Battery module and energy storage system

Abstract

The utility model discloses a battery module and an energy storage system, the battery module comprises a battery box, a battery cell group and a conductive assembly, and the battery cell group is mounted in the battery box; the conductive assembly comprises a plug connector and a plug-in matching piece, the plug connector is mounted on the battery box and provided with a first connecting part and a second connecting part, the first connecting part is located in the battery box, the second connecting part extends out of the battery box, the plug-in matching piece is mounted on the battery cell group and electrically connected with a busbar of the battery cell group, and the plug-in matching piece is electrically connected with the busbar of the battery cell group. The plug connector and the plug matching piece are arranged in an aligned mode, the first connecting part is connected with the plug matching piece in a plugged mode, and the second connecting part is used for being electrically connected with the output terminal. When the battery box and the battery cell group are assembled, the plug-in assembly of the plug-in piece and the plug-in fit is completed, the plug-in connection is good in stability, high in reliability and convenient to install and operate, and the plug-in piece extends out of the battery box and is convenient to connect with the output terminal.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery module and an energy storage system. Background Technology

[0002] A battery module is formed by connecting multiple individual battery cells in series and parallel. These modules, combined with a battery management system and other devices, ultimately form a complete energy storage system. The battery casing has positive and negative output terminals for drawing current. The positive output terminal connects to the positive busbar of the battery module, and the negative output terminal connects to the negative busbar. In related technologies, a connecting piece passes through the battery casing and is then secured to the positive and negative busbars with screws. This method is difficult to execute, the screws are prone to loosening and falling out, and the connection reliability is poor. Utility Model Content

[0003] This application provides a battery module and energy storage system to solve the problems of high operational difficulty and poor connection reliability in existing output terminals that are fixed to the busbar screws of the battery pack by connecting pieces.

[0004] In a first aspect, embodiments of this application provide a battery module, including:

[0005] Battery box;

[0006] The battery cell assembly is installed inside the battery box;

[0007] A conductive component includes a connector and a mating connector. The connector is mounted on the battery box and has a first connecting portion and a second connecting portion. The first connecting portion is located inside the battery box, and the second connecting portion extends outside the battery box. The mating connector is mounted on the battery cell assembly and is electrically connected to the busbar of the battery cell assembly. The connector and the mating connector are aligned and arranged. The first connecting portion is inserted into the mating connector, and the second connecting portion is used for electrical connection to an output terminal.

[0008] Optionally, the plug-in mating component includes a first elastic portion and a second elastic portion, the first elastic portion is connected to the second elastic portion, a plug-in gap is formed between the first elastic portion and the second elastic portion, the first connecting portion is located within the plug-in gap, and the first connecting portion is connected to the first elastic portion and the second elastic portion.

[0009] Optionally, both the first elastic portion and the second elastic portion include a connected vertical segment and a horizontal segment. The horizontal segments of the first elastic portion and the second elastic portion are fitted together and connected to the busbar. The vertical segments of the first elastic portion and the second elastic portion are spaced apart to form the insertion gap.

[0010] Optionally, the horizontal section is provided with a through hole.

[0011] Optionally, the mating component is magnetic.

[0012] Optionally, the battery box includes a bottom plate and an upper box, the bottom plate and the upper box are sealed together, the plug-in is installed on the side plate of the upper box opposite to the bottom plate, and the plug-in mating part is disposed on the side of the battery cell assembly away from the bottom plate.

[0013] Optionally, the base plate and the upper box are sealed together by a sealing element.

[0014] Optionally, the bottom plate has heat dissipation fins on one side away from the upper box.

[0015] And / or, a heat-conducting element is provided between the base plate and the battery cell assembly.

[0016] Secondly, embodiments of this application also provide an energy storage system, including the battery module described in any one of the above;

[0017] The housing contains the battery module, which is installed inside the housing. The housing is provided with an output terminal, which is connected to the second connection part.

[0018] Optionally, the bottom of the housing has an opening, and the bottom of the battery box is sealed to the housing around the opening.

