Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses electric core and battery package. Electric core includes: electric core casing, is equipped with opening in Y direction on at least one end, pole group subassembly, assembles to electric core casing through opening, pole group subassembly, including pole group body and the insulating film of wrapping in the outside of pole group body, pole group subassembly has a pair of along X direction opposite setting big face and a pair of along Z direction opposite setting narrow side, a pair of U type clamping plate, the opposite two sides of pole group subassembly in Z direction are clamped, U type clamping plate includes a pair of side plate and the connecting plate of connecting a pair of side plate, and the connecting plate is inlaid with corresponding narrow side, a pair of connecting plate is located the opposite two sides of pole group subassembly in X direction, and is inlaid with corresponding big face. Through setting U type clamping plate in the opposite two sides of pole group subassembly in Z direction, can make insulating film closely inlaid on pole group body, reduce the volume of pole group subassembly, avoid insulating film in the process of pole group subassembly into shell and the interference of electric core casing.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cell and battery pack. Background Technology

[0002] To improve the safety of battery cells, an insulating film is usually wrapped around the outside of the internal electrode assembly to isolate the electrode assembly from the metal casing of the battery cell.

[0003] Specifically, the metal casing of a battery cell typically has an mounting port through which the electrode assembly, wrapped with an insulating film, can be assembled into the metal casing, thus completing the electrode assembly insertion process. However, due to manufacturing and conversion tolerances, the insulating film often cannot completely and tightly wrap the electrode assembly. Therefore, during the assembly process, interference can easily occur between the electrode assembly and the metal casing of the battery cell, leading to damage to the insulating film and affecting its insulation performance. Utility Model Content

[0004] This invention provides a battery cell and battery pack to solve the problem that the insulating film wrapped around the outside of the electrode assembly is easily damaged by interference with the metal casing of the battery cell during the electrode assembly insertion process.

[0005] In a first aspect, this utility model provides a battery cell, comprising: The battery cell casing has an opening at at least one end in the Y direction; The electrode assembly is assembled into the cell housing through the opening. The electrode assembly includes an electrode body and an insulating film wrapped around the outside of the electrode body. The electrode assembly has a pair of large surfaces arranged opposite each other along the X direction and a pair of narrow side surfaces arranged opposite each other along the Z direction. A pair of U-shaped clamping plates are respectively clamped to opposite sides of the electrode assembly in the Z direction; the U-shaped clamping plate includes a pair of side plates and a connecting plate connecting the pair of side plates, the connecting plate is in contact with the corresponding narrow side, and the pair of connecting plates are located on opposite sides of the electrode assembly in the X direction and are in contact with the corresponding large surface.

[0006] Beneficial effects: By setting U-shaped clamps on opposite sides of the electrode assembly in the Z direction, this utility model can ensure that the U-shaped clamps are relatively firmly set on the electrode assembly while applying sufficient pressure to the insulating film, so that the insulating film is tightly attached to the electrode assembly body, thereby reducing the volume of the electrode assembly and avoiding interference between the insulating film and the cell housing during the electrode assembly insertion process, thus ensuring the integrity of the insulating film and achieving effective isolation between the electrode assembly body and the cell housing.

[0007] In one optional implementation, the length of the side plate along the Z direction is D, and the value of D is in the range of 5mm≤D≤10mm.

[0008] Beneficial effects: This invention controls the length D of the side plate within the range of 5mm to 10mm, ensuring sufficient contact area between the side plate and the electrode assembly while preventing the side plate from excessively occupying the internal space of the cell casing and affecting the energy density of the cell. Furthermore, controlling the length D of the side plate within this range also reduces the amount of material used in the side plate, lowering production costs.

[0009] In one optional implementation, along the X direction, the thickness of the pole assembly is h, the distance between a pair of connecting plates is H, and the relationship between h and H satisfies: 0.2mm≤(Hh) / 2≤0.8mm, and the value range of h is 5mm≤h≤50mm.

