Battery packs and electrical equipment

Abstract

The present application discloses a battery pack and electrical equipment, belonging to the field of battery technology. The battery pack includes a plurality of battery cells arranged in sequence along a first direction. The battery cells include: a housing having an end cap and a peripheral wall, the peripheral wall enclosing an opening, the end cap being disposed over the opening; a pole, the pole being disposed on the end cap; and a pole plate, the pole plate including an end plate and a side plate connected to each other, the end plate being electrically connected to the pole, the side plate being disposed on the peripheral wall. Two adjacent battery cells along the first direction are electrically connected to each other via their respective side plates. This battery pack can effectively solve the technical problem in the prior art of using a busbar to connect the battery cells, which results in large fluctuations in the electrical connection effect.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and electrical equipment. Background Art

[0002] Batteries are widely used in electrical equipment such as new energy vehicles, electric bicycles, mobile phones, tablet computers, laptops, wind turbines, solar power stations, etc.

[0003] Traditional square battery cells are electrically connected to each other by welding a busbar to each battery cell pole. The electrical connection between the battery cells is greatly affected by structural defects of the busbar itself and the welding effect between the busbar and the pole. Summary of the Invention

[0004] Purpose of the invention: An embodiment of the present application provides a battery pack, aiming to solve the technical problem in the prior art of using a bus to connect each battery cell, which results in large fluctuations in the electrical connection effect; another purpose of the present application is to provide an electrical device.

[0005] Technical solution: A battery pack according to an embodiment of the present application includes a plurality of battery cells arranged in sequence along a first direction, wherein the battery cells include:

[0006] A housing, the housing having an end cover and a peripheral wall, the peripheral wall enclosing an opening, and the end cover covering the opening;

[0007] A pole, the pole being arranged on the end cover;

[0008] A pole piece, the pole piece comprising an end pole piece and a side pole piece connected to each other, the end pole piece being electrically connected to the pole, and the side pole piece being provided on the peripheral wall;

[0009] Wherein, along the first direction, two adjacent battery cells are electrically connected to each other through their respective side electrodes.

[0010] In some embodiments, the terminal plate is provided on the end cover.

[0011] In some embodiments, in the battery cell, two of the terminal sheets and two of the terminal posts are provided, and the terminal sheets and the terminal posts are connected in a one-to-one correspondence; the peripheral wall includes two first surfaces and two second surfaces that are oppositely disposed, and the area of the first surface is larger than the area of the second surface;

[0012] The side pole piece is arranged on the first surface; or, the side pole piece is arranged on the second surface; or, the side pole piece of one of the pole pieces is arranged on the second surface, and the side pole piece of the other pole piece is arranged on the first surface.

[0013] In some embodiments, along the first direction, the first surfaces of two adjacent battery cells are arranged opposite to each other;

[0014] The side electrode sheet is arranged on the second surface; or the side electrode sheet of one of the pole sheets of the battery cell is arranged on the first surface, and the side electrode sheet of another pole sheet is arranged on the second surface.

[0015] In some embodiments, the two electrode sheets of the battery cell are respectively a positive electrode sheet and a negative electrode sheet;

[0016] The positive electrode posts are connected and the negative electrode posts are connected to connect two adjacent battery cells in parallel; or the positive electrode posts of one battery cell are connected to the negative electrode posts of another adjacent battery cell to connect two adjacent battery cells in series.

[0017] In some embodiments, along the first direction, the second surfaces of two adjacent battery cells are arranged opposite to each other;

[0018] The side electrode sheet is provided on the first surface; or the side electrode sheet of one of the pole sheets of the battery cell is provided on the first surface, and the side electrode sheet of the other pole sheet is provided on the second surface.

[0019] In some embodiments, the pole piece includes two side pole pieces, the two side pole pieces are arranged on the two first surfaces in a one-to-one correspondence, and the two side pole pieces are connected to both sides of the end pole piece.

[0020] In some embodiments, the side electrode piece includes a protruding section and a receiving section, and the receiving section connects the end electrode piece and the protruding section;

[0021] The protruding sections of two adjacent battery cells are butted against each other.

[0022] In some embodiments, the receiving section is provided on the first surface, and the protruding section extends from a side of the receiving section close to the second surface and exceeds an edge of the first surface; or

[0023] The receiving section is provided on the second surface, and the protruding section extends from a side of the receiving section close to the first surface and exceeds an edge of the second surface.

[0024] In some embodiments, the battery cell further comprises:

[0025] An insulating layer is provided between the side electrode and the peripheral wall.

