Safety device for battery pack, battery pack and vehicle

Abstract

The utility model discloses a safety device for a battery pack, the battery pack and a vehicle. The safety device for the battery pack comprises a confluence module and a safety module, the collecting module is communicated with the confluence module, and the collecting module is suitable for collecting the electrolyte sprayed by the battery cell; and the absorption module is arranged in the confluence module, and the absorption module is suitable for absorbing the electrolyte collected by the collection module. By arranging the confluence module, the collection module and the absorption module, dredging and absorption of the electrolyte released by the battery cell can be realized, and thermoelectric separation in the battery pack is realized, so that the safety performance of the battery pack is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a safety device for a battery pack, a battery pack and a vehicle. Background Art

[0002] In the related art, a battery pack includes a battery box and battery modules arranged in the battery box. A pressure relief hole is provided on the battery box. The battery box includes a bottom plate and two first side plates opposite to each other in a first direction. The first side plates are provided with a first pressure relief channel communicated with the pressure relief hole. The inner surface of the bottom plate is recessed with a plurality of flow guide grooves, and the flow guide grooves are communicated with the first pressure relief channel. The battery modules include a plurality of battery cells arranged side by side, and the battery cells and the flow guide grooves correspond one by one. An explosion-proof valve is arranged on the battery cell and corresponds to the notch of the flow guide groove.

[0003] However, the existing battery pack also has significant defects: the dredging and absorption effects of the electrolyte released by the battery cells are poor, which affects the thermoelectric separation in the battery pack, and the safety performance of the battery pack is low. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a safety device for a battery pack, which can realize the dredging and absorption of the electrolyte released by the battery cells, realize the thermoelectric separation in the battery pack, and improve the safety performance of the battery pack.

[0005] The utility model further provides a battery pack.

[0006] The utility model further provides a vehicle.

[0007] The safety device for a battery pack according to the utility model includes: a current collecting module; a collecting module, which is communicated with the current collecting module and is adapted to collect the electrolyte after the battery cells are ejected; an absorption module, which is arranged in the current collecting module and is adapted to absorb the electrolyte collected by the collecting module.

[0008] The safety device for a battery pack according to the utility model, by providing a current collecting module, a collecting module and an absorption module, can realize the dredging and absorption of the electrolyte released by the battery cells, realize the thermoelectric separation in the battery pack, and thus greatly improve the safety performance of the battery pack.

[0009] In some examples of the utility model, the current collecting module includes: a current collecting body and a cover plate. The current collecting body and the cover plate define a cavity. The collecting module is communicated with the cavity, and the absorption module is arranged in the cavity.

[0010] In some examples of the present utility model, the busbar body includes: a first busbar portion, a second busbar portion, and a third busbar portion. The first busbar portion and the second busbar portion are disposed opposite to each other. The third busbar portion is connected between the first busbar portion and the second busbar portion. The collection module and the absorption module are disposed on the first busbar portion and the second busbar portion.

[0011] In some examples of the present utility model, the safety device for a battery pack further includes: a first explosion-proof valve. One end of the third busbar portion is provided with a discharge port, and the discharge port is connected to the first explosion-proof valve.

[0012] In some examples of the present utility model, the first busbar portion is provided with a first outlet, the second busbar portion is provided with a second outlet, the third busbar portion is provided with a first inlet and a second inlet. The first inlet is adhesively connected to the first outlet, and the second inlet is adhesively connected to the second outlet.

[0013] In some examples of the present utility model, the busbar body is provided with a first mounting portion, and the cover plate is provided with a second mounting portion. The first mounting portion and the second mounting portion are mounted and matched.

[0014] In some examples of the present utility model, the safety device for a battery pack further includes: a separator. The separator is disposed in the cavity. The collection module is provided with a plurality of collection ports, and the separator is disposed between two adjacent collection ports.

[0015] In some examples of the present utility model, the safety device for a battery pack further includes: a seal. The seal is disposed on a side of the collection port away from the cavity.