[0010] Beneficial effects: If the lower limit of (Hh) / 2 is less than 0.2mm, it means that the distance H between a pair of connecting plates is too small. During the assembly of the U-shaped clamp onto the electrode assembly, the U-shaped clamp may damage the electrode assembly body and / or the insulating film. Furthermore, since the electrode assembly body expands during cell charging, a small value of H will limit the normal expansion space of the electrode assembly body, thus affecting the cycle life of the cell. Conversely, if the upper limit of (Hh) / 2 is greater than 0.8mm, it means that the distance H between a pair of connecting plates is too large. This reduces the force exerted by the U-shaped clamp on the electrode assembly. This not only increases the likelihood of the U-shaped clamp detaching from the electrode assembly but also prevents the insulating film from adhering closely to the electrode assembly body, thus failing to achieve the goal of reducing the size of the electrode assembly itself.

[0011] In one optional embodiment, along the Y direction, a gap L is left between the end of the U-shaped card plate and the corresponding end of the pole assembly, wherein the value of the gap L is in the range of 5mm≤L≤10mm.

[0012] Beneficial effects: If the lower limit of the spacing L is less than 5mm, it means that the distance between the end of the U-shaped clamp and the corresponding end of the electrode assembly is relatively small. Since the end of the electrode assembly also needs to be assembled and connected with other components of the cell (such as tabs, insulating pads, current collectors, etc.), if the spacing L is too small, it will compress the installation space of subsequent components, causing mutual squeezing and interference between components during assembly. On the other hand, if the upper limit of the spacing L is greater than 10mm, it means that the proportion of the U-shaped clamp on the narrow side of the electrode assembly is relatively small. In this case, the U-shaped clamp can only make the insulating film in a small area tightly adhere to the electrode body. As a result, the insulating film on the electrode body is still prone to interference with the cell housing during the electrode assembly insertion process.

[0013] In one optional embodiment, the connecting plate and the side plate have the same thickness, and along the Z direction, the thickness N of the connecting plate ranges from 0.3mm ≤ N ≤ 1mm.

[0014] Beneficial effects: This utility model controls the thickness N of the connecting plate to be between 0.3mm and 1mm, which can ensure that the U-shaped card has sufficient structural strength while avoiding excessive weight and space occupation of the U-shaped card, thereby achieving the purpose of adapting to the compact assembly environment inside the battery cell and reducing the amount of materials used.

[0015] In one optional embodiment, the U-shaped card plate includes a plurality of sub-U-shaped card plates, which are spaced apart along the Y direction.

[0016] Beneficial effects: The spaced sub-U-shaped clamps provide multi-point uniform constraint on the narrow sides of the electrode assembly. Compared to a monolithic U-shaped clamp, this design more precisely adapts to the structural characteristics of the electrode assembly, reduces local stress concentration, and prevents deformation of the electrode assembly or damage to the clamps due to excessive stress at a single point, further improving fixing reliability. Furthermore, the spacing between the sub-U-shaped clamps also forms heat dissipation channels, effectively dissipating the heat generated by the electrode assembly during operation, reducing the internal temperature of the cell, and preventing high temperatures from affecting cell performance and lifespan.

[0017] In one alternative embodiment, the U-shaped card plate is thermally fused to the insulating film for fixation.

[0018] Beneficial effects: Hot-melt bonding enables the two to form a tight bond at the molecular level. Compared with traditional adhesive or mechanical fixing methods, the connection strength is higher and the sealing is better. It can effectively prevent detachment or loosening caused by vibration and temperature changes during long-term use, ensure that the U-shaped card plate does not fail to fix the electrode assembly, and at the same time ensure that the insulating film continues to play its insulating role.

[0019] In one optional embodiment, the U-shaped card is made of polycarbonate, polyethylene, or polyethylene terephthalate.

