Battery pack and vehicle

By setting grooves and protrusions on the end plate assembly for interlocking connection, the problems of consistent cell preload and excess adhesive control are solved, the installation accuracy and connection stability of the cell unit are improved, the stress risk of the liquid cooling plate is reduced, and the efficient connection of the battery pack is achieved.

CN224232825UActive Publication Date: 2026-05-12HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Filing Date
2025-05-29
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

In existing battery packs, it is difficult to ensure the consistency of cell preload, the height of adhesive overflow on the end plate is not easy to control, there is a risk of contamination during the adhesive filling process, and the stress near the screw holes of the liquid cooling plate is high, which poses a risk of failure.

Method used

Grooves and protrusions are provided on the end plate assembly. The grooves and protrusions are connected by interlocking, and combined with the limiting assembly, the installation positioning accuracy and stability of the cell unit are improved, and the stress on the liquid cooling plate is reduced.

Benefits of technology

It improves the reliability, convenience and stability of cell unit connection, reduces the stress risk of liquid cooling plate, and improves the system rigidity of battery pack.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a battery pack and a vehicle, and particularly relates to the technical field of batteries. The battery pack comprises a battery box body, a battery cell unit and an end plate assembly, wherein the battery cell unit is positioned in the battery box body. The end plate assemblies are located on the two sides of the battery cell units in the first direction and fixedly connected with the battery cell units. The end plate assembly is provided with a groove and a protruding part, and the groove and the protruding part are connected in a clamped mode. Therefore, according to the battery pack provided by the embodiment of the invention, the grooves and the lug bosses are arranged on the end plate assemblies, so that the accuracy of mounting and positioning the battery cell units can be improved, and the reliability, convenience and stability of connection of the battery cell units are improved.
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Description

Technical Field

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

[0002] With technological advancements and increasing demand for renewable energy, power batteries have been widely used in numerous fields, including electric vehicles, renewable energy storage, consumer electronics, and industrial equipment. Among these, the battery pack, as the core component of a power battery system, is currently the primary method for integrating power batteries.

[0003] Cell-to-pack (CTP) assembly technology offers advantages over traditional cell-to-module (CTM) assembly technology, including higher energy density and lower cost. In CTP battery packs, the liquid cooling plate is a primary load-bearing component. The connection between the liquid cooling plate and the casing frame and crossbeams is typically achieved using flow drill screws (FDS) technology. This can lead to high stress near the screw holes on the liquid cooling plate, posing a risk of failure.

[0004] To enhance the connection between the battery cells and the crossbeams and reduce the stress on the liquid cooling plate, methods such as increasing the cell preload, applying adhesive overflow to the bottom of the end plate, and potting adhesive into the end plate are commonly used. However, in existing battery packs, increasing the cell preload is unreliable due to the thickness differences among the cells, making it difficult to guarantee the consistency of the resulting preload. Applying adhesive overflow to the bottom of the end plate is also problematic because the flowability of the thermally conductive adhesive varies over time, making the overflow height unpredictable and impossible to monitor. Potting adhesive into the end plate also presents flowability issues. Furthermore, dripping thermally conductive adhesive during potting may contaminate the inside of the battery pack. Utility Model Content

[0005] This application provides a battery pack and a vehicle. By providing grooves and protrusions on the end plate assembly, the accuracy of cell unit installation and positioning can be improved, thereby enhancing the reliability, convenience, and stability of cell unit connection.

[0006] The first aspect of this application provides a battery pack, comprising:

[0007] Battery housing;

[0008] The battery cell unit is located inside the battery casing.

[0009] End plate assembly, the end plate assembly is located on both sides of the cell unit in the first direction and is fixedly connected to the cell unit;

[0010] The end plate assembly has grooves and protrusions that engage with each other.

[0011] The battery pack provided in the first aspect of this application includes a battery housing, battery cells, and end plate assemblies. The battery cells are located within the battery housing. The end plate assemblies are located on both sides of the battery cells in a first direction and are fixedly connected to them. The end plate assemblies have grooves and protrusions that engage with each other. Thus, the battery pack provided in this application, by providing grooves and protrusions on the end plate assemblies, improves the accuracy of battery cell installation and positioning, and enhances the reliability, convenience, and stability of battery cell connection.

