Tab connection structure of high-capacity soft package battery cell

Abstract

The utility model relates to the technical field of battery cells, and discloses a tab connecting structure of a high-capacity soft package battery cell, which comprises a plurality of battery cell bodies, the plurality of battery cell bodies are sequentially stacked and distributed, one side of each battery cell body is provided with a positive tab and a negative tab, and the positive tabs and the negative tabs of the plurality of battery cell bodies are sequentially distributed at intervals along the stacking direction; conductive plates for supporting the corresponding positive tabs or negative tabs are arranged between the positive tabs or the negative tabs on the same side of the plurality of battery cell bodies; the upper surface and the lower surface of the current-conducting plate are respectively provided with a tab pressing plate, a fixing space for inserting a tab is arranged between each tab pressing plate and the upper surface or the lower surface of the current-conducting plate, and the tab pressing plates are fixed on the current-conducting plate and are locked with the tabs into a whole through the fixing spaces. The utility model has the beneficial effects of simple structure and stable tab connection.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, and in particular to a pole ear connection structure of a large-capacity soft-pack battery cell. Background Art

[0002] With the development of technology and the increasing demand for mobile devices, vehicles and energy storage devices, the demand for batteries as energy sources has also increased rapidly. At the same time, with the continuous development and application of renewable energy, new energy batteries have become an extremely important part of life, and their application scope is becoming more and more extensive. Among them, the tab is a structure that connects to the outside world for charging and discharging operations. The battery cell usually needs to be connected to the tab to ensure the normal use of the battery cell.

[0003] For example, the patent document with publication number CN116565464A discloses a connection structure of a battery pole ear and a battery, the connection structure includes: a first connecting arm; a second connecting arm; a connecting piece, which is arranged at a position where the first connecting arm matches the limiting hole, and the connecting piece is sequentially passed through the first pole ear, the second pole ear and the limiting hole along the first direction; the connecting piece includes a limiting portion opposite to the second connecting arm along the first direction; a fastener, which is detachably abutted between the limiting portion and the second connecting arm. The above technical solution solves the problems of poor stability, electrochemical corrosion and weak current capacity caused by the welding process required between pole ears of different materials.

[0004] The above technical solution realizes stable connection of the battery cell tab and improves the current carrying capacity of the tab by detachably connecting the tab to the battery cell. However, in response to the market demand for low cost, large capacity, light weight, high safety performance and convenient recycling of batteries, soft-pack large cells have become the general trend. As the capacity of soft-pack batteries gradually increases, the size of large-capacity soft-pack batteries and the size of the tab increase accordingly. Due to the increase in the size of the tab, the weight of the tab itself also increases significantly, which increases the pressure on the connection between the tab and the battery cell. As a result, the tab is prone to structural fatigue under the action of pressure during use, resulting in damage to the tab, and the safe and stable operation of the tab cannot be guaranteed, resulting in reduced safety of the battery cell. Utility Model Content

[0005] The utility model aims to provide a tab connection structure for a large-capacity soft-pack battery cell, so as to solve the technical problem in the prior art that the tabs of the large-capacity soft-pack battery cell are easily damaged and the safe and stable operation of the tabs cannot be guaranteed.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a pole ear connection structure for a large-capacity soft-pack battery cell, comprising a plurality of battery cell bodies, the plurality of battery cell bodies are stacked in sequence, a positive pole ear and a negative pole ear are provided on one side of the battery cell body, and the positive pole ears and negative pole ears of the plurality of battery cell bodies are spaced in sequence along the stacking direction; a conductive block for supporting the corresponding positive pole ear or negative pole ear is provided between the positive pole ears or negative pole ears on the same side of the plurality of battery cell bodies; pole ear pressing plates are provided on the upper and lower surfaces of the conductive blocks, and a fixed space for inserting the pole ear is provided between each pole ear pressing plate and the upper or lower surface of the conductive block, and the pole ear pressing plate is fixed on the conductive block and locked with the pole ear through the fixed space to form a whole.

[0007] The principle and advantage of this scheme are: when assembling the soft-pack battery cells, the battery cell bodies are stacked so that the positive and negative ears on the battery cell bodies are distributed correspondingly along the stacking direction, and the conductive blocks are placed between the positive ears or negative ears so that the positive ears and negative ears are laid on the conductive blocks, so that the positive ears and negative ears can be supported and protected by the conductive blocks; the ear pressing plates are installed on both sides of the conductive blocks where the positive ears or negative ears are laid, so that the positive ears and negative ears are fixed under the clamping of the conductive blocks and the ear pressing plates. In this scheme, a battery cell bracket is arranged between the battery cell ears, so that the positive ears and negative ears of multiple battery cell bodies can be stably connected on the battery cell bracket, and at the same time, the positive ears and negative ears are supported by the conductive blocks, so that the pressure on the positive ears and negative ears can be dispersed through the conductive blocks, so as to avoid the conductive blocks from being damaged during use, affecting the safety of the ears and the battery cell as a whole, and at the same time improving the neatness of the connection between multiple positive ears and negative ears.

