Battery pack and electric device

Abstract

The application relates to the technical field of batteries, in particular to a battery pack and a power utilization device. The battery pack has a first direction and comprises: a battery cell, the battery cell has a first side wall and a pole, the pole is located at the first side wall and extends along the first direction; a busbar, the busbar is arranged along the first direction with the battery cell, the busbar comprises a first plane and a protrusion, the first plane is in contact with the end face of the pole, and the protrusion extends along the first direction and is in contact with the first side wall. The setting of the protrusion increases the point of contact between the busbar and the battery cell, which is beneficial to guarantee the stability of the busbar during welding and the position accuracy of the busbar in the first direction, can effectively overcome the problem of local poor contact between the busbar and the pole caused by uneven surface and uneven thickness of the busbar, and further prevent virtual welding between the busbar and the pole. This is beneficial to guarantee good current transmission efficiency between the battery cells, so as to guarantee good conductivity of the whole battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] In existing battery packs, cells are connected in series via busbars. The busbars are typically fixed and connected to the cell terminals by welding. Therefore, the reliability of the busbar-terminal welding directly affects the battery pack's conductivity, safety, and lifespan. Existing busbars are prone to quality defects such as insufficient flatness and uneven thickness. These defects affect the stability and positional accuracy of the busbar welding process, and can easily lead to poor contact between the busbar and the terminals, resulting in incomplete soldering. This affects the current transmission efficiency between cells, and consequently, the overall conductivity of the battery pack. Utility Model Content

[0003] To address the aforementioned problems, this application provides a battery pack and an electrical device.

[0004] In a first aspect, embodiments of this application provide a battery pack having a first orientation, comprising:

[0005] A battery cell having a first sidewall and a terminal post, the terminal post being located at the first sidewall and extending along a first direction;

[0006] A busbar is provided along the first direction with the battery cell. The busbar includes a first plane and a protrusion. The first plane contacts the end face of the electrode post, and the protrusion extends along the first direction and contacts the first sidewall.

[0007] Optionally, the protrusion is disposed on the first plane, and along the first direction, the vertical dimension of the protrusion is equal to the axial dimension of the pole post.

[0008] Optionally, the busbar is an integral structure formed from a sheet metal, and the protrusion is a partially stamped convex structure formed from the sheet metal.

[0009] Optionally, the battery pack includes a sampling structure; the protrusion includes a receiving cavity, the sampling structure is disposed within the receiving cavity and fixedly connected to the busbar.

[0010] Optionally, the sampling structure includes a temperature sampling terminal and a voltage sampling terminal, the bus includes two protrusions, the temperature sampling terminal is disposed in the receiving cavity of one of the protrusions, and the voltage sampling terminal is disposed in the receiving cavity of the other protrusion.

[0011] Optionally, both protrusions are located on the same edge portion of the busbar and are spaced apart from each other.

[0012] Optionally, the busbar includes a first through hole, and the pole has a first groove. The first through hole and the first groove are disposed opposite to each other along the first direction. The axial direction of the first through hole and the axial direction of the first groove are both parallel to the first direction. The radial dimension of the first through hole is D1, and the radial dimension of the first groove is D2, where D1 ≥ D2.

[0013] Optionally, the busbar includes a second groove, the first through hole and the second groove are disposed opposite to each other along the first direction, and the second groove is located on the side of the first through hole facing away from the first groove; the axial direction of the second groove is parallel to the first direction, and the radial dimension of the second groove is D3, where D3 > D1.

[0014] Optionally, the busbar includes a first structure and two second structures, wherein the first plane and the protrusion are both disposed at the first structure;

[0015] The second structure is connected between the two first structures, and the second structure is an arched structure formed by bending the plate.

[0016] Secondly, embodiments of this application provide an electrical device, which includes any of the battery packs described in the first aspect.

[0017] In some implementations of this application, the battery pack includes a battery cell and a busbar. The battery cell has a first sidewall and a terminal post, with the terminal post located at the first sidewall and extending along a first direction. The busbar and the battery cell are arranged along the first direction, with the first plane of the busbar contacting the end face of the terminal post, and a protrusion of the busbar extending along the first direction and contacting the first sidewall. The protrusion increases the number of contact points between the busbar and the battery cell, which helps ensure the stability of the busbar during welding and the positional accuracy of the busbar in the first direction. This effectively overcomes the problem of poor local contact between the busbar and the terminal post caused by factors such as uneven surface and uneven thickness of the busbar, thereby preventing cold solder joints between the busbar and the terminal post. Using the above structure helps ensure the welding quality and reliability between the terminal post and the busbar, thereby ensuring good current transmission efficiency between the battery cells and ensuring that the battery pack as a whole has good conductivity. Attached Figure Description

