Top sealing structure of battery monomer and battery monomer adopting top sealing structure

Abstract

The utility model relates to a battery monomer top sealing structure and a battery monomer adopting the same, the battery monomer top sealing structure comprises a shell and a sealing head, and the top and / or the bottom of the shell are / is provided with a sealing area; the sealing heads are arranged on the shell, the sealing heads are opposite to each other, a clamping area is formed between the sealing heads, and the sealing area of the shell is arranged in the clamping area; the sealing head comprises an upper sealing head and a lower sealing head, the upper sealing head and the lower sealing head are arranged from top to bottom, and a first gap is formed between the upper sealing head and the lower sealing head; and the sealing heads move towards the clamping area, and the shell is jointly clamped between the sealing heads, so that the sealing area of the shell is sealed. According to the stable sealing structure, through the design of the clamping area, the shell is jointly clamped between the end sockets, and it is ensured that the sealing area is stably sealed.

Description

Technical Field

[0001] The utility model relates to a top sealing structure of a battery monomer and a battery monomer adopting the structure. Background Art

[0002] With the application of sodium-ion batteries in large-scale energy storage, the capacity of single cells is getting larger and larger, and the power needs to be larger and larger. At the same time, reducing the number of parallel batteries when combined is conducive to improving efficiency and reducing costs. Although there are currently three types of sodium batteries in terms of appearance, cylindrical, square aluminum shell and aluminum-plastic film soft package, both semi-solid and all-solid batteries are produced in soft package form.

[0003] Furthermore, there are two very important links in soft-pack semi-solid and all-solid-state sodium batteries, top sealing and side sealing. Side sealing is relatively simple, which is just the thermal composite of upper and lower aluminum-plastic films, but top sealing is complex, involving the thermal composite of positive and negative electrode metal strips, packaging glue (or selant), and upper and lower aluminum-plastic films at multiple interfaces and levels. It cannot be over-sealed or not sealed firmly. Moreover, for large-sized energy storage and large-capacity sodium batteries, especially large-sized ones with a top-sealed packaging length of 1000-2000MM, top sealing is more difficult. In order to stably and continuously produce qualified products, it is necessary to invent a top-sealing structure that cannot be over-sealed or not sealed firmly. This is very important. Utility Model Content

[0004] The first object of the utility model is to provide a top sealing structure of a battery cell which improves packaging reliability and adapts to large-size energy storage requirements.

[0005] The second object of the utility model is to provide a battery cell that improves packaging reliability, enhances safety and durability, and adapts to large-size energy storage requirements.

[0006] The first purpose of the utility model is achieved in this way:

[0007] A top sealing structure of a battery cell, comprising a shell and a sealing head, wherein the top and / or bottom of the shell are both provided with sealing areas;

[0008] The sealing heads are arranged on the shell, the sealing heads are opposite to each other, and a clamping area is formed between the sealing heads, and the sealing area of ​​the shell is placed in the clamping area;

[0009] The head includes an upper head and a lower head, the upper head and the lower head are arranged from top to bottom, and a first gap is formed between the upper head and the lower head;

[0010] The sealing head moves toward the clamping area, and the sealing head and the sealing head clamp the shell together, thereby closing the sealing area of ​​the shell.

[0011] Stable sealing structure: Through the design of the clamping area, the heads clamp the shell together to ensure the stable sealing of the sealing area. This design effectively prevents the loosening or cracking of the sealing area and improves the sealing and safety of the battery cell.

[0012] Reduce the risk of leakage: Since the seal head and the shell are clamped, the risk of leakage in the battery cell sealing area is reduced. This clamping structure can effectively prevent the electrolyte inside the battery from leaking out, reducing the possibility of accidents.

[0013] Adapt to large-size battery cells: This design is particularly suitable for large-size energy storage and large-capacity sodium battery cells, especially large-size battery cells with a top seal package length of 1000-2000mm. The design of the clamping area ensures a tight connection between the head and the shell even in large sizes, ensuring the stability and reliability of the entire battery cell.

