Battery pack

Abstract

The utility model provides a battery pack, which comprises a plurality of battery cell stacks arranged side by side, and a plurality of battery cells arranged on the battery cell stacks, wherein a gap is formed between every two adjacent battery cell stacks; the structural adhesive is filled in the gap; the isolation plate is located on the side faces, close to the upper cover, of the multiple battery cell stacking bodies and comprises electrical connection areas arranged opposite to the battery cell stacking bodies and gluing areas located between every two adjacent electrical connection areas, and each gluing area comprises a glue injection opening used for injecting structural glue into the corresponding gap; the first groove walls are arranged on the two sides of the glue injection opening respectively and protrude upwards, and the two first groove walls extend in the length direction of the gap so as to prevent the structural glue in the gluing area from entering the electrical connection area. According to the invention, the structural adhesive is limited in the gluing area, so that the problem that the structural adhesive pollutes the chip assembly in the electrical connection area is avoided, and the influence on the electrical performance of the battery pack is avoided.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] A battery pack separator is a structural component used in cell stacks. Its main function is to separate the cells and wiring harnesses within the stack, ensuring electrical and physical insulation between them. Additionally, gaps exist between adjacent cell stacks. These gaps are typically filled with adhesive to stably connect the two stacks. However, due to the narrow gaps, uneven adhesive application often occurs, affecting the connection stability between adjacent stacks. Furthermore, the adhesive application process may contaminate the battery pack's electrode assembly, thus impacting the battery pack's electrical performance. Utility Model Content

[0003] In view of the above, this application aims to provide a battery pack to solve some or all of the aforementioned technical problems.

[0004] For the purposes described above, this application provides a battery pack, comprising:

[0005] The upper cover and the bottom plate form an accommodating space;

[0006] Multiple battery cell stacks arranged side by side are located within the accommodating space, with gaps between adjacent battery cell stacks.

[0007] Structural adhesive, filling the gaps; and

[0008] An isolation plate, located on the side of the plurality of cell stacks near the top cover, includes an electrical connection area disposed opposite to each of the cell stacks, and an adhesive application area located between two adjacent electrical connection areas. The adhesive application area includes an injection port for injecting structural adhesive into the gap, and two upwardly protruding first groove walls respectively disposed on both sides of the injection port. The two first groove walls extend in the length direction of the gap to prevent structural adhesive in the adhesive application area from entering the electrical connection area.

[0009] Furthermore, the adhesive application area also includes second groove walls disposed at both ends in the length direction of the gap, the second groove walls being used to connect and seal the ends of the two first groove walls.

[0010] Furthermore, the adhesive application area also includes a plurality of baffles arranged parallel to each other between the two first groove walls, with the adhesive injection port formed between two adjacent baffles.

[0011] Furthermore, it also includes a high-temperature resistant insulating sheet located between the isolation plate and the upper cover, wherein the first groove wall is configured to support the high-temperature resistant insulating sheet to fit against the upper cover.

[0012] Furthermore, the first groove wall includes a first connecting portion, a first supporting portion, and a second connecting portion that are bent in sequence. The first connecting portion is used to connect the baffle, the second connecting portion is used to connect the electrical connection area, and the first supporting portion is used to support the high-temperature resistant insulating sheet to fit against the top cover.

[0013] Furthermore, the electrical connection area includes two strip connection areas and a wiring area located between the two strip connection areas. A first partition is provided between the strip connection areas and the wiring area. The first partition is parallel to the first groove wall and is configured to support the high-temperature resistant insulating sheet to fit against the top cover.

[0014] Furthermore, it also includes a battery cell assembly, the battery cell stack comprising a plurality of battery cells arranged side by side; the battery cell connection area is provided with a terminal connection hole, the battery cell assembly is connected to the terminal of the battery cell through the terminal connection hole, and the isolation plate includes a second partition for separating two adjacent battery cell assemblies, the second partition connecting the first groove wall and the first partition.

