Lightweight soft package battery

Abstract

The utility model discloses a light-weight soft package battery, which comprises a shell and a battery module, wherein an accommodating cavity is formed in the shell; the battery module is arranged in the accommodating cavity, the battery module comprises a battery assembly, the battery assembly comprises a plurality of single batteries which are sequentially connected in series, each single battery comprises a positive pole lug, a negative pole lug and a top sealing edge, and the positive pole lugs and the negative pole lugs of two adjacent single batteries are welded to form a composite pole lug; the composite tab is arranged between the adjacent top sealing edges, a first supporting block is arranged between the adjacent top sealing edges, the first supporting block is arranged below the composite tab, the first supporting block is used for preventing the top sealing edges from deforming, the first supporting block adopts an EVA foam block, and the EVA foam block has the characteristics of low density and light weight; and the light weight of the soft package battery is not influenced while the deformation of the composite tab is prevented, so that the use of a connecting sheet or a converging sheet made of metal in the soft package battery is avoided, and the weight of the soft package battery is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of lightweight soft package battery. BACKGROUND

[0002] Soft package battery, also known as polymer lithium ion battery or aluminum-plastic film battery, is a battery composed of multiple layers of flexible composite polymer film, with characteristics of flexible design, high energy density, high safety, etc., and is widely used in intelligent devices, electric transportation and other fields.

[0003] Currently, in the lithium battery industry, the tab series-parallel connection of soft package battery generally adopts tin soldering and laser welding methods. Tin soldering process requires the addition of connecting pieces during welding, and laser welding process requires the addition of bus bars during welding. The connecting pieces and bus bars play a role in fixing the composite tabs and prevent the composite tabs from deforming to ensure the structural stability of the soft package battery. However, the connecting pieces and bus bars are usually made of metal, which makes the battery heavier and makes it difficult to achieve lightweight soft package battery. SUMMARY

[0004] The utility model aims at overcoming the shortcomings of the prior art and providing a lightweight soft package battery.

[0005] The utility model aims to achieve the following technical solutions:

[0006] A lightweight soft package battery includes a housing and a battery module. The housing is provided with a receiving cavity. The battery module is arranged in the receiving cavity. The battery module includes a battery assembly, which includes multiple single batteries arranged in series. The single battery includes a positive tab, a negative tab, and a top sealing edge. The positive tab and the negative tab of adjacent single batteries are welded to form a composite tab. The composite tab is arranged between adjacent top sealing edges. A first support block is arranged between the adjacent top sealing edges. The first support block is arranged below the composite tab and prevents the top sealing edge from deforming.

[0007] In one embodiment, the composite tab includes a welding portion, and the positive tab and the negative tab are electrically connected by the welding portion.

[0008] In one embodiment, the single battery further includes a side sealing edge, which is arranged perpendicularly to the top sealing edge.

[0009] In one embodiment, the battery module includes a first buffer piece, a second buffer piece, and a third buffer piece. The first and second buffer pieces are arranged on both sides of the battery assembly, and the third buffer piece is arranged at the bottom of the battery assembly.

[0010] In one of the embodiments, second supporting blocks are arranged above the first buffer sheet and the second buffer sheet.

[0011] In one of the embodiments, the battery module further comprises a first insulating sheet and a second insulating sheet, the first insulating sheet is arranged on the side of the first buffer sheet away from the battery assembly, and the second insulating sheet is arranged on the side of the second buffer sheet away from the battery assembly.

[0012] In one of the embodiments, a top cover is further arranged above the battery module, and first accommodating grooves and second accommodating grooves are arranged on the top cover.

[0013] In one of the embodiments, the first accommodating grooves are provided with a plurality of first clamping portions, and the second accommodating grooves are provided with a plurality of second clamping portions.

[0014] In one of the embodiments, a wire outlet is arranged on the top cover, and a first cable and a second cable are arranged through the wire outlet, and the first cable and the second cable are electrically connected with the battery module respectively.

