Protective device for positive electrode and negative electrode of power battery module

Abstract

The utility model discloses a protection device for positive and negative electrodes of a power battery module, and relates to the technical field of power batteries. The aluminum bar fixing device specifically comprises a base, the bottom of the base is provided with a limiting block which can be inserted into a limiting groove of a module end plate and is matched with the limiting groove in shape, the side, opposite to the limiting block, of the base is a mounting face, and the mounting face is provided with a fixing hole for a fixing piece to penetrate through so as to fix an aluminum bar on the mounting face; and the protective cover can be arranged on the mounting surface in a covering manner so as to realize insulation protection on the aluminum bar. When an aluminum bar is fixed to a base of the protection device through bolts, the base is prevented from rotating, and the accuracy of the set torque is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a protection device for the positive and negative electrodes of a power battery module. Background Technique

[0002] As an emerging green means of transportation, electric vehicles have been widely promoted and applied globally in recent years. Compared with traditional fuel vehicles, electric vehicles have the advantages of zero emissions, low noise, and high efficiency. However, the uniqueness of electric vehicles in the power system also brings new technical challenges and safety hazards, especially the safety issues related to high-voltage electrical systems.

[0003] The power source of electric vehicles mainly depends on a high-voltage and large-current power battery system. Generally, the voltage used in electric vehicles can reach 400V to 800V (direct current), and the current can reach more than 100A. Such a high-voltage electrical system not only provides powerful power but also poses higher requirements for the safe use of the vehicle. According to relevant research, when the direct current voltage reaches 36V, it already poses a threat to human life safety. The high-voltage system voltage of electric vehicles is usually above 400V. Once this voltage level comes into contact with the human body, it can cause serious injuries or even death in just 10 milliseconds. Therefore, the safety protection of the high-voltage system is particularly important.

[0004] To improve the safety of power batteries, the high-voltage insulation protection of the positive and negative electrodes is particularly crucial. Currently, the high-voltage insulation protection of power battery modules is mainly achieved by designing a special injection molding part. However, after the existing protection device is installed above the module end plate and the aluminum bar is fixed to the base of the protection device through bolts, since there is no limit design to prevent rotation in the X and Y directions of the base of the protection device. When installing the copper bar with bolts and setting the torque, the base of the protection device will rotate and shift under the force, resulting in inaccurate torque setting. This not only affects the installation accuracy and firmness of the aluminum bar but also reduces its insulation performance, thus bringing potential safety hazards.

[0005] Therefore, when fixing the aluminum bar to the base of the protection device through bolts, how to avoid the rotation of the base and ensure the accuracy of the set torque has become an urgent technical problem to be solved. Content of the Utility Model

[0006] The main purpose of the utility model is to provide a protection device for the positive and negative electrodes of a power battery module, aiming to avoid the rotation of the base and ensure the accuracy of the set torque when fixing the aluminum bar to the base of the protection device through bolts.

[0007] To achieve the above purpose, the utility model proposes a protection device for the positive and negative electrodes of a power battery module, including:

[0008] A base, with a limiting block at the bottom that can be inserted into a limiting groove on the module end plate and is matched with the shape of the limiting groove. On the side of the base opposite to the limiting block is an installation surface, and fixing holes are provided on the installation surface for a fixing member to pass through to fix the aluminum bar on the installation surface; and

[0009] A protective cover that can be covered on the installation surface to achieve insulation protection for the aluminum bar.

[0010] The cooperation of the limiting block and the limiting groove enables the base to be accurately positioned when installed on the module end plate, preventing the base from rotating and shifting, improving the installation accuracy and stability. It avoids the problem of the base rotating and shifting due to force when fixing the aluminum bar, thus ensuring the accuracy of torque setting and improving the installation quality. The protective cover comprehensively covers and provides insulation protection for the aluminum bar, effectively preventing problems such as electrical short - circuit and leakage, improving the insulation performance and safety of the battery module.

