Energy storage battery and method of assembling the same

Abstract

The application discloses an energy storage battery and an assembling method thereof, and relates to the technical field of energy storage batteries. The energy storage battery comprises an integrated shell, a second top cover part, a full-tab winding core, a current collector and conductive glue. The integrated shell is integrally stamped and formed by a main body part and a first top cover part, and the opening end is closed by the second top cover part. The tabs of the full-tab winding core are fixed and electrically connected to the current collector and the pole by the conductive glue. The energy storage battery completely replaces the welding process at the tab connection by means of heating and curing of the conductive glue, light curing and the like, eliminates the risks of welding dust, virtual welding and the like, and improves safety and assembly yield.

Description

Technical Field

[0001] This invention relates to the field of energy storage battery technology, and in particular to an energy storage battery and its assembly method. Background Technology

[0002] Rechargeable batteries (such as lithium-ion batteries) are widely used in consumer electronics, electric vehicles, and energy storage systems due to their advantages such as high voltage, high energy density, long cycle life, and low self-discharge rate. Traditional square aluminum-cased batteries typically employ the following structure: a wound electrode assembly is placed inside a metal casing. The electrode assembly is formed by winding positive and negative electrode plates and a separator. The tabs leading out of the electrode assembly are welded to the positive and negative electrode posts on the top cover via metal connecting pieces. Subsequently, the top cover is sealed to the casing using laser welding.

[0003] However, traditional battery structures have many shortcomings. First, current technologies generally use laser welding or ultrasonic welding to connect the tabs and the top cover. The welding process generates metal dust and welding slag. Once this dust enters the cell electrode, larger metal particles may directly pierce the separator, causing a short circuit between the positive and negative electrodes. Furthermore, dissolved metal ions deposited and accumulated on the negative electrode surface may also pierce the separator, creating a short circuit, seriously threatening battery safety. In addition, laser welding also suffers from problems such as sparks and incomplete welds, further affecting welding yield and product consistency.

[0004] Secondly, in traditional wound battery cells, the tabs are typically formed from the blank areas left during electrode coating, limiting the number of layers per group of tabs after winding. Due to the limitations of ultrasonic welding technology, the maximum number of layers that can be stably processed in a single welding operation is approximately 60 layers. Exceeding this number easily leads to problems such as incomplete welding and weak solder joints. Simultaneously, the limited conductive cross-sectional area of ​​a single group of tabs restricts the electron flow rate, making it difficult to meet the performance requirements of high-rate charging and discharging.

[0005] To improve overcurrent capability, full-tab battery technology has emerged in recent years. The full-tab design exposes the entire metal foil on one edge of the electrode to form a continuous conductive surface, significantly reducing the cell's internal resistance and greatly reducing heat generated during charging and discharging, thus supporting higher charge-discharge rates. However, existing full-tab battery structures still have many shortcomings: Connection methods still primarily rely on welding. Existing full-tab designs often use L-shaped adapter plates or boss adapter plates to connect the full-tab end face to the top cover. The connection between the tab and the adapter plate still requires ultrasonic welding or laser welding, which occupies a large space and results in low utilization of the internal space of the cell. At the same time, the problem of metal dust generated during the welding process has not been fundamentally solved.

[0006] The application of conductive adhesive is limited to assisting welding. Some solutions propose using conductive adhesive to enhance the electrical contact between the tab and the housing, improving contact loosening after drops; others employ a hybrid process of "welding + conductive adhesive-assisted bonding," but welding remains the core connection step. Risks inherent in the welding process still exist. Summary of the Invention

[0007] The purpose of this invention is to provide an energy storage battery and its assembly method to solve the problems existing in the prior art and reduce or eliminate the risks associated with the welding process.