[0018] 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:

[0019] Figure 1 Axonometric views of a battery pack provided in some embodiments of this application;

[0020] Figure 2Exploded views of a battery pack provided in some embodiments of this application;

[0021] Figure 3 Cross-sectional schematic diagrams of the busbar and battery cell in some embodiments of this application;

[0022] Figure 4 for Figure 1 A frontal view of the battery pack from the negative X-direction;

[0023] Figure 5 These are isometric views of the bus provided in some embodiments of this application;

[0024] Figure 6 yes Figure 5 Front view of the central busbar from the negative X direction;

[0025] Reference numerals: 1. Battery cell; 11. First sidewall; 12. Terminal post; 121. First groove; 2. Busbar; 2a. First structure; 2b. Second structure; 21. First plane; 22. Protrusion; 221. Receiving cavity; 23. First through hole; 24. Second groove; 3. Sampling structure; 31. Temperature sampling terminal; 32. Voltage sampling terminal; X - First direction. Detailed Implementation

[0026] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown 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 utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0027] Existing battery packs typically contain multiple cells. For two adjacent cells, a busbar is usually used to connect the positive terminal of one cell to the negative terminal of the other; that is, the terminals of two adjacent cells are connected through the busbar. With the busbar connected, the cells in the battery pack are connected in series as a whole for charging and discharging operations.

[0028] Busbars and battery cell terminals are typically fixed and connected by welding. Therefore, the reliability of the busbar-terminal welding directly affects the battery pack's conductivity, safety, and lifespan. Existing busbars are prone to quality defects such as insufficient flatness and uneven thickness. These defects affect the stability and positional accuracy of the busbar welding process, easily reducing the contact area between the busbar and the terminal. In this case, contact between the busbar and the terminal occurs only at a few irregularly distributed points, rather than the entire welded surface as ideally desired. During welding, the contact areas between the busbar and the terminal may be effectively welded, while non-contact areas are prone to poor contact, leading to incomplete welds. Incomplete welds increase the contact resistance at the weld interface between the busbar and the terminal, thus affecting the current transmission efficiency between the cells. This increases the internal resistance of the battery pack, causing uneven heating, reduced power, and shortened lifespan; in severe cases, it can even lead to safety hazards such as thermal runaway.

[0029] To address the aforementioned issues, this application provides a battery pack and an electrical device.

[0030] refer to Figure 1 In a first aspect, embodiments of this application provide a battery pack having a first direction X, including a battery cell 1 and a busbar 2.

[0031] refer to Figure 2 Cell 1 is the smallest energy storage unit within the battery pack. Typically, a battery pack contains multiple cells 1 connected in series via a busbar 2. Cell 1 has a first sidewall 11 and a terminal post 12, with the terminal post 12 located at the first sidewall 11 and extending along a first direction X. In the embodiments described in this application, cell 1 can specifically be a cubic structure, meaning the outer casing of cell 1 is cubic, and the first sidewall 11 can specifically be a portion of the outer casing of cell 1 on one side. Cell 1 can also be a cylindrical structure, meaning the outer casing of cell 1 is cylindrical, and the first sidewall 11 can specifically be a portion of the outer casing of cell 1 located on one axial side. The terminal post 12 is the conductive structure of cell 1 used for connecting with other cells 1 or charging / discharging devices. In this application, the terminal post 12 is located at the first sidewall 11, meaning the first sidewall 11 is the portion of the outer casing of cell 1 where the terminal post 12 is located.

[0032] refer to Figure 3Busbar 2 is a structure used to connect the terminals 12 of two battery cells 1, or to connect the terminals 12 of battery cells 1 with other electrical components. Typically, busbar 2 is made of a metal with good conductivity, such as copper or aluminum. During soldering, busbar 2 and battery cells 1 are positioned along a first direction X. In the embodiments described in this application, the first direction X can be specifically determined according to actual needs. For example, the first direction X can be parallel to the direction of gravity, or the first direction X can be parallel to a horizontal direction. Busbar 2 includes a first plane 21 and a protrusion 22 extending along the first direction X. Since both the protrusion 22 and the terminals 12 extend along the first direction X, when busbar 2 and battery cells 1 are positioned along the first direction X, the first plane 21 can contact the end face of the terminal 12 along the first direction X, and the end of the protrusion 22 can contact the first sidewall 11 along the first direction X.

