Battery module and battery pack

Abstract

The utility model belongs to the field of batteries, and discloses a battery module and a battery pack, the battery module comprises a battery cell stacking body, a busbar assembly, a sampling plate assembly and a connecting device, the busbar assembly comprises a first busbar and a second busbar which are respectively arranged at the two ends, provided with the battery cell tabs, of the battery cell stacking body; the sampling plate assembly is connected to the first busbar and is used for collecting the potential of the first busbar; the connecting device is connected with the sampling plate assembly, the connecting device is further connected with the second busbar, and the sampling plate assembly collects the potential of the second busbar through the connecting device. According to the utility model, the potential acquisition of the whole battery system can be completed only by arranging one sampling plate assembly, so that the sampling plate assembly on one side can be omitted, the use of materials is saved, the processing procedures of the system are reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] With the vigorous development of the new energy industry, the market demand for low-cost and high-safety battery systems is gradually increasing. It has become a trend to simplify the structure as much as possible, improve battery safety performance and reduce costs while ensuring that the battery function is not affected.

[0003] In order to collect voltage information during system operation, the battery system in the prior art usually requires a sampling board to collect this information. For a battery system with double-ended tab cells, since the tabs are on both sides, sampling boards are needed on both sides of the tabs to collect signals. Therefore, two corresponding sampling boards are needed to collect signals, which increases the number of system components used, the number of processes, and the cost. Utility Model Content

[0004] The main purpose of this application is to provide a battery module and a battery pack, aiming to solve the technical problem of too many existing sampling plates.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a battery module, including a battery cell stack, a busbar assembly, a sampling plate assembly and a connecting device;

[0006] The busbar assembly includes a first busbar and a second busbar, which are respectively arranged at two ends of the battery cell stack body provided with battery cell tabs;

[0007] The sampling plate assembly is connected to the first bus bar and is used to collect the potential of the first bus bar;

[0008] The connecting device is connected to the sampling plate assembly, and the connecting device is also connected to the second bus bar, and the sampling plate assembly collects the electric potential of the second bus bar through the connecting device.

[0009] Further, the connecting device comprises a first contact piece;

[0010] The first contact piece extends toward one end away from the sampling plate assembly to form an extension portion, and the extension portion is connected to the second bus bar;

[0011] A collection block is provided at one end of the first contact piece close to the sampling plate assembly, and the collection block is connected to the sampling plate assembly.

[0012] Furthermore, the extension portion of the first contact sheet includes a straight portion and a bent portion connected to the second bus bar, and the bent portion of the first contact sheet and the second bus bar are integrated by laser welding.

[0013] Furthermore, the connection between the straight portion and the bent portion of the extension portion is connected into an integral piece by a first arc-shaped connecting piece, and a non-enclosed gap is formed between the bent portion and the battery cell stack.

[0014] Further, at least one first through slot penetrating the first busbar is provided in the middle of the first busbar, and first supporting parts are provided on both sides of the first through slot parallel to the cell tabs, and the first busbar further comprises a first connecting end and a second connecting end, which are respectively vertically arranged at two ends of the first supporting part;

[0015] At least one second through slot penetrating the second busbar is provided in the middle portion of the second busbar, and second supporting portions are provided on both sides of the second through slot parallel to the battery cell pole ears. The second busbar also includes a third connecting end and a fourth connecting end, which are respectively vertically arranged at the two ends of the second supporting portion.

[0016] Further, the battery cell tab comprises a first battery cell tab welded to a first supporting portion of the first busbar by laser welding, and a second battery cell tab welded to a second supporting portion of the second busbar by laser welding;

[0017] The lengths of the first cell tab and the second cell tab are less than or equal to the lengths of the first support portion and the second support portion.

[0018] Furthermore, the sampling plate assembly includes a sampling plate body in spaced contact with the first bus, the sampling plate body is provided with a first conductive member connected to the collection block by laser welding, and a second conductive member connected to the first connection end of the first bus by laser welding.

[0019] Furthermore, the connecting device also includes a second contact piece opposite to the first contact piece, and a third contact piece connecting the first contact piece and the second contact piece, wherein the first contact piece, the second contact piece and the third contact piece form a U-shaped connecting piece.

