Battery pack assembly, battery and preparation method of battery pack assembly

Abstract

The invention discloses a battery pack assembly, a battery and a preparation method of the battery pack assembly. The battery pack assembly comprises a metal cover plate, a first insulating part and a first connecting part, the metal cover plate comprises more than two electric connection parts, and the electric connection parts are arranged at intervals and are electrically connected with the metal cover plate. The first insulating part is connected with the inner surface of the metal cover plate, and the first insulating part is provided with more than two first mounting holes. The first connecting piece is arranged on the side, away from the metal cover plate, of the first insulating piece, the electric connecting part or the first connecting piece penetrates through the first mounting hole, and the electric connecting part is connected with the first connecting piece. According to the battery pack assembly, the metal cover plate is simultaneously used as anodes or cathodes of more than two battery cells, and is directly and electrically connected with the first connecting piece, so that parts such as a pole column, an insulating sealing piece and an external busbar at the first connecting piece are omitted, the assembly procedures of the battery pack assembly are reduced, the assembly efficiency is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of power batteries and energy storage batteries, and more specifically, to a battery pack assembly, a battery, and a method for preparing the battery pack assembly. Background Art

[0002] Lithium batteries are widely used in power batteries, energy storage batteries and other technical fields. Power batteries provide power sources for tools, usually for electric vehicles, electric trains, electric bicycles, golf carts, etc., and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, etc., as well as batteries for storing energy from renewable energy. The two have different application scenarios, and their performance and design are different.

[0003] The above-mentioned battery usually includes a plurality of single cells, and a plurality of single cells are connected in series or in parallel to form a battery module. For example, a cylindrical battery uses nickel sheets or copper sheets to connect the positive and negative electrodes through laser welding to form a series / parallel structure. A square / soft-pack battery uses a metal busbar fixed by bolts or welding to form a series / parallel circuit. In the prior art, metal connecting sheets or busbars need to be welded between single cells, and the assembly process is cumbersome. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned defects of the prior art and provide a battery pack assembly, including a top cover assembly, wherein the top cover assembly includes:

[0005] A metal cover plate, wherein the metal cover plate comprises two or more electrical connection parts, each of the electrical connection parts is arranged at intervals, and the electrical connection parts are electrically connected to the metal cover plate;

[0006] A first insulating member, the first insulating member is connected to the inner surface of the metal cover plate, and the first insulating member is provided with more than two first mounting holes;

[0007] A first connecting member, wherein the first connecting member is arranged on a side of the first insulating member away from the metal cover plate, the electrical connecting portion or the first connecting member passes through the first mounting hole, and the electrical connecting portion is connected to the first connecting member.

[0008] The present invention also discloses a battery, comprising a battery casing, a battery cell and the above-mentioned battery pack assembly, wherein the battery casing and the battery pack assembly enclose a closed space, and more than two battery cells are fixed in the closed space.

[0009] The present invention also discloses a method for preparing a battery pack assembly, comprising:

[0010] Provide metal cover;

[0011] Stamp the metal cover plate to obtain two or more electrical connection parts;

[0012] Provide a first insulating part and a first connecting part. The first insulating part is provided with two or more first mounting holes;

[0013] Stack the metal cover plate, the first insulating part, and the first connecting part in sequence. The electrical connection part or the first connecting part penetrates through the first mounting hole;

[0014] Weld the first connecting part to the electrical connection part to obtain the battery pack assembly.

