Protection assembly for a battery module and battery module

Abstract

Protective assembly for a battery module, characterized in that it comprises a base and a limiting element; wherein the base is used for arranging a low-voltage connector and for arranging a positive electrode lead end and / or a negative electrode lead end of a current busbar located on the same side of the battery module as the low-voltage connector; wherein the base comprises a receiving cavity and an installation cavity, the receiving cavity being used to accommodate the low-voltage connector; wherein the receiving cavity comprises a side wall, wherein the side wall of the receiving cavity is arranged between the installation cavity and the receiving cavity; the installation cavity is firmly connected to the limiting element to restrict movement of the low-voltage connector.

Description

[0001] The present application claims priority over the Chinese patent application under number 202010361979.0 and entitled "Connector protection assembly and battery module", which was filed with the State Intellectual Property Administration in China on April 30, 2020, and is incorporated in its entirety by reference as part of the present application. Technical field

[0002] The present invention relates to the technical field of batteries, in particular a protective assembly for a battery module and a battery module. Technical background

[0003] Due to advances in new energy technologies and strong support from government agencies in various countries, new energy batteries are being used on an ever-increasing scale, for example in electric vehicles. Currently, if the high-voltage element and the low-voltage connector assembly of the battery module are located on the same side, separate protective devices must be provided, which is inconvenient during installation and disassembly. Content of the invention

[0004] The present application provides a protective assembly for a battery module, wherein the positive electrode lead end and / or the negative electrode lead end of a current busbar and a low-voltage connector are each provided on a support section or a receiving section of a base, respectively, and wherein the support section and the receiving section are located on the same side to facilitate protection and installation.

[0005] To achieve the above purpose, the present application provides a protection assembly for a battery module, comprising the following: a base and a limiting element; wherein the base is used to arrange a low-voltage connector and to arrange a positive electrode lead end and / or a negative electrode lead end of a current busbar located on the battery module like the low-voltage connector;

[0006] The base comprises a receiving cavity and an installation cavity, wherein the receiving cavity is used to receive the low-voltage connector; wherein the receiving cavity comprises a side wall, the side wall of the receiving cavity being arranged between the installation cavity and the receiving cavity; wherein the installation cavity is rigidly connected to the limiting element to restrict movement of the low-voltage connector.

[0007] In the protective assembly for a battery module of the present application, the positive electrode lead end and / or the negative electrode lead end of the busbar and the low-voltage connector are arranged on the same side of the battery module, making it easy to install and dismantle. The base comprises a receiving cavity and an installation cavity, the receiving cavity being used to receive the low-voltage connector; a side wall of the receiving cavity is arranged between the installation cavity and the receiving cavity; the installation cavity is rigidly connected to the limiting element to restrict movement of the low-voltage connector.The limiting element can restrict the movement of the low-voltage connector, and the installation cavity secures the limiting element, further reducing the vibration of the connector during vibration, shock, and other operating conditions of the module.

[0008] The present application further provides a battery module comprising the above-mentioned protection assembly for a battery module. The beneficial effect of the battery module is the same as the effect of the protection assembly for a battery module and is not repeated. Images Fig. Figure 1 shows a schematic representation of the structure of a base of a protection assembly for a battery module in an embodiment of the present application; Fig. Figure 2 shows a schematic representation of the structure of a mounting frame of the protective assembly for a battery module in an embodiment of the present application; Fig. Figure 3 shows a schematic representation of the structure of a protective cover of the protective assembly for a battery module in an embodiment of the present application; Fig. Figure 4 shows a schematic representation of the structure of a low-voltage connector of the protection assembly for a battery module in an embodiment of the present application; Fig. Figure 5 shows a schematic representation of the structure of the low-voltage connector when installed at the base of the protection assembly for a battery module in an embodiment of the present application; Fig. Figure 6 shows an exploded view of the protective assembly for a battery module in an embodiment of the present application; Fig. Figure 7 shows a schematic representation of the structure of the protective assembly for a battery module after assembly in an embodiment of the present application;

