Battery module, battery pack, and electric device

Abstract

The application discloses a battery module, a battery pack and a power utilization device. The battery module comprises a battery cell, a gasket, a conductive plate, a circuit board and an insulating layer. The battery cell, the gasket, the conductive plate and the circuit board are sequentially connected, and the insulating layer covers the gasket and the conductive plate. The insulating layer comprises a glue coating area and a non-glue coating area. The glue coating area is connected with the gasket through glue, and the glue coating area covers the gasket. The non-glue coating area covers the conductive plate. The glue coating area only covers the gasket, and the non-glue coating area covers the conductive plate. The stability of the insulating layer in the normal use state is ensured, and the direct bonding of the glue to the conductive plate is avoided. When maintenance or detection is performed, tearing the insulating layer will not cause tearing damage to the conductive plate, and the maintenance difficulty and risk are significantly reduced. By reducing the damage to the conductive plate area during maintenance, the replacement and repair costs are reduced. In a high-voltage area, for example, near the circuit board, the high-voltage risk caused by tearing is avoided, and the operation safety is enhanced.

Description

Technical Field

[0001] This application relates to the field of energy storage battery technology, and in particular to a battery module, battery pack and electrical equipment. Background Technology

[0002] After the battery system's multiple cells are assembled, they are typically welded to the Battery Contact System (CCS). After laser welding of the contacts to the cells on the CCS assembly, one end of the nickel plate is attached to the contacts. The other end of the nickel plate is then glued to the flexible printed circuit board (FPC) using a negative temperature coefficient (NTC) adhesive applied to the nickel plate area, ensuring better sealing and bonding. Insulating material is then applied over the contacts and nickel plate. During product testing, this insulating material is often torn open to inspect the contacts and cell terminals due to potential faults. In this case, the nickel plate attached to the insulating layer in that area may tear off along with the insulating material, potentially affecting the entire CCS assembly and the battery system. Utility Model Content

[0003] This application provides a battery module, battery pack, and electrical device that are easy to test.

[0004] In a first aspect, this application provides a battery module, which includes a battery cell, a battery pad, a conductive plate, a circuit board and an insulating layer, wherein the battery cell, battery pad, conductive plate and circuit board are connected in sequence, and the insulating layer covers the battery pad and the conductive plate.

[0005] The insulating layer includes an adhesive-coated area and a non-adhesive-coated area. The adhesive-coated area is connected to the pad with glue and covers the pad, while the non-adhesive-coated area covers the conductive plate.

[0006] In some feasible implementations, the area of ​​the coating region projected along the thickness direction of the adhesive patch is larger than the area of ​​the adhesive patch itself.

[0007] In some feasible implementations, the area of ​​the non-coated region in the thickness direction of the conductive plate is larger than the area of ​​the conductive plate.

[0008] In some feasible implementations, the non-adhesive area includes a first non-adhesive area and a second non-adhesive area, with the adhesive area located between the first non-adhesive area and the second non-adhesive area.

[0009] In some feasible implementations, there are multiple battery cells, multiple battery pads, and multiple conductive plates. The multiple battery cells are arranged in sequence, and each pair of adjacent battery cells is electrically connected through a battery pad. The multiple battery pads correspond one-to-one with the multiple conductive plates. The glued area covers the multiple battery pads, and the non-glued area covers the multiple conductive plates.

[0010] In some feasible implementations, the area of ​​the coating region projected along the thickness directions of multiple patches is greater than the total area of ​​the multiple patches.

[0011] In some feasible implementations, the area of ​​the uncoated region projected along the thickness directions of multiple conductive plates is greater than the total area of ​​the multiple conductive plates.

[0012] In some feasible implementations, the insulation layer covers the terminals of multiple cells.

[0013] Secondly, this application provides a battery pack, which includes the battery module described in the first aspect.

[0014] Thirdly, this application provides an electrical device that includes the battery pack described in the second aspect.

[0015] The insulating layer covers the circuit board and the conductive plate. An adhesive-coated area and a non-adhesive-coated area are formed on the side of the insulating layer facing the circuit board and the conductive plate. The adhesive-coated area is connected to the circuit board with adhesive and covers the circuit board, while the non-adhesive-coated area covers the conductive plate. The adhesive-coated area only covers the circuit board, ensuring the stability of the insulating layer under normal use. The non-adhesive-coated area covers the conductive plate, avoiding direct adhesion of adhesive to the conductive plate. During maintenance, tearing the insulating layer will not cause tearing damage to the conductive plate, significantly reducing maintenance difficulty and risk. By reducing damage to the conductive plate area during maintenance, the cost of replacement and repair is reduced. In high-voltage areas, such as near circuit boards, the risk of high voltage due to tearing is avoided, enhancing operational safety. Furthermore, by setting a non-adhesive-coated area on the insulating layer, the adhesive area required to connect the insulating layer and the circuit board is reduced, thereby lowering production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0017] Figure 1 A perspective view of the battery module provided in this application;

[0018] Figure 2 A plan view of the battery module provided in this application;

[0019] Figure 3 for Figure 2 The diagram shows a battery module with the insulation layer removed.

