Pole structure, battery cell, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a pole structure, a battery cell, a battery pack and a vehicle, the pole structure comprises a pole body and a switching block, the switching block is arranged on the pole body, the top surface of the switching block is not lower than the top surface of the pole body, and the outer side, far away from the pole body, of the switching block is provided with a mounting part. According to the utility model, the heat dissipation efficiency of the pole structure can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a pole structure, electric core, battery pack and vehicle. BACKGROUND

[0002] With the development of new energy, power battery systems are increasingly used in production and life. In the power battery system, fast charging is a key performance indicator. However, a large amount of heat is generated during fast charging, and an efficient thermal management system is needed to ensure battery safety and performance stability. In the prior art, the pole of the electric core is provided with a baffle on the side facing the liquid cooling system, and the baffle exchanges heat with the liquid cooling system. Since the heat of the pole is transferred to the liquid cooling system through the baffle, the heat dissipation efficiency of the pole is low, and there is a risk of thermal runaway. SUMMARY

[0003] The utility model discloses a pole structure, electric core, battery pack and vehicle can improve the heat dissipation efficiency of pole structure.

[0004] To achieve this purpose, the utility model adopts the following technical scheme:

[0005] The pole structure comprises:

[0006] A pole body;

[0007] An adapter block is arranged on the pole body, and the top surface of the adapter block is not lower than the top surface of the pole body. An installation portion is formed on the outer side of the adapter block away from the pole body.

[0008] In some embodiments, the adapter block comprises a main body portion and a protruding portion connected to each other. The outer periphery of the protruding portion and the top surface of the main body portion form the installation portion.

[0009] In some embodiments, the adapter block is fixedly sleeved on the pole body, and the adapter block and the inner wall surface of the fitting hole of the pole body have an annular protrusion.

[0010] In some embodiments, the pole body is sequentially sleeved with a first plastic member, an aluminum sheet and a second plastic member, and the first plastic member is attached to the bottom surface of the adapter block.

[0011] In some embodiments, the second end surface of the adapter block is provided with a receiving groove, part of the structure of the first plastic part is located in the receiving groove, and a first receiving space is formed by recessing away from the end surface of the adapter block, part of the structure of the light aluminum sheet is located in the first receiving space, and a second receiving space is formed by recessing away from the end surface of the adapter block, part of the structure of the second plastic part is located in the second receiving space, and a third receiving space is formed by recessing away from the end surface of the adapter block, and the bottom plate of the pole column body is at least partially located in the third receiving space.

[0012] In some embodiments, the width of the protruding part of the adapter block / 2-(the width of the bottom plate of the pole column body / 2+ the horizontal thickness of the vertical part of the first plastic part+ the horizontal thickness of the vertical part of the second plastic part+ the horizontal thickness of the vertical part of the light aluminum sheet)≥1, and the height of the protruding part of the adapter block is not less than the thickness of the bottom plate of the pole column body, and the bottom plate of the pole column body is completely located in the third receiving space.

[0013] In some embodiments, the height of the protruding part of the adapter block is less than the thickness of the bottom plate of the pole column body, and the thickness of the part of the bottom plate located in the third receiving space is not greater than the height of the protruding part.

[0014] The electric core comprises a shell and a pole column structure as described above, and the pole column structure is arranged on the shell.

[0015] The battery pack comprises a tab, a cooling assembly and an electric core as described above, adjacent electric cores are electrically connected through the tab, the tab is arranged at the mounting part, and the top surface of the tab is not higher than the top surface of the adapter block, and the adapter block is attached to the cooling assembly.

[0016] In some embodiments, the top surface of the tab is flush with the top surface of the adapter block.

[0017] In some embodiments, the cooling assembly comprises a liquid cooling plate and a heat-conducting structural adhesive arranged between the liquid cooling plate and the pole column structure of the electric core.

[0018] The vehicle comprises a battery pack as described above.

[0019] The utility model discloses the beneficial effects of:

[0020] The utility model discloses a kind of pole column structures, adapter block is arranged on pole column body, and the top surface of adapter block is not lower than the top surface of pole column body, and mounting part is provided on the outer side of adapter block away from pole column body.In the installation tab, tab can be installed at mounting part, so that part of adapter block can be directly contacted with the cooling assembly of battery pack, so that the heat of at least part of pole column structure can be directly dissipated by heat exchange with cooling assembly, improve the heat dissipation efficiency of pole column structure.

