Soft pack battery components and electrical equipment

Abstract

The present invention discloses a soft-pack battery assembly, including a connecting device and at least two soft-pack batteries. The connecting device includes a tab carrier, a crimping member, and a connecting member that respectively connects the tab carrier and the crimping member. The connecting member is used to press the crimping member to the tab carrier so that the tabs of two adjacent soft-pack batteries can be connected together through the connecting device. The present application connects the tabs of two adjacent soft-pack batteries by setting a connecting device, and only uses the connecting device of the present application to fix the two adjacent tabs. This non-welding connection method not only makes the production and operation process of the entire battery assembly simpler, facilitates assembly and disassembly and maintenance, reduces the welding process of traditional soft-pack battery assemblies, improves the production and assembly efficiency of soft-pack batteries and corporate benefits, but also can meet different series and parallel wiring methods of soft-pack battery assemblies, and improve the adaptability of soft-pack battery assemblies.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a soft-pack battery assembly and an electrical device. Background Art

[0002] In the related art, in the existing soft-pack battery assembly production process, the series and parallel connection of the soft-pack battery single-cell pole ears are generally connected by bolts, soldering or laser welding. Lithium batteries connected by bolts are prone to short circuits, and require a large number of bolts, which greatly increases the weight of the soft-pack battery assembly; soft-pack battery assemblies connected by welding are prone to heat deformation of the parts with lower melting points around the welded parts due to the high temperature generated during the welding process. Because they are fixed by welding, it is extremely inconvenient to disassemble and repair the soft-pack battery assembly; the use of soldering technology requires the use of high-power equipment such as tin furnaces, which wastes a lot of energy, and the production process is relatively cumbersome. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the series and parallel connection of the soft-pack battery monomer tabs in the existing soft-pack battery assembly is generally connected by bolts, soldering or laser welding, which increases the weight of the battery assembly, makes the process complicated and makes disassembly inconvenient.

[0004] In order to solve the above technical problems, the present invention provides a soft pack battery assembly, which comprises:

[0005] At least two soft-pack batteries arranged in sequence;

[0006] At least one connecting device, the connecting device comprising a tab carrier, a crimping member, and a connecting member connecting the tab carrier and the crimping member, the tab carrier being located at the same end of at least two tabs of the soft-pack battery, and the crimping member being located at a side of the tab carrier away from the soft-pack battery;

[0007] Parts of the tabs of two adjacent soft-pack batteries are bent toward each other and clamped and fixed between the tab carrier and the crimping member, so that the two adjacent soft-pack batteries are electrically connected.

[0008] In one embodiment of the present application, when the crimping member is in the initial position, the crimping member abuts against an end of the tab carrier away from the connecting member;

[0009] In the direction from the crimping piece to the tab carrier, there is an accommodation gap between the tab carrier and the crimping piece, and the distance of the accommodation gap gradually increases from the position where the crimping piece and the tab carrier abut against each other to the direction of the connecting piece, and the distance of the accommodation gap is M.

[0010] Wherein, M: 0≦M<2D, where D is the initial thickness of the soft-pack battery tab.

[0011] In one embodiment of the present application, the connecting member is an elastic connecting piece, which can make the crimping member close to the tab carrier so that the tabs of two adjacent soft-pack batteries are clamped and fixed between the crimping member and the tab carrier.

[0012] In an embodiment of the present application, the connecting piece includes a first lead-out section, an arc section, and a second lead-out section connected in sequence, the first lead-out section and the second lead-out section are arranged in parallel, the first lead-out section is connected to the crimping piece, and the second lead-out section is connected to the tab carrier;

[0013] The arc segment can drive the crimping component to approach the tab carrier through the first lead-out segment.

[0014] In an embodiment of the present application, the arc segment includes a first arc segment and a second arc segment, one end of the first arc segment is connected to the first lead-out segment, one end of the second arc segment is connected to the second lead-out segment, and the arc where the first arc segment is located is tangent to the arc where the second arc segment is located;

[0015] The center of the arc where the first arc segment is located is located on the side of the first lead-out segment away from the second lead-out segment, and the center of the arc where the second arc segment is located is located between the first lead-out segment and the second lead-out segment.

[0016] In one embodiment of the present application, when the crimping member is in the initial position, the radius of the arc where the first arc segment is located is R 1 , the center angle of the arc where the first arc segment is located is θ 1 , the radius of the arc where the second arc segment is located is R 2 , the center angle of the arc where the second arc segment is located is θ 2 ,

[0017] The central angle θ of the first arc segment 1 and the central angle θ of the second arc segment 2 The following relations are satisfied:

[0018] θ 2 -θ 1 =180°;

[0019] 180°<θ 2 <270°;

[0020] R 1 The following relations are satisfied:

[0021] R 1≥2t, where t is the thickness of the arc segment;

[0022] R 2 The following relations are satisfied:

[0023]

[0024] E is the elastic modulus of the arc segment material; ΔL is the compression deformation of the arc segment; A is the cross-sectional area of ​​the arc segment; F n A downward pressing force provided to the arc segment;

[0025] Among them, the F n The following relations are satisfied:

[0026]

[0027] R j is the contact resistance of the tab, and K is the contact constant of the contact material.

[0028] In one embodiment of the present application, the connecting member includes an upper clamping plate, a lower clamping plate, a rotating shaft and an elastic member, wherein the elastic member is located between the upper clamping plate and the lower clamping plate and is sleeved in the rotating shaft, and the upper clamping plate and the lower clamping plate can be rotatably connected via the rotating shaft;

[0029] The upper clamping plate is connected to the crimping piece, the lower clamping plate is connected to the tab carrier, one end of the elastic piece abuts against the upper clamping plate, and the other end abuts against the lower clamping plate, so that the crimping piece is driven to approach the tab carrier through the upper clamping plate, thereby enabling the crimping piece and the tab carrier to clamp and fix the tabs of two adjacent soft-pack batteries.