[0015] In one of the embodiments, a wire protection ring is arranged on the wire outlet, and the wire protection ring is arranged around the first cable and the second cable.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] The utility model discloses a lightweight soft package battery, which connects the positive or negative tab of one single battery with the negative or positive tab of the adjacent single battery to form a composite tab by ultrasonic welding, in order to reduce the weight of the soft package battery, no connecting piece or bus bar is arranged for fixing the composite tab in the process of ultrasonic welding, and the top sealing edge structure is relatively soft and is easy to be extruded and deformed, which causes the composite tab to be easy to be deformed, therefore, the first supporting block is arranged between the adjacent top sealing edges, so that the top sealing edge is not easy to be extruded and deformed, and the deformation of the composite tab is prevented, the first supporting block is made of EVA foam block, the EVA foam block has the characteristics of low density and light weight, and prevents the deformation of the composite tab without affecting the lightweight of the soft package battery, so that the connecting piece or bus bar made of metal is avoided in the soft package battery, and the weight of the soft package battery is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced.

[0019] Figure 1A structure schematic view of a soft package battery in one embodiment of the utility model;

[0020] Figure 2 For Figure 1 A structure schematic view of a battery assembly in one embodiment of the utility model;

[0021] Figure 3 For Figure 2 A structure schematic view of a single battery in one embodiment of the utility model.

[0022] BRIEF DESCRIPTION OF DRAWINGS: 10, soft package battery;100, shell;110, accommodating cavity;200, battery module;210, battery assembly;211, single battery;211a, positive tab;211b, negative tab;211c, top sealing edge;212, composite tab;213, first support block;212a, welding portion;211d, side sealing edge;220, first buffer sheet;230, second buffer sheet;240, third buffer sheet;250, second support block;260, first insulating sheet;270, second insulating sheet;300, top cover;310, first accommodating groove;320, second accommodating groove;311, first clamping portion;321, second clamping portion;330, wire outlet;340, first cable;350, second cable;360, wire protection ring; DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the utility model, the utility model will be described more comprehensively below with reference to relevant drawings.

[0024] Please refer to Figures 1 to 3 A soft package battery 10, including: shell 100 and battery module 200, the shell 100 is provided with accommodating cavity 110;Battery module 200 is set in accommodating cavity 110, and battery module 200 includes battery assembly 210, and battery assembly 210 includes multiple single batteries 211 that are sequentially connected in series, and single battery 211 includes positive tab 211a, negative tab 211b and top sealing edge 211c, and the positive tab 211a and the negative tab 211b of adjacent two single batteries 211 are formed composite tab 212 by welding, and composite tab 212 is set between adjacent top sealing edge 211c, and first support block 213 is set between adjacent top sealing edge 211c, and first support block 213 is set below composite tab 212, and first support block 213 is used for preventing top sealing edge 211c from deforming.

[0025] It should be noted that the positive tab 211a and the negative tab 211b are wrapped in the top sealing edge 211c after being led out from the inside of the single battery 211, which can improve the sealing and stability of the positive tab 211a and the negative tab 211b. The positive tab 211a or the negative tab 211b of one single battery 211 is connected in series with the negative tab 211b or the positive tab 211a of the adjacent other single battery 211 by ultrasonic welding to form a composite tab 212. In the welding process, in order to avoid short circuit of the battery module 200, the two positive tabs 211a and the two negative tabs 211b of the adjacent two single batteries 211 cannot be welded. In order to reduce the weight of the soft package battery 10, no connecting sheet or busbar is provided for supporting the composite tab 212 during ultrasonic welding. However, in the case where no connecting sheet or busbar is provided, the top sealing edge 211c is easily deformed by extrusion due to its soft structure, which causes the composite tab 212 to be easily deformed. Therefore, the first supporting block 213 is arranged between the adjacent top sealing edges 211c, so that the top sealing edge 211c is not easily deformed by extrusion, preventing the deformation of the composite tab 212. The first supporting block 213 is made of EVA foam block, which has the characteristics of low density and light weight, and can support the soft package battery 10 while not affecting the lightweight of the soft package battery 10, thereby avoiding the use of metal connecting sheet or busbar in the soft package battery 10, and reducing the weight of the soft package battery 10.

