Cover assembly for energy storage battery and energy storage battery equipped with same

Abstract

A cap assembly for an energy storage battery includes a cap member having a cap circumferential portion extending in a circumferential direction and having a profile including a seal support protrusion extending in a radial direction; and a sealing member extending in a circumferential direction and having an annular shape and a profile including a first vertical sealing portion recessed in a radial direction, where the sealing support projection and the first vertical sealing portion are sealingly engaged with each other to prevent leakage of a fluid electrolyte.

Description

Technical Field

[0001] The present invention relates to a cover assembly for an energy storage battery and an energy storage battery equipped with the cover assembly. Background Technology

[0002] Various types of energy storage batteries, especially supercapacitors, generate heat during charging and discharging. These processes are typically managed by a management system. As charging and discharging proceed, a small amount of non-aqueous electrolyte may enter the gas phase due to the relatively low boiling point of commonly used electrolytes (e.g., <50°C). Summary of the Invention

[0003] The purpose of this invention is to improve leakage resistance.

[0004] This objective is achieved through the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

[0005] The present invention provides a current tab assembly for an energy storage battery, the assembly comprising: an energy storage component including a positive electrode having an active material, a negative electrode having an active material, and a separator disposed between the electrodes, wherein the energy storage component has a peripheral profile; and a current tab plate disposed in electrical contact with one electrode of the energy storage component, wherein the peripheral profile of the current tab plate corresponds to the peripheral profile of the energy storage component.

[0006] The present invention provides an energy storage battery configured for storing electrical energy, the battery comprising: a battery body having a top portion having a top opening; a cover member fastened to the top portion to close the top opening; and a preferred current tab assembly, wherein the energy storage assembly is housed within the battery body, and the current tab plate is disposed between the cover member and one of the electrodes of the energy storage assembly and is in electrical contact with the cover member and one of the electrodes of the energy storage assembly.

[0007] The energy storage module and current tabs can be pre-attached to each other or inserted separately into the battery body. The profile of the current tabs improves alignment with the energy storage module. Furthermore, the current tabs provide sufficient space for weld seams. The increased tolerances provided by the current tabs better accommodate inconsistencies in weld seam positioning, which overall allows for more repeatable manufacturing within given tolerances. Therefore, the reliability of large-scale manufacturing can be improved.

[0008] This invention provides a cover assembly for an energy storage battery, the assembly comprising:

[0009] - A cover member having a cover circumferential portion that extends in a circumferential direction and whose outline includes a sealing support protrusion extending in a radial direction; - A sealing member having an annular shape extending in a circumferential direction and its profile including a first vertical sealing portion recessed in a radial direction; The sealing support protrusion and the first vertical sealing portion are joined together in a sealing manner to prevent leakage of fluid electrolyte.

[0010] This invention provides an energy storage battery configured for storing electrical energy, the battery comprising: - Battery body, which has a top portion with a top opening; - A preferred cover assembly, wherein the cover member is fastened to the top portion to close the top opening; and - An energy storage component, which is housed within the battery body and electrically connected to the cover member and the battery body.

[0011] During charging / discharging, heat is generated within the energy storage battery. This heat can sometimes be sufficient to vaporize enough electrolyte, leading to an increase in pressure within the battery body. The cap and its seal form a labyrinthine structure that reliably prevents the electrolyte from escaping the battery body, regardless of its phase state.

[0012] This invention provides a battery body for an energy storage battery, the battery body comprising: - A top portion with a top opening; - The bottom part; and - The main body wall of the battery extends between the top and bottom sections. The bottom portion includes a thermal management structure configured to store and release heat, wherein the thermal management structure has at least one first type portion and at least one second type portion, and the first type portion has a larger heat capacity than the second type portion.

[0013] The present invention provides a cover member configured to be fastened to the top portion of the battery body of an energy storage battery. The cover member includes a cover portion on which a thermal management structure is formed, wherein the thermal management structure is configured to store heat and release heat, wherein the thermal management structure has at least one first type portion and at least one second type portion, and the first type portion has a larger heat capacity than the second type portion.

[0014] This invention provides a thermal management component, comprising: - Preferred battery body and / or preferred cover member; and - At least one current tab member, each current tab member having a terminal portion and at least one electrical contact portion configured to make conductive contact with an energy storage component when the current tab member is mounted. When the current electrode assembly is installed, the current electrode assembly is arranged between the bottom portion and the energy storage component and / or between the cover assembly and the energy storage component.

[0015] The present invention provides an energy storage battery configured for storing electrical energy, the battery comprising a preferred battery body or a preferred cover member and / or a preferred thermal management component.

[0016] This concept is based on increased thermal inertia. During normal operation, heat is generated when a battery charges or discharges. This heat is typically generated within the energy storage assembly and conducted towards the cover or bottom of the battery, where it can be dissipated through connected busbars or other external components. Increasing the localized heat capacity within the battery acts as an intermediate reservoir, enabling more efficient removal of heat from the energy storage assembly and thus reducing the risk of thermal damage. In the event of thermal runaway, the thermal management structure can absorb a significant amount of heat, which is then further dissipated using external measures such as cooling and busbars. Therefore, the typically exponentially accelerating thermal runaway process, especially in its initial stages, can be mitigated, buying valuable time for countermeasures such as emergency discharge.