[0030] In one embodiment of the present application, the upper clamping plate has a first fixing portion and a first pressing portion in sequence, one end of the first fixing portion is connected to the crimping member, and the first pressing portion is bent in a direction away from the lower clamping plate;

[0031] The lower clamping plate is a horizontal plate, and the first fixing portion is arranged parallel to the lower clamping plate;

[0032] The elastic member has a first extending end and a second extending section, the first extending end abuts against the first rotating section of the upper clamping plate, and the second extending end abuts against the lower clamping plate.

[0033] In one embodiment of the present application, the tab carrier is provided with a first clamping member, and the crimping member is provided with a second clamping member. When the tabs of two adjacent soft-pack batteries are clamped and fixed between the tab carrier and the crimping member, the first clamping member is clamped and fixed with the second clamping member.

[0034] In one embodiment of the present application, the crimping member has a plurality of protrusions on one side facing the tab carrier, and when the tabs of two connected soft-pack batteries are clamped and fixed between the tab carrier and the crimping member, the protrusions abut against the tabs.

[0035] In one embodiment of the present application, the connecting device also includes baffles arranged on opposite sides of the tab carrier, the baffles extend toward the tab carrier, the baffles and the tab carrier together form a accommodating space, and a portion of the two soft-pack batteries electrically connected by the connecting device are located in the accommodating space.

[0036] In one embodiment of the present application, at least two of the soft-pack batteries are arranged in sequence along the thickness direction, and the two soft-pack batteries electrically connected by the connecting device are respectively a first battery and a second battery, the first battery and the second battery respectively have side surfaces opposite to each other along the thickness direction, the two side surfaces of the first battery and the second battery facing away from each other are bonded and fixed to the two baffles one by one, and there is an expansion gap between the opposite side surfaces of the first battery and the second battery.

[0037] In one embodiment of the present application, the crimping component, the connecting component and the tab carrier are integrally formed.

[0038] In one embodiment of the present application, the soft-pack battery assembly also has a busbar, and a portion of the pole ear of at least one of the soft-pack batteries that is not electrically connected to the adjacent soft-pack batteries is bent and clamped and fixed together with the busbar between the pole ear carrier and the crimping member to electrically connect the pole ear to the busbar.

[0039] In a third aspect, the present application provides an electrical device, including the soft pack battery assembly as described above. The beneficial effects of the present invention are:

[0040] The present application provides a soft-pack battery assembly, comprising at least one connecting device and at least two soft-pack batteries arranged in sequence. The connecting device comprises a tab carrier, a crimping member, and a connecting member connecting the tab carrier and the crimping member. The tab carrier is used to carry the tab, and the tab of the soft-pack battery can be placed on the tab carrier after being bent. Parts of the tabs of two adjacent soft-pack batteries are bent toward each other and clamped and fixed between the tab carrier and the crimping member, so that the two adjacent soft-pack batteries are electrically connected.

[0041] Compared with the prior art, the present application connects the pole ears of two adjacent soft-pack batteries by setting a connecting device, without the need for welding or bolting, and only uses the connecting device of the present application to fix the two adjacent pole ears. This non-welding connection method not only makes the production operation process of the entire battery assembly simpler, facilitates assembly and disassembly and maintenance, reduces the welding process of traditional soft-pack battery assemblies, improves the production and assembly efficiency of soft-pack batteries and corporate benefits, but also can meet different series and parallel wiring methods of soft-pack battery assemblies, and improve the adaptability of soft-pack battery assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of a connection device provided by an embodiment of the present invention.

[0043] Figure 2 yes Figure 1 Enlarged view of the local component at point A in the middle.

[0044] Figure 3 It is a schematic diagram of a connection device provided by an embodiment of the present invention in a closed mode.

[0045] Figure 4 It is a schematic diagram of a connection device provided by an embodiment of the present invention in an open mode.

[0046] Figure 5 It is a schematic diagram of an arc-shaped member of a connecting device in a closed mode provided by another embodiment of the present invention.

[0047] Figure 6 It is a schematic diagram of a connection device provided by another embodiment of the present invention in a closed mode.

[0048] Figure 7 It is a schematic diagram of a connection device provided in another embodiment of the present invention in an open mode.

[0049] Figure 8 yes Figure 4 and Figure 7 Enlarged view of the local component at point B in the middle.

[0050] Fig. 9 Schematic diagram of the connection between two adjacent soft-pack batteries provided according to an embodiment of the present invention.

[0051] Fig.10 Schematic diagram of the connection of two adjacent soft-pack batteries from another angle according to an embodiment of the present invention.

[0052] Fig.11 It is a schematic diagram of parallel connection of soft-pack batteries in a soft-pack battery assembly according to an embodiment of the present invention.

[0053] Fig.12It is a schematic diagram of soft-pack batteries connected in series in a soft-pack battery assembly according to an embodiment of the present invention.