[0020] Figure 4 for Figure 3 Enlarged view marked A;

[0021] Figure 5 A schematic diagram of the insulating layer provided in this application.

[0022] Attached image annotations:

[0023] 1000-Battery module, 100-Cell, 110-Terminal post, 200-Battery plate, 300-Conductive plate, 400-Circuit board, 500-Insulating layer, 510-Glue coating area, 520-Uncoated area, 521-First uncoated area, 522-Second uncoated area. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0025] Please see Figures 1 to 5 This application provides a battery module 1000, which includes a battery cell 100, a battery pad 200, a conductive plate 300, a circuit board 400, and an insulating layer 500. The battery cell 100, battery pad 200, conductive plate 300, and circuit board 400 are connected in sequence. The insulating layer 500 covers the battery pad 200 and the conductive plate 300. The insulating layer 500 includes an adhesive coating area 510 and a non-adhesive coating area 520. The adhesive coating area 510 is connected to the battery pad 200 by adhesive and covers the battery pad 200. The non-adhesive coating area 520 covers the conductive plate 300.

[0026] In some feasible implementations, the battery cell 100 is the basic unit of the battery module 1000, used for storing and releasing electrical energy. The battery cell 100 is connected to the electrode plate 200 via laser welding to form a stable electrical connection. The electrode plate 200 is the current output terminal of the battery cell 100 and can be used for connection between two battery cells 100; its material is typically aluminum or copper. The electrode plate 200 is connected to the circuit board 400 via a conductive plate 300. The conductive plate 300 is made of a metal material with good conductivity, such as a nickel sheet. One end of the conductive plate 300 is connected to the electrode plate 200 via laser welding, and the other end is fixed to the circuit board 400 with NTC adhesive. The circuit board 400 can be a sampling board or an FPC board, used to monitor key parameters such as voltage and temperature of the battery cell 100 and transmit the data to the battery management system.

[0027] The insulating layer 500 can be made of materials with electrical insulation properties, or materials that combine heat insulation, fire resistance, and insulation, such as polypropylene, polycarbonate, and polyester film. The insulating layer 500 covers the pad 200 and the conductive plate 300, ensuring electrical isolation between the pad 200 and the conductive plate 300 and other parts of the module. The side of the insulating layer 500 facing the pad 200 and the conductive plate 300 has an adhesive-coated area 510 and a non-adhesive-coated area 520. The adhesive-coated area 510 is bonded to the pad 200 with adhesive; the adhesive can be a removable adhesive for easy disassembly and maintenance of the insulating layer 500; the adhesive can also be a hot melt adhesive for rapid curing. The non-adhesive-coated area 520 covers the conductive plate 300 area but is not directly bonded to it.

[0028] The adhesive-coated area 510 covers only the electrode pad 200, ensuring the stability of the insulation layer 500 under normal use and facilitating localized maintenance. The non-adhesive-coated area 520 covers the conductive plate 300, preventing direct bonding of the conductive plate 300 with adhesive. During maintenance, tearing off the insulation layer 500 will not cause tearing damage to the conductive plate 300, such as the nickel sheet, significantly reducing maintenance difficulty and risk. By reducing damage to the conductive plate 300 area during maintenance, the cost of replacement and repair is reduced. In high-voltage areas, such as near the circuit board 400, the risk of high voltage due to tearing is avoided, enhancing operational safety. Furthermore, by setting the non-adhesive-coated area 520 on the insulation layer 500, the adhesive area required to connect the insulation layer 500 and the electrode pad 200 is reduced, thereby lowering production costs.