[0020] Further, the third contact piece is connected to the first contact piece and the second contact piece through a second arc-shaped connecting piece to form an integral piece, and the first contact piece, the second contact piece and the third contact piece are clearance-fitted with the battery cell stack.

[0021] The utility model further provides a battery pack, comprising a battery management system and at least one battery module as described in any one of the above items, wherein the sampling plate assembly of each battery module is electrically connected to the battery management system.

[0022] Beneficial effects:

[0023] The utility model arranges a sampling plate assembly at one end of the first bus away from the battery cell stack to collect the electric potential of the first bus, and the sampling plate assembly collects the electric potential of the second bus by connecting with the connecting device. Therefore, only one sampling plate assembly is needed to complete the electric potential collection of the entire battery system, thus eliminating the sampling plate assembly on one side, saving on the use of materials, reducing system processing procedures, and lowering production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall schematic diagram of a battery module according to an embodiment of the present utility model;

[0025] Figure 2 This is a partial enlarged view of the battery module at position D of an embodiment of the utility model;

[0026] Figure 3 This is a partial enlarged view of the battery module at point E of an embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of a battery module and a first busbar according to an embodiment of the utility model;

[0028] Figure 5 This is a partial enlarged view of the battery module and the first busbar B of an embodiment of the utility model;

[0029] Figure 6 This is an overall schematic diagram of a connecting device according to an embodiment of the utility model;

[0030] Figure 7 This is a partial enlarged view of the entire A portion of the connecting device of one embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of a battery module and a second busbar in one embodiment of the utility model;

[0032] Fig. 9 This is a partial enlarged view of the battery module and the second busbar C of one embodiment of the utility model.

[0033] in:

[0034] 1-battery cell stack; 2-first bus; 3-second bus; 4-first contact piece; 5-second contact piece; 6-third contact piece; 7-extension portion; 8-collection block; 9-straight portion; 10-bending portion; 11 first arc-shaped connector; 12 second arc-shaped connector; 13 gap; 20-sampling plate assembly; 21-connecting device; 22-plastic bracket; 30-first through groove; 31-first supporting portion; 32-first connecting end; 33-second connecting end; 40-second through groove; 41-second supporting portion; 42-third connecting end; 44-fourth connecting end; 50-first battery cell pole ear; 51-second battery cell pole ear; 60-sampling plate body; 61-first conductive member; 62-second conductive member; 70-conductive sheet; 71-heat dissipation device.

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] Reference Figure 1-Figure 3 A battery module comprises a battery cell stack 1, a busbar assembly, a sampling plate assembly 20 and a connecting device 21; the busbar assembly comprises a first busbar 2 and a second busbar 3, which are respectively arranged at two ends of the battery cell stack 1 provided with battery cell tabs; the sampling plate assembly 20 is connected to the first busbar 2 for collecting the potential of the first busbar 2; the connecting device 21 is connected to the sampling plate assembly 20, and the connecting device 21 is also connected to the second busbar 3, and the sampling plate assembly 20 collects the potential of the second busbar 3 through the connecting device 21.