[0008] To achieve the above objectives, the present invention provides the following solution: This invention provides an energy storage battery, comprising: an integrated casing, a second top cover, a positive terminal, a negative terminal, at least one all-electrode coil core, a first current collector, a second current collector, and conductive adhesive; the integrated casing includes an integrally formed main body and a first top cover, the first top cover being integrally stamped during the forming process of the main body, with one side of the main body opposite to the first top cover open to form an opening; a second top cover is used to fix it at the opening of the integrated casing; the positive and negative terminals are disposed on the two top covers; the all-electrode coil core is disposed within the main body, the all-electrode coil core having all-electrode... The device comprises a positive electrode tab and a omnipolar electrode tab and a negative electrode tab; a first current collector and a second current collector are respectively disposed between the omnipolar electrode tab core and the two top cover portions; conductive adhesive is disposed between the positive electrode tab and the first current collector, between the first current collector and the positive electrode post, and between the negative electrode tab and the second current collector, and between the second current collector and the negative electrode post. After the conductive adhesive is cured by heating or light curing, it fixes and electrically connects the positive electrode tab to the first current collector, the first current collector to the positive electrode post, the negative electrode tab to the second current collector, and the second current collector to the negative electrode post.

[0009] In some embodiments, an explosion-proof pressure relief structure is also included, which is located on at least one side of the main body and is separate from the top cover. The explosion-proof pressure relief structure is located on the narrow side of the main body and is separated from the top cover to achieve thermal and electrical separation.

[0010] In some embodiments, the conductive adhesive is a multifunctional thermosetting hybrid conductive adhesive or a multifunctional photosensitive hybrid conductive adhesive, comprising a resin matrix, a conductive agent, and a curing agent.

[0011] In some embodiments, the resin matrix is ​​selected from one or more of epoxy resins, phenolic resins, urea-formaldehyde resins, or unsaturated polyester resins.

[0012] In some embodiments, the conductive agent is an inorganic-metal composite conductive agent, comprising metallic conductive materials and non-metallic conductive materials.

[0013] In some embodiments, the conductive adhesive further includes PTC ceramic powder with a positive temperature coefficient.

[0014] In some embodiments, an insulating Mylar is also included, which wraps around the outside of the omnipolar lug core to insulate the omnipolar lug core from the integrated housing.

[0015] In some embodiments, an insulating bracket is fixed to the inner side of the top cover to protect the full electrode tab.

[0016] In some embodiments, the positive and negative terminals are integrally formed on the two top cover portions.

[0017] The present invention also provides an assembly method for the energy storage battery as described above, wherein the positive electrode tab and the first current collector, the first current collector and the positive electrode post, the negative electrode tab and the second current collector, and the second current collector and the negative electrode post are fixed and electrically connected by conductive adhesive.

[0018] The present invention achieves the following technical effects compared to the prior art: This invention uses conductive adhesive to sequentially bond and fix the tabs, current collectors, and terminals to form an electrical connection, completely replacing the laser welding or ultrasonic welding processes in traditional solutions. Since the welding operation is eliminated, there is no need to reserve processing space for the welding head in the tab connection area, thus significantly improving the internal space utilization of the battery cell. Larger cells or thicker electrodes can be accommodated within the same casing size, thereby increasing the battery's energy density. Simultaneously, the problems of metal dust and welding slag generated during welding are eliminated at the source, avoiding the risk of internal short circuits caused by metal particles piercing the separator or the accumulation of metal ions, improving battery safety and long-term reliability. Furthermore, the coating and curing process of the conductive adhesive has lower equipment requirements, eliminating the need to purchase expensive laser welding or ultrasonic welding equipment, reducing the initial investment cost of the production line; and the coating process has good consistency, avoiding yield losses common in welding processes such as incomplete welds, explosions, and tab breakage, which is beneficial to improving production efficiency and product consistency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An exploded view of the structure of the energy storage battery provided by this invention; Figure 2 This is a schematic diagram of the integrated housing structure; Figure 3 A schematic diagram of the structure of the second top cover and the first collector plate; Figure 4 This is a schematic diagram of the current collector structure; Figure 5 A schematic diagram of the structure of the all-polar ear winding core; In the diagram: 1-Integrated housing; 2-Second top cover; 3-Negative electrode post; 4-All-pole lug core; 5-First current collector; 6-Second current collector; 7-Sealing adhesive nail; 8-Sealing aluminum nail; 9-Insulating bracket; 10-Explosion-proof pressure relief structure; 11-Explosion-proof valve patch; 12-Insulating Mylar; 13-Outer insulating film; 14-Core binding adhesive; 15-All-pole lug; 501-Raised strip; 101-Main body; 102-First top cover. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide an energy storage battery and its assembly method to solve the problems existing in the prior art and reduce or eliminate the risks associated with the welding process.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0025] Example 1 This invention provides an energy storage battery, such as Figure 1As shown, it includes: an integrated housing 1, a second top cover 2, a positive terminal post, a negative terminal post 3, at least one omnipolar ear coil 4, a first current collector 5, a second current collector 6, and conductive adhesive; the integrated housing 1 includes an integrally formed main body 101 and a first top cover 102, the first top cover 102 being integrally stamped and formed along with the main body 101 during the forming process, and the side of the main body 101 opposite to the first top cover 102 being open to form an opening; the second top cover 2 is used to fix it at the opening of the integrated housing 1; the positive terminal post and the negative terminal post 3 are disposed on the two top cover portions; the omnipolar ear coil 4 is disposed on the main body 101. Inside the body 101, the all-pole core 4 has an all-pole positive tab and an all-pole negative tab; the first current collector 5 and the second current collector 6 are respectively disposed between the all-pole core 4 and the two top covers; conductive adhesive is disposed between the positive tab and the first current collector 5, between the first current collector 5 and the positive terminal, and between the negative tab and the second current collector 6, and between the second current collector 6 and the negative terminal 3. After the conductive adhesive is cured by heating / light curing or other curing methods, it fixes and electrically connects the positive tab to the first current collector 5, the first current collector 5 to the positive terminal, the negative tab to the second current collector 6, and the second current collector 6 to the negative terminal 3.

