Lithium battery shell welding structure

Abstract

The utility model belongs to the technical field of battery shell processing, and particularly relates to a lithium battery shell welding structure, which comprises a bottom shell and an upper cover, the bottom shell comprises a plurality of welding ribs which are uniformly arranged, the bottom shell is divided into a plurality of cavities by the plurality of welding ribs, the top of each welding rib is respectively provided with a convex part, and the convex parts are arranged in the cavities. A plurality of limiting clamping grooves are formed in the bottom of the upper cover, a flash groove is formed between each limiting clamping groove and the corresponding protruding part, and the upper cover and the protruding parts form a welding part through synchronous laser welding; the volume of the flash groove is greater than that of the welding part; according to the utility model, the upper cover is provided with a plurality of limiting clamping grooves which are integrally formed, the structural design of clamping and matching with the welding ribs is optimized, the volume of the flash groove is accurately controlled, the stable quality of the welding part is ensured, the flash after welding can be effectively reduced, the welding strength is ensured, and the sealing performance and the yield of the whole structure are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery shell processing technical field, concretely relates to a lithium battery shell welding structure. BACKGROUND

[0002] The lithium battery shell is mainly divided into metal shell and plastic shell, the plastic shell has more lightweight design and cost benefit compared with the metal shell, and some materials in the plastic have chemical corrosion resistance and good mechanical properties and thermal stability, so that the lithium battery has better service life and higher safety.

[0003] As shown in Figures 7 to 8 The plastic shell lithium battery in the prior art generally adopts ultrasonic welding, due to the product size limitation when adopting ultrasonic welding, only multiple upper shells 51 can be welded with the welding sites 521 of the lower shells 52 in turn, due to the deformation of the two adjacent upper shells 51 after welding, the stacking causes the rear shell body to be unable to be installed, which further leads to the position deviation of the battery shell affected by vibration, and the post-welding overflow is more, which affects the appearance. If the ultrasonic welding is replaced by a laser welding structure, a quasi-synchronous welding method is adopted, the same situation exists; if the cover body is combined and welded at the same time, the risk of cover body leakage after welding is easy to cause, the yield is low, and mass production cannot be realized.

[0004] Based on this, it is necessary to improve the defects existing in the prior art to overcome the deficiencies in actual application. UTILITY MODEL CONTENTS

[0005] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the utility model is to at least solve one or more of the above-mentioned problems existing in the prior art, in other words, one of the purposes of the utility model is to provide a lithium battery shell welding structure which satisfies one or more of the above-mentioned needs.

[0006] In order to achieve the above-mentioned utility model purposes, the utility model adopts the following technical scheme:

[0007] The utility model provides a lithium battery shell welding structure, including bottom shell and upper cover, the bottom shell includes evenly arranged several welding ribs, the bottom shell is set as several cavities through several welding ribs, the top of each welding rib is respectively equipped with the protruding part, the bottom of upper cover is equipped with several limit clamping grooves, each limit clamping groove forms overflow groove with corresponding protruding part respectively, the upper cover and protruding part form the fusion part through synchronous laser welding, wherein the volume of overflow groove is greater than the volume of fusion part.

[0008] As a preferred solution, the overflow groove comprises a first overflow groove and a second overflow groove, and the first overflow groove and the second overflow groove are respectively arranged on two sides of the protruding part.

[0009] As a preferred solution, the sum of the volumes of the first overflow groove and the second overflow groove is greater than the volume of the fusion part.

[0010] As a preferred solution, the limiting clamping groove is in clamping cooperation with the welding rib, and the width of the limiting clamping groove is greater than the width of the welding rib.

[0011] As a preferred solution, the width of the protruding part is less than the width of the limiting clamping groove.

[0012] As a preferred solution, the limiting clamping groove comprises a first clamping edge and a second clamping edge, and the first clamping edge, the second clamping edge and the protruding part form a first overflow groove and a second overflow groove.

[0013] As a preferred solution, the bottom of the upper cover is provided with a mounting groove, the top of the bottom shell is provided with a supporting part, and the mounting groove is in clamping cooperation with the supporting part.

