Battery pack

Abstract

The embodiment of the utility model provides a battery pack, and the battery pack comprises a plurality of battery cells, the plurality of battery cells are arranged along a first direction and / or a second direction, one side of each battery cell along a third direction is provided with a pole, and the pole is provided with a first connecting part; and the electric connecting piece is connected between the two adjacent battery cells, the electric connecting piece is provided with a second connecting part, and the second connecting part is connected with the first connecting part in an embedded manner, so that the electric connection between the two adjacent battery cells is realized. According to the battery pack provided by the embodiment of the invention, current transmission is realized between the electric connecting piece and the battery cell through embedded connection, so that the problem of pseudo soldering caused by welding connection between the electric connecting piece and the battery cell is avoided, the connection between the electric connecting piece and the battery cell is more stable, the process is simpler, and the reliability and the assembly efficiency of the battery pack are improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack. Background Technology

[0002] With the rapid development of new energy technologies, battery packs are being used more and more widely in production and daily life. Typically, a battery pack contains multiple cells to meet the power needs of different electrical devices in various application scenarios. These cells are connected by welding plates to facilitate current transfer between them.

[0003] However, under this common connector structure, the space utilization rate of the battery pack is low, which restricts the increase of battery capacity. In addition, poor soldering is prone to occur between the connector and the cell, which affects the reliability of the battery pack. Moreover, the process is relatively complicated, which reduces the production efficiency of the battery pack. Utility Model Content

[0004] This application aims to provide a battery pack that at least solves the problem of poor soldering between the connecting pieces and the cells in existing battery packs, which affects the reliability of the battery pack.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] This application discloses a battery pack, including a first direction, a second direction, and a third direction that intersect each other, the battery pack comprising:

[0007] Multiple battery cells are arranged along the first direction and / or the second direction. Each battery cell has a terminal post on one side along the third direction, and the terminal post has a first connection portion.

[0008] An electrical connector is provided between two adjacent battery cells. The electrical connector is provided with a second connecting part, which is fitted and connected to the first connecting part to realize the electrical connection between the two adjacent battery cells.

[0009] Optionally, the first connecting part is one of the convex hull and the groove, and the second connecting part is the other of the convex hull and the groove. The convex hull and the groove are fitted together to realize the electrical connection between two adjacent battery cells.

[0010] Optionally, the battery cell includes a battery cell body and the terminal post, the terminal post protruding from the battery cell body along the third direction, and the first connecting portion is a groove, the groove being disposed on the terminal post and recessed toward the battery cell body;

[0011] The electrical connector includes a connector body and a protrusion, the protrusion forming the second connection portion, the protrusion protruding from the connector body, and the protrusion being at least partially embedded in the groove.

[0012] Optionally, the groove has an opening toward the convex hull along the third direction, and a bottom wall away from the convex hull, wherein, along the first direction, the size of the opening is smaller than the size of the bottom wall.

[0013] Optionally, the battery cell further includes a conductive layer connected between the first connecting portion and the second connecting portion.

[0014] Optionally, the battery pack further includes a housing and a cold plate, with the terminals facing the cold plate, the electrical connectors connecting the battery cells and the cold plate, and the cold plate being fixedly connected to the housing.

[0015] Optionally, the housing includes multiple side panels, which are sequentially connected along the circumference of the battery pack and enclose the cold plate to form a receiving cavity for accommodating the battery cells. The cold plate is fitted and connected to the side panels and is located at the bottom of the housing.

[0016] Optionally, at least two of the oppositely arranged side plates are provided with wedge-shaped grooves on the side closer to the battery cell, and the edge of the cold plate is a wedge-shaped structure adapted to the wedge-shaped grooves.

[0017] Optionally, the cold plate includes a cold plate body and a first positioning structure. The cold plate body includes a first side and a second side disposed opposite to each other along the third direction. The first side is disposed close to the battery cell, and the first positioning structure is disposed on the first side. The electrical connector includes a connector body and a second positioning structure. The first positioning structure is disposed on the connector body and is disposed opposite to the second positioning structure along the third direction for positioning between the electrical connector and the cold plate.