[0017] Preferably, the current tab plate includes a plate body portion and a plate outer peripheral portion. Preferably, the plate outer peripheral portion has a greater thickness than the plate body portion and / or protrudes vertically from the plate body portion. The plate body portion can make two-dimensional contact with the energy storage assembly. The plate outer peripheral portion is located radially outward and can be directly connected to the cover member and the energy storage assembly. The resistivity can be reduced in the more radially outward region. This allows the radially outer region of the energy storage assembly to be electrically connected with lower resistivity, thereby reducing ohmic heating, and this radially outer region typically stores more energy than the radially inner region.

[0018] Preferably, the current tab plate includes at least one venting slit and / or a central opening formed in the center of the current tab plate. The venting slit extends from the center of the current tab plate toward the outer periphery of the plate, or extends parallel to the outer periphery of the plate at a certain distance. The venting slit allows vaporized electrolyte to pass through the current tab plate. This allows for a reduction in the total pressure within the battery body or convective heat transfer toward the top or bottom of the battery. Therefore, better heat distribution or enhanced cooling can be achieved. The central opening allows for the same effect and also facilitates the filling of the battery body with electrolyte during manufacturing.

[0019] Preferably, the outer peripheral portion of the plate and / or the outer body portion directly adjacent to the outer peripheral portion of the plate extends along the entire circumference of the current electrode plate and is formed continuously without interruption. These portions can form annular contact surfaces capable of collecting current from the entire periphery of the energy storage assembly.

[0020] Preferably, the inner body portion, formed directly adjacent to the vent slit and / or central opening, extends circumferentially and is formed continuously without interruption. This portion may form an annular contact surface capable of collecting current from the entire inner circumference of the energy storage assembly.

[0021] Preferably, the current tab includes a hub formed at the center of the current tab, wherein the hub protrudes from the current tab (preferably from the body portion) along the normal direction. With this configuration, the current tab can substantially conform to the shape of the battery body along its bottom. This increases the contact area, thereby reducing resistivity.

[0022] Preferably, the hub includes a hub recess extending along the normal direction. This recess provides a small amount of additional expansion space for the electrolyte.

[0023] Preferably, the energy storage battery further includes a second current tab. Preferably, the battery body has a bottom portion disposed opposite to the top portion, and the second current tab is arranged to make electrical contact with the bottom portion and another electrode of the energy storage assembly. The current tab can be arranged at the top with a cover member, or at the bottom with a closed bottom portion of the battery body.

[0024] Preferably, the cover member and / or the bottom portion has an inner circumferential contact surface arranged to make electrical contact with the inner body portion. Preferably, the cover member and / or the bottom portion has an outer circumferential contact surface arranged to make electrical contact with the outer body portion and / or the outer circumferential portion of the plate. The circumferential contact surface can be pressed downward onto the current electrode member and form a reliable electrical contact with the current electrode member. The contact surface can be welded to the current electrode member.

[0025] Preferably, the cover member and / or bottom portion includes an expansion recess that defines an expansion chamber between the current tab plate and the cover member and / or bottom portion. The recess provides additional containment space for vaporized electrolyte, thus reducing pressure within the battery. Furthermore, the electrolyte may condense on cooler components and flow back, enabling additional convective cooling.

[0026] Preferably, the cover member includes a central hub portion, and the central hub portion includes at least one fluid channel. Although the central hub portion may typically obstruct fluid communication, the fluid channel allows vaporized electrolyte to flow radially from the center outwards and vice versa.

[0027] Preferably, the cover member includes a central filling opening, which is closed by a flexible first plug inserted into the opening to press against its inner circumference, and the flexible plug is in fluid communication with the interior of the battery body. The flexible first plug ensures a tight seal of the electrolyte. Furthermore, a material resistant to electrolyte vapors can be selected. Additionally, materials can be selected to avoid contaminating the electrolyte. Since welding is not required, the plug allows for controlled filling and subsequent sealing of the center of the battery body.

[0028] Preferably, the cover member includes a second plug made of a material weldable to the cover member, and the second plug prevents the first plug from having fluid communication with the outside of the battery body. The second plug can reliably isolate the battery interior from the environment.

[0029] Preferably, the circumferential portion of the cover includes a vertical sealing surface extending axially downward from the sealing support protrusion. Preferably, the sealing member includes a second vertical sealing portion extending axially downward from the first vertical sealing portion and abutting against the vertical sealing surface to form a seal. In addition to a reliable labyrinthine structure, the vertical seal formed here is sufficient to prevent electrolyte vapor from reaching this sealing location. Furthermore, the vertical seal electrically insulates the cover member from the battery.

[0030] Preferably, the circumferential portion of the cover includes a horizontal sealing surface extending radially inward from the sealing support protrusion. Preferably, the sealing member includes a horizontal sealing portion extending radially inward from the first vertical sealing portion and abutting against the horizontal sealing surface to form a seal. The horizontal seal effectively prevents substances from entering the battery and also electrically insulates the cover member from the curled portion.

