Battery assembly, battery pack and electrical device

Abstract

Disclosed in the present application are a battery assembly, a battery pack and an electrical device. The battery assembly comprises at least two battery cells and at least one conductive connecting member; the connecting member comprises a first surface, an intermediate connecting portion and a second surface which are connected in sequence, the first surface being connected to one of two adjacent battery cells, and the second surface being connected to the other of the two adjacent battery cells; the connecting member is a cooling member. The cross-sectional area of the connecting member of the present application is relatively large, thereby increasing the overcurrent area of the connecting member and improving the overcurrent capability. In the present application, the heat generated by the current can be directly cooled by means of the connecting member.

Description

Battery assembly, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202411397643.4, filed on September 30, 2024, and entitled "Battery assembly, battery pack and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and more particularly, to a battery assembly, a battery pack and an electric device. BACKGROUND

[0003] With the popularization of the new energy industry, power batteries (including lithium ion batteries and sodium ion batteries) as an energy device have been widely used in the field of vehicles and the like.

[0004] The battery assembly is connected by a plurality of battery monomers, and the battery monomer contains a battery cell. In the related art, the plurality of battery cells are generally connected by a connecting piece. Specifically, the connecting piece has a connecting end, the connecting end directly contacts with the tab of the battery cell, and the connecting piece is connected with the tab of the battery cell through the connecting end. However, the above connection method has poor overcurrent capacity of the connecting piece, and in addition, the battery has poor heat dissipation capacity. SUMMARY

[0005] The purpose of the present application is to provide a battery assembly, a battery pack and an electric device, which can increase the cross-sectional area of the connecting piece under the premise of meeting the electrical conductivity of the connecting piece, thereby increasing the overcurrent area of the connecting piece, and maximizing the overcurrent capacity of the connecting piece; at the same time, the heat generated by the current in the present application can be directly cooled by the connecting piece, thereby helping to continuously remove the heat source and improving the safety performance of the battery.

[0006] In a first aspect, the present application discloses a battery assembly, comprising at least two battery monomers and at least one electrically conductive connecting piece, the connecting piece is arranged between two adjacent battery monomers; the connecting piece comprises a first surface, an intermediate connecting portion and a second surface connected in sequence; the first surface is connected with one of the two adjacent battery monomers, and the second surface is connected with the other of the two adjacent battery monomers; wherein the connecting piece is a cooling piece.

[0007] In some embodiments, a cooling channel is formed in the connecting piece.

[0008] In some embodiments, the cooling channel has an inlet and an outlet, the inlet and the outlet are located on the surface of the connecting piece, and are arranged in different planes from the first surface and the second surface.

[0009] In some embodiments, the cooling channel has an inlet and an outlet, and the inlet and the outlet are located on the same surface of the connecting piece.

[0010] In some embodiments, the connecting piece further comprises a third surface and a fourth surface, the inlet and the outlet are located on the third surface, and the terminal end of the cooling channel is located on a side close to the fourth surface in the middle connecting part.

[0011] In some embodiments, the first surface and the second surface are oppositely arranged, and the third surface and the fourth surface are oppositely arranged.

[0012] In some embodiments, a partition plate is arranged in the cooling channel, the cooling channel is partitioned into a liquid inlet channel and a liquid outlet channel by the partition plate, and at least part of the liquid inlet channel and at least part of the liquid outlet channel are communicated.

[0013] In some embodiments, the battery cell comprises a cell core, a positive electrode and a negative electrode are arranged on the cell core, the first surface is connected with the positive electrode of one of the two adjacent cell cores, and the second surface is connected with the negative electrode of the other of the two adjacent cell cores.

[0014] In some embodiments, the two adjacent battery cells are welded by the connecting piece.

[0015] In some embodiments, the welding depth of the first surface and one of the two adjacent battery cells is between 1mm and 5mm, and / or the welding depth of the second surface and the other of the two adjacent battery cells is between 1mm and 5mm.

[0016] In a second aspect, the present application discloses a battery pack comprising a battery assembly.

[0017] In some embodiments, the number of the battery assemblies comprises a plurality, and two adjacent battery assemblies in the plurality of battery assemblies are connected by a connecting piece.