[0026] In some embodiments, further comprising:

[0027] A liquid cooling plate is arranged along the first direction, and covers part of the peripheral wall and at least part of the side pole piece.

[0028] In some embodiments, further comprising:

[0029] A heat conducting member is provided between the liquid cooling plate and the battery cell.

[0030] Accordingly, an electrical device described in an embodiment of the present application includes the battery pack described in any one of the above items.

[0031] Beneficial effect: Compared with the prior art, the battery pack of the embodiment of the present application includes a plurality of battery cells arranged in sequence along a first direction, and the battery cells include: an outer shell, the outer shell has an end cover and a peripheral wall, the peripheral wall encloses an opening, and the end cover is covered on the opening; a pole, the pole is arranged on the end cover; a pole sheet, the pole sheet includes an end pole sheet and a side pole sheet connected to each other, the end pole sheet is electrically connected to the pole, and the side pole sheet is arranged on the peripheral wall; wherein, along the first direction, two adjacent battery cells are electrically connected to each other through their respective side pole sheets. The battery cells of the battery pack are connected to the poles by setting pole pieces, which include end pole pieces provided on the end cover and side pole pieces provided on the peripheral wall. On the one hand, the side pole pieces can be used to connect with the side pole pieces of adjacent battery cells to realize electrical connection between adjacent battery cells, and there is no need to set up bus bars and pole welding, which avoids the influence of structural defects of the bus bars themselves, the effect of welding the bus bars and poles, etc. on the electrical connection between the battery cells, improves the stability of the electrical connection, and saves the step of welding the bus bars, and saves the process and materials of welding the bus bars, thereby reducing costs; on the other hand, the electrical connection is realized by the pole pieces provided on the surface of the outer shell. Under the same overcurrent capacity, the pole pieces are thinner and have a larger area, which increases the metal heat dissipation surface, correspondingly improves the heat dissipation effect of the battery pack, and reduces the risk of thermal runaway; furthermore, the pole pieces are thinner, which correspondingly reduces the space occupied by the battery cells, and also saves the space occupied by the bus bars, which is conducive to improving the volume utilization rate of the battery pack.

[0032] Compared with the prior art, it can be understood that the electrical equipment of the embodiment of the present application can have all the technical features and beneficial effects of the above-mentioned battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1is a schematic diagram of the three-dimensional structure of a battery cell provided in the first embodiment of the present application;

[0035] Figure 2 1 is a schematic top view of the battery cell provided in the first embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the three-dimensional structure of the battery pack provided in the first embodiment of the present application;

[0037] Figure 4 yes Figure 3 Schematic diagram of the exploded structure of the battery pack parts;

[0038] Figure 5 yes Figure 4 Schematic diagram of the structure where the parts of the battery pack further explode;

[0039] Figure 6 is a schematic diagram of the three-dimensional structure of a battery cell provided in the second embodiment of the present application;

[0040] Figure 7 is a schematic top view of the structure of a battery cell provided in the second embodiment of the present application;

[0041] Figure 8 is a schematic diagram of the three-dimensional structure of a battery pack provided in the second embodiment of the present application;

[0042] Figure 9 yes Figure 8 Schematic diagram of the exploded structure of the battery pack parts;

[0043] Figure 10 yes Figure 9 A schematic diagram of the structure of the middle A area;

[0044] Figure 11 yes Figure 9 Schematic diagram of the structure where the parts of the battery pack further explode;

[0045] Figure 12 This is a schematic diagram of the connection structure between battery cells in the second embodiment of the present application;

[0046] Figure 13 yes Figure 12 The main view;

[0047] Figure 14 1 is a schematic diagram of the exploded structure of the battery pack parts provided in the third embodiment of the present application;

[0048] Figure numerals: 1-battery pack; 10-battery cell; 20-housing; 30-liquid cooling plate; 40-liquid cooling pipe; 50-gap; 110-housing; 111-end cover; 112-peripheral wall; 1121-first side; 1122-second side; 120-pole piece; 121-end pole piece; 122-side pole piece; 1221-protruding section; 1222-receiving section; 130-pole. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0050] In the description of the present application, it should be understood that the terms "length", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0051] In the embodiments of the present application, "parallel" refers to a state where the angle formed between two lines, between a line and a plane, or between planes is between -10° and 10°. Furthermore, "perpendicular" refers to a state where the angle formed between two lines, between a line and a plane, or between planes is between 80° and 100°. Equal distances refer to a state where the tolerance range is between -10% and 10%.