[0031] Preferably, the cover member includes a plate-shaped cover body portion disposed adjacent to the circumferential cover portion. Preferably, the cover body portion has a circumferential sealing surface extending in an axial direction. Preferably, the profile of the sealing member includes a third vertical sealing portion extending axially upward from the horizontal sealing portion and abutting against the circumferential sealing surface to form a seal. This seal provides possible support for the manifold and prevents foreign objects from entering the area where the manifold is typically connected.

[0032] Preferably, the cover assembly further includes a current tab plate in direct electrical contact with the cover member. The current tab plate collects current with a resistivity that may be lower than that of the cover member itself.

[0033] Preferably, the current electrode plate includes a plate body portion and a peripheral portion, wherein the peripheral portion has a greater thickness than the plate body portion or protrudes vertically from the plate body portion. Preferably, the peripheral portion is in direct electrical contact with the circumferential portion of the cover. The thickness or protrusion of the peripheral portion allows it to have more conductive material or increase surface contact with the cover member, thereby reducing resistivity.

[0034] Preferably, the cover assembly further includes a top portion of the battery body of the energy storage battery, the top portion including a top-formed portion that presses the sealing member against the cover member to form a seal. The sealing member is pressed against the cover member to secure the cover member in place and effectively seal the battery body.

[0035] Preferably, the top molding portion includes a top seal portion that presses the vertical sealing portion against the vertical sealing surface to form a seal. The beaded portion can radially press the cover member inward, thereby positioning it near the center. This arrangement has small tolerances and is repeatable, thus reducing variations between batteries during production. Combined with other features of the cover, this also ensures reliable electrical contact between the cover member and the current tab plate.

[0036] Preferably, the top forming portion includes a top curled portion that presses the horizontal sealing portion against the horizontal sealing surface to form a seal. The curled portion can secure the cover member at the top.

[0037] Preferably, when the energy storage component is installed, the first type portion is formed to be in thermal contact with the energy storage component. Preferably, when the energy storage component is installed, the second type portion is not in direct contact with the energy storage component. The first type portion can initially receive heat and redistribute it to the second type portion. Because the second type portion is not in contact with the heat-generating element, a cooling effect is achieved.

[0038] Preferably, the thermal management structure, particularly a first-type portion, includes a thermal contact surface that forms thermal contact with the energy storage component when the energy storage component is installed. The energy storage component, especially the transition region from the electrodes to the current tabs and then to the battery body or cover member, is a typical location for heat generation. Therefore, direct contact with the first-type portion can transfer heat away from where heat would normally be generated.

[0039] Preferably, the first type portion has a greater material thickness than the second type portion. This is one way to increase heat capacity.

[0040] Preferably, the thermal management structure includes a thermal contact member formed to project from a bottom portion toward a top portion, and / or formed to project from a body portion. Preferably, the thermal contact member includes a contact wall and at least one sidewall forming a first-type portion. The thermal contact member typically has a contact wall that directly contacts the heat source and one or more sidewalls that facilitate heat reception. The sidewalls are typically integrally formed with the contact wall. The sidewalls are preferably formed such that they do not contact the heat source, thus allowing heat to be carried away from the contact wall.

[0041] Preferably, the thermal management structure includes a receiving tank with a receiving tank bottom, and when the energy storage component is installed, the receiving tank bottom and the energy storage component define a receiving space between them. This space can accommodate longitudinally shaped components, facilitating the radial transfer of heat from the center outwards.

[0042] Preferably, the receiving tank, especially the bottom of the receiving tank, forms the second part. This tank is spaced apart from the heat source to better distribute the heat.

[0043] Preferably, the thermal contact member, more preferably a contact wall, has a thermal contact surface thereon. The thermal contact surface can be improved by appropriate surface processing, coating or other means.

[0044] Preferably, the current tab member is configured as a legged current tab member, and preferably is integrally formed as a single integral component. The legged current tab member can be manufactured to fit into a receiving groove.

[0045] Preferably, the current tab member includes a plurality of contact legs projecting radially from the terminal portion. The terminal portion is typically located centrally, and the contact legs project from the center in a star-shaped pattern. The member is typically configured to mate with a receiving groove.

[0046] Preferably, the terminal portion is formed as a heat dissipation portion, gradually narrowing from the electrical contact portion toward the terminal portion. In addition to simple electrical connection, the terminal portion can also have additional heat capacity, for example, by increasing the amount or thickness of material, thus acting as a heat sink.

[0047] Preferably, the electrical contact portion includes a heat-conducting leg portion that protrudes from the heat dissipation portion along the electrical contact portion. Thermal conduction can be further increased by adding an additional leg portion with higher thermal conductivity, for example by increasing its thickness, which allows heat to be efficiently transferred radially outward from the terminal portion along the leg. Attached Figure Description

[0048] Embodiments of the invention will be described in more detail with reference to the illustrative drawings listed below. Although the invention is described in detail with reference to a cylindrical battery, it should be noted that the invention can also be applied to other typical shapes.

