Energy storage battery

Abstract

The utility model relates to the technical field of batteries, in particular to an energy storage battery which comprises a shell, a battery cell, a first insulating heat conduction component and a second insulating heat conduction component, the battery cell comprises positive plates and negative plates which are alternately stacked together, and a diaphragm is arranged between any adjacent positive plate and negative plate; a tab cluster is formed at at least one end of the battery cell along the height direction of the battery cell, and the first insulating heat-conducting component is arranged at one end, where the tab cluster is formed, of the battery cell; a first insulating heat-conducting component is arranged between any adjacent positive plate and negative plate, and the plurality of first insulating heat-conducting components are connected together through a second insulating heat-conducting component. Therefore, the first insulating heat-conducting component can quickly transfer heat generated at the connecting part of the tab and the pole piece to the second insulating heat-conducting component, and the heat is quickly transferred to the shell by the second insulating heat-conducting component, so that the influence of the heat on the diaphragm is reduced, the service life of the diaphragm is prolonged, and the compression resistance and deformation resistance of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an energy storage battery. Background Art

[0002] At present, energy storage batteries are a type of equipment that stores electrical energy to solve problems such as unstable and discontinuous power. Energy storage batteries have broad application prospects in the fields of power peak regulation, electric vehicles, household and industrial energy storage, etc. The battery cell of an energy storage battery is the core part of the energy storage battery. At present, the battery cell of an energy storage battery is usually formed by stacking or winding positive and negative electrode sheets, which are separated by a diaphragm, and the pole ears are welded on the positive and negative electrode sheets respectively. The battery cell is encapsulated in a battery shell and a battery cover to form an energy storage battery. However, welding the pole ears on the pole sheets will reduce the contact area between the pole ears and the pole sheets, but the current flowing through is large, which will cause the contact part between the pole ears and the pole sheets to quickly generate a large amount of heat energy during the charging process. The generated heat energy will be transferred to the diaphragm, which is easy to cause the diaphragm to be damaged, affecting the safety of the battery cell when in use. Utility Model Content

[0003] The purpose of the present application is to provide an energy storage battery, which to a certain extent solves the technical problem that welding pole ears on pole pieces in the prior art will reduce the contact area between the pole ears and the pole pieces, but the current flowing through is large, and then during the charging process, a large amount of heat energy will be quickly generated at the contact part between the pole ears and the pole pieces, and the generated heat energy will be transferred to the diaphragm, which may easily cause the diaphragm to be damaged and affect the safety of the battery cell when used.

[0004] The present application provides an energy storage battery, comprising: a shell, a battery core, a first insulating heat-conducting component and a second insulating heat-conducting component; the battery core comprises positive electrode sheets and negative electrode sheets stacked alternately, and a diaphragm is provided between any adjacent positive electrode sheets and negative electrode sheets;

[0005] A tab cluster is formed at at least one end of the battery core along the height direction thereof, and the first insulating heat-conducting member is disposed at the end of the battery core where the tab cluster is formed;

[0006] The first insulating heat-conducting component is disposed between any adjacent positive electrode sheets and negative electrode sheets, and a plurality of the first insulating heat-conducting components are connected together via the second insulating heat-conducting component.

[0007] In the above technical solution, further, the first insulating heat-conducting component is connected to the adjacent positive electrode sheet and the negative electrode sheet by gluing.

[0008] In any of the above technical solutions, further, along the height direction of the battery core, the diaphragm and the first insulating heat-conducting component are connected to or overlapped with each other.

[0009] In any of the above technical solutions, further, along a direction perpendicular to the stacking direction of the positive electrode sheet and the negative electrode sheet, the second insulating heat-conductive component is arranged on one side of the battery core.

[0010] In any of the above technical solutions, further, the second insulating heat-conducting component is connected to the adjacent positive electrode sheet and the negative electrode sheet by gluing.

[0011] In any of the above technical solutions, further, the energy storage battery also includes a conductive component, the pole lug cluster includes a plurality of pole lugs arranged in sequence and at intervals, and the conductive component is arranged between any two adjacent pole lugs.

[0012] In any of the above technical solutions, further, the conductive component abuts against an end of the first insulating and heat-conductive component that is away from the battery core.

