Cover assembly, battery and battery pack

Abstract

The present invention discloses a cover plate assembly, a battery and a battery pack. The cover plate assembly includes a cover plate, an electrode plate, a first insulating member and a second insulating member. The electrode plate is arranged on the cover plate, and the electrode plate includes a first electrode portion and a second electrode portion that are electrically connected; the first insulating member is arranged between the electrode plate and the cover plate, and the second insulating member is arranged on a side of the electrode plate away from the cover plate; the first insulating member is provided with a first through hole in an area corresponding to the first electrode portion, and the second insulating member is provided with a second through hole in an area corresponding to the second electrode portion, and the orthographic projections of the first through hole and the second through hole on the cover plate do not overlap. The present invention arranges the through holes corresponding to the electrode connection parts on the two insulating members in a staggered manner, so that when the two electrodes of the electrode plate are respectively connected to the battery cell tabs and the external electrical connectors, the welding points of the electrical connectors and the battery cell tabs and the electrode plate are not in the same height direction, which effectively reduces the adverse effects on the conductive properties of the electrode plate.

Description

Technical Field

[0001] The invention relates to a cover plate assembly, a battery and a battery pack. Background Art

[0002] At present, lithium-ion batteries basically conduct current from the inside of the battery cell shell to the outside of the battery cell shell through the pole. The traditional pole structure adopted in the top cover of most battery cells is that the outer pole of the battery cell enters the battery cell shell perpendicular to the top cover. This will make the welding points between the pole and the battery cell ear and the welding points between the pole and the external electrical connector be at the same height direction of the pole when the battery is electrically connected to the outside world. This may affect the other end of the welded pole when welding one end of the pole, thereby adversely affecting the conductive performance of the pole. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defect caused by the welding points of the battery pole, the battery cell tab in the shell and the external electrical connector being at the same height in the prior art, and to provide a cover plate assembly, a battery and a battery pack.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present invention provides a cover plate assembly, the cover plate assembly comprising

[0006] Cover plate;

[0007] An electrode plate, the electrode plate being disposed on the cover plate, the electrode plate comprising a first electrode portion and a second electrode portion being electrically connected;

[0008] a first insulating member and a second insulating member, wherein the first insulating member is disposed between the electrode plate and the cover plate, and the second insulating member is disposed on a side of the electrode plate away from the cover plate;

[0009] A first through hole is formed in a region of the first insulating member corresponding to the first electrode portion, and a second through hole is formed in a region of the second insulating member corresponding to the second electrode portion. The orthographic projections of the first through hole and the second through hole on the cover plate do not overlap.

[0010] In this solution, the cover plate assembly adopts the above structure, the electrode plate is set on the cover plate, and insulating parts are set on both sides of the electrode plate to ensure that the electrode plate and the cover plate are insulated and installed. By staggering the through holes corresponding to the electrode connection parts on the two insulating parts, the two electrodes of the electrode plate can be connected to the battery cell tabs and the external electrical connectors respectively. The welding points of the external electrical connectors and the battery cell tabs and the electrode plates are not in the same height direction, which can avoid the situation caused by the traditional pole structure that when welding one end of the pole, it will affect the other end of the welded pole, effectively reducing the adverse effects on the conductive properties of the electrode. In addition, the structure of this solution is also convenient for abutting the welding parts during welding, ensuring the stability of welding and reducing the welding defect rate.

[0011] Preferably, the first electrode portion and the second electrode portion are arranged laterally.

[0012] In the present scheme, the above-mentioned electrode plate structure is adopted, and by replacing electrode plates of different lengths, the electrode part of the electrode plate can be extended to the position of the battery cell tab and welded to the battery cell tab, thereby avoiding the defect of using adapters for electrical connection when the traditional battery cell pole column and the battery cell tab are not in the same height direction. This not only improves the production efficiency, quality rate and safety performance, avoids the increase of the internal resistance of the structural parts by connecting the pole column and the battery cell tab through adapters, further improves the power performance of the battery cell, but also can reduce the overall height of the battery pack when assembling the battery pack, thereby improving the energy density of the battery pack.