[0008] Preferably, as an improvement, the conductive block is embedded between two adjacent positive or negative tabs, so that the conductive block can better support and protect the positive and negative tabs, and avoid bending of the positive and negative tabs, which may damage the positive or negative tabs.

[0009] Preferably, as an improvement, a strip groove is provided at corresponding positions of the conductive block and the tab pressure plate, and two ends of the strip groove pass through two ends of the conductive block.

[0010] Preferably, as an improvement, a pressing plate protrusion is provided at the corresponding position of the tab pressing plate and the strip groove, and the shape of the pressing plate protrusion matches the shape of the strip groove, so that the tab and the conductive block can be connected more stably, and the tab is prevented from slipping off the tab pressing plate during use, thereby ensuring the stability of the installation of the positive tab or the negative tab.

[0011] Preferably, as an improvement, the strip groove is an arc groove, so that the positive electrode ear and the negative electrode ear can be bent in an arc shape when being fixed in the strip groove, thereby avoiding large-angle bending of the positive electrode ear and the negative electrode ear during fixing, resulting in breakage and damage.

[0012] Preferably, as an improvement, a plurality of fixing holes are opened at the bottom of the strip-shaped groove, the plurality of fixing holes are evenly distributed along the extension direction of the strip-shaped groove, and the fixing holes penetrate through both sides of the conductive block.

[0013] Preferably, as an improvement, a plurality of connection holes are provided on the tab pressing plate, the connection holes are distributed correspondingly to the fixing holes, and the connection holes penetrate both sides of the tab pressing plate. Bolts are provided in the connection holes and the fixing holes, and the bolts are used to fix the tab pressing plate and the conductive block. Fixing the tab pressing plate and the conductive block by bolts can clamp the tab, ensure that each structure can be stably connected, and facilitate disassembly and maintenance of each battery cell body.

[0014] Preferably, as an improvement, the side of the connection hole away from the conductive block matches the shape of the bolt head, and the depth of the connection hole is not less than the thickness of the bolt head. This ensures that after the conductive block and the tab pressure plate are fixed by bolts, the top of the bolt does not protrude from the surface of the tab pressure plate, thus avoiding the potential safety hazard of the battery cell caused by the protrusion of the bolt on the top of the tab pressure plate.

[0015] Preferably, as an improvement, the tab pressing plate is made of insulating material, so that when the tab pressing plate is used to fix the tab, the tab pressing plate is prevented from being electrically connected to the outside world, so as to prevent the battery body from being short-circuited during use, thereby ensuring the safety of the battery when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the tab connection structure of a large-capacity soft-pack battery cell in an embodiment of the utility model.

[0017] Figure 2 It is a schematic cross-sectional structure diagram of the tab connection structure of a large-capacity soft-pack battery cell in an embodiment of the utility model.

[0018] Figure 3 It is a schematic diagram of the conductive block structure in an embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the structure of the tab pressure plate in the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The reference numerals in the drawings of the specification include: battery cell body 1 , positive electrode tab 101 , negative electrode tab 102 , conductive block 2 , strip groove 201 , fixing hole 202 , tab pressing plate 3 , pressing plate protrusion 301 , connecting hole 302 , bolt 4 .

[0022] As attached Figure 1 With attached Figure 2 As shown, a tab connection structure of a large-capacity soft-pack battery cell includes a battery cell body 1 and a conductive block 2. The conductive block 2 is located on one side of the battery cell body 1 where a positive tab 101 and a negative tab 102 are provided. The conductive block 2 is located on one side of the positive tab 101 and the negative tab 102 and is used to support the positive tab 101 or the negative tab 102.

[0023] The battery cell body 1 includes two pieces, and the two battery cell bodies 1 are stacked in sequence along the height direction, and the positive electrode ears 101 and the negative electrode ears 102 of the two battery cell bodies 1 are correspondingly distributed along the height direction on one side. The specific connection structure between the battery cell and the positive electrode ears 101 and the negative electrode ears 102 is the prior art and will not be described in detail here.