[0009] Reference numeral list: 1-Base; 100-Receiving section; 101-Receiving cavity; 102-Installation cavity; 103-First bayonet; 104-Frame; 105-Mounting section; 110-Support section; 120-Separating section; 121-Separating cavity; 122-Side wall of receiving cavity; 130-Third snap lock; 2-Mounting frame; 200-Snap element; 201-First extension; 202-First snap lock; 210-Limiting element; 211-First side plate; 212-Limiting plate; 220-Connecting plate; 230-Reinforcing bar; 240-Second side plate; 3-Protective cover; 300-Main body; 301-Opening groove; 310-Guide column; 320-Second cantilever; 330-Second snap lock; 4-First voltage assembly; 400-Low voltage connector; 410-FPC assembly; 420-Reinforcement plate; 421-Guide positioning hole; 430-Connecting groove; 431-Second bayonet. Description of embodiments

[0010] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. It is clear that the described embodiments represent only a part of the embodiments of the present invention and not all embodiments. All other embodiments that could be obtained by a person skilled in the art in this field based on the embodiments in the present invention without any creative work should be considered to be covered by the scope of protection of the present invention.

[0011] In the present application, the first direction is the Y direction, as in Fig. As shown in section 6, the direction below the first side plate is a reverse direction of the one shown in Fig. The Z-direction shown in Figure 6, and the X, Y and Z directions described in the present application are all in Fig. 6 directions shown.

[0012] As in the Fig. Figures 1 to 7 illustrate a protective assembly comprising a base 1, wherein the base 1 is provided with a support section 110, a receiving section 100 and a separating section 120, wherein the support section 110 is used to accommodate a positive electrode lead end and / or a negative electrode lead end of a current busbar of the battery module, wherein the receiving section 100 is used to accommodate the low-voltage connector, wherein the low-voltage connector is used to transmit a signal from the battery module to a battery management system, wherein the support section 110 and the receiving section 100 are located on the same side of the battery module, and wherein the separating section 120 is located between the support section 110 and the receiving section 100 to disconnect the low-voltage connector from the positive electrode lead end.and / or to disconnect the low-voltage connector from the negative electrode lead end.

[0013] In the protective assembly for a battery module of the present application, the isolating section 120 can isolate the low-voltage connector from the positive electrode end and / or the negative electrode end of the busbar, thereby reducing the probability of a safety problem arising between the low-voltage connector and the positive electrode end and / or the negative electrode end of the busbar. This arrangement also facilitates the protection of the low-voltage connector and the positive electrode end and / or the negative electrode end of the busbar.Since the positive electrode lead end and / or the negative electrode lead end of the power busbar and the low-voltage connector are each located on the support section and the receiving section of the base, and the support section and the receiving section are on the same side to facilitate installation and disassembly.

[0014] As in Fig. 1, Fig. 6 and Fig. As shown in 7, the present application presents a protective assembly comprising the following: a base 1, wherein the base 1 is provided with a receiving section 100 for receiving a first stress assembly 4 and with a support section 110 for placing a second stress assembly; where the receiving section 100 is used to separate the first voltage assembly 4 from the second voltage assembly.

[0015] In the connector protection assembly of the present application, the base 1 is provided with the receiving section 100 and the support section 110. The first stress assembly 4, which is arranged in the receiving section 100, and the second stress assembly, which is arranged in the support section 110, are separated from each other by the receiving section 100, thereby reducing the probability of a safety problem occurring between the first stress assembly 4 and the second stress assembly.