[0015] Furthermore, the side of the first groove wall and the side of the first partition near the top cover are higher than the side of the second partition near the top cover.

[0016] Furthermore, the sides of the first groove wall, the first partition, and the second partition near the top cover are all located on the same plane.

[0017] Furthermore, the width of the side of the first groove wall near the top cover is smaller than the width of the side of the first partition near the top cover.

[0018] As can be seen from the above, the battery pack provided in this application connects multiple separators in the battery pack of related technologies into a single separator. This single separator includes an electrical connection area disposed opposite to each cell stack. The area between two adjacent electrical connection areas is opposite to the gap between two adjacent cell stacks. An adhesive coating area is disposed between the two adjacent electrical connection areas. The adhesive coating area and the gap are connected through an injection port, through which structural adhesive is injected into the gap. Because the adhesive coating area also has two first groove walls extending in the length direction of the gap, and the first groove walls protrude upward relative to the injection port, the structural adhesive is confined within the adhesive coating area, thus avoiding the problem of structural adhesive contaminating the battery pack components in the electrical connection area, and consequently avoiding any impact on the electrical performance of the battery pack. In addition, the current-limiting space formed by the two first groove walls restricts the current of the structural adhesive, allowing the structural adhesive to slowly settle into the gap within the current-limiting space, thereby improving the uniformity of adhesive injection within the gap and thus improving the connection stability of two adjacent cell stacks. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the exploded structure of the battery pack in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the assembly structure of the battery pack excluding the top cover in an embodiment of this application;

[0022] Figure 3 for Figure 1 Enlarged view of region B in the middle;

[0023] Figure 4 for Figure 2 Enlarged view of region C in the middle;

[0024] Figure 5 This is a top-view structural diagram of the battery pack in an embodiment of this application;

[0025] Figure 6 for Figure 5 Schematic diagram of the cross section in the AA direction;

[0026] Figure 7 for Figure 6 Enlarged schematic diagram of region D in the middle;

[0027] Figure 8 for Figure 7 A schematic diagram showing the positional relationship between the isolation plate and the high-temperature resistant insulating sheet in the diagram;

[0028] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of a portion of the isolation plate;

[0030] Figure 11 for Figure 10 A magnified view of one end;

[0031] Figure 12 for Figure 10 A magnified view of the other end.

[0032] Explanation of reference numerals in the attached drawings: 100, top cover; 200, cell stack; 210, gap; 220, cell; 221, electrode tab; 300, separator plate; 310, adhesive application area; 311, first tank wall; 311a, first connecting part; 311b, first support part; 311c, second connecting part; 312, second tank wall; 313, baffle; 314, glue inlet; 315, structural adhesive; 320, electrical... Connection area; 321, Bar plate connection area; 321a, Terminal connection hole; 322, Wiring area; 323, First partition; 323a, Third connection part; 323aa, First part; 323ab, Second part; 323ac, Third part; 323b, Second support part; 323c, Fourth connection part; 324, Second partition; 400, High temperature resistant insulating sheet; 500, Bar plate assembly; 600, Base plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] As described in the background section, the separator 300 of the battery pack is a structural component used in the cell stack 200. Its main function is to isolate the cells 220 and wiring harnesses in the cell stack 200 to ensure electrical insulation and physical isolation between the cells 220 and the wiring harnesses. That is, in the case of battery packs with multiple cell stacks 200, multiple separators 300 are also provided, with each cell stack 200 corresponding to one separator 300. Each separator 300 mainly isolates the cells 220 and wiring harnesses in the corresponding cell stack 200.

[0036] In addition, there is a gap 210 between two adjacent cell stacks 200. Generally, the two adjacent cell stacks 200 are stably connected by filling the gap 210 with structural adhesive (such as foam). However, during the filling process, due to the narrow gap 210, the uniformity of adhesive filling often occurs, which affects the connection stability of the two adjacent cell stacks 200. Furthermore, the adhesive filling process may contaminate the battery pack assembly 500 on the separator 300, thereby affecting the electrical performance of the battery pack.

