Battery and battery pack

Abstract

The application relates to the technical field of battery manufacturing, and provides a battery and a battery pack, the battery comprising a shell, a cover plate and support bosses; the cover plate is fixedly connected with the shell, two pole columns and an explosion-proof valve are arranged on the cover plate, and the explosion-proof valve is arranged between the two pole columns; the support bosses are arranged between the pole columns and the explosion-proof valve, a pressure relief channel is formed between the two support bosses, the pressure relief channel is communicated with the explosion-proof valve; the support bosses have contact end faces which are contacted with structural members of the battery pack, and the height positions of the contact end faces are higher than the height positions of pole column end faces. Through the structure of the support bosses, the support of the structural members on the battery pack is realized, and the stability and safety of the battery monomer structure are improved. Further, through the proportion limitation of the length of the pressure relief channel and the overall length of the cover plate, the structural strength of the support bosses is higher, and more stable support in different use states is realized.

Description

Technical Field

[0001] This invention relates to the technical field of battery manufacturing, and more particularly to a battery and battery pack. Background Technology

[0002] A power battery is a rechargeable battery used to power devices such as electric vehicles, primarily by storing and releasing electrical energy to drive an electric motor.

[0003] In existing technology, the highest point of a battery cell is typically located on the terminal post of the cover plate. To ensure battery safety, battery cells are usually designed to avoid bearing excessive external forces to prevent damage to the internal structure. While this design helps improve battery safety, it also introduces some problems.

[0004] First, the overall strength of the battery pack is relatively low, which may affect its stability and safety under external impact or pressure. Second, when the battery pack is installed upside down, the explosion-proof valve faces downwards. In this case, if thermal runaway occurs, the external pressure relief channel of the explosion-proof valve can easily become blocked, thus failing to effectively release internal pressure and increasing safety hazards. Therefore, the existing design fails to adequately consider the safety performance and structural strength of the battery pack under different usage conditions. Summary of the Invention

[0005] This invention provides a battery and a battery pack to address the shortcomings of existing battery structures that struggle to balance safety performance and structural strength under different usage conditions.

[0006] This invention provides a battery, comprising: a casing, a cover plate, and a supporting boss; the cover plate is fixedly connected to the casing, and the cover plate is provided with two terminals and an explosion-proof valve, the explosion-proof valve being disposed between the two terminals; the supporting boss is disposed on the cover plate between each terminal and the explosion-proof valve, and a pressure relief channel is formed between the opposing walls of the two supporting bosses, the pressure relief channel communicating with the explosion-proof valve; wherein, the supporting boss protrudes from the cover plate toward a first side; and the supporting boss has a contact end face that contacts the structural components of the battery pack, and along the thickness direction of the cover plate, the height of the contact end face is higher than the height of the terminal end face; along the length direction of the cover plate, the length of the cover plate is 148mm≤L≤300mm, and the length of the pressure relief channel is L2, satisfying L2<0.5L.

[0007] According to the battery provided by the present invention, along the length direction of the cover plate, the two terminals have the same length L1, and 15mm≤L1≤32mm.

[0008] According to the battery provided by the present invention, the length of the pressure relief channel along the length direction of the cover plate is 15mm≤L2≤40mm.

[0009] According to the battery provided by the present invention, the height of the pressure relief channel along the thickness direction of the cover plate is 1mm≤H2≤6mm.

[0010] According to the battery provided by the present invention, the cross-sectional area of ​​the pressure relief channel is S2 = H2 * L2, and 15mm². 2 ≤S2≤260mm 2 And satisfy S2 > S1; where S1 is the design exhaust area.

[0011] According to the battery provided by the present invention, both of the terminals are located near the ends of the cover plate in the longitudinal direction, and the explosion-proof valve is located in the middle of the cover plate in the longitudinal direction.

[0012] According to the battery provided by the present invention, the width of the supporting boss is greater than the width of the electrode post along the width direction of the cover plate.

[0013] According to the battery provided by the present invention, in the width direction of the cover plate, the outer surfaces on both sides of the supporting boss are coplanar with the outer surfaces on both sides of the housing.

[0014] According to the battery provided by the present invention, the supporting boss and the cover plate are integrally formed.

[0015] The present invention also provides a battery pack, comprising: a housing and a plurality of batteries as described in any of the above claims, wherein the batteries are disposed within the housing and the contact plane on the support boss is connected to a structural member; wherein, in the thickness direction of the battery pack, at least one side of each battery cell is provided with a liquid cooling plate.