[0054] The reference numerals in the specification are as follows:

[0055] 10. Connecting device;

[0056] 11. Tab carrier; 12. Pressing member; 13 (14). Connecting member; 130. Connecting piece; 131. First lead-out section; 132. Second lead-out section; 133. Arc section; 1331. First arc section; 1332. Second arc section; 141. Upper clamping plate; 1411. First fixing portion; 1412. First pressing portion; 142. Lower clamping plate; 143. Rotating shaft; 144. Elastic member; 1441. First extension end; 1442. Second extension end; 15. Protrusion; 16. First clamping member; 17. Second clamping member; 18. Baffle;

[0057] 21. positive busbar; 22. negative busbar;

[0058] 30. Sampling pieces;

[0059] 40. soft-pack battery; 41. soft-pack battery tab; 42. first battery; 43. second battery;

[0060] 50. Soft pack battery assembly;

[0061] M, accommodation gap; P, expansion gap; a, first preset angle; the radius of the arc where the first arc segment is located is R 1 ; The center angle of the first arc segment is θ 1 ; The radius of the arc where the second arc segment is located is R 2 ; The center angle of the arc where the second arc segment is located is θ 2 . DETAILED DESCRIPTION

[0062] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0063] The present application provides a soft pack battery assembly 50, such as Figure 1-12As shown, the soft-pack battery assembly 50 has at least two soft-pack batteries 40 arranged in sequence and at least one connecting device 10 for connecting two adjacent soft-pack battery tabs 41, and the connecting device 10 includes a tab carrier 11, a crimping member 12, and a connecting member 13 (14) connecting the tab carrier 11 and the crimping member 12. The tab carrier 11 is used to carry the tab, and the tab of the soft-pack battery 40 can be placed on the tab carrier 11 after the tab is partially bent. The tab carrier 11 is located at the same end of at least two of the soft-pack battery tabs 41, and the crimping member 12 is located on the side of the tab carrier 11 away from the soft-pack battery 40. Parts of the tabs 41 of two adjacent soft-pack batteries 40 are bent toward each other and clamped and fixed between the tab carrier 11 and the crimping member 12, so that the two adjacent soft-pack batteries are electrically connected.

[0064] Compared with the prior art, the present application connects the pole ears of two adjacent soft-pack batteries by setting a connecting device, without the need for welding or bolting, and only uses the connecting device of the present application to fix the two adjacent pole ears. This non-welding connection method not only makes the production operation process of the entire battery assembly simpler, facilitates assembly and disassembly and maintenance, reduces the welding process of traditional soft-pack battery assemblies, improves the production and assembly efficiency of soft-pack batteries and corporate benefits, but also can meet different series and parallel wiring methods of soft-pack battery assemblies, and improve the adaptability of soft-pack battery assemblies.

[0065] In one embodiment of the present application, Figure 1-7 As shown, the connection device 10 has two working modes, namely, an open mode and a closed mode. When the connection device 10 is in the open mode, the crimping member 12 deviates away from the direction of the tab carrier 11, and the crimping member 12 and the tab carrier 11 form a certain angle, and the tabs 41 of two adjacent soft-pack batteries 40 can be bent and placed in the tab carrier 11. When the connection device 10 is in the closed mode, the connection member 13 (14) presses the crimping member 12 to the tab carrier 11 to bend the tabs 41 of the two adjacent soft-pack batteries and fix them between the crimping member 12 and the tab carrier 11. The above two working modes are the working modes of the connection device in different application scenarios. Specifically, when the connection device is in the open mode, the soft-pack battery is in the assembly process or the repair and maintenance process; when the connection device is in the closed mode, the soft-pack battery is in the normal working process. In other words, the soft-pack battery assembly in this mode can be used normally.

[0066] In addition, the connecting device 10 also has an initial mode, that is, when the connecting device 10 is in the initial position. The initial position means that the connecting device is in a natural state and no force is applied to any component of the connecting device. At this time, the crimping part 12 and the end of the pole lug carrier 11 away from the connecting part 13 (14) abut each other, and there is an accommodating gap M between the crimping part 12 and the pole lug carrier 11. The spacing of the accommodating gap M gradually increases from the position where the crimping part 12 abuts the pole lug carrier 11 toward the direction close to the connecting part 13 (14), that is, the gap distance of the accommodating gap M is M, where M: 0≦M<2D, and D is the initial thickness of the pole lug 41 of the soft-pack battery. Specifically, within the entire accommodating gap M, the minimum distance of the accommodating gap M is the position where the crimping part 12 abuts the pole lug carrier 11, that is, 0; the maximum distance of the accommodating gap M is less than twice the initial thickness of the pole lug 41. The initial thickness of the tab 41 of the soft-pack battery refers to the thickness of the tab after the tab 41 of the soft-pack battery leaves the factory. The above distance is set so that when the tabs of two adjacent soft-pack batteries are bent and placed in the accommodation gap M, the crimping part 12 and the tab can be interference-fitted to fix the tab between the crimping part 12 and the tab carrier 11. Moreover, when the crimping part 12 is in the initial position, if the connecting member 13 (14) applies a force to the crimping part 12 in the direction toward the tab carrier 11 or the tab applies a force to the crimping part 12 in the direction away from the tab carrier, the connecting device 10 can be in an open mode or a closed mode, and further the tabs of two adjacent soft-pack batteries 40 can be placed between the crimping part 12 and the tab carrier 11 or clamped and fixed between the crimping part 12 and the tab carrier 11 after the tabs are bent.

[0067] In order to realize that the connecting member 13 (14) can press the crimping member 12 onto the tab carrier 11, in one embodiment of the present application, Figure 3-5 As shown, it discloses an implementation of a connector 13 (14). The connector 13 (14) is an elastic connector 130, which can make the crimping member 12 close to the tab carrier 11, so that the tabs of two adjacent soft-pack batteries 40 are clamped and fixed between the crimping member 12 and the tab carrier 11.