[0052] The first embodiment of the present application provides a battery pack 1, which includes a plurality of battery cells 10 arranged in sequence along a first direction. Figure 1 and Figure 2 , Figure 1 The three-dimensional structure of the battery cell 10 of the first embodiment of the present application is shown. Figure 2 The top view of the battery cell 10 provided in the first embodiment of the present application is shown. It can be seen that the battery cell 10 includes a housing 110 , a terminal sheet 120 and a terminal 130 .

[0053] Specifically, the outer shell 110 includes an end cap 111 and a peripheral wall 112. The peripheral wall 112 encloses an opening, and the end cap 111 is covered at the opening. In some embodiments, the outer shell 110 includes two end caps 111, which can be the top cover and bottom plate of the battery cell 10 arranged oppositely. The peripheral wall 112 encloses to form a receiving cavity with openings at both ends. The receiving cavity is used to accommodate the bare battery cell (electrode assembly) of the battery cell 10. The two end caps 111 are respectively covered at the two openings of the receiving cavity; in some embodiments, the outer shell 110 includes an end cap 111, which can be the top cover of the battery cell 10. The peripheral wall 112 and the bottom plate of the battery cell 10 are connected and enclosed together to form a receiving cavity with an opening at one end. The end cap 111 is covered at the opening to seal the bare battery cell cover in the receiving cavity.

[0054] The pole 130 is provided on the end cap 111. Generally speaking, the same battery cell 10 may include two poles 130, one positive pole and one negative pole. The pole 130 passes through the end cap 111 and connects to the bare cell tab within the accommodating cavity to lead out the electrode. It is understood that when the housing 110 includes two end caps 111, the two poles 130 can be provided on different end caps 111, that is, the two poles 130 can be provided at both ends of the battery cell 10; of course, the two poles 130 can also be provided on the same end cap 111, that is, the two poles 130 can be provided at the same end of the battery cell 10.

[0055] The pole piece 120 is a metal sheet structure, and the pole piece 120 is connected to the pole 130 . Specifically, the pole piece 120 includes an end pole piece 121 and a side pole piece 122 connected to each other. The end pole piece 121 is electrically connected to the pole 130 , and the side pole piece 122 is provided on the peripheral wall 112 .

[0056] Please also refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 Schematic diagram of the three-dimensional structure of the battery pack 1 provided in the first embodiment of the present application; Figure 4 Indicated Figure 3 The exploded structure of the parts of the battery pack 1; Figure 5 Indicated Figure 4 The structure in which the parts of the battery pack 1 are further exploded; wherein the black double arrow indicates the first direction.

[0057] In which, along the first direction, two adjacent battery cells 10 are electrically connected to each other through their respective side electrodes 122 , that is, one battery cell 10 is connected to the side electrode 122 of another adjacent battery cell 10 through its side electrode 122 , so that the two adjacent battery cells 10 are electrically connected to each other.

[0058] It can be understood that the battery pack 1 is connected to other adjacent battery cells 10 through the side electrodes 122 of its battery cells 10 to achieve electrical connection between adjacent battery cells 10. Therefore, there is no need to set up a bus bar for electrical connection between the battery cells 10. The material cost of the bus bar can be reduced, and the process steps of welding the bus bar can be omitted, thereby reducing material costs and personnel operating costs.

[0059] In addition, the battery pack 1 of the embodiment of the present application does not need to use a busbar to weld the pole 130 to achieve electrical connection, which can avoid the structural defects of the busbar itself, the effect of welding the busbar and the pole, etc. that affect the electrical connection effect between the battery cells 10, and avoid electrical connection failure caused by the above problems. In terms of welding technology, the direct welding effect of the side plates 122 of the two battery cells 10 is better than welding the pole 130 through the busbar, and the heat generation at the welding point during charging and discharging after connection will also be alleviated.

[0060] Furthermore, the embodiment of the present application uses the pole piece 120 to achieve electrical connection. Under the same current capacity, the pole piece 120 is thinner and has a larger area, which increases the metal heat dissipation surface, correspondingly improves the heat dissipation effect, and reduces the risk of thermal runaway; furthermore, the pole piece 120 is thinner, which correspondingly reduces the space occupied by the battery cell 10, and also saves the space occupied by the bus, thereby improving the volume utilization rate of the battery pack 1.