[0029] The projected area of ​​the adhesive coating area 510 along the thickness direction of the battery pack 200 is larger than the area of ​​the battery pack 200. In some feasible implementations, the thickness direction of the battery pack 200, which is also the height direction of the battery module 1000, is the Z-axis direction, the length direction of the battery module 1000 is the X-axis direction, and the width direction of the battery module 1000 is the Y-axis direction. Viewed from top to bottom along the Z-axis, the fact that the area of ​​the adhesive coating area 510 on the insulating layer 500 is larger than the area of ​​the battery pack 200 means that the outline of the adhesive coating area 510 completely covers the outline of the battery pack 200. This ensures that the adhesive coating area 510 of the insulating layer 500 can completely cover and bond with the battery pack 200, resulting in a stronger connection between the insulating layer 500 and the battery pack 200. This better resists various mechanical stresses during production, transportation, and use, ensuring the long-term structural stability of the battery module 1000.

[0030] The area of ​​the non-adhesive-coated area 520 in the thickness direction of the conductive plate 300 is larger than the area of ​​the conductive plate 300. The thickness direction of the circuit board 400, which is the height direction of the battery module 1000, is the Z-axis direction. Viewed from top to bottom in the Z-axis direction, the fact that the area of ​​the non-adhesive-coated area 520 on the insulating layer 500 is larger than the area of ​​the conductive plate 300 means that the outline of the non-adhesive-coated area 520 completely covers the outline of the conductive plate 300. When maintenance is required, the operator will attempt to peel off the insulating layer 500. Since there is no adhesive force between the non-adhesive-coated area 520 and the conductive plate 300, the peeling force is concentrated at the connection between the adhesive-coated area 510 and the tab 200. The peeling process will damage the adhesive layer of the adhesive-coated area 510, thereby peeling the insulating layer 500 off the tab 200 without tearing the conductive plate 300 below. The non-adhesive-coated area 520 has a larger area in the thickness direction of the conductive plate 300 than the conductive plate 300 itself. This ensures that during the peeling process, the edge of the non-adhesive-coated area 520 always surrounds the outline of the conductive plate 300. This provides sufficient operating space for the tools, and the peeling force does not act on the edge of the conductive plate 300, preventing tearing. This protects the current path between the conductive plate 300 and the circuit board 400 within the battery module 1000, ensuring the integrity and reliability of the electrical performance after repair. It also avoids collateral damage, significantly reducing after-sales maintenance costs and improving the product's economic efficiency and sustainability.

[0031] Please see Figure 5The non-adhesive-coated area 520 includes a first non-adhesive-coated area 521 and a second non-adhesive-coated area 522, with an adhesive-coated area 510 located between the first non-adhesive-coated area 521 and the second non-adhesive-coated area 522. The location of the adhesive-coated area 510 between the first non-adhesive-coated area 521 and the second non-adhesive-coated area 522 means that the adhesive-coated area 510 is positioned in the middle of the insulating layer 500. After the insulating layer 500 is installed, the position of the adhesive-coated area 510 completely covers the underlying tab 200. The adhesive-coated area 510 forms a strong bond with the tab 200 through the adhesive on it, thus stably fixing the insulating layer 500 to the tab 200. After installation, the first non-adhesive-coated areas 521 and the second non-adhesive-coated areas 522 on both sides of the insulating layer 500 cover the underlying conductive plate 300. When maintenance is required, operators typically begin peeling from the edge of the insulation layer 500. Since the first non-adhesive area 521 and the second non-adhesive area 522 on both sides of the insulation layer 500 are not bonded to the conductive sheet, the peeling force can be easily transmitted from here. The peeling process smoothly progresses towards the center along the interface between the insulation layer 500 and the conductive sheet until it encounters the adhesive area 510. Ultimately, the peeling force concentrates at the bonding interface between the adhesive area 510 and the tab 200, causing cohesive or interfacial failure of the adhesive layer at this point, thus completely peeling off the entire insulation layer 500. This process exerts almost no tearing force on the tab 200 and conductive plate 300 beneath the insulation layer 500, perfectly achieving non-destructive maintenance and avoiding the risk of secondary damage caused by maintenance. Furthermore, the concentrated adhesive application at the center of the insulation layer 500 ensures a more uniform adhesive layer thickness and more effective bonding area, thereby providing stronger overall adhesion and making the connection between the insulation layer 500 and the tab 200 more secure.

[0032] Please see Figure 3 The battery module 1000 comprises multiple battery cells 100, multiple battery strips 200, and multiple conductive plates 300. The battery cells 100 are arranged sequentially, with each adjacent pair of cells 100 electrically connected via a battery strip 200. Each battery strip 200 corresponds one-to-one with a conductive plate 300. An adhesive-coated area 510 covers multiple battery strips 200, and an uncoated area 520 covers multiple conductive plates 300. The battery module 1000 consists of multiple independent battery cell units 100. A battery strip 200 can connect two adjacent cells 100 in series or parallel. Each battery strip 200 is connected to a corresponding conductive plate 300. The multiple conductive plates 300 combine the current from the multiple battery strips 200 and then output it uniformly to the circuit board 400.