[0018] In a third aspect, the present application discloses a power consumption device comprising a power consumption device and a battery pack.

[0019] The battery assembly of the present application comprises at least two battery monomers and at least one conductive connecting piece arranged between the adjacent two battery monomers, and the connecting piece comprises a first surface, an intermediate connecting part and a second surface connected in sequence. In this way, the connecting piece can realize the connection between the adjacent two battery monomers through the first surface and the second surface, thereby ensuring the normal transmission of current and the conductivity of the connecting piece; at the same time, under the action of the intermediate connecting part, it helps to increase the cross-sectional area of the connecting piece, thereby increasing the overcurrent area of the connecting piece and maximizing the overcurrent capacity of the connecting piece; at the same time, the connecting piece is a cooling piece, so that the heat generated by the current in the present application can be directly cooled by the connecting piece, thereby helping to continuously remove the heat source, improving the safety performance of the battery, ensuring the normal work of the battery, and prolonging the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a structural schematic diagram of a battery assembly according to an embodiment of the present application;

[0021] FIG. 2 is a partial enlarged schematic view of part I in FIG. 1;

[0022] FIG. 3 is a structural schematic diagram of a battery assembly according to an embodiment of the present application;

[0023] FIG. 4 is a structural schematic diagram of a connecting piece of a battery assembly according to an embodiment of the present application;

[0024] FIG. 5 is a schematic diagram of the internal structure of a connecting piece of a battery assembly according to an embodiment of the present application;

[0025] FIG. 6 is a top view of a connecting piece of a battery assembly according to an embodiment of the present application.

[0026] Reference signs: 100-battery assembly; 110-battery monomer; 120-connecting piece; 121-first surface; 122-intermediate connecting part; 123-second surface; 124-third surface; 125-fourth surface; 126-cooling channel; 1261-liquid inlet channel; 1262-liquid outlet channel; 1263-isolation plate; 127-inlet; 128-outlet. DETAILED DESCRIPTION

[0027] The current battery monomers and the battery monomers are generally connected by welding a connecting piece, for example, the positive electrode of battery monomer A and the negative electrode of battery monomer B are connected by a connecting piece, the positive electrode of battery monomer B and the negative electrode of battery monomer C are connected by a connecting piece, and a series of battery monomers form a battery assembly.

[0028] Specifically, in the related art, the connecting piece has two connecting ends, one of which directly contacts and connects with the positive electrode lug of one of the adjacent two battery monomers, and the other of which directly contacts and connects with the negative electrode lug of the other of the adjacent two battery monomers, and the adjacent two battery monomers are connected by the connecting piece, thereby completing the transmission of current.

[0029] However, in the related art, the contact surface of the connecting end and the tab is the end surface of the connecting end, the cross-sectional area of the connecting end is small, the cross-sectional area of the entire connecting piece is small, the overcurrent area of the connecting piece is small, and the overcurrent capacity of the connecting piece is poor. In addition, the above connection method has poor heat dissipation capacity of the battery.

[0030] To solve the above technical problems, the embodiments of the present application provide a battery assembly, a battery pack and an electric device. In this way, the connecting piece can realize the connection between the two adjacent battery monomers through the first surface and the second surface, thereby ensuring the normal transmission of the current and ensuring the conductivity of the connecting piece. At the same time, the intermediate connecting part is arranged, which helps to increase the cross-sectional area of the connecting piece, thereby increasing the overcurrent area of the connecting piece and maximizing the overcurrent capacity of the connecting piece. At the same time, the heat generated by the current can be directly cooled by the connecting piece, thereby helping to continuously remove the heat source and improving the safety performance of the battery.

[0031] To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference signs represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] The embodiments of the present application provide a battery assembly 100, which can include a battery shell, a battery cell and a battery cover plate. The battery cover plate is covered on the battery shell, the battery cell is located in the battery shell, and the battery cell is provided with a positive electrode and a negative electrode.

[0033] In the embodiments of the present application, the battery cell can be a lithium battery cell, a sodium battery cell or an energy storage battery cell. The battery shell can be an aluminum shell. The present embodiment does not limit this.