[0016] It should be noted that the first voltage assembly 4 can be a low-voltage connector assembly or a high-voltage busbar, and the second voltage assembly can be either a high-voltage busbar or a low-voltage connector assembly, without being limited to either. For example, the first voltage assembly 4 can be a low-voltage connector assembly, the second voltage assembly is a high-voltage busbar, and the current busbar has a positive electrode lead end and a negative electrode lead end. Further reference to the Fig. 4 and Fig. The low-voltage connector assembly comprises a low-voltage connector 400, a flexible printed circuit board (FPC), and a reinforcement plate 420 for the connector. For example, the low-voltage connector 400, the FPC assembly 410, and the reinforcement plate 420 are joined together by hot pressing or adhesive bonding, and the reinforcement plate 420 is provided with a guide positioning hole 421. When the connector is assembled, the base 1 is provided with a third snap lock 130, and the third snap lock 130 engages with the guide positioning hole 421 provided on the reinforcement plate 420. The third snap lock 130 interacts with the guide and positioning hole 421 on the base 1 to achieve a snap-fit ​​connection between the low-voltage connector assembly and the base 1.To manage and control the battery module, at least one type of signal, such as voltage, current, temperature, etc., from the battery modules must be acquired and transmitted to a battery management system (BMS). For example, FPC collects at least one signal, such as voltage, temperature, etc., from the battery via a nickel foil and transmits it to the low-voltage connector. The low-voltage connector then connects to the BMS via an external wiring harness and transmits the signal to the BMS.

[0017] Furthermore, the low-voltage connector assembly also includes a connecting groove 430 provided on the side of the low-voltage connector 400 facing away from the reinforcement plate 420, and a second bayonet 431 provided on the side of the connecting groove 430 facing away from the low-voltage connector 400, and the second bayonet 431 is used to snap into the second snap lock 330 on the protective cover 3.

[0018] Optionally, the number of support sections 110 is two, and the receiving section 100 is provided between the two support sections 110. Each of the two support sections 110 is used to accommodate a positive electrode lead end and a negative electrode lead end, resulting in a high degree of integration and ease of wiring.

[0019] Optional, as in Fig. As shown in Figure 1, the separating section 120 consists of an insulating material and comprises two separating cavities 121, which are arranged between the two support sections 110 and the receiving section 100. The receiving section 100, the two support sections 110, and the separating section 120 are formed as a single piece, which can improve the strength of the protective assembly; furthermore, the separating section 120 consists of an insulating material, which can further improve its function.

[0020] It should be noted that base 1 is provided with a support surface in an X direction, and this support surface can be used to position the second voltage assembly at the positive and negative electrode leads of the battery module; that is, the support surface is the support section 110. For example, the second voltage assembly can be a current busbar, and thus the positive and / or negative electrode leads of the current busbar can be located in the support section. Furthermore, a separating cavity 121 can be arranged between the support section 110 and the receiving section 100 to increase the distance between the first voltage assembly 4 and the second voltage assembly, which can improve the electrical insulation performance.

[0021] Optional, as in Fig. 1 and Fig. As shown in Figure 2, the receiving section 100 comprises a receiving cavity 101 for receiving the low-voltage connector, the receiving section 100 further comprising a first opening 106, the first opening 106 being connected to the receiving cavity 101, the first opening 106 being used for moving the low-voltage connector in a first direction to move the low-voltage connector into the receiving cavity 101, or to move the low-voltage connector in a direction opposite to the first direction, so that the low-voltage connector moves out of the receiving cavity 101; and the receiving section further comprises a mounting frame 2, the mounting frame comprising a limiting element 210, the limiting element 210 covering the first opening 106 to limit the movement of the low-voltage connector in the direction opposite to the first direction.The first opening 106 facilitates the installation of the low-voltage connector in the receiving cavity 101, and the mounting frame 2 covers the first opening 106 to limit the movement of the low-voltage connector in the opposite direction to the first, thus ensuring that the low-voltage connector can be stably positioned in the receiving cavity 101; this also facilitates disassembly. Optionally, the side wall of the receiving cavity 101 is made of an insulating material, and the separating section 120 comprises the side wall 122 of the receiving cavity.In particular, the side wall between the receiving cavity 101 and the separating cavity consists of an insulating material that can further insulate the low-voltage connector located in the receiving section 100 and the positive electrode lead end and / or the negative electrode lead end of the busbar located in the support section 110.