[0049] Figure 1 A longitudinal cross-sectional view of the energy storage battery is depicted; Figure 2 Depicting Figure 1 The upper part of the energy storage battery; Figure 3 and Figure 4 A perspective view of the cover component is depicted; Figure 5 A perspective view of the current electrode plate is depicted; Figure 6 Depicting Figure 1 The lower part of the energy storage battery; Figure 7 Depicting Figure 6 Variations of the lower part; Figure 8 and Figure 9 A perspective view of a legged current electrode assembly is depicted. Figure 10 A longitudinal cross-sectional view of the energy storage battery is depicted; Figure 11 Depicting Figure 10 A perspective view of the lower part; Figures 12 to 14 Depicting Figure 11 The longitudinal cross-section of the lower part; Figure 15 Depicting Figure 11 A cross-sectional view of the lower part; Figure 16 Depicting Figure 11 Variations of the lower part; Figure 17 Depicting Figure 10 A perspective view of the cover component of the energy storage battery; and Figure 18 Depicting from Figure 17 A perspective view of the bottom of the cover component. Detailed Implementation

[0050] refer to Figure 1 The energy storage battery 1 is shown in a longitudinal cross-section. The energy storage battery 1 is configured for storing electrical energy. The energy storage battery 1 is preferably configured as a supercapacitor.

[0051] The energy storage battery 1 includes an energy storage component 11. The energy storage component 11 is configured to store electrical energy. The energy storage component 11 includes a positive electrode and a negative electrode. Each electrode includes an active material. The electrode and the active material are separated from each other by a separator. The electrode is typically made of a metal substrate, such as aluminum foil. The active material is disposed on the aluminum foil. The active material is preferably a microporous carbon material, which may have various additives, which are known and will not be described here. The energy storage component 11 is typically manufactured by stacking and winding a positive electrode with active material, a separator, and a negative electrode with active material into a cylindrical element. Such an element is sometimes referred to as a "jelly roll". The energy storage component 11 is wetted using a non-aqueous electrolyte, preferably through an internal channel 12. The internal channel 12 extends from one end of the energy storage component 12 to the other end.

[0052] The energy storage battery 1 includes a battery body 2. Although other shapes are possible, the battery body 2 is preferably formed in a generally cylindrical shape. The battery body 2 can be made from a metal sheet or small metal rod by stamping, deep drawing or other forming techniques.

[0053] The battery body 2 has a top portion 21. The top portion 21 has a top opening 22. The top opening 22 allows access to the battery body 2. The top opening 22 can be closed by a cover. The top portion 21 generally extends upward from the upper end of the energy storage assembly 11 along the axial direction of the battery body 2.

[0054] The battery body 2 has a bottom portion 23 opposite to the top portion 21. The bottom portion 23 may be completely closed or mostly closed and has a bottom opening 24. The bottom opening 24 is preferably positioned such that the internal channel 12 and the bottom opening 24 are aligned in the axial direction. The bottom portion 23 extends downward in the axial direction from the lower end height of the energy storage assembly 11.

[0055] The battery body 2 has a battery body wall 25. The battery body wall 25 extends axially between the top portion 21 and the bottom portion 23. The battery body wall 25 may include a plurality of bead-shaped portions 251. The bead-shaped portions 251 help increase the stability of the battery body 2, or can be used to position and support the energy storage assembly 11.

[0056] The battery body 2 has a battery interior 26 that can be separated from the exterior of the battery body 2. The battery interior 26 is preferably defined by a closed top portion 21 and / or a closed bottom portion 23 and / or a battery body wall 25.

[0057] refer to Figure 2 The cover assembly 3 that closes the top portion 21 is shown.

[0058] Cover assembly 3 includes cover member 31, which also Figure 3 and Figure 4As shown in the figure. The cover member 31 is formed to match the top opening 22 and the battery body 2, and is adapted to close the top opening 22. The cover member 31 is generally disc-shaped.

[0059] The cover member 31 includes a cover body portion 32. The cover body portion 32 is typically a thin, disc-shaped portion from which other components can protrude.

[0060] The cover member 31 includes a circumferential portion 33. The circumferential portion 33 protrudes downward in the axial direction at the outer edge of the cover body portion 32. The circumferential portion 33 extends in the circumferential direction of the cover body portion 32. The circumferential portion 33 is preferably annular. The circumferential portion 33 preferably has a greater material thickness than the cover body portion 32 in the axial and / or radial directions.

[0061] The circumferential portion 33 of the cover includes a circumferential sealing surface 331. The circumferential sealing surface 331 extends in the circumferential direction. The circumferential sealing surface 331 faces the battery body 2.

[0062] The circumferential portion 33 of the cover includes a sealing support protrusion 332. The sealing support protrusion 332 projects radially outward from the circumferential portion 33 of the cover. The sealing support protrusion 332 preferably extends along the entire circumference of the cover member 31.

[0063] The circumferential portion 33 of the cover includes a vertical sealing surface 333. The vertical sealing surface 333 extends axially downward from the sealing support protrusion 332. The vertical sealing surface 333 faces the battery body 2.

[0064] The circumferential portion 33 of the cover includes a horizontal sealing surface 334. The horizontal sealing surface 334 extends radially inward from the sealing support protrusion 332.

[0065] The cover member 31 includes a central hub portion 34. The central hub portion 34 protrudes axially from the cover body portion 32. The central hub portion 34 can be used as a terminal for connecting a busbar to the energy storage battery 1. The central hub portion 34 can also extend into the battery and protrude toward the energy storage assembly 11.