[0024] There is a gap between the positive tabs 101 or negative tabs 102 of the two battery cell bodies 1, and the conductive block 2 is located between the two adjacent positive tabs 101 or negative tabs 102, and the conductive block 2 is embedded between the two positive tabs 101 or negative tabs 102. Preferably, in this embodiment, the thickness of the conductive block matches the gap between the two positive tabs 101 or negative tabs 102. Figure 3 As shown, a strip groove 201 is provided at the corresponding position of the conductive block 2 and the positive electrode ear 101 or the negative electrode ear 102. Specifically, the strip groove 201 is located on the surface of the top and bottom of the conductive block 2. The two ends of the strip groove 201 extend toward the two ends of the conductive block 2 along the width direction A of the conductive block 2, and the two ends of the strip groove 201 penetrate the two ends of the conductive block 2. The positive electrode ear 101 and the negative electrode ear 102 between the battery body 1 can be supported by the conductive block 2, ensuring that the positive electrode ear 101 and the negative electrode ear 102 can have good force support, simplifying the support structure of the positive electrode ear 101 and the negative electrode ear 102, and avoiding the complexity of the support mechanism of the positive electrode ear 101 and the negative electrode ear 102, which leads to an increase in the volume of the battery.

[0025] The strip grooves 201 are arc-shaped grooves, and a tab pressing plate 3 is provided on each strip groove 201. The tab pressing plate 3 and the conductive block 2 are stacked in the height direction. There is a fixed space for the positive tab 101 or the negative tab 102 to be inserted between each tab pressing plate 3 and the upper surface or the lower surface of the conductive block 2, so that the tab pressing plate 101 is fixed on the conductive block 2 and is locked with the positive tab 101 or the negative tab 102 through the fixed space to form a whole; as shown in the attached Figure 4As shown, a pressing plate protrusion 301 is provided at the corresponding position of the tab pressing plate 3 and the arc groove, and the shape of the pressing plate protrusion 301 matches the shape of the strip groove 201. A plurality of fixing holes 202 are provided at the bottom of the strip groove 201, and the fixing holes 202 run through both sides of the conductive block 2, that is, the strip grooves 201 on both sides of the conductive block 2 are connected through the fixing holes 202; the plurality of fixing holes 202 are evenly distributed along the extension direction of the strip groove 201, and preferably, the fixing holes 202 are threaded holes in this embodiment. A plurality of connecting holes 302 are provided on the tab pressing plate 3, and the plurality of connecting holes 302 are distributed correspondingly to the fixing holes 202, and the connecting holes 302 on the tab pressing plates 3 on both sides of the conductive block 2 are staggered with each other, and the connecting holes 302 run through both sides of the tab pressing plate 3. The positive electrode ear 101 and the negative electrode ear 102 can be clamped by the conductive block 2 and the electrode ear pressing plate 3 to ensure the stability of the connection between the positive electrode ear 101 and the negative electrode ear 102 and the conductive block 2, and by respectively providing a strip groove 201 and a pressing plate protrusion 301 on the conductive block 2 and the electrode ear pressing plate 3, the contact area between the positive electrode ear 101 or the negative electrode ear 102 and the conductive block 2 is increased, and the positive electrode ear 101 or the negative electrode ear 102 is prevented from sliding off the electrode ear pressing plate 3 during use, thereby ensuring the stability of the installation of the positive electrode ear 101 and the negative electrode ear 102.

[0026] Bolts 4 are passed through the connecting hole 302 and the fixing hole 202, and the bolts 4 are used to fix the pole tab pressure plate 3 and the conductive block 2; wherein the side of the connecting hole 302 away from the conductive block 2 matches the shape of the bolt 4 head, and the depth of the connecting hole 302 is not less than the thickness of the bolt 4 head, so that after the conductive block 2 and the pole tab pressure plate 3 are fixed by the bolt 4, the top of the bolt 4 can not protrude from the surface of the pole tab pressure plate 3, thereby avoiding the protrusion of the bolt 4 on the top of the pole tab pressure plate 3 and causing safety hazards to the battery cell.

[0027] The tab pressing plate 3 is made of insulating material, preferably rubber material in this embodiment, and other insulating materials or insulating treatment processes can be used in other embodiments. When the tab pressing plate 3 is used to fix the positive tab 101 or the negative tab 102, the tab pressing plate 3 is prevented from being electrically connected to the outside world, so as to prevent the battery body 1 from being short-circuited during use, thereby ensuring the safety of the battery cell when in use.

