Circuit board assembly, battery pack and energy storage system

Abstract

The utility model discloses a circuit board assembly, a battery pack and an energy storage system, and belongs to the technical field of energy storage, the circuit board assembly is used for being arranged in the battery pack, the circuit board assembly comprises a mounting box, a circuit board body, a wire harness and a wire harness sealing cover, and the mounting box is provided with a containing cavity and a wire arrangement hole communicated with the containing cavity; the circuit board body is arranged in the accommodating cavity; the wire harness is connected with the circuit board body and penetrates through the flat cable hole; the wire harness sealing cover comprises a first body and a sealing part, the first body is in sealing connection with the mounting box and covers and seals the flat cable hole, the first body is provided with a first sealing groove, the first sealing groove is communicated with the flat cable hole, the first body is further provided with a wire harness hole communicated with the first sealing groove and the flat cable hole, and the wire harness penetrates through the flat cable hole, the wire harness hole and the first sealing groove; the sealing part is arranged in the first sealing groove and covers and seals the wire harness hole; the wire harness sealing cover seals the flat cable hole, and the sealing part seals the wire harness hole, so that the sealing performance of the operation environment of the circuit board is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of energy storage, and particularly relates to a circuit board assembly, a battery pack, and an energy storage system. Background Art

[0002] Currently, for the sealing of the circuit board in the battery pack, the circuit board cannot be effectively protected to ensure that the circuit board always has good working performance. For example, when a single battery in the battery pack undergoes thermal runaway, it may cause high temperature, which increases the risk of burning of the components, circuits, and solder joints on the circuit board. Summary of the Utility Model

[0003] In view of this, this application has developed a circuit board assembly, a battery pack, and an energy storage system for electrical equipment.

[0004] Technical Solution: An embodiment of this application provides a circuit board assembly. The circuit board assembly is configured to be disposed in a battery pack, and the circuit board assembly includes:

[0005] An installation box having a receiving cavity and a wiring hole communicating with the receiving cavity;

[0006] A circuit board body disposed in the receiving cavity;

[0007] A wiring harness connected to the circuit board body and passing through the wiring hole;

[0008] A wiring harness sealing cover including a first body and a sealing portion. The first body is sealingly connected to the installation box and covers the wiring hole. The first body is provided with a first sealing groove communicating with the wiring hole. The first body is further provided with a wiring harness hole communicating the first sealing groove and the wiring hole. The wiring harness passes through the wiring hole, the wiring harness hole, and the first sealing groove. The sealing portion is disposed in the first sealing groove and covers the wiring harness hole.

[0009] In some embodiments, it includes a first sealing ring. The first sealing ring is disposed around the wiring hole, and the wiring harness sealing cover is sealingly connected to the installation box through the first sealing ring.

[0010] In some embodiments, the wiring harness sealing cover has a second sealing groove. The second sealing groove is disposed on the side of the wiring harness sealing cover facing the installation box, and the first sealing ring is embedded in the second sealing groove.

[0011] In some embodiments, it includes a first connecting portion. The first connecting portion is disposed around the assembly port and connected to the installation box. The installation box is sealingly connected to the cover body through the first connecting portion.

[0012] In some embodiments, the first connecting portion includes:

[0013] A second body disposed around the assembly port and connected to the installation box;

[0014] The second sealing ring is arranged around the assembly port, and the second body is hermetically connected to the installation box through the second sealing ring.

[0015] In some embodiments, the first connecting portion has a third sealing groove, and the second sealing ring is embedded in the third sealing groove.

[0016] In some embodiments, the first connecting portion further includes at least one rib, the rib is connected to the second body, and the rib is arranged in the third sealing groove.

[0017] In some embodiments, the gap between the wire harness hole and the wire harness is 0.1 - 1 mm.

[0018] Correspondingly, a battery pack described in an embodiment of the present application includes the above-mentioned circuit board assembly.

[0019] Correspondingly, an energy storage system described in an embodiment of the present application includes the above-mentioned circuit board assembly, or includes the above-mentioned battery pack.

