Battery pack

Abstract

The present application provides a battery pack. The battery pack comprises a battery cell module and a protective casing; the protective casing comprises a sleeve that is sleeved outside the battery cell module; the sleeve at least wraps around the battery cell module in the arrangement direction of side walls of the battery cell module, and the sleeve and the battery cell module are an integrated structure formed by injection molding. The sleeve that wraps the battery cell module and is injection-molded together with the battery cell module is arranged in the battery pack, providing effective and stable protection to the battery cell module, preventing external forces from impacting the battery cell module, achieving the effects of shock resistance, buffering, expansion absorption and the like, improving the safety performance of the battery pack, prolonging the effective service life of the battery pack, solving the problem that the battery pack is easily damaged due to collision caused by vibration and the like, and improving the durability of the battery pack and the adaptability to application scenarios. Moreover, due to injection molding, the production is simple and convenient, the size and shape of the protective casing are easier to control, and the protection area of the sleeve for the battery cell module can be accurately controlled.

Description

battery pack Technical Field

[0001] The present application relates to the technical field of battery pack packaging, and in particular to a battery pack. Background Art

[0002] Battery packs are installed on equipment and are often subject to bumps and collisions during use due to vibration, drops, and impacts. Battery cells are typically soft-wrapped with aluminum foil, and some battery packs even have soft-wrapped casings. Without proper protection, the battery cells can be easily damaged.

[0003] Summary of the Invention

[0004] In view of this, the embodiments of the present application are dedicated to providing a battery pack having a protective layer on the outside of its battery cell module, and the protective layer is easy to form and manufacture, which can not only improve the safety performance of the battery pack, but also help improve the production efficiency of the battery pack.

[0005] The present application provides a battery pack, including a battery cell module and a protective cover;

[0006] The protective sleeve includes a sleeve sleeved outside the battery cell module, the sleeve surrounds and wraps the battery cell module at least along the arrangement direction of each side wall of the battery cell module, and the sleeve and the battery cell module are an injection-molded integral structure.

[0007] In a possible embodiment, the battery cell module includes a plurality of arranged battery cell units, and the protective sleeve also includes a plurality of partition bars located inside the sleeve. At least one partition bar is provided between any two adjacent battery cell units in the battery cell module, and the partition bar and the battery cell module are an injection-molded integral structure.

[0008] In a possible embodiment, in a first direction of the battery cell, at least two spaced-apart separators are provided between any two adjacent battery cell units; the first direction is the direction from the bottom of the battery cell to the tab.

[0009] In a possible embodiment, the protective sleeve further includes a support protection block in a plate structure and / or a tab protection block in a plate structure;

[0010] The support and protection block is located below the battery cell module and wraps the bottom sealing edge of each battery cell;

[0011] The tab protection block is sleeved on each tab of the battery cell module and has an avoidance hole for the top of each tab to pass through. The avoidance hole is arranged one-to-one with the tab, and the tab protection block wraps the top sealing edge of each battery cell.

[0012] In a possible implementation, the protective cover and the battery cell module are an integral injection-molded structure.

[0013] In a possible implementation manner, in a first direction of the battery cell, the tab protection block extends to the battery cell body of the battery cell; the first direction is the direction from the bottom of the battery cell to the tab.

[0014] In a possible implementation, the battery cell module includes a plurality of arranged battery cell units, and the support protection block includes a plurality of spaced protection strips, and the protection strips are arranged one-to-one with the battery cell units.

[0015] In a possible embodiment, the protective sleeve also includes a filling strip located inside the sleeve and filling the side seal of each battery cell, one end of the filling strip is connected to the tab protection block, and the other end is connected to the support protection block; in the first direction of the battery cell, the barrel of the sleeve is spaced apart from the tab protection block and the support protection block.

[0016] In a possible implementation manner, the sleeve of the protective sleeve has a through hole, and any one of the partition strips has the through holes on both sides of the battery core in the first direction.

[0017] In one possible embodiment, the thickness of the separator strip is S, the battery cell unit includes N battery cells, the thickness of the battery cell is D, and (N-1)S*70%=D*12%*N and / or the wall thickness of the sleeve is L, and 1.0 mm ≥ L ≥ 4.0 mm.

