A battery module

Abstract

The utility model relates to battery technical field discloses a kind of battery module, it includes: battery cell, the battery cell is equipped with multiple, each the battery cell is with pole; Insulating plate, the insulating plate is set on multiple battery cell, and with the surface of battery cell abuts, and multiple positioning hole that the insulating plate is equipped with along the axial penetration of battery cell itself, the positioning hole with the pole one-to-one correspondence;Busbar structure, the busbar structure is set on the side of insulating plate away from battery cell, and with multiple conductive part extending towards the direction of insulating plate, the conductive part with the positioning hole one-to-one correspondence, and through the positioning hole with the pole abuts, and the extension length of the conductive part is greater than the depth of the positioning hole, the busbar structure with longitudinal gap between insulating plate.The utility model has the beneficial effect in that the reliability of busbar and battery cell connection and the effectiveness of welding can be improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module. Background Technology

[0002] With the rapid development of new energy technologies, battery modules, as core components of key equipment such as electric vehicles and energy storage systems, are of paramount importance in terms of performance, safety, and reliability. In a battery module, multiple cells are typically electrically connected via busbars to meet the demands of different voltage and current outputs. To ensure the stability of the electrical connections and the compactness of the structure, positioning plates are often used to fix the cells, and busbars are connected to the terminals of the cells to achieve current transmission and distribution.

[0003] In existing technologies, busbars are mostly connected to the battery cell terminals by welding. In this type of structure, the positioning plate usually has through holes corresponding to the positions of the battery cell terminals, while the busbar has a downwardly extending conductive part. During assembly, the conductive part of the busbar passes through the through holes of the positioning plate and is welded to the battery cell terminals. Although the structural design of using a positioning plate in conjunction with the busbar improves assembly accuracy and mechanical stability to some extent, several technical challenges remain. First, the positioning plate is usually made of engineering plastic to achieve electrical insulation and weight reduction. However, plastic has a high coefficient of thermal expansion, and when the temperature rises, the positioning plate is prone to thermal deformation, with the central area potentially warping or bulging upwards. This causes the position of the through holes on the positioning plate to rise accordingly, preventing the conductive part of the busbar from effectively contacting the battery cell terminals, resulting in poor contact or even open circuits, seriously affecting the safety and performance of the module. Second, dimensional tolerances are unavoidable in the manufacturing process of each component. These tolerances accumulate during assembly, which may cause some conductive parts of the busbar to fail to make sufficient contact with the terminals, thus affecting the effectiveness of the welding. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a battery module that can improve the reliability of the connection between the bus and the cell and the welding effectiveness.

[0005] The technical solution adopted by this utility model to solve its technical problem is to provide a battery module, comprising:

[0006] The battery cell is provided in multiple forms, and each battery cell has a terminal post;

[0007] An insulating plate is attached to multiple battery cells and abuts against the surface of the battery cells. The insulating plate is provided with multiple positioning holes that penetrate the battery cells along their axial direction. Each positioning hole corresponds to a terminal post.

[0008] A bus structure is provided on the side of the insulating plate away from the battery cell, and has a plurality of conductive parts extending toward the insulating plate. Each conductive part corresponds to a positioning hole and passes through the positioning hole to abut against the electrode post. The extension length of the conductive part is greater than the depth of the positioning hole. There is a longitudinal gap between the bus structure and the insulating plate.

[0009] In one of the battery modules described above, the conductive part extends toward the terminal post and forms a surface contact with the terminal post. The diameter of the conductive part is smaller than the inner diameter of the positioning hole, and it has a welding hole that penetrates itself along the axial direction of the battery cell.

[0010] In one of the battery modules described above, the conductive part has a cavity, one end of which is connected to the outside, and the outer wall of the other end abuts against the electrode post, and the welding hole is located at the geometric center of the cavity.

[0011] In the aforementioned battery module, the terminals include positive and negative terminals respectively disposed at both ends of the battery cell, the insulating plate is provided in two sets and is respectively secured at both ends of the battery cell, the bus structure includes multiple separately disposed busbars, and each busbar includes at least two conductive parts corresponding one-to-one with the battery cell.

[0012] In one of the battery modules described above, each busbar or part of the busbar is provided with a notch, the notch penetrates the busbar along the axial direction of the cell, and the notch is located on the connection segment between two adjacent conductive parts.

