Battery pack and electric equipment

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body with an accommodating cavity, and a single battery, a liquid cooling piece and an electric connecting piece which are arranged in the accommodating cavity, wherein each single battery comprises a shell and a pole arranged on the shell; the liquid cooling piece is arranged on the outer side of the shell and located on the side, provided with the pole, of the shell, and the electric connecting piece is located on the side, away from the shell, of the liquid cooling piece; wherein a cooling hole is formed in the liquid cooling piece, and the pole penetrates through the cooling hole and then is electrically connected with the electric connecting piece. According to the scheme, the cooling holes penetrate through the pole columns, so that the heat dissipation area of the pole columns is increased, the heat dissipation efficiency of the pole columns is effectively improved, and the risk of thermal runaway of the single batteries is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and an electrical device. Background Technology

[0002] With the rapid development of new energy technologies, battery packs, as core components in the field of new energy technology, are also developing rapidly. An important indicator for measuring the performance of battery packs is their safety performance.

[0003] Inside the battery pack, when a single cell is working, the terminal posts constantly carry a large current, which makes it easy for a large amount of heat to be generated in the terminal posts of the single cell. The accumulation of this heat may lead to risks such as melting and fire, resulting in thermal runaway within the battery pack and affecting the safety performance of the battery pack. Utility Model Content

[0004] This application provides a battery pack and an electrical device to effectively dissipate heat from individual batteries during operation and improve the safety performance of the battery pack.

[0005] A battery pack includes: a housing having a receiving cavity; a plurality of individual batteries disposed within the receiving cavity, each individual battery including a casing and terminals disposed on the casing; and a liquid cooling component and an electrical connector, both disposed within the receiving cavity, the liquid cooling component being disposed on the outside of the casing, the liquid cooling component being located on the side of the casing where the terminals are disposed, and the electrical connector being located on the side of the liquid cooling component away from the casing; wherein the liquid cooling component has cooling holes, and the terminals pass through the cooling holes and are electrically connected to the electrical connector.

[0006] In this embodiment, the terminal post is provided with cooling holes. This design increases the heat dissipation area of ​​the terminal post, allowing heat to be quickly dissipated through the liquid cooling component, effectively improving the heat dissipation efficiency of the terminal post and reducing the risk of thermal runaway in a single battery cell. For example, when the energy density and overcurrent intensity of a single battery cell are high, the heat generated by the terminal post will be very high. The design of the liquid cooling plate and cooling holes can effectively improve the heat dissipation efficiency of the terminal post, thereby reducing the risk of thermal runaway and effectively improving the safety performance of the battery pack.

[0007] As one of the optional embodiments of this application, the electrical connector includes a mounting base and a plurality of conductive elements disposed on the mounting base. The mounting base is fixedly connected to the housing, and the conductive elements have mating holes, with the poles interference-fitted into the mating holes.

[0008] In this embodiment, the electrical connection between the terminal and the conductive component is achieved through an interference fit structure. This allows the electrical connector to be pre-processed when manufacturing individual cells. When assembling the battery pack, the electrical connector is placed inside the battery pack, and then the terminal of the individual cell is inserted into the mating hole. Compared with traditional technology, there is no need to weld the conductive component and the terminal during the installation of individual cells, which greatly reduces the cumbersome welding process and enables efficient and rapid assembly of individual cells. Furthermore, the interference fit ensures stable electrical conduction between the conductive component and the terminal.

[0009] As one of the optional embodiments of this application, the mounting base has a plurality of mounting grooves recessed on the side facing the single battery cell, and a plurality of conductive components are embedded in the mounting grooves one by one.

[0010] As one of the optional embodiments of this application, the conductive element includes a base portion and an elastic portion, the base portion and the elastic portion surrounding a mating hole; wherein, the outer wall of the base portion is fitted against the inner wall of the mounting groove, and the elastic portion protrudes in a direction away from the inner wall of the mounting groove.