[0061] In some embodiments, the battery cell 10 can be a cylindrical battery cell 10, and the peripheral wall 112 can be the side wall of the cylindrical battery cell 10. By setting the pole piece 120, its side pole piece 122 is set on the peripheral wall 112. When adjacent battery cells 10 are arranged side by side, the side pole pieces 122 of each battery cell 10 can be used for electrical connection to achieve the above-mentioned technical effect.

[0062] In some embodiments, the battery cell 10 is a square battery cell 10. Generally speaking, a square battery cell 10 has four side walls, and the peripheral wall 112 is a component formed by the four side walls being connected in sequence. The peripheral wall 112 includes two first surfaces 1121 and two second surfaces 1122 arranged opposite to each other. The area of the first surface 1121 is larger than the area of the second surface 1122, that is, the first surface 1121 is generally referred to as a large surface, and the second surface 1122 is generally referred to as a side surface. By providing a pole piece 120 and arranging its side pole piece 122 on the peripheral wall 112, when adjacent battery cells 10 are arranged side by side, the side pole piece 122 of each battery cell 10 can be used for electrical connection, and the above-mentioned technical effect can also be achieved. Of course, the battery cell 10 is not limited to a square battery cell 10, and can also be set to other shapes, such as a cylindrical battery with a regular hexagonal bottom surface.

[0063] Furthermore, in some embodiments, the battery cell 10 is provided with two electrode sheets 120 and two electrodes 130, and the electrode sheets 120 and the electrodes 130 are connected one-to-one. It is understood that the two electrodes 130 are respectively a positive electrode and a negative electrode, and accordingly, the two electrode sheets 120 are also respectively a positive electrode sheet and a negative electrode sheet.

[0064] Among them, Figure 1 As shown, in the first embodiment, the side electrode sheet 122 is provided on the first surface 1121, and the side electrode sheets 122 of the two pole sheets 120 are respectively provided close to the two second surfaces 1122. Thus, multiple battery cells 10 can be arranged in a manner that the second surfaces 1122 are opposite to each other (see Figures 3 to 5 ), so that the side electrodes 122 close to the two second surfaces 1122 can be connected to the battery cells 10 adjacent to both sides respectively, thereby realizing series connection between multiple battery cells 10.

[0065] Furthermore, in the first embodiment, the terminal plate 120 includes two side plates 122, which are provided on the two first surfaces 1121 in a one-to-one correspondence, and the two side plates 122 are connected to both sides of the terminal plate 121. On the one hand, the two side plates 122 can be used to connect to adjacent battery cells 10, improving the stability of the connection; on the other hand, by providing side plates 122 on both first surfaces 1121, the thin thickness and large area of the metal side plates 122 are utilized to improve heat dissipation efficiency.

[0066] Please combine Figures 6 to 13 , Figure 6 The three-dimensional structure of the battery cell 10 provided in the second embodiment of the present application is shown. Figure 7 The top view structure of the battery cell provided in the second embodiment of the present application is shown. Figure 8 The three-dimensional structure of the battery pack 1 provided in the second embodiment of the present application is shown. Figure 9 Indicated Figure 8 The exploded structure of the battery pack 1 parts, Figure 10 Indicated Figure 9 The enlarged structure of the A area in the middle, Figure 11 Indicated Figure 9 The structure of the battery pack parts further exploded, Figure 12 The connection structure between battery cells in the second embodiment of the present application is shown. Figure 13 Indicated Figure 12 The main visual structure of the present invention; wherein, the black double arrow indicates the first direction.

[0067] It can be seen that, unlike the first embodiment, in the second embodiment, the side electrode sheets 122 are arranged on the second surface 1122, and the side electrode sheets 122 of the two pole sheets 120 are respectively arranged close to the two first surfaces 1121. Thus, multiple battery cells 10 can be arranged in a manner that the first surfaces 1121 are opposite to each other (see Figures 8 to 13 ), so that the side electrode sheets 122 respectively close to the two first surfaces 1121 can be connected to the adjacent battery cells 10 on both sides, and thus multiple battery cells 10 can be connected in series. That is, the positive electrode sheet of a battery cell 10 is connected to the negative electrode sheet of an adjacent battery cell 10 located on one side thereof, thereby connecting the two adjacent battery cells 10 in series; at the same time, the negative electrode sheet of the battery cell 10 is connected to the positive electrode sheet of another adjacent battery cell 10 located on the other side thereof, thereby realizing multiple battery cells 10 being connected in series.

