Battery cell and battery pack

Abstract

The application relates to the battery technical field and provides a battery cell and a battery pack. The battery cell comprises a shell with openings at two ends, and cover plates arranged at the two ends in the length direction of the shell, each cover plate is used for sealing the opening on the corresponding side; a positive pole column and a negative pole column are arranged on one of the cover plates, and a boss is arranged between the positive pole column and the negative pole column, the boss is formed in a protruding mode outward from the cover plate, a groove corresponding to the boss is formed on the side of the cover plate facing the shell, and an anti-explosion valve of the battery cell is arranged on one side wall in the width direction of the shell. The battery cell can realize a certain degree of thermal-electric separation, the exhaust path is short, the exhaust is smoother, the risk of shell rupture can be reduced, meanwhile, the groove can increase the accommodation space of electrolyte in the shell, so that the cycle life of the battery cell is improved, and therefore the battery cell has better safety and reliability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a single battery cell and a battery pack. Background Technology

[0002] In related technologies, short-blade energy storage cells typically employ a cell design with electrodes on the same side and explosion-proof valves on opposite sides to achieve a certain degree of thermoelectric separation (required for safety reasons), resulting in better safety. Simultaneously, the number of components in the cell's sampling CCS (Cell Contact System; integrated busbar system, also known as sampling assembly) is reduced, which helps lower costs. However, the internal venting path of this cell is relatively long, leading to poor venting of the explosion-proof valve. This makes the cell more susceptible to casing rupture in the event of thermal runaway, potentially triggering other uncontrollable risks. Furthermore, the electrode groups in short-blade cells are mostly stacked, resulting in a large proportion of the electrode groups within the casing and insufficient electrolyte, which affects the cell's cycle life and reduces its reliability. Therefore, the reliability and safety of traditional short-blade cells still need improvement. Utility Model Content

[0003] In view of this, this application aims to propose a single battery cell with better reliability and safety.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery cell includes a housing with openings at both ends, and cover plates disposed at both ends of the housing along its length, each cover plate being used to cover the opening on the corresponding side. The cover plate is provided with a positive terminal and a negative terminal, and a boss is provided between the positive terminal and the negative terminal. The boss is formed by protruding outward from the cover plate, and a groove corresponding to the boss is formed on the side of the cover plate facing the housing. A cell explosion-proof valve is provided on one side wall of the housing in the width direction.

[0005] Furthermore, along the length of the housing, the cell explosion-proof valve is located in the middle of the housing; and / or, another cover plate is provided with a liquid injection hole.

[0006] Compared with related technologies, this application has the following advantages: (1) The battery cell described in this application can achieve a certain degree of thermoelectric separation by setting a positive terminal and a negative terminal on one of its cover plates and setting a battery cell explosion-proof valve on one side wall in the width direction of the housing. Compared with the case where the battery cell explosion-proof valve is set on the cover plate opposite to the positive terminal and the negative terminal, the different positions in the housing are closer to the battery cell explosion-proof valve, which makes the exhaust path shorter and the exhaust smoother, so as to reduce the risk of housing breakage. At the same time, a boss is set on the cover plate with the positive terminal and the negative terminal, and a groove corresponding to the boss is formed on the side of the cover plate facing the housing, which can increase the electrolyte capacity in the housing, thereby improving the cycle life of the battery cell and thus improving the safety and reliability of the battery cell.

[0007] (2) Along the length of the casing, the cell explosion-proof valve is located in the middle of the casing, which makes different positions inside the casing closer to the cell explosion-proof valve, which helps to shorten the exhaust path and achieve relatively better exhaust smoothness, thereby reducing the risk of casing breakage. At the same time, by setting the liquid injection hole on another cover plate, the casing can be placed vertically, and the liquid injection operation can be performed on the casing from the top in this vertical position, making it easier to fill the casing with electrolyte.

[0008] This application also proposes a battery pack, including a cell assembly; The battery cell assembly has several individual battery cells arranged in sequence as described above.

[0009] Furthermore, it also includes a tray and a top cover disposed on the tray, wherein the battery cell assembly is disposed within a cavity formed between the tray and the top cover.