[0068] Specifically, the connector 13 (14) includes a first lead-out section 131, a second lead-out section 132, and an arc section 133 connecting the first lead-out section 131 and the second lead-out section 132. The first lead-out section 131 is connected to the crimping member 12, the second lead-out section 132 is connected to the tab carrier 11, and the first lead-out section 131 and the second lead-out section 132 are arranged in parallel. The connector 13 (14) is an elastic metal member. Because the connector 13 (14) is an elastic metal member, and because of the design of the arc section 133, the first lead-out section 131 always applies a force to the crimping member 12 in the direction of the tab carrier 11, so as to further stably connect the tabs of two adjacent soft-pack batteries 40 between the crimping member 12 and the tab carrier 11.

[0069] And in the above embodiment, Figure 3-5 as well as Figure 8 As shown, when the connection device 10 is in the closed mode, there is a second preset distance between the first lead-out section 131 and the second lead-out section 132, and the gap is the accommodation gap distance. The present application uses the design of the arc segment 133 to ensure that the connection device 10 can ensure the interference fit between the crimping part 12 and the connection formed by the partial bending of the two adjacent tabs 41 in the closed mode, and maintain the gap distance between the crimping part 12 and the tab carrier 11. When the connection device 10 is in the open mode, that is, when a force is applied to the crimping part 12 away from the tab carrier 11, the crimping part 12 moves away from the tab carrier 11, thereby expanding the gap distance between the crimping part 12 and the tab carrier 11, so that the tabs 41 of the two adjacent soft-pack batteries can be conveniently placed on the tab carrier 11 after bending. And at this time, as the accommodation gap distance increases, the second preset distance also increases, that is, the increase in the gap distance drives the first lead-out section 131 to move away from the second lead-out section 132. However, since the connector 13 (14) is an elastic metal part, the first lead section 131 still wants to move toward the second lead section 132 to maintain the second preset distance between the first lead section 131 and the second lead section 132. Therefore, when the connecting device 10 is in the open mode, a force away from the tab carrier 11 must be applied to the connecting device 10 to maintain the connecting device 10 in the open mode. Once the force away from the tab carrier 11 is not applied to the connecting device 10, the connecting device 10 jumps from the open mode to the closed mode. Therefore, when the connecting device 10 is applied to the soft-pack battery pack 50, the connecting device 10 can only be opened when a force away from the tab carrier 11 is applied to the crimping part 12. If the above conditions are not met, the connecting device 10 is always in the closed mode to prevent the soft-pack battery tab 41 from falling off from the connecting device 10 and improve the stability of the tab connection.

[0070] Furthermore, in order to further improve the connection reliability of the connection device 10, as Figure 5 As shown, the arc segment 133 includes a first arc segment 1331 and a second arc segment 1332, one end of the first arc segment 1331 is connected to the first lead-out segment 131, one end of the second arc segment 1332 is connected to the second lead-out segment 132, and the arc where the first arc segment 1331 is located is tangent to the arc where the second arc segment 1332 is located. The center of the arc where the first arc segment 1331 is located is located on the side of the first lead-out segment 131 away from the second lead-out segment 132, and the center of the arc where the second arc segment 1332 is located is located between the first lead-out segment 131 and the second lead-out segment 132.

[0071] Furthermore, when the crimping member 12 is in the initial position, the radius of the arc where the first arc segment 1331 is located is R 1 , the unit is m, the center angle of the arc where the first arc segment 1331 is located is θ 1 The radius of the arc where the second arc segment 1332 is located is R 2 , the unit is m, and the center angle of the arc where the second arc segment 1332 is located is θ 2 ,

[0072] Among them, in order to ensure the existence of downward pressing force component requirement θ 2 >180°, to ensure that the crimping part does not warp upward, θ 2 <270°, so 180°<θ 2 <270°, the larger the angle, the smaller the downward pressure force generated.

[0073] At this time, the central angle θ of the first arc segment 1331 is 1 and the central angle θ of the second arc segment 1332 2 The following relations are satisfied:

[0074] θ 2 -θ 1 =180°;

[0075] 180°<θ 2 <270°;

[0076] In order to prevent the second arc segment 1332 from causing excessive stress at right angles to the plane, a first arc segment 1331 is designed, and its radius is R 1 The following relations are satisfied:

[0077] R 1 ≥2t, where t is the thickness of the arc segment 133, in m;

[0078] When the connecting device 10 is in a closed state, as shown in the figure, the crimping part 12 has an upward displacement of ΔX, the unit of which is m, thereby causing the arc-shaped part to have an upward displacement of Δθ 1The angular displacement of the arc-shaped part produces a deformation of ΔL, which in turn produces F n The downward pressing force of the arc part is in N. n The calculation principle is as follows:

[0079]

[0080] In the above relationship, K is the contact constant (dimensionless) of the contact material, which varies with different materials. For aluminum-copper contact, the contact constant K = 0.98 × 10 -3 .

[0081] R j is the tab contact resistance. When the contact resistance is too large, the tab current capacity of the soft-pack battery 40 is weaker. On the contrary, when the contact resistance is too large, the tab current capacity of the soft-pack battery 40 is stronger. Therefore, under normal circumstances, R j Calculate using the following formula:

[0082]

[0083] Among them, R c Indicates the total resistance of the conductor, in Ω; U c It indicates the voltage value at both ends of the conductor connection, the unit is V; I indicates the overcurrent value of the conductor, the unit is A;

[0084] R c =R 0 +R j

[0085] Among them, R 0 is the resistance of the conductor material itself.

[0086] In order to ensure the current capacity of the tab of the soft pack battery 40, by limiting R j The size of the connection device 10 meets the relevant requirements.

