Battery pack and battery system

Abstract

The utility model relates to a battery pack and a battery system. A battery cell group in the battery pack comprises at least two single battery cells; the first isolation assembly comprises at least one first isolation piece, and the at least one first isolation piece is arranged between two adjacent single battery cells based on a first direction; the second isolation assembly comprises at least two second isolation pieces, and the at least two second isolation pieces are arranged between the two adjacent single battery cells based on the second direction; wherein one second isolation piece is jointed with the first end of the first isolation piece, and the other second isolation piece is jointed with the second end of the corresponding first isolation piece, so that the first isolation piece and the second isolation piece are arranged between the adjacent single battery cells, and an expansion space is formed between the adjacent single battery cells; the risk that glue overflows into the expansion space in the expansion process of the battery pack is reduced, so that the battery cell is uniformly stressed in the charge-discharge expansion process, the lithium precipitation risk in the battery cell circulation process is reduced, and the cycle life of the battery pack is prolonged.

Description

Technical Field

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

[0002] A battery pack consists of several cells. During charging and discharging, the battery may expand. In order to reduce the risk of battery expansion and compression, an insulating material is placed between two adjacent cells to form an expansion space at the interface between the cells.

[0003] Currently, in existing battery packs, when adhesive is applied to the bottom or sides of the cells, it can easily overflow into the expansion space between the cells. After the adhesive cures, it causes uneven stress on the cells during charging and discharging, which can easily lead to local lithium plating and abnormal expansion during battery pack cycling. Utility Model Content

[0004] Based on this, a battery pack and a battery system are provided.

[0005] In a first aspect, this application provides a battery pack, comprising:

[0006] A battery cell assembly, which includes at least two individual battery cells;

[0007] The first isolation component includes at least one first isolation member, which is disposed between two adjacent individual cells based on a first direction.

[0008] The second isolation assembly includes at least two second isolation members disposed between two adjacent individual cells in a second direction; one of the second isolation members is engaged with a first end of a first isolation member, and the other second isolation member is engaged with a second end of a corresponding first isolation member.

[0009] In one embodiment, a first chamfered portion is provided at the first end of the first isolation member, a second chamfered portion is provided at the second end of the second isolation member, a third chamfered portion is provided at one end of one of the second isolation members, and a fourth chamfered portion is provided at one end of the other second isolation member.

[0010] The first cut corner joins the third cut corner, and the second cut corner joins the fourth cut corner.

[0011] In one embodiment, the first isolator is disposed near the bottom edge of the bonding surface of the corresponding individual cell, and the second isolator is disposed near the side edge of the bonding surface of the corresponding individual cell.

[0012] In one embodiment, the angle of the first chamfered portion is greater than 0 and less than 90 degrees; the angle of the second chamfered portion is greater than 0 and less than 90 degrees.

[0013] In one embodiment, the length of the first separator is less than the bottom edge length of the corresponding single cell bonding surface, and the first chamfered portion avoids the R-angle of the corresponding single cell bonding surface, and the second chamfered portion avoids the R-angle of the corresponding single cell bonding surface.

[0014] In one embodiment, the distance from the first insulating member to the bottom edge of the corresponding single cell bonding surface is between 3 and 5 millimeters;

[0015] The distance between the second isolator and the side of the corresponding cell bonding surface is between 3 and 5 millimeters.

[0016] In one embodiment, the first spacer is more flexible than the second spacer.

[0017] In one embodiment, the width of the first spacer is between 5 and 10 millimeters; the width of the second spacer is between 5 and 20 millimeters.

[0018] In one embodiment, the battery pack further includes a third isolation component, which includes at least one third isolation member disposed between two adjacent individual cells based on a first direction; the third isolation member is disposed adjacent to the top edge of the bonding surface of the corresponding individual cell.

[0019] The first end of the third spacer engages with one of the second spacers, and the second end of the third spacer engages with the other second spacer.

[0020] Secondly, this application provides a battery system including a battery pack as described in any of the above.