[0012] In one possible implementation, the end plate assembly includes a first end plate and a second end plate, one side of the first end plate is fixedly connected to the cell unit, and the other side of the first end plate is provided with a protrusion.

[0013] The second end plate has a groove on the side facing the first end plate, and the groove is arranged in correspondence with the protrusion.

[0014] In one possible implementation, it further includes: a limiting component, the limiting component including a limiting recess and a limiting protrusion, the limiting recess and the limiting protrusion being disposed opposite to each other;

[0015] The limiting recess is provided on the protrusion, and the limiting protrusion is provided on the groove. The limiting recess and the limiting protrusion are engaged and connected.

[0016] In one possible implementation, the protrusion has a first end and a second end, the first end extending through the first end plate in a third direction, and the second end having a limiting recess.

[0017] The groove has a third end and a fourth end. The third end extends through the second end plate in a third direction, and the fourth end is provided with a limiting protrusion.

[0018] In one possible implementation, the battery housing includes at least two crossbeams, which are respectively located on both sides of the battery cell in a first direction;

[0019] The crossbeam is located on the side of the end plate assembly facing away from the cell unit.

[0020] In one possible implementation, it further includes: a partition, the partition being located between the crossbeam and the end plate assembly;

[0021] The crossbeam is fixedly connected to the second end plate via a partition.

[0022] In one possible implementation, the second end plate has a plurality of structural connecting arms on the side facing the crossbeam, and the plurality of structural connecting arms enclose a plurality of structural cavities.

[0023] In one possible implementation, it further includes: a liquid cooling plate located below the battery cell;

[0024] The liquid cooling plate is fixedly connected to the battery cell unit by adhesive.

[0025] In one possible implementation, the battery housing further includes: a housing frame;

[0026] The enclosure frame has a mounting cavity in which the battery cell unit, end plate assembly, crossbeam and liquid cooling plate are located.

[0027] A second aspect of this application provides a vehicle including the battery pack described above.

[0028] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here.

[0029] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by a battery pack and vehicle provided by this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0030] 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 of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0032] Figure 2 An exploded view of the battery pack provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the second end plate of the battery pack provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the structure of the first end plate of the battery pack provided in an embodiment of this application;

[0035] Figure 5 A cross-sectional view of the end plate assembly of the battery pack provided in an embodiment of this application;

[0036] Figure 6 A side view of the battery pack provided in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the end plate assembly of the battery pack provided in an embodiment of this application;

[0038] Figure 8 This is a partially exploded view of the battery pack provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100-battery pack;

[0041] 200 - Battery housing; 210 - Crossbeam; 220 - Housing frame; 221 - Mounting cavity; 222 - Mounting hole;

[0042] 300-cell unit;

[0043] 400 - End plate assembly; 410 - First end plate; 411 - Protrusion; 4111 - First end; 4112 - Second end; 420 - Second end plate; 421 - Groove; 4211 - Third end; 4212 - Fourth end; 422 - Structural connecting arm; 423 - Structural cavity;

[0044] 500 - Limiting component; 510 - Limiting recess; 511 - Fixing member; 512 - Cavity; 520 - Limiting protrusion; 521 - Main body; 522 - Extension; 523 - Stepped structure;

[0045] 600-septum;

[0046] 700 - Liquid cooling plate; 710 - Adhesive component. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0048] As described in the background section, in existing battery packs, methods for increasing cell preload are unreliable due to variations in cell thickness, making it difficult to guarantee consistent preload. For methods involving adhesive overflow at the bottom of the end plate, the overflow height cannot be guaranteed or observed because the flowability of the thermally conductive adhesive varies over time. The same flowability issue exists with end plate potting. Furthermore, dripping of thermally conductive adhesive during potting may contaminate the inside of the battery pack.

[0049] To address the aforementioned technical problems, a first aspect of this application provides a battery pack. The battery pack includes a battery housing, battery cells, and end plate assemblies. The battery cells are located within the battery housing. The end plate assemblies are located on both sides of the battery cells in a first direction and are fixedly connected to the battery cells. The end plate assemblies have grooves and protrusions that engage with each other. Thus, the battery pack provided by this application, by providing grooves and protrusions on the end plate assemblies, can improve the accuracy of battery cell installation and positioning, and enhance the reliability, convenience, and stability of battery cell connection.