[0068] See also Figure 14 , Figure 14 The exploded structure of the parts of the battery pack 1 provided in the third embodiment of the present application is illustrated. Unlike the second embodiment, in the third embodiment, the positive electrode column sheets are interconnected, and the negative electrode column sheets are interconnected to connect two adjacent battery cells 10 in parallel, thereby realizing the parallel connection of multiple battery cells 10.

[0069] In some embodiments, the side electrode piece 122 of one of the two electrode pieces 120 can be disposed on the second surface 1122, and the side electrode piece 122 of the other electrode piece 120 can be disposed on the first surface 1121, and the other electrode piece 120 can be disposed close to the other second surface 1122. Thus, a plurality of battery cells 10 can be arranged with the first surfaces 1121 facing each other. Among three sequentially arranged battery cells 10, the middle battery cell 10 and one of its adjacent battery cells 10 are butted together via the side electrode pieces 122 disposed on the opposing first surfaces 1121 to achieve connection at one pole, and the other adjacent battery cells 10 are connected to each other via the side electrode pieces 122 disposed on their respective second surfaces 1122 to achieve connection at the other pole, thereby achieving series connection between the plurality of battery cells 10. Alternatively, multiple battery cells 10 may be arranged with their second surfaces 1122 facing each other. Among three sequentially arranged battery cells 10, the middle battery cell 10 and one adjacent battery cell 10 are butted against each other via the side electrode sheets 122 provided on the opposing second surfaces 1122 to achieve connection at one pole. The other adjacent battery cell 10 is connected to each other via the side electrode sheets 122 provided on their respective first surfaces 1121 to achieve connection at the other pole, thereby achieving series connection between the multiple battery cells 10. Alternatively, multiple battery cells 10 may be arranged with their first surfaces 1121 facing each other, with the side electrode sheets 122 provided on the first surface 1121 of two adjacent battery cells 10 both being positive or negative, and correspondingly, the side electrode sheets 122 provided on the second surface 1122 both being negative or positive. By connecting positive electrodes to positive electrodes and negative electrodes to negative electrodes, multiple battery cells 10 may be connected in parallel.

[0070] In some embodiments, the side electrode piece 122 includes a protruding section 1221 and a receiving section 1222 . The receiving section 1222 connects the end electrode piece 121 and the protruding section 1221 . The receiving section 1222 is provided on the peripheral wall 112 , and the protruding section 1221 is provided to protrude relative to the peripheral wall 112 .

[0071] In some embodiments, the protruding sections 1221 of two adjacent battery cells 10 are butted together to connect the side electrodes 122 to each other, thereby achieving electrical connection between the two adjacent battery cells 10 .

[0072] In some embodiments, the receiving section 1222 is disposed on the first surface 1121 , and the protruding section 1221 extends from a side of the receiving section 1222 close to the second surface 1122 and exceeds an edge of the first surface 1121 .

[0073] In some embodiments, the receiving section 1222 is disposed on the second surface 1122 , and the protruding section 1221 extends from a side of the receiving section 1222 close to the first surface 1121 and exceeds an edge of the second surface 1122 .

[0074] For details, please refer to Figure 1 and Figure 2 In the first embodiment of the present application, the receiving section 1222 is parallel to the first surface 1121, the protruding section 1221 extends outward from the edge of the first surface 1121, and the protruding section 1221 intersects with the second surface 1122. That is, in this embodiment, the receiving section 1222 is arranged parallel to the large surface of the battery cell 10, and the two can be arranged in contact with each other or spaced apart from each other. The protruding section 1221 and the receiving section 1222 can be connected to each other by welding, or the two can be directly arranged as an integrated structure. The protruding section 1221 protrudes outward from the edge of the first surface 1121 and intersects with the second surface 1122, that is, the plane defined by the protruding section 1221 and the second surface 1122 have an angle, which can be an acute angle, an obtuse angle or a right angle. Generally, in the square battery cell 10, the large surface (first surface 1121) and the side surface (second surface 1122) are roughly planes perpendicular to each other. Accordingly, the protruding section 1221 and the receiving section 1222 can be set as an integrated structure, and the extension directions of the protruding section 1221 and the receiving section 1222 are consistent, both parallel to the first surface 1121 and perpendicular to the second surface 1122.