[0022] Optional, as in Fig. 1, Fig. 2 and Fig. As shown in Figure 4, the present application further comprises a mounting frame 2 for limiting the movement of the first tension assembly 4 within the receiving section 100 in the opposite direction to the first direction. When the first tension assembly 4 is arranged in the receiving section 100, the first tension assembly 4 is limited in the Z-direction and the X-direction, and the mounting frame 2 limits the movement of the first tension assembly 4 in the opposite direction to the first direction, which in turn reduces the occurrence of a situation in which the connector oscillates under vibration, shock and other operating conditions of the module, and improves the reliability of the detection of the first tension assembly 4 in the receiving section 100.

[0023] It should be noted that the mounting frame 2 is snapped into the receiving section 100, or that the mounting frame 2 is connected to the receiving section 100 by means of a screw connection.

[0024] Optionally, the receiving section 100 includes a receiving cavity 101 for receiving the first voltage assembly 4. The receiving cavity 101 is used for snapping into the low-voltage connector to accommodate the low-voltage connector. In particular, a frame 104 is provided in the receiving cavity 101, and the receiving cavity 101 is provided on the two side walls facing the installation cavity 102 with a fastening section 105 corresponding to the frame 104, the fastening section 105 being arranged above the frame 104.In this way, a space for receiving the low-voltage connector can be formed between the mounting section 105 and the frame 104. When the low-voltage connector 400 is arranged in the receiving cavity 101, the surface of the low-voltage connector 400 rests against the mounting section 105, the bottom surface of the low-voltage connector 400 rests against the frame 104, and the side wall of the low-voltage connector 400 rests against the side wall of the receiving cavity 101 facing the installation cavity 102. Furthermore, the receiving section 100 can limit the movement of the low-voltage connector 400 in the X and Z directions to improve the stability of the first voltage assembly 4.

[0025] Optional, as in the Fig. 1 and Fig. As shown in Figure 2, the limiting element 210 comprises a first side plate 211, which covers the first opening 106, and a limiting plate 212, which is arranged below the first side plate 211. The limiting plate 212 is used to bear against an inner wall in the opposite direction to the first direction of the receiving cavity 101 in order to limit the movement of the low-voltage connector in the first direction. In this way, the first side plate 211 is located above the side wall of the receiving cavity 101 and can bear against the top of the side wall of the receiving cavity 101, so that the first side plate 211 is not easily moved, which can further reduce the wobble of the connector during vibrations, shocks, and other operating conditions of the module.

[0026] Optionally, the mounting frame includes 2, as shown in Fig. Figure 2 shows a snap-in element 200, wherein the snap-in element 200 is connected to the limiting element 210; the snap-in element 200 is used to snap into the receiving section. This enables quick installation of the mounting frame 2 onto the receiving section.

[0027] Optionally, the mounting frame 2 comprises a snap element 200 and a limiting element 210 for bearing against an inner wall of the receiving cavity 101, wherein the limiting element 210 is connected to the snap element 200; wherein the receiving section 100 further comprises an installation cavity 102; wherein the snap element 200 interacts with a first bayonet 103 on the installation cavity 102.

[0028] Optional, as in the Fig. As shown in Figures 1 to 2, the receiving section 100 further comprises an installation cavity 102, the installation cavity 102 being arranged between the receiving cavity 101 and the separating section 120; the installation cavity 102 is provided with a first bayonet 103 on a side wall. The snap element 200 comprises a first extension 201 and a first snap lock 202, which is arranged on the first extension 201, the first snap lock 202 being used to interact with the first bayonet 103; the ratio between the length of the first extension 201 and the thickness of the first extension 201 is not less than 5:1. In this way, it can be ensured that the first cantilever 201 can have a sufficiently large deformation to prevent the first cantilever 201 from breaking when the first snap lock 202 on the first cantilever 201 interacts with the first bayonet 103 in the installation cavity 102.