[0026] Please refer to Figure 2 and Figure 3 In an embodiment, the composite tab 212 includes a welding portion 212a, and the positive tab 211a and the negative tab 211b are electrically connected through the welding portion 212a to realize the electrical connection of each single battery 211. After the welding of the positive tab 211a and the negative tab 211b is completed, the extended part of the welding portion 212a needs to be cut, so that the occupied space of the battery module 200 is reduced, and the weight of the battery module 200 is reduced, which is convenient for subsequent manual installation of the battery module 200, and further lightens the soft package battery 10.

[0027] Please refer to Figure 2In an embodiment, the single battery 211 further comprises a side sealing edge 211d, which is arranged perpendicularly to the top sealing edge 211c. After the positive and negative tabs 211a and 211b are welded to form the composite tab 212, the first supporting block 213 is placed between the top sealing edges 211c of the adjacent single batteries 211. When the battery module 200 is placed in the shell 100, the side sealing edge 211d is arranged by being bent. The bending direction of the adjacent side sealing edges 211d can be towards each other, in the same direction, or in opposite directions. Therefore, the bending direction of the side sealing edge 211d is not fixed. The side sealing edge 211d only needs to be arranged perpendicularly to the top sealing edge 211c to reduce the occupied space of the battery module 200 and facilitate the installation of the battery module 200.

[0028] Please refer again to Figure 1 In an embodiment, the battery module 200 comprises a first buffer sheet 220, a second buffer sheet 230, and a third buffer sheet 240. The first buffer sheet 220 and the second buffer sheet 230 are arranged on the two sides of the battery assembly 210, and the third buffer sheet 240 is arranged at the bottom of the battery assembly 210. The first buffer sheet 220, the second buffer sheet 230, and the third buffer sheet 240 can effectively reduce the damage of external impact to the soft package battery 10, avoid the bumping and vibration in complex road conditions, and cause the structure of the soft package battery 10 to be loose or damaged, thereby prolonging the service life of the soft package battery 10.

[0029] Please refer again to Figure 1 In an embodiment, the upper side of the first buffer sheet 220 and the upper side of the second buffer sheet 230 are respectively provided with a second supporting block 250. The second supporting block 250 is an EVA foam block, which can also have a buffering effect, better absorb and disperse external impact force, and make the structure of the battery assembly 210 more stable. When the first buffer sheet 220 and the second buffer sheet 230 are impacted, the second supporting block 250 can avoid the local extrusion to the position of the top sealing edge 211c and cause the composite tab 212 to be loose.

[0030] Please refer again to Figure 1 In an embodiment, the battery module 200 further comprises a first insulating sheet 260 and a second insulating sheet 270. The first insulating sheet 260 is arranged on the side of the first buffer sheet 220 away from the battery assembly 210, and the second insulating sheet 270 is arranged on the side of the second buffer sheet 230 away from the battery assembly 210. The first insulating sheet 260 and the second insulating sheet 270 can provide insulation protection for the battery assembly 210, thereby ensuring the safety of the soft package battery 10, prolonging the service life of the soft package battery 10, and optimizing the performance of the soft package battery 10.

[0031] Please refer again to Figure 1In an embodiment, the top cover 300 is arranged above the battery module 200, the first accommodating groove 310 and the second accommodating groove 320 are arranged on the top cover 300, the sealing ring is arranged on the first accommodating groove 310 and the second accommodating groove 320, the sealing ring is used for protecting the inside and outside of the soft package battery 10, preventing the soft package battery 10 from leaking liquid or gas, avoiding problems such as leakage and short circuit in the soft package battery 10, and preventing impurities such as dust and water vapor from entering the inside of the soft package battery 10, so that the soft package battery 10 can maintain a good working state.