[0016] The battery and battery pack provided by this invention, by setting a supporting boss structure, achieve support for the structural components on the battery pack, thereby improving the stability and safety of the individual battery cell structure. Furthermore, by limiting the ratio of the pressure relief channel length to the overall length of the cover plate, the structural strength of the supporting boss is increased, achieving more stable support under different usage conditions. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the overall structural schematic diagrams of the battery provided by the present invention.

[0019] Figure 2This is the second schematic diagram of the overall structure of the battery provided by the present invention.

[0020] Figure 3 This is a schematic diagram of the overall structure of the battery pack provided by the present invention.

[0021] Figure label: 10. Housing; 20. Cover plate; 21. Support boss; 211. Contact end face; 30. Pole post; 40. Explosion-proof valve; 50. Pressure relief channel; 60. Structural component. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0025] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] In related technologies, a battery cover is provided on one side of the battery casing opening. The battery cover is usually a long, plate-like structure with terminals on it. Typically, the terminals are located at the highest point of each battery cell. This design helps prevent damage to the internal structure of the battery, but it also results in lower overall strength of the battery pack, limiting the stability and safety of the cells. Furthermore, due to the limited internal space of the casing, especially when the battery pack is installed upside down, if thermal runaway occurs inside the battery, the unstable support of the individual cells can block the leakage channels of the explosion-proof valve, further exacerbating the safety risks.

[0028] To address the issues in the relevant technologies, the following will be discussed in conjunction with... Figures 1-2The present invention describes a battery comprising a housing 10, a cover plate 20, and a support boss 21. The cover plate 20 is fixedly connected to the housing 10, and has two terminals 30 and an explosion-proof valve 40 disposed on the cover plate 20, with the explosion-proof valve 40 located between the two terminals 30. The support boss 21 is disposed on the cover plate 20 between each terminal 30 and the explosion-proof valve 40, and a pressure relief channel 50 for venting is formed between the opposing walls of the two support bosses 21, the pressure relief channel 50 being connected to the explosion-proof valve 40. The support boss 21 protrudes from the cover plate 20 toward a first side, and has a contact end face 211 that contacts the structural component 60 of the battery pack. Along the thickness direction of the cover plate 20, the height of the contact end face 211 is higher than the height of the end face of the terminal 30. Along the length direction of the cover plate 20, the length of the cover plate 20 is 148mm ≤ L ≤ 300mm, and the length of the pressure relief channel 50 is L2, satisfying L2 < 0.5L. Individual batteries are combined in parallel and series to form an overall battery pack structure. When the battery pack is subjected to external impact or pressure, the force is transmitted to the cover plate 20 of each battery, thereby applying a certain impact or force to the cover plate 20. This will affect the stability and safety of the battery cell structure. In this embodiment, by setting an individual support boss 21 on the cover plate 20, the support boss 21 is made in contact with the structural component 60 on the battery pack, thereby bearing pressure through the support boss 21, which improves the stability and safety of the overall battery structure. Furthermore, by setting the explosion-proof valve between adjacent support bosses 21, the support bosses 21 can strengthen the structural strength on both sides of the explosion-proof valve 40, so that it forms a stable pressure relief channel 50 in the space corresponding to the explosion-proof valve 40, avoiding the blockage of the pressure relief channel 50 of the explosion-proof valve 40 when the battery thermally runs away, thus improving the safety of the battery.

[0029] Specifically, the cover plate 20 is constructed as a long strip-shaped plate structure. A supporting boss 21 is formed on the surface of the cover plate 20 away from the housing 10, protruding in a direction away from the housing 10. The protruding end face serves as a contact plane, contacting the structural component 60 on the battery pack to bear external forces, thus improving the overall structural strength. For example, a liquid cooling plate is provided on the battery pack for internal temperature management. The liquid cooling plate contacts the contact plane, providing support for both the liquid cooling plate and the structural component 60. This design allows the battery pack to withstand external impacts through the supporting boss 21, improving its overall pressure resistance and enhancing its structural stability and safety performance.

[0030] Furthermore, the area of ​​the supporting boss 21 has a local reinforcement effect, and the explosion-proof valve 40 is located between the supporting bosses 21. This enables the explosion-proof valve 40 to have higher stability, and in the event of thermal runaway, it can form a stable pressure relief channel 50 through the raised structure to achieve rapid pressure relief and improve the safety performance of the battery.

