, so that the side wall of the penetrated notch 22 can play a limiting role on the wire harness 32. Or, the width of the penetrated notch 22 can be 0.1 mm to 1 mm smaller than the outer diameter size of the wire harness 32, so that the side wall of the penetrated notch 22 can play a clamping role on the wire harness 32, thereby achieving a better limiting effect. Or, the width of the penetrated notch 22 can be 0.1 mm to 1 mm larger than the outer diameter size of the wire harness 32, and it can also make the side wall of the penetrated notch 22 play a limiting role on the wire harness 32. Of course, the wire harness 32 will also be limited by the housings of the two battery cells on both sides.

[0105] Furthermore, the side wall of the through notch 22 can be adhered to the wire harness 32, so that the wire harness 32 is reliably limited in the through notch 22, reducing the possibility of external vibration being transmitted to the acquisition part 31 through the wire harness 32, thereby enabling the acquisition part 31 to be reliably connected to the electrical connection structure including the positive electrode post and the negative electrode post.

[0106] In addition, the side wall of the through notch 22 can be provided with a buckle (not shown in the figure). The buckle includes an L-shaped structure, a C-shaped structure or a U-shaped structure. The wire harness 32 can be snapped into the buckle, reducing the possibility of external vibration being transmitted to the acquisition part 31 through the wire harness 32, thereby enabling the acquisition part 31 to be reliably connected to the electrical connection structure including the positive electrode post and the negative electrode post.

[0107] In some embodiments, please refer to Figure 15 As shown, a wire harness hole 23 can be buried in the separator 2. The wire harness hole 23 is connected to the through hole 21, and the wire harness �2 can extend from the through hole 21 through the wire harness hole 23 to the outside of the separator 2. Thus, the wire harness 32 is connected to the battery management unit. In this setting, the structural compactness between the signal acquisition part 3 and the separator 2 is relatively high.

[0108] Among them, the extending direction of the wire harness hole 23 can be perpendicular to the first direction. For example, the extending direction of the wire harness hole 23 can be the direction Z or the direction Y.

[0109] In addition, the wire harness hole 23 can play a good limiting role on the wire harness 32, reducing the possibility of external vibration being transmitted to the acquisition part 31 through the wire harness 32, thereby enabling the acquisition part 31 to be reliably connected to the electrical connection structure including the positive electrode post and the negative electrode post.

[0110] In some embodiments (not shown in the figure), the separator can be recessed with a wire harness groove. The wire harness groove is connected to the through hole, and the wire harness can extend from the through hole through the wire harness groove to the outside of the separator.

[0111] In some embodiments, within the same electrical connection structure, the positive electrode post and the negative electrode post may not be directly electrically connected. Taking the adjacent first battery cell 1a and second battery cell 1b as shown in Figure 16 For example, please refer to Figure 17 As shown, the electrical connection structure DL may further include a conductive intermediate member 4. At least part of the structure of the conductive intermediate member 4 is located in the through hole 21, and the positive electrode post 11 is indirectly electrically connected to the negative electrode post 12 through the conductive intermediate member 4. Please refer to Figure 18 As shown, the same signal acquisition part 3 may include at least two acquisition parts 31, and the at least two acquisition parts 31 are connected to the conductive intermediate member 4. In this setting, the conductive intermediate member 4 can provide a relatively large installation site, so that the at least two acquisition parts 31 can simultaneously acquire the signals of the electrical connection structure DL.

[0112] Please refer to Figure 18 As shown, the signal acquisition component 3 may include three acquisition parts 31. One acquisition part 31 may acquire temperature signals, another acquisition part 31 may acquire current signals, and yet another acquisition part 31 may acquire voltage signals.

[0113] Among them, the acquisition part 31 and the conductive intermediate part 4 may be welded or bonded with conductive glue.