[0021] The utility model provides a kind of electric core, including shell and the pole structure as described above, can improve the heat dissipation efficiency of pole structure, reduce the risk of thermal runaway.

[0022] The utility model provides a kind of battery pack, including bar sheet, cooling assembly and the electric core as described above, since the pole structure of electric core can be directly exchanged with cooling assembly, can improve the heat dissipation efficiency of pole structure.

[0023] The utility model provides a kind of vehicle, including the battery pack as described above, since the pole structure of electric core in battery pack can be directly exchanged with cooling assembly, improve the heat dissipation efficiency of pole structure. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the utility model embodiment, the drawings needed to be used in the utility model embodiment will be simply introduced as follows: obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the utility model embodiment and these drawings for the ordinary skilled in the art without creating labor.

[0025] Figure 1 It is the utility model a pole structure and the section view of cooling assembly;

[0026] Figure 2 It is the utility model a pole structure section view;

[0027] Figure 3 It is the schematic diagram of electric core in the utility model;

[0028] Figure 4 It is the length direction section view of electric core in the utility model;

[0029] Figure 5 It is the section view of electric core along width direction in the utility model;

[0030] Figure 6 It is the schematic diagram of bar sheet in the battery pack in the utility model;

[0031] Figure 7 It is the schematic diagram of bar sheet and electric core cooperation in the utility model.

[0032] In the drawing:

[0033] 100, cell; 110, shell; 1, cooling assembly; 11, liquid cooling plate; 12, heat-conducting structural adhesive; 2, baffle; 21, positioning hole; 3, pole post structure; 31, pole post body; 311, bottom plate; 32, adapter block; 321, protruding part; 322, main body part; 3221, annular protrusion; 33, first plastic part; 34, light aluminum sheet; 35, second plastic part; 36, sealing ring; 3611, first sealing ring part; 362, second sealing ring part. DETAILED DESCRIPTION

[0034] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0035] In the present application, the terms "comprise", "comprising", "include", "including", "have", "has", "contain", "containing", or any other any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] In the present application, the terms "connect", "combine", and "mount" can be direct connection, combination or mounting, or indirect connection, combination or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, while indirect connection refers to the connection of two parts or components with at least one intermediate part, and the two parts or components are connected through the intermediate part.

[0037] In the present application, it will be understood by those skilled in the art that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or multiple parts in combination.

[0038] In the present invention, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the directions and positional relationships shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side and lower side not only represent the positive direction, but can also be understood as the side direction. For example, lower side can include directly below, lower left, lower right, lower front and lower back, etc.

[0039] In the process of designing the battery cell, in order to improve the heat dissipation efficiency of the pole structure, such as Figures 1-3 As shown, the present invention provides a pole structure. The pole structure 3 includes a pole body 31 and an adapter block 32. The adapter block 32 is disposed on the pole body 31, and the top surface of the adapter block 32 is not lower than the top surface of the pole body 31. The adapter block 32 has a mounting portion on the outside away from the pole body 31.

[0040] When installing the tab 2, the tab 2 can be installed at the mounting portion so that part of the adapter block 32 can directly contact the cooling assembly 1 of the battery pack, so that at least part of the heat of the pole structure 3 can be directly dissipated through heat exchange with the cooling assembly 1, thereby improving the heat dissipation efficiency of the pole structure 3.

[0041] In some embodiments, the adapter block 32 includes a main body 322 and a raised portion 321 that are interconnected. The outer periphery of the raised portion 321 and the top surface of the main body 322 form a mounting portion. Specifically, the main body 322 and the raised portion 321 can be integrally formed or welded together. The top surface of the main body 322 and the outer periphery of the raised portion 321 form a mounting portion, facilitating subsequent installation of the tab 2 while also reducing the height of the pole structure 3.

[0042] In some embodiments, the adapter block 32 is fixedly mounted on the pole body 31, and the inner wall surface of the mating hole between the adapter block 32 and the pole body 31 has an annular protrusion 3221. In this embodiment, the adapter block 32 and the pole body 31 are riveted together. Due to the plastic deformation of the pole body 31 in the radial direction during the riveting process, the top surface of the pole body 31 is lower than the top surface of the adapter block 32. After the riveting is completed, the annular protrusion 3221 is embedded in the pole body 31, thereby ensuring a stable connection between the adapter block 32 and the pole body 31.