[0075] In the second embodiment of the present application, the receiving section 1222 is parallel to the second surface 1122, the protruding section 1221 extends outward from the edge of the second surface 1122, and the protruding section 1221 intersects with the first surface 1121. That is, in this embodiment, the receiving section 1222 is arranged parallel to the side surface of the battery cell 10. Similar to the first embodiment, the receiving section 1222 and the side surface can be arranged in contact with each other or spaced apart from each other. The protruding section 1221 and the receiving section 1222 can be connected to each other by welding, or the two can be directly arranged as an integrated structure. The protruding section 1221 protrudes outward from the edge of the second surface 1122 and intersects with the first surface 1121, that is, the plane defined by the protruding section 1221 and the first surface 1121 have an angle, which can be an acute angle, an obtuse angle or a right angle. Similar to the first embodiment, the protruding section 1221 and the receiving section 1222 can be set as an integrated structure. The protruding section 1221 and the receiving section 1222 extend in the same direction, are parallel to the second surface 1122 and perpendicular to the first surface 1121 .

[0076] In the first embodiment, the second surfaces 1122 of two adjacent battery cells 10 are disposed opposite each other along a first direction. The two terminal plates 120 of each battery cell 10 are disposed adjacent to its two second surfaces 1122, respectively. The side plates 122 of each battery cell 10 are disposed on the first surface 1121. The protruding segments 1221 of each side plate 122 extend toward the other adjacent battery cells 10, i.e., in opposite directions, thereby enabling them to mate with the protruding segments 1221 of adjacent battery cells 10 to achieve electrical connection between the two adjacent battery cells 10. By rationally designing the length of the protruding segments 1221 of the battery cells 10 protruding from the second surface 1122, the gap 50 between adjacent battery cells 10 can be adjusted, thereby adjusting the spacing between the two adjacent battery cells 10. This effectively prevents the spread of thermal runaway caused by the close proximity of the two battery cells 10 when thermal runaway occurs in one battery cell 10.

[0077] Alternatively, in some embodiments, the second surfaces 1122 of two adjacent battery cells 10 are disposed opposite each other along the first direction. Of the two pole pieces 120 of the battery cell 10, the side pole piece 122 of one pole piece 120 is disposed on the first surface 1121, and the side pole piece 122 of the other pole piece 120 is disposed on the second surface 1122. Among the battery cells 10 arranged sequentially, the battery cell 10 located between the two battery cells 10 and one of its adjacent battery cells 10 are connected to each other via the side pole pieces 122 disposed on the opposing second surfaces 1122 to achieve one polarity connection. The battery cell 10 and its other adjacent battery cell 10 are connected to each other via the side pole pieces 122 disposed on their respective first surfaces 1121 to achieve another polarity connection, thereby achieving a series connection between multiple battery cells 10.

[0078] In the second embodiment, the first surfaces 1121 of two adjacent battery cells 10 are disposed opposite each other along a first direction. The side electrode sheets 122 of each battery cell 10 are disposed on the second surface 1122. The protruding sections 1221 of the two side electrode sheets 122 extend toward the other adjacent battery cells 10, i.e., in opposite directions, so that they can mate with the protruding sections 1221 of adjacent battery cells 10 to achieve electrical connection between the two adjacent battery cells 10. Accordingly, the length of the protruding sections 1221 of the battery cells 10 protruding from the first surface 1121 can be reasonably designed to adjust the size of the gap 50 between adjacent battery cells 10, thereby adjusting the spacing between the two adjacent battery cells 10. This can effectively prevent the spread of thermal runaway caused by the close proximity of the two battery cells 10 when thermal runaway occurs in one battery cell 10.

[0079] Alternatively, in some embodiments, along a first direction, the first surfaces 1121 of two adjacent battery cells 10 are disposed opposite each other. Of the two pole pieces 120 of the battery cell 10, the side pole piece 122 of one pole piece 120 is disposed on the first surface 1121, and the side pole piece 122 of the other pole piece 120 is disposed on the second surface 1122. Among the battery cells 10 arranged sequentially, the battery cell 10 located between the two battery cells 10 and one of its adjacent battery cells 10 are connected to each other via the side pole pieces 122 disposed on the opposing first surfaces 1121 to achieve one polarity connection. The battery cell 10 and its other adjacent battery cell 10 are connected to each other via the side pole pieces 122 disposed on their respective second surfaces 1122 to achieve another polarity connection, thereby achieving a series connection between multiple battery cells 10.