[0010] Furthermore, in the battery cell assembly, the arrangement direction of each individual battery cell is the same as the thickness direction of any individual battery cell, and the explosion-proof valve of each individual battery cell is located at the top of the battery cell assembly; the top cover has a top cover and a frame disposed on the side of the top cover facing the tray, the top cover is provided with an exhaust channel, and each battery cell explosion-proof valve is connected to the battery pack explosion-proof valve disposed on the frame through the exhaust channel.

[0011] Furthermore, the top cover includes a first substrate and a second substrate connected together. The first substrate abuts against the top of the battery cell assembly, and the second substrate is located on the side of the first substrate away from the battery cell assembly. The exhaust channel is formed between the first substrate and the second substrate, and the first substrate is provided with vent holes that correspond one-to-one with the explosion-proof valves of each battery cell.

[0012] Furthermore, a sealing strip is provided between the first substrate and the battery cell assembly, and the sealing strip is provided with clearance holes corresponding to each of the ventilation holes.

[0013] Furthermore, the cell group consists of at least two groups arranged along the length of any one of the cell units; the sides of two adjacent groups of cell groups with each injection hole are joined together, and / or, the venting channel includes a first channel connected to each cell explosion-proof valve of each cell group, and a second channel connecting each of the first channels, the second channel being connected to the battery pack explosion-proof valve.

[0014] Furthermore, an exhaust guide shroud is provided between the top cover and the frame, and an exhaust guide channel is formed between the exhaust guide shroud, the top cover, and the frame. The exhaust channel is connected to the battery pack explosion-proof valve through the exhaust guide channel.

[0015] Furthermore, it also includes electrical components disposed within the cavity, a maintenance window corresponding to the electrical components is provided on the frame, and a maintenance cover plate is detachably disposed at the maintenance window; and / or, end plates are respectively provided at both ends of the battery cell assembly along the arrangement direction of each battery cell, and the top cover is screwed to each of the end plates.

[0016] The battery pack described in this application contains the aforementioned individual battery cells, which have the same beneficial effects as traditional technologies, and will not be elaborated further here.

[0017] Furthermore, the arrangement direction of each individual cell in the battery pack is the same as the thickness direction of any single cell, and the explosion-proof valve of each individual cell is located at the top of the battery pack. Simultaneously, the top cover has an exhaust channel, and the frame has a battery pack explosion-proof valve. Each cell's explosion-proof valve is connected to the battery pack's explosion-proof valve through the exhaust channel. This design isolates the venting process from the electrical connection structure within the pack, achieving overall thermoelectric separation of the battery pack and improving overall pack safety. A sealing strip with corresponding clearance holes ensures a tight seal between the cell explosion-proof valve and the exhaust channel, preventing the opening gas and electrolyte from the cell explosion-proof valve from entering the pack in the event of thermal runaway of a single cell, thus achieving better thermoelectric separation.

[0018] Furthermore, the cell packs consist of at least two groups arranged along the length of any single cell, with the sides of adjacent groups containing the injection holes joined together. This improves the utilization of internal space and thus enhances the overall energy density of the pack. Additionally, the inclusion of an exhaust shroud facilitates communication between the exhaust channel and the battery pack's explosion-proof valve. The combined design of the maintenance window and cover facilitates the inspection and replacement of electrical components. The installation of end plates, with the top cover screwed to each end plate, strengthens the overall structural integrity and ensures the pack's stability. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of a single battery cell described in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the second cover plate described in an embodiment of this application; Figure 3 This is a schematic diagram of the battery pack structure described in an embodiment of this application; Figure 4 This is a schematic diagram of the assembly of the battery pack and tray as described in the embodiments of this application; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the bus structure described in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the exhaust shroud described in the embodiment of this application; Explanation of reference numerals in the attached figures: 100. Single battery cell; 101. Housing; 1011. First sidewall; 1012. Second sidewall; 102. First cover plate; 103. Second cover plate; 1031. Injection hole; 104. Positive electrode post; 105. Negative electrode post; 106. Boss; 107. Cell explosion-proof valve; 200. Battery cell assembly; 201. End plate; 202. Sampling assembly; 2021. Busbar; 20211. First connection part; 20212. Intermediate part; 20213. Second connection part; 300. Pallet; 400. Top cover; 401. Top cover; 4011. Through hole; 402. Frame; 4021. Maintenance cover; 403. Exhaust channel; 4031. First channel; 4032. Second channel; 500. Battery pack explosion-proof valve; 600. Sealing strip; 700. Exhaust guide cover; 800. Threaded connector. Detailed Implementation

[0020] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0022] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0024] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0026] An embodiment of the first aspect of this application provides a battery cell 100 with a longer cycle life and better safety quality.