[0014] Improve packaging reliability and stability: By changing the head from an integral type to a split type and increasing the intermediate interval, it is equivalent to performing two packaging processes. This design can improve the sealing and stability between the head and the shell, and reduce the risk of the head falling off or the packaging being loose. This is especially important for the top seal of large-size energy storage and large-capacity sodium batteries, which helps to ensure the long-term stability and safety of the battery during use.

[0015] Enhanced safety and durability: As the connection between the head and the shell is more solid, the split head design can enhance the safety and durability of the battery cells. This helps to reduce potential safety hazards such as leakage and short circuit during transportation and use of the battery, improves the safety and reliability of the battery, and extends the battery life.

[0016] Adapting to large-size energy storage needs: As the application of sodium batteries in large-scale energy storage systems continues to expand, packaging technology needs to adapt to larger-sized battery cells. The newly designed top seal structure not only improves the reliability and stability of the package, but also better adapts to the packaging needs of large-size energy storage and large-capacity sodium batteries, which is conducive to meeting large-capacity energy storage needs and improving the overall performance and reliability of the system.

[0017] Optimize battery performance: The stable closed structure helps prevent external environmental factors such as moisture and dust from affecting the internal battery, thereby protecting the internal components of the battery, extending the battery life, and optimizing its performance.

[0018] The first purpose of the utility model can also be solved by the following technical measures:

[0019] Furthermore, the upper sealing head is provided with an upper groove toward the sealing area, and the lower sealing head is provided with a lower groove toward the sealing area.

[0020] Uniform filling of sealant: The design of the grooves on the upper and lower heads allows the hot melt sealant to be more evenly filled into the grooves during the clamping process. This ensures that the sealant is more evenly distributed in the sealing area, avoiding the situation of too little or too much sealant, thereby improving the quality and stability of the seal. It also ensures that the hot melt sealant fully wraps the positive ear, ensuring that the positive ear and the shell are tightly bonded together by the hot melt sealant, thereby ensuring the bonding quality and stability. It also ensures that the hot melt sealant fully wraps the negative ear, ensuring that the negative ear and the shell are bonded by the hot melt sealant, thereby improving the sealing, stability and safety of the top sealing structure of the battery cell.

[0021] Enhance the sealing of the sealing area: The groove design allows the sealant to better contact the shell (aluminum-plastic film), fill the inside of the groove, and form a tighter sealing structure. This tight sealing structure effectively prevents the penetration of external environmental substances and the leakage of electrolyte, further improving the sealing and safety of the battery cell.

[0022] Prevent hot melt sealant from extrusion and deformation: The groove provides additional space to reduce the extrusion pressure of the hot melt sealant and avoid excessive deformation of the hot melt sealant during the clamping process. This helps ensure that the bonding quality between the positive and negative tabs and the shell is not affected by extrusion deformation, and improves the stability and durability of the connection.

[0023] Optimize the combination of the head and the shell: The introduction of the groove allows the sealant to better adhere to the head and the shell, enhancing the bonding between the two. This helps prevent loosening or leaks between the head and the shell, improves the stability of the sealing area, and further enhances the overall stability of the battery cell.

[0024] Improve production consistency: The groove design makes it easier for the hot melt sealant to be filled into the specified position during the clamping process, reducing human operation errors in production and improving production consistency. This helps ensure that the sealing quality of each battery cell can meet the same high standards, improving the quality stability and reliability of the product.

[0025] Enhanced safety of battery cells: Ensuring strong adhesion between the positive and negative tabs and the shell can prevent the movement or fall-off of internal battery components, thereby reducing the risk of battery failure during transportation and use. This helps improve the safety of battery cells and reduces potential safety hazards caused by loose connections.

[0026] Furthermore, the upper head and the lower head are both copper heads.

[0027] Good corrosion resistance: Copper has good corrosion resistance and can maintain stability in the harsh environment inside the battery. This helps to extend the service life of the head, reduce head damage or failure caused by corrosion, and improve the reliability and durability of the battery.

[0028] Excellent mechanical strength: The copper head has high mechanical strength and rigidity, and can provide good support and protection. This helps prevent the head from being deformed or broken due to external impact or vibration during battery use, thereby ensuring the structural integrity and safety of the battery cell.