[0087] At this time, in the limit R j When the size of F n is a known parameter, so R 2 The following relations are satisfied:

[0088]

[0089] Wherein, ΔL is the compression deformation of the arc segment 133, in m, which can be measured by setting a strain sensor on the arc segment 133. E is the elastic modulus of the material of the arc segment 133, in N / m 2, which varies with the material of the arc segment 133. The elastic modulus can be obtained through relevant conventional tests and is not further defined here. A is the cross-sectional area of ​​the arc segment 133, in m 2 .

[0090] The units of the above parameters are all formula conversion units, but the units in actual working conditions are generally set according to actual needs.

[0091] In order to realize that the connecting member 13 (14) can press the crimping member 12 to the tab carrier 11, in another embodiment of the present application, as Figure 6-8 As shown, it discloses another embodiment of the connector 13 (14). Specifically, the connector 13 (14) includes an upper clamping plate 141, a lower clamping plate 142, a rotating shaft 143 and an elastic member 144. The elastic member 144 is located between the upper clamping plate 141 and the lower clamping plate 142 and is sleeved in the rotating shaft 143. The upper clamping plate 141 and the lower clamping plate 142 can be rotatably connected through the rotating shaft 143. One end of the upper clamping plate 141 is connected to the crimping member 12, and one end of the lower clamping plate 142 is connected to the tab carrier 11. One end of the elastic member 144 abuts against the upper clamping plate 141, and the other end abuts against the lower clamping plate 142, so as to drive the crimping member 12 to approach the tab carrier 11 through the upper clamping plate 141, so that the crimping member 12 and the tab carrier 11 clamp and fix the tabs 41 of the two adjacent soft-pack batteries.

[0092] Specifically, the upper clamping plate 141 has a first fixing portion 1411 and a first pressing portion 1412 in sequence, one end of the first fixing portion 1411 is connected to the crimping member 12, and the first pressing portion 1412 is bent in a direction away from the lower clamping plate 142. The lower clamping plate 142 is a horizontal plate, and the first fixing portion 1411 is arranged in parallel with the lower clamping plate 142. The elastic member 144 has a first extending end 1441 and a second extending end 1442, the first extending end 1441 abuts against the first pressing portion 1412 of the upper clamping plate 141, and the second extending end 1442 abuts against the lower clamping plate 142. In other words, when the connecting device 10 is in a closed mode, the first extending end 1441 and the second extending end 1442 form a first preset angle a, and at this time, the gap distance between the crimping member 12 and the tab carrier 11 is an accommodating gap distance. When the connection device 10 is in the open mode, the first preset angle a between the first extension end 1441 and the second extension end 1442 decreases, and the accommodation gap distance between the crimping member 12 and the tab carrier 11 increases.

[0093] Furthermore, in this embodiment, if Figure 6-8As shown, when the connecting device 10 is in the open mode, that is, when the first pressing portion 1412 of the upper clamping plate 141 of the connecting member 13 (14) applies a force toward the lower clamping plate 142, the first pressing portion 1412 of the upper clamping plate 141 moves toward the lower clamping plate 142, so that the first preset angle a between the first extension end 1441 and the second extension end 1442 of the elastic member 144 is reduced, thereby increasing the distance between the position where the upper clamping plate 141 is connected to the crimping member 12 and the position where the lower clamping plate 142 is connected to the tab carrier 11, thereby increasing the gap distance between the crimping member 12 and the tab carrier 11, that is, increasing the accommodating gap distance, so that the connecting device 10 is in the open mode, so that the tab portions of two adjacent soft-pack batteries 40 can be conveniently placed on the tab carrier 11 after being bent. In the present embodiment, the material of the upper clamping plate 141 and the lower clamping plate 142 does not need to be considered. The main reason why the connecting device 10 can stably clamp the pole ear is that the first extension end 1441 and the second extension end 1442 of the elastic member 144 form a first preset angle a, which enables the connecting device 10 to stably clamp the pole ear in the closed mode. If one wants to change the mode of the connecting device 10, it is necessary to apply a certain force to the first pressing portion 1412 of the upper clamping plate 141 of the connecting member 13 (14). Therefore, when the connecting device 10 is used in the soft-pack battery assembly 50, after the connecting device 10 is used to connect and fix the pole ears of two adjacent soft-pack batteries 40, if no force away from the pole ear carrier 11 is applied to the connecting member 13 (14), the connecting device 10 cannot be opened, and the pole ear cannot be detached from the connecting device 10, thereby improving the reliability of the pole ear connection.

[0094] In other embodiments of the present application, the connector 13 (14) can ensure that when the connection device 10 is in the closed mode, a force is applied to the crimping member 12 in the direction of the tab carrier 11 to stably clamp the tab. To change the working mode of the connection device 10, that is, to change from the closed mode to the open mode, it is necessary to apply a force away from the tab carrier 11 to the crimping member 12 or the connector 13 (14) to meet the selection of the connector 13 (14) of the present application. On the premise of meeting the above functions, the material of the connector 13 (14) can be selected appropriately.

[0095] Compared with the prior art, the connection device disclosed in the present application does not require the use of expensive welding equipment and does not require related welding processes to be implemented, thereby reducing the process cost of manufacturing battery assemblies. At the same time, the connection device disclosed in the present application does not require the design of a tooling fixture for fixing the welding pole ears, thereby greatly reducing production costs. There is also no need to transport the module to the instrument workshop. The connection device disclosed in the present application can be used to clamp and fix the pole ears of two adjacent soft-pack batteries to complete the connection of the pole ears of two adjacent soft-pack batteries. The operation is portable and saves transportation time.