[0033] In traditional welding methods, busbar 2 and the terminal 12 of cell 1 contact each other along the first direction X. At this point, there is only one contact point between busbar 2 and cell 1. If busbar 2 has quality defects such as insufficient flatness or uneven thickness, the contact between the terminal 12 and busbar 2 alone cannot guarantee the stability and positional accuracy of the busbar 2 during welding, and therefore cannot guarantee complete contact between busbar 2 and terminal 12. During welding, the contact area between busbar 2 and terminal 12 may be effectively welded, while the non-contact areas are prone to poor contact, leading to incomplete welds between busbar 2 and terminal 12. The protrusion 22 increases the contact points between the busbar 2 and the cell 1, which helps ensure the stability of the busbar 2 during welding and the positional accuracy of the busbar 2 in the first direction X. This overcomes the problem of poor local contact between the busbar 2 and the terminal post 12 caused by factors such as uneven surface and thickness of the busbar 2, and ultimately prevents the problem of cold solder joints between the busbar 2 and the terminal post 12. In other words, the above structure helps to ensure the welding quality and reliability between the terminal post 12 and the busbar 2 when welding them, thereby ensuring good current transmission efficiency between the cells 1 and ensuring that the battery pack as a whole has good conductivity.

[0034] refer to Figure 3In some embodiments of this application, the protrusion 22 is optionally disposed on the first plane 21. Along the first direction X, the vertical dimension of the protrusion 22 is equal to the axial dimension of the electrode post 12. The vertical dimension of the protrusion 22 is the distance from the end of the protrusion 22 away from the first plane 21 along the first direction X to the first plane 21. The axial dimension of the electrode post 12 is the distance from the end of the electrode post 12 near the busbar 2 along the first direction X to the first sidewall 11. When the protrusion 22 is located on the first plane 21, making the vertical dimension of the protrusion 22 along the first direction X equal to the axial dimension of the electrode post 12 helps to ensure that the distance between the first plane 21 and the first sidewall 11 remains consistent, thus ensuring the positional accuracy and stability of the busbar 2 relative to the electrode post 12 of the cell 1 in the first direction X. When busbar 2 has quality defects such as insufficient flatness or uneven thickness, this ensures stable contact between busbar 2 and terminal post 12, preventing the problem of poor soldering between busbar 2 and terminal post 12. Setting the protrusion 22 on the first plane 21 also helps to control the dimensional accuracy of the protrusion 22 in the first direction X with the first plane 21 as a reference. This helps to ensure the fitting accuracy between busbar 2 and cell 1 and the positional accuracy of busbar 2 relative to terminal post 12.

[0035] refer to Figure 4 In some embodiments of this application, the busbar 2 may optionally be a one-piece structure formed from a sheet metal. In this case, the protrusion 22 is a convex structure formed by stamping a portion of the sheet metal. The convex structure is a structure formed by the portion of the sheet metal bulging in the stamping direction after being stamped by a mold. The embodiments described in this application utilize a sheet metal to form the busbar 2 integrally and utilize a stamping process to form the protrusion 22. This simplifies the processing of the busbar 2 and also helps ensure the structural strength of the busbar 2. In the later stages of battery pack use, the busbar 2 is less likely to tear due to the bulging of the battery cells 1.

[0036] refer to Figure 2In some embodiments of this application, the battery pack optionally includes a sampling structure 3. The sampling structure 3 described in this application embodiment can be used to collect the voltage on the busbar 2, or it can be used to collect the temperature on the busbar 2. The protrusion 22 includes a receiving cavity 221. In this application embodiment, the protrusion 22 is formed by stamping. A portion of the plate protrudes during stamping, and the protruding portion, together with other parts of the plate, forms a cavity, which is the receiving cavity 221 of the protrusion 22. The sampling structure 3 is disposed within the receiving cavity 221 and fixedly connected to the busbar 2. The receiving cavity 221 provides an accurate installation position for the sampling structure 3. When multiple busbars 2 are used to connect multiple battery cells 1, the sampling structure 3 can maintain the same positional relationship with each busbar 2. This ensures the consistency of the positional relationship between the sampling structure 3 and the busbar 2, preventing large positional offsets between the sampling structure 3 and the busbar 2 during installation, thus ensuring the consistency of the sampling results of the sampling structure 3 for each busbar 2. Based on the consistency of sampling structure 3, the battery pack can be more easily analyzed for consistency in temperature, voltage, etc.