[0019] The battery module and energy storage system provided in this application embodiment include a battery box, a cell assembly, and a conductive component. The cell assembly is installed inside the battery box. The conductive component includes a connector and a connector mating part. The connector is installed on the battery box. The first connecting part of the connector is inserted into the connector mating part, and the second connecting part of the connector extends outside the battery box and is electrically connected to the output terminal. The connector and connector mating part are connected during the assembly of the battery box and the cell assembly. The connector connection has good stability and high reliability, and is convenient for installation and operation. Furthermore, the connector extends outside the battery box, which facilitates connection to the output terminal. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0022] Figure 1 This is a three-dimensional schematic diagram of the battery module provided in the embodiments of this application.

[0023] Figure 2 This is a partial exploded view of the battery module provided in an embodiment of this application.

[0024] Figure 3 This is a partial exploded view of the battery cell assembly and the base plate in the battery module provided in the embodiments of this application.

[0025] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0026] Figure 5 This is a top view of the battery module provided in an embodiment of this application.

[0027] Figure 6 for Figure 5 BB section view.

[0028] Figure 7 for Figure 6 A magnified view of a section at point C.

[0029] Figure 8 This is a three-dimensional structural diagram of the energy storage system provided in an embodiment of this application.

[0030] Figure 9 An exploded view of an energy storage system provided in an embodiment of this application.

[0031] The labels in the diagram are:

[0032] 10. Battery module;

[0033] 100. Battery box; 110. Base plate; 111. Heat dissipation fins; 120. Upper box section; 130. Sealing element; 140. Heat-conducting element;

[0034] 200. Battery cell assembly; 210. Busbar; 220. Battery cell;

[0035] 300. Conductive component; 310. Connector; 310a. Positive connector; 310b. Negative connector; 311. First connecting part; 312. Second connecting part; 313. Stop part; 314. Snap-fit ​​protrusion; 315. Protective cover; 320. Connecting part; 320a. Positive connector; 320b. Negative connector; 321. First elastic part; 322. Second elastic part; 323. Connecting gap; 324. Vertical section; 325. Horizontal section; 326. Bending part; 327. Through hole;

[0036] 400. Fixing component; 410. End plate; 420. First fixing block; 430. Second fixing block; 440. Pin;

[0037] 20. Housing; 21. Output terminal; 22. Opening; 23. Lower housing; 24. Cover plate; 25. Connecting piece; 26. Handle. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0039] See Figure 1 and Figure 2 This application provides a battery module 10, including a battery box 100, a battery cell assembly 200, and a conductive component 300.

[0040] See Figure 1 and Figure 2 The battery box 100 has a hollow cubic structure, forming a sealed receiving space inside. The battery cell assembly 200 is installed inside the battery box 100. The battery cell assembly 200 includes a busbar 210 and multiple battery cells 220 arranged sequentially along a first direction. The first direction can be the length direction of the battery box 100. The positive terminals at the top of the multiple battery cells 220 are connected through a positive busbar, and the negative terminals at the top of the multiple battery cells 220 are connected through a negative busbar. End plates 410 are provided at both ends of the battery cell assembly 200, and the end plates 410 are fixedly connected to the bottom of the battery box 100, fixing the multiple battery cells 220 in place.

[0041] See Figure 1 , Figure 2 , Figure 3 and Figure 4The conductive component 300 includes a connector 310 and a mating connector 320. The connector 310 is mounted on the battery box 100 and has a first connecting portion 311 and a second connecting portion 312. The first connecting portion 311 is located inside the battery box 100, and the second connecting portion 312 extends outside the battery box 100. The mating connector 320 is mounted on the cell assembly 200 and is electrically connected to the busbar 210 of the cell assembly 200. The connector 310 and the mating connector 320 are aligned, with the first connecting portion 311 inserting into the mating connector 320, and the second connecting portion 312 being used for electrical connection to an output terminal. The second connecting portion 312 is bent, and a through hole is provided on its horizontal portion, allowing the output terminal to be connected via a connecting piece. The connecting piece and the second connecting portion 312 are detachably and fixedly connected by a pin.

[0042] For example, see Figure 2 , Figure 3 and Figure 4 The connectors 310 are respectively a positive connector 310a and a negative connector 310b. Correspondingly, the mating connectors 320 are divided into a positive mating connector 320a and a negative mating connector 320b. The mating connectors 320 are disposed at the ends of the busbar 210. Among them, the positive mating connector 320a is connected to the positive busbar, and the positive connector 310a is plugged into the positive mating connector 320a. The negative mating connector 320b is connected to the negative busbar, and the negative connector 310b is plugged into the negative mating connector 320b.