[0020] One of the beneficial effects of multiple embodiments of the present application is as follows: A circuit board assembly is provided. The circuit board assembly is arranged in a battery pack and includes an installation box, a circuit board body, a wire harness, and a wire harness sealing cover. The installation box has a receiving cavity and a wire arranging hole communicating with the receiving cavity; the circuit board body is arranged in the receiving cavity; the wire harness is connected to the circuit board body and passes through the wire arranging hole; the wire harness sealing cover includes a first body and a sealing portion. The first body is hermetically connected to the installation box and covers the wire arranging hole. The first body is provided with a first sealing groove, the first sealing groove communicates with the wire arranging hole, the first body is further provided with a wire harness hole communicating the first sealing groove and the wire arranging hole, the wire harness passes through the wire arranging hole, the wire harness hole, and the first sealing groove, and the sealing portion is arranged in the first sealing groove and covers the wire harness hole; the present application separately seals the circuit board in the battery pack, thereby ensuring the tightness of the operating environment of the circuit board. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is an exploded view of the overall structure of the circuit board assembly provided by the embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the positional relationship between the wire harness sealing cover and the wire harness provided by the embodiment of the present application;

[0024] Figure 3The cross-sectional structure diagram of the wire harness sealing cover and the wire harness provided by the embodiment of the present application;

[0025] Figure 4 The overall structure diagram of the wire harness sealing cover provided by the embodiment of the present application;

[0026] Figure 5 The schematic diagram of the position where the wire harness holes are provided in the embodiment of the present application;

[0027] Figure 6 The schematic diagram of the position where the ribs are provided in the embodiment of the present application;

[0028] Figure 7 The overall structure schematic diagram of the mounting box provided by the embodiment of the present application;

[0029] Figure 8 The overall structure cross-section of the circuit board assembly provided by the embodiment of the present application;

[0030] Figure 9 The schematic diagram of the position of the circuit board assembly in the battery pack provided by the embodiment of the present application.

[0031] Reference numerals:

[0032] 100 - mounting box; 110 - accommodation cavity; 120 - wire arranging hole; 130 - assembly port; 200 - circuit board body; 300 - wire harness; 4,00 - wire harness sealing cover; 410 - first body; 411 - first sealing groove; 412 - wire harness hole; 420 - sealing part; 430 - second sealing groove; 500 - first sealing ring; 600 - cover body; 700 - first connecting part; 7,10 - second body; 720 - second sealing ring; 730 - third sealing groove; 740 - rib; 800 - battery pack. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0034] It should be understood that although terms such as first and second may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component described below may be referred to as the second component without departing from the teachings of the concept of the present application. As used herein, the term "and / or" includes any one of the associated listed items and all combinations of one or more of them.

[0035] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes in the accompanying drawings are not necessarily essential for implementing the present application, and thus cannot be used to limit the protection scope of the present application.

[0036] Currently, the energy storage products on the market generally adopt the method of integrally sealing the circuit board and the battery together. However, there are some problems with this integral sealing method. One of them is that the circuit board cannot be effectively protected. When the battery undergoes thermal runaway, it may lead to high temperatures, which increases the risk of burning the components, circuits, and solder joints on the circuit board, posing a threat to the reliability and safety of the energy storage product. In addition, the circuit board, as a vulnerable component in the energy storage product, needs to be maintained or replaced. However, the overall sealing solution has poor maintenance convenience, and the entire energy storage product needs to be disassembled to perform the maintenance work on the circuit board. This not only increases the complexity of maintenance but also may cause damage or loss of other components.

[0037] In view of this, the embodiments of the present application provide a circuit board assembly, which separately seals the circuit board in the battery pack 800 to solve at least part of the above technical problems.