[0011] In an embodiment of the present application, the limiting block is provided with a first claw, and the module end plate is provided with an end - plate card slot. When the base is inserted into the limiting groove of the module end plate, the first claw is clamped in the end - plate card slot.

[0012] Through the insertion of the limiting block and the limiting groove and the clamping of the first claw and the end - plate card slot, multi - directional limiting of the base is achieved, preventing the base from rotating and moving during the installation process, improving the installation accuracy and stability. Under the multi - directional limiting design, the torque applied by the fixing member is more accurate, avoiding the problem of inaccurate torque caused by the movement or rotation of the base, and improving the installation quality.

[0013] In an embodiment of the present application, the first claw is connected to the bottom of the limiting block.

[0014] The first claw is connected to the bottom of the limiting block, which can facilitate the shape matching between the limiting block and the limiting groove, simplify the shape design of the limiting block, with a simple structure and easy to implement.

[0015] In an embodiment of the present application, the installation surface is rectangular, and a first vertical plate, a second vertical plate, and a third vertical plate are sequentially connected end - to - end on the periphery of the installation surface; wherein, after the aluminum bar bends and extends from the top of the second vertical plate to the bottom of the second vertical plate, it adheres to the installation surface.

[0016] The aluminum bar bends and extends along the second vertical plate and adheres to the installation surface, increasing the contact area between the aluminum bar and the base. Fixed on the installation surface through the fixing member, it ensures the stable position of the aluminum bar and enhances the fixing effect. Since the horizontal height of the aluminum bar decreases after bending, the height of the protective cover covering it decreases, reducing the space occupied by the protective cover.

[0017] In an embodiment of the present application, the protective cover includes:

[0018] A rectangular top plate, on the periphery of which there are a first guard plate, a second guard plate, and a third guard plate connected end to end in sequence; wherein, when the protective cover is covered on the installation surface, the side of the rectangular top plate without a guard plate faces the second vertical plate.

[0019] The design of the rectangular top plate of the protective cover and the guard plates on its periphery ensures that the aluminum bar is fully covered and provides insulation protection, effectively preventing electrical short - circuit and leakage problems. The design of the side without a guard plate facilitates installation and disassembly, improving the convenience of operation.

[0020] In an embodiment of the present application, both the first vertical plate and the third vertical plate are provided with vertical - plate card slots, and both the first guard plate and the third guard plate are provided with second claws. When the protective cover is covered on the installation surface, the second claws are clamped in the vertical - plate card slots.

[0021] By clamping the second claws in the vertical - plate card slots, a firm connection between the first guard plate and the third guard plate and the first vertical plate and the third vertical plate is achieved, ensuring the stability of the entire structure. The cooperative design of the vertical - plate card slots and the second claws makes the installation and disassembly of the guard plates simple, without the need for additional fixing devices, improving the installation efficiency.

[0022] In an embodiment of the present application, there is a gap between the second claw and the first guard plate and / or the third guard plate.

[0023] There is a gap between the second claw and the first guard plate and / or the third guard plate, that is, the second claw is independent of the first guard plate and / or the third guard plate, so that the second claw has a certain elasticity, facilitating the operation of the second claw, such as popping out or clamping in.

[0024] In an embodiment of the present application, the base is formed by mixed injection molding of polycarbonate and acrylonitrile - butadiene - styrene copolymer.

[0025] Polycarbonate (PC) has excellent mechanical strength and impact toughness, and can withstand large external force impacts without being easily broken. Acrylonitrile - butadiene - styrene copolymer (ABS) can provide good toughness and impact resistance, and can maintain good performance in low - temperature environments. The PC / ABS mixed material has good dimensional stability after molding and is not easily deformed, ensuring the accuracy and stability of the base.

[0026] In an embodiment of the present application, the protective cover is formed by mixed injection molding of polycarbonate and acrylonitrile - butadiene - styrene copolymer.