[0029] In summary, the use of copper heads has corrosion resistance and mechanical strength, which helps to improve the performance, stability and safety of battery cells and is an important design choice.

[0030] Furthermore, the shell is an aluminum-plastic film.

[0031] Lightweight design: Aluminum-plastic film is a lightweight material with lower density and lighter weight than traditional metal shells. Therefore, using aluminum-plastic film as a shell can significantly reduce the overall weight of the battery cell, which helps to improve the convenience of carrying and installing the battery assembly.

[0032] Good sealing performance: The aluminum-plastic film has excellent sealing performance, which can effectively prevent electrolyte leakage or foreign substances from entering the battery. This helps to protect the internal components of the battery from the influence of the external environment and improve the safety and stability of the battery.

[0033] Corrosion resistance and wear resistance: Aluminum plastic film has high corrosion resistance and wear resistance, and can maintain stability in complex working environments. This helps to extend the service life of the battery, reduce shell damage or corrosion caused by external environmental factors, and improve the reliability and durability of the battery.

[0034] Good formability and processability: Aluminum-plastic film has good formability and processability, and can be processed into shells of different shapes and sizes through various molding processes. This makes the production process more flexible and diverse, which is conducive to the design of battery cells that meet the requirements of different sizes and shapes, and improves the efficiency and flexibility of battery production.

[0035] Environmentally friendly and sustainable: Aluminum-plastic film is an environmentally friendly material with good recyclability and reusability. Using aluminum-plastic film as the shell can reduce the consumption of traditional metal resources, help reduce environmental load, and meet the requirements of sustainable development.

[0036] In summary, the use of aluminum-plastic film as the shell has many beneficial effects such as lightweight, good sealing performance, corrosion resistance and wear resistance, good formability and processability, and environmental sustainability. It is a design option with potential application value.

[0037] The second purpose of the utility model is achieved in this way:

[0038] A battery cell with a top-sealed structure, further comprising an electrode assembly and an electrolyte, wherein the housing is used to contain the electrode assembly and the electrolyte, wherein the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator, and wherein the electrode assembly is provided with a positive electrode tab and a negative electrode tab;

[0039] At least two sheets of hot-melt sealant are arranged in the sealing area, and the multiple sheets of hot-melt sealant are arranged from top to bottom, and a second gap is formed between two adjacent sheets of hot-melt sealant;

[0040] The position of the first piece of hot melt sealant corresponds to the position of the upper head on the left side of the sealing area;

[0041] The position of the second piece of hot melt sealant corresponds to the position of the lower head on the left side of the sealing area;

[0042] The position of the third piece of hot melt sealant corresponds to the position of the upper head on the right side of the sealing area;

[0043] The position of the fourth piece of hot melt sealant corresponds to the position of the lower head on the right side of the sealing area;

[0044] The position of the first gap corresponds to the position of the second gap;

[0045] The positive electrode ear extends out of the shell through the sealing area on the top of the shell, the shell is clamped together by the head and the head, and the sealing area of ​​the shell is bonded by hot-melt sealant to close the sealing area, and the shell and the positive electrode ear are bonded by hot-melt sealant;

[0046] The negative electrode ear extends out of the shell through the sealing area at the bottom of the shell, the shell is clamped together by the head and the head, and the sealing area of ​​the shell is bonded by hot melt sealant to close the sealing area, and the shell and the negative electrode ear are bonded by hot melt sealant;

[0047] The positive electrode ear and the negative electrode ear are arranged opposite to each other.

[0048] Double sealing protection of multiple layers of hot melt sealant: By setting at least two sheets of hot melt sealant in the sealing area and forming a first gap between two adjacent sheets of hot melt sealant, double sealing protection can be achieved. This design can effectively prevent the leakage of electrolyte and the penetration of external environmental substances, and improve the safety and stability of the battery cell.

[0049] Optimize the bonding of the sealing area: By setting hot melt sealant, the shell is clamped between the heads and the shell is bonded to the positive and negative tabs, further enhancing the bonding force of the sealing area. This helps prevent loosening or leaking of the sealing area and improves the sealing and stability of the battery cell.