[0038] Please refer to Figure 1 、 Figure 5 and Figure 7 , Figure 1 which is an exploded view of the overall structure of a circuit board assembly provided by the embodiments of the present application, Figure 5 which is a schematic diagram of the position where the wire harness hole is provided in the embodiments of the present application, Figure 7Schematic diagram of the overall structure of the installation box provided by the embodiment of the present application. The circuit board assembly is used to be arranged in the battery pack 800. The circuit board assembly includes an installation box 100, a circuit board body 200, a wire harness 300, and a wire harness sealing cover 400. The installation box 100 has a receiving cavity 110 and a wire routing hole 120 communicating with the receiving cavity 110. The circuit board body 200 is arranged in the receiving cavity 110. The wire harness 300 is connected to the circuit board body 200 and passes through the wire routing hole 120. The wire harness sealing cover 400 includes a first body 410 and a sealing portion 420. The first body 410 is hermetically connected to the installation box 100 and covers the wire routing hole 120. The first body 410 is provided with a first sealing groove 411. The first sealing groove 411 communicates with the wire routing hole 120. The first body 410 is further provided with a wire harness hole 412 communicating the first sealing groove 411 and the wire routing hole 120. The wire harness 300 passes through the wire routing hole 120, the wire harness hole 412, and the first sealing groove 411. The sealing portion 420 is arranged in the first sealing groove 411 and covers the wire harness hole 412. In this embodiment, the installation box 100 seals the circuit board body 200, the wire harness sealing cover 400 covers the wire routing hole 120 through which the wire harness 300 passes, and combined with the sealing portion 420 to seal the first sealing groove 411 through which the wire harness 300 passes, so as to realize the separate sealing of the whole circuit board body 200. The method of separately sealing the circuit board is adopted to solve the problem of poor protection performance of the circuit board caused by overall sealing. At the same time, due to the existence of the wire harness sealing cover 400, not only the sealing of the first sealing groove 411 is realized, but also the wire harness 300 can be detached after installation; by releasing the sealing connection between the wire harness sealing cover 400 and the installation box 100, the wire harness 300 can be detached. The design scheme of the circuit board assembly in this embodiment not only ensures the effective protection of the circuit board body 200, but also improves the maintenance convenience of the wire harness 300, providing better guarantee for the reliability and safety of energy storage products.

[0039] Specifically, the number of the wire harnesses 300 is determined by the installation requirements of the circuit board body 200. Assume that the number of the wire routing holes 120 is m, and the number of the wire harnesses 300 is n. The relationship between the number of the wire routing holes 120 and the number of the wire harnesses 300 is as follows: the number of the wire routing holes 120 is the same as the number of the wire harnesses 300, that is, m = n; or the number of the wire routing holes 120 is greater than 1 and less than the number of the wire harnesses 300, that is, 1 < m < n; or the number of the wire routing holes 120 is 1, that is, m = 1 and n is not limited. When m = n, it means that each wire routing hole 120 corresponds to the passing out of one wire harness 300. When 1 < m < n, it means that all the wire harnesses 300 are divided into m groups of wire harness groups. The number of the wire harnesses 300 in each group of wire harness groups can be the same or different, and each wire routing hole 120 allows the wire harnesses 300 in the corresponding wire harness group to pass out. When m = 1 and n is not limited, one wire routing hole 120 allows all the wire harnesses 300 to pass out.

[0040] Specifically, assume that the number of the first sealing grooves 411 is i. The following are the cases regarding the set number of the first sealing grooves 411:

[0041] One first sealing groove 411 can be provided, that is, i = 1, and the first sealing groove 411 surrounds all the wire harnesses 300. When the number n of the wire harnesses 300 is 4, the four wire harnesses 300 are respectively denoted as the first wire harness, the second wire harness, the third wire harness, and the fourth wire harness, and when the number i of the first sealing grooves 411 is 1, the first sealing groove 411 surrounds the first wire harness, the second wire harness, the third wire harness, and the fourth wire harness.

[0042] Alternatively, one first sealing groove 411 can be provided around each wire harness 300, that is, the set number of the first sealing grooves 411 is the same as the set number of the wire harnesses 300, namely i = n. When the number n of the wire harnesses 300 is 4, the four wire harnesses 300 are respectively denoted as the first wire harness, the second wire harness, the third wire harness, and the fourth wire harness, and when the number i of the first sealing grooves 411 is i = n, one first sealing groove 411 is respectively provided around the first wire harness, the second wire harness, the third wire harness, and the fourth wire harness for surrounding.