[0029] In particular, the snap element 200 extends through the installation cavity 102 and interacts with the first bayonet 103 on the side wall of the installation cavity 102 to facilitate a convenient connection of the mounting frame 2 to the base 1 and to limit the movement of the mounting frame 2 in the Z-direction. The limiting element 210 rests against the inner wall of the receiving cavity 101 to limit the movement of the mounting frame 2 in the Y-direction when its movement in the Z-direction is limited. This reduces vibration of the connector under vibration, shock, and other operating conditions of the module and improves the reliability of the engagement of the first voltage assembly 4 located in the receiving section 100.

[0030] It should be noted that the number of installation cavities 102 is optionally two, and the two installation cavities 102 are arranged symmetrically on both sides of the receiving cavity 101.

[0031] Optionally, the mounting frame 2 further comprises a connecting plate 220 for connecting the limiting element 210 to the snap element 200. The snap element 200 comprises a first extension 201 connected to the underside of the connecting plate 220 and a first snap lock 202 arranged on the first extension 201 to interact with the first bayonet 103. The limiting element 210 comprises a first side plate 211 connected to the underside of the connecting plate 220 and a limiting plate 212 arranged below the first side plate 211, the limiting plate 212 being used to bear against the inner wall of the receiving cavity 101.

[0032] In particular, during the installation of the mounting frame 2 in the installation cavity 102, the first snap lock 202, which is arranged on the first extension 201, is connected to the first bayonet 103 inside the installation cavity 102, thus connecting the mounting frame 2 to the interior of the installation cavity 102. At this point, the limiting plate 212 rests against the inner wall of the receiving cavity 101 below the first side plate 211 to limit the positions of the mounting frame 2 in the Z and Y directions. At this point, the first side plate 211 rests against the side wall of the low-voltage connector 400 facing away from the reinforcement plate 420, which in turn limits the movement of the first voltage assembly 4 in the Y direction within the receiving cavity 101.Furthermore, the boundary plate 212 is firmly connected to the underside of the first side plate 211, and the thickness of the boundary plate 212 along the Y-direction is less than the thickness of the first side plate 211 along the Y-direction, so that the first side plate 211 is located above the side wall of the receiving cavity and rests against the top of the side wall of the receiving cavity, which can further reduce the vibration of the connector under vibration, shock and other operating conditions of the module.

[0033] It should be noted that a gap is formed between the snap element 200 and the limiting element 210, so that when the snap element 200 is connected to the installation cavity 102, the limiting element 210 is able to extend into the receiving cavity and rest against the side wall of the receiving cavity.

[0034] It should be noted that the mounting frame 2 further comprises a reinforcing bar 230, with two connecting plates 220 being connected to the ends of one side of the reinforcing bar 230, and the two connecting plates 220 being spaced apart from each other. Accordingly, there are two installation cavities 102, and the two installation cavities 102 are arranged symmetrically on both sides of the receiving cavity 101. In addition, the connecting plate 220 is formed integrally with the first cantilever 201 and the first side plate 211, while a second side plate 240 is also provided on the side of the first cantilever 201 facing away from the receiving cavity, and the second side plate 240 is used to abut the inner wall of the installation cavity 102.The second side plate 240 extends in the same direction as the first boom 201, and the length of the second side plate 240 is greater than the length of the first boom 201 to prevent the first carabiner 202 from breaking under force during and / or after insertion into the base 1.

[0035] Optionally, the ratio between the length of the first cantilever 201 and the thickness of the first cantilever 201 can be at least 5:1. This ensures that the first cantilever 201 can deform sufficiently to prevent it from breaking when the first snap lock 202 on the first cantilever 201 engages with the first bayonet 103 in the installation cavity 102.

[0036] It should be noted that the angle between the underside of the first snap lock 202 and the first extension 201 should be less than or equal to 45° to facilitate insertion of the first snap lock 202 into the first bayonet 103 of the installation cavity 102.

[0037] Optional, as in Fig. As shown in Figure 3, a protective cover 3 is also provided, which is used to snap onto the first voltage assembly 4. The protective cover 3 serves to prevent further risks, such as damage to the first voltage assembly 4 caused by foreign objects falling into the first voltage assembly 4 during assembly, transport or installation, and can fulfill the protection requirements of the first voltage assembly 4.