[0050] Effective fixation of electrode ears: The positive and negative electrode ears extend out of the shell through the sealing areas at the top and bottom of the shell, and are effectively fixed to the shell by hot-melt sealant. This design can prevent the loosening or breaking of the electrode ears, ensure the stable connection between the electrode assembly and the external circuit, and improve the reliability and safety of the battery.

[0051] Improve production efficiency: The structural design simplifies the packaging process and reduces the number of operating steps in production. By applying hot melt sealant to the sealing area, automated production can be achieved, which improves production efficiency and consistency and reduces production costs.

[0052] In summary, this top sealing structure design of the battery cell has beneficial effects such as double sealing protection, optimized sealing area combination, effective fixation of electrode ears and improved production efficiency, which can significantly improve the safety, stability and production efficiency of the battery cell.

[0053] The second purpose of the utility model can also be solved by the following technical measures:

[0054] Furthermore, the length of the hot melt sealant is shorter than the length of the shell.

[0055] Furthermore, the width of the hot melt sealant ranges from 5 mm to 8 mm.

[0056] Furthermore, the positive electrode sheets and the negative electrode sheets are stacked in sequence, and the separator is disposed between adjacent positive electrode sheets and negative electrode sheets;

[0057] The positive electrode ear and the negative electrode ear are arranged opposite to each other and are both exposed from the diaphragm;

[0058] The shell surrounds the positive electrode sheet, the negative electrode sheet and the diaphragm and the electrolyte is arranged in the shell;

[0059] The electrolyte includes sodium hexafluorophosphate and an organic solvent.

[0060] The aluminum-plastic film surrounds the positive electrode sheet, the negative electrode sheet and the separator, and the electrolyte is arranged in the aluminum-plastic film;

[0061] The electrolyte includes sodium hexafluorophosphate and an organic solvent.

[0062] Enhanced safety: The introduction of aluminum-plastic film can provide an additional physical protection layer, effectively isolate the electrode assembly and electrolyte, reduce the impact of the external environment on the battery, reduce the risk of short circuit or external damage to the battery, and thus improve the safety of the battery.

[0063] Improve stability: The aluminum-plastic film can protect the electrode assembly and electrolyte, reduce the instability factors inside the battery caused by changes in the external environment, and help improve the stability and long-term performance of the battery.

[0064] Improve electrolyte distribution: The electrolyte is set inside the aluminum-plastic film, which can cover the positive electrode sheet, negative electrode sheet and separator more evenly, which helps to improve the distribution and uniformity of the electrolyte and improve the electrochemical performance and cycle stability of the battery.

[0065] Increase the energy density of the battery: The design of wrapping the electrode assembly and electrolyte with aluminum-plastic film can effectively improve the energy density of the battery. The aluminum-plastic film has a light weight and high mechanical strength, which can reduce the weight of the battery and thus increase the energy density of the battery.

[0066] Optimize battery structure: The positive and negative electrodes are arranged opposite to each other and exposed from the diaphragm, making it easier to connect the electrode assembly to the external circuit, thus improving the assembly efficiency and compactness of the battery.

[0067] In summary, the introduction of the aluminum-plastic film design not only improves the safety and stability of the battery, but also helps to optimize the electrolyte distribution, increase the energy density and optimize the battery structure. It is an innovative design with multiple advantages.

[0068] Furthermore, the number of the positive electrode sheet is one less than that of the negative electrode sheet.

[0069] Reduced manufacturing costs: Reducing one positive electrode sheet can reduce the manufacturing cost of the battery. Positive electrodes usually contain rare metals or high-cost materials, while negative electrodes usually use more common materials. Therefore, reducing one positive electrode sheet can save material costs and reduce the manufacturing cost of the battery.

[0070] Improve energy efficiency: Optimizing the reaction balance between the positive and negative electrodes can improve the energy efficiency of the battery. One less positive electrode sheet than the negative electrode sheet may lead to a more appropriate positive and negative electrode reaction ratio, thereby improving the energy conversion efficiency of the battery and extending the battery life.