[0037] refer to Figure 2 In some embodiments of this application, the sampling structure 3 optionally includes a temperature sampling terminal 31 and a voltage sampling terminal 32. Correspondingly, the busbar 2 includes two protrusions 22. The temperature sampling terminal 31 is disposed in the receiving cavity 221 of one of the protrusions 22, and the voltage sampling terminal 32 is disposed in the receiving cavity 221 of the other protrusion 22. This ensures the accuracy of the installation position of the temperature sampling terminal 31 and the voltage sampling terminal 32 on the busbar 2, which is beneficial to ensuring the consistency of the voltage sampling results and temperature sampling results of each busbar 2. In addition, the busbar 2 includes two protrusions 22, which increases the number of contact points between the busbar 2 and the cell 1. This can further ensure the stability of the busbar 2 during welding and the positional accuracy of the busbar 2 in the first direction X, and ultimately prevent the problem of poor welding between the busbar 2 and the terminal 12 as much as possible, that is, ensure the welding quality and welding reliability between the terminal 12 and the busbar 2 as much as possible. This can further ensure good current transmission efficiency between the cells 1, so that the battery pack as a whole has good conductivity.

[0038] refer to Figure 5In some embodiments of this application, optionally, both protrusions 22 are located on the same edge of the busbar 2, and the two protrusions 22 are spaced apart from each other. This facilitates the processing of the protrusions 22 and also facilitates the installation of the temperature sampling terminal 31 and the voltage sampling terminal 32. After the temperature sampling terminal 31 and the voltage sampling terminal 32 are respectively installed in the receiving cavity 221 of one protrusion 22, the spaced protrusions 22 can also reduce the mutual influence between the temperature sampling terminal 31 and the voltage sampling terminal 32, so as to ensure the accuracy of the sampling results of the temperature sampling terminal 31 and the voltage sampling terminal 32.

[0039] refer to Figure 4 In some embodiments of this application, optionally, the busbar 2 includes a first through hole 23, and the pole post 12 has a first groove 121. The first through hole 23 and the first groove 121 are disposed opposite to each other along the first direction X. The axial direction of the first through hole 23 and the axial direction of the first groove 121 are both parallel to the first direction X. The radial dimension D1 of the first through hole 23 is not less than the radial dimension D2 of the first groove 121, that is, D1≥D2. After the busbar 2 and the pole post 12 are combined along the first direction X, since the first through hole 23 and the first groove 121 are disposed opposite to each other along the first direction X, and the radial dimension D1 of the first through hole 23 is not less than the radial dimension D2 of the first groove 121, the projection of the first groove 121 in the first direction X will not exceed the projection of the first through hole 23 in the first direction X. This allows the first groove 121 to be used to determine the relative position of the busbar 2 and the pole post 12. If the projection of the first groove 121 in the first direction X exceeds the projection of the first through hole 23 in the first direction X, it indicates that the relative positions of the busbar 2 and the pole post 12 are not aligned, meaning the busbar 2 is not in the preset welding position. When the projection of the first groove 121 in the first direction X remains within the projection of the first through hole 23 in the first direction X, it indicates that the relative positions of the busbar 2 and the pole post 12 are aligned, and the busbar 2 is in the preset welding position.

[0040] Preferably, the cross-sections of the first groove 121 and the first through hole 23 in the first direction X are circular, and when the busbar 2 is in the preset welding position, the axes of the first groove 121 and the first through hole 23 coincide. The radial dimensions D1 of the first through hole 23 and D2 of the first groove 121 can be set according to actual needs. For example, the radial dimension D1 of the first through hole 23 can be 20mm, and the radial dimension D2 of the first groove 121 can be 15.6mm.

[0041] refer to Figure 6In some embodiments of this application, optionally, the busbar 2 includes a second groove 24, with the first through hole 23 and the second groove 24 disposed opposite to each other along a first direction X, and the second groove 24 located on the side of the first through hole 23 facing away from the first groove 121. The axial direction of the second groove 24 is parallel to the first direction X, and the radial dimension D3 of the second groove 24 is greater than the radial dimension D1 of the first through hole 23, i.e., D3 > D1. During welding, the solder mainly fills the first through hole 23 and the first groove 121, and the second groove 24 is located on the side of the first through hole 23 facing away from the first groove 121 to provide a physical reference for the welding range. In other words, when the busbar 2 is welded to the electrode post 12, the welding range should be smaller than the projected range of the second groove 24 in the first direction X. This facilitates the control of the welding range and prevents the welding from exceeding the preset range and damaging the casing of the battery cell 1.

[0042] Preferably, the cross-section of the second groove 24 in the first direction X is also circular. The axes of the second groove 24 and the first through hole 23 coincide, that is, the projections of the second groove 24 and the first through hole 23 in the first direction X are two concentric circles. The radial dimension D3 of the second groove 24 can be set according to actual needs; for example, the radial dimension D3 of the second groove 24 can be 60mm.

[0043] refer to Figure 6 In some embodiments of this application, the bus 2 may optionally include a first structure 2a and two second structures 2b.