[0018] According to the battery pack provided by the present application, a protective sleeve is provided on the outer cover of the battery cell module, and the sleeve of the protective sleeve and the battery cell module are an injection-molded integral structure. That is, the battery cell module is placed in a mold, and when the sleeve is injection-molded, it is integrally formed with the sleeve, so that the sleeve is closely connected to the battery cell module and surrounds and wraps the battery cell module along the circumference of the side wall. In addition, the sleeve is an injection-molded part made of a material with elastic deformation such as foam, silicone, or plastic, which can effectively and stably protect the battery cell module, prevent external forces from impacting the battery cell module, and play a role in shock resistance, buffering, and absorbing expansion, thereby improving the safety performance of the battery pack, extending the effective service life of the battery pack, solving the problem that the battery pack is easily damaged by bumps and collisions caused by vibrations, etc., and improving the durability of the battery pack and its applicability to application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a perspective schematic diagram of a protective cover and a battery module according to an embodiment of the present application;

[0020] FIG2 is a front view of a protective cover and a battery module according to an embodiment of the present application;

[0021] FIG3 is a cross-sectional view of TT in FIG2 ;

[0022] FIG4 is a cross-sectional view of GG in FIG2 ;

[0023] FIG5 is a VV cross-sectional view in FIG2 ;

[0024] FIG6 is a side view of a protective cover and a battery module according to an embodiment of the present application;

[0025] FIG7 is a cross-sectional view taken along line NN in FIG6 .

[0026] In Figures 1 to 7:

[0027] 1. Sleeve; 101. Through hole; 11. Cylinder; 12. Separator; 2. Tab protection block; 3. Support protection block; 4. Filler strip; 5. Cell module; 51. Cell unit; 501. Cell. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] First, it should be noted that spatial terms, such as "bottom" and "top," are intended to refer to the two opposing ends of a battery cell. The "bottom" and "top" expressions are used here to accommodate the orientation of the accompanying drawings and facilitate description. When the orientation of the drawings changes, the spatial terms should be interpreted accordingly.

[0030] Please refer to Figures 1-7. An embodiment of the present application provides a battery pack, which includes a battery cell module 5 and a protective sleeve. The protective sleeve is used to protect the battery cell module 5. The protective sleeve at least includes a sleeve 1 that is sleeved outside the battery cell module 5. The barrel 11 of the sleeve 1 surrounds and wraps the battery cell module 5 at least along the lateral direction of the battery cell module 5 (the lateral direction refers to the arrangement direction of each side wall), and the sleeve 1 and the battery cell module 5 are an injection-molded integral structure. That is, the battery cell module 5 is placed in the mold, and when the sleeve 1 is injection molded, it is integrally formed with the sleeve 1, so that the sleeve 1 is tightly connected to the battery cell module 5, and the sleeve 1 is wrapped around the battery cell module 5, which can effectively and stably protect the battery cell module 5. In addition, the sleeve 1 is an injection molded part, and its material can be foam, silicone, plastic, etc., which has elastic deformation or elastic compression. It can absorb and reduce the impact of external force on the battery cell module 5, prevent external force from violently or vigorously impacting the battery cell module 5, and play the role of shock resistance, buffering, expansion absorption, and anti-collision, effectively protecting the battery cell module 5, improving the safety performance of the battery pack, extending the effective service life of the battery pack, and solving the problem that the battery pack is easily damaged by collisions caused by vibrations, etc., thereby improving the stability, durability and applicability of the battery pack to application scenarios.

[0031] The sleeve 1 and cell module 5 of the protective sleeve are an integrally injection-molded structure. This process is simple to manufacture, with concise steps and easier control of size and shape. This not only facilitates molding to the desired size and shape, but also allows for precise control of the area protected by the sleeve 1 on the cell module 5. Compared to manually applying protective material to multiple exterior surfaces of the cell module 5, this method eliminates the cumbersome steps and the potential for inaccurate application, and also facilitates standardized production.

[0032] The wall thickness of the sleeve 1 is denoted as L. The thickness of the sleeve 1 can be specifically set according to the overall thickness requirements of the battery pack and the battery cell. In some embodiments, 1.0 mm ≥ L ≥ 4.0 mm, to avoid the sleeve 1 being too thin and failing to provide good protection, and to avoid the sleeve 1 being too thick and occupying more space, thereby unnecessarily increasing the volume of the battery pack.

[0033] Of course, a battery pack housing can also be installed outside the protective sleeve for waterproofing. The battery pack housing is typically made of a hard material, such as metal. The protective sleeve is sandwiched between the housing and the battery module, encasing the module. This ensures the entire battery pack is shock-resistant, drop-resistant, and waterproof, offering excellent safety performance.