[0066] The central hub portion 34 includes a central filling opening 341. The central filling opening 341 is adapted to allow the electrolyte to pass through, thereby injecting the electrolyte into the battery interior 26.

[0067] The central hub portion 34 includes a first plug 342. The first plug 342 is made flexible so that it can be pressed into the central filling opening 341. For example, the first plug 342 may be made of an elastomer. The first plug 342 is secured in place by press fitting. The first plug 342 has a generally cylindrical shape and may have a tapered portion to facilitate insertion of the first plug 342 into the central filling opening 341. The first plug 342 is exposed to and fluidly connected to the battery interior 26.

[0068] The central hub portion 34 includes a second plug 343. The second plug 343 is manufactured to be weldable to the cap member 31. The second plug 343 may be made of metal, such as aluminum. The second plug 343 completely covers and closes the top opening 22. The second plug 343 is generally disc-shaped with an annular edge. The second plug 343 is preferably welded to the cap member 31 via the annular edge.

[0069] The cover member 31 includes an expansion recess 35. The expansion recess 35 may be formed as an asymmetrical groove. The expansion recess 35 is preferably surrounded by a cover body portion 32 that can form the bottom of the groove, a cover circumferential portion 33 that can form a radial outer wall, and a central hub portion 34 that can form a radial inner wall.

[0070] The central hub portion 34 includes multiple fluid channels 344. Each fluid channel 344 fluidly connects the expansion recess 35 to the central filling opening 341. The expansion recess 35 and the current electrode member 51 can form an expansion chamber 6 into which the vaporized electrolyte can expand.

[0071] The cover member 31 includes an inner peripheral contact surface 36. The inner peripheral contact surface 36 has a generally annular shape. The inner peripheral contact surface 36 faces the battery interior 26. The inner peripheral contact surface 36 is in direct contact with the current tab assembly 5 to collect current. The inner peripheral contact surface 36 is disposed on the central hub portion 34.

[0072] The cover member 31 includes an outer peripheral contact surface 37. The outer peripheral contact surface 37 faces the battery interior 26 and the battery body wall 25. The outer peripheral contact surface 37 is formed on the circumferential portion 33 of the cover and preferably abuts the circumferential sealing surface 331 of the cover.

[0073] The outer peripheral contact surface 37 includes an outer horizontal contact surface 371, which is disposed on the lower surface of the circumferential portion 33 of the cover. The outer horizontal contact surface 371 faces the battery interior 26 and toward the bottom portion 23. The outer horizontal contact surface 371 is in direct contact with the current tab assembly 5.

[0074] The outer peripheral contact surface 37 includes an outer vertical contact surface 372, which is disposed on the circumferential surface of the cover circumferential portion 33. The outer vertical contact surface 372 extends radially outward toward the battery body wall 25. The outer vertical contact surface 371 is in direct contact with the current tab assembly 5.

[0075] Return to reference Figure 1 and Figure 2 The energy storage battery 1 includes a sealing member 4. The sealing member 4 is made of an electrically insulating material. The sealing member 4 is preferably made of an elastomer and shaped to fit the cover assembly 3. Specifically, the sealing member 4 is configured to form a seal against the top portion 21 and the cover assembly 31. The sealing member 4 is preferably annular.

[0076] The sealing member 4 includes a first vertical sealing portion 41. The vertical sealing portion 41 is formed to be supported by a sealing support protrusion 332. The first vertical sealing portion 41 includes a sealing groove 411 that matches the sealing support protrusion 332. The first vertical sealing portion 41 is shaped to form a labyrinthine sealing structure.

[0077] The sealing member 4 includes a second vertical sealing portion 42. The second vertical sealing portion 42 is formed adjacent to the first vertical sealing portion 41. The second vertical sealing portion 42 protrudes axially downward from the first vertical sealing portion 41.

[0078] The second vertical sealing portion 42 includes an outer vertical sealing portion 421 that faces radially outward and preferably contacts the top forming portion 27, specifically the top caulking sealing portion 271.

[0079] The second vertical sealing portion 42 includes an inner vertical sealing portion 422, which faces radially inward and preferably contacts the vertical sealing surface 333.

[0080] The second vertical sealing portion 42 includes a vertical end 423 that protrudes axially downward and does not contact the battery body 2, the cover member 31, and the current tab assembly 5.

[0081] The sealing member 4 includes a horizontal sealing portion 43 formed adjacent to the first vertical sealing portion 41. The horizontal sealing portion 43 protrudes radially inward from the first vertical sealing portion 41. The horizontal sealing portion 43 preferably contacts the horizontal sealing surface 334.

[0082] The horizontal sealing portion 43 includes an upper horizontal sealing portion 431 that faces outward in the axial direction and is preferably in direct contact with the top portion 21, and preferably in direct contact with the top curled portion 272.

[0083] The horizontal sealing portion 43 includes a lower horizontal sealing portion 432, which faces the axially downward side and preferably directly contacts the circumferential portion 33 of the cover member, and preferably directly contacts the horizontal sealing surface 334.