[0013] Preferably, a third through hole is provided in the area of ​​the cover plate corresponding to the first electrode portion, and the first insulating member has a first annular protrusion extending toward the cover plate at the outer periphery of the first through hole, and the outer peripheral surface of the first annular protrusion matches the inner peripheral surface of the third through hole.

[0014] In this solution, an annular protrusion is provided on the first insulating member and matched with the third through hole on the cover plate, so that the first insulating member and the cover plate maintain relative positions, thereby avoiding position deviation when the first insulating member, the electrode plate and the cover plate are assembled, thereby affecting the insulation protection of the electrode plate.

[0015] Preferably, the first electrode portion and / or the second electrode portion protrudes from the surface of the electrode plate and extends into the corresponding through hole.

[0016] In this solution, the first electrode portion or the second electrode portion protrudes outward from the surface of the electrode plate, which can facilitate welding with the electrode tab or external electrical connector, thereby improving production efficiency.

[0017] Preferably, the cover plate is provided with a groove, and the electrode plate is arranged in the groove.

[0018] In this solution, by arranging the electrode plate in the groove of the cover plate, the height of the cover plate assembly can be reduced, thereby reducing the height of the battery and improving the energy density of the battery.

[0019] Preferably, the cover plate is a plain aluminum plate, a plastic plate is provided on a side of the cover plate facing away from the electrode plate, and a through hole corresponding to the third through hole is provided on the plastic plate.

[0020] Preferably, the cover plate assembly also includes a sealing ring, which includes a main body and a flange arranged on the outer peripheral side of one end of the main body, and the two end surfaces of the flange are respectively pressed against the electrode plate and the cover plate, and the outer peripheral surface of the main body is in contact with the inner wall surface of the third through hole.

[0021] In this solution, the cover plate and the electrode plate are sealed by a sealing ring to prevent external dust and liquid from entering the battery cell shell and affecting the safety performance of the battery cell.

[0022] Preferably, the cover plate assembly further comprises a fixing plate, wherein the fixing plate is covered on a side of the electrode plate away from the cover plate, and a fourth through hole is provided in a region of the fixing plate corresponding to the second electrode portion.

[0023] In this solution, the electrode plate is pressed in the middle by setting a fixing plate, so that the joint surface of the two electrode parts of the electrode plate can avoid being subjected to a large force perpendicular to the joint surface, thereby improving the reliability of the electrode plate and reducing the overall thickness requirement of the electrode plate for welding.

[0024] Preferably, the fixing plate is provided with a receiving groove, and the outer periphery of the receiving groove is provided with an extending edge parallel to the cover plate, and the extending edge is welded and fixed to the cover plate.

[0025] In this solution, the above structure is adopted to facilitate welding and fixing the fixing plate to the cover plate.

[0026] Preferably, the second insulating member has a second annular protrusion on the outer periphery of the second through hole extending toward the fixing plate, and the outer periphery of the second annular protrusion matches the inner periphery of the fourth through hole.

[0027] In this solution, by providing a second annular protrusion on the second insulating member and matching it with the fourth through hole on the fixing plate, the fixing plate can be limited to prevent the fixing plate from moving during welding and affecting welding.

[0028] Preferably, the first insulating member and / or the second insulating member is a plastic plate.

[0029] In this solution, the first insulating member and the second insulating member are made of plastic plates, which are easy to process and have low cost.

[0030] Preferably, the first electrode portion and the second electrode portion are fixed by welding or riveting.

[0031] Preferably, the first electrode portion and the second electrode portion are two different conductive metals.

[0032] Preferably, the first electrode portion is made of copper, and the second electrode portion is made of aluminum.

[0033] Preferably, the electrode plate, the first electrode portion and the second electrode portion are integrally formed of the same metal.

[0034] The present invention also provides a battery, the battery comprising the cover plate assembly as described above;

[0035] The battery further comprises a shell and a battery cell disposed in the shell, the battery cell has a tab, the cover plate assembly is disposed on the shell, and the first electrode portion is electrically connected to the tab.