[0016] In some examples of the present utility model, the collection module is further provided with a clamping portion at the collection port, and the clamping portion is clamped and matched with the cover plate.

[0017] In some examples of the present utility model, an installation groove is provided on the busbar body, and the absorption module is disposed in the installation groove.

[0018] The battery pack according to the present utility model includes: a battery cell. The battery cell is provided with a second explosion-proof valve; the above-mentioned safety device for a battery pack, and the collection module is disposed opposite to the second explosion-proof valve.

[0019] For the battery pack according to the present utility model, in the first direction, the second explosion-proof valves are provided at both ends of the battery cell, and the collection modules are located on both sides of the battery cell in the first direction. The collection module located at one end of the battery cell in the first direction is communicated with the second explosion-proof valve provided at one end of the battery cell in the first direction, and the collection module located at the other end of the battery cell in the first direction is communicated with the second explosion-proof valve provided at the other end of the battery cell in the first direction.

[0020] The battery pack according to the present utility model further includes: a battery cell group and an explosion-proof beam. The battery cell group includes a plurality of the battery cells, and the explosion-proof beam is provided between two adjacent battery cell groups.

[0021] The vehicle according to the present utility model includes: the battery pack described above.

[0022] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic structural diagram of the safety device according to an embodiment of the present utility model;

[0025] Figure 2 is a partial enlarged view of the collection module;

[0026] Figure 3 is a schematic structural diagram of a battery pack according to another embodiment of the present utility model;

[0027] Figure 4 is a plan view of a battery pack according to another embodiment of the present utility model.

[0028] Reference Signs:

[0029] 1, safety device;

[0030] 10, busbar module; 101, busbar body; 102, cover plate; 103, cavity; 104, first busbar part; 105, second busbar part; 106, third busbar part; 107, first mounting part; 108, second mounting part; 109, mounting groove; 20, collection module; 201, collection port; 202, clamping part; 30, battery cell; 301, second explosion-proof valve; 40, absorption module; 50, first explosion-proof valve; 60, discharge port; 70, separator; 80, seal; 2, battery pack. Detailed Embodiments

[0031] Embodiments of the present utility model will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present utility model will be described in detail below.

[0032] Reference will be made below Figures 1-4 to describe a safety device 1 for a battery pack 2 according to an embodiment of the present utility model.

[0033] As Figure 1 shown, a safety device 1 for a battery pack 2 according to an embodiment of the present utility model includes: a busbar module 10, a collection module 20, and an absorption module 40. The busbar module 10 can play a role in busbar connection, mainly for releasing the high-temperature electrolyte released by the battery cells 30. The collection module 20 can collect the high-temperature electrolyte released by the battery cells 30, and the absorption module 40 is used for absorbing the liquid electrolyte.

[0034] As Figure 1 shown, the collection module 20 is connected to the busbar module 10, and the absorption module 40 is disposed within the busbar module 10. Specifically, first, the collection module 20 collects the electrolyte released by the battery cells 30. The collection module 20 is connected to the busbar module 10, so that the electrolyte collected by the collection module 20 will flow into the busbar device 10. It should be noted that the electrolyte released by the battery cells 30 is high-temperature gaseous electrolyte, but part of the high-temperature gaseous electrolyte will form liquid electrolyte after entering the busbar device 10. The absorption module 40 is disposed within the busbar module 10, so that the absorption module 40 can absorb part of the electrolyte. Finally, the remaining gaseous electrolyte and liquid electrolyte will be discharged through the busbar channel. It should be noted that the absorption module 40 can be various materials for absorbing electrolyte. For example, the absorption module 40 can be an absorption foam.

[0035] Thus, by providing the busbar module 10, the collection module 20, and the absorption module 40, the dredging and absorption of the electrolyte released by the battery cells can be realized, and the thermoelectric separation within the battery pack 2 can be achieved, thereby greatly improving the safety performance of the battery pack 2.