[0114] Please refer to Figure 18 As shown, the projection range of the positive electrode column (not shown in the figure) on one side of the conductive intermediate part 4 in the plane of the separator 2 along the first direction may be range α, the projection range of the conductive intermediate part 4 in the plane of the separator 2 along the first direction may be range γ, and range α and range γ may at least partially overlap. Please refer to Figure 18 As shown, the projection range of the negative electrode column (not shown in the figure) on the other side of the conductive intermediate part 4 in the plane of the separator 2 along the first direction may be range β, the projection range of the conductive intermediate part 4 in the plane of the separator 2 along the first direction may be range γ, and range β and range γ may at least partially overlap. It should be noted that the plane of the separator 2 refers to an infinitely extendable plane on the separator 2 that is parallel to direction Y and direction Z.

[0115] The positive electrode column and the conductive intermediate part may be in abutment, welded, or bonded with conductive glue. Similarly, the negative electrode column and the conductive intermediate part may be in abutment, welded, or bonded with conductive glue.

[0116] In some embodiments, please refer to Figures 17 - 18 As shown, the four peripheral edges of the conductive intermediate part 4 may be fixedly connected to the hole wall of the through hole 21 (such as interference fit or bonding) so that the conductive intermediate part 4 is fixed relative to the separator 2.

[0117] In other embodiments (not shown in the figure), the four peripheral edges of the conductive intermediate part may be embedded in the separator.

[0118] In other embodiments, the conductive intermediate part and the separator may not be connected, and the conductive intermediate part may be clamped and fixed by the positive electrode column and the negative electrode column on both sides.

[0119] In some embodiments, please refer to Figure 17 As shown, the conductive intermediate part 4 may not completely occupy all the space of the through hole 21. In addition to the conductive intermediate part 4 being located in the through hole 21, at least part of the structure of the positive electrode column may be located in the through hole 21, and at least part of the structure of the negative electrode column may also be located in the through hole 21.

[0120] In other embodiments (not shown in the figure), the conductive intermediate part may be located in the through hole, while at least one of the positive electrode column and the negative electrode column may not be located in the through hole.

[0121] In some embodiments, the conductive interposer 4 may include a sheet structure, and the conductive interposer 4 may be a conductive metal, such as at least one of silver, copper, and aluminum.

[0122] In some embodiments, refer to Figure 19 As shown, at least part of the structure of the acquisition unit 31 may extend in a direction intersecting the first direction into the through hole 21.

[0123] In some embodiments (not shown in the figure), the acquisition unit may not be located in the through hole. For example, a partial structure of the electrical connection structure passing through the through hole may be located outside the through hole, and the acquisition unit may be connected to a part of the electrical connection structure located outside the through hole.

[0124] In some embodiments, refer to Figure 19 As shown, the separator 2 may be provided with a wire harness hole 23, and the wire harness hole 23 communicates with the through hole 21. The wire harness 32 of the signal acquisition member 3 may extend from the through hole 21 through the wire harness hole 23 to the outside of the separator 2.

[0125] In some embodiments, refer to Figures 2 - 3 As shown, within the same battery cell 1, both the positive electrode terminal 11 and the negative electrode terminal 12 may be provided on the side structural wall 133 of the housing 13 of the battery cell 1, rather than on the top structural wall 131 of the housing 13 of the battery cell 1, and the explosion-proof valve (not shown in the figure) of the battery cell 1 may be provided on the top structural wall 131. When the internal pressure of the battery cell increases and the explosion-proof valve ejects gas or even electrolyte, the ejected gas or electrolyte is not easily damaged to the positive electrode terminal or the negative electrode terminal of an adjacent battery cell. If the positive electrode terminal or the negative electrode terminal is located in the through hole of the separator, and the separator can play a protective role, then the ejected gas or electrolyte is even less likely to damage the positive electrode terminal or the negative electrode terminal of an adjacent battery cell.

[0126] In other embodiments, the explosion-proof valve may also be located on the bottom structural wall 132 of the housing 13 of the battery cell 1, and a space for the explosion-proof valve to eject gas or electrolyte may be left below the bottom structural wall 132 within the battery pack.