[0034] In the embodiments of the present application, in one embodiment, the positive electrode can include a positive tab, and the negative electrode can include a negative tab. The positive tab and the negative tab are respectively connected to opposite sides of the battery cell. The battery cover plate can include a positive cover plate and a negative cover plate. The positive cover plate and the negative cover plate are installed on opposite sides of the battery shell. The positive cover plate is welded to the positive tab, and the negative cover plate is welded to the negative tab.

[0035] In another embodiment, the positive electrode can further include a positive electrode post, and the negative electrode can further include a negative electrode post. The positive electrode cover plate is connected to the positive electrode tab through the positive electrode post, and the negative electrode cover plate is connected to the negative electrode tab through the negative electrode post. This embodiment is not limited in this regard.

[0036] In the embodiments of the present application, referring to FIGS. 1-3, the battery assembly 100 can include at least two battery monomers 110 and at least one conductive connecting piece 120, and the connecting piece 120 is arranged between the adjacent two battery monomers 110.

[0037] In the embodiments of the present application, the number of battery monomers 110 and connecting pieces 120 is not limited. For example, the number of battery monomers 110 can be two, the number of connecting pieces 120 can be one, and the connecting piece 120 is arranged between the two battery monomers 110; or the number of battery monomers 110 can be three, the number of connecting pieces 120 can be two, and the two connecting pieces 120 are arranged between the adjacent two battery monomers 110; or the number of battery monomers 110 and connecting pieces 120 can be multiple. This embodiment is not limited in this regard.

[0038] In the embodiments of the present application, the connecting piece 120 is a conductive piece, which helps to ensure normal transmission of current and ensure the conductivity of the connecting piece 120. The conductive material of the connecting piece 120 is not limited. For example, the material of the connecting piece 120 can be a single metal, a metal alloy, or a non-metallic material with conductivity, such as pure copper, aluminum-copper composite, steel-aluminum composite, etc. This embodiment is not limited in this regard.

[0039] In the embodiments of the present application, referring to FIGS. 4 and 5, the connecting piece 120 includes a first surface 121 and a second surface 123. The first surface 121 is connected to one of the adjacent two battery monomers 110, and the second surface 123 is connected to the other of the adjacent two battery monomers 110. In this way, the adjacent two battery monomers 110 can be connected, thereby ensuring normal transmission of current and ensuring the conductivity of the connecting piece 120.

[0040] It should be noted that in the embodiments, the connection mode between the adjacent two battery monomers 110 and the connecting piece 120 is not limited.

[0041] For example, the adjacent two battery monomers 110 can be connected in series through the connecting piece 120, for example, the first surface 121 is connected to the positive electrode of one of the adjacent two battery monomers 110, and the second surface 123 is connected to the negative electrode of the other of the adjacent two battery monomers 110, thereby forming a series connection of the two battery monomers 110.

[0042] Alternatively, for example, two adjacent battery monomers 110 can be connected in parallel through the connecting piece 120, for example, the first surface 121 is connected with the positive electrode of one of the two adjacent battery monomers 110, and the second surface 123 is connected with the positive electrode of the other of the two adjacent battery monomers 110, thereby forming the parallel connection of the two battery monomers 110. The present embodiment is not limited in this regard.

[0043] It should be noted that the position, size, shape, etc. of the first surface 121 and the second surface 123 are not limited. For example, the first surface 121 and the second surface 123 can be opposite two end surfaces of the connecting piece 120, the first surface 121 and the second surface 123 can be curved surfaces, can be planes, or can be other shaped surfaces, and the size of the first surface 121 and the second surface 123 can be the same or different. The present embodiment is not limited in this regard, and can be set as needed.

[0044] In the present application, the first surface 121 and the second surface 123 are taken as examples of the opposite two end surfaces of the connecting piece 120.

[0045] In order to improve the overcurrent capacity of the connecting piece 120, in the present application, as shown in FIG. 4, the connecting piece 120 can further include an intermediate connecting portion 122, and the first surface 121, the intermediate connecting portion 122 and the second surface 123 are connected in sequence. It can be understood that the intermediate connecting portion 122 is located between the first surface 121 and the second surface 123, and the intermediate connecting portion 122 is not directly connected with the adjacent two battery monomers 110. In this way, it is helpful to increase the cross-sectional area of the connecting piece 120, thereby increasing the overcurrent area of the connecting piece 120, and maximizing the overcurrent capacity of the connecting piece 120.