[0028] The specific implementation process is as follows:

[0029] When assembling the soft-pack battery cells, the battery cell bodies 1 are stacked so that the positive pole ears 101 and the negative pole ears 102 on the battery cell bodies 1 are distributed correspondingly, and the conductive block 2 is placed between the positive pole ears 101 or the negative pole ears 102, so that the positive pole ears 101 or the negative pole ears 102 are laid on the pole ear 101 groove, so that the positive pole ears 101 and the negative pole ears 102 can be supported and protected by the conductive block 2; the pole ear pressing plate 3 is placed on both sides of the conductive block 2, and the pressing plate protrusion 301 is pressed into the strip groove 201, and the bolt 4 is passed through the connecting hole 302 on the pole ear pressing plate 3 and threadedly connected with the fixing hole 202 at the bottom of the strip groove 201, so that the positive pole ear 101 and the negative pole ear 102 are firmly fixed between the pole ear pressing plate 3 and the conductive block 2.

[0030] Compared with the prior art, in this solution, by arranging the conductive block 2 between the adjacent positive tabs 101 or negative tabs 102, the positive tabs 101 and negative tabs 102 of the multiple battery cell bodies 1 can be stably connected to the battery cell bracket, and the positive tabs 101 and negative tabs 102 are supported by the conductive block 2, so that the pressure on the positive tabs 101 and negative tabs 102 can be dispersed by the conductive block 2, avoiding the conductive block 2 from being damaged during use, affecting the safety of the positive tabs 101 and negative tabs 102 and the battery cell as a whole, and improving the neatness of the connection between the multiple positive tabs 101 or negative tabs 102. In addition, the conductive block 2 is fixedly connected to the tab pressing plate 3 by bolts 4, which ensures that the positive tabs 101 or negative tabs 102 are stably connected to the conductive block 2, and facilitates the disassembly and maintenance of the battery cell. And when the battery module needs to be connected in series or in parallel through a large number of battery cells, the adjacent positive pole ears 101 and negative pole ears 102 can be connected in parallel through contact copper bars, thereby improving the series or parallel operation of the battery module, improving the scalability of the battery cell, and meeting the assembly requirements of the battery cell for different battery modules.

[0031] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A tab connection structure for a large-capacity soft-pack battery cell, characterized in that: It comprises a plurality of battery cell bodies, which are stacked in sequence, and a positive pole ear and a negative pole ear are arranged on the same side of the battery cell body, and the positive pole ears and the negative pole ears of the plurality of battery cell bodies are spaced in sequence along the stacking direction; a conductive block for supporting the corresponding positive pole ear or negative pole ear is arranged between the positive pole ears or the negative pole ears on the same side of the plurality of battery cell bodies; pole ear pressing plates are arranged on the upper and lower surfaces of the conductive blocks, and a fixed space for inserting the pole ear is provided between each pole ear pressing plate and the upper or lower surface of the conductive block, and the pole ear pressing plate is fixed on the conductive block and locked with the pole ear through the fixed space to form a whole.

2. The tab connection structure of a large-capacity soft-pack battery cell according to claim 1, characterized in that: The conductive block is embedded between two adjacent positive electrode ears or negative electrode ears.

3. The tab connection structure of a large-capacity soft-pack battery cell according to claim 1, characterized in that: The conductive block and the tab pressing plate are provided with strip grooves at corresponding positions, and two ends of the strip groove pass through two ends of the conductive block.

4. The tab connection structure of a large-capacity soft-pack battery cell according to claim 3, characterized in that: A pressing plate protrusion is provided at the corresponding position of the tab pressing plate and the strip groove, and the shape of the pressing plate protrusion matches the shape of the strip groove.

5. The tab connection structure of a large-capacity soft-pack battery cell according to claim 4, characterized in that: The strip groove is an arc groove.

6. The tab connection structure of a large-capacity soft-pack battery cell according to claim 3, characterized in that: A plurality of fixing holes are formed at the bottom of the strip-shaped groove, and the plurality of fixing holes are evenly distributed along the extending direction of the strip-shaped groove, and the fixing holes penetrate through two sides of the conductive block.

7. The tab connection structure of a large-capacity soft-pack battery cell according to claim 6, characterized in that: The tab pressing plate is provided with a plurality of connection holes, the connection holes are distributed correspondingly to the fixing holes, and bolts are arranged in the connection holes and the fixing holes, and the bolts are used to fix the tab pressing plate and the conductive block.

8. The tab connection structure of a large-capacity soft-pack battery cell according to claim 7, characterized in that: The side of the connection hole away from the conductive block matches the shape of the bolt head, and the depth of the connection hole is not less than the thickness of the bolt head.

9. The tab connection structure of a large-capacity soft-pack battery cell according to claim 1, characterized in that: The tab pressing plate is made of insulating material.

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