[0021] One of the above technical solutions has the following advantages and beneficial effects:

[0022] The aforementioned battery pack includes a cell assembly, a first isolation assembly, and a second isolation assembly. The cell assembly includes at least two individual cells. The first isolation assembly includes at least one first isolation member, which is disposed between two adjacent individual cells based on a first direction. The second isolation assembly includes at least two second isolation members, which are disposed between two adjacent individual cells based on a second direction. One of the second isolation members is engaged with the first end of the first isolation member, and the other second isolation member is engaged with the second end of the corresponding first isolation member, thereby realizing the placement of the first and second isolation members between adjacent individual cells to form an expansion space between adjacent individual cells. This application connects the first end of the first separator to one of the second separators, and the second end of the first separator to the other second separator, thereby forming an expansion space by the first and second separators. When glue is applied to the bottom or sides of the battery cell in the battery pack, glue can be prevented from overflowing into the expansion space, reducing the risk of glue overflowing into the expansion space during the expansion of the battery pack. This ensures that the battery cell is subjected to uniform force during the charging and discharging expansion process, reduces the risk of lithium plating during the battery cell cycle process, and thus improves the cycle life of the battery pack. Attached Figure Description

[0023] Figure 1 This is a first installation diagram of the battery pack in an embodiment of this application;

[0024] Figure 2 This is a second installation diagram of the battery pack in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the first structure of the battery pack in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the second structure of the battery pack in an embodiment of this application.

[0027] Figure label:

[0028] 10. Cell assembly; 110. Individual cell; 20. First isolation assembly; 210. First isolation element; 212. First chamfered portion; 214. Second chamfered portion; 30. Second isolation assembly; 310. Second isolation element; 312. Third chamfered portion; 314. Fourth chamfered portion; 40. Third isolation assembly; 410. Third isolation element. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover inclusions not explicitly listed. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] In addition, the term "multiple" should mean two or more.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] During the cell assembly process in battery packs, thermally conductive structural adhesive is applied between the bottom of the cell and the liquid cooling plate to enhance the structural strength and thermal conductivity of the cells, and expanding foam is injected into the sides of the cells. Traditional battery packs typically use an integrated U-shaped frame between adjacent cells to prevent adhesive overflow at the bottom and sides. However, the cutting process of this integrated U-shaped frame is prone to material waste and high cost. Furthermore, as the cell expands to its final stage, the integrated U-shaped frame compresses to its limit, resulting in significant stress at the bottom, pressing against the electrode plates and affecting the normal expansion during charging and discharging. Additionally, traditional battery packs also use strip-type U-shaped frames between adjacent cells, but this requires high precision in the manufacturing process. To ensure the strip-type U-shaped frames do not overlap, a certain tolerance is needed, which can easily lead to large gaps in the frames, increasing the risk of adhesive overflow at the bottom and sides of the cells. Once the adhesive overflowing into the strip-type U-shaped frame cures, the localized stress during the cell's expansion during charging and discharging is high, leading to abnormal expansion during cycling and causing lithium plating.

[0036] In the battery pack of this application, by providing at least one first separator and at least two second separators between two adjacent individual cells, more expansion space can be provided, and the gap between the first separator and the second separator can be reduced, thereby reducing the risk of glue overflow between two adjacent cells, thus reducing the risk of lithium plating, and reducing costs.

[0037] In one embodiment, such as Figures 1 to 3 As shown, a battery pack is provided, including a cell assembly 10, a first isolation component 20, and a second isolation component 30. The cell assembly 10 includes at least two individual cells 110. The first isolation component 20 includes at least one first isolation member 210, which is disposed between two adjacent individual cells 110 based on a first direction. The second isolation component 30 includes at least two second isolation members 310, which are disposed between two adjacent individual cells 110 based on a second direction. One of the second isolation members 310 is engaged with a first end of the first isolation member 210, and the other second isolation member 310 is engaged with a second end of the corresponding first isolation member 210.

[0038] The battery pack can be a CTP (Cell To Pack) battery pack. The cell assembly 10 includes at least two individual cells 110 connected in series and / or parallel; the individual cells 110 can be, but are not limited to, lithium-ion cells; for example, the individual cells can be lithium iron phosphate cells, ternary lithium cells, or lithium manganese iron phosphate cells. The individual cells 110 can also be lithium metal cells or sodium-ion cells. The individual cells 110 can have a square structure, for example, each individual cell 110 can be arranged in one row and multiple columns or multiple rows and multiple columns. For example, the individual cell 110 has four sides, which can be divided into two larger sides (i.e., large sides) and two smaller sides (i.e., small sides), with the corresponding large sides of two adjacent individual cells 110 arranged close together.