[0043] In some embodiments, the first plastic part 33, the light aluminum sheet 34 and the second plastic part 35 are sequentially sleeved on the pole body 31, and the first plastic part 33 is attached to the bottom surface of the adapter block 32. The first plastic part 33 and the second plastic part 35 are used to insulate the pole body 31 and the light aluminum sheet 34, and the pole body 31, the first plastic part 33 and the second plastic part 35 are fixed on the light aluminum sheet 34 by riveting and welding process. The pole body 31 is welded with the positive or negative tab of the battery cell 100 and then welded with the shell 110 of the battery cell 100.

[0044] In some embodiments, the sealing ring 36 is sleeved on the pole body 31 and located between the first plastic part 33, the light aluminum sheet 34 and the second plastic part 35. The sealing ring 36 includes a first sealing ring part 3611 and a second sealing ring part 362 connected with each other. The end surface of the first sealing ring part 3611 is attached to the first plastic part 33, the light aluminum sheet 34 is attached to the end surface of the second sealing ring part 362, and the second plastic part 35 is attached to the outer circumferential surface of the second sealing ring part 362. By setting the sealing ring 36, the sealing performance can be further improved to prevent the electrolyte from flowing out.

[0045] In some embodiments, the second end surface of the adapter block 32 is provided with a containing groove, part of the structure of the first plastic part 33 is located in the containing groove and recessed from the end surface of the adapter block 32 to form a first containing space, part of the structure of the light aluminum sheet 34 is located in the first containing space and recessed from the end surface of the adapter block 32 to form a second containing space, part of the structure of the second plastic part 35 is located in the second containing space and recessed from the end surface of the adapter block 32 to form a third containing space, and the bottom plate 311 of the pole body 31 is at least partially located in the third containing space. By the above arrangement, the bottom plate 311 of the pole body 31 located in the shell 110 of the battery cell 100 can be at least partially located in the third containing space, so as to reduce the occupation of the bottom plate 311 of the pole body 31 to the internal space of the battery cell 100 and improve the utilization rate of the internal space of the battery cell 100. The containing groove is provided on the adapter block 32, which can reduce the weight of the adapter block 32, thereby reducing the weight of the pole structure 3, reducing the cost and reducing the use of materials. At the same time, the convex part 321 of the adapter block 32 can be fully utilized, and after the containing groove is provided, the influence on the strength of the adapter block 32 is reduced.

[0046] In some embodiments, since the depth of the accommodating groove of the second end surface of the adapter block 32 determines the distance of the upward movement of the bottom plate 311 of the pole body 31, when the groove depth reaches the thickness of the bottom plate 311 of the pole body 31, the lower surface of the bottom plate 311 of the pole body 31 is flush with the lower surface of the second plastic part 35, and at this time, the bottom plate 311 of the pole body 31 is completely located in the third accommodating space. However, since the width of the protruding part 321 of the adapter block 32 is limited, when the groove depth of the accommodating groove is too deep, the adapter block 32 has a local weak point, which reduces the strength of the adapter block 32 and even causes the adapter block 32 to break. Moreover, the width of the protruding part 321 is limited by the welding of the tab 2, and the width of the bottom plate 311 of the pole body 31 is limited by the welding of the adapter tab of the bottom of the pole. When the bottom plate 311 of the pole body 31 is unchanged, the improvement of the space utilization of the battery cell 100 is not greater than the thickness of the bottom plate 311 of the pole body 31. In order to fully improve the space utilization of the battery cell 100, the width of the protruding part of the adapter block / 2-(the width of the bottom plate of the pole body / 2+the horizontal thickness of the vertical part of the first plastic part+the horizontal thickness of the vertical part of the second plastic part+the horizontal thickness of the vertical part of the aluminum tab)≥1, and the height of the protruding part 321 of the adapter block 32 is not less than the thickness of the bottom plate 311 of the pole body 31, and the bottom plate 311 of the pole body 31 is completely located in the third accommodating space. Through the above limitation, the strength of the adapter block 32 is considered while the space utilization of the battery cell 100 is improved.