[0011] In this embodiment of the application, a specific structure of a conductive component is proposed. The fit between the base part and the mounting groove can ensure the stability of the conductive component being embedded in the mounting groove as a whole. The elastic part is limited by the inner sidewall of the mounting groove to ensure the maximum amount of deformation of the elastic part, thereby ensuring stable contact between the pole post and the conductive component, and ensuring a stable electrical connection between the pole post and the conductive component.

[0012] As one optional embodiment of this application, multiple individual cells are stacked along a second direction, and the terminals include a first terminal and a second terminal with opposite polarities; wherein, in the second direction, the conductive element corresponding to the first terminal of the preceding individual cell and the conductive element corresponding to the second terminal of the adjacent following individual cell are electrically connected to each other to realize the series connection between multiple individual cells.

[0013] As one of the optional embodiments of this application, in the second direction, a connecting channel is provided between the mounting slot corresponding to the first terminal of the preceding single cell and the mounting slot corresponding to the second terminal of the adjacent subsequent single cell. A transition plate is provided in the connecting channel, and the conductive components in the two adjacent mounting slots are electrically connected through the transition plate.

[0014] In this embodiment, the conductive components are electrically connected by a transition plate. The transition plate is embedded in the connecting channel and is limited by the connecting channel, thereby limiting the conductive components in the direction perpendicular to the mounting base. In this way, the conductive components do not need to be fixed in the mounting groove by other means. The limiting of the transition plate alone can prevent the conductive components from falling out of the mounting groove, thus ensuring the stability of the conductive components in the mounting groove.

[0015] As one of the optional embodiments of this application, the liquid cooling component includes a liquid cooling plate, a water inlet connector, and a water outlet connector. A liquid cooling channel is formed in the liquid cooling plate, and the water inlet connector and the water outlet connector are respectively connected to the liquid cooling channel.

[0016] As one of the optional embodiments of this application, the liquid cooling component is bolted to the mounting base.

[0017] As one of the optional embodiments of this application, the first direction is provided, the housing includes a bottom box and a cover, the bottom box has an open receiving cavity, and the cover is placed on the bottom box along the first direction to close the receiving cavity; the single cell also includes an explosion-proof valve, which is disposed on the side of the housing near the cover in the first direction, and the explosion-proof valve is disposed opposite to the terminal post.

[0018] An electrical device, characterized in that it includes the aforementioned battery pack.

[0019] One of the above technical solutions has the following advantages or beneficial effects:

[0020] 1. The terminal post features cooling holes, which increase the heat dissipation area of ​​the terminal post. Heat on the terminal post can be quickly dissipated through the liquid cooling system, effectively improving heat dissipation efficiency and reducing the risk of thermal runaway in individual cells. For example, when the energy density and overcurrent intensity of a single cell are high, the terminal post generates a very high amount of heat. The liquid cooling plate and cooling holes effectively improve heat dissipation efficiency, thereby reducing the risk of thermal runaway and enhancing the safety performance of the battery pack.

[0021] 2. The electrical connection between the terminal and the conductive component is achieved through an interference fit structure. This allows the electrical connector to be pre-processed when manufacturing individual cells. When assembling the battery pack, the electrical connector is placed inside the battery pack, and then the terminal of the individual cell is inserted into the mating hole. Compared with traditional technology, there is no need to weld the conductive component and the terminal during the installation of individual cells, which greatly reduces the cumbersome welding process and enables efficient and fast assembly of individual cells. Furthermore, the interference fit ensures stable electrical conduction between the conductive component and the terminal. Attached Figure Description

[0022] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0023] Figure 1 This is an exploded structural diagram of the battery pack provided in the embodiments of this application;

[0024] Figure 2 This is an exploded view provided in the embodiments of this application to illustrate the structure of a single battery cell, liquid cooling component, and electrical connector;

[0025] Figure 3 This is a cross-sectional view provided in an embodiment of this application to illustrate the structure of the electrical connector;

[0026] Figure 4 This is provided by the embodiments of this application. Figure 3 A magnified view of part A in the middle;

[0027] Figure 5 This is a structural diagram of the conductive component provided in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram of the series electrical conduction of a single battery cell provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the series electrical conduction of a single battery cell in another embodiment provided in this application;

[0030] Figure 8 This is a schematic diagram of parallel electrical conduction of a single battery cell provided in an embodiment of this application.