[0043] In this embodiment, the battery module 10 includes a battery box 100, a cell assembly 200, and a conductive component 300. The conductive component 300 includes a connector 310 and a mating connector 320. The first connecting portion 311 of the connector 310 is inserted into the mating connector 320, and the second connecting portion 312 of the connector 310 extends outside the battery box 100 and is electrically connected to the output terminal. The insertion and assembly of the connector 310 and the mating connector 320 is completed during the assembly of the battery box 100 and the cell assembly 200, resulting in a stable and reliable connection that is convenient for installation and operation. Furthermore, the connector 310 is not located outside the battery box 100, facilitating connection to the output terminal.

[0044] In some embodiments, see Figure 6 and Figure 7 The connector 310 also includes a stop 313, which is located between the first connecting portion 311 and the second connecting portion 312, and connects the first connecting portion 311 and the second connecting portion 312. The stop 313 is located outside the battery box 100, and one end of the stop 313 near the first connecting portion 311 abuts against the battery box 100. The stop 313 restricts the movement of the connector 310.

[0045] In some embodiments, see Figure 6 , Figure 7 and Figure 9 The connector 310 also includes a protective cover 315, which covers the second connecting portion 312. The stop portion 313 has a snap-fit ​​protrusion 314, and the protective cover 315 has a snap-fit ​​groove, allowing the protective cover 315 to snap into the stop portion 313. Connecting pieces 25 extend from both ends of the protective cover 315. The protective cover 315 protects the second connecting portion 312.

[0046] In some embodiments, see Figure 4 The mating component 320 includes a first elastic portion 321 and a second elastic portion 322. A mating gap 323 is formed between the first elastic portion 321 and the second elastic portion 322. The first elastic portion 321 and the second elastic portion 322 can be elastic sheets made of elastic material. The two elastic sheets are spaced apart and opposite to each other to form the mating gap 323. A first connecting portion 311 is located within the mating gap 323 and is connected to the first elastic portion 321 and the second elastic portion 322. The first connecting portion 311 can be a connecting piece, located within the mating gap 323. The thickness of the connecting piece is slightly larger than the size of the mating gap 323, so that the connecting piece can fit snugly against the first elastic portion 321 and the second elastic portion 322 on both sides.

[0047] In this embodiment, the insertion gap 323 formed by the first elastic part 321 and the second elastic part 322 enables the insertion mating part 320 to have a certain elastic deformation capability. The elastic restoring force of the insertion mating part 320 clamps and fixes the first connecting part 311, making the insertion operation simple and the connection stable.

[0048] In some embodiments, see Figure 4 , Figure 5 , Figure 6 and Figure 7 Both the first elastic portion 321 and the second elastic portion 322 include a vertical segment 324 and a horizontal segment 325 connected together, and the first elastic portion 321 and the second elastic portion 322 are bent. The horizontal segments 325 of the first elastic portion 321 and the second elastic portion 322 are fitted together and connected to the busbar 210. The vertical segment 324 extends along the height direction of the battery box 100. The vertical segments 324 of the first elastic portion 321 and the second elastic portion 322 are spaced apart to form an insertion gap 323.

[0049] In this embodiment, the first elastic part 321 and the second elastic part 322 are provided with a vertical section 324 and a horizontal section 325, which facilitates the connection of the horizontal section 325 of the plug-in mating part 320 to the busbar 210 and facilitates the insertion of the vertical section 324 to the plug-in part 310.

[0050] In some embodiments, seeFigure 7 The vertical segment 324 is bent 180° at one end away from the horizontal segment 325 to form a bent portion 326, which is spaced a certain distance from the vertical segment 324. A connection gap 323 is formed between the bent portion 326 of the first elastic portion 321 and the bent portion 326 of the second elastic portion 322. The connector 310 is inserted into the connection gap 323, and the bent portions 326 of the first elastic portion 321 and the second elastic portion 322 are fitted and connected to the connector 310. The elastic restoring force of the bent portion 326 clamps and fixes the connector 310.

[0051] In this embodiment, a bent portion 326 is formed at the end of the vertical segment 324. The bent portion 326 is spaced a certain distance from the vertical segment 324, providing sufficient space for the deformation of the bent portion 326 and increasing the overall structural strength of the plug-in mating connector 320.