[0036] Specifically, as Figure 1As shown in the figure, the busbar module 10 includes: a busbar body 101 and a cover plate 102. The busbar body 101 and the cover plate 102 define a cavity 103. The collection module 20 is connected to the cavity 103, and the absorption module 40 is disposed in the cavity 103. It should be noted that the busbar body 101 is the main part of the busbar module 10, and the cover plate 102 can play a role of covering and sealing. In this way, the cavity 103 can be defined between the busbar body 101 and the cover plate 102. The collection module 20 is connected to the cavity 103, so that the collection module 20 can introduce the electrolyte released by the battery cell 30 into the cavity 103 and finally discharge it. The absorption module 40 is disposed in the cavity 103, which can make the setting of the absorption module 40 more stable and facilitate the absorption module 40 to absorb part of the liquid electrolyte.

[0037] Among them, as Figure 1 shown, the busbar body 101 includes: a first busbar portion 104, a second busbar portion 105, and a third busbar portion 106. The first busbar portion 104 and the second busbar portion 105 are disposed opposite to each other, and the third busbar portion 106 is connected between the first busbar portion 104 and the second busbar portion 105. The collection module 20 and the absorption module 40 are disposed on the first busbar portion 104 and the second busbar portion 105.

[0038] Specifically, the first busbar portion 104, the second busbar portion 105, and the third busbar portion 106 are connected to form the busbar body 101. The first busbar portion 104 and the second busbar portion 105 are disposed opposite to each other, and the third busbar portion 106 is connected between the first busbar portion 104 and the second busbar portion 105. In this way, the first busbar portion 104 and the second busbar portion 105 can be connected to form a whole, which is convenient for the installation and setting of the busbar body 101. Moreover, in this way, the busbar body 101 can form a U-shaped structure as a whole, and the battery cell 30 can be wrapped in the U-shaped structure, which is convenient for layout and can collect and absorb the electrolyte released by the battery cell 30 from multiple angles, thereby improving the safety performance of the battery pack 2.

[0039] In addition, the collection module 20 and the absorption module 40 are disposed on the second busbar portion 105. At the same time, the collection module 20 and the absorption module 40 are also disposed on the first busbar portion 104. In this way, the collection module 20 can collect the electrolyte ejected by the battery cell 30 at the second busbar portion 105 and the first busbar portion 104. Similarly, the absorption module 40 can absorb part of the liquid electrolyte at the second busbar portion 105 and the first busbar portion 104. In this way, the electrolyte released by the battery cell 30 can be collected and absorbed from multiple angles, thereby improving the safety performance of the battery pack 2.

[0040] In addition, as Figure 1 and Figure 4As shown in the figure, it further includes: a first explosion-proof valve 50. One end of the third confluence part 106 is provided with a discharge port 60, and the discharge port 60 is connected to the first explosion-proof valve 50. The first explosion-proof valve 50 is a pressure relief valve. The first explosion-proof valve 50 can be the total explosion-proof valve of the battery pack 2. First, the electrolytes at the second confluence part 105 and the first confluence part 104 first flow into the third confluence part 106, and then lead to the first explosion-proof valve 50 through the discharge port 60 of the third confluence part 106, and finally are discharged from the first explosion-proof valve 50. The first explosion-proof valve 50 can be used to ensure the safety of the battery pack 2. And a discharge port 60 is provided at one end of the third confluence part 106, which can avoid setting the discharge port 60 at the second confluence part 105 and the first confluence part 104, affecting the collection and absorption of the electrolytes released by the battery cells 30 at the second confluence part 105 and the first confluence part 104. It should be noted that there can be various directions for the discharge port 60, so multiple discharge ports 60 can be provided at the third confluence part 106.