[0031] In a specific embodiment, the support boss 21 is a raised solid structure made of the same material as the cover plate 20 body. The internal structure of the protruding part of the support boss 21 is hollow, forming a receiving groove. When the battery shell is installed on the cover plate 20, the groove opening faces the assembly space inside the shell 10, optimizing the space utilization inside the cell and thus providing more electrolyte receiving space for the battery, increasing the amount of electrolyte injected.

[0032] Understandably, in conventional cell cover plate 20 structures, the pole post 30 often serves as a support structure on the surface of the cover plate 20 away from the housing 10 to support the structural component 60. This means the outer surface of the pole post 30 is the highest protruding part, leading to poor structural stability of the battery pack under external impact forces and making it prone to structural damage, thus reducing battery safety performance. This embodiment addresses this by separately providing a support boss 21. The contact end face 211 on the support boss 21 contacts the structural component 60 on the battery pack, thereby enabling it to withstand external impact forces and improving the stability and safety of the battery structure. Furthermore, by placing the explosion-proof valve 40 between adjacent support bosses 21, it effectively protects the explosion-proof valve 40, maintaining its effectiveness and improving overall structural stability. Moreover, the end face height of the pole post 30 is lower than the contact end face 211, achieving thermal and electrical separation and improving the safety and stability of the cell.

[0033] In the above embodiment, the interval area between adjacent support bosses 21 serves as a pressure relief channel 50 for venting gas during thermal runaway of the battery cell. It occupies the space of the cover plate 20 in the length direction. Since the support bosses 21 are also located on the cover plate 20 and need to provide effective support when subjected to external forces, this embodiment ensures that the support bosses 21 have sufficient structural strength by limiting the ratio of the pressure relief channel 50 in the length direction to the length of the cover plate 20. The pressure relief channel 50 also provides effective venting space, enabling it to provide good structural stability and structural strength in different usage scenarios (such as battery cell inversion).

[0034] Specifically, the length of the pressure relief channel 50 needs to be significantly shorter than the length of the cover plate 20 (L2 < 0.5L). This ensures that after the explosion-proof valve 40 is opened, high-temperature gas and ejected materials can be quickly discharged through the shortest path, avoiding increased airflow resistance or pressure buildup due to an excessively long channel, thereby reducing the risk of secondary explosion. Furthermore, an excessively long pressure relief channel 50 would occupy too much space in the cover plate 20, potentially affecting the layout of other critical components such as the pole post 30, the explosion-proof valve 40, and the support boss 21. In particular, an excessively long pressure relief channel 50 would reduce the space occupied by the support boss 21, thus decreasing its load-bearing capacity; conversely, an excessively short channel could lead to concentrated exhaust flow, increasing the risk of localized thermal shock. The ratio is limited to within 0.5L, balancing space compactness, pressure relief effectiveness, and the structural strength of the support boss 21.

[0035] On the other hand, in this embodiment, the length of the cover plate 20 is limited to between 148mm and 300mm, which can cover the size requirements of mainstream power batteries (such as square / soft-pack cells). If the length is too small (<148mm), the spacing between the terminals 30 may be insufficient, affecting electrical safety; if it is too large (>300mm), the rigidity of the cover plate 20 may decrease, requiring additional structural reinforcement, increasing weight and cost.

[0036] In a specific implementation, the length L of the cover plate 20 is 148mm, 160mm, 180mm, 200mm, 246mm, or 300mm. L2 / L is 0.1, 0.2, 0.3, 0.4, or 0.5.

[0037] Furthermore, in this embodiment, the number of supporting bosses 21 is not limited, and they can be two or more protruding structures. For example, when there are two supporting bosses 21, such as... Figure 1 , Figure 3 As shown, the support boss 21 is a long, rectangular block. The surface of the support boss 21 protruding away from the housing 10 serves as a contact end face 211. The contact end face 211 can contact the structural component 60 on the battery, thereby effectively supporting external impacts or forces. Of course, there can be more than two support bosses 21, and two or more support bosses 21 can be arranged on the cover plate 20 in the manner described above.