[0050] A second aspect of this application provides a vehicle. The vehicle includes the battery pack described above.

[0051] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] This application provides a battery pack and a vehicle. By providing grooves and protrusions on the end plate assembly, the accuracy of cell unit installation and positioning can be improved, enhancing the reliability, convenience, and stability of cell unit connection. The specific structure of the battery pack and vehicle provided in this application embodiment will be described below with reference to the accompanying drawings.

[0053] refer to Figure 1 as well as Figure 2This application provides a battery pack 100 in a first aspect. The battery pack 100 may include a battery housing 200, battery cell units 300, and end plate assemblies 400. In one possible implementation, the number of battery cell units 300 can be plurality of, and this application embodiment does not limit the number of battery cell units 300. In this application embodiment, the plurality of battery cell units 300 can all be located in the battery housing 200, and the end plate assemblies 400 can be located on both sides of the battery cell units 300 in a first direction, and the end plate assemblies 400 are fixedly connected to the battery cell units 300.

[0054] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, the end plate assembly 400 may be provided with a groove 421 and a protrusion 411. It is understood that by inserting the groove 421 into the protrusion 411, the groove 421 and the protrusion 411 can be engaged and connected. Thus, the cooperation between the groove 421 and the protrusion 411 improves the accuracy of the battery cell unit 300 installation and positioning, and enhances the reliability, convenience, and stability of the battery cell unit 300 connection.

[0055] Continue to refer to Figure 2 Based on the above embodiments, in one possible implementation, the end plate assembly 400 may further include a first end plate 410 and a second end plate 420. In this embodiment, one side of the first end plate 410 may be fixedly connected to the battery cell unit 300, while the other side of the first end plate 410 may be provided with a protrusion 411. Correspondingly, a groove 421 may be formed on the side of the second end plate 420 facing the first end plate 410. It is understood that the groove 421 is correspondingly provided with the protrusion 411.

[0056] Of course, in other embodiments, the groove 421 may also be formed on the first end plate 410, while the protrusion 411 may be formed on the second end plate 420. This application embodiment is not limited here. In this application embodiment, the first end plate 410 is provided with the protrusion 411 and the second end plate 420 is provided with the groove 421 as an example.

[0057] In one possible implementation, the number of protrusions 411 and grooves 421 can be multiple, and the number of protrusions 411 and grooves 421 is the same. This embodiment of the application does not limit the number of protrusions 411 and grooves 421. In this embodiment, multiple protrusions 411 can be spaced apart and parallel to each other on the first end plate 410 in the second direction. Correspondingly, multiple grooves 421 can also be spaced apart and parallel to each other on the second end plate 420 in the second direction, and each groove 421 can correspond to each protrusion 411, thereby facilitating the engaging connection between the grooves 421 and the protrusions 411.

[0058] In this way, the protrusion 411 on the first end plate 410 and the groove 421 on the second end plate 420 cooperate with each other, so that the first end plate 410 and the second end plate 420 are connected, thereby improving the accuracy of the battery cell unit 300 installation and positioning.

[0059] It should be noted that, for ease of description, in this embodiment, the first direction can be the length direction of the battery housing 200, i.e. Figure 1 The x-direction. The second direction can be the width direction of the battery box 200, i.e. Figure 1 The y-direction. The third direction can be the height direction of the battery box (200), i.e. Figure 1 The z-direction in the equation.

[0060] Continue to refer to Figure 2 Based on the above embodiments, the battery pack 100 may further include a limiting component 500. The limiting component 500 may further include a limiting recess 510 and a limiting protrusion 520, and the limiting recess 510 and the limiting protrusion 520 may be disposed opposite to each other.

[0061] In one possible implementation, the limiting recess 510 can be formed on the protrusion 411, while the limiting protrusion 520 can be provided on the groove 421. It is understood that the limiting recess 510 and the limiting protrusion 520 can be engaged and connected. Thus, through the cooperation of the protrusion 411 and the groove 421, the first end plate 410 and the second end plate 420 can be connected, and furthermore, through the engagement of the limiting recess 510 and the limiting protrusion 520, the first end plate 410 and the second end plate 420 can be fixedly connected.