[0041] Of course, as Figure 1 shown in the figure, the first confluence part 104 is provided with a first outlet, the second confluence part 105 is provided with a second outlet, the third confluence part 106 is provided with a first inlet and a second inlet. The first inlet is adhesively connected to the first outlet, and the second inlet is adhesively connected to the second outlet. Specifically, for the convenience of processing and manufacturing, the entire channel is composed of multiple parts spliced and combined. The confluence body 101 is spliced by the first confluence part 104, the second confluence part 105 and the third confluence part 106, which can avoid the leakage of electrolytes while facilitating the installation of the confluence body 101. In order to make the connection between the third confluence part 106 and the first confluence part 104, and the connection between the third confluence part 106 and the second confluence part 105 more firm and reliable, the first confluence part 104 can be provided with a first outlet, the second confluence part 105 can be provided with a second outlet, the third confluence part 106 can be provided with a first inlet and a second inlet. The first inlet is adhesively connected to the first outlet, and the second inlet is adhesively connected to the second outlet, so that the structure of the confluence body 101 is more stable.

[0042] Furthermore, as Figure 1 shown in the figure, the confluence body 101 is provided with a first installation part 107, and the cover plate 102 is provided with a second installation part 108. The first installation part 107 and the second installation part 108 are installed and matched. It should be noted that the first installation part 107 can be a small cylindrical structure with threaded holes, and the second installation part 108 can be a hollow small cylindrical structure. In this way, when the confluence body 101 and the cover plate 102 are installed, the screw can pass through the second installation part 108 and then be fixed on the first installation part 107. This installation is convenient, easy to disassemble, highly practical, and the connection is firm and reliable. Among them, the confluence body 101 and the cover plate 102 can be connected by three screws.

[0043] In addition, asFigure 1 As shown, it further includes: a separator 70 disposed in the cavity 103. The collection module 20 is provided with a plurality of collection ports 201, and the separator 70 is disposed between two adjacent collection ports 201. The separator 70 mainly functions to isolate. By disposing the separator 70 in the cavity 103, the setting of the separator 70 can be made more stable and reliable. The collection module 20 is provided with a plurality of collection ports 201, so that the plurality of collection ports 201 can respectively correspond to a plurality of battery cells 30, thereby better collecting the electrolyte released by each battery cell 30. In addition, a separator 70 is disposed between two adjacent collection ports 201. It should be noted that each battery cell 30 is provided with a second explosion-proof valve 301, and the electrolyte of each battery cell 30 is released through the corresponding second explosion-proof valve 301, while the separator 70 can reduce or even eliminate the influence on the adjacent second explosion-proof valve 301 when a single second explosion-proof valve 301 is opened.

[0044] It should be noted that as Figure 1 and Figure 2 shown, the safety device 1 for the battery pack 2 further includes: a seal 80 disposed on the side of the collection port 201 away from the cavity 103. The seal 80 can function to seal. By disposing the seal 80 on the side of the collection port 201 away from the cavity 103, the seal 80 can be a high-temperature resistant rubber pad, so that the seal 80 can be in close contact with the second explosion-proof valve 301, thereby sealing between the collection port 201 and the second explosion-proof valve 301, and thus avoiding the leakage of the electrolyte of the battery pack 2.

[0045] In this way, it can be avoided that when the second explosion-proof valve 301 releases the electrolyte, it will damage other devices in the battery pack 2. For example, the electrolyte corrodes the sampling NTC point and the circuit board in the battery pack 2, and causes a short circuit. At the same time, it will corrode various cables. Once the electrolyte corrodes the high-voltage and low-voltage cables, it is very likely to cause insulation failure and lead to an uncontrollable phenomenon.

[0046] In addition, as Figure 1 and Figure 2 shown, the collection module 20 is further provided with a clamping portion 202 at the collection port 201, and the clamping portion 202 is in clamping cooperation with the cover plate 102. The collection module 20 is provided with a clamping portion 202 at the collection port 201, which facilitates the splicing and limiting of the collection module 20 and the cover plate 102. The clamping portion 202 is in clamping cooperation with the cover plate 102, which is convenient for the connection of the collection module 20 and can also function to seal, thereby avoiding the leakage of the electrolyte of the battery pack 2, improving the protection effect of the safety device 1 on the battery pack 2, and further ensuring the safety, reliability and stability during the vehicle driving process.