[0127] In other embodiments, refer to Figures 2 - 3 As shown, the side structural wall 133 of the housing 13 of the battery cell 1 may include two first side structural walls 1331 arranged back to back with each other in the first direction (for example, a direction parallel to the direction X) and two second side structural walls 1332 arranged back to back with each other in the second direction (for example, a direction parallel to the direction Y). The positive electrode terminal 11 is provided on one of the first side structural walls 1331, the negative electrode terminal 12 is provided on the other first side structural wall 1331, and the explosion-proof valve (not shown in the figure) may be provided on any one of the second side structural walls 1332.

[0128] In summary, it is sufficient that the positive electrode terminal, the negative electrode terminal, and the explosion-proof valve are located on different structural walls of the battery cell.

[0129] In some embodiments, please refer to Figures 2 - 3 As shown, within the same battery cell 1, the battery cell 1 includes two first side structural walls 1331 disposed back to back in a first direction (e.g., a direction parallel to the direction X) and two second side structural walls 1332 disposed back to back in a second direction (e.g., a direction parallel to the direction Y). The first direction and the second direction may be perpendicular to each other, and the area of any one of the first side structural walls 1331 is greater than the area of any one of the second side structural walls 1332.

[0130] In other embodiments, the first direction (parallel to the direction X) and the second direction (not parallel to the direction Y) may not be perpendicular either.

[0131] The positive electrode terminal 11 is disposed on one of the first side structural walls 1331, and the negative electrode terminal 12 is disposed on the other first side structural wall 1331. In this setting, when the positive electrode terminal 11 and the negative electrode terminal 12 generate heat, the heat dissipation area of the first side structural wall 1331 is relatively large, which is conducive to rapid heat dissipation.

[0132] In some embodiments, please refer to Figure 4 As shown, within the same battery cell 1, the projection range of the positive electrode terminal 11 on the first side structural wall 1331 along the first direction does not overlap with the projection range of the negative electrode terminal 12 on the first side structural wall 1331 along the first direction. Please refer to Figure 20 As shown, within the same battery cell, the projection range of the positive electrode terminal on the first side structural wall 1331 along the first direction is the first range TY1, and the projection range of the negative electrode terminal on the first side structural wall 1331 along the first direction is the second range TY2. The first range TY1 and the second range TY2 do not overlap. Therefore, even if the positive electrode terminal and the negative electrode terminal generate heat, the distance between the positive electrode terminal and the negative electrode terminal is relatively far. For example, the distance between the positive electrode terminal and the negative electrode terminal is greater than the width dimension of the battery cell in the first direction X. This setting is conducive to the rapid heat dissipation of the positive electrode terminal and the negative electrode terminal, and the heat distribution inside the battery cell is also relatively uniform, reducing the possibility of thermal runaway problems occurring inside the battery cell.

[0133] Among them, please refer to Figure 20 As shown, within the same battery cell, the projection of the connection line between the positive electrode terminal and the negative electrode terminal on the first side structural wall 1331 along the first direction is the projection line J. The projection line J may be the diagonal of the first side structural wall 1331, or the projection line L may be parallel to the diagonal of the first side structural wall 1331, or the included angle between the projection line L and the diagonal of the first side structural wall 1331 may be within the range of 0° to 10°.

[0134] In other embodiments, within the same battery cell, the projection range of the positive electrode terminal along the first direction on the first side structural wall may also overlap with the projection range of the negative electrode terminal along the first direction on the first side structural wall.

[0135] In some embodiments, please refer to Figure 21 As shown, the portion of the wire harness 32 located outside the separator 2 may be attached to some edges around the separator 2.

[0136] In some embodiments, please refer to Figure 21 As shown, the portion of the wire harness 32 located outside the separator 2 may be bonded to some edges around the separator 2.

[0137] In some embodiments, the top of the separator 2 may be lower than the top of the battery cell, and the portion of the wire harness 32 located at the top of the separator 2 may still be located within the spaced space between two battery cells, having the advantage of a relatively high degree of structural compactness.