[0020] Beneficial effects: Polycarbonate has high mechanical strength and outstanding impact resistance, which can stably withstand the assembly pressure of the electrode assembly and the vibration and impact during equipment operation, avoiding deformation or breakage of the U-shaped clamp; Polyethylene has good flexibility, which can reduce the rigid compression of components when adapting to electrode assemblies of different sizes, reducing the risk of electrode assembly damage; Polyethylene terephthalate has both certain strength and temperature resistance, which can adapt to the temperature fluctuations during the operation of the battery cell (usually able to withstand environments from -40℃ to 120℃), and will not soften due to high temperature or crack due to low temperature, ensuring the stability of the clamp's fixation on the electrode assembly.

[0021] In one alternative embodiment, the connection between the connecting plate and the side plate is provided with a transition fillet.

[0022] Beneficial effects: The transition fillet can disperse stress through a smooth curved surface transition, preventing the U-shaped clamp from cracking or breaking when subjected to deformation caused by the pressure of the pole assembly, equipment vibration or temperature changes, thereby improving the structural strength and service life of the U-shaped clamp and ensuring its long-term stable fixing function.

[0023] Secondly, this utility model also provides a battery pack, comprising: Box; Multiple of the aforementioned battery cells are arranged side by side inside the housing.

[0024] Beneficial effects: The battery pack of this utility model includes the battery cell as described above and has all the beneficial technical effects of the battery cell, which will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the assembly of a pole assembly and a U-shaped card plate according to an embodiment of the present utility model; Figure 2 This is an exploded view of a battery cell according to an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Cell housing; 2. Electrode assembly; 201. Electrode body; 202. Insulating film; 203. Large surface; 204. Narrow side surface; 3. U-shaped clamping plate; 301. Side plate; 302. Connecting plate; 303. Transition rounded corner. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] To address the problem that the insulating film wrapped around the outside of the electrode assembly is easily damaged by interference with the metal casing of the battery cell during the electrode assembly insertion process, this utility model provides a battery cell and battery pack.

[0030] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0031] According to embodiments of the present invention, on the one hand, such as Figure 1 and Figure 2 As shown, a battery cell is provided, including: a battery cell housing 1, an electrode assembly 2, and a pair of U-shaped clamps 3.

[0032] Specifically, the cell housing 1 has an opening at at least one end in the Y direction; the electrode assembly 2 is assembled into the cell housing 1 through the opening. The electrode assembly 2 includes an electrode body 201 and an insulating film 202 wrapped around the outside of the electrode body 201. The electrode assembly 2 has a pair of large surfaces 203 arranged opposite each other in the X direction and a pair of narrow side surfaces 204 arranged opposite each other in the Z direction; a pair of U-shaped clamping plates 3 are respectively clamped on opposite sides of the electrode assembly 2 in the Z direction; the U-shaped clamping plate 3 includes a pair of side plates 301 and a connecting plate 302 connecting the pair of side plates 301. The connecting plate 302 is in contact with the corresponding narrow side surface 204. The pair of connecting plates 302 are located on opposite sides of the electrode assembly 2 in the X direction and are in contact with the corresponding large surfaces 203.

[0033] This embodiment of the invention provides U-shaped clamping plates 3 on opposite sides of the electrode assembly 2 in the Z direction. This ensures that the U-shaped clamping plates 3 are relatively firmly mounted on the electrode assembly 2 while applying sufficient pressure to the insulating film 202, so that the insulating film 202 is tightly attached to the electrode body 201. This reduces the volume of the electrode assembly 2 and prevents the insulating film 202 from interfering with the cell housing 1 during the insertion of the electrode assembly 2 into the housing. This ensures the integrity of the insulating film 202 and achieves effective isolation between the electrode body 201 and the cell housing 1.

[0034] Specifically, the battery cell in this embodiment may be cylindrical, cuboid, or other shapes, and this application embodiment is not limited in this respect. Figure 1 This is an example of a cuboid-shaped battery cell.