[0027] In related technologies, short-blade energy storage cells typically employ a cell design with electrodes on the same side and explosion-proof valves on opposite sides to achieve a certain degree of thermoelectric separation (required for safety reasons), resulting in better safety. Simultaneously, this cell has fewer components in its CCS (Cell Contact System, integrated busbar system), which helps reduce costs. However, the long internal venting path of this cell leads to poor venting of the explosion-proof valve, making the casing prone to rupture in the event of thermal runaway, potentially triggering other uncontrollable risks. Furthermore, the electrode groups in short-blade cells are mostly stacked, resulting in a large proportion of the electrode groups within the casing and insufficient electrolyte, affecting the cell's cycle life and reducing reliability. Therefore, the reliability and safety of traditional short-blade cells still need improvement.

[0028] In view of this, in order to overcome the shortcomings of the related technology, the battery cell 100 in this embodiment incorporates... Figure 1 and Figure 2 As shown, the overall design includes a battery cell 100, a housing 101 with openings at both ends, and cover plates at both ends of the housing 101 along its length, each cover plate being used to seal the opening on the corresponding side.

[0029] One of the cover plates is provided with a positive terminal 104 and a negative terminal 105, and a boss 106 is provided between the positive terminal 104 and the negative terminal 105. The boss 106 is formed by protruding outward from the cover plate, and a groove corresponding to the boss 106 is formed on the side of the cover plate facing the housing 101. A cell explosion-proof valve 107 is provided on one side wall of the housing 101 in the width direction.

[0030] Therefore, by setting a positive electrode post 104 and a negative electrode post 105 on one of the cover plates, and setting a cell explosion-proof valve 107 on one side wall in the width direction of the housing 101, a certain degree of thermoelectric separation can be achieved. Compared with the case where the cell explosion-proof valve 107 is set on the cover plate opposite to the positive electrode post 104 and the negative electrode post 105, the different positions inside the housing 101 are closer to the cell explosion-proof valve 107, which makes the exhaust path shorter and the exhaust smoother, thereby reducing the risk of housing 101 cracking. At the same time, a boss 106 is set on the cover plate with the positive electrode post 104 and the negative electrode post 105, and a groove corresponding to the boss 106 is formed on the side of the cover plate facing the housing 101, which can increase the electrolyte capacity inside the housing 101, thereby improving the cycle life of the cell 100 and thus improving the safety and reliability of the cell 100.

[0031] Based on the above overview, specifically in this embodiment, for ease of distinction, the cover plate with the positive terminal 104 and the negative terminal 105 is referred to as the first cover plate 102, and the other cover plate is referred to as the second cover plate 103. Simultaneously, the two large sidewalls of the housing 101 arranged opposite each other along its thickness direction are both referred to as the second sidewalls 1012, and the two small sidewalls of the housing 101 arranged opposite each other along its width direction are both referred to as the first sidewalls 1011. That is, the cell explosion-proof valve 107 is disposed on one of the first sidewalls 1011. Furthermore, any structures not mentioned in the housing 101, the first cover plate 102, and the second cover plate 103 can be referred to as relevant structural parts in cover plate structures well known to those skilled in the art, and will not be elaborated upon here.

[0032] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment vary depending on the orientation of the housing 101 of the battery cell 100. That is, each direction in this embodiment refers to a relative coordinate system with the housing 101 as the reference. Furthermore, the length direction of the housing 101 is the length direction of the battery cell 100, the width direction of the housing 101 is the width direction of the battery cell 100, and the thickness direction of the housing 101 is the thickness direction of the battery cell 100.

[0033] Continue to combine Figure 1 As shown, in some exemplary embodiments, the cell explosion-proof valve 107 is located in the middle of the housing 101 along the length of the housing 101. This allows different locations within the housing 101 to be close to the cell explosion-proof valve 107, which helps to shorten the exhaust path and achieve relatively better exhaust smoothness, thereby reducing the risk of housing 101 rupture.