[0034] Typically, the battery module 5 includes a plurality of arranged battery cell units 51, and each battery cell unit 51 includes at least one battery cell 501, for example, two or more. The battery cell 501 will swell under long-term use, affecting the stability of the battery cell 501. To solve this problem, in some embodiments of the present application, the protective sleeve also includes a plurality of dividing strips 12 located inside the sleeve 1, that is, the dividing strips 12 are located in the barrel cavity of the sleeve 1, and at least one dividing strip 12 is provided between any two adjacent battery cell units 51 in the battery module 5, and the dividing strips 12 and the battery module 5 are an injection-molded integral structure, that is, the barrel of the sleeve 1 and the dividing strips 12 are all injection-molded integral structures with the battery module 5. The barrel 11 and the dividing strips 12 can be connected to form an integral structure, which is an integrally injection-molded injection molded part, and the entire sleeve 1 and the battery module 5 are an injection-molded integral structure.

[0035] For example, during injection molding, the battery cell units 51 are spaced apart in the injection molding cavity. After injection molding, the barrel 11 will be wrapped around the battery cell module 5, and a separator 12 will exist between any two adjacent battery cell units 51. Both the separator 12 and the barrel 11 have elastic compression capacity. The separator 12 can absorb the expansion of each battery cell unit 51, and the sleeve 1 can absorb the expansion of the entire battery cell module 5 to maintain the overall volume and external dimensions of the battery pack unchanged, and also ensure that the protective sleeve is always firmly attached to the battery cell module 5, firmly protecting the battery cell module 5. The separator 12 and the barrel 11 are integrally formed, that is, the entire sleeve 1 and the battery cell module 5 are integrally molded by injection molding, which not only enhances the connection stability of the separator 12 and the barrel 11 and the overall strength of the sleeve 1, thereby enhancing the protective effect of the battery cell module 5, but also eliminates the need for manual material filling or assembly between the battery cell units 51, effectively simplifying the battery pack manufacturing process, thereby improving the production efficiency of the battery pack.

[0036] When the battery cells 501 expand, the separator bars 12 are compressed, and the compressed space can absorb the expanded thickness of the battery cells 501. To ensure that the separator bars 12 can fully absorb the expansion and that the separator bars 12 are not too thick to avoid increasing the volume of the battery pack, in some embodiments, the thickness of the separator bars 12 is S, the battery cell unit 51 includes N battery cells 501, and the thickness of the battery cells 501 is D, (N-1)*S*70%=D*12%*N. Thus, the thickness of the separator bars 12 is set according to the battery cell thickness and the estimated battery cell expansion rate, so that the thickness of the separator bars 12 is appropriate. Separator bars 12 of appropriate thickness can fully absorb the expansion space of the battery cells 501 while avoiding excessive increase in the volume of the battery pack.

[0037] The separator 12 can be in the shape of a plate, with the thickness direction consistent with the thickness direction of the battery cell 501, the arrangement direction also consistent with the arrangement direction of the battery cell 501, and the height consistent with or substantially consistent with the height of the battery cell module 5, or the height of the separator 12 is less than the height of the battery cell module 5. In the height direction of the battery cell module 5, a plurality of separators 12 are arranged at intervals. As shown in FIG1 , the direction from the bottom to the tab of the battery cell 501 is recorded as the first direction (the Z direction shown in the accompanying drawings, the same below), that is, the height direction of the battery cell module 5. At least two separators 12 are arranged at intervals between any two adjacent battery cell units 51, as shown in FIG4 . In this way, there are at least two separators 12 arranged between any two adjacent battery cell units 51, which can support the two adjacent battery cell units 51 at equal distances, prevent the two adjacent battery cell units 51 from being skewed due to unequal spacing, and save materials.

[0038] The sleeve 1 can be a cylindrical structure with one or both ends open, and the cross-section can be circular, square or other shapes, or it can be closed (i.e., having a top plate and a bottom plate, which encloses the battery module 5), so that the top and bottom ends of the battery cell 501 can also be protected.

[0039] When assembling the soft-pack battery cells 501, each cell 501 is wrapped in aluminum foil or other materials, and then the soft-pack material is heat-sealed. Consequently, the bottom, tab, and sides of the cell 501 are each sealed with soft-pack material, referred to as the bottom, top, and side seals, respectively. These seals are also susceptible to damage from friction caused by vibrations, posing a risk of cracking the soft-pack material and affecting the battery pack's usability. Furthermore, there is a risk of the tabs of the cell 501 contacting each other, bending, or breaking due to external vibrations.