[0047] In addition to this, as Figure 1As shown, an installation groove 109 is provided on the busbar body 101, and the absorption module 40 is disposed in the installation groove 109. An installation groove 109 is provided on the busbar body 101. The installation groove 109 can play a role in installation and fixation. By disposing the absorption module 40 in the installation groove 109, it is convenient to install and set the absorption module 40 on the busbar body 101, and the setting of the absorption module 40 can be made more firm and reliable, so that the absorption module 40 can better play the absorption effect.

[0048] It should be noted that, as Figure 3 shown, the battery pack 2 according to an embodiment of the present invention includes: a battery cell 30 and the safety device 1 for the battery pack 2 described in the above embodiment. The battery cell 30 is provided with a second explosion-proof valve 301, and the collection module 20 is disposed opposite to the second explosion-proof valve 301. The battery cell 30 is the core component inside the battery pack 2 and can play a role in storing electric energy. The battery cell 30 is provided with a second explosion-proof valve 301, which can be used to ensure the safety of the battery cell 30. Among them, the collection module 20 is disposed opposite to the second explosion-proof valve 301, that is to say, the collection module 20 is aligned with the second explosion-proof valve 301 of each battery cell 30 to collect and converge the electrolyte released from the second explosion-proof valve 301.

[0049] In addition, as Figure 3 shown, in the first direction, second explosion-proof valves 301 are provided at both ends of the battery cell 30, and the collection modules 20 are located on both sides of the battery cell 30 in the first direction. The collection module 20 located at one end of the battery cell 30 in the first direction is connected to the second explosion-proof valve 301 provided at one end of the battery cell 30 in the first direction, and the collection module 20 located at the other end of the battery cell 30 in the first direction is connected to the second explosion-proof valve 301 provided at the other end of the battery cell 30 in the first direction. That is to say, the collection module 20 is aligned with the second explosion-proof valve 301 of each battery cell 30 to collect and converge the electrolyte released from the second explosion-proof valve 301. It should be noted that second explosion-proof valves 301 are provided at both ends of the battery cell 30. The collection module 20 located at one end of the battery cell 30 in the first direction is connected to the second explosion-proof valve 301 provided at one end of the battery cell 30 in the first direction, and the collection module 20 located at the other end of the battery cell 30 in the first direction is connected to the second explosion-proof valve 301 provided at the other end of the battery cell 30 in the first direction, which can be applied to various battery packs 2 with explosion-proof valves.

[0050] Specifically, as Figure 3As shown, the battery pack 2 further includes: a battery cell group and an explosion-proof beam. The battery cell group includes a plurality of battery cells 30, and the explosion-proof beam is disposed between two adjacent battery cell groups. That is to say, a plurality of battery cells 30 can be combined to form a battery cell group. Generally, one battery cell group can be disposed in a U-shaped safety device 1, and a plurality of safety devices 1 can be formed in the battery pack 2. A plurality of battery cell groups can be respectively disposed in a plurality of safety devices 1, and an explosion-proof beam can be disposed between two adjacent battery cell groups, thereby ensuring the safety of the entire battery pack 2.

[0051] The vehicle according to an embodiment of the present invention includes: the battery pack 2 described in the above embodiment.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0053] In the description of the present invention, the "first feature" and "second feature" may include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more. In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. In the description of the present invention, the first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0055] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A safety device (1) for a battery pack (2), characterized in that: include: Convergence module (10); a collecting module (20), the collecting module (20) being connected to the confluence module (10), the collecting module (20) being suitable for collecting electrolyte sprayed from the battery cell (30); An absorption module (40), the absorption module (40) being arranged in the confluence module (10), and the absorption module (40) being suitable for absorbing the electrolyte collected by the collection module (20).