[0043] Alternatively, all the wire harnesses 300 can be divided into c groups of wire harness groups, where c satisfies 1 < c < i, and the number of wire harnesses 300 in each group of wire harness groups can be the same or different. When the number n of the wire harnesses 300 is 4, the four wire harnesses 300 are respectively denoted as the first wire harness, the second wire harness, the third wire harness, and the fourth wire harness, and when the number i of the first sealing grooves 411 is 3, one first sealing groove 411 surrounds the first wire harness and the second wire harness simultaneously, and the other wiring holes 120 are respectively surrounded by one first sealing groove 411 alone; or, one first sealing groove 411 surrounds the first wire harness and the third wire harness simultaneously, and the other wire harnesses 300 are respectively surrounded by one first sealing groove 411 alone; or, one first sealing groove 411 surrounds the first wire harness and the fourth wire harness simultaneously, and the other wire harnesses 300 are respectively surrounded by one first sealing groove 411 alone; or, one first sealing groove 411 surrounds the second wire harness and the third wire harness simultaneously, and the other wire harnesses 300 are respectively surrounded by one first sealing groove 411 alone; or, one first sealing groove 411 surrounds the second wire harness and the fourth wire harness simultaneously, and the other wire harnesses 300 are respectively surrounded by one first sealing groove 411 alone; or, one first sealing groove 411 surrounds the third wire harness and the fourth wire harness simultaneously, and the other wire harnesses 300 are respectively surrounded by one first sealing groove 411 alone. There are also various combinations for the set number of the first sealing grooves 411, which will not be elaborated one by one here.

[0044] In some embodiments, the mounting box 100 is an integrally formed structure, which is formed outside the circuit board body 200 by relying on the circuit board body 200, and the circuit board body 200 is surrounded inside the mounting box 100 to protect the circuit board body 200. When preparing, a wiring hole 120 for the wire harness 300 connected to the circuit board body 200 to pass through is reserved. The mounting box 100 is connected to the inner wall of the battery pack 800. When the circuit board body 200 needs to be replaced, the wire harness 300 is disassembled through the wiring hole 120, and then the mounting box 100 is removed from the inner wall of the battery pack 800 and then replaced. When the circuit board 200 needs to be repaired, the mounting box 100 needs to be removed from the inner wall of the battery pack 800, that is, when the mounting box 100 is scrapped, a new mounting box 100 needs to be prepared. This embodiment not only realizes the separate sealing of the circuit board body 200 to ensure the effective protection of the circuit board body 200, improves the maintenance convenience of the wire harness 300, but also can realize the replacement and disassembly of the circuit board body 200.

[0045] In some embodiments, when the mounting box 100 is an integrally formed structure, it can be used alone to seal the circuit board body 200. That is, the mounting box 100 provided with the circuit board body 200 is installed in the battery pack 800. It can also be that the mounting box 100 has an assembly port 130 communicating with the accommodation cavity 110, and the circuit board body 200 is arranged in the accommodation cavity 110, and the mounting box 100 is hermetically connected to the battery pack 800. That is, the structure of the battery pack 800 itself is used to connect with the mounting box 100 to realize the sealing of the circuit board body 200. In this embodiment, the sealing form of the circuit board body 200 is not specifically limited, as long as the circuit board body 200 is arranged in the accommodation cavity 110 of the mounting box 100.