[0026] This embodiment uses conductive adhesive to sequentially bond and fix the tabs, current collectors, and terminals to form an electrical connection, completely replacing the laser welding or ultrasonic welding process in traditional solutions. Since the welding operation is eliminated, there is no need to reserve processing space for the welding head in the tab connection area, thus significantly improving the internal space utilization of the cell. Larger cells or thicker electrodes can be accommodated within the same casing size, thereby increasing the battery's energy density. Simultaneously, the problems of metal dust and welding slag generated during welding are eliminated at the source, avoiding the risk of internal short circuits caused by metal particles piercing the separator or the accumulation of metal ions, improving battery safety and long-term reliability. Furthermore, the coating and curing processes of the conductive adhesive have lower equipment requirements, eliminating the need to purchase expensive laser welding or ultrasonic welding equipment, reducing the initial investment cost of the production line. Moreover, the coating process has good consistency, avoiding yield losses common during welding such as incomplete welds, explosions, and tab breakage, which helps improve production efficiency and product consistency.

[0027] In some embodiments, the energy storage battery further includes an explosion-proof pressure relief structure 10, which is located on at least one side of the main body 101 and is separate from the top cover. The explosion-proof pressure relief structure 10 is located on the narrow side of the main body 101 and is separated from the top cover to achieve thermal and electrical separation.

[0028] In this embodiment, the explosion-proof pressure relief structure 10 is located on the side of the main body 101 (especially the narrow side), separated from the top cover, achieving a thermoelectric separation design. When thermal runaway occurs in the cell, the internal pressure can be released directionally from the side, preventing high-temperature gas from passing through the terminal post area, thereby protecting the bonding interface of the tab-current collector-terminal post from high-temperature impact and reducing the risk of electrical connection failure due to pressure relief. At the same time, side pressure relief can be coordinated with the structural design of the battery module to guide the pressure relief channel uniformly to the outside of the module or a safe area, improving the safety level of the entire battery system.

[0029] The explosion-proof pressure relief structure 10 can be an integrally stamped explosion-proof groove (e.g., a cross-shaped, circular, or elliptical weak area machined on the narrow side of the housing), or it can be an independent explosion-proof valve assembly fixed to the side opening of the housing by welding, mounting, or riveting. The explosion-proof pressure relief structure 10 can be provided on only one narrow side of the main body 101, or it can be symmetrically provided on two narrow sides to increase the pressure relief area. In addition, a waterproof and breathable membrane or an explosion-proof valve patch 11 can be attached to the outside of the explosion-proof pressure relief structure 10 to prevent external moisture or dust from entering, without affecting the pressure relief function.