[0014] As a preferred solution, the upper cover is configured as a light-transmitting layer, and the welding rib is configured as a light-absorbing layer.

[0015] Compared with the prior art, the present application has the beneficial effects that:

[0016] The present application provides a lithium battery shell welding structure, by configuring a plurality of integrally formed limiting clamping grooves on the upper cover, optimizing the structure design of the clamping cooperation with the welding rib, accurately controlling the volume of the overflow groove, ensuring the quality stability of the fusion part, effectively reducing the post-welding overflow, ensuring the welding strength, reducing the leakage risk, improving the overall structure sealing performance and yield, thereby greatly improving the production efficiency and product reliability, meeting the high standard requirements of the high-end market for lithium battery shells. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain the drawings of other embodiments according to these drawings without creating any creative labor.

[0018] Figure 1 is a schematic view of a lithium battery shell welding structure of an embodiment of the present application;

[0019] Figure 2 is a structural schematic view of the upper cover and the shell of an embodiment of the present application;

[0020] Figure 3 is a structural schematic view of the upper cover of the embodiment of the utility model;

[0021] Figure 4 is a side view of the lithium battery shell welding structure of the embodiment of the utility model;

[0022] Figure 5 is Figure 4 the sectional view of B-B in it;

[0023] Figure 6 is Figure 5 the partial enlarged view of the cooperation relationship between the welding rib and the limiting clamping groove in it;

[0024] Figure 7 is the battery shell welding structure schematic view in the prior art;

[0025] Figure 8 is Figure 7 the partial enlarged view of the welding position in it;

[0026] In the drawing: 1 upper cover, 11 limiting clamping groove, 12 mounting groove, 2 bottom shell, 21 welding rib, 22 protruding part, 23 supporting part, 31 first overflow groove, 32 second overflow groove, 4 fusion part, 51 upper shell, 52 lower shell, 521 welding position. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present application, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings and other embodiments according to these drawings without creating laborious work.

[0028] In the description of the embodiments of the present application, the terms "upper", "lower", "front", "rear" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only used to distinguish in the description, and have no special meaning.

[0029] According to some embodiments of the present application, as Figures 1 to 6As shown, a lithium battery shell welding structure is provided, including a bottom shell 2 and an upper cover 1, the bottom shell 2 includes a plurality of welding ribs 21 arranged uniformly, the bottom shell 2 is provided with a plurality of cavities through the plurality of welding ribs 21, the top of each welding rib 21 is respectively provided with a protruding part 22, the bottom of the upper cover 1 is provided with a plurality of limiting clamping grooves 11, each limiting clamping groove 11 forms a flash groove with the corresponding protruding part 22, the upper cover 1 and the protruding part 22 form a fusion part 4 through synchronous laser welding; wherein the volume of the flash groove is greater than the volume of the fusion part 4, which can ensure that the excess molten material in the welding process can be effectively discharged, avoiding the generation of bubbles or inclusions in the fusion part, further improving the welding strength and sealing performance. By precisely controlling the matching relationship between the welding rib and the limiting clamping groove, the volume of the flash groove is accurately controlled, so that the quality of the fusion part is more stable and reliable. The structure design simplifies the assembly process, reduces the production cost, and improves the production efficiency.

[0030] Specifically, the flash groove includes a first flash groove 31 and a second flash groove 32, which are respectively arranged on both sides of the protruding part 22, for accommodating the excess molten material generated in the welding process, ensuring the welding precision and structural stability. By optimizing the design of the flash groove, the molten material is effectively prevented from overflowing, the welding quality is improved, the strength of the fusion part is high, the overall sealing performance of the battery shell is ensured, and the service life is prolonged.

[0031] In some embodiments of the present application, the sum of the volumes of the first flash groove 31 and the second flash groove 32 is greater than the volume of the fusion part 4, which not only ensures that the excess material in the welding process has enough space to discharge, but also further enhances the welding strength and sealing performance, thereby improving the overall performance and durability of the lithium battery shell.