[0035] Specifically, the electrode assembly body 201 in this embodiment includes a plurality of alternately arranged positive and negative electrode plates and an insulating member disposed between the positive and negative electrode plates.

[0036] Specifically, the positive electrode sheet includes a positive current collector and a positive active material disposed on at least one surface of the positive current collector. As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the opposite surfaces of the positive current collector. As an example, the positive current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector can include a polymeric material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymeric material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0037] Specifically, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector. As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the opposite surfaces of the negative electrode current collector. As an example, the negative electrode current collector may be a metal foil, foamed metal, or a composite current collector. For example, as a metal foil, silver-surfaced aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0038] Specifically, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected. As an example, the main material of the separator membrane can be selected from at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0039] Furthermore, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0040] Specifically, such as Figure 2 As shown, the angle between the side plate 301 and the connecting plate 302 is 90 degrees or slightly less than 90 degrees. It can be understood that when the angle between the side plate 301 and the connecting plate 302 is 90 degrees, the side plate 301 and the connecting plate 302 can better fit against the narrow side surface 204 and the large surface 203 of the pole assembly 2, increasing the contact area between the U-shaped clamping plate 3 and the pole assembly 2. Setting the angle between the side plate 301 and the connecting plate 302 to an acute angle less than 90 degrees means that from the end of the side plate 301 closest to the connecting plate 302 to the end of the side plate 301 furthest from the connecting plate 302, the ends of the pair of side plates 301 furthest from the connecting plate 302 are tilted towards each other. In this case, the pair of side plates 301 can exert a greater force on the pole assembly 2, making the U-shaped clamping plate 3 more stably mounted on the pole assembly 2. Preferably, the U-shaped card plate 3 can be made of a material with a certain elastic deformation, so as to avoid the U-shaped card plate 3 from damaging the insulating film 202 on the electrode assembly body 201.

[0041] In one embodiment, such as Figure 1 As shown, along the Z direction, the length of the side plate 301 is D, and the value of D ranges from 5mm to 10mm. It can be understood that by controlling the length D of the side plate 301 within the range of 5mm to 10mm in this embodiment of the invention, sufficient contact area between the side plate 301 and the electrode assembly 2 is ensured while avoiding excessive occupation of the internal space of the cell housing 1 by the side plate 301, which could affect the energy density of the cell. Furthermore, controlling the length D of the side plate 301 within the aforementioned range also reduces the material usage of the side plate 301, thereby lowering production costs.

[0042] It is understood that the value of D in this embodiment can be, but is not limited to, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or any value range between the two.

[0043] In one embodiment, such as Figure 2As shown, along the X direction, the thickness of the electrode assembly 2 is h, and the distance between a pair of connecting plates 302 is H. The relationship between h and H satisfies: 0.2mm ≤ (Hh) / 2 ≤ 0.8mm, and the value range of h is 5mm ≤ h ≤ 50mm. It can be understood that if the lower limit of (Hh) / 2 is less than 0.2mm, it means that the distance H between the pair of connecting plates 302 is too small. Therefore, during the assembly of the U-shaped clamping plate 3 onto the electrode assembly 2, the U-shaped clamping plate 3 may damage the electrode body 201 and / or the insulating film 202. Furthermore, since the volume of the electrode body 201 expands during cell charging, a small value of H will also limit the normal expansion space of the electrode body 201, thus affecting the cycle life of the cell. If the upper limit of (Hh) / 2 is greater than 0.8mm, it means that the distance H between a pair of connecting plates 302 is too large. This will reduce the force exerted by the U-shaped card plate 3 on the pole assembly 2. In this way, not only will the possibility of the U-shaped card plate 3 falling off the pole assembly 2 be increased, but the insulating film 202 will also be unable to adhere to the pole body 201, thus failing to achieve the purpose of reducing the volume of the pole assembly 2 itself.