[0039] The first isolation member 210 may be elongated, and its first direction may be horizontal. For example, the first isolation member 210 may be arranged parallel to the bottom edge of the contact surface of the corresponding individual cell 110. At least one first isolation member 210 may be provided between two adjacent individual cells 110. For example, one first isolation member 210 may be arranged horizontally between two adjacent individual cells 110. The first isolation member 210 may be provided between two adjacent individual cells 110 by adhesive bonding.

[0040] The second spacer 310 may be elongated, and the second direction may be vertical. For example, the second spacer 310 may be arranged parallel to the side of the contact surface of the corresponding individual cell 110. At least two second spacers 310 may be provided between two adjacent individual cells 110. For example, two second spacers 310 may be vertically arranged between two adjacent individual cells 110. The two second spacers 310 may be provided between two adjacent individual cells 110 by adhesive bonding, and the two second spacers 310 may be arranged with relative spacing.

[0041] For example, the first end of the first separator 210 is joined to one end of one of the second separators 310, and the second end of the first separator 210 is joined to one end of the other second separator 310. This allows the first separator 210, the two second separators 310, and the contact surfaces of the two adjacent individual cells 110 to form a U-shaped expansion space, thereby creating a larger expansion space between the two adjacent cells. By joining the first end of the first separator 210 to one end of one of the second separators 310, the gap at the joint between the first separator 210 and the second separator 310 is reduced. This prevents adhesive from entering the expansion space from the joint between the first separator 210 and the second separator 310 when applying adhesive to the bottom or sides of the cells in the battery pack. By joining the second end of the first separator 210 to one end of the other second separator 310, the gap at the joint between the first separator 210 and the other second separator 310 is reduced. This prevents glue from entering the expansion space from the joint between the first separator 210 and the other second separator 310 when applying glue to the bottom or side of the battery cell in the battery pack. This reduces the risk of glue overflowing into the expansion space during the expansion of the battery pack, ensuring uniform stress during the charging and discharging expansion of the battery cell and reducing the risk of lithium plating during the battery cell cycling process.

[0042] In the above embodiments, at least one first isolation member 210 is disposed between two adjacent individual cells 110 based on a first direction, and at least two second isolation members 310 are disposed between two adjacent individual cells 110 based on a second direction; one of the second isolation members 310 is engaged with the first end of the first isolation member 210, and the other second isolation member 310 is engaged with the second end of the corresponding first isolation member 210, thereby realizing the placement of the first isolation member 210 and the second isolation member 310 between adjacent individual cells 110 to form an expansion space between adjacent individual cells 110. This application connects the first end of the first separator 210 to one of the second separators 310, and the second end of the first separator 210 to the other second separator 310, thereby forming an expansion space by the first separator 210 and the second separator 310. When glue is applied to the bottom or side of the battery cell in the battery pack, glue can be prevented from overflowing into the expansion space, reducing the risk of glue overflowing into the expansion space during the expansion of the battery pack. This makes the force uniform during the expansion of the battery cell during charging and discharging, reduces the risk of lithium plating during the battery cell cycle, and thus improves the cycle life of the battery pack.

[0043] In one embodiment, such as Figures 1 to 3As shown, the first end of the first isolation member 210 is provided with a first chamfered portion 212, the second end of the second isolation member 310 is provided with a second chamfered portion 214, one end of one second isolation member 310 is provided with a third chamfered portion 312, and one end of the other second isolation member 310 is provided with a fourth chamfered portion 314; the first chamfered portion 212 is engaged with the third chamfered portion 312, and the second chamfered portion 214 is engaged with the fourth chamfered portion 314.

[0044] The first chamfered portion 212 can be obtained by cutting the first end of the first isolation member 210 at an angle; the second chamfered portion 214 can be obtained by cutting the second end of the first isolation member 210 at an angle; the third chamfered portion 312 can be obtained by cutting one end of the second isolation member 310 at an angle; and the fourth chamfered portion 314 can be obtained by cutting one end of another second isolation member 310 at an angle.

[0045] For example, the first spacer 210 is bonded to the mating surface between two adjacent individual cells 110. The first chamfered portion 212 of the first spacer 210 is positioned with the third chamfered portion 312 of the second spacer 310, so that the first chamfered portion 212 and the third chamfered portion 312 engage. The second chamfered portion 214 of the first spacer 210 is positioned with the fourth chamfered portion 314 of another second spacer 310, so that the second chamfered portion 214 and the fourth chamfered portion 314 engage. This reduces the gap at the joint between the first spacer 210 and the corresponding second spacer 310. When applying glue to the bottom or side of the cells of the battery pack, glue can be prevented from entering the expansion space from the joint between the first spacer 210 and the corresponding second spacer 310, reducing the risk of glue overflowing into the expansion space during the expansion of the battery pack. At the same time, it facilitates the bonding and positioning of the first spacer 210 and the second spacer 310, improving the ease of installation.