[0027] Polycarbonate (PC) has excellent mechanical strength and impact toughness, and can withstand large external force impacts without being easily broken. Acrylonitrile-butadiene-styrene copolymer (ABS) can provide good toughness and impact resistance, and can maintain good performance in low-temperature environments. The PC / ABS composite material has good dimensional stability after molding and is not easily deformed, ensuring the accuracy and stability of the protective cover.

[0028] In an embodiment of the present application, the limiting block is rectangular.

[0029] Designing the limiting block to be rectangular improves the limiting strength of the limiting block and avoids deformation of the limiting block.

[0030] Adopting the above technical solution, the cooperation of the limiting block and the limiting groove enables the base to be accurately positioned when installed on the module end plate, prevents the base from rotating and shifting, and improves the installation accuracy and stability. It avoids the problem of the base rotating and shifting due to force when fixing the aluminum bar, thereby ensuring the accuracy of torque setting and improving the installation quality. The protective cover fully covers and provides insulation protection for the aluminum bar, effectively preventing problems such as electrical short circuits and leakage, and improving the insulation performance and safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following will describe the present utility model in detail with reference to specific embodiments and drawings, where:

[0032] Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0033] Figure 2 is Figure 1 a three-dimensional structural diagram of the base in

[0034] Figure 3 is Figure 1 a three-dimensional structural diagram of the protective cover in

[0035] Figure 4 is Figure 1 a three-dimensional structural diagram of the module end plate in

[0036] Figure 5 is Figure 4 an enlarged structural diagram of part A in

[0037] 10. Base; 11. Limiting block; 12. First claw; 13. First vertical plate; 14. Second vertical plate; 15. Third vertical plate; 16. Vertical plate clamping groove; 20. Protective cover; 21. Rectangular top plate; 22. First protective plate; 23. Third protective plate; 24. Second claw; 30. Module end plate; 31. End plate clamping groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present utility model and do not constitute a limitation to the present utility model.

[0039] As Figures 1 to 5 shown, to achieve the above objectives, the present utility model proposes a protection device for the positive and negative electrodes of a power battery module, including:

[0040] A base 10, the bottom of which is provided with a limiting block 11 that can be inserted into a limiting groove of the module end plate 30 and is matched with the shape of the limiting groove. The side of the base 10 opposite to the limiting block 11 is an installation surface, and the installation surface is provided with fixing holes through which fixing members can pass to fix the aluminum bar on the installation surface; and

[0041] A protective cover 20, which can be covered on the installation surface to achieve insulation protection for the aluminum bar.

[0042] Specifically, the limiting block 11 is located at the bottom of the base 10, can be inserted into the limiting groove of the module end plate 30, and is matched with the shape of the limiting groove. The limiting block 11 ensures the accurate positioning of the base 10 on the module end plate 30 and prevents the rotational offset of the base 10 in the X and Y directions. The side of the base 10 opposite to the limiting block 11 is the installation surface, and the installation surface is provided with fixing holes for fixing the aluminum bar. The design of the fixing holes enables fixing members (such as bolts) to pass through the fixing holes and firmly fix the aluminum bar on the installation surface of the base 10.

[0043] The main function of the protective cover 20 is to cover the installation surface of the base 10 to provide insulation protection for the aluminum bar. The design of the protective cover 20 should be matched with the shape of the installation surface of the base 10 to ensure that it can completely cover the aluminum bar and provide effective insulation protection.

[0044] The bottom limiting block 11 of the base 10 is inserted into the limiting groove of the module end plate 30, and the limiting block 11 is matched with the shape of the limiting groove to achieve the accurate positioning of the base 10 on the module end plate 30. The limiting block 11 effectively prevents the rotational offset of the base 10 in the X and Y directions.

[0045] The aluminum bar is fixed on the installation surface of the base 10 through a fixing member (such as a bolt). The fixing member passes through the fixing hole on the installation surface of the base 10 and firmly presses the aluminum bar on the installation surface to ensure a firm and stable connection between the aluminum bar and the base 10.