[0044] It is understood that the value of (Hh) / 2 can be, but is not limited to, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm or any value between two of these; similarly, in this embodiment, the value of h can be, but is not limited to, 5mm, 6mm, 7mm, 7.5mm, 8mm, 9mm, 10mm, 11mm, 15mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 31mm, 34mm, 35mm, 37mm, 39mm, 40mm, 41mm, 43mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm or any value between two of these.

[0045] In one embodiment, such as Figure 1As shown, along the Y direction, there is a gap L between the end of the U-shaped clamping plate 3 and the corresponding end of the pole assembly 2. The value of gap L is in the range of 5mm ≤ L ≤ 10mm. It can be understood that if the lower limit of gap L is less than 5mm, it means that the distance between the end of the U-shaped clamping plate 3 and the corresponding end of the pole assembly 2 is relatively small. Since the end of the pole assembly 2 also needs to be assembled and connected with other components of the cell (such as tabs, insulating pads, current collectors, etc.), if the value of gap L is too small, it will compress the installation space of subsequent components, resulting in mutual squeezing and interference between components during assembly. On the other hand, if the upper limit of gap L is greater than 10mm, it means that the proportion of the U-shaped clamping plate 3 on the narrow side 204 of the pole assembly 2 is relatively small. In this case, the U-shaped clamping plate 3 can only make the insulating film 202 in a small area tightly adhere to the pole body 201. As a result, the insulating film 202 on the pole body 201 is still prone to interference with the cell housing 1 during the installation of the pole assembly 2.

[0046] It is understood that the value of L in this embodiment can be, but is not limited to, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or any value between the two.

[0047] In one embodiment, such as Figure 2 As shown, the connecting plate 302 and the side plate 301 have the same thickness. Along the Z direction, the thickness N of the connecting plate 302 ranges from 0.3mm to 1mm. This embodiment of the invention controls the thickness N of the connecting plate 302 between 0.3mm and 1mm, ensuring sufficient structural strength for the U-shaped clamping plate 3 while avoiding excessive weight and space occupation. This achieves the goal of adapting to the compact assembly environment inside the battery cell and reducing material usage.

[0048] It is understood that the value of N in this embodiment can be, but is not limited to, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm or any value range between the two.

[0049] In one embodiment, the U-shaped clamp 3 includes multiple sub-U-shaped clamps, which are spaced apart along the Y direction. It can be understood that the spaced sub-U-shaped clamps can provide multi-point uniform constraint on the narrow side 204 of the electrode assembly 2. Compared to the integral U-shaped clamp 3, this allows for a more precise fit to the structural characteristics of the electrode assembly 2, reducing local stress concentration and preventing deformation of the electrode assembly 2 or damage to the clamp due to excessive force at a single point, thus further improving fixing reliability. Furthermore, the spacing between the sub-U-shaped clamps can also form heat dissipation channels, dissipating the heat generated by the electrode assembly 2 during operation, effectively reducing the internal temperature of the battery cell, and preventing high temperatures from affecting the battery cell's performance and lifespan.

[0050] In one embodiment, the U-shaped clamp 3 and the insulating film 202 are heat-fused and fixedly connected. It is understood that the heat-fused connection enables the two to form a tight bond at the molecular level. Compared with traditional adhesive or mechanical fixing methods, the connection strength is higher and the sealing performance is better. It can effectively prevent detachment or loosening caused by vibration and temperature changes during long-term use, ensuring that the fixing effect of the U-shaped clamp 3 on the electrode assembly 2 does not fail, while also ensuring that the insulating film 202 continues to play its insulating role.