[0013] In any of the above technical solutions, further, the energy storage battery also includes a protective cover, the battery cell and the protective cover are both installed in the shell, and the protective cover at least covers two major sides of the battery cell to resist deformation of the battery cell.

[0014] In any of the above technical solutions, further, the protective cover includes a first protective plate, a second protective plate and a connecting plate; wherein the first protective plate and the second protective plate are respectively connected to two sides of the connecting plate to form a U-shaped structure;

[0015] Along the stacking direction of the positive electrode sheets and the negative electrode sheets, the first protective plate is arranged on one side of the battery cell, and the second protective plate is arranged on the other opposite side of the battery cell; along the direction perpendicular to the stacking direction of the positive electrode sheets and the negative electrode sheets, the connecting plate is arranged on one side of the battery cell.

[0016] In any of the above technical solutions, further, a gap is formed between the protective cover and the battery cell.

[0017] In any of the above technical solutions, further, the material of the protective cover is metal.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] In the present application, a first insulating heat-conducting component and a second insulating heat-conducting component are added. The first insulating heat-conducting component can quickly transfer the heat generated at the connection between the pole ear and the pole piece to the second insulating heat-conducting component, and the heat is quickly transferred to the shell by the second insulating heat-conducting component, thereby quickly transferring the heat generated at the connection between the pole ear and the pole piece, reducing the impact of heat on the diaphragm and helping to extend the service life of the diaphragm.

[0020] In addition, the first insulating heat-conducting component and the second insulating heat-conducting component are connected together, which can also improve the strength and rigidity of the end of the battery, play a role in resisting compression and deformation, and help to improve the service life and safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application 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 present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of a partial structure of an energy storage battery provided in an embodiment of the present application;

[0023] Figure 2 Another schematic diagram of the structure of the energy storage battery provided in the embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a first insulating heat-conducting component and a second insulating heat-conducting component provided in an embodiment of the present application;

[0025] Figure 4 Another structural schematic diagram of the first insulating heat-conducting component and the second insulating heat-conducting component provided in an embodiment of the present application;

[0026] Figure 5 Another structural schematic diagram of the first insulating heat-conducting component and the second insulating heat-conducting component provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of another partial structure of the energy storage battery provided in an embodiment of the present application.

[0028] Reference numerals:

[0029] 1-battery cell, 11-positive electrode sheet, 111-positive electrode ear, 12-negative electrode sheet, 121-negative electrode ear, 13-diaphragm, 2-first insulating heat-conducting component, 3-second insulating heat-conducting component, 4-first conductive component, 5-second conductive component, 6-protective cover, 61-first protective plate, 62-second protective plate, 63-connecting plate. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0032] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 6 An energy storage battery according to some embodiments of the present application is described.

[0036] See also Figures 1 to 5 As shown, an embodiment of the present application provides an energy storage battery, comprising: a shell, a battery core 1, a first insulating heat-conducting member 2, and a second insulating heat-conducting member 3; the battery core 1 comprises positive electrode sheets 11 and negative electrode sheets 12 alternately stacked together along a preset direction, and a separator 13 is provided between any adjacent positive electrode sheets 11 and negative electrode sheets 12;

[0037] A pole lug cluster is formed at at least one end of the battery cell 1 along its height direction, and a first insulating heat-conductive component 2 is arranged at the end of the battery cell 1 where the pole lug cluster is formed; a first insulating heat-conductive component 2 is arranged between any adjacent positive electrode sheets 11 and negative electrode sheets 12, and multiple first insulating heat-conductive components 2 are connected together via a second insulating heat-conductive component 3.

[0038] According to the structure described above, the first insulating heat-conducting component 2 and the second insulating heat-conducting component 3 are added in the present application. The first insulating heat-conducting component 2 can quickly transfer the heat generated at the connection between the pole ear and the pole piece to the second insulating heat-conducting component 3, and the second insulating heat-conducting component 3 can quickly transfer the heat generated at the connection between the pole ear and the pole piece to the housing, thereby quickly transferring the heat generated at the connection between the pole ear and the pole piece away, reducing the influence of heat on the diaphragm 13, and helping to extend the service life of the diaphragm 13. In addition, the first insulating heat-conducting component 2 and the second insulating heat-conducting component 3 are connected together, which can also improve the strength and rigidity of the end of the battery, play a role in resisting compression and deformation, and help to improve the service life and safety performance of the battery.

