Battery structure, battery module and battery pack

Abstract

The utility model relates to the technical field of energy storage batteries, and discloses a battery structure, a battery module and a battery pack, the battery structure is characterized in that a cavity is formed in a shell, and two opposite ends of the shell are opened; the partition plates are arranged in the cavity and divide the cavity into an even number of containing cavities. The pole group is arranged in the accommodating cavity; the first cover plate corresponds to one end of the shell; the second cover plate is arranged corresponding to the other end of the shell; and the plurality of pole groups are connected in series through the first cover plate and the second cover plate. According to the utility model, the plurality of pole groups are connected in series through the first cover plate and the second cover plate, so that the overall voltage of the battery structure is multiplied, and the high-voltage requirement of a product is met; the plurality of pole groups are connected in series, so that the battery structure can store more energy, and the battery structure is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to a battery structure, a battery module and a battery pack. Background Art

[0002] Lithium-ion batteries, with their high capacity, small size and mass, good cycle ability and low environmental requirements, have been widely used in electric vehicles, energy storage and other fields.

[0003] In the prior art, the voltage of the battery structure is usually limited by the tolerance range of the electrolyte, resulting in a low voltage of the battery structure. However, as the mileage and performance requirements of electric vehicles are increasing, the voltage requirements of electric vehicles for batteries are also increasing. The battery structure voltage in the prior art is relatively low and it is difficult to meet the performance requirements of the product. Utility Model Content

[0004] In view of this, the utility model provides a battery structure, a battery module and a battery pack to solve the problem that the battery structure has a low voltage and cannot meet the product performance requirements.

[0005] In the first aspect, the utility model provides a battery structure, including: an outer shell, a cavity is formed inside, and the opposite ends of the outer shell are both opened; a partition plate is arranged in the cavity, at least one partition plate is provided, and the partition plate is suitable for dividing the cavity into a plurality of accommodating cavities; a plurality of pole groups are provided, and the plurality of pole groups are arranged in a one-to-one correspondence in the plurality of accommodating cavities; a first cover plate, corresponding to one end opening of the outer shell and connected to the outer shell; a second cover plate, corresponding to the other end opening of the outer shell and connected to the outer shell; and the plurality of pole groups are arranged in series through the first cover plate and the second cover plate.

[0006] Beneficial effect: By connecting several pole groups in series through the first cover plate and the second cover plate, the overall voltage of the battery structure is increased exponentially, thereby meeting the high voltage requirements of the product; by connecting several pole groups in series, the battery structure can store more energy, which facilitates the maintenance of the battery structure.

[0007] In an optional embodiment, the first cover plate includes a first plate body and a first pole, wherein a plurality of first poles are arranged on the first plate body, wherein the plurality of first poles are electrically connected to the plurality of pole groups, wherein the two first poles of two of the pole groups located at the head end and the tail end of the plurality of pole groups arranged in series respectively form the positive pole and the negative pole of the battery structure, and the first pole of any one of the pole groups located between the head end and the tail end of the plurality of pole groups arranged in series is electrically connected to the first pole of another adjacent pole group.

[0008] In an optional embodiment, the first pole column of two of the pole groups located at the head end and the end of the plurality of pole groups arranged in series includes a base part and an extension part, the base part is electrically connected to the pole group, the extension part is electrically connected to the base part, and the extension part is detachably arranged on the first plate.

[0009] Beneficial effect: The expansion part is detachably arranged on the first plate body, and expansion parts of different heights can be selected according to actual conditions to form first poles of different heights, thereby improving the adaptability of the battery structure.

[0010] In an optional embodiment, the first cover plate further includes an insulating member, which is disposed between an outer peripheral surface of the base portion and the first plate body and between an outer peripheral surface of the extension portion and the first plate body, and the extension portion is threadedly connected to the insulating member.

[0011] Beneficial effect: By providing an insulating member, the first pole and the first plate are isolated, so as to prevent the first plate from being charged through the first pole, thereby preventing the shell from being charged through the first plate, and reducing the risk of thermal runaway caused by arcing.