[0015] Implementing the embodiments of the present invention will have the following beneficial effects:

[0016] The battery pack assembly disclosed in the present invention includes a metal cover plate, a first insulating part, and a first connecting part. The metal cover plate includes two or more electrical connection parts. The electrical connection parts are arranged at intervals. The electrical connection parts are electrically connected to the metal cover plate and are connected to the first connecting part. The metal cover plate simultaneously serves as the positive electrode or the negative electrode of two or more battery cells. The metal cover plate is directly electrically connected to the first connecting part, eliminating components such as pole columns, insulating seals, and external busbars at the first connecting part, reducing the assembly process of the battery pack assembly, improving the assembly efficiency, and reducing the manufacturing cost. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Among them:

[0019] Figure 1 is a schematic diagram of a battery pack assembly provided by an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a sectional view taken along the direction of M-M' in;

[0021] Figure 3 is Figure 1 a sectional view taken along the direction of N-N' in;

[0022] Figure 4 is Figure 3 an enlarged schematic view of area A in;

[0023] Figure 5 is Figure 1 another sectional view taken along the direction of N-N' in;

[0024] Figure 6 For Figure 5 An enlarged schematic view of area B in

[0025] Figure 7 A schematic view of a battery provided by an embodiment of the present invention;

[0026] 100 - Battery pack assembly, 1 - Metal cover plate, 11 - Electrical connection part, 2 - First insulating part, 21 - Second protruding end, 3 - First connecting part, 4 - Pole block, 5 - Second insulating part, 51 - First protruding end, 6 - Second connecting part, 7 - Sealing part, 200 - Battery housing. Specific embodiments

[0027] Next, with reference to the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Refer to Figure 1 , Figure 2 , the present invention discloses a battery pack assembly 100, including a metal cover plate 1, a first insulating part 2 and a first connecting part 3.

[0029] The metal cover plate 1 includes two or more electrical connection parts 11, and the electrical connection parts 11 are arranged at intervals, and the electrical connection parts 11 are electrically connected to the metal cover plate 1.

[0030] The first insulating part 2 is connected to the inner surface of the metal cover plate 1, and the first insulating part 2 is provided with two or more first mounting holes.

[0031] The first connecting part 3 is arranged on the side of the first insulating part 2 away from the metal cover plate 1, and the electrical connection part 11 or the first connecting part 3 penetrates through the first mounting hole, and the electrical connection part 11 is connected to the first connecting part 3.

[0032] Furthermore, the electrical connection part 11 and the metal cover plate 1 are integrally formed. There is no need to separately provide a separate electrical connection component. The electrical connection part 11 and the metal cover plate 1 are integrally formed, reducing the welding steps and improving the yield of finished products.

[0033] Furthermore, with reference to Figure 2 , the metal cover plate 1 is recessed towards the first insulating part 2 to form the electrical connection part 11, and the electrical connection part 11 or the first connecting part 3 penetrates through the first mounting hole, and the electrical connection part 11 is connected to the first connecting part 3. The electrical connection part 11 is formed by the recess of the metal cover plate 1 body, which is convenient for preparation and also saves materials.

[0034] The metal cover plate 1 can also be a planar structure. The first connecting member 3 is provided with a protrusion (not shown in the figure) protruding towards the metal cover plate 1. The first connecting member 3 penetrates through the first mounting hole, so that the electrical connection portion 11 is connected to the first connecting member 3.

[0035] It should be noted that in this embodiment, the metal cover plate 1 includes more than two electrical connection portions 11. The electrical connection portions 11 are electrically connected to the first connecting member 3, so that more than two battery cells can be integrated in one battery housing. The battery pack assembly 100 is used to enclose the battery housing. The metal cover plate 1 can simultaneously serve as the positive or negative electrode of more than two battery cells, and the battery pack assembly 100 becomes an integrated battery pack assembly. Figure 1 In the figure, the metal cover plate 1 only shows four electrical connection portions 11 as an example, and is not a limitation on the quantity.

[0036] When the metal cover plate 1 is an aluminum plate, the metal cover plate 1 simultaneously serves as the positive electrode of more than two battery cells. The metal cover plate 1 is directly electrically connected to the first connecting member 3. The battery pack assembly 100 eliminates components such as the positive electrode post, the insulating seal at the positive electrode, and the external bus bar, reducing the assembly process of the battery pack assembly 100, improving the assembly efficiency, and reducing the manufacturing cost. The battery pack assembly 100 eliminates structures such as the positive electrode post, reducing the thickness of the battery pack assembly 100 and reducing the overall weight of the battery pack assembly 100; avoiding defects such as air leakage in the welding (or welding after riveting) of the positive electrode post, improving the safety and reliability of the battery. Similarly, when the metal cover plate 1 is a copper plate, the metal cover plate 1 simultaneously serves as the negative electrode of more than two battery cells.