[0044] The first structure 2a can specifically be the part of the sheet metal that remains straight after bending. The side of the first structure 2a facing the pole post 12 is the aforementioned first plane 21. The side of the first structure 2a facing the pole post 12 has a protrusion 22, which can specifically be a convex structure formed by stamping a portion of the first structure 2a.

[0045] The second structure 2b can be an arched structure formed by bending a sheet metal. There are two first structures 2a, and the second structure 2b connects the two first structures 2a. In the later stages of battery pack use, the cells 1 are prone to bulging due to long-term cycling. At this time, the distance between two adjacent cells 1 will increase. The second structure 2b can then undergo adaptive deformation to prevent the busbar 2 from being torn due to the bulging of the cells 1.

[0046] Specifically, in the embodiments described in this application, the battery pack may be provided with multiple battery cells 1 and multiple busbars 2. The number of battery cells 1 and the number of busbars 2 in the battery pack can be set according to actual needs. For ease of understanding, this application embodiment takes a battery pack with six battery cells 1 as an example to further illustrate the battery pack structure.

[0047] The battery pack has six cells 1, which are arranged in the same direction. The busbar 2 has a first plane 21 and a protrusion 22. The first plane 21 of the busbar 2 is in contact with the terminal post 12 of the cell 1, and the protrusion 22 of the busbar 2 is in contact with the first sidewall 11 of the cell 1.

[0048] For the two outermost battery cells 1, the busbar 2 at the positive terminal of one battery cell 1 has only one first through hole 23 and one second groove 24, and the busbar 2 at the negative terminal of the other battery cell 1 also has only one first through hole 23 and one second groove 24. The busbar 2 is used to enable the battery cell 1 to supply power to the outside, and therefore is only soldered to the terminal 12 of one battery cell 1. For the terminals 12 of the remaining battery cells 1, in two adjacent battery cells 1, the same busbar 2 connects the positive terminal of one battery cell 1 and the negative terminal of the other battery cell 1, that is, the busbar 2 is simultaneously connected to different types of terminals 12 on two battery cells 1.

[0049] For the busbar 2 connecting different battery cells 1, the busbar 2 has two first parts and a second part connected between the two first parts. The busbar 2 is specifically a one-piece structure processed from a sheet metal. The first part is the part of the sheet metal that remains flat after forming, and the second part is an arched structure formed by bending the sheet metal. At the edge of each of the two first structures 2a, a protrusion 22 is formed by stamping, and the two protrusions 22 are arranged at intervals relative to each other. The battery pack is also provided with a sampling structure 3. One of the two protrusions 22 is used to set the voltage sampling terminal 32 of the sampling structure 3, and the other is used to set the temperature sampling terminal 31 of the sampling structure 3.

[0050] Secondly, embodiments of this application provide an electrical device. The electrical device described in this application includes any of the battery packs described in the first aspect. Specifically, the electrical device may be a new energy vehicle, an energy storage cabinet, a large electronic device, etc., which will not be listed in detail here.

[0051] refer to Figure 1 Specifically, the battery pack has a first direction X and includes a cell 1 and a bus 2.

[0052] refer to Figure 2Cell 1 is the smallest energy storage unit within the battery pack. Typically, a battery pack contains multiple cells 1 connected in series via a busbar 2. Cell 1 has a first sidewall 11 and a terminal post 12, with the terminal post 12 located at the first sidewall 11 and extending along a first direction X. In the embodiments described in this application, cell 1 can specifically be a cubic structure, meaning the outer casing of cell 1 is cubic, and the first sidewall 11 can specifically be a portion of the outer casing of cell 1 on one side. Cell 1 can also be a cylindrical structure, meaning the outer casing of cell 1 is cylindrical, and the first sidewall 11 can specifically be a portion of the outer casing of cell 1 located on one axial side. The terminal post 12 is the conductive structure of cell 1 used for connecting with other cells 1 or charging / discharging devices. In this application, the terminal post 12 is located at the first sidewall 11, meaning the first sidewall 11 is the portion of the outer casing of cell 1 where the terminal post 12 is located.

[0053] refer to Figure 3 Busbar 2 is a structure used to connect the terminals 12 of two battery cells 1, or to connect the terminals 12 of battery cells 1 with other electrical components. Typically, busbar 2 is made of a metal with good conductivity, such as copper or aluminum. During soldering, busbar 2 and battery cells 1 are positioned along a first direction X. In the embodiments described in this application, the first direction X can be specifically determined according to actual needs. For example, the first direction X can be parallel to the direction of gravity, or the first direction X can be parallel to a horizontal direction. Busbar 2 includes a first plane 21 and a protrusion 22 extending along the first direction X. Since both the protrusion 22 and the terminals 12 extend along the first direction X, when busbar 2 and battery cells 1 are positioned along the first direction X, the first plane 21 can contact the end face of the terminal 12 along the first direction X, and the end of the protrusion 22 can contact the first sidewall 11 along the first direction X.