[0041] In the above embodiment, the battery module includes a cell stack 1, a bus assembly, a sampling plate assembly 20 and a connecting device 21, and the bus assembly includes a first bus 2 and a second bus 3, which are respectively arranged at the two ends of the cell stack 1 where the cell pole ears are provided. Multiple cells can be electrically connected together to form a series or parallel circuit structure, thereby achieving high voltage, high capacity or high discharge current output of the battery module. In addition, the first bus 2 and the second bus 3 can also serve as support members of the cell stack 1 to fix the installation position of the cell stack 1 to ensure that the cell stack 1 is not easily loosened under vibration or collision.Further, the sampling plate assembly 20 is connected to the first bus 2 to collect the potential of the first bus 2, wherein the connection method is preferably laser welding, which can achieve small welds and high-quality welding connections, improve the accuracy and reliability of the product, and the first bus 2 is located between the sampling plate assembly 20 and the battery stack 1, the first bus 2 and the sampling plate assembly 20 are parallel to each other, so that when the battery cell tabs of the battery cell stack 1 are laser welded to the first bus 2, the sampling plate assembly 20 and the first bus 2 are laser welded together to collect the potential of the battery cell tab end connected to the first bus 2, and the sampling plate The assembly 20 is also connected to the connecting device 21, and the connecting device 21 is also connected to the second bus 3, wherein the connection method is preferably connected by laser welding, which can achieve small welds and high-quality welding connections, and the connecting device 21 is a heat dissipation device 71 of the entire battery module, while maintaining the heat dissipation effect, it can also be used for the sampling plate assembly 20 to collect the electric potential of the battery cell stack 1 at one end of the second bus 3, the remaining parts of the heat dissipation device 71 are mainly used for heat dissipation of the battery cell stack 1, and each part of the heat dissipation device 71 corresponds to each battery cell of the battery cell stack 1, and further the connecting device 21 is located The first bus 2 and the second bus 3 are connected between the first bus 2 and the second bus 3, and are in contact with the battery stack 1, so that each connecting device 21 corresponds to each battery cell of the battery stack 1, which helps the connecting device 21 to effectively improve the heat dissipation of the battery stack 1 while maintaining conductivity. Further, the sampling plate assembly 20 collects the potential of the second bus 3 through the connecting device 21, so that the connecting device 21 is connected to the sampling plate assembly 20 at one end on the battery stack 1 and connected to the second bus 3 at the other end, so that the sampling plate assembly 20 can complete the potential collection of the second bus 3 through the connecting device 21, so that the battery cells of the battery stack 1 A sampling plate assembly 20 is provided at one end of the pole ear to complete the potential collection of the battery cell stack 1, thereby improving the space utilization rate of the entire battery system so as to grasp the health status of the battery cell stack 1 in real time. Therefore, compared with the battery cell stack 1 with double-ended pole ears, two sampling plate assemblies 20 are required to complete the voltage collection of the battery cell stack 1. In this embodiment, only one sampling plate assembly 20 is provided at one end of the pole ear ends on both sides of the battery cell stack 1 to complete the voltage collection of the battery cell stack 1. In this way, the sampling plate assembly 20 on one side can be omitted, the system processing steps are saved, and the use of materials is correspondingly reduced, thereby reducing the production cost.

[0042] When it is necessary to collect the voltage of the battery cell stack 1, the second bus 3 is connected to the sampling plate assembly 20 through the connecting device 21, so that the sampling plate assembly 20 collects the potential of the battery cell stack 1 at one end of the second bus 3 through the connecting device 21, wherein the potential of one end of the battery cell stack 1 obtained by the end where the connecting device 21 is connected to the second bus is the point B potential, so that the point B potential where the connecting device 21 is connected to the second bus can be obtained at the end where the connecting device 21 is connected to the sampling plate assembly 20, so that the sampling plate assembly 20 obtains the potential of one end of the battery cell stack 1, and further the sampling plate assembly 20 is connected to the first bus 2, The sampling plate assembly 20 can obtain the electric potential of one end of the battery cell stack 1 relative to the second bus 3 through the first bus 2, so that the electric potential of the other end of the battery cell stack 1 obtained by the end of the sampling plate assembly 20 connected to the first bus 2 is the point A potential. At this time, the sampling plate assembly 20 can obtain the electric potential of point A and point B at both ends of the entire battery cell stack 1, so that the voltage value to be measured can be obtained through the potential difference between point A and point B, so that only one sampling plate assembly 20 needs to be set on one side of the battery cell stack 1 to complete the voltage collection of the battery cell stack 1, thereby improving the space utilization of the system and reducing the use of system materials.

[0043] Reference Figure 1-Figure 9 In one embodiment, the connecting device 21 includes a first contact piece 4; and the first contact piece 4 extends toward an end away from the sampling plate assembly 20 to form an extension portion 7, and the extension portion 7 is connected to the second bus 3; the first contact piece 4 is provided with a collection block 8 at one end close to the sampling plate assembly 20, and the collection block 8 is connected to the sampling plate assembly 20.