[0096] In order to further prevent the tabs of two adjacent soft-pack batteries from being separated from the lug carrier and the tab carrier of the connection device, in one embodiment of the present application, the tab carrier 11 of the connection device 10 is provided with a first clamping member 16, and the clamping member 12 is provided with a second clamping member 17. When the tabs 41 of two adjacent soft-pack batteries are clamped and fixed between the tab carrier 11 and the clamping member 12, the first clamping member 16 is clamped and fixed with the second clamping member 17. The connection device 10 disclosed in the present application can also enable the clamping member 12 to be stably fixed to the tab carrier 11 through the cooperation of the first clamping member 16 and the second clamping member 17, so that when the connection device 10 is in the closed mode, the connection member 13 (14) and the clamping member 12 are used to apply a force toward the tab carrier 11 to the clamping member 12, so as to enhance the pressing force of the clamping member 12 on the tab, and further prevent the tab from being separated from the connection device 10.

[0097] Furthermore, if Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Fig. 9 As shown, in order to further prevent the tab 41 from detaching from the connecting device 10, the first clamping member 16 is arranged at one end of the crimping member 12 away from the connecting member 13 (14), and the second clamping member 17 is arranged at one end of the tab carrier 11 away from the connecting member 13 (14). At this time, for the entire crimping member 12, both sides thereof are provided with components capable of providing a clamping force, namely, the first clamping portion and the connecting member 13 (14). When the connecting device 10 is in the closed mode, both sides of the tab along the direction from the connecting member 13 (14) to the first clamping portion are subjected to a downward clamping force, thereby improving the clamping effect of the crimping member 12 on the tab 41 of the soft-pack battery 40, and further preventing the tab from detaching from the connecting device 10.

[0098] In addition, in one embodiment of the present application, Figure 1-2As shown, the crimping member 12 of the connection device 10 further includes a plurality of protrusions 15 facing one side of the tab carrier 11. When the connection device 10 is in the closed mode, that is, when the tabs 41 of the two connected soft-pack batteries are clamped and fixed between the tab carrier 11 and the crimping member 12, the protrusions 15 abut against the tabs 41 of the soft-pack batteries. Specifically, when the connection device 10 is in the closed mode, the crimping member 12 is used to clamp the tabs 41 of the two adjacent soft-pack batteries, that is, the crimping member 12 abuts against the tabs 41 of the two adjacent soft-pack batteries to compress the tabs. In order to make the crimping part 12 better abut against the tabs 41 of two adjacent soft-pack batteries, the crimping part 12 is provided with a protrusion 15, so that the position where the protrusion 15 is provided on the crimping part 12 has a higher degree of interference fit with the tab than other positions, thereby increasing the pressing force of the crimping part 12 on the tab, and further ensuring that the tabs of two adjacent soft-pack batteries 40 can be stably connected between the crimping part 12 and the tab carrier 11 of the connecting device 10. Preferably, the height of the protrusion 15 can be selected to be 0.1-0.5 mm. The protrusion can be processed into various shapes such as a regular tetrahedron, a hemisphere, a cylinder, and a cuboid.

[0099] In the implementation of this application, if Figure 9-10 As shown, the tab carrier 11 is provided with two baffles 18, and the two baffles 18 are respectively protrudingly arranged at one end of the tab carrier 11 away from the connector 13 (14) and extending in the direction of the tab bearing portion. The baffles 18 and the tab carrier 11 are enclosed to form a battery accommodating space, and a part of two soft-pack batteries 40 electrically connected by the connecting device 10 is arranged in the battery accommodating space. The present application discloses that the connecting device 10 is used to fix the connecting device 10 to two adjacent soft-pack batteries 40 by setting a baffle 18. Specifically, when the connecting device 10 is arranged between two adjacent soft-pack batteries 40, a single soft-pack battery 40 is respectively located in the battery accommodating space between the baffle 18 and the tab carrier 11, and the two baffles 18 are respectively bonded to the soft-pack batteries 40 in contact with them.

[0100] Furthermore, if Figure 9-10As shown, at least two soft-pack batteries 40 are arranged in sequence along the thickness direction, and the two soft-pack batteries 40 electrically connected by the connecting device 10 are respectively a first battery 42 and a second battery 43, and the first battery 42 and the second battery 43 respectively have opposite sides along the thickness direction, and the two sides of the first battery 42 and the second battery 43 that are away from each other are bonded and fixed to the two baffles 18 one by one, and there is an expansion gap P between the opposite side plates of the first battery 42 and the second battery 43. The connecting device 10 disclosed in the present application defines the expansion gap P between the two soft-pack batteries 40 so that the soft-pack batteries 40 can expand during use. Specifically, when the distance between the extensions of the two baffles 18 is greater than the sum of the thicknesses of the two adjacent soft-pack batteries 40, that is, there is an expansion gap P between the opposite sides of the two soft-pack batteries 40, and the extensions of the soft-pack batteries 40 are bonded and contacted, there is an expansion space between the two adjacent soft-pack batteries 40. When the soft-pack battery 40 expands due to heat, it expands into the expansion space. In summary, the provision of the baffle 18 not only facilitates the positioning of the connecting device 10, but also can reserve space for the expansion of the soft-pack battery cell, eliminating the need for an additional battery buffer assembly, thereby simplifying the battery assembly structure.

[0101] In the embodiment of the present application, the crimping member 12, the connecting member 13 (14) and the tab carrier 11 are integrally formed. The integrally formed connecting device 10 is convenient for practical operation, saves manufacturing cost and reduces use risk.