[0038] Furthermore, this embodiment does not limit the shape of the supporting boss 21. It can be a block-shaped supporting boss 21, a cylindrical supporting boss 21, or a frustum-shaped or irregularly shaped frustum-shaped structure, etc. For ease of understanding and explanation, this embodiment and subsequent embodiments use a block-shaped supporting boss 21 as an example for illustration. Figure 1 As shown.

[0039] In some embodiments, the support boss 21 is integrally formed with the cover plate 20. This integral forming creates a support boss 21 protruding from the cover plate 20 on the surface of the cover plate 20 away from the housing 10, thereby enabling it to withstand external impacts or forces. Furthermore, the integral forming design improves the overall structural stability.

[0040] Specifically, the support boss 21 is integrally formed by stamping, and during stamping, a hollow receiving groove is formed on the surface of the cover plate 20 body facing the inside of the housing 10. The receiving groove is located in the area corresponding to the support boss 21, and the receiving groove can increase the capacity of the electrolyte inside the housing 10.

[0041] It is understandable that in conventional designs, the support boss 21 can be formed by welding or other connection methods. In this embodiment, the integral molding method can improve the structural strength of the support boss 21 and the cover plate 20, and enhance the overall structural stability of the cover plate 20.

[0042] In some embodiments, the two terminals 30 have the same length L1 along the length direction of the cover plate 20, and 15mm≤L1≤32mm. The length of the terminal 30 has a certain influence on the current conduction. In this example, by limiting the length of the terminal 30, good current conduction of the battery during charging and discharging can be ensured.

[0043] Specifically, this can lead to decreased battery performance, especially at high discharge currents, and may cause overheating issues. An appropriate length ensures efficient energy conduction while reducing unnecessary energy loss. Furthermore, batteries may experience temperature changes during operation, leading to thermal expansion. A suitable terminal post length helps mitigate the expansion effect caused by temperature variations. A terminal post that is too short may fail to accommodate these changes, while a terminal post that is too long may cause structural instability under extreme conditions. A range of 15mm to 32mm helps balance these factors. Furthermore, since the area where the terminal post 30 is located and the explosion-proof valve 40 are situated on the same cover plate 20, if the terminal post 30 is too long, it may affect the effective operation of the explosion-proof valve 40 and even the structural strength of the cover plate 20. Limiting the length of the terminal post 30 during the design phase helps ensure an appropriate distance is maintained between the terminal post 30 and the explosion-proof valve 40, thereby optimizing the effect of the pressure relief channel 50 and preventing the battery from exploding or leaking under overpressure conditions.

[0044] In a specific implementation, the length L1 of the pole post 30 is 15mm, 18mm, 20mm, 25mm, 28mm or 30mm.

[0045] In some embodiments, the length of the pressure relief channel 50 along the length direction of the cover plate 20 is 15mm ≤ L2 ≤ 40mm. The length of the pressure relief channel 50 affects the effective discharge of high-temperature gas and also affects the structural strength of other structures on the cover plate 20, such as the structural strength of the supporting boss 21. This embodiment improves the safety of the battery cell by limiting this length.

[0046] Specifically, the main function of the pressure relief channel 50 is to prevent excessive pressure caused by internal gas accumulation in the battery under conditions such as overcharging, over-discharging, short circuits, or abnormal temperatures, thereby ensuring battery safety. The length of the channel directly affects the smoothness of gas venting and the effectiveness of pressure release. A length range of 15mm to 40mm ensures that the channel can effectively expand when the pressure is too high, thereby quickly and effectively releasing gas and preventing battery rupture or leakage. A channel that is too short may result in ineffective gas venting, while a channel that is too long may waste space, affecting the battery's volume and energy density.

[0047] It is understood that the pressure relief channel 50 is formed by the spacing between adjacent support bosses 21, and the explosion-proof valve 40 is located inside the pressure relief channel 50 and communicates with it. This embodiment limits the length of the pressure relief channel 50 to allow for timely discharge of internal high-pressure gas in case of an emergency, and to provide effective support through the support bosses 21 under normal conditions.

[0048] In a specific implementation, the length L2 of the pressure relief channel 50 is 15mm, 20mm, 25mm, 30mm, 35mm or 40mm.

[0049] In conjunction with the above embodiments, along the thickness direction of the cover plate 20, the height of the pressure relief channel 50 is 1mm ≤ H2 ≤ 6mm. Once the battery cell experiences thermal runaway, its internal temperature will rise sharply, causing a large amount of high-temperature gas to accumulate inside in a short period of time. In this embodiment, by limiting the height of the pressure relief channel 50, sufficient gas discharge space is provided to prevent thermal runaway.