[0013] In one of the battery modules described above, the busbar is H-shaped or straight, and when the busbar is H-shaped, it has four conductive portions that correspond one-to-one with the terminals, and two notches facing opposite directions.

[0014] In one of the battery modules described above, the insulating plate is provided with at least one first positioning post on the side away from the battery cell. The first positioning post extends from the surface of the insulating plate away from the battery cell. The busbar structure is provided with at least one first through hole that penetrates itself. The first through hole is sleeved on the first positioning post, and the diameter of the first through hole is adapted to the diameter of the first positioning post.

[0015] In the aforementioned battery module, a flexible circuit board and a nickel sheet are disposed on the side of the insulating plate away from the battery cell. The flexible circuit board is electrically connected to the bus structure through the nickel sheet. The insulating plate is also provided with at least one second positioning post extending from the surface of the insulating plate away from the battery cell. The flexible circuit board is provided with a second through hole that penetrates itself. The second through hole is sleeved on the second positioning post, and the diameter of the second through hole is adapted to the diameter of the second positioning post.

[0016] In the aforementioned battery module, each of the battery cells is provided with a vent valve, and the vent valve has a vent port at its center. The insulating plate is provided with a plurality of vent holes corresponding one-to-one with the vent ports, and the vent holes penetrate the insulating plate along the axial direction of the battery cell.

[0017] In one of the battery modules described above, the insulating plate is provided with a plurality of annular guide grooves corresponding one-to-one with the explosion vent holes on the side facing the battery cell. The annular guide grooves are arranged circumferentially along the positioning holes and communicate with the explosion vent holes, and the explosion vent holes are directly opposite the annular guide grooves.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. In this invention, by providing a conductive portion with an extension length greater than the depth of the positioning hole on the busbar structure, and forming a longitudinal gap between the busbar structure and the insulating plate, an adaptive floating connection structure without additional elastic elements is formed between the busbar structure and the battery cell before welding. This design can effectively absorb the cumulative errors caused by battery cell height tolerance, thermal expansion deformation of the insulating plate, and assembly deviations, ensuring that the conductive portion maintains stable contact with the terminal under various operating conditions. This avoids problems such as incomplete welding, increased contact resistance, or even open circuits caused by loose or detached connections, significantly improving the reliability, stability, and long-term durability of the connection.

[0020] 2. In this utility model, the conductive part is provided with a cavity, one end of which communicates with the outside, and the outer wall of the other end abuts against the electrode post, with the welding hole located at the geometric center of the cavity. This design enables the conductive part to have a certain axial elastic deformation capability, effectively absorbing the pressing force and thermal stress during assembly, avoiding damage to the electrode post or loosening of the connection due to rigid contact; at the same time, the centrally located welding hole can serve as a visual positioning reference, achieving high-precision alignment of laser or resistance welding, ensuring consistent welding position, and improving connection reliability and automated production efficiency.

[0021] 3. In this invention, an annular guide groove is provided on the side of the insulating plate facing the battery cell. The annular guide groove is arranged circumferentially along the positioning hole and communicates with the explosion vent hole, with the explosion vent hole directly opposite the annular guide groove. This design allows for the formation of an effective gas flow channel through the annular guide groove even when there is an assembly misalignment between the explosion vent hole and the explosion vent hole. This guides the high-temperature gas flow and debris ejected during thermal runaway to the direction of the explosion vent hole for directional discharge, avoiding lateral jetting that could cause thermal shock to adjacent battery cells or electronic components. This significantly improves the safety and fault tolerance of the battery module under extreme operating conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a battery module according to the present invention.

[0023] Figure 2 This is an exploded view of a battery module according to the present invention.

[0024] Figure 3 This is a cross-sectional view of a battery module according to the present invention.

[0025] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0026] 100. Battery cell; 110. Positive terminal; 120. Negative terminal; 130. Explosion relief valve; 131. Explosion relief port; 200. Insulating plate; 210. Positioning hole; 220. First positioning post; 230. Second positioning post; 240. Explosion relief hole; 250. Annular guide groove; 300. Busbar; 301. Notch; 310. Conductive part; 311. Cavity; 320. Welding hole; 330. First through hole; 340. Bending part; 400. Longitudinal gap; 500. Flexible circuit board; 510. Second through hole; 600. Nickel sheet. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0032] like Figures 1 to 3 As shown, in this embodiment, a battery module includes:

[0033] The battery cell 100 is provided in multiple forms, and each battery cell 100 has a terminal post.