[0039] It should be noted that: in this embodiment, Figure 1 As shown, two pole ear clusters are formed at the same end of the battery cell 1 along its height direction, one of which is a positive pole ear cluster, and the other is a negative pole ear cluster. The positive pole ear cluster includes a plurality of positive pole ears 111 sequentially spaced along a preset direction, that is, a positive pole ear 111 is welded to the top of each positive electrode sheet 11, and the negative pole ear cluster includes a plurality of negative pole ears 121 sequentially spaced along a preset direction, that is, a negative pole ear 121 is welded to the top of each negative electrode sheet 12. Therefore, the first insulating heat-conducting component 2 and the second insulating heat-conducting component 3 can be arranged at the same end of the battery cell 1 along its height direction, such as the top.

[0040] Of course, it is not limited to this. When the two ends of the battery cell 1 have tabs, that is, along the height direction of the battery cell 1, the two ends of the battery cell 1, such as the top and the bottom, respectively form a tab cluster, that is, there are still two tab clusters, but they are respectively arranged at the two ends of the battery cell 1, one of which is a positive tab cluster, and the other is a negative tab cluster. In this case, it is necessary to set the first insulating heat conductive component 2 and the second insulating heat conductive component 3 at both ends of the battery cell 1 to protect the diaphragm 13, and the specific design is based on actual needs. Of course, it is not limited to this. Even if the two ends of the battery cell 1 have tabs, it is also possible to choose to only equip one end with the first insulating heat conductive component 2 and the second insulating heat conductive component 3, while the other end is not equipped with the first insulating heat conductive component 2 and the second insulating heat conductive component 3.

[0041] In this embodiment, preferably, Figure 2As shown, the first insulating heat-conducting component 2 is connected to the adjacent positive electrode sheet 11 and the negative electrode sheet 12 by gluing.

[0042] According to the structure described above, the first insulating heat-conducting component 2 is glued together with the adjacent positive electrode sheet 11 and negative electrode sheet 12, so that the overall structure is more stable and stronger, and the displacement of the second insulating heat-conducting component 3 is avoided.

[0043] In this embodiment, preferably, Figure 2 As shown, along the height direction of the battery core 1, the diaphragm 13 is in contact with the first insulating heat-conducting component 2 to avoid the generation of a gap, thereby playing a better role in insulation protection.

[0044] It should be noted that: the diaphragm 13 is not limited to being connected to the first insulating heat-conducting component 2 along the height direction of the battery core 1 as mentioned above, and other structures can also be used. For example: along the height direction of the battery core 1, the diaphragm 13 and the first insulating heat-conducting component 2 overlap together, and the overlapping part can play a better role in insulation protection.

[0045] In this embodiment, preferably, Figure 2 As shown, the second insulating thermally conductive member 3 is disposed on one side of the battery cell 1 along a direction perpendicular to the stacking direction of the positive electrode sheet 11 and the negative electrode sheet 12 .

[0046] According to the structure described above, the second insulating heat-conducting member 3 is arranged on the side of the battery core 1 to avoid occupying the top space and is not easy to interfere with the connecting piece and other structures on the cover plate.

[0047] In this embodiment, preferably, Figure 2 As shown, the second insulating heat-conducting component 3 is connected to the adjacent positive electrode sheet 11 and the negative electrode sheet 12 by gluing.

[0048] According to the structure described above, the second insulating heat-conducting component 3 is glued together with the adjacent positive electrode sheet 11 and negative electrode sheet 12, so that the overall structure is more stable and firm, and the displacement of the second insulating heat-conducting component 3 is avoided.

[0049] In this embodiment, preferably, Figures 2 to 5 As shown, the number of the second insulating heat-conducting component 3 is one, but it is not limited thereto. The number of the second insulating heat-conducting component 3 can also be two, for example Figure 6 As shown, along a direction perpendicular to the preset direction, two second insulating heat-conducting components 3 are respectively arranged on both sides of the battery core 1, and are specifically designed according to actual needs.