[0050] Specifically, the height of the pressure relief channel 50 is between 1mm and 6mm. This ensures that the channel opening is wide enough so that gas can be quickly released through the channel when the battery pressure becomes too high. If the channel height is too low, gas flow may be obstructed, preventing timely pressure release and increasing safety hazards. On the other hand, a channel that is too high may waste space and affect the battery's volume utilization rate.

[0051] Specifically, batteries generate gas under overcharge, over-discharge, or other abnormal conditions. The design of the pressure relief channel 50 needs to ensure sufficient space to quickly release these gases, preventing excessive internal pressure that could lead to battery rupture or leakage. A range of 1mm ≤ H2 ≤ 6mm effectively balances pressure relief efficiency with battery structural strength, ensuring battery safety under extreme conditions.

[0052] In a specific implementation, the height H2 of the pressure relief channel 50 is 1mm, 2mm, 3mm, 4mm, 5mm or 6mm.

[0053] In conjunction with the above embodiments, the cross-sectional area S2 of the pressure relief channel 50 is S2 = H2 * L2, and 15mm. 2 ≤S2≤260mm 2 And satisfying S2 > S1; where S1 is the designed exhaust area. The area of ​​the pressure relief channel 50 directly affects the rate at which the internal gas is discharged, which is directly related to the safety performance of the battery. This embodiment effectively ensures rapid gas release by limiting the cross-sectional area of ​​the pressure relief channel 50.

[0054] Specifically, the design venting area S1 = C * K, where C is the designed cell capacity (AH) and K is the design safety factor (mm² / AH), indicating that the venting area is determined based on the battery's cell capacity and the design safety factor. This design allows for flexible adjustment of the pressure relief capability according to the capacity requirements of different batteries, ensuring battery safety under different specifications and applications. The design safety factor (K) can be adjusted according to actual conditions (such as battery usage environment, load conditions, etc.), thereby effectively preventing dangers caused by abnormal conditions such as overcharging and over-discharging.

[0055] This embodiment, by setting the cross-sectional area to 15mm² ≤ S2 ≤ 260mm², ensures that the pressure relief channel 50 can effectively release gas when the battery experiences excessive pressure. If the cross-sectional area of ​​the pressure relief channel 50 is too small (below 15mm²), the gas discharge rate may be insufficient, causing pressure buildup and increasing the risk of battery explosion; while if the cross-sectional area is too large (above 260mm²), it may waste space and materials, reducing the battery's energy density. Therefore, a suitable cross-sectional area range can balance gas release and space utilization.

[0056] By limiting S2 to S1, it means that the gas flow capacity of the pressure relief channel 50 must be stronger than the actual exhaust requirements. This design ensures that under high pressure, the pressure relief channel 50 can provide sufficient space to avoid poor gas release and ensure that the battery pressure can be released quickly and evenly.

[0057] It is understood that, in this embodiment, by controlling the range of S2, the height (H2) and length (L2) of the pressure relief channel 50 can be flexibly adjusted according to actual needs in different types of battery designs. This helps to adjust the ability of the pressure relief channel 50 according to the battery's operating environment (such as temperature, load, etc.), thereby maintaining a stable pressure relief effect under various conditions.

[0058] The following specific examples demonstrate a comparative test of the above-mentioned value range, and the test structure is shown in Table 1 below.

[0059] Table 1

[0060] As can be seen from Table 1 above, the length L2 and height H2 of the pressure relief channel 50 along the length of the cover plate 20 need to be uniformly limited within the aforementioned reasonable range. Exceeding this range will increase the risk of thermal runaway. Furthermore, the ratio of the length L2 of the pressure relief channel 50 to the overall length of the cover plate 20 needs to be greater than 0.1. If the ratio is less than 0.1, the space of the pressure relief channel 50 will be too small, making it difficult to achieve rapid discharge of high-temperature gas inside.

[0061] In some embodiments, both terminals 30 are located near the ends of the cover plate 20 along its length, while the explosion-proof valve 40 is located in the middle of the cover plate 20 along its length. This embodiment, by placing the two terminals 30 at the ends of the battery cover plate 20, avoids the formation of large pressure concentration areas inside the battery. The end design helps to distribute the electrochemical reaction areas of the battery more evenly, which is beneficial to improving the battery's energy density and performance. Furthermore, the explosion-proof valve 40, located in the middle of the battery cover plate 20, can better balance the release of internal pressure. When the battery malfunctions or is overcharged, the explosion-proof valve 40 can evenly distribute the pressure, thereby preventing excessive internal pressure from concentrating on one side and reducing the risk of localized rupture.