[0032] Please refer again to Figure 1 In an embodiment, the first accommodating groove 310 is provided with a plurality of first clamping portions 311, and the second accommodating groove 320 is provided with a plurality of second clamping portions 321, the first clamping portions 311 and the second clamping portions 321 can be used to fix the sealing ring on the first accommodating groove 310 and the second accommodating groove 320 more firmly, and prevent the sealing ring from slipping off and losing the protection effect.

[0033] Please refer again to Figure 1 In an embodiment, the top cover 300 is arranged above the battery module 200, the first accommodating groove 310 and the second accommodating groove 320 are arranged on the top cover 300, the sealing ring is arranged on the first accommodating groove 310 and the second accommodating groove 320, the sealing ring is used for protecting the inside and outside of the soft package battery 10, preventing the soft package battery 10 from leaking liquid or gas, avoiding problems such as leakage and short circuit in the soft package battery 10, and preventing impurities such as dust and water vapor from entering the inside of the soft package battery 10, so that the soft package battery 10 can maintain a good working state.

[0034] Please refer again to Figure 1 In an embodiment, the top cover 300 is arranged above the battery module 200, the first accommodating groove 310 and the second accommodating groove 320 are arranged on the top cover 300, the sealing ring is arranged on the first accommodating groove 310 and the second accommodating groove 320, the sealing ring is used for protecting the inside and outside of the soft package battery 10, preventing the soft package battery 10 from leaking liquid or gas, avoiding problems such as leakage and short circuit in the soft package battery 10, and preventing impurities such as dust and water vapor from entering the inside of the soft package battery 10, so that the soft package battery 10 can maintain a good working state.

[0035] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A lightweight pouch battery, characterized by comprising: The utility model relates to a battery module and a battery pack comprising the same. The battery module comprises a battery assembly comprising a plurality of single batteries arranged in series, each single battery comprising a positive tab, a negative tab and a top sealing edge, the positive tab and the negative tab of adjacent single batteries being welded to form a composite tab, the composite tab being arranged between adjacent top sealing edges, a first support block being arranged between the adjacent top sealing edges and below the composite tab, the first support block preventing deformation of the top sealing edge. The composite tab comprises a welding portion, and the positive tab and the negative tab are electrically connected by the welding portion. 2.The soft-pack battery of claim 1, wherein The single battery further comprises a side sealing edge arranged perpendicularly to the top sealing edge. 3.The lightweight soft-pack battery of claim 1, wherein The battery module comprises a first buffer sheet, a second buffer sheet and a third buffer sheet, the first buffer sheet and the second buffer sheet being arranged on both sides of the battery assembly respectively, and the third buffer sheet being arranged at the bottom of the battery assembly. 4.The soft-packaged battery of claim 1, wherein A second support block is arranged above the first buffer sheet and the second buffer sheet respectively. 5.The lightweight soft-pack battery of claim 4, wherein The battery module further comprises a first insulating sheet and a second insulating sheet, the first insulating sheet being arranged on the side of the first buffer sheet away from the battery assembly, and the second insulating sheet being arranged on the side of the second buffer sheet away from the battery assembly. 6.The soft-packaged battery of claim 4, wherein The utility model further comprises a top cover arranged above the battery module, the top cover being provided with a first accommodating groove and a second accommodating groove. 7.The soft-packaged battery of claim 1, wherein The first accommodating groove is provided with a plurality of first clamping portions, and the second accommodating groove is provided with a plurality of second clamping portions. 8.The soft-pack battery of claim 7, wherein The top cover is provided with a wire outlet, the first cable and the second cable are arranged in the wire outlet, and the first cable and the second cable are electrically connected to the battery module respectively. 9.The soft-packaged battery of claim 7, wherein The wire outlet is provided with a wire protection ring, and the wire protection ring surrounds the first cable and the second cable. 10.The soft-pack battery of claim 9, wherein ​

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