[0037] Based on the above problems, the applicant discovered that the above problems can be solved by connecting multiple separators 300 in the battery pack of the related technology into a whole separator 300, and setting an adhesive coating area 310 on the separator 300.

[0038] The following describes specific embodiments in conjunction with... Figures 1-12 The technical solution of this application will be described in detail below.

[0039] In view of this, such as Figures 1-4 , Figures 10-12As shown, in some embodiments, a battery pack includes: a top cover 100 and a bottom plate 600, with a receiving space formed between the top cover 100 and the bottom plate 600; a plurality of side-by-side battery cell stacks 200 located within the receiving space, with a gap 210 between adjacent battery cell stacks 200; and structural adhesive 315 filling the gaps 210. ； The isolation plate 300 is located on the side of the multiple cell stacks 200 near the top cover 100. It includes an electrical connection area 320 opposite to each cell stack 200, and an adhesive application area 310 located between two adjacent electrical connection areas 320. The adhesive application area 310 has an injection port 314 for injecting structural adhesive 315 into the gap 210, and two upwardly protruding first groove walls 311 respectively disposed on both sides of the injection port 314. The two first groove walls 311 extend along the length of the gap 210 (e.g., ...). Figure 4 Extending in the X direction (in the middle) to prevent structural adhesive 315 within the adhesive application area 310 from entering the electrical connection area.

[0040] like Figures 1-4 As shown in the figure, the battery pack includes six cell stacks 200. An integral isolation plate 300 is provided on the side of the six cell stacks 200 near the top cover 100. The isolation plate 300 provides six electrical connection areas 320 corresponding to the six cell stacks 200. An adhesive application area 310 is provided between two adjacent electrical connection areas 320 so that structural adhesive 315 can be injected into the gap 210 through the injection port 314 in the adhesive application area 310. In order to prevent the structural adhesive 315 from entering the adjacent electrical connection areas 320, a first groove wall 311 is provided on each side of the injection port 314.

[0041] like Figures 10-12 As shown, two opposing first groove walls 311 extend along the length of the gap 210, which can separate the adhesive application area 310 from the two adjacent electrical connection areas 320, thus forming a flow-limiting space for limiting the flow of structural adhesive. When injecting adhesive, the structural adhesive can be injected into the flow-limiting space first, and then enter the injection port 314 through the flow-limiting space.

[0042] like Figures 10-12 As shown, the adhesive application area 310 also includes a plurality of baffles 313 arranged parallel to each other between the two first groove walls, with an adhesive injection port 314 formed between two adjacent baffles 313. The arrangement of these baffles 313 not only achieves the necessary connection between the two first groove walls 311, but also forms a plurality of adhesive injection ports 314 within the adhesive application area 310 to a large extent. The structure is simple and reliable, and it is also conducive to the adhesive entering the gap 210.

[0043] In this embodiment, multiple separators 300 in a battery pack are connected into a single separator 300. This single separator 300 includes an electrical connection area 320 opposite to each cell stack 200. The area between two adjacent electrical connection areas 320 is opposite to a gap 210. A coating area 310 opposite to the gap 210 is provided between the two adjacent electrical connection areas 320. The coating area 310 communicates with the gap 210 through a glue injection port 314. When structural adhesive 315 is injected into the gap 210, it can be injected through the glue injection port 314. Because the coating area 310 also has two first groove walls 311 extending in the length direction of the gap 210, and the first groove walls 311 protrude upward relative to the glue injection port 314, the structural adhesive 315 is confined within the coating area 310. This avoids the problem of structural adhesive 315 contaminating the battery pack assembly 500 in the electrical connection area 320, thereby avoiding any impact on the electrical performance of the battery pack. In addition, the flow-limiting space formed by the two first groove walls 311 restricts the flow of the structural adhesive 315, allowing the structural adhesive 315 to slowly sink into the gap 210 within the flow-limiting space, thereby improving the uniformity of adhesive injection within the gap 210 and subsequently improving the connection stability of the two adjacent cell stacks 200.