[0062] Specifically, internal battery pressure is typically caused by gas accumulation. If poorly designed, gas accumulation on one side can lead to excessively high local pressure, potentially causing an explosion or rupture. By placing the explosion-proof valve 40 in the center of the cover plate 20, more uniform gas discharge can be achieved, avoiding concentrated overpressure at one end and improving battery safety. The central position of the cover plate 20 helps ensure that the explosion-proof valve 40 can release internal pressure to the maximum extent when needed, preventing the formation of excessively high local pressure points and reducing the risk of battery rupture or explosion. This central position is particularly effective when terminals 30 are designed at both ends of the battery, allowing for more even gas pressure discharge.

[0063] On the other hand, the fact that the terminal post 30 is located at the end of the battery can prevent excessive heat from concentrating in the center of the battery. The inside of a battery typically experiences high temperatures, and heat accumulation can affect battery performance or shorten its lifespan. By properly configuring the positions of the terminal post 30 and the explosion-proof valve 40, heat can be better dispersed, preventing thermal runaway caused by excessive temperature.

[0064] Of course, one of the terminals 30 at both ends is the positive terminal 30, and the other is the negative terminal 30. This arrangement design facilitates the wiring layout when the batteries are assembled into a battery pack.

[0065] In some embodiments, the width of the support boss 21 is greater than the width of the pole post 30 along the width direction of the cover plate 20. By limiting the width of the support boss 21 to be greater than that of the pole post 30, the support boss 21 bears load more evenly, thereby improving the stability of the overall structure.

[0066] The width of the support boss 21 is greater than the width of the electrode post 30 surface, and the total area of ​​the contact planes on two or more support bosses 21 is greater than the total area of ​​the electrode post 30 surface. This allows the contact planes on the support bosses 21 to have a larger contact area with the structural components 60 on the battery pack in the width direction, making the force more uniform and providing higher load-bearing capacity.

[0067] Specifically, when both the supporting boss 21 and the pole post 30 are block-shaped structures, the width of the supporting boss 21 is greater than that of the pole post 30 along the width direction of the cover plate 20. When both the supporting boss 21 and the pole post 30 are cylindrical structures, the radial width of the supporting boss 21 is greater than that of the pole post 30 along the width direction of the cover plate 20. This allows the supporting boss 21 to have a larger contact area when under pressure, making the force more dispersed and avoiding stress concentration that could lead to structural damage.

[0068] Understandably, by limiting the width of the support boss 21 to be greater than the width of the pole post 30 surface, it is possible to distribute the force more evenly, thus avoiding stress concentration.

[0069] In conjunction with the above embodiments, in the width direction of the cover plate 20, the outer surfaces of both sides of the support boss 21 are coplanar with the outer surfaces of both sides of the housing 10. By limiting the width of the outer surface of the support boss 21 to be coplanar with the outer surface of the housing 10, the support boss 21 has a larger contact area, thereby achieving effective support for the structural component 60 and further improving the stability of the support.

[0070] Specifically, under external impact or force, the support boss 21 bears the pressure, and part of the pressure is transmitted to the outer surface of the shell 10 through the coplanar outer side, thereby effectively dispersing the force, avoiding stress concentration, and improving the overall stability.

[0071] Furthermore, the coplanarity of the outer surfaces between the supporting boss 21 and the housing 10 facilitates rapid inspection of assembly quality. That is, corresponding tooling or calibration devices can be used to check whether the outer surfaces are coplanar, and the assembly qualification can be determined based on the inspection results. For example, during inspection, other existing mold inspection methods can be used. If the outer surfaces on both sides are coplanar, it indicates proper assembly and the product is qualified. If either outer surface is not coplanar, the assembly is unqualified. This achieves efficient and rapid self-inspection, improves product quality, and enriches calibration methods.

[0072] The present invention also provides a battery pack, comprising: a housing and a plurality of batteries as described in any of the above claims, wherein the batteries are disposed within the housing and the contact plane on the support boss 21 is connected to the structural member 60; wherein, in the thickness direction of the battery pack, at least one side of each battery cell is provided with a liquid cooling plate.