[0031] Reference numerals: 1. Box body; 11. Bottom box; 12. Cover; 10. Receiving cavity;

[0032] 2. Single cell; 21. Casing; 22. Terminal; 221. First terminal; 222. Second terminal; 23. Explosion-proof valve;

[0033] 3. Liquid-cooled components; 31. Liquid-cooled plate; 32. Water inlet connector; 33. Water outlet connector; 30. Cooling hole; 300. Liquid-cooled channel;

[0034] 4. Electrical connector; 41. Mounting base; 410. Mounting groove; 41a. Threaded hole; 42. Conductive component; 421. Base part; 422. Elastic part; 420. Mating hole; 43. Transition plate;

[0035] 5. Connecting channels;

[0036] 61. Positive terminal connector; 62. Negative terminal connector;

[0037] Z, first direction; X, second direction. 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] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0040] The following is in conjunction with the appendix Figure 1-8 This application will be further described below.

[0041] Reference Figure 1 and Figure 2 The present application provides a battery pack including a housing 1 having a accommodating cavity 10 and a single cell 2, a liquid cooling component 3, and an electrical connector 4 disposed within the accommodating cavity 10.

[0042] Specifically, the battery pack has intersecting first direction Z and second direction X. The housing 1 includes a bottom box 11 and a cover 12. The bottom box 11 has an open receiving cavity 10, and the cover 12 covers the open cavity 10 along the first direction Z to close the receiving cavity 10. Multiple individual batteries 2 are provided, and the multiple individual batteries 2 are stacked along the second direction X. Each individual battery 2 includes a housing 21, an electrode post 22 disposed on the housing 21, and an explosion-proof valve 23 disposed on the housing 21.

[0043] In some examples, the first direction Z can be the height direction of the battery pack, and the second direction X can be the length direction of the battery pack. The terminal post 22 and the explosion-proof valve 23 of the individual battery cell 2 are respectively disposed at both ends of the outer casing 21 in the first direction Z. The terminal post 22 and the explosion-proof valve 23 are arranged opposite each other to facilitate thermoelectric separation. Specifically, in the first direction Z, the terminal post 22 is disposed at the end of the individual battery cell 2 away from the cover 12, and the explosion-proof valve 23 is disposed at the end of the outer casing 21 close to the cover 12. The liquid cooling component 3 is disposed on the side of the outer casing 21 away from the cover 12, that is, on the outside of the outer casing 21. The liquid cooling component 3 is located on the side of the outer casing where the terminal post 22 is disposed, and the electrical connector 4 is located on the side of the liquid cooling component 3 away from the outer casing 21. The liquid cooling component 3 has cooling holes 30, and the terminal post 22 passes through the cooling holes 30 and is electrically connected to the electrical connector 4.

[0044] It should be noted that the first direction Z and the second direction X can also have other variations. For example, in some examples, the first direction Z is the height direction of the battery pack, and the second direction X can be the width direction of the battery pack, or the second direction X can be the diagonal direction of the battery pack.

[0045] In this embodiment, the terminal post 22 is provided with cooling holes 30. This arrangement increases the heat dissipation area of ​​the terminal post 22, allowing heat on the terminal post 22 to be quickly dissipated through the liquid cooler 3, effectively improving the heat dissipation efficiency of the terminal post 22 and reducing the risk of thermal runaway in the individual battery cell 2. It is understood that in some individual battery cells 2 with high energy density and high overcurrent intensity, the terminal post 22 generates a high amount of heat. The design of the liquid cooler 3 and cooling holes 30 allows for direct cooling of the peripheral surface of the terminal post 22, effectively improving its heat dissipation efficiency, thereby reducing the risk of thermal runaway and ensuring the safety performance of the battery pack.