[0034] At the same time, in some of the exemplary implementations, the combination continues... Figure 2 As shown, the second cover plate 103 is provided with a liquid injection hole 1031. The main advantage of this setting is that the housing 101 can be placed vertically, and the liquid injection operation can be performed on the housing 101 from the top in this vertically placed state, making it easier to fill the housing with electrolyte.

[0035] It should be mentioned that the battery cell 100 of this application, based on the setting of the boss 106, can provide support for the sampling assembly 202 when the battery cell 100 is assembled, so that the circuit board and nickel sheet and other components in the sampling assembly 202 do not need to be designed with some stamping or bending, but only need to be designed in a straight form, thereby reducing the design complexity and cost of the sampling assembly 202. At the same time, with the support of the boss 106, the connection between the circuit board and the nickel sheet in the sampling assembly 202 can be prevented from being subjected to vibration stress, which can cause abnormal problems such as loose electrical connection. This improves the reliability of the sampling assembly 202.

[0036] An embodiment of the second aspect of this application provides a battery pack including a cell assembly 200. Specifically, the cell assembly 200 has a plurality of individual cell units 100 arranged sequentially as described above.

[0037] Continue to combine Figures 2 to 7 As shown, in some exemplary embodiments, the battery pack also includes a tray 300 and a cover 400 disposed on the tray 300, with the cell assembly 200 disposed within a cavity formed between the tray 300 and the cover 400.

[0038] Furthermore, in some exemplary embodiments, in the cell assembly 200, the arrangement direction of each individual cell 100 is the same as the thickness direction of any individual cell, and the cell explosion-proof valve 107 of each individual cell 100 is located at the top of the cell assembly 200. Additionally, the top cover 400 has a top cover 401 and a frame 402 disposed on the side of the top cover 401 facing the tray 300. The top cover 401 is provided with an exhaust channel 403, and each cell explosion-proof valve 107 is connected to a battery pack explosion-proof valve 500 disposed on the frame 402 through the exhaust channel 403.

[0039] The main advantage of this design is that it isolates the venting process from the electrical connection structure inside the pack, achieving overall thermoelectric separation of the battery pack. This greatly reduces the risk of fire and explosion caused by short circuits, arcing, electrolyte leakage, or electrolyte accumulation during thermal runaway, thus significantly improving the safety of the battery pack.

[0040] In a specific implementation, the tray 300 of this embodiment has a receiving groove for accommodating the battery cell assembly 200, and a connecting platform located around the receiving groove. A connecting flange is formed on the side edge of the frame 402 away from the top cover 401, and the connecting flange and the connecting platform are connected together.

[0041] In addition, continue to combine Figures 2 to 7 As shown, in some exemplary embodiments, the top cover 401 includes a first substrate and a second substrate connected together. The first substrate abuts against the top of the battery cell assembly 200, and the second substrate is located on the side of the first substrate away from the battery cell assembly 200. An exhaust channel 403 is formed between the first substrate and the second substrate, and the first substrate is provided with vent holes 4011 that correspond one-to-one with the explosion-proof valves 107 of each battery cell.

[0042] Specifically, a recess is formed on the side of the second substrate facing the first substrate. When the first substrate and the second substrate are fastened together, an exhaust channel 403 is formed in the recess, and each vent hole 4011 is provided corresponding to and connected to the exhaust channel 403.

[0043] Continue to combine Figure 4 and Figure 5As shown, in some exemplary embodiments, a sealing strip 600 is provided between the first substrate and the cell assembly 200, and the sealing strip 600 has clearance holes corresponding to each vent hole 4011. Here, the sealing strip 600, with its clearance holes corresponding to each vent hole 4011, ensures the sealing of the cell explosion-proof valve 107 to the exhaust channel 403, preventing the opening gas and electrolyte from the cell explosion-proof valve 107 from entering the package in the event of thermal runaway of the cell 100, thereby achieving better thermoelectric separation.

[0044] In addition, continue to combine Figure 4 and Figure 5 As shown, in some exemplary embodiments, the cell packs 200 are at least two groups arranged along the length of any single cell 100. The sides of adjacent cell packs 200 with each injection port 1031 are joined together. The main advantage of this arrangement is that it improves the utilization of internal space, thereby increasing the overall energy density of the pack.