[0044] In the above embodiment, the connecting device 21 includes a first contact piece 4, and the first contact piece 4 is arranged at one end of the battery cell stack 1 perpendicular to the battery cell stack 1 where the battery cell pole ear is arranged, so that the first contact piece 4 is arranged on the top of the battery cell stack 1, and the first contact piece 4 can also maintain heat dissipation on the top of the battery cell stack 1 during the process of transmitting the electric potential of the second bus 3, thereby improving the heat dissipation capacity of the battery cell stack 1, and the first contact piece 4 extends toward the end away from the sampling plate assembly 20 to form an extension portion 7, and the extension portion 7 is connected to the second bus 3 at the end of the battery cell stack 1, wherein the connection method is preferably laser welding, which can achieve small welds and high-quality welding connections, improve the accuracy and reliability of the product, and make the connection between the connecting device 21 and the second bus 3 more convenient, thereby improving the second The accuracy of the potential collection of the bus 3 is improved. The first contact piece 4 is further connected to the sampling plate assembly 20 through the collection block 8, and the connection method is preferably laser welding, which can achieve tiny welds and high-quality welding connections, improve the accuracy and reliability of the product, and make the sampling plate assembly 20 more firmly connected to the first contact piece 4, so as to avoid the sampling plate assembly 20 running for a long time and causing unstable connection with the first contact piece 4, so that the potential collected by the sampling plate assembly 20 is not accurate enough. Therefore, the point B potential obtained by the extension part 7 connecting to the second bus 3 is collected to the sampling plate assembly 20 through the collection block 8 connected to the first contact piece 4, so that the sampling plate assembly 20 can obtain the collection of the point B potential of the second bus 3, thereby improving the accuracy of the potential collected by the sampling plate assembly 20.

[0045] Reference Figure 1-Figure 9 In one embodiment, the extension portion 7 of the first contact sheet 4 includes a straight portion 9 and a bent portion 10 connected to the second bus bar 3, and the bent portion 10 of the first contact sheet 4 and the second bus bar 3 are integrated by laser welding.

[0046] In the above embodiment, the extension portion 7 of the first contact piece 4 includes a straight portion 9 and a bent portion 10 connected to the second bus 3, so that when the second bus 3 collects the potential at point B to the collection block 8, the potential at point B can effectively control the impedance of the line through the bending portion 10 with a reasonable bending design, thereby improving the stability and reliability of the potential. In addition, the bending portion 10 with a bending design can save space in the battery system, making the design of the connecting device 21 more compact. Furthermore, the bending portion 10 of the first contact sheet 4 is integrated with the second bus 3 by laser welding. In addition, a bending extension portion is provided at the end of the bending portion 10 for convenient welding with the second bus 3, which can reduce looseness and shaking at the welding point and improve the stability of the overall structure. In addition, during the welding process of the bending portion 10 and the second bus 3, due to the use of laser welding, the heat affected zone generated during welding is smaller, and the internal structure of the battery cell stack 1 is not stimulated. The deformation of the bending portion 10 is reduced, and the accuracy of the bending portion 10 in transmitting electric potential is improved. Correspondingly, due to the use of laser welding of the bending portion 10 and the second bus 3, a larger welding depth is achieved during welding, which improves the firmness of the bending portion 10 and the second bus 3.

[0047] Reference Figure 6-Figure 9 In one embodiment, the connection between the straight portion 9 and the bent portion 10 of the extension portion 7 is connected into an integral piece by a first arc-shaped connector 11 , and a non-enclosed gap 13 is formed between the bent portion 10 and the battery cell stack 1 .

[0048] In the above embodiment, the connection between the straight portion 9 and the bent portion 10 of the extension portion 7 is connected into an integral part through the first arc-shaped connector 11. The first arc-shaped connector 11 is an inner arc-shaped structure bent toward the battery cell stack 1, so that the inner arc-shaped first arc-shaped connector 11 can reduce the length of the potential line when collecting the potential, thereby reducing the loss of the potential during the collection process, which is conducive to maintaining the integrity of the potential. In addition, since the straight portion 9 and the bent portion 10 are connected into an integral part through the first arc-shaped connector 11, the situation of inaccurate data during potential collection due to connection failure is avoided, thereby improving the reliability and stability of the potential. Further, a non-enclosed gap 13 is formed between the bent portion 10 and the battery cell stack 1, so that the bent portion 10 will not touch other components, ensuring the accuracy during the potential collection process. Further, when welding the bent portion 10 and the second busbar 3, due to the gap of a certain space, the welding process is more convenient, and the assembly efficiency of the bent portion 10 is improved.