[0046] Reference Figure 1 and Figure 2 As one of the optional embodiments of this application, the liquid cooling component 3 includes a liquid cooling plate 31, a water inlet connector 32 and a water outlet connector 33. A liquid cooling channel 300 is provided in the liquid cooling plate 31, and the water inlet connector 32 and the water outlet connector 33 are respectively connected to the liquid cooling channel 300.

[0047] Specifically, the liquid cooling component 3 is a rectangular plate structure, and the liquid cooling channel 300 is S-shaped and opened inside the liquid cooling plate 31. The water inlet connector 32 and the water outlet connector 33 are respectively connected to the two ends of the liquid cooling channel 300. The cooling hole 30 is set as a rectangle to match the pole 22. When the pole 22 passes through the cooling hole 30, the outer peripheral side of the pole 22 contacts the inner peripheral side of the cooling hole 30, thereby quickly dissipating heat.

[0048] In other alternative embodiments, in order to improve the heat dissipation effect of the cooling fluid on the cooling holes 30, an annular micro-cooling channels are opened on the periphery of each cooling hole 30 in the liquid cooling plate 31. The micro-cooling channels are all connected to the liquid cooling channel 300, which will further improve the cooling efficiency of the pole 22.

[0049] It should be noted that in one example, the single cell 2 is configured as a square cell, but it is not excluded that in other alternative embodiments, the single cell 2 may be a cylindrical cell, etc. The only requirement is that the single cell 2 has terminals 22 that protrude outwards from the outer casing 21.

[0050] Reference Figures 2-4 As one of the optional embodiments of this application, the electrical connector 4 includes a mounting base 41 and a plurality of conductive elements 42 disposed on the mounting base 41. The mounting base 41 is fixedly connected to the housing 1. The conductive elements 42 have mating holes 420, and the pole post 22 is interference-fitted into the mating holes 420.

[0051] Specifically, the mounting base 41 is rectangular in shape. In the first direction Z, the mounting base 41 is located on the side of the liquid cooling plate 31 away from the single cell 2. The side of the mounting base 41 facing the single cell 2 is recessed with multiple mounting grooves 410. Multiple conductive elements 42 are embedded in the mounting grooves 410 one by one. The terminals 22 of the single cell 2 are inserted into the mating holes 420 of the conductive elements 42 one by one.

[0052] Mounting base 41 is fixedly connected to the base box 11. In one example, the four corners of mounting base 41 are provided with threaded holes 41a extending along the first direction Z. Mounting base 41 is bolted to base box 11 through threaded holes 41a. In other alternative embodiments, mounting base 41 can also be welded or glued to base box 11. In one example, liquid cooling component 3 is also bolted to mounting base 41, which makes the liquid cooling component 3, mounting base 41 and base box 11 detachable, facilitating maintenance.

[0053] After the individual battery 2 is assembled on the mounting base 41, the individual battery 2 can be fixed by filling the space between the inner wall of the base box 11 and the outer casing 21 of the individual battery 2 with expanding foam or potting compound for sealing. An adhesive layer can be provided between the side of the outer casing 21 of the individual battery 2 facing the mounting base 41 and the mounting base 41 to further fix the individual battery 2, so as to ensure the positional stability between the individual battery 2 and the mounting base 41 and the stability of the electrical connection between the terminal 22 and the conductive component 42.

[0054] In this embodiment, the electrical connection between the terminal 22 and the conductive element 42 is achieved through an interference fit structure. This allows the electrical connector 4 to be processed first when manufacturing the individual battery 2. When assembling the battery pack, the electrical connector 4 is placed into the battery pack, and then the terminal 22 of the individual battery 2 is inserted into the mating hole 420. Compared with traditional technology, there is no need to weld the conductive element 42 and the terminal 22 when installing the individual battery 2, which greatly reduces the cumbersome welding process and achieves efficient and fast assembly of the individual battery 2. Furthermore, the interference fit ensures stable electrical conduction between the conductive element 42 and the terminal 22.