[0037] It can be understood that in this embodiment, the process of the integrated battery pack assembly is simplified, reducing the welding process of multiple battery pack assemblies 100 respectively, reducing the preparation steps, and improving the finished product yield. When the integrated battery pack assembly is assembled with the battery housing, the space utilization rate inside the battery housing is higher, improving the battery capacity and energy density. The battery pack assembly 100 in this embodiment can be used for power batteries, energy storage batteries, electronic device batteries, etc. The electronic devices include computers, communication, and consumer electronic products.

[0038] The preparation method of the battery pack assembly 100 in this embodiment includes:

[0039] 1) Provide the metal cover plate 1.

[0040] 2) Stamp the metal cover plate 1 to obtain more than two electrical connection portions 11.

[0041] 3) Provide the first insulating member 2 and the first connecting member 3. The first insulating member 2 is provided with more than two first mounting holes.

[0042] 4) Stack the metal cover plate 1, the first insulating member 2, and the first connecting member 3 in sequence, and the electrical connection portion 11 or the first connecting member 3 penetrates through the first mounting hole.

[0043] 5) Weld the first connector 3 and the electrical connection portion 11 to obtain the battery pack assembly 100.

[0044] In this embodiment, the battery pack assembly 100 eliminates components such as the pole, insulating seal, and external bus at the first connecting member 3. The first connecting member 3 is directly electrically connected to the metal cover plate 1, which reduces the preparation steps of the battery pack assembly 100, improves assembly efficiency, and reduces manufacturing costs.

[0045] In some optional embodiments, referring to Figure 3 , Figure 4 The battery pack assembly 100 also includes a pole block 4, a second insulating member 5 and a second connecting member 6.

[0046] The pole piece 4 is arranged on the outer surface of the metal cover plate 1; the metal cover plate 1 is provided with a plurality of second mounting holes, the second mounting holes are arranged adjacent to the electrical connection portion 11, and the pole piece 4 extends into the second mounting holes.

[0047] The second insulating member 5 is disposed between the pole block 4 and the metal cover plate 1 .

[0048] The second connecting member 6 is arranged on a side of the first insulating member 2 away from the metal cover plate 1 ; the first insulating member 2 is provided with a plurality of third mounting holes, and the second connecting member 6 is connected to the pole block 4 .

[0049] Furthermore, the second insulating member 5 includes a first extending end 51 , the first extending end 51 is located in the second mounting hole, and the first extending end 51 is connected to the inner wall of the second mounting hole.

[0050] The first insulating member 2 includes a second extending end 21 . The second extending end 21 is located in the second mounting hole and connected to the inner wall of the second mounting hole. The second extending end 21 is connected to the first extending end 51 .

[0051] In this embodiment, the pole block 4, the metal cover plate 1, the second connecting member 6, and the second insulating member 5 are formed separately, and the pole block 4 is assembled to the metal cover plate 1 through the second insulating member 5. The pole block 4 and the metal cover plate 1 are bonded together through the second insulating member 5, and then the first insulating member 2 is installed. After the first insulating member 2 is assembled, the second protruding end 21 is connected to the first protruding end 51, which can play the role of a sealing ring. At the same time, the first insulating member 2 can fix the second connecting member 6 to the metal cover plate 1, which is convenient for welding the second connecting member 6 and the pole block 4, which is beneficial to conductivity.

[0052] In some alternative embodiments, when the metal cover plate 1 serves as the positive electrode, the metal cover plate 1 is an aluminum metal cover plate, and the first connecting member 3 is an aluminum connecting piece. The electrode block 4 is the negative electrode, the second connecting member 6 is a copper connecting piece, and the electrode block 4 can be a copper electrode block or a copper-aluminum composite electrode block. Preferably, the electrode block 4 is a copper-aluminum composite electrode block. The side of the electrode block 4 close to the second connecting member 6 is copper, and the side facing away from the second connecting member 6 is aluminum, which saves costs while ensuring good electrical connection between the electrode block 4 and the second connecting member 6.