[0030] In some embodiments, such as Figure 4 and Figure 5 As shown, the current collector plate has multiple protrusions 501 on the side facing the all-pole lug core 4, and the number of protrusions 501 is the same as the number of all-pole lug cores 4. The positive and negative all-pole lugs are respectively annular, and a groove is formed in the center of the annulus. The protrusions 501 are used to insert into the annulus of the all-pole lug 15, and more preferably, the top of the protrusion 501 contacts the bottom of the groove formed by the all-pole lug 15.

[0031] The purpose of setting the protrusion 501 is as follows: First, by inserting the protrusion 501 into the annular interior of the tab 15, the contact area between the current collector and the tab 15 is significantly increased. Compared with the scheme of contact only on the end face, the side and top surfaces of the protrusion 501 participate in the contact and bonding with the tab 15, thereby increasing the bonding interface of the conductive adhesive and improving the bonding strength. Second, the larger contact area provides more electron flow channels, reduces contact resistance, is conducive to the transmission of large current, and improves the rate performance of the battery. Third, the contact between the protrusion 501 and the bottom of the groove provides axial positioning and support for the tab core 4, preventing the core from shifting during use and ensuring the long-term stability of the bonding interface.

[0032] In some embodiments, an outer insulating film 13 is also included, which is wrapped around the main body portion 101.

[0033] In some embodiments, core binding adhesive 14 is also included.

[0034] During formal production, n full-pole lug cores 4 with full-pole lug winding structure are bundled together with core binding adhesive 14, and then the lugs are bonded to the current collector with conductive structural adhesive; then the core is wrapped with insulation Mylar 12.

[0035] In some embodiments, the conductive adhesive is a multifunctional thermosetting / photosensitive hybrid conductive adhesive comprising a resin matrix, a conductive agent, and a curing agent.

[0036] The resin matrix is ​​selected from one or more of epoxy resins, phenolic resins, urea-formaldehyde resins, or unsaturated polyester resins.

[0037] The conductive agent is an inorganic-metal composite conductive agent, comprising metallic conductive materials and non-metallic conductive materials.

[0038] In some embodiments, the curing temperature can be adjusted to 100~120°C by reducing the proportion of curing agent or increasing inorganic fillers.

[0039] In some embodiments, the conductive adhesive further includes PTC ceramic powder with a positive temperature coefficient.

[0040] PTC ceramic powder exhibits low resistivity (e.g., resistivity <10 Ω·cm) at room temperature, having minimal impact on the overall conductivity of the conductive adhesive. However, when the temperature rises above its Curie point (typically designed within the range of 120℃ to 150℃), the resistance of the PTC material increases dramatically by 3 to 6 orders of magnitude. This characteristic stems from the grain boundary barrier mechanism of PTC ceramics: below the Curie point, the grain boundary barrier is low, allowing electrons to pass through easily; above the Curie point, the ferroelectric phase transforms into the paraelectric phase, the grain boundary barrier increases dramatically, and the resistance rises significantly.

[0041] When a battery experiences thermal runaway due to overcharging, short circuits, or external heating, the internal temperature of the cell gradually rises. When heat is conducted to the conductive adhesive layer, and the temperature of the adhesive layer exceeds the Curie point of the PTC ceramic powder, the internal resistance of the PTC material increases dramatically. Since the total resistance of the conductive adhesive layer is determined by the resistance of the resin matrix, the contact resistance of the conductive agent, and the resistance of the PTC material, this dramatic increase in the PTC material resistance causes the overall resistance of the conductive adhesive layer to rise by several orders of magnitude in a very short time (milliseconds to seconds). According to Joule's law, with the current remaining constant (because the external circuit is not yet disconnected), the power on the conductive adhesive layer (P=I0) will increase by several orders of magnitude. 2 The resistance (R) increases sharply with increasing resistance, generating a large amount of Joule heat. This Joule heat further raises the local temperature of the conductive adhesive, exceeding the thermal decomposition temperature of the resin matrix (typically 150℃~200℃). The resin matrix undergoes an irreversible thermal decomposition reaction, producing gas and carbonizing, which completely destroys the mechanical integrity of the conductive adhesive layer and the conductive pathway. The electrical connection between the tab and the terminal is automatically disconnected, and the internal circuitry of the battery is physically severed.