[0045] In some exemplary embodiments, the exhaust channel 403 includes a first channel 4031 connected to the explosion-proof valve 107 of each cell in each cell group 200, and a second channel 4032 connecting each of the first channels 4031, the second channel 4032 being connected to the battery pack explosion-proof valve 500. This arrangement allows for a reasonable layout of the exhaust channel 403.

[0046] Furthermore, continue to combine Figure 7 As shown, in some exemplary embodiments, an exhaust shroud 700 is provided between the top cover 401 and the frame 402, and an exhaust shroud 700 forms a guide channel with the top cover 401 and the frame 402. The exhaust channel 403 is connected to the battery pack explosion-proof valve 500 through the guide channel. By providing the exhaust shroud 700, it is convenient to achieve the connection between the exhaust channel 403 and the battery pack explosion-proof valve 500.

[0047] It is understandable that, since the exhaust channel 403 is located on the top cover 401 and the battery pack explosion-proof valve 500 is located on the frame 402, along the height direction of the battery pack, the exhaust channel 403 is located above the battery pack explosion-proof valve 500. The setting of the exhaust guide shroud 700 can just make up for the height difference between the exhaust channel 403 and the battery pack explosion-proof valve 500, thus realizing the connection between the two.

[0048] In addition, continue to combine Figure 3 and Figure 4As shown, in some exemplary embodiments, the battery pack also includes electrical components housed within the cavity, a maintenance window corresponding to the electrical components on the frame 402, and a maintenance cover 4021 detachably disposed at the maintenance window. This facilitates the inspection and replacement of the electrical components.

[0049] Meanwhile, in some exemplary embodiments, the battery cell assembly 200 has end plates 201 at both ends along the arrangement direction of each individual battery cell 100, and the top cover 400 is screwed to each end plate 201. It can be understood that by setting the end plates 201 and screwing the top cover 400 to each end plate 201, the structural strength of the entire package can be enhanced, ensuring the structural stability of the entire package.

[0050] Specifically, the top cover 400 is screwed to each end plate 201 via bolts 800, which can be common bolts or screws. Furthermore, the number and arrangement of the bolts 800 can be set and adjusted according to the overall structural strength requirements of the battery pack. For example, along the length of each end plate 201, that is, along the length of any single cell 100, the bolts 800 on each end plate 201 can be arranged in two or three spaced intervals.

[0051] In addition, in this embodiment, the battery cell assembly 200 also includes a sampling assembly 202 disposed on one side of the battery cell assembly 200 having each boss 106 along the length direction of any individual battery cell 100. At least the circuit board (i.e., FPC board) in the sampling assembly 202 is supported on the boss 106 of each individual battery cell 100. Based on the arrangement of each boss 106, support can be provided for the sampling assembly 202, so that the circuit board and nickel sheet and other components in the sampling assembly 202 do not need to be stamped or bent, but only need to be designed in a straight form, thereby reducing the design complexity and cost of the sampling assembly 202. At the same time, under the support of the boss 106, the connection between the circuit board and the nickel sheet in the sampling assembly 202 can be prevented from being subjected to vibration stress, which could cause abnormal problems such as loose electrical connection, thereby improving the reliability of the sampling assembly 202.

[0052] Furthermore, it should be mentioned that in this embodiment, if the battery cell assembly 200 uses stacked battery cells 100 of uniform specifications, then along the arrangement direction, the positive terminals of adjacent battery cells 100 correspond to each other, and the negative terminals correspond to each other. To achieve series connection between adjacent battery cells 100, as follows... Figure 6As shown, adjacent battery cells 100 are preferably connected by a diagonally spanned busbar 2021. Specifically, the busbar 2021 includes a first connecting portion 20211 connecting the positive (or negative) electrode of the left battery cell 100 and a second connecting portion 20213 connecting the negative (or positive) electrode of the right battery cell 100, as well as an intermediate portion 20212 connecting the first connecting portion 20211 and the second connecting portion 20213. This ensures that adjacent battery cells 100 are connected in series while also ensuring that the explosion-proof valve 107 of each battery cell 100 is located at the top to communicate with the exhaust channel 403.

