Battery module

Abstract

The embodiment of the utility model relates to the technical field of energy storage, and discloses a battery module and energy storage equipment, and the battery module comprises a bracket, a battery core assembly, a circuit board and an electric connecting piece, the battery cell assembly is arranged on the bracket; the circuit board is arranged on the support, and a welding area is arranged on the first surface of the circuit board; one end of the electric connecting piece is electrically connected with the battery cell assembly, the other end of the electric connecting piece is provided with at least two first welding parts which are distributed at intervals, each first welding part is welded and fixed with the welding area, and a partition groove is formed between every two adjacent first welding parts. Through the above mode, the embodiment of the utility model can reduce the pulling stress between the first welding parts, thereby reducing the risk that the first welding parts are separated from the welding area, and improving the connection strength between the electric connector and the circuit board.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of energy storage technology, and in particular to a battery module. Background Art

[0002] In related technologies, a battery module includes a circuit board, an electrical connector, and a cell assembly. The cell assembly is composed of multiple cells connected in series, parallel, or mixed. One end of the electrical connector is connected to the cell assembly, and the other end is welded to a connection portion on the circuit board to achieve an electrical connection between the circuit board and the cell assembly. To improve the connection strength and current carrying capacity between the electrical connector and the connection portion, multiple bumps are typically provided on the connection portion, and the electrical connector is welded to the multiple bumps.

[0003] During the implementation of the embodiments of the present invention, the inventors found that when the above-mentioned method is adopted, the tensile stress between the solder joints on the electrical connector is relatively large. Under the action of the tensile stress, some solder joints are easily detached, affecting the connection strength between the electrical connector and the circuit board. Utility Model Content

[0004] The main technical problem solved by the embodiments of the present invention is to provide a battery module and energy storage device, which can reduce the tensile stress between each first welding part, thereby reducing the risk of the first welding part being separated from the welding area, and improving the connection strength between the electrical connector and the circuit board.

[0005] In order to solve the above technical problems, a technical solution adopted in an embodiment of the present utility model is: providing a battery module, including a bracket, a battery cell assembly, a circuit board and an electrical connector; the battery cell assembly is arranged on the bracket; the circuit board is arranged on the bracket, and a welding area is provided on the first surface of the circuit board; one end of the electrical connector is electrically connected to the battery cell assembly, and the other end is provided with at least two first welding parts distributed at intervals, each first welding part is welded and fixed to the welding area, and a partition groove is provided between each two adjacent first welding parts.

[0006] In some embodiments, the first welding portion includes a first sub-welding portion and a second sub-welding portion that are spaced apart. The first sub-welding portion and the second sub-welding portion are both welded and fixed to the welding area, and a first shunt groove is provided between the first sub-welding portion and the second sub-welding portion.

[0007] In some embodiments, the bracket is provided with a supporting portion, the second surface of the circuit board abuts the supporting portion, the first surface and the second surface are opposite, along the first direction, the projection of the welding area at least partially overlaps with the projection of the supporting portion, and the first direction is perpendicular to the first surface.

[0008] In some embodiments, the bracket is provided with a plurality of support portions distributed in an array, and the second surface abuts against the plurality of support portions, wherein along the first direction, a projection of the welding area at least partially overlaps with a projection of at least one support portion.

[0009] In some embodiments, the electrical connector includes a first connecting section and a second connecting section, the first connecting section is welded and fixed to the battery cell assembly, and each first welding portion is arranged at an end of the second connecting section away from the first connecting section. Along the first direction, the battery cell assembly, the support portion, the circuit board and the second connecting section are arranged in sequence.

[0010] In some embodiments, the first connecting section includes at least one second welding portion, the second welding portion includes a third sub-welding portion and a fourth sub-welding portion, and the first connecting section is also provided with a second shunt groove, and at least a portion of the second shunt groove is located between the third sub-welding portion and the fourth sub-welding portion, and the third sub-welding portion and the fourth sub-welding portion are both used to be welded and fixed to the battery cell assembly.