[0054] In traditional welding methods, busbar 2 and the terminal 12 of cell 1 contact each other along the first direction X. At this point, there is only one contact point between busbar 2 and cell 1. If busbar 2 has quality defects such as insufficient flatness or uneven thickness, the contact between the terminal 12 and busbar 2 alone cannot guarantee the stability and positional accuracy of the busbar 2 during welding, and therefore cannot guarantee complete contact between busbar 2 and terminal 12. During welding, the contact area between busbar 2 and terminal 12 may be effectively welded, while the non-contact areas are prone to poor contact, leading to incomplete welds between busbar 2 and terminal 12. The protrusion 22 increases the contact points between the busbar 2 and the cell 1, which helps ensure the stability of the busbar 2 during welding and the positional accuracy of the busbar 2 in the first direction X. This overcomes the problem of poor local contact between the busbar 2 and the terminal post 12 caused by factors such as uneven surface and thickness of the busbar 2, and ultimately prevents the problem of cold solder joints between the busbar 2 and the terminal post 12. In other words, the above structure helps to ensure the welding quality and reliability between the terminal post 12 and the busbar 2 when welding them, thereby ensuring good current transmission efficiency between the cells 1 and ensuring good conductivity of the battery pack as a whole. This helps to reduce the internal resistance of the battery pack and prevent problems such as uneven heating, power reduction, and shortened lifespan. Therefore, using the aforementioned battery pack helps to ensure the working performance and service life of electrical equipment.

[0055] refer to Figure 3 In some embodiments of this application, the protrusion 22 is optionally disposed on the first plane 21. Along the first direction X, the vertical dimension of the protrusion 22 is equal to the axial dimension of the electrode post 12. The vertical dimension of the protrusion 22 is the distance from the end of the protrusion 22 away from the first plane 21 along the first direction X to the first plane 21. The axial dimension of the electrode post 12 is the distance from the end of the electrode post 12 near the busbar 2 along the first direction X to the first sidewall 11. When the protrusion 22 is located on the first plane 21, making the vertical dimension of the protrusion 22 along the first direction X equal to the axial dimension of the electrode post 12 helps to ensure that the distance between the first plane 21 and the first sidewall 11 remains consistent, thus ensuring the positional accuracy and stability of the busbar 2 relative to the electrode post 12 of the cell 1 in the first direction X. When busbar 2 has quality defects such as insufficient flatness or uneven thickness, this ensures stable contact between busbar 2 and terminal post 12, preventing the problem of poor soldering between busbar 2 and terminal post 12. Setting the protrusion 22 on the first plane 21 also helps to control the dimensional accuracy of the protrusion 22 in the first direction X with the first plane 21 as a reference. This helps to ensure the fitting accuracy between busbar 2 and cell 1 and the positional accuracy of busbar 2 relative to terminal post 12.

[0056] refer to Figure 4In some embodiments of this application, the busbar 2 may optionally be a one-piece structure formed from a sheet metal. In this case, the protrusion 22 is a convex structure formed by stamping a portion of the sheet metal. The convex structure is a structure formed by the portion of the sheet metal bulging in the stamping direction after being stamped by a mold. The embodiments described in this application utilize a sheet metal to form the busbar 2 integrally and utilize a stamping process to form the protrusion 22. This simplifies the processing of the busbar 2 and also helps ensure the structural strength of the busbar 2. In the later stages of battery pack use, the busbar 2 is less likely to tear due to the bulging of the battery cells 1.

[0057] refer to Figure 2 In some embodiments of this application, the battery pack optionally includes a sampling structure 3. The sampling structure 3 described in this application embodiment can be used to collect the voltage on the busbar 2, or it can be used to collect the temperature on the busbar 2. The protrusion 22 includes a receiving cavity 221. In this application embodiment, the protrusion 22 is formed by stamping. A portion of the plate protrudes during stamping, and the protruding portion, together with other parts of the plate, forms a cavity, which is the receiving cavity 221 of the protrusion 22. The sampling structure 3 is disposed within the receiving cavity 221 and fixedly connected to the busbar 2. The receiving cavity 221 provides an accurate installation position for the sampling structure 3. When multiple busbars 2 are used to connect multiple battery cells 1, the sampling structure 3 can maintain the same positional relationship with each busbar 2. This ensures the consistency of the positional relationship between the sampling structure 3 and the busbar 2, preventing large positional offsets between the sampling structure 3 and the busbar 2 during installation, thus ensuring the consistency of the sampling results of the sampling structure 3 for each busbar 2. Based on the consistency of sampling structure 3, the battery pack can be more easily analyzed for consistency in temperature, voltage, etc.