[0046] The protective cover 20 is covered on the installation surface of the base 10 to cover the aluminum bar fixed on the installation surface. The connection between the protective cover 20 and the base 10 should be tight to ensure comprehensive insulation protection for the aluminum bar. The specific connection method can be achieved through buckles, screws, etc., so that the protective cover 20 can be firmly fixed on the base 10.

[0047] With the above technical solution, the cooperation between the limiting block 11 and the limiting groove enables the base 10 to be accurately positioned when installed on the module end plate 30, preventing the base 10 from rotating and shifting, improving the installation accuracy and stability. It avoids the problem of the base 10 rotating and shifting due to force when fixing the aluminum bar, thus ensuring the accuracy of torque setting and improving the installation quality. The protective cover 20 fully covers and provides insulation protection for the aluminum bar, effectively preventing problems such as electrical short circuit and leakage, and improving the insulation performance and safety of the battery module.

[0048] In an embodiment of the present application, the limiting block 11 is provided with a first claw 12, and the module end plate 30 is provided with an end plate slot 31. When the base 10 is inserted into the limiting groove of the module end plate 30, the first claw 12 is clamped into the end plate slot 31.

[0049] Specifically, the limiting block 11 is provided at the bottom of the base 10, and its shape matches the limiting groove on the module end plate 30. The first claw 12 is provided on the limiting block 11 to further stabilize the connection between the base 10 and the module end plate 30. The mounting surface is located on the side of the base 10 opposite to the limiting block 11, mainly for fixing the aluminum bar. A plurality of fixing holes are provided on the mounting surface for fixing members (such as bolts) to pass through to fix the aluminum bar on the mounting surface. The protective cover 20 is used to cover the mounting surface of the base 10 and the aluminum bar thereon to provide insulation protection.

[0050] The limiting block 11 at the bottom of the base 10 is inserted into the limiting groove on the module end plate 30 to ensure the preliminary positioning of the base 10 on the module end plate 30. After the limiting block 11 of the base 10 is inserted into the limiting groove, the first claw 12 on the limiting block 11 is snapped into the end plate slot 31 on the module end plate 30, realizing the firm connection between the base 10 and the module end plate 30. The matching design of the claw and the slot ensures that the base 10 will not rotate or move in the X and Y directions.

[0051] With the above technical solution, through the insertion of the limiting block 11 and the limiting groove and the clamping design of the first claw 12 and the end plate slot 31, multi-directional limiting of the base 10 is achieved, preventing the base 10 from rotating and moving during installation, and improving the installation accuracy and stability. Under the multi-directional limiting design, the torque applied by the fixing member is more accurate, avoiding the problem of inaccurate torque caused by the movement or rotation of the base 10, and improving the installation quality.

[0052] In an embodiment of the present application, the first claw 12 is connected to the bottom of the limiting block 11.

[0053] Specifically, the first claw 12 is connected to the bottom of the limiting block 11, which can facilitate the shape matching between the limiting block 11 and the limiting groove, simplify the shape design of the limiting block 11, with a simple structure and easy to implement.

[0054] In an embodiment of the present application, the mounting surface is rectangular, and a first vertical plate 13, a second vertical plate 14, and a third vertical plate 15 are sequentially connected end to end on the peripheral side of the mounting surface; wherein, after the aluminum bar bends and extends from the top of the second vertical plate 14 to the bottom of the second vertical plate 14, it fits on the mounting surface.

[0055] Specifically, the shape of the mounting surface is rectangular and is used to fix the aluminum bar. The peripheral side of the mounting surface is provided with a first vertical plate 13, a second vertical plate 14, and a third vertical plate 15 that are sequentially connected end to end. After the aluminum bar bends and extends from the top of the second vertical plate 14 to the bottom of the second vertical plate 14, it fits on the mounting surface of the base 10. It is fixed on the mounting surface through a fixing member (such as a bolt) passing through a fixing hole.