[0044] The aforementioned embodiment has separated the adhesive application area 310 from the two adjacent electrical connection areas 320 by two first groove walls 311, thereby restricting the flow of structural adhesive to the adjacent electrical connection areas 320 to avoid contaminating the electrical connection areas 320. However, the two ends of the current-limiting space formed by the two first groove walls 311 are not sealed, and structural adhesive 315 can flow out from both ends of the current-limiting space and contaminate the side wall of the battery cell 220 located below. This problem needs to be further solved.

[0045] Based on the above problems, in some embodiments, such as Figure 11 , Figure 12 As shown, the adhesive application area 310 also includes second groove walls 312 disposed at both ends of the gap 210 along its length. The second groove walls 312 are used to connect and seal the ends of the two first groove walls 311.

[0046] In this embodiment, two first groove walls 311 respectively block a second groove wall 312 at both ends of the gap 210 along its length. The second groove wall 312, together with the first groove wall 311, forms a closed flow-limiting space, preventing the structural adhesive from flowing out from any side of the space, thus further enhancing the flow-limiting effect on the structural adhesive. Furthermore, the first groove wall 311 is relatively long, and its ends are prone to deformation during long-term use, affecting the overall strength of the isolation plate 300. The second groove wall 312 also restricts the position of the ends of the first groove wall 311, reducing the possibility of deformation during long-term use, thereby further enhancing the strength of the entire isolation plate 300.

[0047] In addition, the battery pack in the related technology will also be equipped with a high-temperature resistant insulating sheet 400 (such as a mica sheet). Each electrical connection area 320 of the separator 300 corresponds to a cell stack 200, and each includes two tab connection areas 321 and a wiring area 322 located between the two tab connection areas 321. Each tab connection area 321 is connected to the tab 221 of the cell 220 through a tab assembly 500. The risk of thermal runaway is relatively high. Therefore, each tab connection area 321 corresponds to a high-temperature resistant insulating sheet 400, such as... Figure 1 As shown, the battery pack includes six cell stacks 200, each corresponding to an electrical connection area 320 on the separator 300. This means the battery pack contains twelve high-temperature resistant insulating sheets 400. These high-temperature resistant insulating sheets 400 are typically connected to the top cover 100 by bonding or riveting. However, during long-term use, due to vibration and their own weight, the fit between the high-temperature insulating sheet and the top cover 100 may decrease. For example, at the edges of the high-temperature resistant insulating sheet 400, the bonding or riveting may have weak fixing force, leading to edge warping. This affects the structural strength and can cause breakage, consequently impacting the protection against thermal runaway of the cells 220 within the cell stack 200. Improvements are needed.

[0048] To address the above issues, in some embodiments, such as Figures 5-8 As shown, the battery pack also includes a high-temperature resistant insulating sheet 400 located between the separator 300 and the top cover 100, and the first groove wall 311 is configured to support the high-temperature resistant insulating sheet 400 to fit against the top cover 100.

[0049] As mentioned in the foregoing embodiments, the adhesive application area 310 is provided with two first groove walls 311 along the length of the gap 210, such as... Figure 7 , Figure 8 As shown, the two first groove walls 311 are respectively arranged opposite to the edge of a high-temperature resistant insulating sheet 400. By raising the first groove wall 311, the high-temperature resistant insulating sheet 400 can be lifted up to fit against the upper cover 100. That is, the edge of the high-temperature resistant insulating sheet 400 is held by the upper cover 100 and the first groove wall 311 together, which improves the fit between the high-temperature resistant insulating sheet 400 and the upper cover 100 in its edge area. This avoids problems such as edge lifting and breakage caused by weak fixing force of adhesive or riveting in the edge area, thereby ensuring the thermal runaway protection of the battery cell stack 200 by the high-temperature resistant insulating sheet 400.