[0011] In some embodiments, the second diversion groove includes a first groove body, a second groove body, a third groove body, a first connecting groove and a second connecting groove. The first groove body, the second groove body and the third groove body are arranged in sequence, the third sub-welding portion is located between the first groove body and the second groove body, and the fourth sub-welding portion is located between the second groove body and the third groove body; one end of the first connecting groove is connected to one end of the first groove body, and the other end is connected to one end of the second groove body, the end of the second groove body away from the first connecting groove is connected to one end of the second connecting groove, and the other end of the second connecting groove is connected to the third groove body.

[0012] In some embodiments, the bracket includes a first frame and a second frame, the first frame and the second frame jointly form a receiving groove, part of the battery cell assembly is accommodated in the receiving groove, one end of the electrical connector is welded and fixed to the part of the battery cell assembly protruding from the receiving groove, wherein the first frame and the second frame are detachably fixed.

[0013] In some embodiments, the battery module further includes a plurality of connecting plates; the battery cell assembly includes a plurality of battery cells, the plurality of battery cells are all arranged in the accommodating groove, the plurality of battery cells are electrically connected through a plurality of connecting plates, and the electrical connector is electrically connected to at least one battery cell.

[0014] In some embodiments, the battery module includes at least two electrical connectors, at least one electrical connector is electrically connected to the positive pole of the battery cell assembly, and at least one electrical connector is electrically connected to the negative pole of the battery cell assembly; the first surface of the circuit board is provided with at least two welding areas, at least two welding areas are spaced apart from each other, and an electrical connector is welded and fixed to a welding area.

[0015] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide an energy storage device, including the above battery module.

[0016] The beneficial effects of the embodiments of the present invention are as follows: different from the prior art, in the embodiments of the present invention, by arranging the battery cell assembly and the circuit board on a bracket, a welding area is arranged on the first surface of the circuit board, one end of the electrical connector is electrically connected to the battery cell assembly, and at least two spaced-apart first welding portions are arranged at the other end of the electrical connector, each first welding portion is welded and fixed to the welding area, thereby realizing electrical connection between the battery cell assembly and the circuit board, and a partition groove is provided between each two adjacent first welding portions, thereby reducing the tensile stress between the first welding portions, thereby reducing the risk of the first welding portion being detached from the welding area, and improving the connection strength between the electrical connector and the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic structural diagram of a battery module provided in an embodiment of the present utility model at a first viewing angle;

[0019] Figure 2 yes Figure 1 Magnified view of the area shown in part A;

[0020] Figure 3 This is a schematic diagram of the exploded structure of the battery module provided in an embodiment of the present utility model;

[0021] Figure 4 It is a schematic diagram of the welding principle of resistance welding;

[0022] Figure 5 This is a schematic structural diagram of a battery module provided in an embodiment of the present utility model at a second viewing angle;

[0023] Figure 6 A schematic structural diagram of the second welding portion and the second diverter groove provided in an embodiment of the present invention when the second diverter groove is in a straight line shape;

[0024] Figure 7 A schematic structural diagram of the second welding portion and the second diverter groove provided in an embodiment of the present invention when the second diverter groove is in an I-shape;

[0025] Figure 8 Schematic diagram of the structure of the second welding portion and the second diverter groove provided in an embodiment of the present invention when the second diverter groove is S-shaped;

[0026] Figure 9A schematic structural diagram of the second welding portion and the second diverter groove provided in an embodiment of the present invention when the second diverter groove is in a mountain shape;

[0027] Figure 10 This is a structural schematic diagram of the second welding portion and the second diverter groove provided in an embodiment of the present invention when the second diverter groove includes an extended groove. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as being "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "upper", "lower", "inside", "outside", "vertical", "horizontal", etc. used in this specification indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the present invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] See also Figure 1 and Figure 2The battery module 100 includes a bracket 1, a battery cell assembly 2, a circuit board 3, and an electrical connector 4. The battery cell assembly 2 is fixed to the bracket 1, and the circuit board 3 is disposed on the bracket 1. A welding area 311 is provided on the first surface 31 of the circuit board 3, and the first surface 31 faces away from the bracket 1. One end of the electrical connector 4 is welded to the battery cell assembly 2, and the other end of the electrical connector 4 is provided with at least two first welding portions 421. The at least two first welding portions 421 are spaced apart, and each first welding portion 421 is welded to the welding area 311, thereby achieving electrical connection between the battery cell assembly 2 and the circuit board 3. A partition groove 422 is provided between each two adjacent first welding portions 421. In this embodiment, by providing at least two first welding portions 421 on the electrical connector 4, each first welding portion 421 is welded and fixed to the welding area 311 on the first surface 31, which can improve the connection strength between the electrical connector 4 and the welding area 311, and can increase the contact area between the electrical connector 4 and the welding area 311, which is beneficial to reducing the resistance between the electrical connector 4 and the welding area 311, thereby reducing heat generation; in addition, by providing a partition groove 422 between each two adjacent first welding portions 421, the partition groove 422 can form a buffer between the two first welding portions 421, which can reduce the tensile stress between the two adjacent first welding portions 421, and reduce the risk of the first welding portion 421 detaching from the welding area 311 under the action of the tensile stress, which is beneficial to improving the connection strength between the electrical connector 4 and the welding area 311.