[0055] The following section provides a more detailed explanation of the electrical conduction between the single cell 2 and the conductive component 42.

[0056] Reference Figure 4 and Figure 5 As one of the optional embodiments of this application, the conductive element 42 includes a base portion 421 and an elastic portion 422, the base portion 421 and the elastic portion 422 surrounding to form a mating hole 420; wherein, the outer wall of the base portion 421 is fitted to the inner side wall of the mounting groove 410, and the elastic portion 422 protrudes in a direction away from the inner wall of the mounting groove 410.

[0057] Specifically, the base part 421 is C-shaped, and the elastic part 422 is arc-shaped. The outer peripheral sidewall of the base part 421 fits against the inner sidewall of the mounting groove 410, and a gap is left between the side of the elastic part 422 away from the mating hole 420 and the inner sidewall of the mounting groove 410. This gap forms the deformation allowance of the elastic part 422. When the pole post 22 is inserted into the mating hole 420, the inner peripheral sidewall of the mating hole 420 is compressed, which forces the elastic part 422 to deform in the direction away from the mating hole 420, thereby forming an interference fit connection.

[0058] It should be noted that in some other alternative examples, the conductive element 42 can also be set to other shapes, as long as it matches the structure of the pole 22. The conductive element 42 can also be designed as a structure that can be deformed as a whole, such as a frame-shaped conductive element 42, in which multiple sides are bent and protruded towards the center of the mating hole 420.

[0059] In this embodiment of the application, a specific structure of the conductive element 42 is proposed. The fit between the base part 421 and the mounting groove 410 can ensure the stability of the conductive element 42 as a whole embedded in the mounting groove 410. The elastic part 422 is limited by the inner side wall of the mounting groove 410 to ensure the maximum amount of deformation of the elastic part 422, thereby ensuring the stable contact between the pole post 22 and the conductive element 42, and ensuring the stable electrical connection between the pole post 22 and the conductive element 42.

[0060] Reference Figure 2 and Figure 6 As one of the optional embodiments of this application, multiple individual battery cells 2 are stacked along the second direction X. Each individual battery cell 2 has a terminal post 22, which includes a first terminal post 221 and a second terminal post 222 with opposite polarities. In the second direction X, the conductive member 42 corresponding to the first terminal post 221 of the previous individual battery cell 2 and the conductive member 42 corresponding to the second terminal post 222 of the adjacent next individual battery cell 2 are electrically connected to each other to realize the series connection between multiple individual battery cells 2.

[0061] Specifically, in the second direction X, a connecting channel 5 is provided between the mounting slot 410 corresponding to the first terminal post 221 of the preceding single cell 2 and the mounting slot 410 corresponding to the second terminal post 222 of the adjacent subsequent single cell 2. A transition piece 43 is provided in the connecting channel 5, and the conductive components 42 in the two adjacent mounting slots 410 are electrically connected through the transition piece 43.

[0062] In this embodiment, the conductive elements 42 are electrically connected by a transition piece 43. The transition piece 43 is embedded in the connecting channel 5 and is limited by the connecting channel 5, thereby limiting the conductive elements 42 in a direction perpendicular to the mounting base 41. In this way, the conductive elements 42 do not need to be fixed in the mounting groove 410 by other means. The limiting of the transition piece 43 alone can prevent the conductive elements 42 from falling out of the mounting groove 410, thus ensuring the stability of the conductive elements 42 in the mounting groove 410.

[0063] Reference Figure 7 In some alternative embodiments, the individual cells 2 can also be arranged in the same arrangement order. Thus, the first terminals 221 of multiple individual cells 2 are arranged in an array along the second direction X, and the second terminals 222 of multiple individual cells 2 are arranged in an array along the second direction X. In this way, in order to electrically connect the first terminal 221 of one individual cell 2 with the second terminal 222 of the next individual cell 2, the transition plate 43 needs to be tilted relative to the second direction X. Figure 7 As shown in the figure, this method still involves connecting multiple individual cells 2 in series.