[0049] Reference Figure 1-Figure 9In one embodiment, at least one first through slot 30 penetrating the first bus bar 2 is provided in the middle of the first bus bar 2, and first supporting portions 31 are provided on both sides of the first through slot 30 parallel to the battery cell tabs. The first bus bar 2 also includes a first connecting end 32 and a second connecting end 33, which are respectively vertically arranged at the two ends of the first supporting portion 32.

[0050] In the above embodiment, at least one first through slot 30 penetrating the first bus bar 2 is provided in the middle of the first bus bar 2, and first support portions 31 are provided on both sides of the first through slot 30 parallel to the battery cell pole ears. The first support portions 31 can provide additional support and fixation to ensure that the battery cell pole ears are in a stable position in the first through slot 30, thereby reducing the possibility of movement and damage under vibration or impact, so that the battery cell pole ears of the battery cell stack 1 at one end of the first bus bar 2 can pass through the first through slot 30 and be connected to the first support portion 31, and the size of the first through slot 30 is larger than the size of the pole ears of the battery cell stack 1 at one end of the first bus bar 2, ensuring that the pole ears can completely pass through the first through slot 30 and be connected to the first support portion 31. In addition, by providing the first through slot 30 on the first bus bar 2, the weight of the battery system is effectively reduced, the bending strength and torsional stiffness of the first bus bar 2 are guaranteed, and the first support portions 31 on both sides of the first through slot 30 can reduce the stress concentration of the first bus bar 2, effectively avoiding the problem of fracture or deformation of the first bus bar due to stress concentration. Furthermore, the first bus 2 also includes a first connection end 32 and a second connection end 33, which are respectively vertically arranged at the two ends of the first support portion 32, so that the first bus 2 is convenient to position and match during the assembly process, which helps to improve the assembly accuracy and stability of the first bus 2, and the first connection end 32 and the second connection end 33 at the two ends of the first support portion 31 make the overall strength of the first bus 2 higher, thereby improving the service life of the first bus 2.

[0051] Further references Figure 5 and Figure 6 In one embodiment, at least one second through slot 40 penetrating the second bus bar 3 is provided in the middle of the second bus bar 3, and second support portions 41 are provided on both sides of the second through slot 40 parallel to the battery cell tabs, and the second bus bar 3 also includes a third connection end 42 and a fourth connection end 44, which are respectively vertically arranged at the two ends of the second support portion 41.

[0052] In the above embodiment, at least one second through slot 40 penetrating the second bus bar 3 is provided in the middle of the second bus bar 3, and second support portions 41 are provided on both sides of the second through slot 40 parallel to the battery cell pole ear. The second support portion 41 can provide additional support and fixation to ensure that the battery cell pole ear is stably positioned in the second through slot 40, thereby reducing the possibility of movement and damage under vibration or impact, so that the pole ear of the battery cell stack 1 located at one end of the second bus bar 3 can pass through the second through slot 40 and be connected to the second through slot 40, and the size of the second through slot 40 is larger than the size of the pole ear of the battery cell stack 1 located at one end of the second bus bar 3, ensuring that the pole ear can completely pass through the second through slot 40 and be connected to the second support portion 41. In addition, by arranging the second through slot 40 on the second bus bar 3, the weight of the battery system is effectively reduced, the bending strength and torsional stiffness of the second bus bar 3 are guaranteed, and the second support portions 41 on both sides of the second through slot 40 can reduce the stress concentration of the second bus bar 3, effectively avoiding the problem of breakage or deformation of the second bus bar 3 due to stress concentration. Furthermore, the second bus 3 also includes a third connection end 42 and a fourth connection end 44, which are respectively vertically arranged at the two ends of the second support portion 41, so that the second bus 3 is convenient to position and match during the assembly process, which helps to improve the assembly accuracy and stability of the second bus 3, and the third connection end 42 and the fourth connection end 44 at the two ends of the second support portion 41 make the overall strength of the second bus 3 higher, thereby improving the service life of the second bus 3. Furthermore, mutually symmetrical plastic brackets 22 are provided between the first bus 2 and the second bus 3 and the battery cell stack 1. On the one hand, the plastic bracket 22 can provide support for the battery cell stack 1 to ensure that the battery cell stack 1 maintains a stable position and arrangement, effectively preventing the battery cell stack 1 from loosening or misalignment. On the other hand, it also makes it more convenient to assemble the first bus 2 and the second bus 3, thereby improving the assembly efficiency.