[0032] In some embodiments, along the second direction Y, the projection of each first welding portion 421 is located within the projection of the partition groove 422, thereby enhancing the buffering effect of the partition groove 422 on the tensile stress between two adjacent first welding portions 421, wherein the second direction Y is parallel to the first surface 31 of the circuit board 3, and the second direction Y is parallel to the arrangement direction of each first welding portion 421.

[0033] In some embodiments, each first welding portion 421 is fixed to the welding region 311 by at least one of laser welding, resistance welding, or soldering.

[0034] In some embodiments, the electrical connector 4 and the battery cell assembly 2 are fixed by welding through at least one of laser welding, resistance welding or soldering.

[0035] In some embodiments, the electrical connector 4 is made of at least one metal material such as copper, aluminum, and nickel.

[0036] It is worth noting that for laser welding, the wavelength of the laser used is usually infrared light between 760nm and 1mm. However, the absorption rate of copper metal to infrared light at room temperature is only 3-5%, and it has high thermal conductivity. Therefore, it is difficult to weld copper with infrared laser, spatter is also serious, and the welding quality is unstable. For tin soldering, its welding efficiency is low, and it is difficult to avoid the generation of tin slag due to the volatilization of flux during the welding process. If the tiny tin slag is not completely cleaned, it may cause adverse conditions such as short circuit of devices on the circuit board 3. Therefore, in this embodiment, resistance welding is used to weld and fix each first welding portion 421 to the welding area 311 and between the electrical connector 4 and the battery cell assembly 2. Compared with the other two welding methods, its welding quality is more stable and no tin slag is generated, thereby reducing the risk of defective products on the circuit board 3.

[0037] Among them, see Figure 4 The principle of resistance welding is: a certain pressure is applied to the objects to be welded through two electrodes, and at the same time, the spot welding current flows into the two welding materials through the electrodes in a very short time. Since the two welding materials have a large resistance at the contact surface, the heat generated by the contact resistance between the two welding materials under the action of the current melts them, thereby causing the two welding materials to partially melt and bond together.

[0038] However, the welding current doesn't entirely pass through the interface between the two welding materials. A portion of the current passes directly through the welding material in contact with the electrode to the other electrode. This current has little effect on the temperature rise at the interface between the two welding materials, and is known as ineffective current. If the ineffective current is too high, the two welding materials will have difficulty melting at the interface, making it difficult to form a reliable connection between the two materials, and this can easily lead to defects such as cold welds. Therefore, it is necessary to minimize the ineffective current.

[0039] Especially for copper, its conductivity is high, resulting in a large amount of ineffective current diversion of copper. In order to reduce the ineffective current of the electrical connector 4 during the welding process, in some embodiments, refer to Figure 2Each first welding portion 421 includes a first sub-welding portion 4211 and a second sub-welding portion 4212 that are spaced apart. The first sub-welding portion 4211 and the second sub-welding portion 4212 are both welded to the welding region 311, and a first shunt groove 4213 is provided between the first sub-welding portion 4211 and the second sub-welding portion 4212. When welding the first welding portion 421, one electrode of the resistance welding device is pressed against the first sub-welding portion 4211, and the other electrode is pressed against the second sub-welding portion 4212, so that a welding current loop is formed between the first sub-welding portion 4211, the welding region 311 on the circuit board 3, and the second sub-welding portion 4212. When power is applied to the electrodes, the first sub-welding portion 4211 and the second sub-welding portion 4212 are welded to the welding region 311. In this embodiment, a first shunt groove 4213 is provided between the first sub-welding portion 4211 and the second sub-welding portion 4212, so that the path H of the invalid current needs to extend from the first sub-welding portion 4211 to the second sub-welding portion 4212 along the periphery of the first shunt groove 4213, thereby extending the path H of the invalid current from the first sub-welding portion 4211 to the second sub-welding portion 4212, thereby achieving the effect of reducing the invalid current and further reducing the risk of cold welding.