[0046] In some embodiments, please refer to Figure 1 and Figure 8 , Figure 8This is a cross-sectional view of the overall structure of the circuit board assembly provided by the embodiment of the present application. The mounting box 100 is connected to the inner wall of the battery pack 800. The mounting box 100 has an assembly port 130 communicating with the accommodation cavity 110. The circuit board assembly further includes a cover body 600, and the cover body 600 is hermetically connected to the mounting box 100 and covers the assembly port 130. That is, the mounting box 100 is of a split structure. The circuit board body 200 is disposed in the accommodation cavity 110, and then the cover body 600 is hermetically connected to the mounting box 100 to achieve the sealing of the circuit board body 200. When the circuit board body 200 needs to be replaced or repaired, in this embodiment, the wire harness 300 is disassembled through the wire arrangement hole 120, and then the connection between the cover body 600 and the mounting box 100 is released, so that the circuit board body 200 can be taken out from the accommodation cavity 110 to replace or repair the circuit board body 200. This embodiment not only realizes the individual sealing of the circuit board body 200 to ensure the effective protection of the circuit board body 200, improves the maintenance convenience of the wire harness 300, but also can more conveniently replace and disassemble the circuit board body 200, and at the same time, the mounting box 100 can be reused.

[0047] It should be noted that the connection between the mounting box 100 and the inner wall of the battery pack 800 can be that the cover body 600 is connected to the battery pack 800, or the mounting box 100 is connected to the battery pack 800, or the cover body 600 is the cover plate of the battery pack 800, which can cover and seal the battery pack 800 while covering and sealing the mounting box 100 (please refer to Figure 9 , Figure 9 the schematic diagram of the position of the circuit board assembly provided by the embodiment of the present application in the battery pack). No specific limitation is made here.

[0048] Specifically, the assembly port 130 can be expressed as the opening part located on the upper surface of the mounting box 100. Of course, it can also be the opening part on other surfaces of the mounting box 100. It should be noted that when looking down at the assembly port 130, its opening shape can be rectangular or circular, and no limitation is made here.

[0049] In some embodiments, please refer to Figure 2 and Figure 3 , Figure 2 the schematic diagram of the positional relationship between the wire harness sealing cover and the wire harness provided by the embodiment of the present application, Figure 3A cross-sectional structural diagram of the wiring harness sealing cover and wiring harness provided in an embodiment of the present application. A circle of protrusions is provided on the side of the first body 410 away from the installation box 100 to enclose a first sealing groove 411. The sealing portion 420 is a sealing structure formed after the sealant is poured into the first sealing groove 411 and solidified, and the wiring harness hole 412 is sealed by the sealing portion 420. It should be noted that the first sealing groove 411 is a full circle and uninterrupted groove in the middle, so that the sealing portion 420 can form a complete sealing structure in the first sealing groove 411. The sealant can be glass glue, silicone rubber, etc., and there is no restriction on this in this embodiment, as long as it can form a waterproof and airtight sealing structure after solidification.

[0050] In some embodiments, the gap between the harness hole 412 and the harness 300 is 0.1-1 mm. This embodiment requires that the sealant cannot flow into the installation box 100 from the gap between the harness hole 412 and the harness 300. This can be achieved by disposing the corresponding sealant according to the gap before filling.

[0051] In some embodiments, see Figure 1 The circuit board assembly includes a first sealing ring 500, which is arranged around the cable hole 120. The harness sealing cover 400 is sealed and connected to the installation box 100 through the first sealing ring 500. It should be noted that, it is assumed that the number of the first sealing rings 500 is a.

[0052] A first sealing ring 500 can be provided, i.e., a=1, and the first sealing ring 500 surrounds all cable holes 120. When the number m of cable holes 120 provided is 4, the four cable holes 120 are respectively designated as the first cable hole, the second cable hole, the third cable hole, and the fourth cable hole. When the number a of the first sealing ring 500 provided is 1, the first sealing ring 500 surrounds the first, second, third, and fourth cable holes.

[0053] Alternatively, a first sealing ring 500 may be disposed around each cable routing hole 120, i.e., the number of first sealing rings 500 provided is the same as the number of cable routing holes 120 provided, that is, a = m. When the number of cable routing holes 120 provided is m = 4, and the four cable routing holes 120 are respectively designated as the first cable routing hole, the second cable routing hole, the third cable routing hole, and the fourth cable routing hole, and the number of first sealing rings 500 provided is a = m, a first sealing ring 500 is respectively disposed around the first cable routing hole, the second cable routing hole, the third cable routing hole, and the fourth cable routing hole.