[0033] The adhesive coating area 510 on the insulating layer 500 simultaneously covers all the battery contacts 200, bonding them together with a single piece of adhesive. This facilitates unified heat management and efficient heat dissipation from all contacts 200, helping to reduce hot spot temperatures inside the battery module 1000 and resulting in a more uniform temperature distribution, thereby improving battery performance and lifespan. Because the adhesive coating area 510 has a uniform structure, during maintenance, such as replacing the circuit board 400 beneath the insulating layer 500, a more controllable method can be used, such as hot air or a specialized solvent, to peel off the insulating layer 500 as a whole. Since the non-adhesive coating area 520 is not bonded to the conductive plate 300, the peeling process primarily overcomes the adhesive force of the adhesive coating area 510, resulting in a uniform force distribution and reducing the likelihood of localized tearing. Compared to multiple independent bonding points, this integrated structure prevents the conductive plate 300 from being peeled off along with the insulating layer 500 during maintenance, making it easier to disassemble the battery module 1000 without damage or with minimal damage, reducing maintenance costs and difficulty.

[0034] The projected area of ​​the adhesive coating area 510 along the thickness direction of the multiple pads 200 is larger than the total area of ​​the multiple pads 200. This larger projected area along the thickness direction of the pads 200 means that the outline of the adhesive coating area 510 extends beyond the overall outline formed by the outlines of all the pads 200. The adhesive coating area 510 covers not only all the pads 200 themselves, but also the gaps between the pads 200 and the edge areas of each pad 200. The multiple battery cells 100 will undergo thermal expansion and contraction during charging and discharging and at different ambient temperatures. Due to the different coefficients of thermal expansion of the materials such as the battery cells 100, pads 200, and conductive plates 300, relative displacement and shear stress will occur between them. The large adhesive coating area 510 has sufficient elastic buffer to absorb the deformation and stress caused by the difference in thermal expansion, preventing the battery plate 200 from breaking, the solder joint from cracking or the adhesive layer from falling off due to stress accumulation, thus ensuring the structural integrity of the battery module 1000 under long-term temperature changes.

[0035] The area of ​​the non-adhesive-coated region 520 projected along the thickness direction of the multiple conductive plates 300 is larger than the total area of ​​the multiple conductive plates 300. Along the thickness direction of the conductive plates 300, the outline of the non-adhesive-coated region 520 extends beyond the total outline formed by the outlines of all the conductive plates 300. The non-adhesive-coated region 520 not only covers all the conductive plates 300 themselves, but also covers the gaps between the conductive plates 300, as well as the edge areas of each conductive plate 300. Gaps exist between the multiple conductive plates 300. During the production, transportation, or long-term use of the battery module 1000, metal debris such as screw shavings, welding slag, conductive dust, or even condensed water droplets may fall into these gaps, bridging adjacent conductive plates 300 and causing a catastrophic short circuit. The non-adhesive-coated region 520 completely covers these gaps, eliminating the possibility of foreign object bridging and minimizing the risk of internal short circuits. Meanwhile, the large area coverage of the insulating layer 500 allows the heat generated by the conductive plate 300 to be more evenly conducted to the entire plane of the insulating layer 500.

[0036] Please see Figures 3 to 4 An insulating layer 500 covers the terminals 110 of multiple battery cells 100. The terminals 110 of a battery cell 100 are metal terminals connecting the internal positive and negative active materials of the cell 100 to the external circuit, serving as the entry and exit points for current. The terminals 110 of a battery cell 100 are typically raised metal structures, representing either the positive or negative terminal 110 of the battery cell 100. The positive terminal 110 is located at the top of the battery cell 100, and the negative terminal 110 is located at the bottom of the battery cell 100. In addition to conductive components such as the electrode plate 200 and the conductive plate 300, the terminal post 110 of the battery cell 100 itself is also covered by the insulating layer 500. This ensures that all potentially charged, high-potential metal components inside the battery module 1000, including the electrode plate 200, the conductive plate 300, and the terminal post 110 of the battery cell 100, are uniformly wrapped up, achieving physical and electrical isolation from other parts inside the module, such as the metal casing, cooling plate, wiring harness, and the hands of maintenance personnel.