[0040] For bracket 1 above, see Figure 3 The bracket 1 includes a first frame 11 and a second frame 12, which are detachably fixed. The first frame 11 and the second frame 12 jointly form a receiving groove 13, in which a portion of the battery cell assembly 2 is accommodated, and another portion of the battery cell assembly 2 protrudes from the receiving groove 13. The electrical connector 4 is welded and fixed to the portion of the battery cell assembly 2 protruding from the receiving groove 13.

[0041] In some embodiments, the first frame 11 and the second frame 12 are fixed by snapping together, and the snapping and detaching fixation between the first frame 11 and the second frame 12 is achieved by snapping together, which is simple and convenient to operate.

[0042] In some embodiments, see Figure 3 The bracket 1 is provided with a support portion 14 , and the second surface 32 of the circuit board 3 abuts against the support portion 14 . The support portion 14 can support the circuit board 3 , wherein the first surface 31 and the second surface 32 are opposite to each other.

[0043] In some embodiments, see Figure 2Along the first direction X, the projection of the welding area 311 at least partially overlaps with the projection of the support portion 14, where the first direction X is perpendicular to the first surface 31. With this arrangement, when welding the first welding portion 421, a certain amount of pressure needs to be applied to the first welding portion 421 to maintain contact with the welding area 311 on the circuit board 3. By ensuring that the projection of the welding area 311 at least partially overlaps with the projection of the support portion 14, when pressure is applied, the projection of the point of pressure acting on the first welding portion 421 in the first direction X is located within the support portion 14. This reduces the risk of deformation or warping of the circuit board 3 under the action of this pressure, thereby improving welding quality.

[0044] In some embodiments, see Figure 3 The bracket 1 is provided with multiple support portions 14 arranged in a rectangular array. The second surface 32 abuts against the multiple support portions 14, so that the multiple support portions 14 can jointly provide support for the circuit board 3, thereby improving the stability of the bracket 1 supporting the circuit board 3. In the first direction X, the projection of the welding area 311 at least partially overlaps with the projection of at least one support portion 14. This allows the at least one support portion 14 to withstand the pressure applied to the first welding portion 421 during welding between the first welding portion 421 and the welding area 311.

[0045] When there are multiple supporting parts 14 , some of the supporting parts 14 are disposed on the first frame 11 , and other supporting parts 14 are disposed on the second frame 12 .

[0046] In some embodiments, see Figure 1 The battery module 100 further includes a plurality of screws 5 , which pass through the circuit board 3 and are screwed to the bracket 1 , thereby fixing the circuit board 3 to the bracket 1 .

[0047] In some embodiments, see Figure 1 and Figure 2The electrical connector 4 includes a first connecting section 41 and a second connecting section 42. The first connecting section 41 and the second connecting section 42 are connected and perpendicular to each other, so that the electrical connector 4 is L-shaped. The first connecting section 41 is welded and fixed to the battery cell assembly 2. Each first welding portion 421 is arranged at the end of the second connecting section 42 away from the first connecting section 41. In other words, the second connecting section 42 is welded and fixed to the welding area 311. Among them, along the first direction X, the battery cell assembly 2, the support portion 14, the circuit board 3 and the second connecting section 42 are arranged in sequence. Since the first connecting section 41 is fixed to the battery cell assembly 2 and the second connecting section 42 is fixed to the welding area 311 on the circuit board 3, the electrical connector 4 can achieve an electrical connection between the circuit board 3 and the battery cell assembly 2 while also having a certain fixing effect on the circuit board 3 and the bracket 1, thereby improving the stability of the fixation between the circuit board 3 and the bracket 1.

[0048] In some embodiments, see Figure 2 The first connecting section 41 includes a second welding portion 411 , and the second welding portion 411 is used to be welded and fixed to the battery cell assembly 2 .