[0047] In some embodiments, the height of the protruding part 321 of the adapter block 32 is less than the thickness of the bottom plate 311 of the pole body 31, and the thickness of the bottom plate 311 located in the third accommodating space is not greater than the height of the protruding part 321. Through the above limitation, when the accommodating groove of the adapter block 32 is opened, the strength of the adapter block 32 can be avoided to be weakened too much. Generally, the thickness of the bottom plate 311 of the pole body 31 is 1mm-2mm, the thickness of the welding tab 2 area of the adapter block 32 is generally 1mm-2mm, and the maximum groove depth of the accommodating groove of the adapter block 32 is 0.5mm-1.5mm.

[0048] As shown in Figures 3-5 The present embodiment also provides a battery cell, which comprises a shell 110 and the pole structure 3 as described above, and the pole structure 3 is arranged on the shell 110. Since the pole structure 3 can be directly contacted with the cooling assembly 1 of the battery pack, the heat dissipation efficiency of the pole structure 3 can be improved, and the risk of thermal runaway can be reduced.

[0049] In some embodiments, as shown in Figure 4As shown, the length L1 of the battery cell 100, the length L2 of the main body 322 of the adapter block 32, and the length L3 of the protruding part 321 of the adapter block 32 satisfy the following relationship: 0.1≤L2 / (L1 / 2)≤0.99, 0.1≤L3 / (L2 / 2)≤0.99. Through the above limitation, the design of the battery cell 100 and the adapter block 32 is facilitated.

[0050] In some embodiments, as shown, Figure 5 As shown, the width W1 of the battery cell 100, the width W2 of the main body 322 of the adapter block 32, and the width W3 of the protruding part 321 of the adapter block 32 satisfy the following relationship: 0.1≤W2 / W1≤0.99, 0.1≤W3 / W2≤0.99. Through the above limitation, the design of the battery cell 100 and the adapter block 32 is facilitated.

[0051] The present embodiment also provides a battery pack comprising the gasket 2, the cooling assembly 1, and the battery cell 100 as described above, as shown, Figure 1 and Figure 7 As shown, the adjacent battery cells 100 are electrically connected through the gasket 2, the gasket 2 is arranged at the mounting part of the pole structure 3 of the battery cell 100, and the top surface of the gasket 2 is not higher than the top surface of the adapter block 32 of the pole structure 3 of the battery cell 100, and the adapter block 32 is attached to the cooling assembly 1. Since the pole structure 3 of the battery cell 100 can directly exchange heat with the cooling assembly 1, the heat dissipation efficiency of the pole structure 3 can be improved. Moreover, the protruding part 321 of the adapter block 32 can be used to position the gasket 2, and the gasket 2 and the main body 322 of the adapter block 32 are welded to realize the stable connection of the adapter block 32 and the gasket 2, and ensure the stability of the electrical connection of the gasket 2 and the adapter block 32.

[0052] As shown, Figure 6 In some embodiments, the gasket 2 is provided with a positioning hole 21 matched with the protruding part 321 of the adapter block 32, and the gasket 2 is sleeved on the protruding part 321 through the positioning hole 21. The gasket 2 and the adapter block 32 are connected by laser welding. In order to meet the overcurrent capacity and welding process feasibility, the welding seam track is preferably a rounded rectangle.

[0053] In some embodiments, the top surface of the gasket 2 is flush with the top surface of the adapter block 32. Through the above arrangement, the gasket 2 and the cooling assembly 1 can be attached, and part of the heat of the pole body 31 can be exchanged with the cooling assembly 1 through the gasket 2 to be discharged, further improving the heat dissipation efficiency.

[0054] In some embodiments, the cooling assembly 1 comprises a liquid cooling plate 11 and a heat-conducting structural adhesive 12 arranged between the liquid cooling plate 11 and the pole structure 3. By arranging the liquid cooling plate 11, and circulating cooling liquid in the liquid cooling plate 11, the pole structure 3 can be effectively heat-exchanged, so as to quickly take away the heat of the pole structure 3 and improve the heat dissipation efficiency of the pole structure 3. In other embodiments, a fan can also be arranged at the liquid cooling plate 11, and the fan is used to drive the air near the liquid cooling plate 11 to flow, so as to accelerate the heat dissipation of the liquid cooling plate 11. The liquid cooling plate 11 is bonded to the pole structure 3 through the heat-conducting structural adhesive 12, so as to stably connect the pole structure 3 and the liquid cooling plate 11, and even if a certain vibration or external force impact is applied, the pole structure 3 and the liquid cooling plate 11 will not be separated. Moreover, the heat-conducting structural adhesive 12 has high heat-conducting performance, can realize the heat conduction of the pole structure 3 in real time, ensure the heat dissipation efficiency of the pole structure 3, and reduce the local hot spot phenomenon.