[0046] In one embodiment, such as Figure 1 and Figure 2 As shown, the first isolation member 210 is disposed near the bottom edge of the bonding surface of the corresponding single cell 110, and the second isolation member 310 is disposed near the side edge of the bonding surface of the corresponding single cell 110.

[0047] Among them, the bonding surface of a single cell 110 refers to the side of the cell that is bonded to the first separator 210 in two adjacent single cells 110, and the bonding surface of a single cell 110 is the corresponding large side of the single cell 110.

[0048] In one example, the distance from the bottom edge of the first isolator 210 to the bonding surface of the corresponding individual cell 110 is between 3 and 5 mm; the distance from the side edge of the second isolator 310 to the bonding surface of the corresponding individual cell 110 is between 3 and 5 mm. For example, the distance from the bottom edge of the first isolator 210 to the bonding surface of the corresponding individual cell 110 can be set to 3 mm, 4 mm, or 5 mm; the distance from the side edge of the second isolator 310 to the bonding surface of the corresponding individual cell 110 can be set to 3 mm, 4 mm, or 5 mm. Exemplarily, the distance from the bottom edge of the first isolator 210 to the bonding surface of the corresponding individual cell 110 is equal to the distance from the side edge of the second isolator 310 to the bonding surface of the corresponding individual cell 110.

[0049] For example, by setting the first isolation member 210 on the bottom edge of the bonding surface adjacent to the corresponding single cell 110, setting one of the second isolation members 310 on one side of the bonding surface adjacent to the corresponding single cell 110, setting the other second isolation member 310 on the other side of the bonding surface adjacent to the corresponding single cell 110, and joining the first end of the first isolation member 210 with one end of the corresponding second isolation member 310, and joining the second end of the second isolation member 310 with one end of the other second isolation member 310, the U-shaped expansion space formed by the bonding surfaces of the first isolation member 210, the two second isolation members 310, and the two adjacent single cells 110 can be increased, which helps to reduce the risk of squeezing deformation caused by cell expansion; when applying glue to the bottom of the cell of the battery pack or injecting glue to the side of the cell, glue can be prevented from entering the expansion space from the joint between the first isolation member 210 and the corresponding second isolation member 310, reducing the risk of glue overflowing into the expansion space during the expansion of the battery pack, and reducing the risk of lithium plating during the cell cycling process.

[0050] In one embodiment, the angle of the first chamfered portion 212 is greater than 0 and less than 90 degrees; the angle of the second chamfered portion 214 is greater than 0 and less than 90 degrees.

[0051] The angle of the first chamfered portion 212 refers to the angle between the cut edge and the long side of the first spacer 210; the angle of the second chamfered portion 214 refers to the angle between the cut edge and the long side of the first spacer 210. For example, the angle of the third chamfered portion 312 can be greater than 0 and less than 90 degrees; the angle of the fourth chamfered portion 314 can be greater than 0 and less than 90 degrees. The angle of the third chamfered portion 312 refers to the angle between the cut edge and the long side of the corresponding second spacer 310; the angle of the fourth chamfered portion 314 refers to the angle between the cut edge and the long side of another second spacer 310.

[0052] The sum of the angles of the first chamfered portion 212 and the third chamfered portion 312 can be between 80 and 100 degrees. For example, the sum of the angles of the first chamfered portion 212 and the third chamfered portion 312 can be 90 degrees. For example, the first chamfered portion 212 is set to 45 degrees and the third chamfered portion 312 is set to 45 degrees, which facilitates the joining of the first chamfered portion 212 and the third chamfered portion 312. The process tolerance at the joint is higher, and gaps are less likely to be generated during the joining process between the first separator 210 and the second separator. Thus, when applying glue to the bottom of the battery cell or pouring glue to the side of the battery cell, glue can be prevented from entering the expansion space from the joint between the first separator 210 and the corresponding second separator 310, reducing the risk of glue overflowing into the expansion space during the expansion process of the battery pack.