[0049] Specifically, the second welding portion 411 includes a third sub-welding portion 4111 and a fourth sub-welding portion 4112, which are jointly secured to the cell assembly 2 via resistance welding. The first connecting section 41 is further provided with a second shunt groove 412, at least partially located between the third sub-welding portion 4111 and the fourth sub-welding portion 4112. This increases the length of the path F for the ineffective current from the third sub-welding portion 4111 to the fourth sub-welding portion 4112, thereby reducing the ineffective current during resistance welding and improving welding quality.

[0050] In some embodiments, see Figure 6 The second shunt groove 412 is in the shape of a straight line, the third welding portion 4111 and the fourth sub-welding portion 4112 are respectively located on both sides of the second shunt groove 412, and along the length direction of the second shunt groove 412, the third sub-welding portion 4111 and the fourth sub-welding portion 4112 are located in the middle of the second shunt groove 412 to increase the length of the path F of the invalid current as much as possible.

[0051] In some embodiments, see Figure 7, the shape of the second diverter groove 412 is in the shape of an "I". Specifically, the second diverter groove 412 includes a vertical groove 4121, a first transverse groove 4122 and a second transverse groove 4123, and the first transverse groove 4122 and the second transverse groove 4123 are parallel to each other. One end of the first vertical groove 4121 is connected to the middle of the first transverse groove 4122, and the other end is connected to the middle of the second transverse groove 4122. The third sub-welding portion 4111 and the fourth sub-welding portion 4112 are both located in the middle of the first transverse groove 4122 and the second transverse groove 4123, and the third sub-welding portion 4111 and the fourth sub-welding portion 4112 are respectively located on both sides of the vertical groove 4121. In this way, compared with Figure 6 As for the structure in, the length of the invalid current path F can be further increased, thereby further reducing the invalid current and improving the welding quality.

[0052] In some embodiments, see Figure 8 The second diverter 412 includes a first trough body 4124, a second trough body 4125, a third trough body 4126, a first connecting trough 4127, and a second connecting trough 4128. The first trough body 4124, the second trough body 4125, and the third trough body 4126 are spaced apart in sequence and parallel to each other. One end of the first connecting trough 4127 is connected to one end of the first trough body 4124, the other end of the first connecting trough 4127 is connected to one end of the second trough body 4125, the end of the second trough body 4125 away from the first connecting trough 4127 is connected to one end of the second connecting trough 4128, and the other end of the second connecting trough 4128 is connected to the third trough body 4126, so that the shape of the second diverter 412 is generally S-shaped. The third sub-welding portion 4111 is located between the first trough 4124 and the second trough 4125, and the fourth sub-welding portion 4112 is located between the second trough 4125 and the third trough 4126. This arrangement can further increase the length of the invalid current path F and improve welding quality.

[0053] In some embodiments, the second diversion channel 412 has Figures 6 to 8 In addition to the structure in , it can also be other structures. For details, see Figure 9The second diverter 412 includes a first trough body 4124, a second trough body 4125, a third trough body 4126, and a first connecting trough 4127. The first, second, and third trough bodies 4124, 4125, 4126 are spaced apart and parallel to each other. One end of the first connecting trough 4127 communicates with one end of the first trough body 4124, and the other end of the first connecting trough 4127 communicates with one end of the third trough body 4126. The second trough body 4125 is connected to the center of the first connecting trough 4127, forming a "mountain" shape for the second diverter 412. The third sub-welding portion 4111 is disposed between the first trough body 4124 and the second trough body 4125, and the fourth sub-welding portion 4112 is disposed between the second trough body 4125 and the third trough body 4126. This increases the length of the path F for the ineffective current and improves welding quality.

[0054] Further, see Figure 10 The second shunt groove 412 further includes an extension groove 4129. The first extension groove 4129 is connected to an end of the second groove body 4125 away from the first connecting groove 4127, thereby further extending the length of the invalid current path F and improving the welding quality.

[0055] In some embodiments, see Figure 3 One of the bracket 1 and the circuit board 3 is provided with a positioning protrusion 15, and the other is provided with a positioning hole 33. The positioning protrusion 15 is inserted into the positioning hole 33 to achieve positioning between the circuit board 3 and the bracket 1.