[0032] In some embodiments of the present application, the limiting clamping groove 11 and the welding rib 21 are in clamping cooperation, and the width of the limiting clamping groove 11 is greater than the width of the welding rib 21. Through such clamping cooperation, the fixing of the upper cover 1 and the bottom shell 2 is more firm, effectively preventing displacement during the welding process, ensuring the welding precision and structural stability.

[0033] In some embodiments of the present application, the width of the protruding part 22 is less than the width of the limiting clamping groove 11, which can effectively collect the excess molten material generated in the welding process in the flash groove, avoiding the overflow of the molten material and ensuring the welding quality and the sealing performance of the shell. At the same time, the precise cooperation of the limiting clamping groove and the welding rib further improves the stability and durability of the overall structure. In addition, this structure also optimizes the welding process, reduces the production cost, and improves the production efficiency.

[0034] In some embodiments of the present application, the limiting slot 11 includes a first clamping edge and a second clamping edge, and the first clamping edge and the second clamping edge form a first overflow slot and a second overflow slot with the protruding part. The length of the first clamping edge and the second clamping edge is slightly longer than the protruding part, which ensures that the capacity of the overflow slot is sufficient, not only guarantees the structural strength, but also avoids excessive material consumption.

[0035] In some embodiments of the present application, the bottom of the upper cover 1 is provided with a mounting groove 12, and the top of the bottom shell 2 is provided with a supporting part 23. The mounting groove 12 and the supporting part 23 are connected and matched to form a firm connection, which ensures that the upper cover 1 and the bottom shell 2 are tightly combined and prevent loosening, avoids displacement and deformation during the welding process, further enhances the stability and sealing performance of the overall structure, and improves the service life and safety of the lithium battery shell.

[0036] In some embodiments of the present application, the upper cover 1 is configured as a light-transmitting layer, and the welding rib 21 is configured as a light-absorbing layer. The light-transmitting layer and the light-absorbing layer are combined to improve the welding precision and strength, and ensure the sealing performance of the lithium battery shell. The light-transmitting layer is made of high-transmittance material, and the light-absorbing layer is made of high-efficiency light-absorbing material. The two work together to effectively improve the energy utilization rate of laser welding, reduce energy consumption, and prolong the service life of the equipment.

[0037] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] The above only describes the preferred embodiments and principles of the present application in detail. For those skilled in the art, according to the idea provided by the present application, the specific implementation manner will be changed, and these changes should be regarded as the protection scope of the present application.

Claims

1. A lithium battery case welding structure, characterized by, The application relates to a bottom shell and an upper cover, the bottom shell comprises a plurality of welding ribs arranged uniformly, the bottom shell is provided with a plurality of cavities through the plurality of welding ribs, the top of each welding rib is provided with a protruding part, the bottom of the upper cover is provided with a plurality of limiting clamping grooves, each limiting clamping groove and the corresponding protruding part form an overflow groove, the upper cover and the protruding part are connected through synchronous laser welding to form a fusion part, and the volume of the overflow groove is larger than that of the fusion part.

2. The lithium battery case welding structure according to claim 1, wherein The overflow groove comprises a first overflow groove and a second overflow groove, and the first overflow groove and the second overflow groove are arranged on the two sides of the protruding part respectively.

3. The lithium battery case welding structure according to claim 2, wherein The sum of the volumes of the first overflow groove and the second overflow groove is larger than that of the fusion part.

4. The lithium battery case welding structure according to claim 1, wherein The limiting clamping groove and the welding rib are clamped and matched, and the width of the limiting clamping groove is larger than that of the welding rib.

5. The lithium battery case welding structure according to claim 1, wherein The width of the protruding part is smaller than that of the limiting clamping groove.

6. The lithium battery case welding structure according to claim 1, wherein The limiting clamping groove comprises a first clamping edge and a second clamping edge, and the first clamping edge, the second clamping edge and the protruding part form the first overflow groove and the second overflow groove.

7. The lithium battery case welding structure according to claim 1, wherein The bottom of the upper cover is provided with a mounting groove, the top of the bottom shell is provided with a supporting part, and the mounting groove and the supporting part are clamped and matched.

8. The lithium battery case welding structure according to claim 1, wherein The upper cover is configured as a light-transmitting layer, and the welding rib is configured as a light-absorbing layer.

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