[0058] refer to Figure 2 In some embodiments of this application, the sampling structure 3 optionally includes a temperature sampling terminal 31 and a voltage sampling terminal 32. Correspondingly, the busbar 2 includes two protrusions 22. The temperature sampling terminal 31 is disposed in the receiving cavity 221 of one of the protrusions 22, and the voltage sampling terminal 32 is disposed in the receiving cavity 221 of the other protrusion 22. This ensures the accuracy of the installation position of the temperature sampling terminal 31 and the voltage sampling terminal 32 on the busbar 2, which is beneficial to ensuring the consistency of the voltage sampling results and temperature sampling results of each busbar 2. In addition, the busbar 2 includes two protrusions 22, which increases the number of contact points between the busbar 2 and the cell 1. This can further ensure the stability of the busbar 2 during welding and the positional accuracy of the busbar 2 in the first direction X, and ultimately prevent the problem of poor welding between the busbar 2 and the terminal 12 as much as possible, that is, ensure the welding quality and welding reliability between the terminal 12 and the busbar 2 as much as possible. This can further ensure good current transmission efficiency between the cells 1, so that the battery pack as a whole has good conductivity.

[0059] refer to Figure 5 In some embodiments of this application, optionally, both protrusions 22 are located on the same edge of the busbar 2, and the two protrusions 22 are spaced apart from each other. This facilitates the processing of the protrusions 22 and also facilitates the installation of the temperature sampling terminal 31 and the voltage sampling terminal 32. After the temperature sampling terminal 31 and the voltage sampling terminal 32 are respectively installed in the receiving cavity 221 of one protrusion 22, the spaced protrusions 22 can also reduce the mutual influence between the temperature sampling terminal 31 and the voltage sampling terminal 32, so as to ensure the accuracy of the sampling results of the temperature sampling terminal 31 and the voltage sampling terminal 32.

[0060] refer to Figure 4 In some embodiments of this application, optionally, the busbar 2 includes a first through hole 23, and the pole post 12 has a first groove 121. The first through hole 23 and the first groove 121 are disposed opposite to each other along the first direction X. The axial direction of the first through hole 23 and the axial direction of the first groove 121 are both parallel to the first direction X. The radial dimension D1 of the first through hole 23 is not less than the radial dimension D2 of the first groove 121, that is, D1≥D2. After the busbar 2 and the pole post 12 are combined along the first direction X, since the first through hole 23 and the first groove 121 are disposed opposite to each other along the first direction X, and the radial dimension D1 of the first through hole 23 is not less than the radial dimension D2 of the first groove 121, the projection of the first groove 121 in the first direction X will not exceed the projection of the first through hole 23 in the first direction X. This allows the first groove 121 to be used to determine the relative position of the busbar 2 and the pole post 12. If the projection of the first groove 121 in the first direction X exceeds the projection of the first through hole 23 in the first direction X, it indicates that the relative positions of the busbar 2 and the pole post 12 are not aligned, meaning the busbar 2 is not in the preset welding position. When the projection of the first groove 121 in the first direction X remains within the projection of the first through hole 23 in the first direction X, it indicates that the relative positions of the busbar 2 and the pole post 12 are aligned, and the busbar 2 is in the preset welding position.

[0061] Preferably, the cross-sections of the first groove 121 and the first through hole 23 in the first direction X are circular, and when the busbar 2 is in the preset welding position, the axes of the first groove 121 and the first through hole 23 coincide. The radial dimensions D1 of the first through hole 23 and D2 of the first groove 121 can be set according to actual needs. For example, the radial dimension D1 of the first through hole 23 can be 20mm, and the radial dimension D2 of the first groove 121 can be 15.6mm.

[0062] refer to Figure 6In some embodiments of this application, optionally, the busbar 2 includes a second groove 24, with the first through hole 23 and the second groove 24 disposed opposite to each other along a first direction X, and the second groove 24 located on the side of the first through hole 23 facing away from the first groove 121. The axial direction of the second groove 24 is parallel to the first direction X, and the radial dimension D3 of the second groove 24 is greater than the radial dimension D1 of the first through hole 23, i.e., D3 > D1. During welding, the solder mainly fills the first through hole 23 and the first groove 121, and the second groove 24 is located on the side of the first through hole 23 facing away from the first groove 121 to provide a physical reference for the welding range. In other words, when the busbar 2 is welded to the electrode post 12, the welding range should be smaller than the projected range of the second groove 24 in the first direction X. This facilitates the control of the welding range and prevents the welding from exceeding the preset range and damaging the casing of the battery cell 1.