[0046] It should be noted that the specific structure of the intermediate connecting portion 122 is not limited. For example, the intermediate connecting portion 122 can be a solid structure, and the first surface 121 and the second surface 123 are opposite two surfaces of the intermediate connecting portion 122; or, for example, the intermediate connecting portion 122 can be a frame structure. The present embodiment is not limited in this regard.

[0047] In order to further improve the heat dissipation capacity of the battery, in the present application, the connecting piece 120 is a cooling piece, so that the heat generated by the current in the present application can be directly cooled by the connecting piece 120, thereby helping to continuously remove the heat source, improving the safety performance of the battery, ensuring the normal work of the battery, and prolonging the service life of the battery.

[0048] In some embodiments, as shown in FIGS. 4 and 5, a cooling channel 126 can be formed in the connecting piece 120. It can be understood that the intermediate connecting portion 122 in the present application is a solid structure, and the cooling channel 126 is formed in the intermediate connecting portion 122. In some embodiments, as shown in FIGS. 4 and 5, a cooling channel 126 can be formed in the connecting piece 120. It can be understood that the intermediate connecting portion 122 in the present application is a solid structure, and the cooling channel 126 is formed in the intermediate connecting portion 122.

[0049] In the embodiments of the present application, the cooling channel 126 can inject cooling liquid, refrigerant or circulating air, so that on the basis of increasing the cross-sectional area of the connecting piece 120 and improving the overcurrent capacity of the connecting piece 120, the present application can also effectively cool the battery monomer 110. The heat generated by the battery monomer 110 can be directly cooled by the cooling liquid, refrigerant or circulating air and the like, and the heat can be continuously taken away.

[0050] In the embodiments of the present application, the forming mode of the cooling channel 126 is not limited. For example, the cooling channel 126 can be a separate cooling pipe installed inside the middle connecting part 122, and the cooling pipe can be a square pipe, a circular pipe or the like. Alternatively, the inner wall of the middle connecting part 122 itself can form the cooling channel 126. The present application is not limited in this embodiment.

[0051] It should be noted that in the related art, the cooling piece is generally arranged at the outermost side of the battery assembly 100, and the connecting piece is connected between two battery monomers 110. In the present application, the cooling piece and the connecting piece at the outermost side of the battery assembly 100 are removed, and the cooling piece and the connecting piece are combined to form the connecting piece 120 of the present application, which is connected between two battery monomers 110, so that cooling and overcurrent can be performed at the same time, and the cooling efficiency and the overcurrent efficiency are improved. At the same time, since the cooling piece and the connecting piece at the outermost side of the battery assembly 100 are removed, the space utilization rate of the battery pack is greatly improved, and the separate connecting piece is not needed for connection and transition, which helps to save material cost and simplify the module design.

[0052] In some embodiments, referring to FIGS. 5 and 6, the cooling channel 126 can have an inlet 127 and an outlet 128, and the inlet 127 and the outlet 128 are located on the surface of the connecting piece 120 and are arranged on different planes from the first plane 121 and the second plane 123.

[0053] In the embodiments of the present application, the opening shape, the opening number and the opening size of the inlet 127 and the outlet 128 are not limited. For example, the shape of the inlet 127 and the outlet 128 can be circular, square or other shapes, and the present application is not limited in this embodiment. For example, the inlet 127 and the outlet 128 can be opened on the same plane, or can be opened on different planes.

[0054] It should be noted that the different planes refer to that the planes where the inlet 127 and the outlet 128 are opened are not on the same plane as the first plane 121 and the second plane 123. For example, the inlet 127 can be opened on other planes of the middle connecting part 122, and the outlet 128 can also be opened on other planes of the middle connecting part 122. The present application is not limited in this embodiment.