[0064] It should be noted that individual battery cells 2 can also be connected in parallel. In one example, for example... Figure 8 As shown, a positive terminal connection bar 61 and a negative terminal connection bar 62 are provided on the mounting base 41. The positive terminal connection bar 61 is electrically connected to the positive terminal post 22 of a plurality of individual battery cells 2, and the negative terminal connection bar 62 is electrically connected to the negative terminal post 22 of a plurality of individual battery cells 2. This ultimately forms a parallel connection. In one example, the positive terminal connection bar 61 and the negative terminal connection bar 62 are embedded within the mounting base 41.

[0065] An electrical device, characterized in that it includes the aforementioned battery pack.

[0066] The above description is only a partial implementation of the embodiments of this application and is not intended to limit the application in any way. The protection scope of the embodiments of this application is not limited thereto. Any simple modifications, equivalent changes and alterations that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a box body having a receiving cavity; a plurality of single batteries arranged in the receiving cavity, each single battery comprising a shell and a pole arranged on the shell; a liquid cooling member and an electrical connecting member arranged in the receiving cavity, the liquid cooling member being arranged outside the shell and on the side of the shell where the pole is arranged, and the electrical connecting member being arranged on the side of the liquid cooling member away from the shell; wherein the liquid cooling member is provided with a cooling hole, and the pole is electrically connected to the electrical connecting member after penetrating the cooling hole. The electrical connecting member comprises a mounting seat fixedly connected to the box body and a plurality of conductive members arranged on the mounting seat, and the pole is arranged in the counter-holes in an interference fit.

2. The battery pack of claim 1, wherein, The side of the mounting seat facing the single battery is recessed and provided with a plurality of mounting grooves, and the plurality of conductive members are embedded in the mounting grooves one by one.

3. The battery pack of claim 2, wherein, The conductive member comprises a base portion and an elastic portion, and the base portion and the elastic portion form the counter-holes; wherein the outer wall of the base portion is arranged in close contact with the inner wall of the mounting groove, and the elastic portion is arranged protruding away from the inner wall of the mounting groove.

4. The battery pack of claim 3, wherein, The plurality of single batteries are stacked along a second direction, and the pole comprises a first pole and a second pole with opposite polarities; 5. The battery pack of claim 2, wherein, wherein in the second direction, the conductive member corresponding to the first pole of the previous single battery and the conductive member corresponding to the second pole of the adjacent next single battery are electrically connected to each other to realize the series connection between the plurality of single batteries. In the second direction, the mounting groove corresponding to the first pole of the previous single battery and the mounting groove corresponding to the second pole of the adjacent next single battery are provided with a communication channel, and the communication channel is provided with a transition sheet, and the conductive members in the adjacent two mounting grooves are electrically connected through the transition sheet.

6. The battery pack of claim 5, wherein, The liquid cooling member comprises a liquid cooling plate, a water inlet connector and a water outlet connector, the liquid cooling plate is provided with a liquid cooling channel, and the water inlet connector and the water outlet connector are respectively connected to the liquid cooling channel.

7. The battery pack of claim 1, wherein, The liquid cooling member is bolted to the mounting seat.

8. The battery pack of claim 2, wherein, The box body has a first direction, and comprises a bottom box and a cover body, the bottom box has an open receiving cavity, and the cover body is arranged on the bottom box in the first direction to close the receiving cavity; the single battery further comprises an explosion-proof valve, and in the first direction, the explosion-proof valve is arranged on the side of the shell close to the cover body, and the explosion-proof valve is arranged opposite to the pole.

9. The battery pack of claim 1, wherein, The battery pack according to any one of claims 1-9.

10. An electric device, characterized by ​ ​

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