[0036] The present invention further provides a battery pack, comprising a plurality of batteries as described above, wherein the plurality of batteries are connected in series or in parallel via the second electrode portion.

[0037] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0038] The positive progressive effect of the present invention is that the cover plate assembly of the present invention sets the electrode plate on the cover plate, and sets insulating parts on both sides of the electrode plate to ensure that the electrode plate and the cover plate are insulated and installed. By staggering the through holes corresponding to the electrode connection parts on the two insulating parts, when the two electrodes of the electrode plate are respectively connected to the battery cell tabs and the external electrical connectors, the welding points of the external electrical connectors and the battery cell tabs and the electrode plates are not in the same height direction, which can avoid the situation caused by the traditional pole structure that when welding one end of the pole, the other end of the welded pole will be affected, effectively reducing the adverse effects on the conductive properties of the electrode plate. In addition, the structure of this scheme is also convenient for abutting the welding parts during welding, ensuring the stability during welding and reducing the welding defect rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the exploded structure of the cover plate assembly in Example 1 of the present invention.

[0040] Figure 2 It is a partial cross-sectional view of the cover plate assembly in Example 1 of the present invention.

[0041] Figure 3 It is a top view of the cover plate assembly in Example 1 of the present invention.

[0042] Figure 4Schematic diagram of the exploded structure of the cover plate assembly in Example 2 of the present invention.

[0043] Figure 5 Schematic diagram of the structure of the electrode plate in Example 2 of the present invention.

[0044] Description of reference numerals:

[0045] Cover 1

[0046] Groove 11

[0047] The third through hole 12

[0048] Electrode plate 2

[0049] First electrode portion 21

[0050] Second electrode portion 22

[0051] First insulating member 3

[0052] First through hole 31

[0053] Second insulating member 4

[0054] The second through hole 41

[0055] The second annular protrusion 42

[0056] Fixed plate 5

[0057] Fourth through hole 51

[0058] Extended edge 52

[0059] Sealing ring 6

[0060] Main body 61

[0061] Flange 62

[0062] Plastic sheet 7 DETAILED DESCRIPTION

[0063] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the following examples.

[0064] Example 1

[0065] like Figure 1-3As shown, this embodiment provides a cover plate assembly, which includes a cover plate 1, an electrode plate 2, a first insulating member 3 and a second insulating member 4, the electrode plate 2 is arranged on the cover plate 1, and the electrode plate 2 includes a first electrode portion 21 and a second electrode portion 22 that are electrically connected; the first insulating member 3 is arranged between the electrode plate 2 and the cover plate 1, and the second insulating member 4 is arranged on a side of the electrode plate 2 away from the cover plate 1; the first insulating member 3 is provided with a first through hole 31 in an area corresponding to the first electrode portion 21, and the second insulating member 4 is provided with a second through hole 41 in an area corresponding to the second electrode portion 22, and the orthographic projections of the first through hole 31 and the second through hole 41 on the cover plate 1 do not overlap.

[0066] The electrode plate 2 is arranged on the cover plate 1, and insulating parts are arranged on both sides of the electrode plate 2 to ensure that the electrode plate 2 is insulated and installed with the cover plate 1. By staggering the through holes corresponding to the electrode connection parts on the two insulating parts, the welding points of the external electrical connector and the battery cell ear and the electrode plate 2 are not in the same height direction when the two electrodes of the electrode plate 2 are connected to the battery cell pole ear and the external electrical connector respectively. This can not only avoid the situation caused by the traditional pole structure that when welding one end of the pole, it will affect the other end of the welded pole, and effectively reduce the adverse effect on the conductive performance of the electrode plate 2. In addition, the structure of this scheme is also convenient for abutting the welding part during welding, ensuring the stability during welding and reducing the welding defect rate. If the traditional pole structure is adopted, after one end of the pole is welded and then the other end is welded, it is necessary to abut the welded end in order to weld the other end. In this case, it will abut on the welding point, causing unstable welding and affecting the welding quality rate.