[0084] The sealing member 4 includes a third vertical sealing portion 44. The third vertical sealing portion 44 is formed adjacent to the horizontal sealing portion 43. The third vertical sealing portion 44 protrudes axially upward from the horizontal sealing portion 43. The third vertical sealing portion 44 can abut against the central hub portion 34 to form a seal. The third vertical sealing portion 44 can serve as a support for the manifold installed on the central hub portion 34.

[0085] refer to Figure 2and Figure 5 The current tab assembly 5 is described in more detail. The current tab assembly 5 may include at least one current tab member 51. The current tab member 51 is configured for current harvesting and is in electrical contact with the energy storage assembly 11.

[0086] The current tab member 51 can be configured as a current tab plate 510. The current tab plate 510 is basically a thin plate-shaped member made of a conductive material, such as an aluminum sheet. The current tab plate 510 is typically a disc-shaped member.

[0087] The current electrode plate 510 includes a plate body portion 511. The plate body portion 511 is a portion of uniform thickness and is essentially a disk.

[0088] The current tab plate 510 includes an outer peripheral portion 512. The outer peripheral portion 512 may be formed to be thicker than the main body portion 511, or it may be formed by bending the outer edge of the current tab plate 510 upwards. Therefore, the outer peripheral portion 512 has a greater thickness in the axial direction compared to the main body portion 511. The outer peripheral portion 512 extends around the entire circumference of the current tab plate 510. The outer peripheral portion 512 is formed at the outermost edge of the current tab plate 510.

[0089] The plate portion 511 may include a central opening 513 formed therein.

[0090] The plate portion 511 may include an outer body portion 514. The outer body portion 514 is formed adjacent to the outer peripheral portion 512 of the plate. The outer body portion 514 extends circumferentially in the circumferential direction and has a small width. The outer body portion 514 extends in the circumferential direction without interruption.

[0091] The plate portion 511 may include an inner body portion 515. The inner body portion 515 is formed near the central opening 513 of the plate. The inner body portion 515 extends circumferentially in the circumferential direction and has a small width. The inner body portion 515 extends circumferentially without interruption.

[0092] The current electrode plate 510 may include a plurality of vent slots 516. The vent slots 516 extend radially and may be formed between the inner body portion 515 and the outer body portion 514.

[0093] Reference Figure 6 The current electrode plate 510 may include a hub 517 projecting downward from the plate body portion 511. The hub 517 is formed to fit a bottom opening 24. The hub 517 is welded to the bottom portion 23 through the bottom opening 24.

[0094] The current tab plate 518 may include a hub recess 518. The hub recess 518 is formed in the center and faces the interior 26 of the battery.

[0095] Reference Figures 7 to 9 The current tab member 51 can be configured as a legged current tab member 520. The legged current tab member 520 may include a terminal portion 521. The terminal portion 521 is formed centrally and projects axially to allow insertion of an opening, such as a bottom opening 24. The legged current tab member 520 may include a heat dissipation portion 522 formed on the terminal portion 521. The heat dissipation portion 522 may be configured as a tapered heat dissipation portion 523 that gradually narrows toward the terminal portion 521.

[0096] The legged current tab member 520 includes a plurality of contact legs 526. Each contact leg 526 protrudes radially outward from the terminal portion 521. The contact legs 526 are preferably distributed in a circumferential direction to form a star pattern.

[0097] Each contact leg 526 includes a tab welding portion 527 welded to the energy storage assembly 11. The tab welding portion 527 is preferably formed as a tab welding groove 528.

[0098] The heat dissipation portion 522 may include a notch that extends radially and transitions continuously to the tab welding groove 528.

[0099] The legged current tab assembly 520 may include a plurality of thermally conductive leg portions 525 extending onto the edge portion of each contact leg 526. Each thermally conductive leg portion 525 has a greater thickness than the tab welding portion 527. The thermally conductive leg portions 525 may form the sidewalls of the tab welding groove 528.

[0100] The heat dissipation portion 522, preferably a tapered heat dissipation portion 523, is formed to continuously transition to the heat-conducting leg portion 525 in the radial direction.

[0101] The legged current tab member 520 may include a plurality of recesses 529 formed on opposite sides of the terminal portion 521. The recesses 529 extend radially and provide fluid passages for the electrolyte. The recesses 529 may be formed in a star pattern and / or preferably formed between two adjacent contact legs 526.

[0102] The assembly of the energy storage battery 1 is performed as follows: a battery body 2 without a top forming portion 27 is provided; the two ends of the energy storage component 11 are welded to current tab members 51 respectively; a suitable current tab member 51 is selected according to the corresponding cover member 31 and bottom portion 24; the energy storage component 11 with the current tab member 51 is inserted into the battery interior 26; the bead-shaped portion 251 helps to position the energy storage component 11; a sealing member 4 is placed on the cover member 31 and held in place by a sealing support portion 332; the cover member 31 and the sealing member 4 are placed on the current tab member 51; the top portion 21 is filled and crimped to fasten the cover member 31 to the battery body 2, wherein the sealing member 4 provides electrical insulation therebetween; electrolyte is filled through the central filling opening 341, and then the first plug 342 is inserted into the central filling opening 341 by press fitting and the second plug 343 is welded in place to seal the battery.

[0103] refer to Figures 10 to 17 Another embodiment of the energy storage battery 1 is described, and its differences from the previously described embodiment are explained.