[0071] Furthermore, the separator is arranged outside the outermost negative electrode sheet.

[0072] Enhanced battery safety: Placing the separator outside the outermost negative electrode sheet can effectively isolate the positive and negative electrodes of the battery, reducing direct contact between the positive and negative electrodes and the possible short circuit risk. This can reduce the possibility of battery failure during use and improve battery safety.

[0073] Furthermore, the separator is arranged on the outer side of the outermost negative electrode sheet, and the separator is a single piece.

[0074] The beneficial effects of the utility model are as follows:

[0075] The utility model changes the sealing head from an integral type to a split type and increases the intermediate interval, which is equivalent to performing two packaging processes. Such a design can improve the sealing and stability between the sealing head and the shell, and reduce the risk of the sealing head falling off or the sealing being loose. This is particularly important for the top sealing of large-sized energy storage and large-capacity sodium batteries, which helps to ensure the long-term stability and safety of the battery during use.

[0076] In the utility model, the design of the upper groove and the lower groove enables the hot melt sealant to be more evenly filled and enter the groove during the process of clamping the head. This ensures that the hot melt sealant fully wraps the positive ear, ensures that the positive ear, the upper head, the lower head and the shell are tightly bonded together by the hot melt sealant, thereby ensuring the bonding quality and stability. This also ensures that the hot melt sealant fully wraps the negative ear, ensures that the negative ear, the upper head, the lower head and the shell are bonded together by the hot melt sealant, thereby improving the sealing, stability and safety of the top sealing structure of the battery cell.

[0077] The design of the groove of the utility model can make the sealant contact with the shell (aluminum-plastic film) better, fill the inside of the groove, and form a more compact sealing structure. This compact sealing structure effectively prevents the penetration of external environmental substances and the leakage of electrolyte, and further improves the sealing and safety of the battery cell.

[0078] The utility model can more effectively fix the connection between the positive and negative tabs and the shell by dividing a traditional hot melt sealant into two or more pieces for bonding, thereby ensuring the quality and reliability of the package. This design can solve the problem that the traditional tab structure is prone to loose sealing and over-sealing short circuit, improve the packaging quality and stability of the battery, and reduce the risk of battery leakage and swelling.

[0079] The utility model can better control the parallelism between the positive and negative tabs and the shell due to the setting method of the hot melt sealant. This design can effectively improve the parallelism control ability in the manufacturing process and reduce the situation of poor packaging quality caused by parallelism problems. Especially for large-sized batteries, the control of parallelism is particularly important, and this design can effectively improve the manufacturing quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 Schematic diagram of a battery cell (excluding the head).

[0081] Figure 2 A schematic diagram of a battery cell.

[0082] Figure 3 The left side view of the battery cell.

[0083] Figure 4 A cross-sectional view of a battery cell.

[0084] Figure 5 for Figure 4 Schematic diagram of part A.

[0085] Figure 6 for Figure 4 Schematic diagram of part B.

[0086] Figure 7 Schematic diagram of a battery cell (excluding the shell and head).

[0087] Figure 8 Schematic diagram of the electrode assembly of a battery cell. DETAILED DESCRIPTION

[0088] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0089] Example, combined with Figures 1 to 8 As shown, a top sealing structure of a battery cell includes a shell and a sealing head 7, and the top and / or bottom of the shell are both provided with a sealing area 51;

[0090] The sealing heads 7 are arranged on the shell, the sealing heads 7 are opposite to each other, and a clamping area 71 is formed between the sealing heads 7, and the sealing area 51 of the shell is placed in the clamping area 71;

[0091] The sealing head 7 includes an upper sealing head 9 and a lower sealing head 10, which are arranged from top to bottom, and a first gap 6 is formed between the upper sealing head 9 and the lower sealing head 10;

[0092] The sealing head 7 moves toward the clamping area 71 , and the sealing heads 7 and the sealing heads 7 clamp the shell together, thereby closing the sealing area 51 of the shell.