[0050] In this embodiment, preferably, Figures 3 to 5As shown, the first insulating heat-conducting component 2 and the second insulating heat-conducting component 3 can be an integrated structure, and the overall strength and rigidity are good, and the ability to resist deformation can also be played. Of course, not limited to this, the first insulating heat-conducting component 2 and the second insulating heat-conducting component 3 can also be a split structure, and then assembled together by gluing, hot melting or other methods, and the specific design is based on actual needs.

[0051] In this embodiment, preferably, Figures 3 to 5 As shown, the first insulating heat-conducting member 2 and the second insulating heat-conducting member 3 are both rectangular plates with regular shapes, which are convenient for processing and manufacturing, and are convenient for later assembly with the positive electrode sheet 11 and the negative electrode sheet 12, thereby improving assembly accuracy and efficiency. Of course, this is not limited to this, and the structures of the first insulating heat-conducting member 2 and the second insulating heat-conducting member 3 can also be designed according to actual needs.

[0052] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the energy storage battery also includes a conductive component. The pole ear cluster includes a plurality of pole ears arranged in sequence and at intervals, and a conductive component is provided between any two adjacent pole ears. For ease of understanding, the conductive components provided for the positive pole ear 111 and the negative pole ear 121 at different positions are named separately. The conductive component provided for the positive pole ear 111 is called the first conductive component 4, and the conductive component provided for the negative pole ear 121 is called the second conductive component 5.

[0053] Among them, preferably, the positive electrode ear 111 of the positive electrode sheet 11 extends through the gap between adjacent first insulating heat-conducting components 2, and a first conductive component 4 is arranged between any two adjacent positive electrode ears 111, and the first conductive component 4 abuts against the end of the first insulating heat-conducting component 2 facing away from the battery cell 1.

[0054] According to the structure described above, it can be known that the first conductive component 4 is arranged between any two adjacent positive electrode tabs 111 to increase the contact area of ​​the two positive electrode tabs 111 and thus improve the current carrying capacity.

[0055] Further, preferably, the first conductive component 4 is a rectangular plate, but is not limited thereto and can be designed according to actual needs.

[0056] In this embodiment, preferably, the negative electrode ear 121 of the negative electrode sheet 12 extends through the gap between adjacent first insulating heat-conducting members 2, and a second conductive member 5 is provided between any two adjacent negative electrode ears 121, and the second conductive member 5 abuts against the end of the first insulating heat-conducting member 2 away from the battery cell 1 (it should be noted that the negative electrode ear 121 is not Figure 2 As shown in Figure 2 The structure of the positive electrode ear 111).

[0057] According to the structure described above, it can be known that the second conductive component 5 is disposed between any two adjacent negative electrode tabs 121 to increase the contact area of ​​the two negative electrode tabs 121 and thus improve the current carrying capacity.

[0058] Further, preferably, the second conductive component 5 is a rectangular plate, but is not limited thereto and can be designed according to actual needs.

[0059] In this embodiment, preferably, Figure 2 As shown, the energy storage battery further includes a protective cover 6 , the battery cell 1 and the protective cover 6 are both installed in the shell, and the protective cover 6 at least covers two major sides of the battery cell 1 to resist deformation of the battery cell 1 .

[0060] According to the structure described above, the large surface side of the battery cell 1 is the main deformation surface, so the protective cover 6 is set on the two large surface sides, which can resist the deformation of the large surface sides and will not cause problems such as damage to the diaphragm 13, which helps to improve the service life and performance of the battery.

[0061] It should be noted that the large surface side of the battery cell 1 specifically refers to a surface perpendicular to the stacking direction of the positive electrode sheet 11 and the negative electrode sheet 12 .

[0062] In this embodiment, preferably, Figure 2 As shown, the protective cover 6 includes a first protective plate 61, a second protective plate 62 and a connecting plate 63; wherein the first protective plate 61 and the second protective plate 62 are respectively connected to two sides of the connecting plate 63 to form a U-shaped structure;

[0063] Along the stacking direction of the positive electrode sheet 11 and the negative electrode sheet 12, the first protective plate 61 is arranged on one side of the battery cell 1, and the second protective plate 62 is arranged on the other opposite side of the battery cell 1; along the direction perpendicular to the stacking direction of the positive electrode sheet 11 and the negative electrode sheet 12, the connecting plate 63 is arranged on one side of the battery cell 1.