[0104] refer to Figure 10 The energy storage battery 1 has a thermal management component 7 formed on each end of the energy storage battery 1.

[0105] refer to Figures 11 to 15 The bottom portion 23 is described in more detail below. The thermal management assembly 7 includes a thermal management structure 70. The thermal management structure 70 is formed in the bottom portion 23. The thermal management structure 70 is configured to perform heat conduction and heat storage.

[0106] The thermal management structure 70 includes a first type portion 71. The first type portion 71 is in direct contact with the energy storage component 11. The first type portion 71 may have a thermal contact surface 711 that is in direct contact with the energy storage component 11. The thermal contact surface 711 may be prepared, for example, by a suitable coating or surface treatment to obtain better thermal conductivity. The first type portion 71 is typically formed with a larger heat capacity than adjacent portions. Compared to adjacent portions, the first type portion 71 has a greater thickness in the axial direction, which allows for a larger heat capacity.

[0107] The thermal management structure 70 includes a second type portion 72. The second type portion 72 is not in direct contact with the energy storage component 11. The second type portion 72 is spaced apart from the energy storage component 11 in the axial direction. Compared to the first type portion 71, the second type portion 72 typically has a smaller heat capacity. Compared to the first type portion 71, the second type portion 72 has a smaller thickness in the axial direction.

[0108] The thermal management structure 70 may include a plurality of thermal contact members 73. The thermal contact members 73 may be formed in the bottom portion 23. The thermal contact members 73 protrude upward from the bottom portion 23 and are in direct contact with the energy storage assembly 11.

[0109] The thermal contact member 73 includes a contact wall 731 that is in direct contact with the energy storage assembly 11. The contact wall 731 extends horizontally. The contact wall 731 has a triangular profile. The contact wall 731 extends radially inward from the battery body wall 25. The contact wall 731 forms a first type portion 71.

[0110] The thermal contact member 73 includes a sidewall 732 adjacent to the contact wall 731. The sidewall 732 extends vertically. The sidewall 732 has a quadrilateral profile. The sidewall 732 extends axially downward from the contact wall 731. The sidewall 732 together with the contact wall 731 forms a first type portion 71.

[0111] Two adjacent thermal contact members 73 may define a receiving groove 74 between them. The receiving groove 74 extends radially. The receiving groove 74 is configured to receive a legged current tab member 520, specifically a contact leg 526.

[0112] The receiving slot 74 includes a receiving slot bottom 741. The receiving slot bottom 741 does not directly contact the energy storage component. The receiving slot bottom 741 extends horizontally. The receiving slot bottom 741 has a trapezoidal profile. The receiving slot bottom 741 gradually narrows inward from the battery body wall. The receiving slot bottom 741 forms a second type portion 72.

[0113] The receiving groove 74 includes a receiving groove sidewall 742. The receiving groove sidewall 742 is formed by a thermal contact member 73, specifically formed by the sidewall 732.

[0114] The thermal management structure 70 includes a receiving space 75 for the legged current tab member 520, the receiving space 75 being defined between the receiving tank 74 and the energy storage component 11.

[0115] Reference Figure 14 and Figure 15 The legged current tab member 520 is inserted, causing the contact leg 526 to extend radially into the receiving space 75. The space between either side of the contact leg 526 and the adjacent receiving groove sidewall 742 gradually narrows radially inward, so that the gap near the center is narrower than the gap near the radially outward.

[0116] like Figure 15 As shown, the heat dissipation portion 522 can also be in thermal contact with the first type portion 72, especially with the side wall 732.

[0117] Reference Figure 16The legged current tab member 520 and the thermal management structure 70 (e.g., thermal contact member 73) are formed such that the gap between them remains a constant width in the radial direction.

[0118] Reference Figure 17 and Figure 18 The thermal management assembly 7 includes a cover member 31. A thermal management structure 70 is formed in the cover member 31, and the construction of the thermal management structure 70 is substantially the same as described above.

[0119] During operation, heat is generated by the energy storage component 11. Heat is conducted to the top portion 21 and the bottom portion 23 via the current tab member 51. The thermal management structure 70, particularly the first type portion 71, has a large heat capacity and can act as a heat sink and store heat. Alone or in combination with the legged current tab member 520, it can create considerable thermal inertia, significantly reducing the thermal load on the energy storage component 11 and thus increasing its lifespan. In the event of thermal runaway, the additional thermal inertia can reduce the risk of damage to other energy storage cells.