[0042] In a more specific scheme, the conductive adhesive composition ratio is: conductive agent: resin matrix: curing agent: additives (PTC ceramic powder and / or inorganic filler) = 70~80%: 10~15%: 3~5%: 0~1% In summary, to achieve better bonding results, this solution addresses the issues of low curing temperature (60℃) and long curing time (over 1 hour) of traditional two-component conductive adhesives. By optimizing the adhesive composition (reducing the proportion of hardener, increasing inorganic fillers, etc.), the curing temperature is adjusted to 100~120℃. Simultaneously, the original precious metal conductive agent (nano silver paste, conductivity 6.3×10⁷ S / m) is replaced with an inorganic-metal composite conductive agent (metallic materials: using nano copper powder, short fiber copper, etc., with conductivity of 3~6×10⁷ S / m; non-metallic materials: using CNTs, single-layer / multi-layer graphene, etc., with conductivity >10⁷ S / m). Furthermore, functional materials (such as PTC ceramic powder with a positive temperature coefficient) can be added to the conductive adhesive, utilizing its rapid increase in internal resistance at high temperatures to achieve active current shut-off of the conductive structure at high temperatures.

[0043] The newly developed specialized multifunctional thermosetting / photocurable hybrid conductive adhesive (such as epoxy, phenolic, urea-formaldehyde, and unsaturated polyester adhesives) sequentially bonds and fixes the tabs, base plate, and top cover at room temperature, and then polymerizes and fixes them under specific curing conditions (120℃ high temperature, UV light, etc.). This method offers advantages such as simple processing, high space utilization, no damage to the tabs, and no dust generation. Furthermore, in the event of thermal runaway and sustained temperature rise to 150-200℃, the PTC material's internal resistance rapidly increases, generating significant heat. Irreversible reactions such as rapid thermal decomposition of the curing agent cause the electrical connection between the tab and the terminal to fail, resulting in active circuit breaking of the battery cell and significantly improving battery product safety.

[0044] In some embodiments, an insulating Mylar 12 is also included, which wraps around the outside of the omnipolar lug 4 to insulate the omnipolar lug 4 from the integrated housing 1.

[0045] In this embodiment, an insulating Mylar 12 (polyester film) layer is wrapped around the outside of the full-tab core 4. This film has good mechanical strength, voltage resistance, and electrolyte corrosion resistance, and can completely isolate all outer surfaces of the core from the metal shell. Even if the core undergoes slight displacement or vibration within the shell, direct contact will not occur. Furthermore, the Mylar film has a certain thickness and stiffness, which can guide and protect the core during insertion into the shell, preventing scratch damage between the core's tabs or current collectors and the shell opening edges during insertion. Compared to solutions relying solely on diaphragm extension or insulating plates, the fully wrapped Mylar provides all-around insulation protection, making it particularly suitable for the full-tab 15 structure—because the full-tab 15 has a large end face area and more exposed metal, requiring higher insulation.

[0046] In some embodiments, an insulating bracket 9 is fixed to the inside of the top cover to protect the full electrode tab 15.

[0047] In some embodiments, the positive terminal and the negative terminal 3 are integrally formed on the two top cover portions, respectively.

[0048] In traditional batteries, the terminals are typically fixed to the top cover by riveting, pressing, or welding. These connection methods present risks of interfacial contact resistance, seal failure, and additional assembly steps. In this embodiment, the positive and negative terminals 3 are integrally formed with their corresponding top cover portions (e.g., through aluminum stamping, forging, or casting processes). There are no interfacial gaps between the terminals and the top cover, fundamentally eliminating the possibility of contact resistance and seal leakage. Since the terminals and the top cover are the same continuous metal body, there is no additional interfacial loss when current flows from the current collector through the terminals, helping to reduce the overall internal resistance of the battery. Simultaneously, the integrally formed structure eliminates the terminal assembly process, simplifying the manufacturing process and avoiding quality problems caused by poor riveting or welding defects. Especially in this invention, the first top cover portion 102 is integrally stamped with the main body portion 101, and the terminals are integrally formed with the first top cover portion 102. The entire integrated housing 1 (main body portion 101 + first top cover portion 102 + first terminal) can be manufactured as a single part, significantly reducing the number of parts and assembly tolerances. The second top cover 2 is integrally formed with the second pole post and then welded to the opening of the main body 101 (this welding can be done using ordinary welding or laser welding). It also has the advantages of reducing assembly errors and improving sealing reliability.