[0053] In this embodiment, the battery pack 200, if it is as follows... Figure 5 As shown, two adjacent battery cells 100 are connected in a common way, that is, along the arrangement direction, the positive (or negative) terminal of the left battery cell 100 is opposite to the negative (or positive) terminal of the right battery cell 100 and they are connected together by an aluminum bar. At this time, two specifications of battery cells 100 are required. The main difference between the two specifications of battery cells 100 is that the positive terminal 104 of one battery cell 100 is located on the side close to the battery cell explosion-proof valve 107, and the negative terminal 105 of the other battery cell 100 is located on the side close to the battery cell explosion-proof valve 107. In this way, two adjacent battery cells 100 can be connected in series by a common aluminum bar, and it can also be ensured that the battery cell explosion-proof valve 107 of each battery cell 100 is located at the top so as to be connected to the exhaust channel 403.

[0054] It is worth noting that, for the battery pack of this embodiment, based on the above exemplary embodiments, in a specific implementation, as a preferred embodiment, as shown in the figure, the battery pack includes a cell group 200, in which a plurality of the above-mentioned individual cell units 100 are arranged in sequence.

[0055] The battery cell 100 includes a housing 101 with openings at both ends, and cover plates located at both ends of the housing 101 along its length. Each cover plate is used to seal the opening on the corresponding side. Furthermore, one cover plate has a positive terminal 104 and a negative terminal 105, and a boss 106 located between the positive terminal 104 and the negative terminal 105. The boss 106 protrudes outward from the cover plate, and a corresponding groove is formed on the side of the cover plate facing the housing 101. A battery cell explosion-proof valve 107 is provided on one side wall of the housing 101 along its width.

[0056] Along the length of the housing 101, the cell explosion-proof valve 107 is located in the middle of the housing 101. Meanwhile, another cover plate is provided with an injection hole 1031.

[0057] The battery pack also includes a tray 300 and a cover 400 disposed on the tray 300, and the cell assembly 200 is disposed in the cavity formed between the tray 300 and the cover 400.

[0058] In the cell assembly 200, the arrangement direction of each individual cell 100 is the same as the thickness direction of any individual cell, and the cell explosion-proof valve 107 of each individual cell 100 is located at the top of the cell assembly 200. The top cover 400 has a top cover 401 and a frame 402 located on the side of the top cover 401 facing the tray 300. The top cover 401 is provided with an exhaust channel 403, and each cell explosion-proof valve 107 is connected to the battery pack explosion-proof valve 500 located on the frame 402 through the exhaust channel 403.

[0059] The top cover 401 includes a first substrate and a second substrate connected together. The first substrate abuts against the top of the battery cell assembly 200, and the second substrate is located on the side of the first substrate away from the battery cell assembly 200. An exhaust channel 403 is formed between the first substrate and the second substrate, and the first substrate is provided with vent holes 4011 that correspond one-to-one with the explosion-proof valves 107 of each battery cell.

[0060] A sealing strip 600 is provided between the first substrate and the battery cell assembly 200, and the sealing strip 600 is provided with clearance holes corresponding to each vent hole 4011.

[0061] The battery cell group 200 comprises at least two groups arranged along the length of any single battery cell 100. Furthermore, the sides of two adjacent battery cell groups 200 having their respective injection holes 1031 are joined together. Additionally, the venting channel 403 includes a first channel 4031 connected to the explosion-proof valve 107 of each battery cell in each battery cell group 200, and a second channel 4032 connecting each of the first channels 4031, the second channel 4032 being connected to the battery pack explosion-proof valve 500.

[0062] Among them, an exhaust guide shroud 700 is provided between the top cover 401 and the frame 402. An exhaust guide shroud 700 forms a guide channel with the top cover 401 and the frame 402. The exhaust channel 403 is connected to the battery pack explosion-proof valve 500 through the guide channel.

[0063] The battery pack also includes electrical components housed within the cavity, and a maintenance window for the corresponding electrical components is provided on the frame 402, as well as a maintenance cover 4021 detachably provided at the maintenance window. Furthermore, end plates 201 are provided at both ends of the cell assembly 200 along the arrangement direction of each individual cell 100, and the top cover 400 is screwed to each end plate 201.

[0064] In the preferred embodiments of the battery pack described above, the specific configuration and arrangement of the individual battery cell 100, cell assembly 200, tray 300, top cover 400, battery pack explosion-proof valve 500, sealing strip 600, and exhaust duct 700 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the individual battery cell 100, cell assembly 200, tray 300, top cover 400, battery pack explosion-proof valve 500, sealing strip 600, and exhaust duct 700 can also be referred to the descriptions in the above exemplary embodiments.