[0138] In some embodiments, the battery pack includes at least two columns of battery cells. As Figure 22 shown, the battery pack may include a first column of battery cells 101 and a second column of battery cells 102. Both the first column of battery cells 101 and the second column of battery cells 102 include at least two battery cells 1 connected in series. The first column of battery cells 101 and the second column of battery cells 102 may be connected in series or in parallel.

[0139] Please refer to Figure 23 As shown, the separator 2 may include a connected first separator portion 2a and a second separator portion 2b. At least two first separator portions 2a spaced apart in the X direction are connected to both sides of the second separator portion 2b in the Y direction. The first separator portion 2a is used to separate two adjacent battery cells within the same column of battery cells. The first separator portion 2a is provided with a through hole (not shown in the figure) for being penetrated by an electrical connection structure (including a positive electrode terminal and a negative electrode terminal). The setting position of the through hole in the first separator portion 2a is adapted to the position of the electrode terminal (positive electrode terminal or negative electrode terminal) of the battery cell to be paired. One side of the second separator portion 2b is for placing the first column of battery cells, and the other side of the second separator portion 2b is for placing the second column of battery cells, that is, the second separator portion 2b is used to separate two columns of battery cells.

[0140] In some embodiments, the portion of the wire harness located outside the separator 2 may be arranged at local parts of the four peripheries of the first separator portion 2a and local parts of the four peripheries of the second separator portion 2b. Or, the portion of the wire harness buried in the separator 2 may be buried in the first separator portion 2a and the second separator portion 2b. It can also be said that Figure 23 the shown separator 2 can serve as an installation carrier for the wire harness.

[0141] In other embodiments, the separator 2 may mainly include Figure 23 the first separation part 2a in

[0142] Please refer to Figure 24 As shown, the signal acquisition component 3 may include a first group of signal acquisition components 3a and a second group of signal acquisition components 3b. The first group of signal acquisition components 3a may include a wire harness 32. The wire harness 32 may include a main wire harness 321 and at least two branch wire harnesses 322. The main wire harness 321 is connected to the battery management unit. The branch wire harnesses 322 are branches of the main wire harness 321. Each branch wire harness 322 is connected with an acquisition part 31. The branch wire harnesses 322 and the corresponding acquisition parts 31 may be provided on both sides of the main wire harness 321 in the direction Y. The structural setting of the second group of signal acquisition components 3b is similar to that of the first group of signal acquisition components 3a, and will not be elaborated here. Figure 24 The signal acquisition component 3 shown in Figure 22 may be used to acquire the signals of two columns of battery cells shown in

[0143] During use, if the same battery cell includes a positive electrode post and a negative electrode post that are offset in the height direction (the direction parallel to the direction Z), that is, the positive electrode post and the negative electrode post of the same battery cell are not at the same height, then Figure 24 the first group of signal acquisition components 3a shown in Figure 24 may be used to acquire the signals of the higher-positioned electrode posts, while

[0144] According to the number of different battery cells, Figure 24 the number of the branch wire harnesses 322 and the acquisition parts 31 shown in

[0145] Figure 24 The branch wire harnesses 322 shown in Figure 23 may be installed in the first separation part 2a in Figure 24 The main wire harness 321 shown in Figure 23 may be installed in the second separation part 2b in . The specific installation method has been described above and will not be elaborated here.

[0146] In other embodiments, please refer to Figure 25 As shown, the wire harness 32 of the signal acquisition component 3 may include a connected main wire harness 321 and branch wire harnesses 322. Each branch wire harness 322 may be connected with an acquisition part 31. Figure 25 The signal acquisition component 3 shown in Figure 25The signal acquisition component 3 shown in the figure.

[0147] In some embodiments, the battery cell may be a secondary battery (also known as a rechargeable battery or a storage battery), which refers to a battery that can be activated by charging after discharging so that it can continue to be used.