[0053] In one embodiment, such as Figure 3 As shown, the length of the first isolation member 210 is less than the bottom edge length of the bonding surface of the corresponding single cell 110, and the first chamfered portion 212 avoids the R-angle of the bonding surface of the corresponding single cell 110, and the second chamfered portion 214 avoids the R-angle of the bonding surface of the corresponding single cell 110.

[0054] The radius (R) of the bonding surface of the individual battery cell 110 refers to the lower left or lower right corner of the bonding edge of the individual battery cell 110. The radius (R) of the bonding surface of the individual battery cell 110 can be an arc-shaped angle.

[0055] By setting the length of the first isolation member 210 to be less than the bottom edge length of the corresponding single cell 110 bonding surface, the first isolation member 210 can be centered adjacent to the bottom edge of the corresponding single cell 110 bonding surface, so that the first chamfered portion 212 of the first isolation member 210 avoids the R-angle of the corresponding single cell 110 bonding surface, and the second chamfered portion 214 of the second isolation member 310 avoids the R-angle of the corresponding single cell 110 bonding surface, thereby avoiding or reducing the risk of cell breakage due to impact or compression, reducing the risk of lithium plating at the bottom of the cell, and making the battery pack safer and more reliable.

[0056] In one embodiment, the softness of the first isolation member 210 is greater than that of the second isolation member 310.

[0057] For example, the first spacer 210 can be made of foam with high softness, while the second spacer 310 can be made of foam with low softness. In an example configuration, the second spacer 310 can be made of XPP (extruded polypropylene) or MPP (microporous foamed polypropylene); the first spacer 210 can be made of silicone or similar materials.

[0058] By using a softer material, the first insulating element 210 is placed at the bottom of the bonding surface of the corresponding single cell 110, which reduces the stress on the first insulating element 210 and makes the electrode almost unaffected. The first insulating element 210 provides more expansion space for the corresponding single cell 110, effectively improving the cell cycle.

[0059] In one embodiment, the width of the first spacer 210 is between 5 and 10 mm; the width of the second spacer 310 is between 5 and 20 mm.

[0060] For example, the first isolation member 210 is set to 5 mm and the second isolation member 310 is set to 10 mm; or, for example, the first isolation member 210 is set to 10 mm and the second isolation member 310 is set to 20 mm. It should be noted that the width of the first isolation member 210 and the second isolation member 310 can be determined according to the large side dimension of the corresponding single cell 110.

[0061] By adjusting the widths of the first separator 210 and the second separator 310, the first separator 210 and the second separator 310 are positioned between two adjacent individual cells 110. The first separator 210 and the corresponding second separator 310 are joined to form a larger U-shaped expansion space. This avoids the first separator 210 and the second separator 310 being too wide, resulting in an insufficient U-shaped expansion space. Furthermore, it avoids the first separator 210 and the second separator 310 being too narrow, which would affect the sealing performance of the contact surfaces between the first separator 210 and the corresponding individual cell 110, as well as the sealing performance of the second separator 310 and the corresponding individual cell 110. This reduces the risk of adhesive overflowing into the expansion space during battery pack expansion, ensuring uniform stress distribution during cell charging and discharging expansion, reducing the risk of lithium plating during cell cycling, and thus improving the cycle life of the battery pack.

[0062] In one embodiment, such as Figure 4 As shown, the battery pack also includes a third isolation component 40, which includes at least one third isolation member 410. The at least one third isolation member 410 is disposed between two adjacent individual cells 110 based on a first direction. The third isolation member 410 is disposed adjacent to the top edge of the mating surface of the corresponding individual cell 110. The first end of the third isolation member 410 is engaged with one of the second isolation members 310, and the second end of the third isolation member 410 is engaged with the other second isolation member 310.

[0063] The third isolation member 410 may be elongated, for example, the third isolation member 410 may be arranged parallel to the top edge of the contact surface of the corresponding single cell 110. At least one third isolation member 410 may be provided between two adjacent single cells 110, for example, one third isolation member 410 may be arranged horizontally between two adjacent single cells 110. The third isolation member 410 may be provided between two adjacent single cells 110 by adhesive bonding.