[0056] The aluminum bar bends and extends from the top to the bottom of the second vertical plate 14 and fits on the mounting surface. Through the bending design, the aluminum bar can closely fit the mounting surface.

[0057] Adopting the above technical solution, the aluminum bar bends and extends along the second vertical plate 14 and fits on the mounting surface, increasing the contact area between the aluminum bar and the base 10. It is fixed on the mounting surface through a fixing member, ensuring the stable position of the aluminum bar and enhancing the fixing effect. Since the horizontal height of the aluminum bar decreases after bending, the height of the protective cover 20 covering it decreases, reducing the space occupied by the protective cover 20.

[0058] In an embodiment of the present application, the protective cover 20 includes:

[0059] A rectangular top plate 21, and a first protective plate 22, a second protective plate, and a third protective plate 23 are sequentially connected end to end on the peripheral side of the rectangular top plate 21; wherein, when the protective cover 20 is covered on the mounting surface, the side of the rectangular top plate 21 without a protective plate faces the second vertical plate 14.

[0060] Specifically, the protective cover 20 includes a rectangular top plate 21, a first protective plate 22, a second protective plate, and a third protective plate 23;

[0061] The rectangular top plate 21 is the main part of the protective cover 20 and is used to cover the mounting surface of the base 10 and the aluminum bar thereon to provide insulation protection.

[0062] Three protective plates are sequentially connected end to end on the peripheral side of the rectangular top plate 21. When the protective cover 20 is covered on the mounting surface, these protective plates surround the first vertical plate 13 and the third vertical plate 15 of the base 10, further enhancing the protection effect.

[0063] One side of the rectangular top plate 21 is not provided with a protective plate, and this side faces the second vertical plate 14 of the base 10. This design ensures that the lead-out and connection operations of the aluminum bar are not affected.

[0064] With the above technical solution, the design of the rectangular top plate 21 of the protective cover 20 and the protective plates on its peripheral side ensures that the aluminum bars are fully covered and provides insulation protection, effectively preventing electrical short - circuit and leakage problems. The side without the protective plate is designed for easy installation and disassembly, improving the convenience of operation.

[0065] In an embodiment of the present application, the first vertical plate 13 and the third vertical plate 15 are both provided with vertical - plate card slots 16, and the first protective plate 22 and the third protective plate 23 are both provided with second claws 24. When the protective cover 20 is covered on the mounting surface, the second claws 24 are snapped into the vertical - plate card slots 16.

[0066] Specifically, the first vertical plate 13 and the third vertical plate 15 are vertically installed on the mounting surface, and are provided with vertical - plate card slots 16 on them.

[0067] The first protective plate 22 and the third protective plate 23 are installed on the rectangular top plate 21. When the protective cover 20 is covered on the mounting surface, the first protective plate 22 and the third protective plate 23 are respectively connected to the card slots on the first vertical plate 13 and the third vertical plate 15 through the second claws 24.

[0068] With the above technical solution, by snapping the second claws 24 into the vertical - plate card slots 16, a firm connection between the first protective plate 22 and the third protective plate 23 and the first vertical plate 13 and the third vertical plate 15 is achieved, ensuring the stability of the entire structure. The combined design of the vertical - plate card slots 16 and the second claws 24 makes the installation and disassembly of the protective plates simple, without the need for additional fixing devices, improving the installation efficiency.

[0069] In an embodiment of the present application, there is a gap between the second claws 24 and the first protective plate 22 and / or the third protective plate 23.

[0070] With the above technical solution, there is a gap between the second claws 24 and the first protective plate 22 and / or the third protective plate 23, that is, the second claws 24 are independent of the first protective plate 22 and / or the third protective plate 23, so that the second claws 24 have a certain elasticity, facilitating the operation of the second claws 24, such as popping out or snapping in.

[0071] In an embodiment of the present application, the base 10 is formed by mixed injection molding of polycarbonate and acrylonitrile - butadiene - styrene copolymer.