[0148] In some embodiments, in addition to the battery cells, the separator, and the signal acquisition component described above, the battery pack may further include a battery pack housing. The battery cells, the separator, and the signal acquisition component are all located inside the battery pack housing. The battery pack may further include a battery management unit located inside the battery pack housing. The battery management unit is used to monitor the voltage, current, and temperature of the battery module (including the multiple electrically connected battery cells described above), and the battery management unit is also used to control the voltage and current of the battery module. The battery management unit is also used for self-diagnosis and fault recording. The battery pack may further include a frame assembly located inside the battery pack housing, and the frame assembly is used to fix the battery module.

[0149] In some embodiments, electrical connection mainly refers to the connection relationship in which two conductive structural components or substances can achieve the conductive function through physical contact.

[0150] In some embodiments, please refer to Figure 26 As shown in the figure, the multiple series-connected battery cells 1 included in the same column of battery cells may be arranged along the horizontal direction P (length direction or width direction) of the battery pack housing 50. The height direction Z of the battery cell 1 is perpendicular to the horizontal direction P of the battery pack housing 50. In other words, the height direction Z of the battery cell 1 is parallel to the height direction Q of the battery pack housing 50. Or, please refer to Figure 27 As shown in the figure, the multiple series-connected battery cells 1 included in the same column of battery cells may be arranged along the height direction Q of the battery pack housing 50. The height direction Z of the battery cell 1 is perpendicular to the height direction Q of the battery pack housing 50. In other words, the height direction Z of the battery cell 1 is parallel to the horizontal direction P of the battery pack housing 50.

[0151] In a second aspect, the present application provides an energy storage device, which includes an inverter, a battery management system (Battery Management System, BMS), and at least one battery pack described above.

[0152] An inverter is used to convert direct current into alternating current. The inverter has the advantages of high conversion efficiency, fast startup speed, high safety, etc., and can also have functions such as short - circuit, overload, over / under - voltage, and over - temperature protection. The battery management system is used to make the battery pack work within a safe operating range, and can control the charge - discharge power of the battery pack according to factors such as ambient temperature, battery state, and power consumption requirements, etc., to improve the safety of the battery pack, make the working state of the battery pack more reasonable, and thus be beneficial to improving the endurance and service life of the battery pack. According to the above text, the battery pack can include a battery management unit. In the case where the energy storage device includes at least two battery packs, the battery management system can be connected to at least two battery management units, so that the battery management system can control at least two battery packs and can detect the states of at least two battery packs.

[0153] The energy storage device can specifically be an energy storage box (also known as a large - scale energy storage device, applicable to technical fields such as large - scale industrial production or power distribution, etc.). The energy storage box includes an energy storage box body, and the energy storage box body has an accommodation space. The inverter, the battery management system, and the battery pack are all within this energy storage box body.

[0154] The energy storage device can specifically be an energy storage cabinet (also known as an industrial and commercial energy storage device, applicable to small - scale industrial and commercial electricity needs). The energy storage cabinet includes an energy storage cabinet body, and the energy storage cabinet body has an accommodation space. The inverter, the battery management system, and the battery pack are all within this energy storage cabinet body.

[0155] In a third aspect, the present application provides an electrical equipment, and the alias of the electrical equipment can be an electrical system. The electrical equipment can include the energy storage device described above, and the electrical equipment can be an electric vehicle, a power grid, a household appliance, etc.

[0156] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery pack, characterized in that: The battery pack includes a signal acquisition component, a separator and at least two battery cells; In the same battery cell, the battery cell includes a positive electrode column and a negative electrode column arranged opposite to each other in a first direction, two first side structural walls arranged opposite to each other in the first direction, and two second side structural walls arranged opposite to each other in a second direction, the second direction intersecting the first direction, the area of any first side structural wall being greater than the area of any second side structural wall, the positive electrode column being arranged on one of the first side structural walls, and the negative electrode column being arranged on the other first side structural wall; At least two of the battery cells are distributed along the first direction and electrically connected in series, and in the two battery cells electrically connected in series, the positive electrode column of one of the battery cells and the negative electrode column of the other battery cell face each other and are electrically connected; The shells of at least two battery cells distributed along the first direction are separated by the separator, and the separator is provided with a through hole, and an electrical connection structure including the electrically connected positive electrode column and the negative electrode column is passed through the through hole, and the signal acquisition component includes a collection part, which is located in the interval space between the two battery cells spaced apart along the first direction, and the collection part is connected to the electrical connection structure.

