Battery pack and energy storage device

Abstract

This utility model discloses a battery pack and energy storage device. In the battery pack, the housing has a receiving cavity for containing immersion liquid; the battery module is immersed in the immersion liquid; the battery management system is disposed outside the housing; the connecting components include a first connector, a first connecting line, a second connector, and a second connecting line. One end of the first connecting line is electrically connected to the portion of the first connector located inside the housing, and the other end of the first connecting line is electrically connected to the battery module. The second connector is disposed outside the housing, and one end of the second connecting line is electrically connected to the second connector, and the other end of the second connecting line is electrically connected to the battery management system. The second connector is used to plug into the first connector. Through the above method, the plugging of the first connector and the second connector forms a blocking structure, preventing the immersion liquid from flowing to the battery management system due to siphoning and capillary permeation, reducing the probability of leakage, and improving the safety and reliability of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and energy storage device. Background Technology

[0002] An immersed battery pack refers to a battery structure in which battery modules are immersed in an immersion liquid. In an immersed battery pack, to ensure efficient heat dissipation and stable operation, the battery modules are immersed in an immersion liquid within the battery pack casing. Because the immersion liquid is corrosive, to prevent the Battery Management System (BMS) from being corroded, the BMS is typically externally mounted outside the battery pack casing. One end of the wiring harness connects to the BMS, and the other end extends through the battery pack casing into the immersion liquid to connect to the battery modules. However, due to siphoning and capillary action, the immersion liquid can easily seep into the wiring harness from the connection point between the wiring harness and the battery modules, and then permeate along the internal gaps of the wiring harness to the connection point between the wiring harness and the BMS. This causes the immersion liquid to leak from inside the battery pack casing to the outside, resulting in leakage, which corrodes the BMS and affects the safety and reliability of the battery pack. Utility Model Content

[0003] The present invention aims to provide a battery pack and energy storage device that can reduce the probability of leakage and improve the safety and reliability of the battery pack.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this utility model embodiment is as follows: a battery pack is provided, including a housing, a battery module, a battery management system, and a connection component; the housing is provided with a receiving cavity for containing an immersion liquid; the battery module is disposed in the receiving cavity and immersed in the immersion liquid; the battery management system is disposed outside the housing; the connection component includes a first connector, a first connecting line, a second connector, and a second connecting line, the first connector being disposed inside the housing and at least partially protruding outside the housing, one end of the first connecting line being electrically connected to the portion of the first connector disposed inside the housing, and the other end of the first connecting line extending into the immersion liquid and being electrically connected to the battery module, the second connector being disposed outside the housing, one end of the second connecting line being electrically connected to the second connector, and the other end of the second connecting line being electrically connected to the battery management system, the second connector being used to insert into the first connector to electrically connect the battery module to the battery management system.

[0005] Optionally, the first connector is positioned above the immersion liquid, and one end of the first connecting line extends out of the immersion liquid and is electrically connected to the first connector.

[0006] Optionally, the first connector is soldered to the first connecting line to make the first connector electrically connected to the first connecting line.

[0007] Optionally, the battery pack further includes a sealant that covers the weld between the first connector and the first connecting wire, the sealant being used to seal the weld between the first connector and the first connecting wire.

[0008] Optionally, the battery management system is provided with a connection part located at the bottom of the battery management system, and the other end of the second connection line is connected to the connection part so that the other end of the second connection line is electrically connected to the battery management system, and the second connection line is at least partially located below the connection part.

[0009] Optionally, the housing is provided with a first protrusion and a second protrusion disposed opposite to each other. One end of the battery management system is connected to the end of the first protrusion away from the housing, and the other end of the battery management system is connected to the end of the second protrusion away from the housing. The first protrusion, the second protrusion and the battery management system together form a gap, which is used to allow air to flow in order to dissipate heat from the battery management system.

[0010] Optionally, the second connecting line at least partially extends through the gap, the gap serving to limit the swaying of the second connecting line.

[0011] Optionally, the battery pack further includes a sealing ring and a first fastener, the first fastener passing through the first connector and connected to the housing, the first fastener pressing the first connector to the housing, the sealing ring being wound between the first connector and the housing, the sealing ring being used to seal the gap between the first connector and the housing.

[0012] Optionally, the battery pack further includes a second fastener, which passes through the battery management system and is connected to the housing, thereby securing the battery management system to the housing.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is to provide an energy storage device, including the above-mentioned battery pack.