[0034] An insulating plate 200 is attached to multiple battery cells 100 and abuts against the surface of the battery cells 100. The insulating plate 200 is provided with multiple positioning holes 210 that penetrate through itself along the axial direction of the battery cells 100. Each positioning hole 210 corresponds to a terminal post.

[0035] The bus structure is located on the side of the insulating plate 200 away from the battery cell 100 and has multiple conductive parts 310 extending towards the insulating plate 200. Each conductive part 310 corresponds to a positioning hole 210 and passes through the positioning hole 210 to abut against the terminal. The extension length of the conductive part 310 is greater than the depth of the positioning hole 210. There is a longitudinal gap 400 between the bus structure and the insulating plate 200. This design enables the bus structure and the battery cell 100 to form an adaptive floating connection structure without additional elastic elements before welding. It can effectively absorb the cumulative errors caused by the height tolerance of the battery cell 100, the thermal expansion deformation of the insulating plate 200, and assembly deviations. It ensures that the conductive parts 310 always maintain stable contact with the terminal under various operating conditions, avoiding problems such as poor soldering, increased contact resistance, or even open circuits caused by loosening or detachment of the connection. This significantly improves the reliability, stability, and long-term durability of the connection between the two.

[0036] Specifically, such as Figures 1 to 3 As shown, in this embodiment, the battery module is used to form the basic functional unit of a power battery pack. The battery module includes multiple battery cells 100, an insulating plate 200 disposed on the battery cells 100, a busbar structure disposed on the side of the insulating plate 200 opposite to the battery cells 100, a flexible circuit board 500, and a nickel sheet 600.

[0037] Furthermore, the battery cell 100 can be either cylindrical or prismatic. When it is a cylindrical cell, each cell 100 has a positive terminal 110 and a negative terminal 120 at both ends, and each end has a corresponding insulating plate 200, meaning there are two sets of insulating plates 200. This design ensures electrical isolation between the two ends of the cell 100 and provides good mechanical support. When the cell 100 is a prismatic cell, since the positive terminal 110 and the negative terminal 120 are located in the same plane, only one set of insulating plates 200 is needed to limit and isolate the entire cell 100 array. This method simplifies the structural design, reduces the number of components, and improves assembly efficiency.

[0038] Furthermore, in this embodiment, the battery cell 100 is a cylindrical battery cell 100, and there are 32 of them arranged in a matrix. Each battery cell 100 has a positive terminal 110 and a negative terminal 120 at both ends, which are used to realize the series and parallel connection between the battery cells 100. In particular, the positive terminal 110 is designed as a planar structure, while the negative terminal 120 is a boss structure, so as to facilitate differentiation and installation. This structure not only helps to improve the accuracy of the connection between the battery cells 100, but also facilitates rapid identification and positioning on automated production lines.

[0039] Furthermore, the 32 battery cells 100 are electrically connected via a bus structure using a parallel-then-series connection method. Specifically, every two battery cells 100 are connected in parallel to form 16 parallel units, and then these 16 parallel units are connected in series. This design effectively increases the voltage and current output capability of the battery module.

[0040] Furthermore, each battery cell 100 is equipped with a pressure relief valve 130, and the pressure relief valve 130 has a pressure relief port 131 at its center. This pressure relief port 131 serves as the initial rupture point for the release of internal pressure in the battery cell 100. When the battery cell 100 experiences thermal runaway and the internal gas pressure abnormally rises to a set threshold, it can preferentially rupture and open to release high-pressure gas and high-temperature ejected material in a timely manner, preventing a violent explosion of the battery cell 100 casing.

[0041] Furthermore, the explosion vent 131 is directly opposite the annular guide groove 250 on the insulating plate 200, that is, the axis of the explosion vent 131 corresponds to the central area of ​​the annular guide groove 250, ensuring that the gas flow, flame and solid particles ejected after the explosion vent is opened can enter the annular guide groove 250 as soon as possible and be discharged through the explosion vent 240.

[0042] In this embodiment, there are two sets of insulating plates 200. The two sets have the same structure and are rectangular. They are respectively clamped at both ends of multiple battery cells 100 and tightly abut against the surface of the battery cells 100, which serves to limit mechanical positioning, align the battery cells 100 and provide electrical insulation.