[0052] In some embodiments, the gap distance at one end of the plug gap 323 away from the busbar 210 is greater than the gap distance at the other end. The insertion end of the plug gap 323 is configured as a flared opening to facilitate the insertion of the connector 310 into the plug gap 323.

[0053] In some embodiments, see Figure 4 and Figure 7 The first elastic part 321 and the second elastic part 322 are integrally formed by bending the elastic sheet, which simplifies the processing technology.

[0054] In some embodiments, see Figure 4 and Figure 7 A through hole 327 is provided on the horizontal section 325. The through hole 327 of the first elastic part 321 is aligned and communicates with the through hole 327 of the second elastic part 322, and the pin passes through the through hole 327 and is detachably and fixedly connected to the busbar 210.

[0055] In some embodiments, the mating member 320 is magnetic.

[0056] Understandably, the plug-in mating part 320 is magnetic. When the battery is turned on, the plug-in mating part 320 generates magnetism through the current and connects with the plug-in part 310 to form a current convergence. The plug-in mating part 320 and the plug-in part 310 are tightly attached. When the battery is turned off, the magnetism generated by the current is small, the magnetic force between the plug-in mating part 320 and the plug-in part 310 disappears, and the plug-in mating part 320 and the plug-in part 310 are disconnected to avoid overcharging or over-discharging caused by BMS failure.

[0057] In some embodiments, see Figure 2The battery box 100 includes a base plate 110 and an upper box portion 120, with the base plate 110 and the upper box portion 120 being sealed together. A connector 310 is mounted on the side plate of the upper box portion 120 opposite to the base plate 110, and a connector 320 is disposed on the side of the cell assembly 200 facing away from the base plate 110. The cell assembly 200 is fixed to the base plate 110. This improves the sealing performance of the battery box 100, reduces air inside the battery module 10, and lowers the risk of thermal runaway due to less oxygen inside the battery module 10.

[0058] In some embodiments, see Figure 2 and Figure 3 The battery cell assembly 200 is mounted on the base plate 110 via a fixing assembly 400. The fixing assembly 400 includes an end plate 410, a first fixing block 420, a second fixing block 430, and a pin 440. The end plate 410 is located at both ends of the battery cell assembly 200, restricting the movement of the battery cell assembly 200 along a first direction. The first fixing block 420 is fixed to the base plate 110 and located on the side of the end plate 410 opposite to the battery cell assembly 200. The second fixing block 430 is fixed to the side of the end plate 410 opposite to the battery cell assembly 200. The first fixing block 420 and the second fixing block 430 are aligned along the width direction of the battery box 100. The pin 440 passes through the second fixing block 430 and is fixedly connected to the first fixing block 420, thereby fixing the end plate 410 to the base plate 110 and securing the battery module 10.

[0059] In some embodiments, see Figure 2 and Figure 3 The base plate 110 and the upper housing 120 are sealed together by a sealing element 130. For example, the sealing element 130 is a sealing strip, which is arranged circumferentially along the base plate 110, and the lower end of the upper housing 120 is sealed to the base plate 110 by the sealing strip. The sealing structure is simple and facilitates the assembly of the base plate 110 and the upper housing 120.

[0060] In some embodiments, see Figure 2 The bottom plate 110 has heat dissipation fins 111 on one side away from the upper box 120. The heat dissipation fins 111 conduct heat generated by the cell pack 200 to the outside of the battery module 10, thereby improving the heat dissipation effect of the battery module 10.

[0061] In some embodiments, see Figure 3 A heat-conducting component 140 is provided between the base plate 110 and the cell assembly 200. The heat-conducting component 140 is a heat-conducting sheet, with one side of the heat-conducting sheet attached to the bottom of the cell assembly 200 and the other side attached to the base plate 110. The heat-conducting sheet is laid flat on the bottom of the cell assembly 200. By setting up the heat-conducting component 140, excessive heat concentration is avoided, and the internal temperature of the battery module 10 is evenly distributed, thereby improving the temperature uniformity of the battery module 10 and extending the product's service life.