[0055] In this way, on the one hand, the structural integrity of the first face 121 and the second face 123 is ensured, the connection stability of the first face 121 and the battery monomer 110 and the second face 123 and the battery monomer 110 is ensured, and then the normal transmission of the current is ensured; on the other hand, the injection of the cooling liquid, the refrigerant or the circulating wind is not affected, and the heat is not interfered.

[0056] In some embodiments, the cooling channel 126 has an inlet 127 and an outlet 128, and the inlet 127 and the outlet 128 are located on the same surface of the connecting piece 120. In this way, only the inlet 127 and the outlet 128 need to be opened on the same surface, which does not affect the structural integrity of the other surfaces of the connecting piece 120, and also helps to ensure the sealing of the connecting piece 120 to avoid the problem of cooling liquid leakage; moreover, the processing technology is simple, which is beneficial to improve the user experience.

[0057] It should be noted that the inlet 127 and the outlet 128 can also be the same opening, and the cooling liquid, the refrigerant or the circulating wind enters the cooling channel 126 through the opening, and after cooling the heat generated by the current, the heat is continuously taken away from the opening. In this way, it is beneficial to further simplify the processing technology, and the structural integrity of the connecting piece 120 can be further ensured, which is helpful to ensure the sealing of the connecting piece 120.

[0058] In some embodiments, referring to FIG. 5, the connecting piece 120 can also include a third face 124 and a fourth face 125, and the inlet 127 and the outlet 128 are located on the third face 124, and the terminal of the cooling channel 126 is located on one side of the intermediate connecting part 122 close to the fourth face 125.

[0059] In the embodiments of the present application, the positions, sizes and shapes of the third face 124 and the fourth face 125 are not limited. For example, the third face 124 and the fourth face 125 can be opposite two end faces of the connecting piece 120, the third face 124 and the fourth face 125 can be arc faces, can be planes, or can be other shaped faces, and the sizes of the third face 124 and the fourth face 125 can be the same or different. The embodiments do not limit this, and the specific settings can be made according to actual needs.

[0060] In the embodiments, the first face 121 and the second face 123 are mainly arranged oppositely, and the third face 124 and the fourth face 125 are mainly arranged oppositely. Specifically, the first face 121 and the second face 123 are mainly taken as two side faces of the connecting piece 120, the third face 124 is taken as a top face of the connecting piece 120, and the fourth face 125 is taken as a bottom face of the connecting piece 120.

[0061] In the embodiment, the terminal of the cooling channel 126 is located in the middle connecting part 122 close to one side of the fourth surface 125. In this way, the cooling length of the cooling channel 126 is maximized, so that the battery monomer 110 is effectively cooled to the maximum extent. The heat generated by the battery monomer 110 can be directly cooled by the cooling liquid, refrigerant or circulating air, and the heat is continuously taken away, so that the cooling effect of the battery monomer 110 is maximized, the normal work of the battery monomer 110 is ensured, the service life of the battery monomer 110 is prolonged, and the service life of the battery assembly 100 and the battery pack is prolonged.

[0062] In some embodiments, referring to FIGS. 4 and 5, the cooling channel 126 can be provided with a partition plate 1263. The cooling channel 126 is separated into a liquid inlet channel 1261 and a liquid outlet channel 1262 by the partition plate 1263. At least part of the liquid inlet channel 1261 and at least part of the liquid outlet channel 1262 are communicated.

[0063] It can be understood that the length of the partition plate 1263 is less than the length of the cooling channel 126. The liquid inlet channel 1261 and the liquid outlet channel 1262 are located on both sides of the partition plate 1263. The cooling liquid, refrigerant or circulating air enters from the liquid inlet channel 1261, circulates in the cooling channel 126 for one cycle, and then flows out from the liquid outlet channel 1262.

[0064] In this way, the partition plate 1263 can control the one-way flow of the cooling liquid, refrigerant or circulating air, so that the cooling liquid, refrigerant or circulating air can only flow from the liquid inlet channel 1261 to the liquid outlet channel 1262, but cannot flow in the opposite direction. In addition, the partition plate 1263 can be provided with a filter screen or other filtering elements, which can help to remove impurities or particles in the liquid, ensure the purity of the fluid, and further ensure the normal flow of the cooling liquid, refrigerant or circulating air.