[0053] Similarly, when the metal cover plate 1 serves as the negative electrode, the metal cover plate 1 is a copper metal cover plate, and the first connecting member 3 is a copper connecting piece. The electrode block 4 is the positive electrode, the second connecting member 6 is an aluminum connecting piece, and the electrode block 4 can be an aluminum electrode block, or the electrode block 4 is a copper-aluminum composite electrode block. The side of the electrode block 4 close to the second connecting member 6 is aluminum, and the side facing away from the second connecting member 6 is copper.

[0054] In some alternative embodiments, the second insulating member 5 and / or the first insulating member 2 is a polypropylene insulating member.

[0055] In this embodiment, the materials of the second insulating member 5 and / or the first insulating member 2 can be polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyamide (PA), or polyphenylene sulfide (PPS). Preferably, the second insulating member 5 and / or the first insulating member 2 is a polypropylene insulating member. The polypropylene insulating member not only plays an insulating role but also has the function of bonding the same or different metals, reducing the space utilization rate of the battery cell, thereby increasing the battery cell capacity and energy density; the polypropylene material can increase the contact area, improve the stability of electrical connection, reduce the overall thickness and weight of the battery pack assembly 100. The polypropylene insulating member combines the electrode block 4 and the metal cover plate 1, reducing the assembly cost of the metal cover plate 1 and the electrode block 4 and improving the stability between the metal cover plate 1 and the electrode block 4.

[0056] In some alternative embodiments, referring to Figure 5 、 Figure 6 , the battery pack assembly 100 further includes a seal 7, and the seal 7 is disposed between the electrode block 4 and the metal cover plate 1. In this embodiment, the seal 7 is added, and the seal 7 prevents the cover plate from being electrically connected to the electrode block 4 or the negative connecting piece, and has a better sealing effect.

[0057] Optionally, the seal 7 can be an L-shaped sealing ring. The seal 7 is located on the metal cover plate 1, and the electrode block 4 and the metal cover plate 1 cooperate to compress the seal 7, or the seal 7 is located under the metal cover plate 1, and the negative connecting piece and the metal cover plate 1 cooperate to compress the seal 7. The seal 7 can be an O-shaped sealing ring. The seal 7 is located on the inner wall of the second mounting hole of the metal cover plate 1, and the electrode block 4 and the metal cover plate 1 cooperate to compress the seal 7, and the seal 7 is compressed to meet the sealing requirements.

[0058] Referring to Figure 7, an embodiment of the present invention further provides a battery, including the battery pack assembly 100 in any one of the above embodiments.

[0059] Further, the battery further includes a battery housing 200 and battery cells (not shown in the figure). More than two battery cells are arranged in the battery housing 200. A separator is provided between adjacent battery cells. The battery pack assembly 100 is used to enclose the battery housing 200.

[0060] The battery pack assembly 100 includes a metal cover plate 1, more than two first connectors 3, and more than two second connectors 6. Each battery cell is electrically connected to a first connector 3 and a second connector 6 respectively. The metal cover plate 1 serves as the positive electrode of all battery cells and is electrically connected to the first connector 3.

[0061] It should be noted that the battery housing 200 includes a through-shell at both ends and a bottom plate. The assembly steps of the battery include: first, install the bottom plate at the bottom of the through-shell at both ends, then assemble the single battery cells into the shell. At the same time, the multiple battery cells are separated and fixed by separators. The single battery cells are welded to the first connector 3 and the second connector 6 respectively through the pole ears, then the shell is welded to the battery pack assembly together, and finally the electrolyte is injected. Figure 7 Only one battery pack assembly 100 is shown as an example in the battery, not as a limitation of the quantity. The battery may also include multiple battery pack assemblies 100.