[0040] In order to at least partially solve the above problems, in some embodiments of the present application, the sleeve 1 is an open structure, and the protective sleeve also includes a tab protection block 2, which is also in a plate structure, such as a plate shape. The tab protection block 2 is laid on the top position of the battery cell module 5, and is inserted into each tab of the battery cell module 5. It has a avoidance hole for the top of each tab to pass through. The avoidance hole is set one-to-one with the tab so that the top of each tab can pass through the tab protection block 2 and be energized with the outside world. And the tab protection block 2 wraps the top seal of each battery cell 501. In this way, the tab protection block 2 wraps the top seal, which can prevent the top seal from being damaged, enhance the shock resistance and adaptability of the battery cell 501 to the outside world, and improve the sealing and safety of the battery cell 501. The tab protection block 2 wraps and separates each tab, effectively protecting the tabs and enhancing the endurance of each tab. It also prevents the tabs of the battery cell 501 from contacting each other or bending or breaking the tabs due to external vibrations, thereby avoiding the risk of short circuits at the tabs due to vibrations and other reasons.

[0041] The top seal usually has a depression. Therefore, in some embodiments, in the first direction of the battery cell 501 (i.e., the height direction of the battery cell 501, which is also the direction from the bottom of the battery cell to the tab), the tab protection block 2 not only covers the top seal, but also extends to the battery body of the battery cell, that is, in the first direction of the battery cell 501, the top surface of the tab protection block 2 is not lower than the top seal of the battery cell 501, and the bottom surface is lower than the top surface of the battery cell 501 body of the battery cell 501. In this way, the tab protection block 2 fills the depression of the top seal, surrounds the corners, and covers the top surface of the battery cell 501 body, effectively fully wrapping the top seal, and effectively enhancing the stability and shock resistance of the weak areas on the top of the battery cell 501, including the tabs and the top seal.

[0042] The tab protection block 2 and the battery cell module 5 can be an injection-molded integral structure. This arrangement is convenient for production, and the tab protection block 2 and the battery cell module 5 have close connectivity, resulting in a better protection effect.

[0043] As shown in Figure 3, along the length direction of the edge seal, the bottom edge seal usually has sharp corners at both ends and is concave in the middle. In some embodiments, the protective sleeve includes a support protection block 3, and the support protection block 3 is in a plate structure, such as a plate shape, and the tab protection block 2 is also in a plate structure, such as a plate shape. The support protection block 3 is located below the battery cell module 5, wrapping the bottom edge seal of each battery cell 501, and at least filling the concave area of ​​the bottom edge seal of each battery cell 501. The support protection block 3 at least fills and wraps the concave area between the two sharp corners of the bottom edge seal. Of course, further, it can also wrap the sharp corners, that is, fully wrap the bottom edge seal of each battery cell 501.

[0044] As shown in Figures 3-5, in the first direction of the battery cell 501, the bottom end surface of the support and protection block 3 is lower than the bottom edge seal. In the second direction of the battery cell 501, i.e., the length of the bottom edge seal, the support and protection block 3 at least fills the recessed area between the two ends of the bottom edge seal. It can be slightly shorter than the bottom edge seal, or it can be the same length as the bottom edge seal, completely wrapping the bottom edge seal, or even exceed the bottom edge seal.

[0045] With such a configuration, the bottom end of the battery cell module 5 has a protective support that wraps the bottom sealing edge of the battery cell 501, which can not only protect the bottom sealing edge to prevent it from being damaged and broken, but also provide firm protection and support for the bottom of the battery cell module 5, thereby enhancing the stability and shock resistance of the battery cell module 5.

[0046] The support and protection block 3 can be a whole block, or the battery cell module 5 includes a plurality of arranged battery cell units 51 , and the support and protection block 3 includes a plurality of spaced protection strips, which are arranged one-to-one with the battery cell units 51 .

[0047] The support and protection block 3 and the battery module 5 can be an integral injection-molded structure. This configuration is convenient for manufacturing and the support and protection block 3 and the battery module 5 can be tightly connected, thereby achieving a better protection effect.

[0048] Of course, in some embodiments, the protective sleeve includes the tab protection block 2 , the support protection block 3 and the sleeve 1 , which can provide all-round protection for the battery cell module 5 .