[0065] In the embodiment, the arrangement of the partition plate 1263 is not limited. For example, the partition plate 1263 can be vertically placed in the cooling channel 126 along the length direction of the cooling channel 126, and the liquid inlet channel 1261 and the liquid outlet channel 1262 are located on the left and right sides of the partition plate 1263. Alternatively, the partition plate 1263 can be horizontally placed in the cooling channel 126, and the liquid inlet channel 1261 and the liquid outlet channel 1262 are located on the upper and lower sides of the partition plate 1263. The embodiment is not limited in this regard.

[0066] In some embodiments, the two adjacent battery cells 110 can be welded by the connecting piece 120. Specifically, welding is sequentially performed along the first face 121, the fourth face 125, the third face 124 and the second face 123 of the connecting piece 120, and a complete welding is performed, which is helpful to improve the welding strength and safety of the connecting piece 120 and the battery cell 110, and further improve the structural strength and safety of the battery assembly 100 and the battery pack, so as to maximize the structural strength and safety of the electrical equipment.

[0067] In some embodiments, the welding depth of the first face 121 and one of the two adjacent battery cells 110 can be between 1mm-5mm. For example, the welding depth of the first face 121 and one of the two adjacent battery cells 110 can be 1mm, 2mm, 3mm, 4mm, 5mm or any value between 1mm-5mm.

[0068] The welding depth of the second face 123 and the other of the two adjacent battery cells 110 can be between 1mm-5mm. For example, the welding depth of the second face 123 and the other of the two adjacent battery cells 110 can be 1mm, 2mm, 3mm, 4mm, 5mm or any value between 1mm-5mm.

[0069] By limiting the welding depth as described above, on the one hand, when the welding depth of the first face 121 and the second face 123 and the battery cell 110 is less than 1mm, the welding strength of the connecting piece 120 and the battery cell 110 cannot be ensured, and the structural strength and stability of the connecting piece 120 and the battery cell 110 is poor. On the other hand, when the welding depth of the first face 121 and the second face 123 and the battery cell 110 is greater than 5mm, if the connecting piece 120 is thin, it is easy to cause the risk of welding through the first face 121 or the second face 123, which is not conducive to ensuring the structural strength and structural sealing of the connecting piece 120.

[0070] Therefore, by limiting the welding depth of the first face 121 and one of the two adjacent battery cells 110 to be between 1mm-5mm, and the welding depth of the second face 123 and the other of the two adjacent battery cells 110 to be between 1mm-5mm. In this way, it is conducive to ensuring the welding strength of the connecting piece 120 and the battery cell 110, thereby maximizing the structural strength and stability of the connecting piece 120 and the battery cell 110, and also not easy to cause the risk of welding through the first face 121 or the second face 123, and maximize the structural strength and structural sealing of the connecting piece 120.

[0071] The battery pack can include a plurality of battery assemblies 100. Two adjacent battery assemblies 100 in the plurality of battery assemblies 100 can be connected by a connecting piece 120.

[0072] In the embodiments of the present application, the connection mode of the two adjacent battery assemblies 100 in the plurality of battery assemblies 100 is not limited. For example, the two adjacent battery assemblies 100 can be connected in series by the connecting piece 120, or the two adjacent battery assemblies 100 can be connected in parallel by the connecting piece 120. The present embodiment is not limited in this regard.

[0073] The power utilization device provided in the embodiments of the present application includes a power utilization apparatus and a battery pack, and the battery pack is used to provide electric energy for the power utilization apparatus.

[0074] The power utilization device in the embodiments of the present application can be a vehicle, for example, the vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. Correspondingly, the power utilization apparatus can be a driving mechanism of the vehicle, or a control system of the vehicle.

[0075] In addition, the power utilization device can also be other energy storage devices, such as a mobile phone, a portable device, a notebook computer, an electric toy, an electric tool, a ship and a spacecraft, etc. The spacecraft can include an airplane, a rocket, a space shuttle or a spaceship.

[0076] Since the power utilization device in the embodiments includes the battery pack described in any of the above embodiments, the power utilization device includes the structure and advantages of the battery pack, which will not be described herein.