[0037] The insulating layer 500 encapsulates the cell 100, the electrode plate 200, the conductive plate 300, and the terminal 110 together, forming a more structurally unified whole. The insulating layer 500 provides cushioning and constraint, reducing the micro-movements of the terminal 110 relative to the cell 100 body under severe vibration or impact, preventing loosening or damage due to micro-movement wear. Simultaneously, the insulating layer 500, using thermally conductive insulating material, serves as a standardized thermal path to guide heat from the terminal 110 to the module cooling plate, helping to manage heat on the top of the cell 100 more evenly and efficiently. The insulating layer 500 is also part of the battery module 1000 sealing system, effectively preventing external dust, moisture, and other contaminants from intruding into the core area of ​​the module, thus improving the overall IP protection rating of the module.

[0038] This application also provides a battery pack, the battery pack including as follows: Figure 1 The battery module 1000 is shown. The adhesive-coated area 510 in the insulating layer 500 is firmly connected to the contact plate 200 with adhesive, covering the surface of the contact plate 200 and effectively preventing short circuits caused by contact between the contact plate 200 and external conductive components. The non-adhesive-coated area 520 covers the conductive plate 300. Through a design where the projected area is larger than the total area of ​​the conductive plate 300, the conductive plate 300 is ensured to be completely isolated, further reducing the risk of short circuits. This partitioned design significantly improves the electrical safety of the battery pack. During maintenance of the battery module 1000 in the battery pack, the conductive plate 300, not being bonded to the insulating layer 500, avoids being torn off when the insulating layer 500 is peeled off, significantly reducing the difficulty and risk of battery pack maintenance. By reducing damage to the conductive plate 300 area during maintenance, the cost of replacement and repair is reduced.

[0039] This application also provides an electrical device, which includes a battery pack. In some feasible implementations, the electrical device can be an energy storage system, such as a home or industrial energy storage system. The partitioned design of the adhesive-coated area 510 and the non-adhesive-coated area 520 of the insulation layer 500 reduces the risk of short circuits and thermal runaway, ensuring the stability of the energy storage system during long-term operation. The electrical device can also be a new energy vehicle, where the high energy density and safety of the battery pack meet the high requirements of electric vehicles for power sources. The insulation design of the adhesive-coated area 510 and the non-adhesive-coated area 520 of the insulation layer 500 in the battery module 1000 of the battery pack ensures the stable operation of the battery pack under complex operating conditions. At the same time, concentrating the adhesive-coated area 510 in the middle of the insulation layer 500 reduces the use of adhesive, effectively reducing the production cost of the battery pack.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application 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.

[0041] Furthermore, the use of terms such as "first," "second," etc., in this application 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 application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] Furthermore, the technical solutions of the various embodiments of this application 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 scope of protection claimed by this application.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery module, characterized in that, The battery module includes a battery cell, a battery pad, a conductive plate, a circuit board, and an insulating layer. The battery cell, battery pad, conductive plate, and circuit board are connected in sequence, and the insulating layer covers the battery pad and the conductive plate. The insulating layer includes an adhesive-coated area and a non-adhesive-coated area. The adhesive-coated area is connected to the pad by adhesive and covers the pad. The non-adhesive-coated area covers the conductive plate.

2. The battery module as described in claim 1, characterized in that, The area of ​​the coating region projected onto the thickness direction of the plaster is larger than the area of ​​the plaster itself.

3. The battery module as described in claim 2, characterized in that, The area of ​​the non-coated region in the thickness direction of the conductive plate is larger than the area of ​​the conductive plate.

4. The battery module as described in any one of claims 1 to 3, characterized in that, The non-adhesive area includes a first non-adhesive area and a second non-adhesive area, and the adhesive area is located between the first non-adhesive area and the second non-adhesive area.

5. The battery module as described in claim 1, characterized in that, The battery cell has multiple cells, multiple pads, and multiple conductive plates. The multiple battery cells are arranged in sequence, and each pair of adjacent battery cells is electrically connected through a pad. The multiple pads correspond one-to-one with the multiple conductive plates. The adhesive-coated area covers the multiple pads, and the non-adhesive-coated area covers the multiple conductive plates.

6. The battery module as described in claim 5, characterized in that, The area of ​​the coating region projected along the thickness direction of the plurality of patches is greater than the total area of ​​the plurality of patches.

7. The battery module as described in claim 6, characterized in that, The area of ​​the uncoated region projected along the thickness direction of the multiple conductive plates is greater than the total area of ​​the multiple conductive plates.

8. The battery module as described in any one of claims 5 to 7, characterized in that, The insulating layer covers the terminals of the plurality of battery cells.

9. A battery pack, characterized in that, The battery pack includes the battery module as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, The electrical equipment includes the battery pack as described in claim 9.

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