[0012] In an optional embodiment, the second cover plate includes a second plate body and a second pole, wherein the second pole is disposed on the second plate body and is in plurality, wherein the plurality of second poles are electrically connected to the plurality of pole groups, respectively, and the second pole of one of the plurality of pole groups disposed in series is electrically connected to the second pole of another adjacent pole group.

[0013] In an optional embodiment, the second cover plate further includes a first connector, which connects the two second poles to electrically connect the two second poles, and the second plate body is provided with a groove, and the first connector is disposed in the groove.

[0014] In an optional embodiment, the shell is a prismatic structure.

[0015] Beneficial effect: The outer shell of the battery structure is set as a prismatic structure. When several battery structures form a battery module, it is convenient for adjacent battery structures to be close together without redundant space, thereby improving the mechanical stability of the overall structure.

[0016] In a second aspect, the utility model further provides a battery module, comprising: the above-mentioned battery structure; a second connecting member, wherein at least one second connecting member is provided, and a plurality of the battery structures are provided, and the plurality of the battery structures are connected in series via the second connecting member.

[0017] In an optional embodiment, the battery module further includes a heat insulating member, and the heat insulating member is disposed between two adjacent battery structures.

[0018] Beneficial effect: By providing a heat insulating member, the heat transfer between the battery structures can be effectively isolated, and the temperature gradient within the battery module can be reduced, thereby avoiding the degradation of battery module performance or safety hazards caused by local overheating.

[0019] In a third aspect, the utility model also provides a battery pack, comprising the above-mentioned battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the battery structure of an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A top view of the housing and the partition plate in direction A shown;

[0023] Figure 3 A top view of a battery module according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of a first cover plate according to an embodiment of the utility model;

[0025] Figure 5 A bottom view of a battery module according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic structural diagram of a second cover plate according to an embodiment of the utility model;

[0027] Figure 7 The figure is a schematic diagram of the shell connection of a battery module in the prior art.

[0028] Description of reference numerals:

[0029] 10. Shell; 20. Partition plate; 30. Pole group; 40. First cover plate; 41. First plate body; 42. First pole; 421. Base portion; 422. Extension portion; 43. Insulator; 50. Second cover plate; 51. Second plate body; 52. Second pole; 53. First connector; 60. Second connector; 70. Heat insulating member. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] Combine the following Figures 1 to 7 , describing an embodiment of the utility model.

[0032] According to an embodiment of the utility model, in the first aspect, a battery structure is provided, including a shell 10, a partition plate 20, a pole group 30, a first cover plate 40 and a second cover plate 50. A cavity is formed inside the shell 10, and both opposite ends of the shell 10 are opened; the partition plate 20 is arranged in the cavity, and at least one partition plate 20 is arranged, and the partition plate 20 is suitable for dividing the cavity into a plurality of accommodating cavities; there are a plurality of pole groups 30, and a plurality of pole groups 30 are arranged in a one-to-one correspondence in a plurality of accommodating cavities; the first cover plate 40 is arranged corresponding to one end opening of the shell 10 and connected to the shell 10; the second cover plate 50 is arranged corresponding to the other end opening of the shell 10 and connected to the shell 10; a plurality of pole groups 30 are arranged in series through the first cover plate 40 and the second cover plate 50.

[0033] By using the battery structure of this embodiment, a plurality of electrode groups 30 are connected in series through the first cover plate 40 and the second cover plate 50, so that the overall voltage of the battery structure is increased exponentially, thereby meeting the high voltage requirements of the product; a plurality of electrode groups 30 are connected in series, so that the battery structure can store more energy and facilitates the maintenance of the battery structure.

[0034] In one embodiment, Figure 2 and Figure 7 As shown, the thickness of the partition plate 20 is w, and the thickness of the wall plate of the housing 10 is W, satisfying w<2W.

[0035] Please note that Figure 7 In the related art, the battery structure is provided with only one accommodating cavity. After the adjacent battery structures are connected, the thickness of the structure between two adjacent accommodating cavities is the thickness of the two wall panels of the housing 10 (i.e., 2W). Compared with the related art, the thickness of the structure between two adjacent accommodating cavities of the battery structure in this embodiment (i.e., the thickness w of the partition plate 20) is smaller, which is equivalent to reducing the weight of the structural parts and reducing the space occupied.