2. The battery pack according to claim 1, wherein: In the electrical connection structure, the positive electrode column and the negative electrode column are directly electrically connected; At least a portion of the structure of the positive electrode column is located in the through hole, and / or at least a portion of the structure of the negative electrode column is located in the through hole.

3. The battery pack according to claim 2, wherein: In the electrical connection structure, at least one of the positive electrode column and the negative electrode column is provided with a receiving notch; The collecting portion is located at the accommodating notch, and the collecting portion is clamped by the positive electrode column and the negative electrode column.

4. The battery pack according to claim 3, characterized in that: The negative electrode column is provided with the accommodating notch, and the accommodating notch is recessed in the end surface of the negative electrode column and extends to the side surface of the negative electrode column; Alternatively, the positive electrode column is provided with the accommodating notch, and the accommodating notch is recessed in the end surface of the positive electrode column and extends to the side surface of the positive electrode column.

5. The battery pack according to claim 1, wherein: The electrical connection structure further includes a conductive intermediary, at least a portion of which is located within the through hole; In the electrical connection structure, the positive electrode column is indirectly electrically connected to the negative electrode column through the conductive intermediary; The signal collecting component includes at least two collecting parts, and at least two of the collecting parts are connected to the conductive intermediate component.

6. The battery pack according to claim 5, characterized in that: The conductive intermediary is also connected to the separator.

7. The battery pack according to claim 5, characterized in that: In the electrical connection structure, the conductive intermediary is located in the through-hole, and at least a portion of the structure of the positive electrode column is located in the through-hole. The projection range of the positive electrode column along the first direction on the plane where the separator is located is range α, and the projection range of the conductive intermediary along the first direction on the plane where the separator is located is range γ, and the range α and the range γ at least partially overlap. And / or, in the electrical connection structure, the conductive intermediary is located in the through hole, at least part of the structure of the negative electrode column is located in the through hole, the projection range of the negative electrode column along the first direction on the plane where the separator is located is range β, and the projection range of the conductive intermediary along the first direction on the plane where the separator is located is range γ, and the range β at least partially overlaps with the range γ.

8. The battery pack according to any one of claims 1 to 7, wherein: At least a portion of the collecting portion extends into the through hole along a direction intersecting the first direction.

9. The battery pack according to any one of claims 1 to 7, wherein: The signal acquisition component further includes a wiring harness connected to the acquisition portion; The partition is provided with a notch, which is communicated with the through hole, and the wiring harness extends from the through hole through the notch to the outside of the partition. Alternatively, a wiring harness hole is buried in the partition, which is communicated with the through hole, and the wiring harness extends from the through hole through the wiring harness hole to the outside of the partition. Alternatively, a wiring harness groove is recessed in the partition, which is communicated with the through hole, and the wiring harness extends from the through hole through the wiring harness groove to the outside of the partition.

10. The battery pack according to any one of claims 1 to 7, characterized in that: In the same battery cell, the projection range of the positive electrode column along the first direction on the first side structural wall is a first range, and the projection range of the negative electrode column along the first direction on the first side structural wall is a second range, and the first range and the second range do not overlap.

11. The battery pack according to any one of claims 1 to 7, wherein: The battery cell further includes an explosion-proof valve. In the same battery cell, the positive electrode column, the negative electrode column and the explosion-proof valve are located on different structural walls of the battery cell.

12. The battery pack according to any one of claims 1 to 7, wherein: The material of the separator includes insulating material and / or heat-insulating material.

13. The battery pack according to any one of claims 1 to 7, characterized in that: The partition is provided with a flow channel for the flow of the coolant.

14. An energy storage device, characterized in that: The energy storage device comprises the battery pack according to any one of claims 1 to 13.

15. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to claim 14.

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