[0018] Optionally, the first positioning structure is a positioning post protruding towards the battery cell, and the second positioning structure is a positioning hole adapted to the positioning post, with the positioning post passing through the positioning hole.

[0019] Optionally, the battery pack further includes an insulating element disposed between the electrical connector and the cold plate.

[0020] Optionally, the battery pack further includes a first thermal conductive element, and a plurality of isolation elements are spaced apart between the cold plate and the electrical connector. The plurality of isolation elements, the cold plate, and the electrical connector enclose a receiving groove, and the first thermal conductive element is accommodated in the receiving groove.

[0021] Optionally, the battery pack further includes a second thermal conductive element disposed between the battery cell and the cold plate, and the second thermal conductive element is connected to at least one sidewall of the electrical connection along the second direction.

[0022] In this embodiment, a first connecting portion is provided on the cell terminal, and a second connecting portion is provided on the electrical connector. The second connecting portion can be fitted and connected with the first connecting portion to achieve electrical connection between two adjacent cells, thereby achieving the purpose of current transmission between cells. The battery pack provided in this embodiment achieves current transmission between the electrical connector and the cell through a fitted connection, avoiding the problem of incomplete soldering caused by welding between the electrical connector and the cell. The connection between the electrical connector and the cell is more stable and the process is simpler, improving the reliability and assembly efficiency of the battery pack.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is one of the assembly diagrams of the battery cell and electrical connector in the embodiments of this application;

[0026] Figure 2 This is the second assembly diagram of the battery cell and electrical connector in the embodiments of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the electrical connector in the embodiments of this application;

[0028] Figure 4 This is one of the partial schematic diagrams of the battery pack in the embodiments of this application;

[0029] Figure 5 This is a second partial schematic diagram of the battery pack in the embodiments of this application;

[0030] Figure 6 This is the third partial schematic diagram of the battery pack in the embodiments of this application;

[0031] Figure 7 This is the fourth partial schematic diagram of the battery pack in the embodiments of this application;

[0032] Figure 8 This is a schematic diagram of the assembly of the housing and the cold plate in an embodiment of this application.

[0033] Reference numerals: 10 - battery cell, 11 - battery cell body, 12 - electrode post, 121 - first connection part, 20 - electrical connector, 21 - connector body, 22 - second connection part, 23 - second positioning structure, 231 - positioning hole, 30 - cold plate, 31 - cold plate body, 311 - wedge structure, 32 - first positioning structure, 321 - positioning post, 40 - housing, 41 - side plate, 411 - wedge groove, 42 - receiving cavity, 50 - first heat conduction element, 51 - isolation element, 52 - receiving groove, 60 - second heat conduction element, 70 - convex bulge, 80 - groove, 90 - insulating element, x - first direction, y - second direction, z - third direction. Detailed Implementation

[0034] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering. For example, "parallel" refers to the angle between two lines, a line and a surface, or a surface, where the angle is between -1° and 1°. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. For example, "perpendicular" refers to the angle between two lines, a line and a surface, or a surface, where the angle is between 89° and 91°. Equal distances or equal angles include not only absolute equality but also approximate equality as commonly understood in engineering, meaning there may be a certain degree of error, such as a tolerance range of -1% to 1%.

[0039] With the development of new energy technologies, power batteries, as the power source for new energy electrical equipment, are being used more and more widely. However, the cost, yield rate, and space utilization of power batteries have always been important factors restricting the development of new energy technologies. Power batteries typically consist of multiple cells that need to be connected to transmit current. Currently, the common practice is to weld multiple cells together using metal connecting pieces. However, due to limitations in the connecting piece structure and welding process, the welding process is prone to incomplete welds, increasing battery safety risks. The cumbersome welding process also increases the manufacturing cost of power batteries. Furthermore, common friction stir welding methods or screw connections with sealing rings occupy a significant amount of the battery pack's height, reducing the Z-axis space utilization rate and hindering further increases in battery capacity.

[0040] Based on the above problems, this application provides a battery pack to at least solve the problem of poor soldering that easily occurs during the welding of connecting pieces.

[0041] The battery pack provided in the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The battery pack disclosed in the embodiments of this application has a first direction x, a second direction y, and a third direction z that intersect each other. Preferably, the first direction x, the second direction y, and the third direction z are perpendicular to each other.