[0043] Furthermore, the insulation board 200 is made of high-temperature resistant and high-insulation-strength engineering plastics, such as polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS), which has good dimensional stability and resistance to heat deformation.

[0044] Furthermore, the insulating plate 200 is provided with a plurality of circular positioning holes 210 that penetrate through itself along the axial direction of the battery cell 100. The number of these positioning holes 210 corresponds one-to-one with the positive terminal 110 or negative terminal 120 of each battery cell 100, and their distribution matches the array of battery cells 100. These positioning holes 210 are used to guide the conductive parts 310 on the busbar structure to be accurately inserted and to achieve alignment and contact with the corresponding positive terminal 110 or negative terminal 120.

[0045] Furthermore, the inner diameter of the positioning hole 210 is slightly larger than the outer diameter of the conductive part 310, and a suitable radial gap is provided between them. This design not only guides the conductive part 310 to be smoothly inserted during assembly, effectively avoiding misalignment or jamming, but also significantly reduces the frictional resistance between the conductive part 310 and the insulating plate 200. Moreover, when the insulating plate 200 undergoes thermal expansion or local warping deformation due to temperature changes, the radial gap provides the necessary space for the conductive part 310 to move smoothly up and down in the axial direction, thereby accommodating the deformation displacement of the insulating plate 200.

[0046] Furthermore, the insulating plate 200 has at least one first positioning post 220 on the side facing away from the battery cell 100. Preferably, there are multiple first positioning posts 220. Each first positioning post 220 has a columnar protrusion structure, extending vertically from the surface of the insulating plate 200 away from the battery cell 100, and forming a plug-in fit with the first through hole 330 on the busbar structure. During assembly, the first through hole 330 is fitted onto the outer periphery of the first positioning post 220 from top to bottom, realizing the alignment connection between the two. This design can achieve precise positioning of the busbar 300 in the X and Y planes, ensuring that each conductive part 310 on the busbar 300 can be accurately aligned with the corresponding positioning hole 210 on the insulating plate 200 and the terminal position of the battery cell 100 below, avoiding problems such as misalignment, bias, or inability to contact the terminal due to offset of the conductive parts 310.

[0047] Furthermore, the insulating plate 200 is also provided with at least one second positioning post 230. Preferably, there are multiple second positioning posts 230. Each second positioning post 230 has a columnar protrusion structure, extending vertically from the surface of the insulating plate 200 away from the battery cell 100, and forming an insertion fit with the second through hole 510 on the flexible circuit board 500. During assembly, the second through hole 510 is fitted from top to bottom onto the outer periphery of the second positioning post 230, realizing the precise positioning and reliable fixation of the flexible circuit board 500 on the insulating plate 200.

[0048] Preferably, the first positioning post 220 and the second positioning post 230 are integrally injection molded with the insulating plate 200, which has good structural strength and positional accuracy.

[0049] To achieve directional emission of gas after the battery cell 100 explodes, in this embodiment, the insulating plate 200 is provided with multiple explosion vent holes 240 corresponding one-to-one with the explosion vent ports 131 of the explosion vent valve 130. These explosion vent holes 240 are circular and penetrate the insulating plate 200 along the axial direction of the battery cell 100. They are used to directly guide the rapidly accumulating high-temperature, high-pressure gas and ejected material inside the battery cell 100 to the outside of the module or a pre-designated exhaust channel when thermal runaway occurs, thereby effectively releasing pressure and preventing serious safety accidents such as shell rupture and chain thermal runaway caused by continuous pressure increases.

[0050] Furthermore, to enhance the fault tolerance of the pressure relief system and prevent poor pressure relief due to assembly deviations or structural offsets causing the explosion relief port 131 and explosion relief hole 240 to not be fully aligned, in this embodiment, a plurality of annular guide grooves 250 corresponding one-to-one with the explosion relief holes 240 are provided on the side of the insulating plate 200 facing the battery cell 100. The annular guide grooves 250 are arranged circumferentially along the positioning hole 210 and communicate with the explosion relief holes 240, with their inner ring area directly facing the explosion relief port 131 of the battery cell 100.