[0062] It can be understood that multiple single battery cells are integrated in a battery housing 200 to form an integrated battery, canceling the process of separately assembling multiple components in the battery pack assembly 100. At the same time, the pole column is canceled, and the metal cover plate 1 is an integrated structure. An explosion-proof valve is provided on the battery housing 200. For example, an explosion-proof sheet is provided on each side of the battery housing 200. The metal cover plate 1 serves as the positive electrode and can be directly welded and sealed to the shell, or wrapped and sealed with the shell using a plastic insulating part, playing a role of sealing and fixing, that is, different connection methods of making the battery housing 200 and the metal cover plate 1 conductive or insulating can be achieved.

[0063] The integrated battery also cancels the bus bars between the existing battery modules and battery packs at the same time. The positive or negative electrodes of the battery cells are integrated into an integrated metal cover plate 1, reducing the assembly process of the battery pack assembly 100, improving the assembly efficiency, reducing the manufacturing cost, and improving the finished product yield. When the integrated top cover is assembled with the battery housing 200, the space utilization rate inside the battery housing 200 is higher, improving the battery capacity and energy density.

[0064] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A battery pack assembly, characterized in that, include: A metal cover plate, wherein the metal cover plate comprises two or more electrical connection parts, each of the electrical connection parts is arranged at intervals, and the electrical connection parts are electrically connected to the metal cover plate; A first insulating member, the first insulating member is connected to the inner surface of the metal cover plate, and the first insulating member is provided with more than two first mounting holes; A first connecting member, wherein the first connecting member is arranged on a side of the first insulating member away from the metal cover plate, the electrical connecting portion or the first connecting member passes through the first mounting hole, and the electrical connecting portion is connected to the first connecting member.

2. The battery pack assembly according to claim 1, wherein The electrical connection portion is integrally formed with the metal cover plate.

3. The battery pack assembly according to claim 2, wherein, The metal cover plate is recessed toward the first insulating member to form the electrical connection portion.

4. The battery pack assembly according to claim 1, wherein, Also includes: A pole block, the pole block is arranged on the outer surface of the metal cover plate; the metal cover plate is provided with a plurality of second mounting holes, the second mounting holes are arranged adjacent to the electrical connection portion, and the pole block extends into the second mounting holes; a second insulating member, the second insulating member being disposed between the pole block and the metal cover plate; A second connecting member, wherein the second connecting member is arranged on a side of the first insulating member away from the metal cover plate; the first insulating member is provided with a plurality of third mounting holes, and the second connecting member is connected to the pole block.

5. The battery pack assembly according to claim 4, wherein The second insulating member includes a first extending end, the first extending end is located in the second mounting hole, and the first extending end is connected to the inner wall of the second mounting hole; The first insulating member includes a second extending end, the second extending end is located in the second mounting hole, the second extending end is connected to the inner wall of the second mounting hole; the second extending end is connected to the first extending end.

6. The battery pack assembly according to claim 4, characterized in that, The battery pack assembly also includes a seal, which is placed between the metal cover plate and the pole block.

7. The battery pack assembly according to claim 4, characterized in that, The second insulating member and / or the first insulating member is a polypropylene insulating member.

8. The battery pack assembly according to claim 4, characterized in that, The pole block is a copper-aluminum composite pole block.

9. A battery, characterized in that, It comprises a battery casing, a battery cell and a battery pack assembly as claimed in any one of claims 1 to 8, wherein the battery casing and the battery pack assembly are enclosed to form a closed space, and more than two battery cells are fixed in the closed space.

10. A preparation method of a battery pack assembly, characterized in that include: Provide metal cover; Stamping the metal cover plate to obtain more than two electrical connection parts; Providing a first insulating member and a first connecting member, wherein the first insulating member is provided with more than two first mounting holes; The metal cover plate, the first insulating member, and the first connecting member are stacked in sequence, and the electrical connecting portion or the first connecting member passes through the first mounting hole; The first connecting member is welded to the electrical connecting portion to obtain the battery pack assembly.

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