[0050] In some embodiments, such as Figure 8 , Figure 11As shown, the first groove wall 311 includes a first connecting part 311a, a first supporting part 311b, and a second connecting part 311c that are bent in sequence. The first connecting part 311a is used to connect the baffle 313, the second connecting part 311c is used to connect the electrical connection area 320, and the first supporting part 311b is used to support the high-temperature resistant insulating sheet 400 to fit against the upper cover 100.

[0051] This embodiment describes a specific structure of a first groove wall 311. The first connecting portion 311a and the second connecting portion 311c of the first groove wall 311 are used to connect the baffle 313 and the electrical connection area 320 in the adhesive application area 310, respectively. The first groove wall 311 can limit the flow of structural adhesive in its length direction and can support the high-temperature resistant insulating sheet 400 in its height direction. In order to make the support more stable, the first connecting portion 311a, the first support portion 311b, and the second connecting portion 311c are bent in sequence, so that the first connecting portion 311a and the second connecting portion 311c are two support legs, and the first support portion 311b forms a support surface that abuts against the high-temperature resistant insulating sheet 400. This U-shaped support structure is more stable, so that the first groove wall 311 provides stable support for the high-temperature resistant insulating sheet 400.

[0052] In the aforementioned embodiment, the first groove wall 311 provides support for the edge of the high-temperature resistant insulating sheet 400 near the adhesive coating area 310, thus solving the problems of weak fixing force of the high-temperature resistant insulating sheet 400 in this edge area, resulting in edge warping and breakage. However, the same problem may occur at the other end of the high-temperature resistant insulating sheet 400, which requires further solutions.

[0053] Based on the above problems, in some embodiments, such as Figures 8-11 As shown, the electrical connection area 320 includes two strip connection areas 321 and a wiring area 322 located between the two strip connection areas 321. A first partition 323 is provided between the strip connection area 321 and the wiring area 322. The first partition 323 is parallel to the first groove wall 311. The first partition 323 is configured to support the high-temperature resistant insulating sheet 400 until it is in contact with the upper cover 100.

[0054] like Figure 8 As shown, the edge of the high-temperature resistant insulating sheet 400 on the side away from the adhesive coating area 310 is closer to the first partition 323. The first partition 323 can be raised to support the high-temperature resistant insulating sheet 400 to fit against the upper cover 100. That is, the edge of the high-temperature resistant insulating sheet 400 is held by the upper cover 100 and the groove wall of the adhesive coating area 310, which improves the fit between the high-temperature resistant insulating sheet 400 and the upper cover 100 in its edge area. This avoids problems such as edge lifting and breakage caused by weak fixing force of adhesive or riveting in the edge area, thereby ensuring the thermal runaway protection of the cell stack 200 by the high-temperature resistant insulating sheet 400.

[0055] like Figure 9 As shown, similar to the first groove wall 311, the first partition 323 also includes a third connecting portion 323a, a second supporting portion 323b, and a fourth connecting portion 323c that are bent sequentially. The third connecting portion 323a is used to connect the strip connecting area 321, the fourth connecting portion 323c is used to connect the wiring area 322, and the second supporting portion 323b is used to support the high-temperature resistant insulating sheet 400. However, unlike the first groove wall 311, since the strip connecting area 321 and the wiring area 322 are arranged adjacent to each other, if a first partition 323 is only set between the connecting area and the wiring area 322, the first partition 323 will be narrower than the first groove wall 311. Therefore, the second supporting portion 323b of the first partition 323 will also be very narrow and cannot provide stable support for the high-temperature resistant insulating sheet 400. Therefore, the third connecting portion 323a of the first partition 323 is bent towards the first groove wall 311. The third connecting part 323a is bent in the direction near the first groove wall 311. That is, the third connecting part 323a includes a first part 323aa, a second part 323ab, and a third part 323ac that are bent in sequence. The first part 323aa is connected to the strip connecting area 321, and the third part 323ac is connected to the second support part 323b. The second part 323ab is bent in the direction near the first groove wall 311 relative to the first part 323aa. The length of the second part 323ab is mainly to ensure that the second support part 323b of the first partition 323 has sufficient width to provide stable support for the high-temperature resistant insulating component. Of course, the length of the second part 323ab also depends on the installation position of the strip assembly 500 in the strip connecting area 321. That is, the second part 323ab and the third part 323ac cannot interfere with the strip assembly 500 located in the strip connecting area 321.