[0054] Alternatively, all the wire arrangement holes 120 can be divided into b groups of wire arrangement hole groups, where b satisfies 1 < b < a, and the number of wire arrangement holes 120 in each group of wire arrangement hole groups can be the same or different. When the set number m of the wire arrangement holes 120 is 4, the four wire arrangement holes 120 are respectively denoted as the first wire arrangement hole, the second wire arrangement hole, the third wire arrangement hole, and the fourth wire arrangement hole, and when the set number a of the first sealing rings 500 is 3, one first sealing ring 500 simultaneously surrounds the first wire arrangement hole and the second wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone; or, one first sealing ring 500 simultaneously surrounds the first wire arrangement hole and the third wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone; or, one first sealing ring 500 simultaneously surrounds the first wire arrangement hole and the fourth wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone; or, one first sealing ring 500 simultaneously surrounds the second wire arrangement hole and the third wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone; or, one first sealing ring 500 simultaneously surrounds the second wire arrangement hole and the fourth wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone; or, one first sealing ring 500 simultaneously surrounds the third wire arrangement hole and the fourth wire arrangement hole, and the other wire arrangement holes 120 are each surrounded by one first sealing ring 500 alone. There are also various combinations for the set number of the first sealing rings 500, which will not be elaborated one by one here. That is, in this embodiment, the wire arrangement holes 120 are sealed by the first sealing rings 500.

[0055] In some embodiments, please refer to Figure 4 , Figure 4 , which is the overall structure diagram of the wire harness sealing cover provided by the embodiment of the present application. The wire harness sealing cover 400 has a second sealing groove 430, and the second sealing groove 430 is arranged on the side of the wire harness sealing cover 400 facing the mounting box 100, and the first sealing ring 500 is embedded in the second sealing groove 430. It should be noted that the set number of the second sealing grooves 430 is the same as the set number of the first sealing rings 500, and the set position of the second sealing grooves 430 corresponds to the installation position of the first sealing rings 500. When the first sealing ring 500 is pressed between the second sealing groove 430 and the mounting box 100, the sealing between the wire harness sealing cover 400 and the mounting box 100 is realized, and then the connection between the wire harness sealing cover 400 and the mounting box 100 is realized by using fasteners, so as to achieve the purpose of sealed connection. In this embodiment, the second sealing groove 430 limits the installation position of the first sealing ring 500, which is convenient for installation and has a better sealing effect.

[0056] In some embodiments, the circuit board assembly further includes a first connecting portion 700. The first connecting portion 700 is disposed around the assembly opening 130 and connected to the mounting box 100. The mounting box 100 is hermetically connected to the cover body 600 through the first connecting portion 700.

[0057] Specifically, the first connecting portion 700 includes a second body 710 and a second sealing ring 720. The second body 710 is disposed around the assembly opening 130 and connected to the mounting box 100. The second sealing ring 720 is disposed around the assembly opening 130. The second body 710 is hermetically connected to the mounting box 100 through the second sealing ring 720. The first connecting portion 700 has a third sealing groove 730, and the second sealing ring 720 is embedded in the third sealing groove 730. When the second sealing ring 720 is press-fitted between the second body 710 and the cover body 600, the sealing between the first connecting portion 700 and the cover body 600 is achieved. Then, fasteners are used to connect the first connecting portion 700 and the cover body 600. In this embodiment, by embedding the second sealing ring 720 in the third sealing groove 730, the sealing between the mounting box 100 and the cover body 600 is achieved, and fasteners are used to connect the mounting box 100 and the cover body 600, so as to achieve the purpose of hermetic connection.

[0058] In some embodiments, please refer to Figure 6 , Figure 6 which is a schematic diagram of the position where the rib provided in the embodiment of the present application is located. The first connecting portion 700 further includes at least one rib 740. The rib 740 is connected to the second body 710 and is disposed in the third sealing groove 730. The rib 740 may be a circular convex structure disposed around the assembly opening 130. It should be noted that when the first connecting portion 700 is hermetically connected to the cover body 600, the second sealing ring 720 is pressed on the rib 740 and covers the entire third sealing groove 730. In this embodiment, by providing the rib 740, the sealing between the first connecting portion 700 and the cover body 600 is better.