[0042] like Figures 1 to 8As shown, the battery pack disclosed in this application may include: a plurality of battery cells 10, which are arranged along a first direction x and / or a second direction y, and a terminal post 12 is provided on one side of the battery cell 10 along a third direction z, and a first connecting portion 121 is provided on the terminal post 12; an electrical connector 20, which is connected between two adjacent battery cells 10, and the electrical connector 20 is provided with a second connecting portion 22, which is fitted and connected with the first connecting portion 121 to realize the electrical connection between two adjacent battery cells 10, so as to achieve the purpose of current transmission between battery cells 10. Since the electrical connection between adjacent battery cells 10 can be realized in the case of fitting and connection, the welding process can be eliminated, the assembly process between battery cells 10 can be simplified, and the connection reliability between the electrical connector 20 and the terminal post can be improved, thereby improving the service life and safety of the battery pack.

[0043] Specifically, such as Figure 1 , Figure 2 The battery pack shown has multiple cells 10 arranged along a first direction x and a second direction y. Each cell 10 has two terminals 12 on one side along a third direction z. The two terminals 12 are connected to two different electrical connectors 20. Adjacent cells 10 are connected through electrical connectors 20. One electrical connector 20 has two second connection parts 22. Multiple electrical connectors 20 connect multiple cells 10 in series or in parallel.

[0044] Understandably, since the first connecting part 121 on the terminal post 12 of the battery cell 10 and the second connecting part 22 on the electrical connector 20 are interlocked, the electrical connection between two adjacent battery cells 10 can be realized, avoiding the problem of false welding caused by welding between the electrical connector 20 and the battery cell 10. The connection between the electrical connector 20 and the battery cell 10 is more stable and the process is simpler, which improves the reliability and assembly efficiency of the battery pack and also helps to reduce production costs.

[0045] Optionally, the first connecting part 121 is one of the convex 70 and the groove 80, and the second connecting part 22 is the other of the convex 70 and the groove 80. The convex 70 and the groove 80 are fitted together to realize the electrical connection between two adjacent battery cells 10, which simplifies the structure of the battery cell 10 and the electrical connector 20.

[0046] Among them, the protrusion 70 and the groove 80 of the electrical connector 20 can be fitted together by interference fit. The size of the protrusion 70 can be slightly larger than the groove opening of the groove 80, so as to ensure the connection strength of the fitting connection between the protrusion 70 and the groove 80.

[0047] In some embodiments, the terminal post 12 of the battery cell 10 protrudes from the battery cell body 11. When the first connecting part 121 is a protrusion 70, the terminal post 12 can be used as the first connecting part 121. At the same time, the electrical connector 20 is provided with a groove 80, and the shape and size of the groove 80 are adapted to the terminal post 12 of the battery cell 10, thereby realizing the electrical connection between the battery cell 10 and the electrical connector 20.

[0048] Specifically, such as Figure 4 and Figure 5 As shown, the battery cell 10 includes a battery cell body 11 and a terminal post 12. The terminal post 12 protrudes from the battery cell body 11 along a third direction z. The first connecting portion 121 is a groove 80, which is disposed on the terminal post 12 and recessed towards the battery cell body 11. Figure 3 As shown, the electrical connector 20 includes a connector body 21 and a second connecting portion 22, which is a protrusion 70. The protrusion 70 protrudes from the connector body 21 and is at least partially embedded in the groove 80.

[0049] In this embodiment, the contact area between the electrical connector 20 and the pole post 12 is S1, the area of ​​the conventional connecting piece welded is S2, r1 is the outer radius of the welding ring, r2 is the inner radius of the welding ring, and S2 = π(r1 - r2). 2 Since the welding area of ​​S2 needs to take into account the structural characteristics of the terminal 12 of the battery cell 10, the welding area is limited. However, since S1 is more compatible with the shape of the terminal 12, the protrusion 70 can have a larger contact area with the terminal 12 of the battery cell 10 when using the electrical connector 20 provided in this application.