[0049] The support and protection block 3 can be connected to the sleeve 1 or have a gap therebetween. Similarly, the tab protection block 2 can be connected to the sleeve 1 or have a gap therebetween.

[0050] In some embodiments, in the first direction of the battery cell 501, the barrel 11 of the sleeve 1 is spaced apart from the tab protection block 2 and the support protection block 3, as shown in FIG3 . This arrangement facilitates the mold to clamp or support the battery cell module 5 at the spaced apart locations, enhancing stability during the injection molding process and preventing the battery cell 501 from shaking, which could cause the size of the injected protective sleeve to deviate, thereby affecting the protective effect.

[0051] When the support protection block 3 and the tab protection block 2 are both spaced apart from the cylindrical body 11 of the sleeve 1 , the two can also be an injection-molded integral structure with the battery module 5 , that is, the entire protective sleeve and the battery module 5 are an injection-molded integral structure.

[0052] Since the entire protective sleeve and the battery module 5 are an injection-molded integrated structure, after the battery module 5 is placed in the injection mold, the injection molding material will fill all the gaps and corners. Since the side seals of the battery cell 501 are not flat, the protective sleeve also includes a filling strip 4 to fill the side seals of each battery cell 501. As shown in Figure 5, the filling strips 4 are located inside the sleeve 1 and are arranged at intervals along the arrangement direction of the battery cells 501 in the battery module 5. Each battery cell 501 has a filling strip 4 on both sides of the thickness direction. In the first direction of the battery cell 501, one end of the filling strip 4 is connected to the tab protection block 2 and the other end is connected to the support protection block 3. At the same time, the filling strip 4 is connected to the sleeve 1.

[0053] The above-mentioned protective cover and the battery cell module 5 are an injection-molded integrated structure, which can be injection-molded by an injection mold. For example, the injection mold includes a front mold and a rear mold that are interlocked, and the front mold and the rear mold are interlocked to enclose an injection cavity. The cross-sectional size of the injection cavity is larger than the cross-sectional size of the battery cell module 5, and the side wall of the injection cavity is spaced apart from the outer side wall of the battery cell module 5, and the space forms an injection space for the sleeve 1. At the same time, a plurality of partitions arranged at intervals along the arrangement direction of the battery cell units 51 are provided in the injection cavity, and the space between each two adjacent partitions is used to accommodate the battery cell units 51. Each battery cell unit 51 is placed in the injection cavity and placed one by one in the space between the partitions, so that there is a partition between each two adjacent battery cell units 51. Moreover, the partition has an injection molding opening. In other words, the partition includes at least two plates arranged at intervals along the first direction, and the intervals between the plates form an injection molding opening. The injection molding opening is connected to the injection molding space of the sleeve 1, that is, it is connected to the interval between the side wall of the injection molding cavity and the side wall of the battery cell module 5, so that the injection molding material can enter. The injection molding opening forms the injection molding space of the partition strip 12.

[0054] For example, the ends of each partition are connected to the sidewall of the injection molding cavity, while the ends of the injection molding opening are connected to the gap between the injection molding cavity and the sidewall of the battery cell module 5. This is equivalent to dividing the partition into several plates arranged along the height direction. For example, there are at least two injection molding openings arranged along the height direction of the partition, which is also the first direction of the battery cell 501. The partition is divided into at least three plates along the height direction. In other words, in the first direction, the three plates are arranged at intervals, forming the injection molding space of the partition bar 12.

[0055] In this way, when the battery cell module 5 is placed in the injection mold and the injection mold is closed, the injection material of the protective cover is injected, and after molding, the protective cover with the partition strips 12 described in the above embodiment can be formed, and the above-mentioned filling strips 4 will be formed.

[0056] Due to the presence of the partition, which is connected to the sidewall of the injection molding cavity, the sleeve 1 formed by injection molding has through holes 101. In the first direction, both sides of any battery cell 501 have through holes 101. These through holes 101 can enhance the heat dissipation of the battery cell module 5 and also provide deformation space for the sleeve 1, which helps the protective sleeve more effectively protect the battery cell module 5.

[0057] The front mold and the rear mold can be arranged vertically or horizontally. In the horizontal arrangement, the left plate body with a partition is provided on the side wall of the front mold, and the right plate body with a partition is provided on the side wall of the rear mold. The two plates are fastened together, and the left plate body and the right plate body are connected to form the injection molding space surrounding the battery cell module 5 and the injection molding space of the partition strip 12 located between the battery cell units 51.