[0051] When thermal runaway occurs in cell 100, even if there is a misalignment between the vent 131 and the vent hole 240, the ejected high-temperature gas flow and debris first enter the annular guide channel 250, and then converge and flow into the vent hole 240 under the guidance of the guide channel, achieving directional and orderly discharge. This design significantly improves the reliability and assembly tolerance adaptability of the pressure relief system, ensuring effective safety protection under various operating conditions.

[0052] In this embodiment, the bus structure consists of multiple separately arranged busbars 300, each busbar 300 including at least two conductive portions 310 corresponding one-to-one with the battery cells 100. The conductive portion 310 extends vertically from the surface of the busbar 300 toward the insulating plate 200, and has a columnar or protruding structure. Its arrangement matches the array layout of the battery cell 100 terminals and corresponds one-to-one with the positioning holes 210 on the insulating plate 200, ensuring accurate passage through the positioning holes 210 and reliable contact with the terminals of the battery cell 100 below during assembly. By adopting a separate busbar 300 design, the traditional integrated large-size busbar 300 is decomposed into multiple miniaturized, modular independent busbar 300 units. Each busbar 300 connects only two or more adjacent battery cells 100, forming a local series-parallel circuit.

[0053] Furthermore, the bus structure has a longitudinal gap 400 between itself and the insulating plate 200, and the extension length of the conductive part 310 is greater than the depth of the positioning hole 210. This longitudinal gap 400 means that the bus body 300 and the surface of the insulating plate 200 below (or above) it are not directly attached in the axial direction (Z direction) of the cell 100, but rather a certain height of clearance is reserved. This longitudinal gap 400, together with the redundant length of the conductive part 310, forms a "floating" electrical connection structure. When the bus 300 is assembled in place, each conductive part 310 passes through the positioning hole 210 on the insulating plate 200 and abuts against the end face of the cell 100 pole, while the bus body 300 remains in a non-contact state with the insulating plate 200, thus allowing the bus 300 a certain amount of free movement in the Z direction. When the insulating plate 200 deforms and rises, the busbar 300 can float downward through the longitudinal gap 400. The conductive part 310 continues to maintain contact with the pole by using its extension section that exceeds the depth of the positioning hole 210. This not only avoids poor contact and thus prevents cold solder joints, but also effectively prevents connection interruption caused by structural deformation.

[0054] Preferably, the longitudinal gap is 0.9mm-1.1mm.

[0055] Furthermore, the conductive part 310 extends towards the electrode post and forms a surface contact with the electrode post. Compared with point contact or line contact, this surface contact method significantly increases the conductive area, effectively reduces contact resistance, and improves current transmission efficiency and connection stability.

[0056] Furthermore, the diameter of the conductive part 310 is smaller than the inner diameter of the positioning hole 210, and a suitable radial gap is provided between them. This design not only facilitates the smooth insertion of the conductive part 310 into the positioning hole 210 during assembly, avoiding damage to the insulating plate 200 due to friction or misalignment, but also allows for a certain degree of lateral position deviation compensation, improving assembly fault tolerance.

[0057] Furthermore, the conductive part 310 is provided with a circular welding hole 320 that extends through itself along the axial direction of the cell 100. This welding hole 320 communicates with the contact area between the conductive part 310 and the electrode post. In subsequent connection processes, laser penetration welding or resistance welding can be performed through this welding hole 320 to achieve a permanent fixed connection between the conductive part 310 and the electrode post.

[0058] Furthermore, the conductive part 310 has a recessed cavity 311 formed from top to bottom or bottom to top towards the electrode post. This cavity 311 is a non-through structure with one end open and the other end closed. The open end communicates with the external environment, and the outer wall surface of the closed end serves as the contact area of ​​the conductive part 310, abutting against the electrode post end face of the battery cell 100 to form a stable and reliable surface contact. This design enables the conductive part 310 to have a certain elastic deformation capability, allowing it to withstand compressive displacement within a preset range during assembly. It effectively absorbs axial stress caused by the crimping process, the height tolerance of the battery cell 100, or thermal expansion, avoiding overpressure damage to the electrode post. At the same time, it prevents contact loosening or cracking of the insulation plate 200 due to rigid connection, significantly improving the reliability of the connection and structural safety.

[0059] Furthermore, the welding hole 320 is located at the geometric center of the closed end of the cavity 311, penetrates the conductive part 310 body along the axial direction of the cell 100, and communicates with the internal space of the cavity 311. This design makes the welding hole 320 a clear and easily identifiable visual positioning reference, enabling high-precision alignment of laser or resistance welding, ensuring consistent welding positions, and improving connection reliability and automated production efficiency.