[0102] In one embodiment of the present application, Figure 11-12 As shown, in the soft-pack battery assembly 50 disclosed in the present application, the soft-pack battery assembly 50 also includes a busbar, which is used to guide the current of the soft-pack battery assembly 50 to flow out or flow in. A portion of the pole ear of at least one of the soft-pack batteries 40 that is not electrically connected to the adjacent soft-pack batteries 40 is bent and clamped and fixed between the pole ear carrier 11 and the crimping member 12 together with the busbar, so that the pole ear is electrically connected to the busbar. Generally, in a soft-pack battery assembly 50, there are at least two busbars, one of which is connected to the positive electrode of the soft-pack battery assembly 50, and the other is connected to the negative electrode of the soft-pack battery assembly 50. Among them, in order to connect the busbar to the positive or negative electrode of the soft-pack battery 40, one end of a busbar is bent with the pole ear of the soft-pack battery 40 and fixed between the crimping member 12 of the connecting device 10 and the pole ear carrier 11, and the other end of the busbar is used to lead out the current of the soft-pack battery assembly 50. In the soft-pack battery assembly 50 disclosed in the present application, the busbar is also connected to the positive side or the negative side of the soft-pack battery assembly 50 through the connecting device 10, so that the production operation process of the entire battery assembly is simpler and convenient for assembly, disassembly and maintenance.

[0103] In addition, if Figure 11-12As shown, in the soft-pack battery assembly 50 disclosed in the present application, the soft-pack battery assembly 50 also includes a sampling piece 30, which is used to collect information such as voltage and current of the soft-pack battery 40. The soft-pack battery assembly 50 is provided with a plurality of sampling pieces 30, one end of each sampling piece 30 is bent with the tab of the soft-pack battery 40 and fixed between the crimping piece 12 and the tab bearing piece 11 of the connecting device 10, and the other end of the sampling piece 30 is used to draw out the current of the soft-pack battery assembly 50.

[0104] In the soft-pack battery assembly 50 disclosed in the present application, whether it is the connection of the tabs of the soft-pack battery 40, the connection of the busbar of the soft-pack battery assembly 50, or the connection of the sampling piece 30, they are all connected through the connection device 10 disclosed in the present application. Not only does it reduce the connection operations of welding and other processes, it makes the production operation process of the entire battery assembly simpler and convenient for assembly, disassembly and maintenance; it also reduces the connection methods such as bolt fixing, reduces the cost of the connector 13 (14), and improves the production and assembly efficiency of the soft-pack battery 40 and the benefits of the enterprise.

[0105] The following is an explanation of the series connection of the soft-pack battery 40 in the soft-pack battery assembly 50 disclosed in the present application:

[0106] like Fig.11 As shown, a plurality of the soft-pack batteries 40 are arranged in sequence, and the positive and negative ears of two adjacent soft-pack batteries 40 are arranged on the same side. Along the arrangement direction of the soft-pack batteries 40, the positive and negative ears of two adjacent soft-pack batteries 40 are bent and fixed between the crimping member 12 and the ear bearing member 11, so that the two adjacent soft-pack batteries 40 are connected in series. The outermost soft-pack battery 40 of the soft-pack battery assembly 50 has a positive ear that is not connected to the negative ear of the adjacent soft-pack battery 40, which is bent together with one end of the positive bus 21 and fixedly connected through the connecting device 10, and the other end of the positive bus 21 is connected to the positive electrode of the battery management system or the positive electrode of other electrical equipment; the outermost soft-pack battery 40 of the soft-pack battery assembly 50 has a negative ear that is not connected to the positive ear of the adjacent soft-pack battery 40, which is bent together with one end of the negative bus 22 and fixedly connected through the connecting device 10, and the other end of the negative bus 22 is connected to the negative electrode of the battery management system or the negative electrode of other electrical equipment. A sampling component 30 is provided in each connecting device 10 , and battery information of each soft-pack battery 40 is obtained through the sampling component 30 .

[0107] The following is an explanation of the series connection of the soft-pack battery 40 in the soft-pack battery assembly 50 disclosed in the present application:

[0108] like Fig.12As shown, two or more adjacent soft-pack batteries 40 are connected in series through the connecting device 10 to form a soft-pack battery 40 string, and the soft-pack battery 40 string has a battery string positive ear and a battery string negative ear. Multiple soft-pack battery 40 strings are arranged in sequence, and the battery string negative ear and one end of the negative bus 22 of two adjacent soft-pack battery 40 strings are fixedly connected through the connecting device 10, and the other end of the negative bus 22 is connected to the negative electrode of the battery management system or the negative electrode of other electrical equipment; the positive ears of two adjacent soft-pack battery 40 strings are respectively fixedly connected to one end of a separate positive bus 21 through the connecting device 10, and the other end of the separate positive bus 21 is connected to the positive electrode of the battery management system or the positive electrode of other electrical equipment.

[0109] In a second aspect, the present application further discloses an electrical device, which includes the soft-pack battery assembly 50 described above.

[0110] In the description of the present invention, it is to 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”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0111] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0112] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the communication between the internal parts of two components or the interaction relationship between two components, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0113] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A soft pack battery assembly, characterized in that: At least two soft-pack batteries arranged in sequence; At least one connecting device, the connecting device comprising a tab carrier, a crimping member, and a connecting member connecting the tab carrier and the crimping member, the tab carrier being located at the same end of the tabs of at least two of the soft-pack batteries, and the crimping member being located at a side of the tab carrier away from the soft-pack battery; Parts of the tabs of two adjacent soft-pack batteries are bent toward each other and clamped and fixed between the tab carrier and the crimping member, so that the two adjacent soft-pack batteries are electrically connected; The connecting device further comprises baffles provided at opposite sides of the tab carrier, the baffles extending in the direction of the tab carrier, the baffles and the tab carrier enclose a receiving space, and a part of the two soft-pack batteries electrically connected by the connecting device is located in the receiving space; At least two of the soft-pack batteries are arranged in sequence along the thickness direction, and the two soft-pack batteries electrically connected by the connecting device are respectively a first battery and a second battery, the first battery and the second battery respectively have side surfaces opposite to each other along the thickness direction, and the two side surfaces of the first battery and the second battery facing away from each other are bonded and fixed to the two baffles one by one.