[0080] In the third embodiment, along the first direction, the first surfaces 1121 of two adjacent battery cells 10 are arranged opposite to each other. The two side electrodes 122 of each battery cell 10 are arranged on the two second surfaces 1122 thereof in a one-to-one correspondence, and the protruding sections 1221 of the two side electrodes 122 extend toward the direction of the other adjacent battery cells 10. Figure 14 As can be seen, protruding sections 1221 are provided on both sides of the connecting section 1222 along the first direction, that is, each side electrode 122 has two protruding sections 1221 extending in opposite directions, so that they can mate with the protruding sections 1221 of adjacent battery cells 10 on both sides to achieve electrical connection (parallel connection) between adjacent battery cells 10. Accordingly, by reasonably designing the length of the protruding sections 1221 of the battery cells 10 protruding from the first surface 1121, the size of the gap 50 between adjacent battery cells 10 can be adjusted, thereby adjusting the spacing between two adjacent battery cells 10. When thermal runaway occurs in a battery cell 10, the spread of thermal runaway caused by the close proximity of the two battery cells 10 can be effectively prevented.

[0081] In some embodiments, the battery cell 10 of the battery pack 1 further includes an insulating layer (not shown), which is disposed between the side electrode sheet 122 and the peripheral wall 112 to provide insulation protection between the side electrode sheet 122 and the peripheral wall 112. Specifically, the insulating layer can be an insulating coating, an insulating film, or other insulating means.

[0082] Furthermore, in some embodiments, the battery pack 1 also includes a box body 20, in which the above-mentioned battery cells 10 are arranged. Multiple battery cells 10 are arranged along a first direction and interconnected to form a battery pack. Multiple rows of the above-mentioned battery packs can be arranged along a direction perpendicular to the first direction.

[0083] Furthermore, in some embodiments, the battery pack 1 further includes a liquid cooling plate 30 , which is arranged along the first direction and covers a portion of the peripheral wall of the battery cell 10 and at least a portion of the side electrode 122 .

[0084] In some embodiments, when the first surfaces 1121 of adjacent battery cells 10 are positioned relative to each other, the liquid cooling plate 30 covers the second surfaces 1122 of the battery cells 10. When one electrode sheet 122 is positioned on the first surface 1121 and the other electrode sheet 122 is positioned on the second surface 1122, the liquid cooling plate 30 only covers the electrode sheet 122 positioned on the second surface 1122. Preferably, all the electrode sheets 122 of the battery cells 10 can be positioned on the second surface 1122, so that the liquid cooling plate 30 completely covers the electrode sheets 122, thereby improving the cooling effect on the electrode sheets 122.

[0085] In some embodiments, when the second surfaces 1122 of adjacent battery cells 10 are positioned opposite each other, the liquid cooling plate 30 covers the first surfaces 1121 of the battery cells 10. Similarly, when one electrode sheet 122 is positioned on the first surface 1121 and the other electrode sheet 122 is positioned on the second surface 1122, the liquid cooling plate 30 only covers the electrode sheet 122 positioned on the second surface 1122. Preferably, the electrode sheets 122 of all battery cells 10 can be positioned on the first surface 1121, so that the liquid cooling plate 30 completely covers the electrode sheets 122, thereby improving the cooling effect on the electrode sheets 122.

[0086] Furthermore, in the box 20, two adjacent rows of battery packs can share a liquid cooling plate 30, and multiple liquid cooling plates 30 transport coolant through liquid cooling pipes 40. Therefore, while ensuring the cooling effect, the space occupied by the liquid cooling system can be reduced, thereby improving the volume energy density of the battery pack 1.

[0087] In some embodiments, the battery pack 1 further includes a heat conductor (not shown) disposed between the liquid cooling plate 30 and the battery cells 10. The heat conductor enhances heat conduction between the liquid cooling plate 30 and the battery cells 10. For example, the heat conductor may be a thermal adhesive or other thermally conductive material, which is filled between the liquid cooling plate 30 and the battery cells 10. This not only improves the cooling effect on the terminal plate 120, but also allows the thermal adhesive to effectively adhere to the liquid cooling plate 30 during charge and discharge cycles, even when the battery cells 10 expand. This avoids a sudden drop in heat dissipation due to a reduction in heat exchange area, thereby ensuring cooling effectiveness and improving safety.

[0088] Accordingly, embodiments of the present application further provide an electrical device that may include the aforementioned battery cell 10, such as a portable computer, tablet computer, mobile phone, etc. Alternatively, the electrical device may include the aforementioned battery pack 1, such as a new energy vehicle, such as an electric car, electric bicycle, electric motorcycle, electric scooter, etc. It is understood that the electrical device may have all the technical features and beneficial effects of the aforementioned battery cell 10 or battery pack 1, and will not be further described here.