[0062] See Figure 8 andFigure 9 This application also provides an energy storage system, including a battery module 10 and a housing 20 as described above. The battery module 10 is installed inside the housing 20, and the housing 20 is provided with an output terminal 21, which is connected to a second connection portion 312. The energy storage system of this application has the same technical effects as the battery module 10 described above, and will not be described again in this application.

[0063] In some embodiments, see Figure 8 The bottom of the housing 20 has an opening 22, and the bottom of the battery box 100 is sealed to the housing 20 around the opening 22. For example, the bottom of the battery box 100 is fixedly connected to the housing 20 around the opening 22 by friction welding. Heat dissipation fins 111 extend beyond the housing 20 to improve heat dissipation. The battery module 10 achieves double sealing through the sealing structure of the housing 20, improving the sealing performance and reliability of the battery module 10.

[0064] In some embodiments, see Figure 9 The housing 20 includes a lower casing 23 and a cover plate 24, which are sealed together by a sealing strip. An opening 22 is provided at the bottom of the lower casing 23 opposite to the cover plate 24. The battery module 10 is welded and fixed inside the lower casing 23. The second connecting part 312 is connected to the output terminal 21 via a connecting piece 25. Then, the cover plate 24 is closed to facilitate the assembly of the housing 20 and the battery module 10.

[0065] In some embodiments, see Figure 8 and Figure 9 The housing 20 is also equipped with a handle 26 to facilitate users in moving the energy storage system.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0068] The battery module and energy storage system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery module (10), characterized in that, include: Battery box (100); The battery cell assembly (200) is installed inside the battery box (100); A conductive component (300) includes a connector (310) and a mating connector (320). The connector (310) is mounted on the battery box (100). The connector (310) has a first connecting portion (311) and a second connecting portion (312). The first connecting portion (311) is located inside the battery box (100), and the second connecting portion (312) extends outside the battery box (100). The mating connector (320) is mounted on the battery cell assembly (200) and is electrically connected to the busbar (210) of the battery cell assembly (200). The connector (310) and the mating connector (320) are aligned. The first connecting portion (311) is inserted into the mating connector (320), and the second connecting portion (312) is used for electrical connection with the output terminal.

2. The battery module (10) according to claim 1, characterized in that, The plug-in mating part (320) includes a first elastic part (321) and a second elastic part (322). The first elastic part (321) is connected to the second elastic part (322). A plug-in gap (323) is formed between the first elastic part (321) and the second elastic part (322). The first connecting part (311) is located in the plug-in gap (323) and is connected to the first elastic part (321) and the second elastic part (322).

3. The battery module (10) according to claim 2, characterized in that, Both the first elastic part (321) and the second elastic part (322) include a vertical segment (324) and a horizontal segment (325) connected together. The horizontal segments (325) of the first elastic part (321) and the second elastic part (322) are fitted together and connected to the busbar (210). The vertical segments (324) of the first elastic part (321) and the vertical segments (324) of the second elastic part (322) are arranged at a relative interval to form the insertion gap (323).

4. The battery module (10) according to claim 3, characterized in that, The horizontal section (325) is provided with a through hole (327).

5. The battery module (10) according to any one of claims 1 to 4, characterized in that, The plug-in mating part (320) is magnetic.

6. The battery module (10) according to claim 1, characterized in that, The battery box (100) includes a bottom plate (110) and an upper box (120). The bottom plate (110) and the upper box (120) are sealed together. The plug-in member (310) is installed on the side plate of the upper box (120) opposite to the bottom plate (110). The plug-in mating member (320) is disposed on the side of the battery cell assembly (200) away from the bottom plate (110).

7. The battery module (10) according to claim 6, characterized in that, The bottom plate (110) and the upper box (120) are sealed together by a sealing element (130).

8. The battery module (10) according to claim 6, characterized in that, The bottom plate (110) has heat dissipation fins (111) on one side away from the upper box (120); And / or, a heat-conducting element (140) is provided between the base plate (110) and the battery cell assembly (200).

9. An energy storage system, characterized in that, include: The battery module (10) as described in any one of claims 1 to 8; The housing (20) contains the battery module (10) installed inside it. The housing (20) has an output terminal (21) connected to the second connection part (312).

10. The energy storage system according to claim 9, characterized in that, The bottom of the housing (20) is provided with an opening (22), and the bottom of the battery box (100) is sealed to the housing (20) around the opening (22).

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