[0053] Reference Figure 1-Figure 9 In one embodiment, the cell tabs include a first cell tab 50 welded on the first support portion 31 of the first busbar 2 by laser welding, and a second cell tab 51 welded on the second support portion 41 of the second busbar 3 by laser welding;

[0054] The lengths of the first cell tab 50 and the second cell tab 51 are less than or equal to the lengths of the first support portion 31 and the second support portion 41 .

[0055] In the above embodiment, the battery cell tabs at both ends of the battery cell stack 1 include: a first battery cell tab 50 welded on the first support portion 31 of the first bus 2 by laser welding, and a second battery cell tab 51 welded on the second support portion 41 of the second bus 3 by laser welding. The laser welding method is used to connect, which can achieve tiny welds and high-quality welding connections, improve the accuracy and reliability of the product, and thus form a battery system with double-ended tab batteries, so that the internal resistance of the battery cell stack 1 is effectively reduced, and the output efficiency and safety performance of the battery cell stack 1 are improved. Therefore, when the first When the cell tab 50 and the second cell tab 51 are connected to the first support portion 31 of the first bus 2 and the second support portion 41 of the second bus 3 respectively by laser welding, the first tab cell 50 is bent toward the first support portion 31 to form a first cell tab bent portion and a first cell tab straight portion, and the size of the first cell tab bent portion is the same as the size of the first support portion 31, so that the first tab cell 50 and the first bus 2 are more firmly connected. In addition, the bend between the first cell tab bent portion and the first cell tab straight portion is an arc, which effectively reduces the loss of potential during the transmission process. Further, the second cell tab 51 is bent toward the second support portion 41 to form a second cell tab bent portion and a second cell tab straight portion, and the size of the second cell tab bent portion is the same as the size of the second support portion 41, so that the second cell tab 51 and the second bus 3 are more firmly connected.

[0056] Furthermore, the length of the first battery cell pole lug 50 and the second battery cell pole lug 51 is less than or equal to the length of the first support portion 31 and the second support portion 41, ensuring that the length of the battery cell pole lug does not exceed the support portion can effectively prevent short circuits between the battery cell pole lugs. If the battery cell pole lugs are too long, contact between the battery cell pole lugs may result, thereby causing a short circuit and increasing safety risks. In addition, the first battery cell pole lug 50 of the battery cell stack 1 passes through the first through groove 30 of the first bus 2 and is connected to the first support portion 31 by laser welding. On the one hand, after passing through the first through groove 30, the first battery cell pole lug 50 is laser welded to the first support portion 31 to form a whole, so that a greater welding depth can be achieved during welding, thereby improving the firmness of the first battery cell pole lug 50 and the first support portion 31, and the first through groove 30 effectively avoids collisions between multiple first battery cell pole lugs 50, so that the potential from the first battery cell pole lug 50 to the first support portion 31 will not be disordered, thereby improving the accuracy of the potential. Furthermore, the second cell pole lug 51 of the cell stack 1 passes through the second through groove 40 of the second bus 3 and is connected to the second support portion 41. On the one hand, the second cell pole lug 51 is laser welded into one with the second support portion 41 after passing through the second through groove 40, so that a larger welding depth can be achieved during welding, thereby improving the firmness of the second cell pole lug 51 and the second support portion 41, and the second through groove 40 effectively avoids collisions between multiple second cell pole lugs 51, so that the potential from the second cell pole lug 51 to the second support portion 41 will not be disordered, thereby improving the accuracy of the potential.

[0057] Reference Figure 1-Figure 9 In one embodiment, the sampling plate assembly 20 includes a sampling plate body 60 that is in spaced contact with the first bus 2, and the sampling plate body 60 is provided with a first conductive member 61 connected to the collection block 8 by laser welding, and a second conductive member 62 connected to the first connection end 32 of the first bus 2 by laser welding.