[0063] Preferably, the cross-section of the second groove 24 in the first direction X is also circular. The axes of the second groove 24 and the first through hole 23 coincide, that is, the projections of the second groove 24 and the first through hole 23 in the first direction X are two concentric circles. The radial dimension D3 of the second groove 24 can be set according to actual needs; for example, the radial dimension D3 of the second groove 24 can be 60mm.

[0064] refer to Figure 6 In some embodiments of this application, the bus 2 may optionally include a first structure 2a and two second structures 2b.

[0065] The first structure 2a can specifically be the part of the sheet metal that remains straight after bending. The side of the first structure 2a facing the pole post 12 is the aforementioned first plane 21. The side of the first structure 2a facing the pole post 12 has a protrusion 22, which can specifically be a convex structure formed by stamping a portion of the first structure 2a.

[0066] The second structure 2b can be an arched structure formed by bending a sheet metal. There are two first structures 2a, and the second structure 2b connects the two first structures 2a. In the later stages of battery pack use, the cells 1 are prone to bulging due to long-term cycling. At this time, the distance between two adjacent cells 1 will increase. The second structure 2b can then undergo adaptive deformation to prevent the busbar 2 from being torn due to the bulging of the cells 1.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0068] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0070] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0071] 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 the present invention. 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 at least two embodiments or examples.

[0072] Although embodiments of the present invention 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 the present invention.

Claims

1. A battery pack, characterized in that, The battery pack has a first orientation (X) and includes: A battery cell (1) having a first sidewall (11) and a terminal (12), the terminal (12) being located at the first sidewall (11) and extending along the first direction (X); Busbar (2), the busbar (2) and the battery cell (1) are arranged along the first direction (X), the busbar (2) includes a first plane (21) and a protrusion (22), the first plane (21) is in contact with the end face of the pole (12), and the protrusion (22) extends along the first direction (X) and is in contact with the first sidewall (11).

2. The battery pack according to claim 1, characterized in that, The protrusion (22) is disposed on the first plane (21) along the first direction (X), and the vertical dimension of the protrusion (22) is equal to the axial dimension of the pole post (12).

3. The battery pack according to claim 1, characterized in that, The busbar (2) is an integral structure formed by plate forming, and the protrusion (22) is a convex structure formed by partial stamping of the plate.

4. The battery pack according to claim 3, characterized in that, The battery pack includes a sampling structure (3); the protrusion (22) includes a receiving cavity (221), the sampling structure (3) is disposed in the receiving cavity (221) and fixedly connected to the busbar (2).

5. The battery pack according to claim 4, characterized in that, The sampling structure (3) includes a temperature sampling terminal (31) and a voltage sampling terminal (32). The bus (2) includes two protrusions (22). The temperature sampling terminal (31) is disposed in the receiving cavity (221) of one of the protrusions (22), and the voltage sampling terminal (32) is disposed in the receiving cavity (221) of the other protrusion (22).

6. The battery pack according to claim 5, characterized in that, Both protrusions (22) are located on the same edge portion of the busbar (2) and are spaced apart from each other.

7. The battery pack according to any one of claims 1-6, characterized in that, The busbar (2) includes a first through hole (23), and the pole post (12) has a first groove (121). The first through hole (23) and the first groove (121) are arranged opposite to each other along the first direction (X). The axial direction of the first through hole (23) and the axial direction of the first groove (121) are both parallel to the first direction (X). The radial dimension of the first through hole (23) is D1, and the radial dimension of the first groove (121) is D2, where D1 ≥ D2.

8. The battery pack according to claim 7, characterized in that, The busbar (2) includes a second groove (24), the first through hole (23) and the second groove (24) are disposed opposite to each other along the first direction (X), and the second groove (24) is located on the side of the first through hole (23) facing away from the first groove (121); the axial direction of the second groove (24) is parallel to the first direction (X), and the radial dimension of the second groove (24) is D3, D3>D1.

9. The battery pack according to claim 3, characterized in that, The busbar (2) includes a first structure (2a) and two second structures (2b), with the first plane (21) and the protrusion (22) both located at the first structure (2a); The second structure (2b) is connected between the two first structures (2a), and the second structure (2b) is an arched structure formed by bending the plate.

10. An electrical appliance, characterized in that, The electrical equipment includes the battery pack as described in any one of claims 1-9.

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