[0050] Specifically, the connector body 21 is provided with two protrusions 70, which are spaced apart along the first direction x. The protrusions 70 are integrally stamped from the electrical connector body 20, and their surfaces can be smooth or wrinkled to increase the contact area with the electrode post 12 of the battery cell 10. The protrusions 70 can be elongated, elliptical, or other shapes, without limitation. Figure 3 As shown in the embodiment of this application, the orthographic projection of the convex 70 in the first direction x is a semi-circle, and the orthographic projection in the second direction y is a rectangle. Along the first direction x, the size of the convex 70 is larger than the size of the groove 80 to ensure the interlocking connection strength between the two. This convex 70 structure has an arc-shaped top, which makes it easier to assemble into the groove 80 and improves assembly efficiency.

[0051] like Figure 1 , Figure 2As shown, the distance between the two protrusions 70 along the first direction x is greater than or equal to the distance between the terminals 12 of two adjacent cells 10, so as to ensure the connection between the first connection portion 121 on the terminal 12 of the adjacent cells 10 and the two protrusions 70 on the electrical connector 20. In this embodiment, the distance between the two protrusions 70 is equal to the distance between the terminals 12 of two adjacent cells 10, ensuring that the distance between two adjacent cells 10 along the first direction x is the minimum value, that is, the two adjacent cells 10 are tightly fitted together, ensuring the space utilization rate of the battery pack along the first direction x.

[0052] Furthermore, the groove 80 along the third direction z has an opening toward the bulge 70 and a bottom wall away from the bulge 70, wherein the size of the opening is smaller than the size of the bottom wall along the first direction x.

[0053] Since the groove 80 and the convex 70 are interlocked, without any external structure to reinforce the connection between them, the size of the opening is set to be smaller than the size of the bottom wall. After the convex 70 is embedded in the groove 80, the convex 70 is restricted by the size of the opening, which can prevent the convex 70 of the electrical connector 20 from coming out of the groove 80 on the electrode post 12 of the battery cell 10, thereby ensuring the connection strength and reliability between the two.

[0054] Optionally, the battery cell 10 further includes a conductive layer connected between the first connecting portion 121 and the second connecting portion 22 to enhance the conductivity between the first connecting portion 121 and the second connecting portion 22.

[0055] In specific applications, the conductive layer is a conductive adhesive, which can be a conductive paint made of various conductive particles, and is coated on the surface of the groove 80 or the protrusion 70. Due to manufacturing process limitations, the first connecting part 121 and the second connecting part 22 may not be completely bonded. Setting the thickness of the conductive layer allows it to fill the gap between the first connecting part 121 and the second connecting part 22, ensuring the reliability of the electrical connection between the terminal post 12 and the electrical connector 20. It should be noted that the conductive layer, as an additional conductive medium, ensures a tighter contact and smoother conductivity between the first connecting part 121 and the second connecting part 22, effectively avoiding battery pack performance degradation or failure due to poor contact. In addition, since the conductive layer usually has good conductivity, it can significantly reduce the resistance between the cell 10 and the electrical connector 20, ensuring the charging and discharging efficiency of the battery pack.

[0056] like Figure 7As shown in the embodiment of this application, the battery pack also includes a housing 40 and a cold plate 30. The terminal post 12 is disposed facing the cold plate 30. The electrical connector 20 is connected between the cell 10 and the cold plate 30. The cold plate 30 is fixedly connected to the housing 40, so that the cold plate 30 can press the electrical connector 20 tightly onto the terminal post 12 of the cell 10, thereby improving the connection strength. In addition, this position design of the cold plate 30 eliminates the existing connecting plate tray, reduces the overall weight of the battery pack, and also saves tray costs.

[0057] Specifically, the terminal post 12 of the battery cell 10 is positioned towards the bottom of the battery pack, and the cold plate 30 is located at the bottom of the battery pack. Since the electrical connector 20 is positioned between the cold plate 30 and the battery cell 10, compared to the traditional battery pack structure where the terminal post 12 of the battery cell 10 is positioned towards the top of the battery pack, the connecting piece needs to be positioned on the connecting piece tray and correspondingly positioned on the top of the battery pack. In the battery pack provided in this embodiment, the cold plate 30 can not only realize the heat dissipation function of the battery pack, but also be used as a tray for the electrical connector 20, thereby eliminating the existing connecting piece tray structure. This not only reduces the weight of the battery pack, i.e., the height in the third direction z, but also saves the cost of the connecting piece tray.