[0056] Furthermore, the width of the side of the first partition 323 near the top cover 100 is greater than the width of the side of the first groove wall 311 near the top cover 100, meaning the width of the second support portion 323b is greater than the width of the first support portion 311b. Because the adhesive application area 310 needs a sufficiently large flow-limiting space to facilitate adhesive injection into the injection port 314, the first groove wall 311 needs to be relatively narrow. Consequently, the contact area between its first support portion 311b and the high-temperature insulating sheet 400 is also relatively small. Moreover, the first support portion 311b directly abuts against the edge of the high-temperature insulating sheet 400 near the adhesive application area 310. Even with its narrowness, this overcomes problems such as edge warping and breakage caused by weak fixing force of the high-temperature insulating sheet 400 to this edge area due to bonding or riveting. However, because the third connecting portion 323a of the first partition 323 is bent towards the first groove wall 311, its second support portion 323b is less restricted by space. Figure 8It can be seen that the second support part 323b only abuts against the area near the other edge of the high-temperature resistant insulating sheet 400, and there is still a distance from the other edge. Therefore, the width of the second support part 323b needs to be set larger to overcome the problems of warping and breakage caused by the weak fixing force of the high-temperature resistant insulating sheet 400 to the other edge area due to bonding or riveting.

[0057] In some embodiments, such as Figure 1 , Figure 7 , Figure 11 As shown, the battery pack also includes a strip assembly 500, and the cell stack 200 includes a plurality of cells 220 arranged side by side; the strip connection area 321 is provided with a terminal connection hole 321a, and the strip assembly 500 is connected to the terminal of the cell 220 through the terminal connection hole 321a; the separator 300 includes a second partition 324 for separating two adjacent strip assemblies 500, and the second partition 324 connects the first groove wall 311 and the first partition 323.

[0058] Because the second partition 324 directly connects the first groove wall 311 and the first partition 323, the adhesive application area 321 and the glue application area 310 share the first groove wall 311, and the adhesive application area 321 and the wiring area 322 share the first partition 323, resulting in a simple and reliable structure. The height of the second partition 324 includes the following two cases:

[0059] In the first scenario, the sides of the first groove wall 311 and the first partition 323 near the top cover 100 are higher than the side of the second partition 324 near the top cover 100. That is, the first support portion 311b of the first groove wall 311 and the second support portion 323b of the first partition 323 are located on the same plane and are both higher than the side of the second partition 324 near the top cover 100. For high-temperature resistant insulating sheets 400 where only the edge areas are prone to warping or breakage, the problem can be solved by the first support portion 311b supporting one edge and the second support portion 323b supporting the area near the other edge. The top surface of the second partition 324 corresponds to the central area of ​​the high-temperature resistant insulating sheet 400. If the central area is not prone to warping or breakage, there is no need to raise the second partition 324.

[0060] In the second scenario, the sides of the first groove wall 311, the first partition 323, and the second partition 324 near the upper cover 100 are all located on the same plane, and are used to support the high-temperature resistant insulating sheet 400 to fit against the upper cover 100. Specifically, the first support portion 311b of the first groove wall 311, the second support portion 323b of the first partition 323, and the top of the second partition 324 are all located on the same plane to support the high-temperature resistant insulating sheet 400 to fit against the upper cover 100. The first support portion 311b supports one edge of the high-temperature resistant insulating sheet 400, the second support portion 323b supports the area near the other edge of the high-temperature resistant insulating sheet 400, and the top surface of the second partition 324 supports the central area of ​​the high-temperature resistant insulating sheet 400. This overcomes problems such as edge warping and breakage caused by weak bonding or riveting fixing force in the edge and central areas of the high-temperature resistant insulating sheet 400.