[0014] The beneficial effects of this utility model embodiment are as follows: Unlike the prior art, this utility model embodiment provides a battery pack, including a housing, a battery module, a battery management system, and a connecting component; the housing is provided with a receiving cavity for containing immersion liquid; the battery module is disposed in the receiving cavity and immersed in the immersion liquid; the battery management system is disposed outside the housing; the connecting component includes a first connector, a first connecting line, a second connector, and a second connecting line; the first connector is disposed inside the housing, with at least a portion of the first connector protruding outside the housing; one end of the first connecting line is electrically connected to the portion of the first connector disposed inside the housing, and the other end of the first connecting line extends into the immersion liquid and is electrically connected to the battery module; the second connector is disposed outside the housing; one end of the second connecting line is electrically connected to the second connector, and the other end of the second connecting line is electrically connected to the battery management system; the second connector is used to insert into the first connector to electrically connect the battery module and the battery management system.

[0015] In the above-described manner, the battery module and the battery management system are electrically connected through the insertion of the first connector and the second connector. The insertion of the first connector and the second connector forms a blocking structure, which prevents the immersion liquid from flowing into the battery management system due to siphon and capillary permeation, thereby reducing the probability of leakage and improving the safety and reliability of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this utility model or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0017] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of the battery pack provided in this embodiment of the utility model;

[0019] Figure 3 This is a partial structural schematic diagram of the battery pack provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Housing, 11. Receiving cavity, 12. Immersion liquid, 13. First protrusion, 14. Second protrusion;

[0022] 2 battery modules;

[0023] 3 Battery management system, 31 Connecting parts;

[0024] 4 connecting components, 41 first connector, 42 first connecting line, 43 second connector, 44 second connecting line;

[0025] 5. Sealant;

[0026] 6 gaps;

[0027] 100 battery pack. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] An immersed battery pack refers to a battery structure in which battery modules are immersed in an immersion liquid. In an immersed battery pack, to ensure efficient heat dissipation and stable operation, the battery modules are immersed in an immersion liquid within the battery pack casing. Because the immersion liquid is corrosive, to prevent the Battery Management System (BMS) from being corroded, the BMS is typically externally mounted outside the battery pack casing. One end of the wiring harness connects to the BMS, and the other end extends through the battery pack casing into the immersion liquid to connect to the battery modules. However, due to siphoning and capillary action, the immersion liquid can easily seep into the wiring harness from the connection point between the wiring harness and the battery modules, and then permeate along the internal gaps of the wiring harness to the connection point between the wiring harness and the BMS. This causes the immersion liquid to leak from inside the battery pack casing to the outside, resulting in leakage, which corrodes the BMS and affects the safety and reliability of the battery pack.

[0031] Based on this, the present invention provides an embodiment of a battery pack 100, which can reduce the probability of leakage and improve the safety and reliability of the battery pack 100.

[0032] To facilitate the reader's understanding of the concept of this utility model embodiment, the specific structure of the battery pack 100 is described below:

[0033] Please see Figures 1 to 3 The battery pack 100 includes a housing 1, a battery module 2, a battery management system 3, and a connection assembly 4. The housing 1 has a receiving cavity 11 for receiving an immersion liquid 12. The battery module 2 is disposed in the receiving cavity 11 and is immersed in the immersion liquid 12. The battery management system 3 is disposed outside the housing 1. The connection assembly 4 includes a first connector 41, a first connecting line 42, a second connector 43, and a second connecting line 44. The first connector 41 is disposed inside the housing 1 and at least partially protrudes outside the housing 1. One end of the first connecting line 42 is electrically connected to the portion of the first connector 41 disposed inside the housing 1, and the other end of the first connecting line 42 extends into the immersion liquid 12 and is electrically connected to the battery module 2. The second connector 43 is disposed outside the housing 1. One end of the second connecting line 44 is electrically connected to the second connector 43, and the other end of the second connecting line 44 is electrically connected to the battery management system 3. The second connector 43 is used to plug into the first connector 41 to electrically connect the battery module 2 to the battery management system 3.

[0034] In the above manner, the battery module 2 and the battery management system 3 are electrically connected through the insertion of the first connector 41 and the second connector 43 in this embodiment of the present invention. The insertion method of the first connector 41 and the second connector 43 forms a blocking structure. That is, the insertion structure of the first connector 41 and the second connector 43 can prevent the connecting component 4 from directly penetrating the shell 1, thereby blocking the flow of the immersion liquid 12 to the battery management system 3 due to siphon and capillary permeation, reducing the probability of leakage, and improving the safety and reliability of the battery pack 100.

[0035] Regarding the connection component 4 described above, please refer to [link / reference] in some embodiments. Figures 1 to 3 The first connector 41 is positioned above the surface of the immersion liquid 12, and one end of the first connecting line 42 extends out of the immersion liquid 12 and is electrically connected to the first connector 41. In this manner, the formation of pathways for siphoning and capillary penetration can be suppressed by raising the physical height.