[0036] Preferably, the thickness w of the partition plate 20 is equal to the thickness W of the wall of the housing 10, that is, w=W. The cavity is separated by the partition plate 20, and the thickness of the partition plate 20 is the same as the thickness of the wall of the housing 10, that is, two adjacent accommodating cavities adopt a common edge method, thereby reducing the thickness of the structural member between the two adjacent accommodating cavities, thereby reducing the weight of the battery structure; reducing the volume of the battery structure, thereby reducing the space occupied by the battery structure in the battery pack, and more battery structures can be arranged in the battery pack to increase the total energy of the battery pack.

[0037] It should be noted that, according to the series connection sequence of the electrode groups 30 , the electrical properties of the same side of two adjacent electrode groups 30 are opposite.

[0038] It should be noted that a plurality of electrode groups 30 are connected in series, so that the operating voltage of the battery structure can be increased.

[0039] Specifically, in this embodiment, the first cover plate 40 is the upper cover plate of the battery structure shown in the figure, and the second cover plate 50 is the lower cover plate of the battery structure shown in the figure.

[0040] In one embodiment, Figure 1 and Figure 2 As shown, the housing 10 is a prismatic structure. The housing 10 of the battery structure is set to a prismatic structure. When several battery structures form a battery module, it is convenient for adjacent battery structures to be close together, thereby improving the mechanical stability of the overall structure; there is no extra space between adjacent battery structures, and the battery pack has high space utilization and high energy density.

[0041] For details, please refer to Figure 2 The partition plate 20 divides the outer shell 10 into two hexagonal prism shells with common sides. Correspondingly, the first cover plate 40 and the second cover plate 50 are both formed by splicing two hexagonal plates, and the outer contour side length of the hexagonal plate is L, satisfying 10mm≤L≤200mm.

[0042] In one embodiment, Figure 4 As shown, the first cover plate 40 includes a first plate body 41 and a first pole 42. The first pole 42 is arranged on the first plate body 41 and is provided in plurality. The plurality of first poles 42 are electrically connected to the plurality of pole groups 30. The two first poles 42 of two pole groups 30 located at the head end and the tail end of the plurality of pole groups 30 arranged in series respectively form the positive pole and the negative pole of the battery structure. The first pole 42 of any pole group located between the head end and the tail end of the plurality of pole groups 30 arranged in series is electrically connected to the first pole 42 of another pole group 30 adjacent thereto.

[0043] Specifically, in this embodiment, the first plate body 41 is a plain aluminum plate.

[0044] In one embodiment, Figure 4 As shown, the first pole 42 of two pole groups 30 located at the head end and the tail end of the plurality of pole groups 30 arranged in series includes a base portion 421 and an extension portion 422, the base portion 421 is electrically connected to the pole group 30, the extension portion 422 is electrically connected to the base portion 421, and the extension portion 422 is detachably arranged on the first plate body 41. The extension portion 422 is detachably arranged on the first plate body 41, and the extension portions 422 of different heights can be selected according to actual conditions to form first poles 42 of different heights, thereby improving the adaptability of the battery structure.

[0045] Specifically, the outer wall of the expansion part 422 is provided with threads. By providing threads on the outer wall of the expansion part 422, when the battery structure is grouped, the threads on the outer wall of the expansion part 422 are used to achieve a detachable connection with the connector, and at the same time, it is convenient to improve the efficiency of the battery structure grouping.

[0046] It should be noted that in the related art, when multiple battery structures are grouped, the busbars of two adjacent battery structures are laser welded to achieve electrical connection between the two adjacent battery structures. Laser welding increases the difficulty of rework and disassembly of the battery pack and replacement and disassembly of the battery structure. Therefore, this embodiment uses a threaded expansion portion 422 to facilitate detachable connection and quick assembly and disassembly between battery structures.

[0047] In one embodiment, Figure 4 As shown, the first cover plate further includes an insulating member 43, which is disposed between the outer circumference of the base portion 421 and the first plate body 41 and between the outer circumference of the extension portion 422 and the first plate body 41, and the extension portion 422 is threadedly connected to the insulating member 43. By providing the insulating member 43, the first pole 42 and the first plate body 41 are isolated, and the first plate body 41 is prevented from being charged through the first pole 42, thereby preventing the housing 10 from being charged through the first plate body 41, and reducing the risk of thermal runaway caused by arcing.