[0064] For example, by joining the first end of the third separator 410 to the other end of one of the second separators 310, and joining the second end of the third separator 410 to the other end of the other second separator 310, the third separator 410, the first separator 210, the two second separators 310, and the bonding surfaces of the two adjacent individual cells 110 form a U-shaped expansion space, thereby enhancing the airtightness of the expansion space. By joining the first separator 210 to one end of the corresponding second separator 310, and the third separator 410 to the other end of the corresponding second separator 310, when applying adhesive to the bottom or sides of the cells in the battery pack, it is prevented that adhesive will enter the expansion space from the joint between the first separator 210 and the corresponding second separator 310, and also prevent adhesive from entering the expansion space from the joint between the third separator 410 and the corresponding second separator 310. This further reduces the risk of adhesive overflowing into the expansion space during the battery pack expansion process, ensuring uniform stress during cell charging and discharging expansion and reducing the risk of lithium plating during cell cycling.

[0065] In one embodiment, a battery system is also provided, comprising a battery pack as described in any of the above.

[0066] For a detailed description of the battery pack, please refer to the specific description of the battery pack in the above embodiments, which will not be repeated here.

[0067] The battery system includes a battery pack, which includes a cell assembly, a first isolation component, and a second isolation component. The cell assembly includes at least two individual cells. By placing at least one first isolation component between two adjacent individual cells in a first direction, and at least two second isolation components between two adjacent individual cells in a second direction, one of the second isolation components is engaged with the first end of the first isolation component, and the other second isolation component is engaged with the second end of the corresponding first isolation component, the first and second isolation components are placed between adjacent individual cells to form an expansion space between them. When glue is applied to the bottom or sides of the cells in the battery pack, glue can be prevented from overflowing into the expansion space, reducing the risk of glue overflowing into the expansion space during the expansion of the battery pack. This ensures uniform stress distribution during the charge and discharge expansion of the cells, reduces the risk of lithium plating during cell cycling, and thus improves the cycle life of the battery pack.

[0068] It should be noted that the battery system may also include components such as BMS (Battery Management System). A specific battery system may include more components than those described in the above embodiments, or combine certain components, or have different component arrangements.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, include: A battery cell assembly, wherein the battery cell assembly comprises at least two individual battery cells; A first isolation component, comprising at least one first isolation element, wherein the at least one first isolation element is disposed between two adjacent individual cells based on a first direction; The second isolation assembly includes at least two second isolation members disposed between two adjacent individual cells in a second direction; one of the second isolation members is engaged with a first end of the first isolation member, and the other second isolation member is engaged with a second end of the corresponding first isolation member.

2. The battery pack according to claim 1, characterized in that, The first isolation member has a first chamfered portion at its first end, the second isolation member has a second chamfered portion at its second end, one of the second isolation members has a third chamfered portion at one end, and the other second isolation member has a fourth chamfered portion at one end. The first chamfered portion engages with the third chamfered portion, and the second chamfered portion engages with the fourth chamfered portion.

3. The battery pack according to claim 2, characterized in that, The first insulating member is disposed near the bottom edge of the bonding surface of the corresponding individual cell, and the second insulating member is disposed near the side edge of the bonding surface of the corresponding individual cell.

4. The battery pack according to claim 2, characterized in that, The angle of the first chamfered portion is greater than 0 and less than 90 degrees; the angle of the second chamfered portion is greater than 0 and less than 90 degrees.

5. The battery pack according to claim 3, characterized in that, The length of the first insulating member is less than the bottom edge length of the corresponding single cell bonding surface, and the first chamfered portion avoids the R-angle of the corresponding single cell bonding surface, and the second chamfered portion avoids the R-angle of the corresponding single cell bonding surface.

6. The battery pack according to claim 3, characterized in that, The distance from the bottom edge of the first insulating component to the bonding surface of the corresponding individual cell is between 3 and 5 millimeters; The distance between the second isolator and the side of the corresponding cell bonding surface is between 3 and 5 millimeters.

7. The battery pack according to claim 1, characterized in that, The first insulating member is more flexible than the second insulating member.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The width of the first isolation member is between 5 and 10 mm; the width of the second isolation member is between 5 and 20 mm.

9. The battery pack according to any one of claims 1 to 7, characterized in that, It also includes a third isolation component, which includes at least one third isolation member, which is disposed between two adjacent individual cells based on a first direction; the third isolation member is disposed adjacent to the top edge of the bonding surface of the corresponding individual cell; The first end of the third isolator engages with one of the second isolators, and the second end of the third isolator engages with the other second isolator.

10. A battery system, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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