[0051] In one embodiment, the U-shaped clamp 3 is made of polycarbonate, polyethylene, or polyethylene terephthalate. Polycarbonate has high mechanical strength and outstanding impact resistance, and can stably withstand the assembly pressure of the electrode assembly 2 and the vibration and impact during equipment operation, preventing the U-shaped clamp 3 from deforming or breaking. Polyethylene has good flexibility, which can reduce the rigid compression of components when adapting to electrode assemblies 2 of different sizes, reducing the risk of damage to the electrode assembly 2. Polyethylene terephthalate has both certain strength and temperature resistance, and can adapt to the temperature fluctuations during the operation of the battery cell (typically able to withstand environments from -40°C to 120°C), without softening due to high temperatures or cracking due to low temperatures, ensuring the stability of the clamp's fixation to the electrode assembly 2.

[0052] In one embodiment, such as Figure 1 and Figure 2 As shown, a transition fillet 303 is provided at the connection between the connecting plate 302 and the side plate 301. It can be understood that the transition fillet 303 can disperse stress through a smooth curved surface transition, avoiding cracking, breakage and other damage to the U-shaped clamp 3 when subjected to deformation caused by pressure from the pole assembly 2, equipment vibration or temperature changes, thereby improving the structural strength and service life of the U-shaped clamp 3 and ensuring its long-term stable fixing function.

[0053] According to an embodiment of the present invention, another aspect provides a battery pack, comprising: a housing and a plurality of the aforementioned battery cells.

[0054] Specifically, multiple of the aforementioned battery cells are arranged side by side inside the enclosure.

[0055] The battery pack of this utility model embodiment includes the battery cell described above, and has all the beneficial technical effects of the battery cell, which will not be repeated here.

[0056] Specifically, in this embodiment, multiple battery cells are connected in series, parallel, or mixed via a busbar component.

[0057] Specifically, in this embodiment, the box body can be part of the vehicle's chassis structure. For example, a portion of the box body can be at least a part of the vehicle's floor, or a portion of the box body can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0058] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: The battery cell casing has an opening at at least one end in the Y direction; The electrode assembly is assembled into the cell housing through the opening. The electrode assembly includes an electrode body and an insulating film wrapped around the outside of the electrode body. The electrode assembly has a pair of large surfaces arranged opposite each other along the X direction and a pair of narrow side surfaces arranged opposite each other along the Z direction. A pair of U-shaped clamping plates are respectively clamped to opposite sides of the electrode assembly in the Z direction; the U-shaped clamping plate includes a pair of side plates and a connecting plate connecting the pair of side plates, the connecting plate is in contact with the corresponding narrow side, and the pair of connecting plates are located on opposite sides of the electrode assembly in the X direction and are in contact with the corresponding large surface.

2. The battery cell according to claim 1, characterized in that, Along the Z direction, the length of the side plate is D, and the value of D is in the range of 5mm≤D≤10mm.

3. The battery cell according to claim 1, characterized in that, Along the X direction, the thickness of the pole assembly is h, and the distance between a pair of connecting plates is H. The relationship between h and H satisfies: 0.2mm≤(Hh) / 2≤0.8mm, and the value range of h is 5mm≤h≤50mm.

4. The battery cell according to claim 1, characterized in that, Along the Y direction, there is a gap L between the end of the U-shaped card plate and the corresponding end of the pole assembly, and the value of the gap L is in the range of 5mm≤L≤10mm.

5. The battery cell according to claim 1, characterized in that, The connecting plate and the side plate have the same thickness. Along the Z direction, the thickness N of the connecting plate ranges from 0.3mm to 1mm.

6. The battery cell according to claim 1, characterized in that, The U-shaped card plate includes multiple sub-U-shaped card plates, which are spaced apart along the Y direction.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The U-shaped card plate is fixedly connected to the insulating film by heat fusion.

8. The battery cell according to any one of claims 1 to 6, characterized in that, The U-shaped card is made of polycarbonate, polyethylene, or polyethylene terephthalate.

9. The battery cell according to any one of claims 1 to 6, characterized in that, The connection between the connecting plate and the side plate is provided with a transition rounded corner.

10. A battery pack, characterized in that, include: Box; The battery cells according to any one of claims 1 to 9 are arranged side by side in the housing.

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