[0059] Correspondingly, a battery pack provided in an embodiment of the present application includes the circuit board assembly in the above embodiment. Therefore, the battery pack can have all the technical features and beneficial effects of the above circuit board assembly, which will not be elaborated herein.

[0060] Correspondingly, an energy storage system provided in an embodiment of the present application includes the circuit board assembly in any of the above embodiments, or includes the battery pack in the above embodiment. Therefore, it can have all the technical features and technical effects of the above circuit board assembly or battery pack, which will not be elaborated herein.

[0061] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0062] The above has introduced in detail the circuit board assembly, battery pack and energy storage system provided by the embodiments of the present application, and specific examples have been used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit board assembly, characterized in that, The circuit board assembly is used to be arranged in a battery pack (800), and the circuit board assembly includes: An installation box (100) having a receiving cavity (110) and a wire harness hole (120) communicating with the receiving cavity (110); A circuit board body (200) arranged in the receiving cavity (110); A wire harness (300), the wire harness (300) is connected to the circuit board body (200) and passes through the wire harness hole (120); A wire harness sealing cover (400), including a first body (410) and a sealing portion (420), the first body (410) is hermetically connected to the installation box (100) and covers the wire harness hole (120), the first body (410) is provided with a first sealing groove (411), the first sealing groove (411) communicates with the wire harness hole (120), the first body (410) is further provided with a wire harness hole (412) communicating the first sealing groove (411) and the wire harness hole (120), the wire harness (300) passes through the wire harness hole (120), the wire harness hole (412) and the first sealing groove (411), and the sealing portion (420) is arranged in the first sealing groove (411) and covers the wire harness hole (412).

2. The circuit board assembly according to claim 1, characterized in that, Including a first sealing ring (500), the first sealing ring (500) is arranged around the wire harness hole (120), and the wire harness sealing cover (400) is hermetically connected to the installation box (100) through the first sealing ring (500).

3. The circuit board assembly according to claim 2, wherein, The wire harness sealing cover (400) has a second sealing groove (430), the second sealing groove (430) is arranged on a side of the wire harness sealing cover (400) facing the installation box (100), and the first sealing ring (500) is embedded in the second sealing groove (430).

4. The circuit board assembly according to claim 1, wherein, The installation box (100) has an assembly port (130) communicating with the receiving cavity (110), and the circuit board assembly further includes: A cover body (600) hermetically connected to the installation box (100) and covering the assembly port (130).

5. The circuit board assembly according to claim 4, wherein, Including a first connecting portion (700), the first connecting portion (700) is arranged around the assembly port (130) and connected to the installation box (100), and the installation box (100) is hermetically connected to the cover body (600) through the first connecting portion (700).

6. The circuit board assembly according to claim 5, wherein, The first connecting portion (700) includes: A second body (710) arranged around the assembly port (130) and connected to the installation box (100); A second sealing ring (720) arranged around the assembly port (130), and the second body (710) is hermetically connected to the installation box (100) through the second sealing ring (720).

7. The circuit board assembly according to claim 6, wherein The first connecting portion (700) has a third sealing groove (730), and the second sealing ring (720) is embedded in the third sealing groove (730).

8. The circuit board assembly according to claim 7, wherein The first connecting portion (700) further includes at least one rib (740), the rib (740) is connected to the second body (710), and the rib (740) is disposed in the third sealing groove (730).

9. The circuit board assembly according to claim 1, characterized in that, The gap between the wire harness hole (412) and the wire harness (300) is 0.1 - 1 mm.

10. A battery pack, characterized in that, The battery pack (800) includes the circuit board assembly according to any one of claims 1 to 9.

11. An energy storage system, characterized in that, It includes the circuit board assembly according to any one of claims 1 to 9, or includes the battery pack according to claim 10.

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