[0038] Optional, as in Fig. As shown in Figures 3 to 4, the protective cover 3 comprises a second extension 320 and a main body 300, the second extension 320 being connected to the main body 300 and extending along the thickness direction of the main body 300. The ratio of the length of the second extension 320 to the wall thickness of the second extension 320 is greater than or equal to 5:1, and a second snap lock 330 is arranged at a first end of the second extension 320. Accordingly, the low-voltage connector is provided with a second bayonet 431, the second bayonet 431 interacting with the second snap lock 330. In this way, it can be ensured that a sufficiently large deformation can occur in the second boom 320 to make it easier for the second snap lock 330 to detach from or snap into the second bayonet 431, and that it is not easy to break.

[0039] Optional, as in Fig. As shown in Figure 3, the protective cover 3 further comprises a guide column 310 connected to the main body 300, the guide column 310 extending along the thickness direction of the main body 300. One end of the guide column 310 is located on the same side of the main body 300 as the first end of the second boom 320, and the guide column 310 is arranged parallel to the second boom 320. In this way, the guide column 310 can serve as a guide for the protective cover 3 during assembly.

[0040] Optionally, the number of guide columns can be 310, as shown in Fig. 3 shown, two amount to, and two of the guide columns 310 are arranged on both sides of the second boom 320, which can improve the guiding effect of the guide columns 310.

[0041] Optional, as in Fig. As shown in Figure 3, the second end of the second boom 320 extends outside the main body 300 along the thickness direction of the main body 300, which facilitates the assembly or disassembly of the protective cover 3.

[0042] Optional, as in Fig. As shown in Figure 3, the main body 300 is provided with an opening groove 301 along its thickness direction, and the second extension 320 passes through the opening groove 301. The opening groove 301 is arranged to facilitate the rotation of the second extension 320, which in turn is advantageous for the interaction between the protective cover 3 and the low-voltage connector, and is conveniently visible during assembly or disassembly, thus enabling quick assembly or disassembly of the protective cover 3.

[0043] Optionally, the protective cover 3 comprises a main body 300, a guide column 310 connected to the underside of the main body 300, an opening groove 301 arranged along the thickness direction of the main body 300, a second extension 320 arranged in the opening groove 301, and a second snap lock 330 connected to the second extension 320. There are two guide columns 310, located on either side of the opening groove 301, with the guide columns 310 extending in a direction away from the main body 300, and the second extension 320 arranged parallel to the guide columns 310.

[0044] Optionally, the guide column 310 below the main body 300, from a spaced section between the two connecting plates 220, interacts with the low-voltage connector to completely cover the space above the low-voltage connector and prevent dirt, water droplets, etc., from penetrating it. The protective cover can also be formed as a single unit with the mounting frame, etc., but is not limited to this.

[0045] In particular, the ratio between the length of the second extension 320 of the protective cover 3 and the wall thickness of the second extension 320 is, in principle, greater than or equal to 5:1 to ensure that the second extension 320 has a sufficiently large deformation to detach from the first tension assembly 4 when pressure is applied with a finger. The protective cover 3 is provided with a guide column 310, since the direction of extension of the guide column 310 is the same as the direction of extension of the second extension 320 (both extend in the Z-direction), and the length of the guide column 310 is greater than the length of the second extension 320 (i.e., the lower surface of the guide column 310 is much lower than the lower surface of the second snap lock 330 along the Z-direction).And the guide column 310 has a sufficiently strong structure so that it can serve as a movement guide when the protective cover 3 is assembled, and prevents the second snap lock 330 from breaking off when inserted.

[0046] It should be noted that the guide column 310 is inserted directly into the connecting groove 430 within the first tension assembly 4, and the movement of the protective cover 3 in the X and Y directions can be limited by the transition fit with the connecting groove 430 of the first tension assembly 4.