[0093] Furthermore, the upper sealing head 9 is provided with an upper groove 73 toward the sealing area 51 , and the lower sealing head 10 is provided with a lower groove 72 toward the sealing area 51 .

[0094] Furthermore, the upper head 9 and the lower head 10 are both copper heads 7.

[0095] Furthermore, the shell is an aluminum-plastic film 5 .

[0096] A battery cell with a top-sealed structure, further comprising an electrode assembly 70 and an electrolyte, wherein the housing is used to contain the electrode assembly 70 and the electrolyte, wherein the electrode assembly 70 is composed of a positive electrode sheet 1, a negative electrode sheet 2 and a separator 3, and wherein the electrode assembly 70 is provided with a positive electrode tab 11 and a negative electrode tab 12;

[0097] At least two pieces of hot melt sealant 4 are arranged in the sealing area 51, and the multiple pieces of hot melt sealant 4 are arranged from top to bottom, and a second gap 8 is formed between two adjacent pieces of hot melt sealant 4;

[0098] The position of the first piece of hot melt sealant 4 corresponds to the position of the upper sealing head 9 on the left side of the sealing area 51;

[0099] The position of the second piece of hot melt sealant 4 corresponds to the position of the lower sealing head 10 on the left side of the sealing area 51;

[0100] The position of the third piece of hot melt sealant 4 corresponds to the position of the upper sealing head 9 on the right side of the sealing area 51;

[0101] The position of the fourth piece of hot melt sealant 4 corresponds to the position of the lower sealing head 10 on the right side of the sealing area 51;

[0102] The position of the first gap 6 corresponds to the position of the second gap 8;

[0103] The positive electrode ear 11 passes through the sealing area 51 on the top of the shell and extends out of the shell. The shell is clamped together by the head 7 and the head 7. The sealing area 51 of the shell is bonded by the hot melt sealant 4, so as to close the sealing area 51. At the same time, the shell and the positive electrode ear 11 are bonded by the hot melt sealant 4.

[0104] The negative electrode ear 12 extends out of the shell through the sealing area 51 at the bottom of the shell, and the shell is clamped together by the head 7 and the head 7. The sealing area 51 of the shell is bonded by the hot melt sealant 4, so as to close the sealing area 51, and the shell and the negative electrode ear 12 are bonded by the hot melt sealant 4;

[0105] The positive electrode tab 11 and the negative electrode tab 12 are arranged opposite to each other.

[0106] Furthermore, the length of the hot melt sealant 4 is smaller than the length of the shell.

[0107] Furthermore, the width of the hot melt sealant 4 is in the range of 5 mm to 8 mm.

[0108] Furthermore, the positive electrode sheet 1 and the negative electrode sheet 2 are stacked in sequence, and the separator 3 is disposed between adjacent positive electrode sheets 1 and negative electrode sheets 2;

[0109] The positive electrode tab 11 and the negative electrode tab 12 are arranged opposite to each other and are both exposed from the diaphragm 3;

[0110] The shell surrounds the positive electrode sheet 1, the negative electrode sheet 2 and the separator 3, and the electrolyte is arranged in the shell;

[0111] The electrolyte includes sodium hexafluorophosphate and an organic solvent.

[0112] Furthermore, the number of the positive electrode sheet 1 is less than that of the negative electrode sheet 2 .

[0113] Furthermore, the separator 3 is disposed outside the outermost negative electrode sheet 2, and the separator 3 is a single piece.

[0114] In the present invention, a battery cell of BT120888699, a capacity of 600Ah, a top seal length of 1200mm, and a width of 10mm is made, and two pieces of hot melt sealant 4 with a size of 430mm*8mm are used, and the gap between the two pieces is 8mm. The top seal structure of the battery cell of the present invention is adopted, and the packaging effect test is as follows.