2. The safety device (1) for a battery pack (2) according to claim 1, characterized in that: The confluence module (10) comprises: a confluence body (101) and a cover plate (102); the confluence body (101) and the cover plate (102) define a cavity (103); the collection module (20) is connected to the cavity (103); and the absorption module (40) is arranged in the cavity (103).

3. The safety device (1) for a battery pack (2) according to claim 2, characterized in that: The confluence body (101) comprises: a first confluence portion (104), a second confluence portion (105) and a third confluence portion (106); the first confluence portion (104) and the second confluence portion (105) are arranged opposite to each other; the third confluence portion (106) is connected between the first confluence portion (104) and the second confluence portion (105); and the collection module (20) and the absorption module (40) are arranged at the first confluence portion (104) and the second confluence portion (105).

4. The safety device (1) for a battery pack (2) according to claim 3, characterized in that: Also includes: A first explosion-proof valve (50), wherein one end of the third confluence portion (106) is provided with a discharge port (60), and the discharge port (60) is connected to the first explosion-proof valve (50).

5. The safety device (1) for a battery pack (2) according to claim 3, characterized in that: The first confluence portion (104) is provided with a first outlet, the second confluence portion (105) is provided with a second outlet, the third confluence portion (106) is provided with a first inlet and a second inlet, the first inlet is adhesively connected to the first outlet, and the second inlet is adhesively connected to the second outlet.

6. The safety device (1) for a battery pack (2) according to claim 2, characterized in that: The confluence body (101) is provided with a first mounting portion (107), the cover plate (102) is provided with a second mounting portion (108), and the first mounting portion (107) and the second mounting portion (108) are mounted and matched.

7. The safety device (1) for a battery pack (2) according to claim 2, characterized in that: Also includes: An isolating member (70), the isolating member (70) being arranged in the cavity (103); the collecting module (20) being provided with a plurality of collecting ports (201); and the isolating member (70) being arranged between two adjacent collecting ports (201).

8. The safety device (1) for a battery pack (2) according to claim 7, characterized in that: Also includes: A sealing member (80), wherein the sealing member (80) is arranged on a side of the collecting port (201) away from the cavity (103).

9. The safety device (1) for a battery pack (2) according to claim 7, characterized in that: The collection module (20) is further provided with a clamping portion (202) at the collection port (201), and the clamping portion (202) is clamped and matched with the cover plate (102).

10. The safety device (1) for a battery pack (2) according to claim 2, characterized in that: The confluence body (101) is provided with a mounting groove (109), and the absorption module (40) is arranged in the mounting groove (109).

11. A battery pack (2), characterized in that: include: A battery cell (30), wherein the battery cell (30) is provided with a second explosion-proof valve (301); In the safety device (1) for a battery pack (2) according to any one of claims 1 to 10, the collection module (20) and the second explosion-proof valve (301) are arranged opposite to each other.

12. The battery pack (2) according to claim 11, characterized in that: In a first direction, both ends of the battery cell (30) are provided with the second explosion-proof valve (301), the collection module (20) is located on both sides of the battery cell (30) in the first direction, the collection module (20) located at one end of the battery cell (30) in the first direction is connected to the second explosion-proof valve (301) provided at one end of the battery cell (30) in the first direction, and the collection module (20) located at the other end of the battery cell (30) in the first direction is connected to the second explosion-proof valve (301) provided at the other end of the battery cell (30) in the first direction.

13. The battery pack (2) according to claim 11, characterized in that: Also includes: A battery cell group and an explosion-proof beam, the battery cell group comprising a plurality of the battery cells (30), and the explosion-proof beam being arranged between two adjacent battery cell groups.

14. A vehicle, characterized in that: include: The battery pack (2) according to any one of claims 11 to 13.

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