[0047] The present application further provides a battery module comprising the above-mentioned protection assembly for a battery module. Optionally, the present application further comprises a low-voltage connector, a positive electrode lead end and / or a negative electrode lead end of the current busbar, wherein the low-voltage connector is arranged on the same side of the battery module as the positive electrode lead end and / or the negative electrode lead end. The advantageous effect of the battery module is the same as the effect of the protection assembly for a battery module and is not repeated.

[0048] Naturally, a person skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its technical equivalents, the present invention shall also encompass these modifications and variations. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] Connector protection assembly and battery module”, which was published on April 30, 2020

[0001]

Claims

[1] Protection assembly for a battery module, characterized by that it comprises a base and a boundary element; wherein the base is used for arranging a low-voltage connector and for arranging a positive electrode lead end and / or a negative electrode lead end of a current busbar located on the same side of the battery module as the low-voltage connector; wherein the base comprises a receiving cavity and an installation cavity, the receiving cavity being used to accommodate the low-voltage connector; wherein the receiving cavity comprises a side wall, wherein the side wall of the receiving cavity is arranged between the installation cavity and the receiving cavity; the installation cavity is firmly connected to the limiting element to restrict movement of the low-voltage connector. [2] Protective assembly according to claim 1, characterized by that the limiting element rests against the side wall of the receiving cavity. [3] Protective assembly according to claim 2, characterized by , that the limiting element is located above the side wall of the receiving cavity in order to abut the side wall of the receiving cavity. [4] Protective assembly according to claim 1 or 2 or 3, characterized by that the side wall of the recording cavity consists of an insulating material. [5] Protective assembly according to any one of claims 1 to 4, characterized by , that the receiving cavity is used for snapping in with the low-voltage connector to accommodate the low-voltage connector. [6] Protective assembly according to any one of claims 1 to 5, characterized by that a frame is arranged in the recording cavity. [7] Protective assembly according to claim 6, characterized by, that a bottom surface of the low-voltage connector rests against the frame when the low-voltage connector is arranged in the receiving cavity. [8] Protective assembly according to any one of claims 1 to 7, characterized by that the base comprises a first opening arranged according to the low-voltage connector, wherein the limiting element covers at least part of the first opening to limit the movement of the low-voltage connector. [9] Protective assembly according to any one of claims 1 to 7, characterized by that the base includes a first opening, the first opening being connected to the receiving cavity. [10] Protective assembly according to claim 8 or 9, characterized by, that the first opening is used for the movement of the low-voltage connector in a first direction to move the low-voltage connector into the receiving cavity, or to move the low-voltage connector in a direction opposite to the first direction, so that the low-voltage connector moves out of the receiving cavity. [11] Protective assembly according to any one of claims 1 to 10, characterized by that the side wall of the low-voltage connector rests against the side wall of the receiving cavity facing the installation cavity. [12] Protective assembly according to any one of claims 1 to 11, characterized by , that the side wall of the receiving cavity is provided with a first bayonet, wherein the limiting element is connected to the installation cavity by the first bayonet. [13] Protective assembly according to claim 12, characterized bythat the protective assembly further comprises a snap element, wherein the snap element is connected to the limiting element, and wherein the snap element interacts with the first bayonet to achieve a connection between the limiting element and the installation cavity. [14] Protective assembly according to claim 13, characterized by that the snap element is guided through the installation cavity. [15] Protective assembly according to claim 13 or 14, characterized by that the snap element includes a first extension. [16] Protective assembly according to claim 15, characterized by , that the snap element further comprises a first snap lock arranged on the first extension, the first snap lock being used to interact with the first bayonet. [17] Protective assembly according to claim 15 or 16, characterized bythat the ratio between the length of the first boom and the thickness of the first boom is not less than 5:

1. [18] Protective assembly according to claim 16 or 17, characterized by that the angle between the underside of the first snap lock and the first extension is less than or equal to 45°. [19] Protective assembly according to any one of claims 1 to 18, characterized by that the number of installation cavities is two. [20] Protective assembly according to claim 19, characterized by that the two installation cavities are arranged symmetrically on both sides of the receiving cavity. [21] Protective assembly according to any one of claims 1 to 20, characterized by , that the base further comprises support sections, wherein the support sections are used to arrange the positive electrode lead end and / or the negative electrode lead end of the current busbar of the battery module. [22] Protective assembly according to claim 21, characterized by , that the installation cavity is used to separate the positive electrode lead end and / or the negative electrode lead end of the current busbar of the battery module, which is / are located on the support section, from the low-voltage connector located in the receiving cavity. [23] Protective assembly according to claim 22, characterized by that the number of support sections is two. [24] Protective assembly according to claim 23, characterized by , that the two support sections are each used to arrange the positive electrode lead end and the negative electrode lead end of the current busbar of the battery module. [25] Protective assembly according to claim 23 or 24, characterized by that the receiving cavity is located between the two support sections. [26] Protective assembly according to claim 25, characterized bythat the installation cavity is located between the two support sections. [27] Protective assembly according to one of claims 21 to 26, characterized by , that the base further comprises a separating section, wherein the separating section is located between the support section and the receiving cavity and is used to separate the low-voltage connector from the positive electrode lead end, and / or to separate the low-voltage connector from the negative electrode lead end. [28] Protective assembly according to claim 27, characterized by that the separation section includes separation cavities. [29] Protective assembly according to claim 28, characterized by that the number of separating cavities is two. [30] Protective assembly according to claim 29, characterized by that the separating cavities are arranged between the two support sections and the receiving cavity. [31] Protective assembly according to one of claims 27 to 30, characterized bythat the installation cavity is located between the separation section and the receiving cavity. [32] Protective assembly according to one of claims 27 to 31, characterized by that the separation section includes the side wall of the receiving cavity. [33] Protective assembly according to one of claims 27 to 32, characterized by that the separation section consists of an insulating material. [34] Protective assembly according to claim 27, characterized by that the receiving cavity, the installation cavities, both support sections and the separation section are formed in one piece. [35] Protective assembly according to any one of claims 1 to 34, characterized by , that the base is provided with a support surface in an X direction, the support surface being used for placing the positive electrode lead end and the negative electrode lead end of the current busbar of the battery module. [36] Protective assembly according to claim 8 or 9, characterized by , that the limiting element comprises a first side plate, wherein the first side plate covers the first opening of the base. [37] Protective assembly according to claim 36, characterized by , that the limiting element comprises a limiting plate, wherein the limiting plate is arranged below the first side plate. [38] Protective assembly according to claim 37, characterized by that the boundary plate is firmly connected to the underside of the first side plate. [39] Protective assembly according to any one of claims 1 to 38, characterized by , that the low-voltage connector is used to transmit a signal from the battery module to a battery management system. [40] Battery module comprising a protection assembly according to any one of claims 1 to 39. [41] Battery module according to claim 40, characterized bythat the battery module comprises a first voltage assembly and a second voltage assembly, wherein the first voltage assembly comprises the low-voltage connector, and wherein the second voltage assembly comprises the positive electrode lead end and / or the negative electrode lead end of the current busbar of the battery module. [42] Battery module according to claim 40 or 41, characterized by that the low-voltage connector is located in the receiving cavity of the protective assembly. [43] Battery module according to claim 41 or 42, characterized by that the positive electrode lead end and / or the negative electrode lead end of the current busbar are / is located in the support section of the protection assembly. [44] Battery module according to any one of claims 40 to 43, characterized bythat the battery module comprises an FPC assembly, wherein the FPC assembly collects signals of at least one of the voltage and temperature of the battery by means of a nickel foil and transmits the collected signals of at least one of the voltage and temperature to the low-voltage connector. [45] Battery module according to claim 43, characterized by , that the battery module further comprises a reinforcement plate, wherein the limiting element of the protective assembly comprises a first side plate, the first side plate being abutted against a side wall on a side of the low-voltage connector facing away from the reinforcement plate.

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