[0058] Optionally, the housing 40 includes a plurality of side plates 41, which are connected sequentially along the circumference of the battery pack and enclosed with the cold plate 30 to form a receiving cavity 42 for accommodating the battery cell 10. The cold plate 30 is fitted and connected to the side plates 41, and the cold plate 30 is located at the bottom of the housing 40.

[0059] Specifically, the housing 40 includes four side plates 41, and the cold plate 30 can be used as the bottom plate of the battery pack housing 40, on which the battery cells 10 are mounted. The battery cells 10 can be cooled by the cold plate 30. It should be noted that the common connection method between the bottom plate and the side plates 41 in the housing 40 is friction stir welding or bolt connection + sealing ring connection. In this embodiment, the cold plate 30 is fitted to the side plates 41, which can avoid welding connection and reduce the occurrence of poor welding. When the cold plate 30 and the side plates 41 are fitted together, the size of the battery pack housing 40 along the third direction z can also be reduced, and the space utilization rate in the third direction z can be improved.

[0060] Optionally, at least two oppositely arranged side plates 41 are provided with wedge-shaped grooves 411 on the side near the cell 10, and the edge of the cold plate 30 is a wedge-shaped structure 311 adapted to the wedge-shaped grooves 411 to realize the interlocking connection between the side plates 41 and the cold plate 30.

[0061] In practical applications, the embedding depth can be determined according to the thickness of the side plate 41 and the structural strength requirements of the battery pack. The embedding depth can be 5mm-50mm, and this application does not make a specific limitation on it. In addition, the width of the wedge groove 411 provided on the side plate 41 in the third direction z is slightly larger than the maximum thickness of the cold plate 30, thereby improving the friction between the two and ensuring the structural stability of the cold plate 30. The width of the wedge groove 411 can be 3mm-10mm.

[0062] Optionally, the cold plate 30 includes a cold plate body 31 and a first positioning structure 32. The cold plate body 31 includes a first side and a second side disposed opposite to each other along a third direction z. The first side is disposed close to the battery cell 10, and the first positioning structure 32 is disposed on the first side. The electrical connector 20 includes a connector body 21 and a second positioning structure 23. The first positioning structure 32 is disposed on the connector body 21 and is disposed opposite to the second positioning structure 23 along a third direction z, for positioning between the electrical connector 20 and the cold plate 30.

[0063] The cold plate 30 can be a strip-shaped cold plate 30 or an integrated cold plate 30. Compared with conventional pre-tightening force schemes, the force in the middle of the battery pack is greater, and the gap between the cells 10 in this area is also smaller, resulting in uneven gaps between the cells 10 in the battery pack. In this application, by setting a first positioning structure 32 on the cold plate body 31 and cooperating with a second positioning structure 23 on the electrical connector 20, the positioning between the electrical connector 20 and the cold plate 30 can be realized, ensuring the accurate positioning of the electrical connector 20, indirectly ensuring the design gap of the cells 10, and improving product quality and stability.

[0064] In addition, due to the design of the positioning structure, the positioning of the electrical connector 20 is more accurate, which can better ensure the design gap of the battery cell 10, thereby making the battery cell 10 subjected to uniform force.

[0065] In the embodiments of this application, such as Figure 5 As shown, the first positioning structure 32 is a positioning post 321 protruding towards the battery cell 10, and the second positioning structure 23 is a positioning hole 231 adapted to the positioning post 321. The positioning post 321 passes through the positioning hole 231. In practical applications, the size of the positioning hole 231 can be slightly larger than the positioning post 321 to balance positioning accuracy and assembly efficiency. In addition, the cooperation between the positioning post 321 and the positioning hole 231 can also enhance the connection stability between the electrical connector 20 and the cold plate 30, effectively preventing loosening or displacement that may occur during battery pack assembly or use, thereby ensuring the overall stability and reliability of the internal structure of the battery pack.