[0048] Specifically, the inner wall of the insulating member 43 is provided with threads.

[0049] In one embodiment, Figure 6 As shown, the second cover plate 50 includes a second plate body 51 and a second pole 52. The second pole 52 is arranged on the second plate body 51 and is provided in plurality. The plurality of second poles 52 are electrically connected to the plurality of pole groups 30 respectively. The second pole 52 of one pole group 30 among the plurality of pole groups 30 arranged in series is electrically connected to the second pole 52 of another pole group 30 adjacent thereto.

[0050] Specifically, in this embodiment, the height of the pole group 30 is h1, satisfying 30 mm ≤ h1 ≤ 1000 mm; the thickness of the first plate 41 is h2, satisfying 0.05 mm ≤ h2 ≤ 20 mm; the thickness of the second plate 51 is h3, satisfying 0.05 mm ≤ h3 ≤ 20 mm.

[0051] In one embodiment, Figure 6 As shown, the second cover plate 50 further includes a first connector 53 , which connects the two second poles 52 to electrically connect the two second poles 52 . The second plate body 51 is provided with a groove, and the first connector 53 is disposed in the groove.

[0052] It should be noted that the side of the first connecting member 53 facing away from the electrode group 30 is the lower surface of the first connecting member 53 , and the side of the second cover plate 50 facing away from the electrode group 30 is the lower surface of the second cover plate 50 .

[0053] For details, please refer to Figure 6 The first connecting member 53 is embedded in the groove, and the lower surface of the first connecting member 53 is flush with the lower surface of the second cover plate 50.

[0054] It should be noted that if the first connector 53 protrudes from the lower surface of the second cover plate 50, the height of the battery structure will increase, the space occupied by the battery structure in the battery pack will increase, and the effective utilization rate of the space in the battery pack will be reduced; if the first connector 53 is recessed in the lower surface of the second cover plate 50, there will be extra space between the first connector 53 and the second cover plate 50, and the extra space is easy to hide dirt and dirt, affecting the performance of the battery structure. Therefore, the lower surface of the first connector 53 is set flush with the lower surface of the second cover plate 50.

[0055] It is worth noting that, in the present embodiment, one partition plate 20 is provided, and one partition plate 20 divides the cavity into two accommodating cavities. Correspondingly, two electrode groups 30 and two first poles 42 are provided, and the two electrode groups 30 are respectively arranged in the two accommodating cavities. One first pole 42 is connected to the positive electrode of the first electrode group 30 to form the positive electrode of the battery structure, and the other first pole 42 is connected to the negative electrode of the second electrode group 30 to form the negative electrode of the battery structure. The negative electrode of the first electrode group 30 is connected to the positive electrode of the second electrode group 30 to realize the series connection of the electrode groups 30.

[0056] It should be further explained that in other alternative embodiments, the number of the electrode groups 30 is greater than two. In this case, a plurality of partition plates 20 are provided, and the cavity is divided into a plurality of accommodating cavities by the plurality of partition plates 20. For the convenience of description, the plurality of electrode groups 30 are named according to the series connection sequence of the electrode groups 30, namely A1, A2...An-1, An, that is, A1 is the head end of the plurality of electrode groups 30 arranged in series, and An is the end end of the plurality of electrode groups 30 arranged in series.

[0057] Specifically, a first pole 42 is connected to the positive pole of A1 to form the positive pole of the battery structure, the negative pole of A1 is connected to the positive pole of A2, the negative pole of A2 is connected to the positive pole of A3, and so on, the negative pole of An-1 is connected to the positive pole of An, and a first pole 42 is connected to the negative pole of An to form the negative pole of the battery structure.

[0058] According to an embodiment of the utility model, in a second aspect, a battery module is further provided, comprising: the above-mentioned battery structure and a second connecting member 60, wherein at least one second connecting member 60 is provided, and a plurality of battery structures are provided, and the plurality of battery structures are connected in series through the second connecting member 60.

[0059] It should be noted that, for the convenience of description, several battery structures are named according to the series connection order of the battery structures, namely B1, B2...Bn-1, Bn.