[0120] List of reference numerals in the attached diagram: 1. Energy storage battery; 11 energy storage components; 12 internal passageways; 2. Battery body; 21. Top section; 22. Top opening; 23. Bottom section; 24. Bottom opening; 25 battery main body wall; 251 bead-like portion; 26 battery internals; 27. Top molding section; 271 Top sealant section; 272 Top curled section; 3-cover component; 31. Cover components; 32. Cover portion; 33. Cover the circumferential portion; 331 covers the circumferential sealing surface; 332 sealing support protrusion; 333 Vertical sealing surface; 334 horizontal sealing surface; 34. Center hub section; 341 Central filling opening; 342 First stopper; 343 Second stopper; 344 fluid channels; 35 Expansion recess; 36 inner peripheral contact surface; 37 Peripheral contact surface; 371 outer horizontal contact surface; 372 outer vertical contact surface; 4. Sealing components; 41 First vertical sealing section; 411 Sealing groove; 42 Second vertical sealing section; 421 External vertical sealing section; 422 Internal vertical sealing section; 423 Vertical end; 43. Horizontal sealing section; 431 Upper horizontal sealing section; 432 Lower horizontal sealing section; 44. Third vertical sealing section; 5. Current tab assembly; 51 Current electrode assembly; 510 current tab plate; 511 plate body section; 512 outer perimeter; 513 board with a central opening; 514 External main body; 515 main body; 516 ventilation seam; 517 steel plate hub; 518 hub concave part; 520 current electrode assembly with legs; 521 terminal section; 522 heat dissipation section; 523 cone-shaped heat dissipation section; 524 notch; 525 heat-conducting leg section; 526 contact leg; 527 electrode tab welding part; 528 electrode tab welding groove; 529 groove; 6 expansion chambers; 7 thermal management components; 70 thermal management structure; 71. First type part; 711 thermal contact surface; 72. Second type part; 73 Thermal contact components; 731 contact wall; 732 sidewall; 74 receiving slots; 741 Bottom of the receiving tank; 742 Sidewall of the receiving tank; 75 cubic meters of space.

Claims

1. A cover assembly for an energy storage battery, the assembly comprising: - A cover member having a circumferential portion extending in a circumferential direction and having a profile including a sealing support protrusion extending in a radial direction; - A sealing member having an annular shape extending in a circumferential direction, and its outline including a first vertical sealing portion recessed radially. The sealing support protrusion and the first vertical sealing portion are engaged with each other in a sealing manner to prevent leakage of fluid electrolyte.

2. The cover assembly according to claim 1, wherein, The circumferential portion of the cover has a profile including a vertical sealing surface extending downward in the axial direction from the sealing support protrusion, and the sealing member has a profile including a second vertical sealing portion extending downward in the axial direction from the first vertical sealing portion and abutting against the vertical sealing surface to form a seal.

3. The cover assembly according to any one of the preceding claims, wherein, The circumferential portion of the cover has a profile including a horizontal sealing surface extending radially inward from the sealing support protrusion, and the sealing member has a profile including a horizontal sealing portion extending radially inward from the first vertical sealing portion and abutting against the horizontal sealing surface to form a seal.

4. The cover assembly according to claim 3, wherein, The cover member includes a plate-shaped cover body portion disposed adjacent to the circumferential portion of the cover, wherein the cover body portion has a circumferential sealing surface extending in an axial direction, and the outline of the sealing member includes a third vertical sealing portion extending upward in an axial direction from the horizontal sealing portion and abutting against the circumferential sealing surface of the cover to form a seal.

5. The cover assembly according to any one of the preceding claims further includes a current electrode plate that is in direct electrical contact with the cover member.

6. The cover assembly according to claim 5, wherein, The current electrode plate includes a plate body portion and a plate outer periphery portion, wherein the plate outer periphery portion has a greater thickness than the plate body portion or protrudes vertically from the plate body portion, and the plate outer periphery portion is in direct electrical contact with the circumferential portion of the cover.

7. The cover assembly according to claim 5 or 6, wherein, The current electrode plate includes at least one venting slit and / or a central opening formed in the center of the current electrode plate. The venting slit extends from the center of the current electrode plate toward the outer periphery of the plate, or extends parallel to the outer periphery of the plate, and there is a certain distance between them.

8. The cover assembly according to claim 7, wherein, The outer peripheral portion of the plate and / or the outer main body portion directly adjacent to the outer peripheral portion of the plate extends along the entire circumference of the current electrode plate, and the extension is continuously formed without interruption; and / or wherein, The inner body portion, which is directly adjacent to the venting slit and / or the central opening, extends in a circumferential direction, and the extension is continuous and uninterrupted.

9. The cover assembly according to any one of the preceding claims, wherein, The cover member has an inner circumferential contact surface, the inner circumferential contact surface being arranged to make direct electrical contact with the inner body portion; and / or wherein... The cover member has an outer peripheral contact surface, which is arranged to make direct electrical contact with the outer body portion and / or the outer peripheral portion of the plate.

10. The cover assembly according to any one of claims 5 to 9, wherein, The cover member includes an expansion recess that defines an expansion chamber between the current electrode plate and the cover member.

11. The cover assembly according to any one of the preceding claims further includes a top portion of the battery body of the energy storage battery, the top portion including a top-formed portion that presses the sealing member against the cover member to form a seal.

12. The cover assembly according to claim 11, wherein, The top molding portion includes a top sealant portion that presses the vertical sealing portion against the vertical sealing surface to form a seal; and / or wherein... The top forming portion includes a top curled portion that presses the horizontal sealing portion against the horizontal sealing surface to form a seal.

13. An energy storage battery configured for storing electrical energy, the battery comprising: - A battery body having a top portion with a top opening; - A cover assembly according to any one of the preceding claims, wherein the cover member is fastened to the top portion to close the top opening; as well as - An energy storage component, which is housed within the battery body and electrically connected to the cover member and the battery body.

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