[0066] Optionally, the battery pack also includes an insulating element 90, which is disposed between the electrical connector 20 and the cold plate 30 to provide insulation protection between the cold plate 30 and the electrical connector 20 and ensure electrical safety.

[0067] In some embodiments, the battery pack further includes a first heat-conducting element 50, which is disposed between the cold plate 30 and the electrical connector 20.

[0068] In practical applications, a first heat-conducting component 50 can be added to the top cover area of ​​the battery cell 10 according to the heat dissipation requirements of the battery cell 10, so as to meet the heat dissipation requirements of the higher rate battery cell 10. The first heat-conducting component 50 can be a heat-conducting pad or a heat-conducting adhesive. The thickness of the heat-conducting pad needs to be greater than the distance between the cold plate 30 and the electrical connector 20. The heat-conducting adhesive can be bonded to both the cold plate 30 and the electrical connector 20 at the same time to ensure the heat conduction effect.

[0069] In this embodiment, the first thermally conductive component 50 is thermally conductive adhesive, and a plurality of isolation components 51 are provided at intervals between the cold plate 30 and the electrical connector 20. The plurality of isolation components 51, the cold plate 30 and the electrical connector 20 enclose and form a receiving groove 52, in which the first thermally conductive component 50 is received.

[0070] It should be noted that when the first heat-conducting component 50 is a heat-conducting adhesive, since the heat-conducting adhesive has a certain fluidity before curing, a limiting structure needs to be set. By setting multiple isolation components 51 to form a receiving groove 52, it can be used to contain the heat-conducting adhesive, prevent the heat-conducting adhesive from overflowing, and ensure that the heat-conducting adhesive is in the preset position.

[0071] The thermally conductive adhesive is applied between the insulating component 90 and the electrical connector 20. Assuming the area of ​​the conductive adhesive coating on a single electrical connector 20 is S1, and the peel strength of the conductive adhesive is σ, the tensile force of the conductive adhesive on the battery cell 10 is S1*σ. Typically, σ = 5 N / mm², and S1 ≥ 1000 mm², so the tensile force = 50 N, approximately 5 kg, which far exceeds the weight of the existing battery cell 10, thus ensuring the connection strength between the thermally conductive adhesive and the battery cell 10.

[0072] Optionally, such as Figure 8 As shown, the battery pack also includes a second heat-conducting element 60, which is disposed between the battery cell 10 and the cold plate 30 and is connected to at least one sidewall of the electrical connector 20 along the second direction y. More specifically, the second heat-conducting element 60 is connected to two sidewalls of the electrical connector 20 along the second direction y to enhance the heat dissipation effect of the battery cell 10.

[0073] In other embodiments, a second heat-conducting element 60 is disposed around and connected to the electrical connector 20, thereby increasing the heat exchange area between the pole 12 and the cold plate 30 and improving the efficiency of heat exchange.

[0074] Specifically, the second heat-conducting element 60 is disposed between the cell body 11 and the cold plate 30. The second heat-conducting element 60 can be a heat-conducting pad or a heat-conducting adhesive. When the second heat-conducting element 60 is a heat-conducting pad, the thickness of the heat-conducting pad needs to be greater than the distance between the cold plate 30 and the cell body 11. When the second heat-conducting element 60 is a heat-conducting adhesive, the heat-conducting adhesive needs to be bonded to both the cold plate 30 and the electrical connector 20 to ensure the heat conduction effect and further improve the heat dissipation capacity of the cell 10.

[0075] In summary, the battery pack provided in this application embodiment has at least the following advantages:

[0076] In this embodiment, a first connecting portion is provided on the cell terminal, and a second connecting portion is provided on the electrical connector. The second connecting portion can be fitted and connected with the first connecting portion to achieve electrical connection between two adjacent cells, thereby achieving the purpose of current transmission between cells. The battery pack provided in this embodiment achieves current transmission between the electrical connector and the cell through a fitted connection, avoiding the problem of incomplete soldering caused by welding between the electrical connector and the cell. The connection between the electrical connector and the cell is more stable and the process is simpler, improving the reliability and assembly efficiency of the battery pack.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack comprising a first direction (x), a second direction (y), and a third direction (z) intersecting each other, characterized in that, The battery pack includes: Multiple battery cells (10) are arranged along the first direction (x) and / or the second direction (y). Each battery cell (10) has a terminal post (12) on one side along the third direction (z). A first connection portion (121) is provided on the terminal post (12). An electrical connector (20) is connected between two adjacent battery cells (10). The electrical connector (20) is provided with a second connection part (22), which is fitted and connected to the first connection part (121) to realize the electrical connection between the two adjacent battery cells (10).