[0115]

Claims

1. A top sealing structure of a battery cell, comprising a shell and a sealing head (7), characterized in that: The top and / or bottom of the shell are both provided with a sealing area (51); The sealing heads (7) are arranged on the shell, the sealing heads (7) and the sealing heads (7) are opposite to each other, and a clamping area (71) is formed between the sealing heads (7) and the sealing area (51) of the shell is placed in the clamping area (71); The sealing head (7) comprises an upper sealing head (9) and a lower sealing head (10), wherein the upper sealing head (9) and the lower sealing head (10) are arranged from top to bottom, and a first gap (6) is formed between the upper sealing head (9) and the lower sealing head (10); The sealing head (7) moves toward the clamping area (71), and the sealing heads (7) and the sealing heads (7) clamp the shell together, thereby closing the sealing area (51) of the shell.

2. The top sealing structure of the battery cell according to claim 1, characterized in that: The upper sealing head (9) is provided with an upper groove (73) facing the sealing area (51), and the lower sealing head (10) is provided with a lower groove (72) facing the sealing area (51).

3. The top sealing structure of the battery cell according to claim 1, characterized in that: The upper sealing head (9) and the lower sealing head (10) are both copper sealing heads.

4. The top sealing structure of the battery cell according to claim 1, characterized in that: The shell is an aluminum-plastic film (5).

5. A battery cell using the top sealing structure of the battery cell according to any one of claims 1 to 4, characterized in that: Also included is an electrode assembly (70) and an electrolyte, the housing being used to contain the electrode assembly (70) and the electrolyte, the electrode assembly (70) being composed of a positive electrode sheet (1), a negative electrode sheet (2) and a separator (3), and the electrode assembly (70) being provided with a positive electrode tab (11) and a negative electrode tab (12); At least two sheets of hot-melt sealant (4) are arranged in the sealing area (51), and the multiple sheets of hot-melt sealant (4) are arranged from top to bottom, and a second gap (8) is formed between two adjacent sheets of hot-melt sealant (4); The position of the first piece of hot melt sealant (4) corresponds to the position of the upper sealing head (9) on the left side of the sealing area (51); The position of the second piece of hot melt sealant (4) corresponds to the position of the lower sealing head (10) on the left side of the sealing area (51); The position of the third piece of hot melt sealant (4) corresponds to the position of the upper sealing head (9) on the right side of the sealing area (51); The position of the fourth piece of hot melt sealant (4) corresponds to the position of the lower sealing head (10) on the right side of the sealing area (51); The position of the first gap (6) corresponds to the position of the second gap (8); The positive electrode ear (11) extends out of the shell through the sealing area (51) at the top of the shell, and the shell is clamped together by the head (7) and the head (7). The sealing area (51) of the shell is bonded by hot-melt sealant (4), thereby sealing the sealing area (51), and at the same time, the shell and the positive electrode ear (11) are bonded by hot-melt sealant (4); The negative electrode ear (12) extends out of the shell through the sealing area (51) at the bottom of the shell, and the shell is clamped together by the sealing head (7) and the sealing head (7). The sealing area (51) of the shell is bonded by hot-melt sealant (4), thereby sealing the sealing area (51), and at the same time, the shell and the negative electrode ear (12) are bonded by hot-melt sealant (4); The positive electrode lug (11) and the negative electrode lug (12) are arranged opposite to each other.

6. The battery cell according to claim 5, characterized in that: The length of the hot melt sealant (4) is shorter than the length of the shell.

7. The battery cell according to claim 5, characterized in that: The width of the hot melt sealant (4) is in the range of 5 mm to 8 mm.

8. The battery cell according to claim 5, characterized in that: The positive electrode sheets (1) and the negative electrode sheets (2) are stacked in sequence, and the separator (3) is arranged between adjacent positive electrode sheets (1) and negative electrode sheets (2); The positive electrode tab (11) and the negative electrode tab (12) are arranged opposite to each other and are both exposed from the diaphragm (3); The shell surrounds the positive electrode sheet (1), the negative electrode sheet (2) and the diaphragm (3), and the electrolyte is arranged in the shell; The electrolyte includes sodium hexafluorophosphate and an organic solvent.

9. The battery cell according to claim 5, characterized in that: The number of the positive electrode sheet (1) is one less than that of the negative electrode sheet (2).

10. The battery cell according to claim 5, characterized in that: The separator (3) is arranged outside the outermost negative electrode sheet (2), and the separator (3) is a single sheet.

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