[0065] The battery pack in this embodiment adopts the above design. The positive terminal 104 and negative terminal 105 of the battery cell 100 are set on one of its cover plates, and the battery cell explosion-proof valve 107 is set on one side wall in the width direction of the housing 101. This achieves thermal and electrical separation of the battery cell 100. Based on the design of the exhaust channel 403 connecting each battery cell explosion-proof valve 107 and the battery pack explosion-proof valve 500, the exhaust process can be isolated from the electrical connection structure inside the pack, achieving thermal and electrical separation of the entire battery pack, thereby improving the safety of the entire pack.

[0066] Meanwhile, based on the protrusion 106 in the battery cell 100, it can provide support for the sampling assembly 202 when the battery cells 100 are assembled. This means that components such as the circuit board and nickel sheet in the sampling assembly 202 do not need to be stamped or bent. They can simply be designed in a straight form, thereby reducing the design complexity and cost of the sampling assembly 202. At the same time, with the support of the protrusion 106, it can prevent abnormal problems such as loose electrical connections caused by vibration stress at the connection between the circuit board and the nickel sheet in the sampling assembly 202, thereby improving the reliability of the sampling assembly 202.

[0067] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A single battery cell, characterized in that: It includes a housing with openings at both ends, and cover plates disposed at both ends of the housing along its length, each cover plate being used to cover the opening on the corresponding side; The cover plate is provided with a positive terminal and a negative terminal, and a boss is provided between the positive terminal and the negative terminal. The boss is formed by protruding outward from the cover plate, and a groove corresponding to the boss is formed on the side of the cover plate facing the housing. A cell explosion-proof valve is provided on one side wall of the housing in the width direction.

2. The battery cell according to claim 1, characterized in that: Along the length of the housing, the cell explosion-proof valve is located in the middle of the housing; and / or, Another cover plate is provided with an injection hole.

3. A battery pack, characterized in that: Including battery cell packs; The battery cell assembly has several battery cell units as described in claim 1 or 2 arranged in sequence.

4. The battery pack according to claim 3, characterized in that: It also includes a tray and a top cover disposed on the tray, wherein the battery cell assembly is disposed within a cavity formed between the tray and the top cover.

5. The battery pack according to claim 4, characterized in that: In the battery cell assembly, the arrangement direction of each battery cell is the same as the thickness direction of any battery cell, and the battery cell explosion-proof valve of each battery cell is located at the top of the battery cell assembly; The top cover has a top cover and a frame on the side of the top cover facing the tray. The top cover is provided with an exhaust channel, and each of the cell explosion-proof valves is connected to the battery pack explosion-proof valve provided on the frame through the exhaust channel.

6. The battery pack according to claim 5, characterized in that: The top cover includes a first substrate and a second substrate connected together. The first substrate abuts against the top of the battery cell assembly, and the second substrate is located on the side of the first substrate away from the battery cell assembly. The exhaust channel is formed between the first substrate and the second substrate, and the first substrate is provided with vent holes that correspond to and communicate with the explosion-proof valves of each battery cell.

7. The battery pack according to claim 6, characterized in that: A sealing strip is provided between the first substrate and the battery cell assembly, and the sealing strip is provided with clearance holes that correspond one-to-one with each of the ventilation holes.

8. The battery pack according to claim 5, characterized in that: The battery cell group consists of at least two groups arranged along the length direction of any one of the battery cell units; The sides of two adjacent groups of battery cells with each injection hole are joined together, and / or the venting channel includes a first channel connected to the explosion-proof valve of each cell in each battery cell group, and a second channel connecting to each of the first channels, the second channel being connected to the explosion-proof valve of the battery pack.

9. The battery pack according to claim 5, characterized in that: An exhaust guide shroud is provided between the top cover and the frame, and an exhaust guide channel is formed between the exhaust guide shroud, the top cover, and the frame. The exhaust channel is connected to the battery pack explosion-proof valve through the exhaust guide channel.

10. The battery pack according to any one of claims 5 to 9, characterized in that: It also includes electrical components disposed within the cavity, a maintenance window corresponding to the electrical components provided on the frame, and a maintenance cover detachably disposed at the maintenance window; and / or, The battery cell assembly has end plates at both ends along the arrangement direction of each individual battery cell, and the top cover is screwed to each end plate.

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