2. The soft pack battery assembly according to claim 1, characterized in that: When the crimping member is at an initial position, the crimping member abuts against an end of the tab carrier away from the connecting member; In the direction from the crimping piece to the tab carrier, there is an accommodation gap between the tab carrier and the crimping piece, and the distance of the accommodation gap gradually increases from the position where the crimping piece and the tab carrier abut against each other to the direction of the connecting piece, and the distance of the accommodation gap is M. Wherein, M: 0≦M<2D, where D is the initial thickness of the soft-pack battery tab.

3. The soft pack battery assembly according to claim 1, characterized in that: The connecting member is an elastic connecting piece, which can make the crimping member close to the tab carrier, so that the tabs of two adjacent soft-pack batteries are clamped and fixed between the crimping member and the tab carrier.

4. The soft pack battery assembly according to claim 3, characterized in that: The connecting piece comprises a first lead-out section, an arc section and a second lead-out section which are connected in sequence, the first lead-out section and the second lead-out section are arranged in parallel, the first lead-out section is connected to the crimping piece, and the second lead-out section is connected to the tab bearing piece; The arc segment can drive the crimping component to approach the tab carrier through the first lead-out segment.

5. The soft pack battery assembly according to claim 4, characterized in that: The arc segment includes a first arc segment and a second arc segment, one end of the first arc segment is connected to the first lead-out segment, one end of the second arc segment is connected to the second lead-out segment, and the arc where the first arc segment is located is tangent to the arc where the second arc segment is located; The center of the arc where the first arc segment is located is located on the side of the first lead-out segment away from the second lead-out segment, and the center of the arc where the second arc segment is located is located between the first lead-out segment and the second lead-out segment.

6. The soft pack battery assembly according to claim 5, characterized in that: When the crimping component is in the initial position, the arc radius of the first arc segment is R1, the arc center angle of the first arc segment is θ1, the arc radius of the second arc segment is R2, the arc center angle of the second arc segment is θ2, The center angle θ1 of the first arc segment and the center angle θ2 of the second arc segment satisfy the following relationship: θ2-θ1=180°; 180°<θ2<270°; R1 satisfies the following relationship: R1≥2t, where t is the thickness of the arc segment; R2 satisfies the following relationship: E is the elastic modulus of the arc segment material; ΔL is the compression deformation of the arc segment; A is the cross-sectional area of ​​the arc segment; F n A downward pressing force provided to the arc segment; Among them, the F n The following relations are satisfied: R j is the contact resistance of the tab, and K is the contact constant of the contact material.

7. The soft pack battery assembly according to claim 1, characterized in that: The connecting member comprises an upper clamping plate, a lower clamping plate, a rotating shaft and an elastic member, wherein the elastic member is located between the upper clamping plate and the lower clamping plate and is sleeved in the rotating shaft, and the upper clamping plate and the lower clamping plate can be rotatably connected via the rotating shaft; The upper clamping plate is connected to the crimping piece, the lower clamping plate is connected to the tab carrier, one end of the elastic piece abuts against the upper clamping plate, and the other end abuts against the lower clamping plate, so that the crimping piece is driven to approach the tab carrier through the upper clamping plate, thereby enabling the crimping piece and the tab carrier to clamp and fix the tabs of two adjacent soft-pack batteries.

8. The soft pack battery assembly according to claim 7, characterized in that: The upper clamping plate has a first fixing portion and a first pressing portion in sequence, one end of the first fixing portion is connected to the crimping piece, and the first pressing portion is bent in a direction away from the lower clamping plate; The lower clamping plate is a horizontal plate, and the first fixing portion is arranged parallel to the lower clamping plate; The elastic member has a first extending end and a second extending end, the first extending end abuts against the first pressing portion of the upper clamping plate, and the second extending end abuts against the lower clamping plate.

9. The soft pack battery assembly according to claim 1, characterized in that: The tab carrier is provided with a first clamping member, and the crimping member is provided with a second clamping member. When the tabs of two adjacent soft-pack batteries are clamped and fixed between the tab carrier and the crimping member, the first clamping member is clamped and fixed with the second clamping member.

10. The soft pack battery assembly according to claim 1, characterized in that: The side of the crimping member facing the tab carrier has a plurality of protrusions, and when the tabs of two connected soft-pack batteries are clamped and fixed between the tab carrier and the crimping member, the protrusions abut against the tabs.

11. The soft pack battery assembly according to claim 1, characterized in that: An expansion gap is defined between opposite sides of the first battery and the second battery.

12. The soft pack battery assembly according to any one of claims 1 to 11, characterized in that: The crimping component, the connecting component and the tab carrier are integrally formed.

13. The soft pack battery assembly according to claim 1, characterized in that: The soft-pack battery assembly also has a busbar, and a portion of the tab of at least one of the soft-pack batteries that is not electrically connected to the adjacent soft-pack batteries is bent and clamped and fixed together with the busbar between the tab carrier and the crimping member to electrically connect the tab to the busbar.

14. An electrical device, characterized in that: Comprising a soft-pack battery assembly as described in any one of claims 1-13.

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