[0061] In this embodiment, the height of the second partition 324 between two adjacent battery pack assemblies 500 is described in two ways. First, the top surface of the second partition 324 is lower than the top surfaces of the first groove wall 311 and the first partition 323. This means only the first groove wall 311 and the first partition 323 need to support the high-temperature resistant insulating sheet 400, suitable for high-temperature resistant insulating sheets 400 where edge warping and breakage are common only in the edge areas. Second, the top surface of the second partition 324 is on the same plane as the top surfaces of the first groove wall 311 and the first partition 323. This means the first groove wall 311, the first partition 323, and the second partition 324 all need to support the high-temperature resistant insulating sheet 400, suitable for high-temperature resistant insulating sheets 400 where edge warping and breakage are common in both the edge and central areas. This allows for flexible selection of partition plates 300 with different heights of the second partition 324 depending on the condition of the high-temperature resistant insulating sheet 400, providing more options for battery pack assembly.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this application as described above, which are not provided in the details for the sake of brevity.

[0063] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: A top cover and a bottom plate, with an accommodating space formed between the top cover and the bottom plate; Multiple battery cell stacks arranged side by side are located within the accommodating space, with gaps between adjacent battery cell stacks. Structural adhesive is used to fill the gaps. as well as An isolation plate, located on the side of the plurality of cell stacks near the top cover, includes an electrical connection area disposed opposite to each of the cell stacks, and an adhesive application area located between two adjacent electrical connection areas. The adhesive application area includes an injection port for injecting structural adhesive into the gap, and two upwardly protruding first groove walls respectively disposed on both sides of the injection port. The two first groove walls extend in the length direction of the gap to prevent structural adhesive in the adhesive application area from entering the electrical connection area.

2. The battery pack according to claim 1, characterized in that, The adhesive application area also includes second groove walls disposed at both ends in the length direction of the gap, the second groove walls being used to connect and seal the ends of the two first groove walls.

3. The battery pack according to claim 1, characterized in that, The adhesive application area also includes a plurality of baffles arranged in parallel between the two first groove walls, with the adhesive injection port formed between two adjacent baffles.

4. The battery pack according to claim 3, characterized in that, It also includes a high-temperature resistant insulating sheet located between the isolation plate and the upper cover, wherein the first groove wall is configured to support the high-temperature resistant insulating sheet to fit against the upper cover.

5. The battery pack according to claim 4, characterized in that, The first groove wall includes a first connecting part, a first supporting part and a second connecting part that are bent in sequence. The first connecting part is used to connect the baffle, the second connecting part is used to connect the electrical connection area, and the first supporting part is used to support the high-temperature resistant insulating sheet to fit against the top cover.

6. The battery pack according to claim 4, characterized in that, The electrical connection area includes two strip connection areas and a wiring area located between the two strip connection areas. A first partition is provided between the strip connection areas and the wiring area. The first partition is parallel to the first groove wall and is configured to support the high-temperature resistant insulating sheet to fit against the top cover.

7. The battery pack according to claim 6, characterized in that, It also includes a battery cell assembly, the battery cell stack comprising a plurality of battery cells arranged side by side; the battery cell connection area is provided with a terminal connection hole, the battery cell assembly is connected to the terminal of the battery cell through the terminal connection hole, and the isolation plate includes a second partition for separating two adjacent battery cell assemblies, the second partition connecting the first groove wall and the first partition.

8. The battery pack according to claim 7, characterized in that, The side of the first groove wall and the side of the first partition near the top cover are higher than the side of the second partition near the top cover.

9. The battery pack according to claim 7, characterized in that, The first groove wall, the first partition, and the second partition are all located on the same plane near the top cover.

10. The battery pack according to claim 6, characterized in that, The width of the side of the first groove wall near the top cover is smaller than the width of the side of the first partition near the top cover.

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