[0036] Regarding the connection component 4 described above, please refer to [link / reference] in some embodiments. Figures 1 to 3 The first connector 41 is soldered to the first connecting line 42 to make the first connector 41 and the first connecting line 42 electrically connected. By soldering the first connector 41 to the first connecting line 42 in the above manner, the connection between the first connector 41 and the first connecting line 42 can be improved, and poor contact or loosening caused by vibration or plugging / unplugging can be avoided.

[0037] Furthermore, in some embodiments, please refer to Figures 1 to 3 The first connector 41 and the first connecting line 42 are fully soldered together to ensure that the first connector 41 and the first connecting line 42 are welded. In this way, the sealing performance of the connection between the first connector 41 and the first connecting line 42 can be improved, preventing the immersion liquid 12 from seeping out from the connection between the first connector 41 and the first connecting line 42 to the surface of the first connector 41, thereby preventing the immersion liquid 12 from extending from the outer surface of the first connector 41 to the outside of the housing 1.

[0038] Furthermore, in some embodiments, please refer to Figures 1 to 3The battery pack 100 also includes a sealant 5, which covers the weld joint between the first connector 41 and the first connecting line 42. The sealant 5 is used to seal the weld joint between the first connector 41 and the first connecting line 42. In this way, the sealant 5 can fill the pores generated during the welding process between the first connector 41 and the first connecting line 42, further improving the sealing performance of the connection joint and further preventing the immersion liquid 12 from seeping from the connection joint to the surface of the first connector 41, thereby further preventing the immersion liquid 12 from extending from the outer surface of the first connector 41 to the outside of the housing 1. Furthermore, in this way, the sealant 5 can cover the solder joint generated during the welding process between the first connector 41 and the first connecting line 42, reducing the probability of solder joint failure due to oxidation or corrosion, and improving the electrical connection stability of the first connector 41 and the first connecting line 42 during long-term use.

[0039] For the battery management system 3 described above, please refer to some embodiments. Figures 1 to 3 The battery management system 3 is provided with a connecting part 31, which is located at the bottom of the battery management system 3. The other end of the second connecting line 44 is connected to the connecting part 31 so that the other end of the second connecting line 44 is electrically connected to the battery management system 3. The second connecting line 44 is at least partially located below the connecting part 31. In this way, the second connecting line 44 is connected to the bottom of the battery management system 3, realizing inverted installation. The principle of gravity is used to form a backflow blocking structure for the immersion liquid 12. That is, the second connecting line 44 is lower than the connecting part 31, so the immersion liquid 12 is not easy to climb uphill, preventing the immersion liquid 12 from seeping into the battery management system 3 along the second connecting line 44.

[0040] Furthermore, in one embodiment, please refer to Figures 1 to 3 The housing 1 has a first protrusion 13 and a second protrusion 14 arranged opposite to each other. One end of the battery management system 3 is connected to the end of the first protrusion 13 away from the housing 1, and the other end of the battery management system 3 is connected to the end of the second protrusion 14 away from the housing 1. The first protrusion 13, the second protrusion 14, and the battery management system 3 together form a gap 6, which is used to allow airflow for heat dissipation of the battery management system 3. In this way, not only can the airflow through the gap 6 quickly remove the heat of the battery management system 3, but the gap 6 can also increase the distance between the battery module 2 and the battery management system 3, reducing the risk of the battery management system 3 being heated by radiation from the battery module 2.

[0041] Furthermore, in one embodiment, please refer to Figures 1 to 3 The second connecting line 44 at least partially passes through the gap 6, and the gap 6 is used to limit the swaying of the second connecting line 44. In this way, the displacement of the second connecting line 44 can be limited by the gap 6, thereby reducing the swaying of the second connecting line 44.

[0042] Furthermore, in some embodiments, there are multiple second connectors 43 and second connecting lines 44, and multiple connecting portions 31. One second connector 43 is electrically connected to one second connecting line 44. Each of the multiple second connecting lines 44 at least partially penetrates the gap 6. Each second connecting line 44 is connected to a connecting portion 31, so that all the multiple second connecting lines 44 are electrically connected to the battery management system 3. In this way, the gap 6 can be used to shape the multiple second connecting lines 44, control the path of the multiple second connecting lines 44, prevent the multiple second connecting lines 44 from tangling, and maintain the neat appearance of the multiple second connecting lines 44.

[0043] Please see Figures 1 to 3 The battery pack 100 also includes a sealing ring (not shown) and a first fastener (not shown). The first fastener passes through the first connector 41 and is connected to the housing 1, pressing the first connector 41 to the housing 1. The sealing ring is wrapped around the first connector 41 and the housing 1 to seal the gap between the first connector 41 and the housing 1. This method improves the stability of the first connector 41.