[0058] The bottom wall of the injection cavity protrudes with a first boss for supporting the bottom of the battery cell 501. The first boss is located in the central area of ​​the bottom of the battery cell module 5, or there are at least two first bosses and they are spaced apart, such as distributed at both ends of the second direction of the battery cell 501 (the X direction shown in the accompanying drawings, the same below), that is, the length direction of the edge sealing. The recessed space around the first boss forms an injection space for supporting the protective block 3.

[0059] The sidewalls of the injection molding cavity are provided with second bosses. These bosses surround the cell module 5 and abut against the outer sidewalls of the cell module 5, clamping and securing the cell module 5 and preventing it from tilting due to the flow of the injection molding material. Two sets of second bosses can be provided, distributed along the height of the injection molding cavity and in the first direction of the cell module 5, with one set located at the top and the other at the bottom, to firmly clamp the cell module 5.

[0060] The two groups of second bosses also divide the entire injection cavity into three parts. The upper part is the injection space of the tab protection block 2, the middle part is the injection space of the sleeve 1, and the lower part is the injection space of the support protection block 3. The protective sleeve formed by injection molding, the barrel 11 of the sleeve 1 will be spaced from the tab protection block 2 and the support protection block 3 in the first direction, but the filling strip 4 is located inside the sleeve 1, so the filling strip 4 will extend from the tab protection block 2 to the support protection block 3, connecting the three.

[0061] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0062] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0063] It should also be noted that in the devices and equipment of the present application, the components can be decomposed and / or reassembled, and such decompositions and / or reassemblies should be regarded as equivalent solutions of the present application.

[0064] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0065] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: Including battery module and protective cover; The protective sleeve comprises a sleeve sleeved outside the battery cell module, the sleeve surrounds and wraps the battery cell module at least along the arrangement direction of each side wall of the battery cell module, and the sleeve and the battery cell module are an injection-molded integral structure.

2. The battery pack according to claim 1, characterized in that: The battery cell module includes a plurality of arranged battery cell units, the protective sleeve also includes a plurality of partition bars located inside the sleeve, at least one partition bar is arranged between any two adjacent battery cell units in the battery cell module, and the partition bar and the battery cell module are an integral injection-molded structure.

3. The battery pack according to claim 2, characterized in that: In the first direction of the battery cell, at least two of the separator bars are arranged at intervals between any two adjacent battery cell units; the first direction is the direction from the bottom of the battery cell to the pole ear.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The protective sleeve also includes a support protection block in a plate structure, and the support protection block is located below the battery cell module and wraps the bottom sealing edge of each battery cell.

5. The battery pack according to claim 4, characterized in that: The battery cell module includes a plurality of battery cell units arranged in an array, and the support protection block includes a plurality of protection strips arranged at intervals, and the protection strips are arranged one to one with the battery cell units.

6. The battery pack according to claim 4 or 5, characterized in that: The protective cover also includes a tab protection block in a plate structure; the tab protection block is sleeved on each tab of the battery cell module and has an avoidance hole for the top of each tab to pass through, the avoidance hole is arranged one-to-one with the tab, and the tab protection block wraps the top sealing edge of each battery cell.

7. The battery pack according to claim 6, characterized in that: In a first direction of the battery cell, the tab protection block extends to the battery cell body of the battery cell; the first direction is the direction from the bottom of the battery cell to the tab.

8. The battery pack according to claim 6 or 7, characterized in that: The protective sleeve also includes a filling strip located inside the sleeve and filling the side sealing edge of each battery cell, one end of the filling strip is connected to the tab protection block, and the other end is connected to the support protection block; In the first direction of the battery core, the barrel of the sleeve is spaced apart from the tab protection block and the support protection block respectively.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The sleeve of the protective sleeve has a through hole, and in a first direction, both sides of any one of the battery cells have the through holes, and the first direction is the direction from the bottom of the battery cell to the pole ear.

10. The battery pack according to claim 2 or 3, characterized in that: The thickness of the separator strip is S, the battery cell unit includes N battery cells, the thickness of the battery cells is D, and (N-1)S*70%=D*12%*N.

11. The battery pack according to any one of claims 1 to 10, characterized in that ,, the wall thickness of the sleeve is L, and 1.0 mm ≥ L ≥ 4.0 mm.

12. The battery pack according to any one of claims 1 to 11, characterized in that: The protective cover and the battery core module are an integral injection-molded structure.

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