[0060] Furthermore, each busbar 300 or part of the busbar 300 is provided with a rectangular notch 301, which penetrates the busbar 300 along the axial direction of the cell 100 and is located on the connection section between two adjacent conductive parts 310. This design forms a local weak area or stress relief groove on the metal body of the busbar 300. When the busbar 300 is subjected to assembly stress, thermal expansion stress, or external vibration load, moderate elastic deformation can occur in the area of ​​the notch 301, thereby effectively releasing the internal accumulated mechanical stress and preventing problems such as fatigue cracking, loose connection, or solder joint detachment caused by rigid structure. This significantly improves the structural stability and service life of the busbar 300 under dynamic operating conditions.

[0061] Furthermore, the shape of each bus 300 can be flexibly designed according to the arrangement of the cells 100 and the electrical connection requirements, specifically in an H-shape or a straight line. Buses 300 of different shapes are suitable for different series and parallel topologies, exhibiting good design adaptability and modularity.

[0062] In this embodiment, the multiple busbars 300 located on the insulating plate 200 at one end of the battery cell 100 are all H-shaped, while the multiple busbars 300 located on the insulating plate 200 at the other end of the battery cell 100 are arranged in a combination of H-shape and straight-line shape according to the circuit connection requirements, so as to realize complex series and parallel connection paths. It should be noted that, in order to improve the stability of the connection between the busbar structure located on the base of the battery cell 100 and the insulating plate 200, some of the busbars 300 located at the edge of the insulating plate 200 are provided with bending portions 340. The bending portions 340 are perpendicularly connected to the body of the busbar 300 and are connected to the side wall of the insulating plate 200 by fasteners.

[0063] Furthermore, when the busbar 300 is H-shaped, its structure includes two parallel conductive arms, each with two conductive portions 310 corresponding one-to-one with the terminals of the battery cell 100. The two conductive arms are connected by an intermediate connecting section, and a notch 301 facing opposite directions is provided on both sides of the intermediate connecting section. That is, one notch 301 opens towards the left conductive arm, and the other notch 301 opens towards the right conductive arm, forming a symmetrically distributed double-notch 301 structure. Since the two notches 301 face opposite directions, structural flexibility and deformation space can be provided in both directions, allowing the H-shaped busbar 300 to achieve more balanced stress release through the coordinated deformation of the two notches 301 when subjected to uneven thermal expansion or assembly pressure, thus avoiding structural distortion or local fracture.

[0064] Furthermore, each busbar 300 is provided with at least one through-hole 330. The first through-hole 330 is circular and fits around the outer periphery of the first positioning post 220 to achieve a plug-in fit between the busbar 300 and the insulating plate 200. The diameter of the first through-hole 330 is adapted to the diameter of the first positioning post 220; preferably, the diameter of the first through-hole 330 is slightly larger than the diameter of the first positioning post 220.

[0065] Furthermore, the busbar 300 is an aluminum busbar or a copper busbar, preferably an aluminum busbar.

[0066] In this embodiment, the flexible circuit board 500 and the nickel sheet 600 are disposed on the side of the insulating plate 200 away from the battery cell 100, and are integrated with the bus structure on the same assembly plane to form a compact and efficient electrical and signal connection system.

[0067] Furthermore, the flexible printed circuit board 500 (FPC) is used to collect and transmit key parameters such as voltage and temperature of each cell 100 in the battery module. It has a second through hole 510 that penetrates through itself. The second through hole 510 is circular and passes through the flexible printed circuit board 500 along the axial direction of the cell 100. Its position corresponds one-to-one with the second positioning post 230 set on the insulating plate 200. During assembly, it is fitted onto the second positioning post 230 to achieve precise positioning and stable fixation of the flexible printed circuit board 500.

[0068] Furthermore, the diameter of the second through hole 510 is adapted to the diameter of the second positioning post 230. Preferably, the diameter of the second through hole 510 is slightly larger than the diameter of the second positioning post 230, forming a clearance fit between them.