[0077] The embodiments of the present application provide a battery assembly, a battery pack and a power utilization device, which include at least two battery monomers and at least one conductive connecting piece. The connecting piece is arranged between the two adjacent battery monomers, and the connecting piece includes a first surface, an intermediate connecting portion and a second surface connected in sequence. In this way, the connecting piece can realize the connection between the two adjacent battery monomers through the first surface and the second surface, thereby ensuring the normal transmission of the current and the conductivity of the connecting piece. At the same time, under the action of the intermediate connecting portion, the cross-sectional area of the connecting piece is increased, thereby increasing the overcurrent area of the connecting piece and maximizing the overcurrent capacity of the connecting piece. In addition, the connecting piece is a cooling piece, so that the heat generated by the current can be directly cooled by the connecting piece, thereby helping to continuously remove the heat source, improving the safety performance of the battery, ensuring the normal work of the battery and prolonging the service life of the battery.

[0078] Wherein, the terms of "upper", "lower" and the like are used to describe the relative position relationship of each structure in the drawings, only for the convenience of clear description, and not to limit the scope of the application, the change or adjustment of the relative relationship is also regarded as the scope of the application without substantial change of the technical content.

[0079] It should be noted that: in this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0080] In addition, in this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0081] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly, comprising: The battery assembly comprises: at least two battery monomers (110) and at least one conductive connecting piece (120) arranged between two adjacent battery monomers (110); the connecting piece (120) comprises a first surface (121), an intermediate connecting part (122) and a second surface (123) connected in sequence; the first surface (121) is connected with one of the two adjacent battery monomers (110), and the second surface (123) is connected with the other of the two adjacent battery monomers (110); wherein the connecting piece (120) is a cooling piece.

2. The battery assembly of claim 1, wherein, The connecting piece (120) has a cooling channel (126) formed therein.

3. The battery assembly of claim 2, wherein, The cooling channel (126) has an inlet (127) and an outlet (128), and the inlet (127) and the outlet (128) are located on the surface of the connecting piece (120) and are arranged on different surfaces from the first surface (121) and the second surface (123).

4. The battery assembly of claim 2, wherein, The cooling channel (126) has an inlet (127) and an outlet (128), and the inlet (127) and the outlet (128) are located on the same surface of the connecting piece (120).

5. The battery assembly of claim 4, wherein, The connecting piece (120) further comprises a third surface (124) and a fourth surface (125), the inlet (127) and the outlet (128) are located on the third surface (124), and the terminal end of the cooling channel (126) is located on the side of the intermediate connecting part (122) close to the fourth surface (125).

6. The battery assembly of claim 5, wherein, The first surface (121) and the second surface (123) are arranged opposite to each other, and the third surface (124) and the fourth surface (125) are arranged opposite to each other.

7. The battery assembly of any one of claims 2-5, wherein, The cooling channel (126) is provided with a partition plate (1263), and the cooling channel (126) is separated into a liquid inlet channel (1261) and a liquid outlet channel (1262) by the partition plate (1263), and at least part of the liquid inlet channel (1261) and at least part of the liquid outlet channel (1262) are communicated.

8. The battery assembly of any one of claims 1-7, wherein, The battery monomer (110) comprises a battery core, and the battery core is provided with a positive electrode and a negative electrode, the first surface (121) is connected with the positive electrode of one of the two adjacent battery cores, and the second surface (123) is connected with the negative electrode of the other of the two adjacent battery cores.

9. The battery assembly of any one of claims 1-7, wherein, The two adjacent battery monomers (110) are welded by the connecting piece (120).

10. The battery assembly of claim 9, wherein, The welding depth of the first surface (121) and one of the two adjacent battery monomers (110) is between 1mm-5mm; and / or, the welding depth of the second surface (123) and the other of the two adjacent battery monomers (110) is between 1mm-5mm.

11. A battery pack comprising the battery assembly of any one of claims 1-10.

12. The battery pack of claim 11, wherein, The number of battery assemblies comprises a plurality of battery assemblies, and two adjacent battery assemblies in the plurality of battery assemblies are connected by a connecting piece.

13. An electrical device, characterized by The battery pack of claim 11 or 12 is used in an electrical device.

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