[0067] The first electrode portion 21 and the second electrode portion 22 are arranged horizontally. With the above-mentioned electrode plate 2 structure, the electrode portion of the electrode plate 2 can be extended to the position of the battery cell tab and welded to the battery cell tab by replacing the electrode plates 2 of different lengths, thereby avoiding the defect of using adapters for electrical connection when the traditional battery cell pole column and the battery cell tab are not in the same height direction, which not only improves production efficiency, quality rate and safety performance, but also avoids increasing the internal resistance of the structural parts by connecting the pole column and the battery cell tab through adapters, further improving the power performance of the battery cell. On the other hand, the horizontally arranged first electrode portion 21 and the second electrode portion 22 are different from the traditional vertically stacked electrode portions, which can reduce the thickness of the electrode, thereby reducing the overall thickness of the battery cell.

[0068] Specifically, in the present embodiment, the first electrode portion 21 and the second electrode portion 22 are both thin sheet structures and are conductive metals of two different materials. The thickness surfaces of the two thin sheets are butted and fixed by welding or riveting to form an electrode plate 2 of a flat structure. For example, in a specific scenario, the electrode plate 2 is the negative electrode of the battery, wherein the material of the first electrode portion 21 is copper, and the material of the second electrode portion 22 is aluminum. The first electrode portion 21 is made of copper to facilitate welding with the copper battery cell tab, and the second electrode portion 22 is made of aluminum to facilitate welding with the aluminum busbar. Of course, in some embodiments, the first electrode portion 21 and the second electrode portion 22 can be selected according to the material of the part to be welded.

[0069] In some embodiments, the electrode plate 2, the first electrode portion 21 and the second electrode portion 22 are integrally formed of the same metal. For example, in a specific scenario, the electrode plate 2 is the positive electrode of the battery, and the first electrode portion 21 and the second electrode portion 22 are partial regions of the electrode plate 2.

[0070] The first electrode portion 21 and the second electrode portion 22 do not protrude from the surface of the electrode plate 2. Part of the electrode plate 2 is used as the first electrode portion 21 and the second electrode portion 22, which can simplify the plate structure of the battery and save costs. In addition, when an external electrical connector needs to be connected to the second electrode portion 22, it can be inserted through the second through hole 41, and when the cell tab needs to be connected to the first electrode portion 21, it can be inserted through the first through hole 31, thereby saving space in the thickness of the entire battery.

[0071] like Figure 1 As shown, a third through hole 12 is provided in the area of ​​the cover plate 1 corresponding to the first electrode portion 21 , so as to facilitate welding of the cell tab and the first electrode portion 21 when the cover plate assembly is mounted on the shell of the cell.

[0072] In some embodiments, the outer periphery of the first through hole 31 on the first insulating member 3 has a first annular protrusion extending toward the cover plate 1, and the outer peripheral surface of the first annular protrusion matches the inner peripheral surface of the third through hole 12. By providing an annular protrusion on the first insulating member 3 and matching it with the third through hole 12 on the cover plate 1, the first insulating member 3 and the cover plate 1 are kept in relative position, avoiding position deviation when the first insulating member 3 is assembled with the electrode plate 2 and the cover plate 1, thereby affecting the insulation protection of the electrode plate 2. Among them, it is best not to extend the first annular protrusion out of the third through hole 12 to avoid interference between the first annular protrusion and the battery cell tab when the cover plate assembly is installed on the battery cell shell.

[0073] like Figure 1 As shown, the cover plate 1 is provided with a groove 11, and the electrode plate 2 is arranged in the groove 11. By arranging the electrode plate 2 in the groove 11 of the cover plate 1, the height of the cover plate assembly can be reduced, thereby reducing the height of the battery and improving the energy density of the battery.

[0074] The cover plate 1 in this embodiment has two grooves 11, which are located at both ends of the cover plate 1. The two grooves 11 are respectively provided with electrode plates 2 for electrically connecting with the positive and negative tabs of the battery cell. Of course, in some embodiments, the cover plate 1 may not be provided with grooves 11.