[0060] Specifically, the positive electrode of B1 forms the positive electrode of the battery module, the negative electrode of B1 is connected to the positive electrode of B2 through the second connecting member 60, the negative electrode of B2 is connected to the positive electrode of B3 through the second connecting member 60, and so on, the negative electrode of Bn-1 is connected to the positive electrode of Bn through the second connecting member 60, and the negative electrode of Bn forms the negative electrode of the battery module.

[0061] In one embodiment, Figure 3 and Figure 5 As shown, the battery module further includes a heat insulating member 70, which is disposed between two adjacent battery structures, and a plurality of heat insulating members 70 are provided. By providing the heat insulating member 70, the heat transfer between the battery structures is effectively isolated, and the temperature gradient in the battery module is reduced, thereby avoiding the degradation of battery module performance or safety hazards caused by local overheating.

[0062] It should be noted that the battery structure generates a lot of heat during the discharge process. When a certain temperature is reached, it will affect the performance and life of the battery and may even cause a safety accident. Therefore, it is necessary to set a heat insulation member 70 to prevent heat transfer between the battery structures and prevent local overheating of the battery module.

[0063] According to an embodiment of the present utility model, in a third aspect, a battery pack is also provided, comprising the above-mentioned battery module.

[0064] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery structure, characterized in that: include: A shell having a cavity formed therein, and two opposite ends of the shell are both opened; A partition plate is disposed in the cavity, at least one partition plate is provided, and the partition plate is suitable for dividing the cavity into a plurality of accommodating cavities; A plurality of pole groups are provided, and the plurality of pole groups are arranged in a one-to-one correspondence in the plurality of accommodating cavities; A first cover plate, arranged corresponding to an opening at one end of the shell and connected to the shell; The second cover plate is arranged corresponding to the other end opening of the shell and is connected to the shell; a plurality of the pole groups are arranged in series through the first cover plate and the second cover plate.

2. The battery structure according to claim 1, characterized in that: The first cover plate includes a first plate body and a first pole, wherein the first pole is arranged on the first plate body and is provided in plurality, wherein the plurality of first poles are electrically connected to the plurality of pole groups, wherein the two first poles of two of the pole groups located at the head end and the tail end of the plurality of pole groups arranged in series respectively form the positive pole and the negative pole of the battery structure, and wherein the first pole of any one of the pole groups located between the head end and the tail end of the plurality of pole groups arranged in series is electrically connected to the first pole of another adjacent pole group.

3. The battery structure according to claim 2, characterized in that: The first pole column of two of the pole groups located at the head end and the tail end among the plurality of pole groups arranged in series includes a base part and an extension part, the base part is electrically connected to the pole group, the extension part is electrically connected to the base part, and the extension part is detachably arranged on the first plate.

4. The battery structure according to claim 3, characterized in that: The first cover plate further includes an insulating member, which is disposed between the outer circumferential surface of the base portion and the first plate body and between the outer circumferential surface of the extension portion and the first plate body, and the extension portion is threadedly connected to the insulating member.

5. The battery structure according to any one of claims 1 to 4, characterized in that: The second cover plate includes a second plate body and a second pole. The second pole is arranged on the second plate body and is provided in plurality. The plurality of second poles are electrically connected to the plurality of pole groups respectively. The second pole of one of the plurality of pole groups arranged in series is electrically connected to the second pole of another adjacent pole group.

6. The battery structure according to claim 5, characterized in that: The second cover plate further includes a first connector, which connects the two second poles to electrically connect the two second poles. The second plate body is provided with a groove, and the first connector is disposed in the groove.

7. The battery structure according to any one of claims 1 to 4, characterized in that: The shell is a prismatic structure.

8. A battery module, characterized in that: include: The battery structure according to any one of claims 1 to 7; A second connecting member, at least one of which is provided, a plurality of which are provided for the battery structure, and the plurality of the battery structures are connected in series via the second connecting member.

9. The battery module according to claim 8, characterized in that: The battery module further includes a heat insulating member, which is disposed between two adjacent battery structures.

10. A battery pack, characterized in that: A battery module comprising any one of claims 8 to 9.

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