[0056] Furthermore, the positioning protrusion 15 is provided on the bracket 1 , and the positioning hole 33 is provided on the circuit board 3 .

[0057] In some embodiments, see Figure 3 The battery cell assembly 2 includes a plurality of battery cells 21, each of which is disposed in the receiving groove 13. The plurality of battery cells 21 can be electrically connected in series, in parallel, or in a mixed manner. At least one battery cell 21 partially protrudes from the receiving groove 13, and the portion of the battery cell 21 protruding from the receiving groove 13 is welded to the first connecting section 41 to achieve electrical connection between the battery cell assembly 2 and the circuit board 3.

[0058] In some embodiments, see Figure 2 and Figure 3The above-mentioned first connecting section 41 is provided with multiple second welding parts 411 and multiple second shunt grooves 412. The second welding parts 411 are electrically connected to each other, a second welding part 411 is welded and fixed to a battery cell 21, and a second shunt groove 412 corresponds to a second welding part 412, so that the ineffective current of each second welding part 412 during the welding process can be weakened through the corresponding second shunt groove 412 to improve the welding quality. For the specific structure and position relationship of the second welding part 411 and the second shunt groove 412, please refer to the above embodiment and will not be repeated here.

[0059] In some embodiments, see Figure 3 The battery module 100 further includes a plurality of connecting pieces 6 , each connecting piece 6 being electrically connected to at least two different battery cells 21 , so that the plurality of battery cells 21 are connected in series, in parallel, or in a mixed state.

[0060] In some embodiments, see Figure 1 The multiple connecting pieces 6 are also welded and fixed to the circuit board 3 so that the multiple battery cells 21 can be connected in series, in parallel or in mixed connection through the multiple connecting pieces 6 and the circuit board 3.

[0061] In some embodiments, see Figure 3 Each connecting piece 6 is fixed to the battery core 21 by resistance welding to form an electrical connection.

[0062] In some embodiments, each connecting piece 6 is made of copper.

[0063] Further, see Figure 1 and Figure 3 Each connecting piece 6 is provided with at least one second welding portion 411 and at least one second shunt groove 412. The connecting piece 6 is welded and fixed to the battery cell 21 through the second welding portion 411, and a second shunt groove 412 corresponds to a second welding portion 412, so that the ineffective current of each second welding portion 412 during the welding process can be weakened through the corresponding second shunt groove 412 to improve the welding quality. For the specific structure and positional relationship of the second welding portion 411 and the second shunt groove 412, please refer to the above embodiment and will not be repeated here.

[0064] It is worth noting that the shapes of the multiple connecting pieces 6 can be the same or different, and their structures can be flexibly deformed according to the layout and connection relationship of the multiple battery cells 21. The shape of each connecting piece 6 is not limited here.

[0065] In some embodiments, see Figures 1 to 3The battery module 100 includes at least two electrical connectors 4, wherein at least one electrical connector 4 is electrically connected to the positive electrode of the battery cell assembly 2, and at least one electrical connector 4 is electrically connected to the negative electrode of the battery cell assembly 2. The first surface 31 of the circuit board 3 is provided with at least two welding areas 311, each welding area 311 is spaced apart from each other, and an electrical connector 4 is welded and fixed to a welding area 311, thereby achieving electrical connection between the battery cell assembly 2 and the circuit board 3. In this embodiment, by connecting the positive and negative electrodes of the battery cell assembly 2 to the circuit board 3 through at least one electrical connector 4, the battery cell assembly 2 can supply power to the outside world through the circuit board 3, making it convenient for the circuit board 3 to control the current, voltage, etc. of the power supplied by the battery cell assembly 2 to the outside world.

[0066] It is worth noting that each electrical connector 4 is provided with at least two first welding portions 421, and there is a partition groove 422 between each two adjacent first welding portions 421. Regarding the specific position and function of the first welding portion 421 and the partition groove 422, please refer to the above embodiment and will not be elaborated here.