[0075] In this embodiment, the cover plate 1 is a plain aluminum plate, and a plastic plate 7 is provided on the side of the cover plate 1 facing away from the electrode plate 2, and a through hole corresponding to the third through hole 12 is provided on the plastic plate 7. The cover plate 1 is made of plain aluminum plate, which is not only high in strength but also easy to process. The plastic plate 7 is provided on the side of the cover plate 1 facing away from the electrode plate 2 to prevent accidental contact between the battery cell tab and the cover plate 1, which may cause leakage of the housing.

[0076] In some embodiments, the cover plate 1 may also be made of other materials. If the cover plate 1 is made of insulating material, the plastic plate 7 may not be provided.

[0077] like Figure 1 and Figure 2 As shown, the cover plate assembly further includes a sealing ring 6, which includes a main body 61 and a flange 62 provided on the outer peripheral side of one end of the main body 61. The two end surfaces of the flange 62 are respectively pressed against the electrode plate 2 and the cover plate 1, and the outer peripheral surface of the main body 61 is in contact with the inner wall surface of the third through hole 12. The sealing ring 6 is used to seal between the cover plate 1 and the electrode plate 2 to prevent external dust and liquid from entering the shell of the battery cell and affecting the safety performance of the battery cell.

[0078] The cover plate assembly further includes a fixing plate 5, which is covered on a side of the electrode plate 2 away from the cover plate 1, and a fourth through hole 51 is provided on the fixing plate 5 in an area corresponding to the second electrode portion 22. By providing the fixing plate 5 to press-fit the electrode plate 2 in the middle, the joint surface of the two electrode portions of the electrode plate 2 is prevented from being subjected to a large force perpendicular to the joint surface, thereby improving the reliability of the electrode plate 2 and reducing the overall thickness requirement of the electrode plate 2 for welding.

[0079] In this embodiment, the fixing plate 5 has a receiving groove, and the outer periphery of the receiving groove is provided with an extension edge 52 parallel to the cover plate 1, and the extension edge 52 is welded and fixed to the cover plate 1. With the above structure, it is convenient to weld and fix the fixing plate 5 to the cover plate 1.

[0080] In this embodiment, the outer periphery of the second through hole 41 on the second insulating member 4 has a second annular protrusion 42 extending toward the fixing plate 5, and the outer peripheral surface of the second annular protrusion 42 matches the inner peripheral surface of the fourth through hole 51. By providing the second annular protrusion 42 on the second insulating member 4 and matching it with the fourth through hole 51 on the fixing plate 5, the fixing plate 5 can be limited to prevent the fixing plate 5 from moving during welding and affecting the welding. Whether the second annular protrusion 42 extends out of the fourth through hole 51 can be selected according to actual conditions and is not limited here.

[0081] In some embodiments, the annular protrusion may not be provided on the second insulating member 4 .

[0082] In this embodiment, the first insulating member 3 and the second insulating member 4 are plastic plates, which are easy to process and low in cost. In other embodiments, the first insulating member 3 and the second insulating member 4 can also be made of other insulating materials.

[0083] This embodiment also provides a battery, which includes the above cover plate assembly. The battery also includes a housing and a battery cell disposed in the housing, the battery cell has a battery cell tab, the cover plate assembly is disposed on the housing, and the first electrode portion 21 is electrically connected to the battery cell tab.

[0084] This embodiment also provides a battery pack, which includes a plurality of batteries as described above, and the plurality of batteries are connected in series or in parallel through the second electrode portion 22. Specifically, the plurality of batteries are assembled into a battery pack, and a bus is used to respectively connect the second electrode portions 22 on the positive and negative electrodes of different batteries, so that the plurality of batteries are connected in series or in parallel.

[0085] Example 2

[0086] like Figure 4 and Figure 5 As shown, the structure of the cover plate assembly in this embodiment is substantially the same as that in Embodiment 1, except that: in this embodiment, the first electrode portion 21 and the second electrode portion 22 on the electrode plate 2 protrude outward from the surface of the electrode plate 2, the first electrode portion 21 extends into the first through hole 31, and the second electrode portion 22 extends into the second through hole 41. The first electrode portion 21 and the second electrode portion 22 protrude outward from the surface of the electrode plate 2 and extend into the corresponding through holes, which can facilitate welding with the tabs or external electrical connectors, thereby improving production efficiency.