[0058] In the above embodiment, the sampling plate assembly 20 includes a sampling plate body 60 in spaced contact with the first bus 2. By adopting a spaced contact design, electrical isolation can be effectively achieved to prevent short circuits between different first bus bars 2 and the sampling plate body 60, which helps to improve the safety and stability of the battery system. The sampling plate body 60 is provided with a first conductive member 61 connected to the collection block 8 at one end close to the first contact sheet 4, wherein the connection method adopts laser welding to connect the first conductive member 61 and the collection block 8, so that a small weld and high-quality welding connection can be achieved, thereby improving the accuracy and reliability of the product. The sampling plate body is mainly used to transmit the collected voltage value required to be measured obtained from the potential difference between point A and point B to the battery management system, so that the user can monitor the operating status of the battery cell stack 1 in real time, thereby improving The safety performance of the battery system is improved, and the size of the first conductive member 61 is smaller than that of the collection block 8, which effectively reduces the weight of the overall structure of the battery system. In addition, the first conductive member 61 has an arc structure at the bend when connecting the collection block 8 and the sampling plate body 60, which effectively reduces the loss of potential during the transmission process. Further, the sampling plate assembly 20 also includes a second conductive member 62 connected to the first connection end 32 of the first bus 2 by laser welding, wherein the connection method adopts laser welding to connect the second conductive member 62 and the first connection end 32, so that a small weld and high-quality welding connection can be achieved, thereby improving the accuracy and reliability of the product. The first bus 2 is closely connected to the second conductive member 62, which effectively reduces the impedance during the connection process and reduces the influence of resistance and inductance during the potential collection process.

[0059] Furthermore, a conductive sheet 70 is formed by extending from one end of the second conductive member 62 away from the sampling plate body 60. The conductive sheet 70 with a sheet-like structure increases the effective contact area with the first connecting end 32. On the one hand, the potential collected by the conductive sheet 70 is more accurate. On the other hand, the conductive sheet 70 and the first connecting end 32 of the first bus 2 are laser welded together, so that the connection between the conductive sheet 70 and the first connecting end 32 is more secure, thereby improving the stability of the potential during the long-term operation of the battery cell stack 1 and ensuring that the potential remains stable when the potential passes through the second conductive member 62 to the sampling plate body 60.

[0060] Reference Figure 1-Figure 9 In one embodiment, the connecting device 21 also includes a second contact piece 5 opposite to the first contact piece 4, and a third contact piece 6 connecting the first contact piece 4 and the second contact piece 5, wherein the first contact piece 4, the second contact piece 5 and the third contact piece 6 form a U-shaped connecting piece.

[0061] In the above embodiments, the connecting device 21 further includes a second contact piece 5 opposite to the first contact piece 4, and a third contact piece 6 connecting the first contact piece 4 and the second contact piece 5. A plurality of connecting devices 21 are provided in the battery cell stack 1, corresponding to each battery cell of the battery cell stack 1 respectively. The first contact piece 4, the second contact piece 5 and the third contact piece 6 enclose a C-shaped structure, and the C-shaped connecting device 21 is in contact with the battery cells of the battery cell stack 1 on three sides, so that the first contact piece 4, the second contact piece 5 and the third contact piece 6 with good thermal conductivity can effectively absorb the heat generated during the operation of the battery cells of the battery cell stack 1, improving the heat dissipation effect of the battery cell stack. On the other hand, all three sides of the entire connecting device have good electrical conductivity, enabling the sampling board assembly 20 to collect the potential at point B of the second busbar 3 through the first contact piece 4 located at the top of the battery cell stack 1. And since the first contact piece is located at the top of the battery cell stack 1, this helps facilitate the welding of the sampling board assembly 20 to the first contact piece 4 by the staff, improving the accuracy of potential collection and also the work efficiency.

[0062] Referring to Figure 1-Figure 9 , in one embodiment, the third contact piece 6 is connected to the first contact piece 4 and the second contact piece 5 by a second arc-shaped connecting piece 12 to form an integral part, and the first contact piece 4, the second contact piece 5 and the third contact piece 6 are in clearance fit with the battery cell stack 1.