[0055] The embodiment also provides a vehicle comprising the battery pack as above, since the pole structure 3 of the battery cell 100 in the battery pack can be directly heat-exchanged with the cooling assembly 1, the heat dissipation efficiency of the pole structure 3 is improved, and the local hot spot phenomenon is reduced.

[0056] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, on the basis of the above description, other different forms of changes or variations can be made. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A pole structure, characterized by include: Pole (31); A transfer block (32) is provided on the pole body (31), and the top surface of the transfer block (32) is not lower than the top surface of the pole body (31); and a mounting portion is provided on the outside of the transfer block (32) away from the pole body (31).

2. The pole structure of claim 1, wherein The adapter block (32) comprises a main body (322) and a raised portion (321) connected to each other, and the outer periphery of the raised portion (321) and the top surface of the main body (322) are arranged to form the mounting portion.

3. The pole structure of claim 1, wherein, The adapter block (32) is fixedly sleeved on the pole body (31), and the inner wall surface of the matching hole between the adapter block (32) and the pole body (31) has an annular protrusion (3221).

4. The pole structure according to any one of claims 1 to 3, characterized in that The pole body (31) is sequentially sleeved with a first plastic part (33), a plain aluminum sheet (34) and a second plastic part (35), and the first plastic part (33) is in contact with the bottom surface of the adapter block (32).

5. The pole structure of claim 4, wherein, A receiving groove is provided on the second end face of the adapter block (32); a portion of the structure of the first plastic part (33) is located in the receiving groove and is recessed at the end face away from the adapter block (32) to form a first receiving space; a portion of the structure of the light aluminum sheet (34) is located in the first receiving space and is recessed at the end face away from the adapter block (32) to form a second receiving space; a portion of the structure of the second plastic part (35) is located in the second receiving space and is recessed at the end face away from the adapter block (32) to form a third receiving space; and the bottom plate (311) of the pole body (31) is at least partially located in the third receiving space.

6. The pole structure of claim 5, wherein, The width of the raised portion of the adapter block (32) / 2-(the width of the bottom plate of the pole body / 2+the horizontal thickness of the vertical portion of the first plastic part+the horizontal thickness of the vertical portion of the second plastic part+the horizontal thickness of the vertical portion of the bare aluminum sheet) is greater than or equal to 1, and the height of the raised portion (321) of the adapter block (32) is not less than the thickness of the bottom plate (311) of the pole body (31), and the bottom plate (311) of the pole body (31) is completely located in the third accommodating space.

7. The pole structure of claim 5, wherein, The height of the protrusion (321) of the adapter block (32) is less than the thickness of the bottom plate (311) of the pole body (31), and the thickness of the bottom plate (311) located in the third accommodating space is not greater than the height of the protrusion (321).

8. An electric cell, characterized by The invention comprises a housing (110) and a pole structure according to any one of claims 1 to 7, wherein the pole structure is arranged on the housing (110).

9. A battery pack, characterized by It comprises a tab (2), a cooling assembly (1) and a battery cell (100) as claimed in claim 8, wherein adjacent battery cells (100) are electrically connected via the tab (2), the tab (2) is arranged at the mounting portion, and the top surface of the tab (2) facing the cooling assembly (1) is not higher than the top surface of the adapter block (32), and the adapter block (32) is in contact with the cooling assembly (1).

10. The battery pack of claim 9, wherein, The top surface of the bar (2) is flush with the top surface of the adapter block (32).

11. The battery pack of claim 9, wherein, The cooling assembly (1) comprises a liquid cooling plate (11) and a thermally conductive structural adhesive (12) disposed between the liquid cooling plate (11) and a pole structure of the battery cell (100).

12. Vehicle, characterized in that A battery pack comprising the battery cell of any one of claims 9-11.

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