[0069] Furthermore, the flexible circuit board 500 and the bus structure are electrically connected via a nickel strip 600. This nickel strip 600 serves as a conductive connector; one end is fixedly connected to the signal pins or reserved connection points on the bus 300 via welding (such as laser welding or resistance welding) or crimping, while the other end is welded or plugged into the corresponding pads or terminal areas on the flexible circuit board 500, thereby enabling the transmission of electrical signals.

Claims

1. A battery module, characterized in that, include: A battery cell (100) is provided, and each battery cell (100) has a terminal post; An insulating plate (200) is attached to a plurality of the battery cells (100) and abuts against the surface of the battery cells (100). The insulating plate (200) is provided with a plurality of positioning holes (210) that penetrate itself along the axial direction of the battery cells (100). The positioning holes (210) correspond one-to-one with the pole posts. A bus structure is provided on the side of the insulating plate (200) away from the battery cell (100) and has a plurality of conductive parts (310) extending toward the insulating plate (200). The conductive parts (310) correspond one-to-one with the positioning holes (210) and pass through the positioning holes (210) to abut against the pole post. The extension length of the conductive parts (310) is greater than the depth of the positioning holes (210). There is a longitudinal gap (400) between the bus structure and the insulating plate (200).

2. A battery module according to claim 1, characterized in that, The conductive part (310) extends toward the pole post and forms a surface contact with the pole post. The diameter of the conductive part (310) is smaller than the inner diameter of the positioning hole (210), and it has a welding hole (320) that penetrates itself along the axial direction of the cell (100).

3. A battery module according to claim 2, characterized in that, The conductive part (310) is provided with a cavity (311), one end of the cavity (311) is connected to the outside, the outer wall of the other end abuts against the pole post, and the welding hole (320) is located at the geometric center of the cavity (311).

4. A battery module according to claim 1, characterized in that, The terminals include a positive terminal (110) and a negative terminal (120) respectively disposed at both ends of the battery cell (100). The insulating plate (200) is provided in two sets, respectively clamped at both ends of the battery cell (100). The bus structure includes multiple separately disposed busbars (300), and each busbar (300) includes at least two conductive parts (310) corresponding one-to-one with the battery cell (100).

5. A battery module according to claim 4, characterized in that, Each of the busbars (300) or a portion of the busbars (300) is provided with a notch (301) that penetrates the busbar (300) along the axial direction of the cell (100) and is located on the connection segment between two adjacent conductive parts (310).

6. A battery module according to claim 5, characterized in that, The busbar (300) is H-shaped or straight, and when the busbar (300) is H-shaped, it has four conductive parts (310) that correspond one-to-one with the poles, and two notches (301) facing opposite directions.

7. A battery module according to claim 1, characterized in that, The insulating plate (200) has at least one first positioning post (220) on the side away from the battery cell (100). The first positioning post (220) extends from the surface of the insulating plate (200) in a direction away from the battery cell (100). The busbar structure has at least one through hole (330) that penetrates itself. The first through hole (330) is sleeved on the first positioning post (220), and the diameter of the first through hole (330) is adapted to the diameter of the first positioning post (220).

8. A battery module according to claim 1, characterized in that, The device includes a flexible circuit board (500) and a nickel sheet (600) disposed on the side of the insulating plate (200) away from the battery cell (100). The flexible circuit board (500) is electrically connected to the bus structure through the nickel sheet (600). The insulating plate (200) is also provided with at least one second positioning post (230) extending from the surface of the insulating plate (200) away from the battery cell (100). The flexible circuit board (500) is provided with a second through hole (510) that penetrates itself. The second through hole (510) is sleeved on the second positioning post (230), and the diameter of the second through hole (510) is adapted to the diameter of the second positioning post (230).

9. A battery module according to claim 1, characterized in that, Each of the battery cells (100) is provided with a vent valve (130), and the vent valve (130) has a vent port (131) at its center. The insulating plate (200) is provided with a plurality of vent holes (240) corresponding one-to-one with the vent ports (131). The vent holes (240) penetrate the insulating plate (200) along the axial direction of the battery cell (100).

10. A battery module according to claim 9, characterized in that, The insulating plate (200) has a plurality of annular guide grooves (250) on the side facing the battery cell (100) that correspond one-to-one with the explosion relief hole (240). The annular guide grooves (250) are arranged circumferentially along the positioning hole (210) and communicate with the explosion relief hole (240), and the explosion relief port (131) is directly opposite the annular guide groove (250).

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