[0063] In the above embodiments, the third contact piece 6 is connected to the first contact piece 4 and the second contact piece 5 by a second arc-shaped connecting piece 12 to form an integral part, reducing the connection between components, reducing the risk of failure caused by connection failure, and improving the reliability and stability of the potential at point B during the collection process. And by connecting the first contact piece 4, the second contact piece 5 and the third contact piece 6 into an integral part through the arc-shaped second arc-shaped connecting piece 12, the loss of potential during the transmission process is effectively reduced, ensuring the accuracy of the potential at point B during the collection process. Further, the first contact piece 4, the second contact piece 5 and the third contact piece 6 are in clearance fit with the battery cell stack 1, so that during the assembly process, an appropriate clearance can reduce the friction with the battery cell stack 1, making the assembly smoother and not damaging the battery cell stack 1.

[0064] The present utility model further provides a battery pack, which includes a battery management system and the battery module described in any of the above embodiments. The sampling board assembly 20 of each battery module is connected to the battery management system.

[0065] In the above embodiment, the battery pack includes a battery management system and a battery module, and the sampling plate assembly 20 of each of the battery modules is electrically connected to the battery management system, so that the user can monitor the battery module voltage data collected by the sampling plate assembly 20 in real time, thereby helping to improve the intelligent monitoring and analysis of the battery management system and improve the safety performance of the battery module.

[0066] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery module, characterized in that: It includes a battery cell stack, a busbar assembly, a sampling plate assembly and a connecting device; The busbar assembly includes a first busbar and a second busbar, which are respectively arranged at two ends of the battery cell stack body provided with battery cell tabs; The sampling plate assembly is connected to the first bus bar and is used to collect the potential of the first bus bar; The connecting device is connected to the sampling plate assembly, and the connecting device is also connected to the second bus bar, and the sampling plate assembly collects the electric potential of the second bus bar through the connecting device.

2. The battery module according to claim 1, characterized in that: The connecting device comprises a first contact piece; The first contact piece extends toward one end away from the sampling plate assembly to form an extension portion, and the extension portion is connected to the second bus bar; A collection block is provided at one end of the first contact piece close to the sampling plate assembly, and the collection block is connected to the sampling plate assembly.

3. The battery module according to claim 2, characterized in that: The extension portion of the first contact sheet includes a straight portion and a bent portion connected to the second bus bar, and the bent portion of the first contact sheet and the second bus bar are integrated by laser welding.

4. The battery module according to claim 3, characterized in that: The connection between the straight portion and the bent portion of the extension portion is connected into an integral piece through a first arc-shaped connecting piece, and a non-enclosed gap is formed between the bent portion and the battery cell stack.

5. The battery module according to claim 4, characterized in that: At least one first through slot penetrating the first busbar is provided in the middle of the first busbar, and first supporting parts are provided on both sides of the first through slot parallel to the cell tabs, and the first busbar further comprises a first connecting end and a second connecting end, which are respectively vertically arranged at two ends of the first supporting part; At least one second through slot penetrating the second busbar is provided in the middle portion of the second busbar, and second supporting portions are provided on both sides of the second through slot parallel to the battery cell pole ears. The second busbar also includes a third connecting end and a fourth connecting end, which are respectively vertically arranged at the two ends of the second supporting portion.

6. The battery module according to claim 5, characterized in that: The cell tabs include a first cell tab welded on a first support portion of the first busbar by laser welding, and a second cell tab welded on a second support portion of the second busbar by laser welding; The lengths of the first cell tab and the second cell tab are less than or equal to the lengths of the first support portion and the second support portion.

7. The battery module according to claim 5, characterized in that: The sampling plate assembly includes a sampling plate body that is in spaced contact with the first bus, and a first conductive member and a second conductive member are provided on the sampling plate body. The first conductive member is connected and fixed to the collection block by laser welding, and the second conductive member is connected and fixed to the first connecting end of the first bus by laser welding.

8. The battery module according to any one of claims 2 to 7, characterized in that: The connecting device further comprises a second contact piece opposite to the first contact piece, and a third contact piece connecting the first contact piece and the second contact piece, wherein the first contact piece, the second contact piece and the third contact piece form a U-shaped connecting piece.

9. The battery module according to claim 8, characterized in that: The third contact piece is connected to the first contact piece and the second contact piece through a second arc-shaped connecting piece to form an integral piece, and the first contact piece, the second contact piece and the third contact piece are clearance-fitted with the battery cell stack.

10. A battery pack, characterized in that: It comprises a battery management system and at least one battery module according to any one of claims 1 to 9, wherein the sampling plate assembly of each battery module is electrically connected to the battery management system.

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