[0049] Example 2 The present invention also provides an assembly method for the energy storage battery as described above, wherein the positive electrode tab and the first current collector 5, the first current collector 5 and the positive electrode post, the negative electrode tab and the second current collector 6, and the second current collector 6 and the negative electrode post 3 are fixed and electrically connected by conductive adhesive.

[0050] In this embodiment, the assembly method completely replaces traditional welding with conductive adhesive bonding in the connection link of the tab-current collector-terminal. Therefore, the entire assembly process can be redesigned to achieve higher efficiency and lower cost. Furthermore, since welding is completely avoided in the assembly of components other than the second top cover 2, the assembly process can be carried out in a dust-free or low-dust environment, generating less metal dust and eliminating the need for subsequent battery cleaning or dust removal. Overall, this method has significant advantages in reducing equipment investment, shortening production cycles, and improving product safety and consistency.

[0051] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An energy storage battery, characterized in that, include: An integrated housing includes an integrally formed main body and a first top cover. The first top cover is integrally stamped during the forming process of the main body. The side of the main body opposite to the first top cover is open to form an opening. The second top cover is used to fix it at the opening of the integrated housing; The positive and negative terminals are located on the two top covers. At least one all-polar lug core is disposed within the main body portion, the all-polar lug core having an all-polar positive lug and an all-polar negative lug; The first and second collector plates are respectively disposed between the full-polarity ear core and the two top cover portions; Conductive adhesive is disposed between the positive electrode tab and the first current collector, between the first current collector and the positive electrode post, and between the negative electrode tab and the second current collector, and between the second current collector and the negative electrode post. After being cured by heat curing or light curing, the conductive adhesive fixes and electrically connects the positive electrode tab to the first current collector, the first current collector to the positive electrode post, the negative electrode tab to the second current collector, and the second current collector to the negative electrode post.

2. The energy storage battery according to claim 1, characterized in that: It also includes an explosion-proof pressure relief structure, which is located on at least one side of the main body and is separate from the top cover. The explosion-proof pressure relief structure is located on the narrow side of the main body and is separated from the top cover to achieve thermal and electrical separation.

3. The energy storage battery according to claim 1, characterized in that: The conductive adhesive is a multifunctional thermosetting hybrid conductive adhesive or a multifunctional photosensitive hybrid conductive adhesive, comprising a resin matrix, a conductive agent, and a curing agent.

4. The energy storage battery according to claim 3, characterized in that: The resin matrix is ​​selected from one or more of epoxy resins, phenolic resins, urea-formaldehyde resins, or unsaturated polyester resins.

5. The energy storage battery according to claim 3, characterized in that: The conductive agent is an inorganic-metal composite conductive agent, comprising metallic conductive materials and non-metallic conductive materials.

6. The energy storage battery according to claim 3, characterized in that: The conductive adhesive also includes PTC ceramic powder with a positive temperature coefficient.

7. The energy storage battery according to claim 1, characterized in that: It also includes insulating Mylar, which wraps around the outside of the omnipolar lug core to insulate the omnipolar lug core from the integrated housing.

8. The energy storage battery according to claim 1, characterized in that: An insulating bracket is fixed to the inside of the top cover to protect the full electrode tab.

9. The energy storage battery according to claim 1, characterized in that: The positive and negative terminals are integrally formed on the two top covers.

10. A method for assembling an energy storage battery according to any one of claims 1 to 9, characterized in that, The positive electrode tab is fixed and electrically connected to the first current collector, the first current collector is connected to the positive terminal, the negative electrode tab is connected to the second current collector, and the second current collector is connected to the negative terminal using conductive adhesive.

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