[0073] Specifically, the liquid cooling plate can be placed on either side of the battery pack's thickness direction, such as... Figure 3 As shown, the liquid cooling plate can be located on the side of the battery pack away from the cover plate 20. That is, the cover plate 20 on the battery cell is connected to the structural component 60 by adhesive bonding or snap-fit, while the liquid cooling plate is located on the opposite side of the cover plate 20, thereby controlling the temperature inside the battery pack. Alternatively, the liquid cooling plate can be located on the side closer to the cover plate 20. That is, the cover plate 20 is connected to the structural component 60 by adhesive bonding or snap-fit, and the liquid cooling plate is located on the side of the structural component 60 away from the battery cell. To facilitate the normal pressure relief of the explosion-proof valve 40 on the cover plate 20, a pressure relief structure (such as a pressure relief structure or a perforated structure) can be provided on the liquid cooling plate, with the pressure relief structure directly opposite the explosion-proof valve 40.

[0074] Of course, as shown in the figure, liquid cooling plates can also be provided on both sides of the battery pack in the thickness direction to control the internal temperature of the battery pack. Similarly, in a specific setting, a pressure relief structure (such as a pressure relief channel 50 formed by intervals, or a hollow structure) is provided on the liquid cooling plate on the side near the cover plate 20. The pressure relief structure is directly opposite the explosion-proof valve 40, so as to facilitate the normal pressure relief of the explosion-proof valve 40 on the cover plate 20.

[0075] The battery pack provided in this example has battery cells of any of the aforementioned embodiments. Therefore, the battery pack in this example has the characteristic effects of each of the aforementioned battery embodiments. To avoid redundancy in the description of the effects, they will not be repeated here.

[0076] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment, by setting the structure of the support boss 21, achieves support for the structural component 60 on the battery pack, thereby improving the stability and safety of the battery structure. Furthermore, by placing the explosion-proof valve 40 between the support bosses 21, the pressure relief channel 50 can be kept unobstructed during battery thermal runaway, improving the battery's safety performance.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery, characterized in that, include: case; A cover plate is fixedly connected to the housing. The cover plate is provided with two pole posts and an explosion-proof valve, with the explosion-proof valve located between the two pole posts. A support boss is provided on the cover plate between each of the pole posts and the explosion-proof valve. A pressure relief channel is formed between the opposing walls of two support bosses, and the pressure relief channel is connected to the explosion-proof valve. The supporting boss protrudes from the cover plate toward the first side; and the supporting boss has a contact end face that contacts the structural components of the battery pack, and the height of the contact end face is higher than the height of the pole end face along the thickness direction of the cover plate. Along the length of the cover plate, the length of the cover plate is 148mm≤L≤300mm, and the length of the pressure relief channel is L2, satisfying L2<0.5L; Along the length of the cover plate, the length of the pressure relief channel is 15mm≤L2≤40mm; Along the thickness direction of the cover plate, the height of the pressure relief channel is 1mm≤H2≤6mm.

2. The battery according to claim 1, characterized in that, Along the length of the cover plate, the two poles have the same length L1, and 15mm≤L1≤32mm.

3. The battery according to claim 1, characterized in that, The cross-sectional area of ​​the pressure relief channel is S2 = H2 * L2, and 15mm. 2 ≤S2≤260mm 2 And satisfy S2 > S1; where S1 is the designed exhaust area, S1 = C * K, C is the designed cell capacity (AH), and K is the designed safety factor (mm). 2 / AH.

4. The battery according to claim 3, characterized in that, Both poles are located near the ends of the cover plate along its length, and the explosion-proof valve is located in the middle of the cover plate along its length.

5. The battery according to claim 1, characterized in that, Along the width direction of the cover plate, the width of the support boss is greater than the width of the pole post.

6. The battery according to claim 5, characterized in that, In the width direction of the cover plate, the outer surfaces on both sides of the support boss are coplanar with the outer surfaces on both sides of the housing.

7. The battery according to claim 1, characterized in that, The support boss is integrally formed with the cover plate.

8. A battery pack, characterized in that, include: shell; The battery according to any one of claims 1-7, wherein the battery is disposed within a housing, and the contact plane on the support boss is connected to the structural member; In the thickness direction of the battery pack, at least one side of each battery cell is provided with a liquid cooling plate.

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