[0064] According to the structure described above, the protective plates on the opposite sides of the protective cover 6 can not only resist the deformation of the left and right sides of the battery cell 1, but the two side protective plates can also be fixed together by the connecting plate 63, which greatly improves the overall strength and rigidity, and has stronger anti-deformation ability.

[0065] It should be noted that the structure of the protective cover 6 is not limited to the U-shape, and the protective cover 6 can also adopt other structures, such as: Figure 6 As shown, the protective cover 6 includes a first protective plate 61, a second protective plate 62 and two connecting plates 63. The connection form of the first protective plate 61, the second protective plate 62 and one of the connecting plates 63 is the same as the aforementioned U-shaped protective cover 6, wherein the other connecting plate 63 is connected to the open end of the U-shaped structure to form a ring structure, which is sleeved on the entire periphery of the battery cell 1.

[0066] In this embodiment, preferably, a gap is formed between the protective cover 6 and the battery cell 1 .

[0067] According to the structure described above, a gap is designed between the protective cover 6 and the battery cell 1 to facilitate the electrolyte to be filled around the battery cell 1 and to provide a deformation cavity for the protective cover 6 to improve the use effect of the protective cover 6.

[0068] In this embodiment, preferably, the material of the protective cover 6 is metal.

[0069] According to the structure described above, the protective cover 6 made of metal material can play a role of rapid heat conduction, which is helpful for heat dissipation of the battery cell 1, thereby improving the service life and performance of the battery cell 1.

[0070] Furthermore, preferably, the protective cover 6 can be an aluminum plate or a steel plate, etc. Of course, it is not limited thereto, and the material can be selected according to actual needs.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An energy storage battery, characterized in that: include: A shell, a battery core, a first insulating heat-conducting component and a second insulating heat-conducting component; the battery core comprises positive plates and negative plates alternately stacked together, and a diaphragm is provided between any adjacent positive plates and negative plates; A tab cluster is formed at at least one end of the battery core along the height direction thereof, and the first insulating heat-conducting member is disposed at the end of the battery core where the tab cluster is formed; The first insulating heat-conducting component is disposed between any adjacent positive electrode sheets and negative electrode sheets, and a plurality of the first insulating heat-conducting components are connected together via the second insulating heat-conducting component.

2. The energy storage battery according to claim 1, characterized in that: The first insulating heat-conducting component is connected to the adjacent positive electrode sheet and the adjacent negative electrode sheet by gluing.

3. The energy storage battery according to claim 1, characterized in that: Along the height direction of the battery core, the diaphragm and the first insulating heat-conducting component are in contact with or overlapped with each other.

4. The energy storage battery according to claim 1, characterized in that: The second insulating heat-conductive member is disposed on one side of the battery core along a direction perpendicular to a stacking direction of the positive electrode sheet and the negative electrode sheet.

5. The energy storage battery according to claim 1, characterized in that: The second insulating heat-conducting component is connected to the adjacent positive electrode sheet and the adjacent negative electrode sheet by gluing.

6. The energy storage battery according to claim 1, characterized in that: The energy storage battery further includes a conductive component. The pole lug cluster includes a plurality of pole lugs that are sequentially spaced apart, and the conductive component is disposed between any two adjacent pole lugs.

7. The energy storage battery according to claim 6, characterized in that: The conductive component abuts against an end of the first insulating thermally conductive component that is away from the battery core.

8. The energy storage battery according to any one of claims 1 to 7, characterized in that: The energy storage battery further includes a protective cover. The battery cell and the protective cover are both installed in the shell, and the protective cover at least covers two major sides of the battery cell to resist deformation of the battery cell.

9. The energy storage battery according to claim 8, characterized in that: The protective cover comprises a first protective plate, a second protective plate and a connecting plate; wherein the first protective plate and the second protective plate are respectively connected to two sides of the connecting plate to form a U-shaped structure; Along the stacking direction of the positive electrode sheets and the negative electrode sheets, the first protective plate is arranged on one side of the battery cell, and the second protective plate is arranged on the other opposite side of the battery cell; along the direction perpendicular to the stacking direction of the positive electrode sheets and the negative electrode sheets, the connecting plate is arranged on one side of the battery cell.

10. The energy storage battery according to claim 8, characterized in that: A gap is formed between the protective cover and the battery core; and / or the protective cover is made of metal.

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