[0067] In an embodiment of the present utility model, the battery cell assembly 2 and the circuit board 3 are arranged on the bracket 1, the welding area 311 is arranged on the first surface 31 of the circuit board 3, one end of the electrical connector 4 is electrically connected to the battery cell assembly 2, and at least two spaced-apart first welding portions 421 are arranged at the other end of the electrical connector 4. Each first welding portion 421 is welded and fixed to the welding area 311, thereby realizing the electrical connection between the battery cell assembly 2 and the circuit board 3. A partition groove 422 is provided between each two adjacent first welding portions 421, thereby reducing the tensile stress between the first welding portions 421, thereby reducing the risk of the first welding portion 421 being detached from the welding area 311, and improving the connection strength between the electrical connector 4 and the circuit board 3.

[0068] The above description is merely an 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 description 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: include: Bracket; A battery cell assembly is arranged on the bracket; A circuit board is arranged on the bracket, and a first surface of the circuit board is provided with a welding area; An electrical connector has one end electrically connected to the battery core assembly and the other end is provided with at least two first welding portions distributed at intervals, each of the first welding portions is welded and fixed to the welding area, and a partition groove is provided between each two adjacent first welding portions.

2. The battery module according to claim 1, wherein: The first welding portion includes a first sub-welding portion and a second sub-welding portion that are spaced apart. The first sub-welding portion and the second sub-welding portion are both welded and fixed to the welding area, and a first shunt groove is provided between the first sub-welding portion and the second sub-welding portion.

3. The battery module according to claim 1, wherein: The bracket is provided with a supporting portion, the second surface of the circuit board abuts against the supporting portion, the first surface and the second surface are opposite, along a first direction, the projection of the welding area at least partially overlaps with the projection of the supporting portion, and the first direction is perpendicular to the first surface.

4. The battery module according to claim 3, characterized in that: The bracket is provided with a plurality of support parts, and the plurality of support parts are distributed in an array. The second surface abuts against the plurality of support parts, wherein along the first direction, the projection of the welding area at least partially overlaps with the projection of at least one of the support parts.

5. The battery module according to claim 3, wherein: The electrical connector includes a first connecting section and a second connecting section. The first connecting section is welded and fixed to the battery cell assembly. Each of the first welding portions is arranged at an end of the second connecting section away from the first connecting section. Along the first direction, the battery cell assembly, the supporting portion, the circuit board and the second connecting section are arranged in sequence.

6. The battery module according to claim 5, characterized in that: The first connecting section includes at least one second welding portion, the second welding portion includes a third sub-welding portion and a fourth sub-welding portion, and the first connecting section is also provided with a second shunt groove, at least part of the second shunt groove is located between the third sub-welding portion and the fourth sub-welding portion, and the third sub-welding portion and the fourth sub-welding portion are both used to be welded and fixed to the battery cell assembly.

7. The battery module according to claim 6, characterized in that: The second diverter trough includes a first trough body, a second trough body, a third trough body, a first connecting trough and a second connecting trough, wherein the first trough body, the second trough body and the third trough body are sequentially spaced apart, the third sub-welding portion is located between the first trough body and the second trough body, and the fourth sub-welding portion is located between the second trough body and the third trough body; One end of the first connecting groove is connected to one end of the first groove body, and the other end is connected to one end of the second groove body. An end of the second groove body away from the first connecting groove is connected to one end of the second connecting groove, and the other end of the second connecting groove is connected to the third groove body.

8. The battery module according to claim 1, wherein: The bracket includes a first frame and a second frame, the first frame and the second frame jointly form a receiving groove, part of the battery cell assembly is accommodated in the receiving groove, one end of the electrical connector is welded and fixed to the part of the battery cell assembly protruding from the receiving groove, wherein the first frame and the second frame are detachably fixed.

9. The battery module according to claim 8, characterized in that: The battery module further includes a plurality of connecting pieces; The battery cell assembly includes a plurality of battery cells, and the plurality of battery cells are all arranged in the accommodating groove. The plurality of battery cells are electrically connected through a plurality of connecting pieces, and the electrical connector is electrically connected to at least one of the battery cells.

10. The battery module according to any one of claims 1 to 9, characterized in that: The battery module includes at least two electrical connectors, at least one of which is electrically connected to the positive electrode of the battery cell assembly, and at least one of which is electrically connected to the negative electrode of the battery cell assembly; At least two welding areas are provided on the first surface of the circuit board. The at least two welding areas are spaced apart from each other. An electrical connector is fixed to one welding area by welding.

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