[0089] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] The above is a detailed introduction to the battery pack and electrical equipment provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack (1), characterized in that: The invention comprises a plurality of battery cells (10) arranged in sequence along a first direction, wherein the battery cells (10) comprise: A housing (110), the housing (110) having an end cover (111) and a peripheral wall (112), the peripheral wall (112) enclosing an opening, and the end cover (111) covering the opening; A pole (130), the pole (130) being provided on the end cover (111); A pole piece (120), the pole piece (120) comprising an end pole piece (121) and a side pole piece (122) connected to each other, the end pole piece (121) being electrically connected to the pole (130), and the side pole piece (122) being attached to the peripheral wall (112); A liquid cooling plate (30) is arranged on one side of the battery cell (10) and covers a portion of the peripheral wall (112) and at least a portion of the side electrode (122); Wherein, along the first direction, two adjacent battery cells (10) are electrically connected to each other through their respective side pole pieces (122), and the side pole pieces (122) include protruding sections (1221) protruding relative to the peripheral wall (112), and the protruding sections (1221) of each side pole piece (122) extend toward the other adjacent battery cell (10) and dock with the protruding sections (1221) of the other adjacent battery cell (10) to achieve electrical connection between the two adjacent battery cells (10) and to provide a gap between the two adjacent battery cells (10).

2. The battery pack (1) according to claim 1, characterized in that In the battery cell (10), two of each of the pole pieces (120) and the pole (130) are provided, and the pole pieces (120) and the pole (130) are connected in a one-to-one correspondence; the peripheral wall (112) includes two first surfaces (1121) arranged opposite to each other and two second surfaces (1122) arranged opposite to each other, and the area of the first surface (1121) is larger than the area of the second surface (1122); The side pole piece (122) is arranged on the first surface (1121); or, the side pole piece (122) is arranged on the second surface (1122); or, the side pole piece (122) of one of the pole pieces (120) is arranged on the second surface (1122), and the side pole piece (122) of the other pole piece (120) is arranged on the first surface (1121).

3. The battery pack (1) according to claim 2, characterized in that: Along the first direction, the first surfaces (1121) of two adjacent battery cells (10) are arranged opposite to each other; The side electrode piece (122) is arranged on the second surface (1122); or the side electrode piece (122) of one of the pole pieces (120) of the battery cell (10) is arranged on the first surface (1121), and the side electrode piece (122) of the other pole piece (120) is arranged on the second surface (1122).

4. The battery pack (1) according to claim 3, characterized in that The two pole pieces (120) of the battery cell (10) are respectively a positive pole piece and a negative pole piece; The positive electrode column sheets are connected and the negative electrode column sheets are connected to connect two adjacent battery cells (10) in parallel; or the positive electrode column sheet of one battery cell (10) is connected to the negative electrode column sheet of another adjacent battery cell (10) to connect two adjacent battery cells (10) in series.

5. The battery pack (1) according to claim 2, characterized in that: Along the first direction, the second surfaces (1122) of two adjacent battery cells (10) are arranged opposite to each other; The side electrode piece (122) is arranged on the first surface (1121); or the side electrode piece (122) of one of the pole pieces (120) of the battery cell (10) is arranged on the first surface (1121), and the side electrode piece (122) of the other pole piece (120) is arranged on the second surface (1122).

6. The battery pack (1) according to claim 5, characterized in that: The pole piece (120) includes two side pole pieces (122), the two side pole pieces (122) are arranged on the two first surfaces (1121) in a one-to-one correspondence, and the two side pole pieces (122) are connected to both sides of the end pole piece (121).

7. The battery pack (1) according to any one of claims 2 to 6, characterized in that: The side pole piece (122) further comprises a connecting section (1222), wherein the connecting section (1222) connects the end pole piece (121) and the protruding section (1221).

8. The battery pack (1) according to claim 7, characterized in that: The receiving section (1222) is provided on the first surface (1121), and the protruding section (1221) extends from a side of the receiving section (1222) close to the second surface (1122) and exceeds the edge of the first surface (1121); or, The receiving section (1222) is provided on the second surface (1122), and the protruding section (1221) extends from a side of the receiving section (1222) close to the first surface (1121) and exceeds the edge of the second surface (1122).

9. The battery pack (1) according to claim 1, characterized in that: The battery cell (10) further comprises: An insulating layer is provided between the side electrode (122) and the peripheral wall (112).

10. An electrical device, characterized in that: A battery pack (1) comprising the battery pack according to any one of claims 1 to 9.

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