[0087] In some embodiments, only the first electrode portion 21 or the second electrode portion 22 may protrude outward from the surface of the electrode plate 2 , which will not be described in detail herein.

[0088] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly includes Cover plate; An electrode plate, the electrode plate being disposed on the cover plate, the electrode plate comprising a first electrode portion and a second electrode portion being electrically connected; a first insulating member and a second insulating member, wherein the first insulating member is disposed between the electrode plate and the cover plate, and the second insulating member is disposed on a side of the electrode plate away from the cover plate; A first through hole is formed in a region of the first insulating member corresponding to the first electrode portion, and a second through hole is formed in a region of the second insulating member corresponding to the second electrode portion. The orthographic projections of the first through hole and the second through hole on the cover plate do not overlap.

2. The cover plate assembly according to claim 1, characterized in that: The first electrode portion and the second electrode portion are arranged in a transverse direction.

3. The cover plate assembly according to claim 1, characterized in that: A third through hole is provided on the cover plate in an area corresponding to the first electrode portion, and a first annular protrusion extending toward the cover plate is provided on the first insulating member at an outer peripheral edge of the first through hole, and an outer peripheral surface of the first annular protrusion matches an inner peripheral surface of the third through hole.

4. The cover plate assembly according to claim 1, characterized in that: The first electrode portion and / or the second electrode portion protrudes from the surface of the electrode plate and extends into the corresponding through hole.

5. The cover plate assembly according to claim 1, wherein: The cover plate is provided with a groove, and the electrode plate is arranged in the groove.

6. The cover plate assembly according to claim 3, characterized in that: The cover plate is a plain aluminum plate, and a plastic plate is disposed on a side of the cover plate away from the electrode plate, and a through hole corresponding to the third through hole is disposed on the plastic plate.

7. The cover plate assembly according to claim 3, characterized in that: The cover plate assembly also includes a sealing ring, which includes a main body and a flange arranged on the outer peripheral side of one end of the main body, the two end surfaces of the flange are respectively pressed against the electrode plate and the cover plate, and the outer peripheral surface of the main body is in contact with the inner wall surface of the third through hole.

8. The cover plate assembly according to claim 1, wherein: The cover plate assembly further includes a fixing plate, which is disposed on a side of the electrode plate away from the cover plate, and a fourth through hole is disposed on the fixing plate in an area corresponding to the second electrode portion.

9. The cover plate assembly according to claim 8, characterized in that: The fixing plate is provided with a receiving groove, and the outer periphery of the receiving groove is provided with an extending edge parallel to the cover plate, and the extending edge is welded and fixed to the cover plate.

10. The cover plate assembly according to claim 8, wherein: The second insulating member has a second annular protrusion on the outer periphery of the second through hole extending toward the fixing plate, and the outer periphery of the second annular protrusion matches the inner periphery of the fourth through hole.

11. The cover plate assembly according to claim 1, wherein: The first insulating member and / or the second insulating member is a plastic plate.

12. The cover plate assembly according to claim 1, wherein: The first electrode portion and the second electrode portion are fixed by welding or riveting.

13. The cover plate assembly according to any one of claims 1 to 12, characterized in that: The first electrode portion and the second electrode portion are two conductive metals of different materials.

14. The cover plate assembly according to claim 13, wherein: The first electrode portion is made of copper, and the second electrode portion is made of aluminum.

15. The cover plate assembly according to any one of claims 1 to 11, characterized in that: The electrode plate, the first electrode portion and the second electrode portion are integrally formed of the same metal.

16. A battery, characterized in that: The battery comprises a cover plate assembly as described in any one of claims 1 to 15; The battery further comprises a shell and a battery cell disposed in the shell, the battery cell has a tab, the cover plate assembly is disposed on the shell, and the first electrode portion is electrically connected to the tab.

17. A battery pack, characterized in that: The battery pack includes a plurality of batteries as claimed in claim 16, and the plurality of batteries are connected in series or in parallel via the second electrode portion.

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