2. The battery pack according to claim 1, characterized in that, The first connecting part (121) is one of the convex hull (70) and the groove (80), and the second connecting part (22) is the other of the convex hull (70) and the groove (80). The convex hull (70) and the groove (80) are fitted together to realize the electrical connection between two adjacent cells (10).

3. The battery pack according to claim 2, characterized in that, The battery cell (10) includes a battery cell body (11) and a terminal post (12). The terminal post (12) protrudes from the battery cell body (11) along the third direction (z). The first connecting part (121) is the groove (80). The groove (80) is disposed on the terminal post (12) and recessed towards the battery cell body (11). The electrical connector (20) includes a connector body (21) and a protrusion (70), the protrusion (70) forming the second connection portion (22), the protrusion (70) protruding from the connector body (21), and the protrusion (70) being at least partially embedded in the groove (80).

4. The battery pack according to claim 2, characterized in that, The groove (80) along the third direction (z) has an opening toward the convex hull (70) and a bottom wall away from the convex hull (70), wherein, along the first direction (x), the size of the opening is smaller than the size of the bottom wall.

5. The battery pack according to claim 1, characterized in that, The battery cell (10) further includes a conductive layer, which is connected between the first connecting portion (121) and the second connecting portion (22).

6. The battery pack according to claim 1, characterized in that, The battery pack also includes a housing (40) and a cold plate (30), the terminal post (12) is disposed facing the cold plate (30), the electrical connector (20) is connected between the terminal post (12) and the cold plate (30), and the cold plate (30) is fixedly connected to the housing (40).

7. The battery pack according to claim 6, characterized in that, The housing (40) includes a plurality of side plates (41), which are connected circumferentially along the battery pack and enclose the cold plate (30) to form a receiving cavity (42) for accommodating the battery cell (10). The cold plate (30) is fitted and connected to the side plates (41) and is located at the bottom of the housing (40).

8. The battery pack according to claim 7, characterized in that, At least two of the side plates (41) arranged opposite each other are provided with wedge-shaped grooves (411) on the side near the cell (10), and the edge of the cold plate (30) is a wedge-shaped structure (311) adapted to the wedge-shaped grooves (411).

9. The battery pack according to claim 6, characterized in that, The cold plate (30) includes a cold plate body (31) and a first positioning structure (32). The cold plate body (31) includes a first side and a second side disposed opposite to each other along the third direction (z). The first side is disposed close to the battery cell (10), and the first positioning structure (32) is disposed on the first side. The electrical connector (20) includes a connector body (21) and a second positioning structure (23). The first positioning structure (32) is disposed on the connector body (21) and is disposed opposite to the second positioning structure (23) along the third direction (z) for positioning between the electrical connector (20) and the cold plate (30).

10. The battery pack according to claim 9, characterized in that, The first positioning structure (32) is a positioning post (321) protruding towards the battery cell (10), and the second positioning structure (23) is a positioning hole (231) adapted to the positioning post (321), with the positioning post (321) passing through the positioning hole (231).

11. The battery pack according to claim 6, characterized in that, The battery pack also includes a first heat-conducting component (50), and a plurality of isolation components (51) are spaced apart between the cold plate (30) and the electrical connector (20). The plurality of isolation components (51), the cold plate (30) and the electrical connector (20) enclose to form a receiving groove (52), and the first heat-conducting component (50) is accommodated in the receiving groove (52).

12. The battery pack according to claim 6, characterized in that, The battery pack further includes a second heat-conducting element (60), which is disposed between the battery cell (10) and the cold plate (30), and the second heat-conducting element (60) connects the electrical connector (20) to at least one sidewall along the second direction (y) and / or the first direction (x).

Images