[0072] With the above technical solution, polycarbonate (PC) has excellent mechanical strength and impact toughness, and can withstand large external force impacts without being easily broken. Acrylonitrile - butadiene - styrene copolymer (ABS) can provide good toughness and impact resistance, and can maintain good performance in low - temperature environments. The PC / ABS mixed material has good dimensional stability after molding and is not easily deformed, ensuring the accuracy and stability of the base 10.

[0073] In an embodiment of the present application, the protective cover 20 is integrally injection-molded from a mixture of polycarbonate and acrylonitrile-butadiene-styrene copolymer.

[0074] With the above technical solution, polycarbonate (PC) has excellent mechanical strength and impact toughness, and can withstand a large external force impact without being easily broken. Acrylonitrile-butadiene-styrene copolymer (ABS) can provide good toughness and impact resistance, and can maintain good performance in a low-temperature environment. The PC / ABS composite material has good dimensional stability after molding and is not easily deformed, ensuring the accuracy and stability of the protective cover 20.

[0075] In an embodiment of the present application, the limiting block 11 is rectangular.

[0076] With the above technical solution, the limiting block 11 is designed to be rectangular, which improves the limiting strength of the limiting block 11 and prevents the limiting block 11 from deforming.

[0077] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A protective device for positive and negative electrodes of a power battery module, characterized in that: include: A base, with a limit block at the bottom that can be inserted into the limit groove of the module end plate and matches the shape of the limit groove, and a mounting surface on the side of the base opposite to the limit block, and a fixing hole on the mounting surface for a fixing piece to pass through to fix the aluminum bar on the mounting surface; and A protective cover can be arranged on the mounting surface to provide insulation protection for the aluminum bar.

2. The protective device for positive and negative electrodes of a power battery module according to claim 1, characterized in that: The limiting block is provided with a first clamping claw, and the module end plate is provided with an end plate clamping groove. When the base is inserted into the limiting groove of the module end plate, the first clamping claw is clamped in the end plate clamping groove.

3. The protective device for positive and negative electrodes of a power battery module according to claim 2, characterized in that: The first clamping claw is connected to the bottom of the limiting block.

4. The protective device for positive and negative electrodes of a power battery module according to claim 1, characterized in that: The mounting surface is rectangular, and a first vertical plate, a second vertical plate, and a third vertical plate connected end to end are provided on the circumference of the mounting surface; wherein the aluminum bar is bent and extended along the top of the second vertical plate to the bottom of the second vertical plate, and then adhered to the mounting surface.

5. The protective device for positive and negative electrodes of a power battery module according to claim 4, characterized in that: The protective cover comprises: A rectangular top plate, wherein a first guard plate, a second guard plate, and a third guard plate connected end to end in sequence are arranged on the circumferential side of the rectangular top plate; wherein, when the protective cover is arranged on the mounting surface, the side of the rectangular top plate where no guard plate is arranged faces the second vertical plate.

6. The protective device for positive and negative electrodes of a power battery module according to claim 5, characterized in that: The first vertical plate and the third vertical plate are both provided with vertical plate slots, and the first guard plate and the third guard plate are both provided with second claws. When the protective cover is arranged on the mounting surface, the second claws are engaged in the vertical plate slots.

7. The protective device for positive and negative electrodes of a power battery module according to claim 6, characterized in that: A gap is provided between the second clamping claw and the first guard plate and / or the third guard plate.

8. The protective device for positive and negative electrodes of a power battery module according to claim 1, characterized in that: The base is formed by mixed injection molding of polycarbonate and acrylonitrile-butadiene-styrene copolymer.

9. The protective device for positive and negative electrodes of a power battery module according to claim 1, characterized in that: The protective cover is formed by mixed injection molding of polycarbonate and acrylonitrile-butadiene-styrene copolymer.

10. The protective device for positive and negative electrodes of a power battery module according to claim 1, characterized in that: The limiting block is rectangular.

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