[0044] Please see Figures 1 to 3 The battery pack 100 also includes a second fastener (not shown), which passes through the battery management system 3 and connects to the housing 1, thus securing the battery management system 3 to the housing 1. This method improves the stability of the battery management system 3.

[0045] It can be understood that the first and second fasteners include, but are not limited to, screw structures, rivet structures, bolt and nut structures, etc.

[0046] This utility model provides a battery pack 100, including a housing 1, a battery module 2, a battery management system 3, and a connecting component 4. The housing 1 is provided with a receiving cavity 11 for receiving an immersion liquid 12. The battery module 2 is disposed in the receiving cavity 11 and is immersed in the immersion liquid 12. The battery management system 3 is disposed outside the housing 1. The connecting component 4 includes a first connector 41, a first connecting line 42, a second connector 43, and a second connecting line 44. The first connector 41 is disposed inside the housing 1, with at least a portion of the first connector 41 protruding outside the housing 1. One end of the first connecting line 42 is electrically connected to the portion of the first connector 41 disposed inside the housing 1, and the other end of the first connecting line 42 extends into the immersion liquid 12 and is electrically connected to the battery module 2. The second connector 43 is disposed outside the housing 1. One end of the second connecting line 44 is electrically connected to the second connector 43, and the other end of the second connecting line 44 is electrically connected to the battery management system 3. The second connector 43 is used to insert into the first connector 41 to electrically connect the battery module 2 and the battery management system 3. In the above manner, the battery module 2 and the battery management system 3 are electrically connected through the insertion of the first connector 41 and the second connector 43 in this embodiment of the present invention. The insertion of the first connector 41 and the second connector 43 forms a blocking structure, which prevents the immersion liquid 12 from flowing to the battery management system 3 due to siphon and capillary permeation, thereby reducing the probability of leakage and improving the safety and reliability of the battery pack 100.

[0047] This utility model provides another embodiment of an energy storage device, which includes the battery pack 100 described above. For the specific structure and function of the battery pack 100, please refer to the above embodiment, which will not be repeated here.

[0048] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The housing is provided with a receiving cavity for containing an immersion liquid; A battery module is disposed in the receiving cavity, and the battery module is immersed in the immersion liquid; The battery management system is located outside the housing; The connection assembly includes a first connector, a first connecting wire, a second connector, and a second connecting wire. The first connector is disposed inside the housing, with at least a portion of the first connector protruding outside the housing. One end of the first connecting wire is electrically connected to the portion of the first connector disposed inside the housing, and the other end of the first connecting wire extends into the immersion liquid and is electrically connected to the battery module. The second connector is disposed outside the housing, with one end of the second connecting wire electrically connected to the second connector, and the other end of the second connecting wire electrically connected to the battery management system. The second connector is used to insert into the first connector to electrically connect the battery module to the battery management system.

2. The battery pack according to claim 1, characterized in that, The first connector is positioned above the immersion liquid, and one end of the first connecting line extends out of the immersion liquid and is electrically connected to the first connector.

3. The battery pack according to claim 2, characterized in that, The first connector is soldered to the first connecting line to make the first connector electrically connected to the first connecting line.

4. The battery pack according to claim 3, characterized in that, The battery pack also includes a sealant that covers the weld between the first connector and the first connecting wire, and the sealant is used to seal the weld between the first connector and the first connecting wire.

5. The battery pack according to claim 4, characterized in that, The battery management system is provided with a connection part located at the bottom of the battery management system. The other end of the second connection line is connected to the connection part so that the other end of the second connection line is electrically connected to the battery management system. The second connection line is at least partially located below the connection part.

6. The battery pack according to claim 5, characterized in that, The housing has a first protrusion and a second protrusion disposed opposite to each other. One end of the battery management system is connected to the end of the first protrusion away from the housing, and the other end of the battery management system is connected to the end of the second protrusion away from the housing. The first protrusion, the second protrusion and the battery management system together form a gap, which is used to allow air to flow and dissipate heat from the battery management system.

7. The battery pack according to claim 6, characterized in that, The second connecting line at least partially extends through the gap, which serves to limit the swaying of the second connecting line.

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a sealing ring and a first fastener. The first fastener passes through the first connector and is connected to the housing. The first fastener presses the first connector to the housing. The sealing ring is wrapped between the first connector and the housing and is used to seal the gap between the first connector and the housing.

9. An energy storage device, characterized in that, Includes the battery pack as described in any one of claims 1-8.

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