[0062] refer to Figure 3 Based on the above embodiments, in one possible implementation, the limiting protrusion 520 may include a main body 521 and an extension 522, the main body 521 and the extension 522 are connected, and the extension 522 may extend away from the cell unit 300 in a first direction, thereby forming a stepped structure 523 between the extension 522 and the main body 521.

[0063] Additionally, see reference Figure 4 The limiting recess 510 may include a fixing member 511. The fixing member 511 may form a cavity 512 together with the inner wall of the limiting recess 510, and the fixing member 511 is not connected to the inner wall of the limiting recess 510. Thus, as... Figure 5 As shown, during the engagement of the limiting recess 510 and the limiting protrusion 520, the combination... Figure 3 as well as Figure 4 From this perspective, the stepped structure 523 formed by the extension 522 of the limiting protrusion 520 and the main body 521 can abut against the fixing member 511 of the limiting recess 510, thereby realizing the engaging connection between the limiting recess 510 and the limiting protrusion 520.

[0064] Continue to refer to Figure 4 Based on the above embodiments, in one possible implementation, the protrusion 411 may have a first end 4111 and a second end 4112. The first end 4111 may penetrate the first end plate 410 in a third direction, and the second end 4112 may be provided with a limiting recess 510. Accordingly, referring to... Figure 3 The groove 421 may have a third end 4211 and a fourth end 4212. The third end 4211 may also penetrate the second end plate 420 in a third direction. The fourth end 4212 may be provided with a limiting protrusion 520.

[0065] Of course, in some other embodiments, the limiting recess 510 may be located at other positions of the protrusion 411 in the third direction, and the limiting protrusion 520 may also be formed in other positions of the groove 421 in the third direction. The positions of the limiting recess 510 and the limiting protrusion 520 correspond to each other, and the embodiments of this application are not limited here.

[0066] refer to Figure 6 Based on the above embodiments, the battery pack 100 may further include a crossbeam 210. In one possible implementation, the number of crossbeams 210 may be at least two; however, this application embodiment does not limit the number of crossbeams 210. In this application embodiment, two crossbeams 210 are used as an example. The two crossbeams 210 are respectively located on both sides of the cell unit 300 in the first direction, and each crossbeam 210 is located on the side of the end plate assembly 400 facing away from the cell unit 300. It is understood that the two crossbeams 210 and at least a portion of the inner surface of the battery housing 200 together form an installation space for placing the cell unit 300, thereby facilitating the installation and connection of the cell unit 300.

[0067] Continue to refer to Figure 6Based on the above embodiments, the battery pack 100 may further include a separator 600. In one possible implementation, the separator 600 may be located between the crossbeam 210 and the end plate assembly 400. Exemplarily, the separator 600 may be a double-sided adhesive foam separator 600, thereby enabling the separator 600 to adhesively fix and absorb the expansion force of the battery cell unit 300. It is understood that the crossbeam 210 can be fixedly connected to the second end plate 420 via the separator 600.

[0068] Based on the above embodiments, in one possible implementation, the separator 600 may also be located between the first end plate 410 and the cell unit 300, thereby fixing the first end plate 410 to the cell unit 300 via the separator 600. Alternatively, the separator 600 may also be located between several cell units 300, thereby connecting the several cell units 300 to form a battery module.

[0069] refer to Figure 7 Based on the above embodiments, combined with Figure 2 The second end plate 420 may have a structural connecting arm 422 on the side facing the crossbeam 210. In one possible implementation, the number of structural connecting arms 422 may be several, and this embodiment does not limit the number of structural connecting arms 422. In this embodiment, several structural connecting arms 422 may form several structural cavities 423, and each structural cavity 423 may be rectangular.

[0070] In this way, by providing a number of structural cavities 423 on the side of the second end plate 420 facing the crossbeam 210, the contact area between the second end plate 420 and the crossbeam 210 can be reduced, the degree of heat transfer of the cell unit 300 through the crossbeam 210 can be reduced, and the temperature uniformity of the cell unit 300 can be guaranteed.

[0071] Continue to refer to Figure 2 Based on the above embodiments, the battery pack 100 may further include a liquid cooling plate 700. The liquid cooling plate 700 may be located below the battery cell 300. In this embodiment, the liquid cooling plate 700 and the battery cell 300 are fixedly connected by an adhesive 710. Exemplarily, the adhesive 710 may be a thermally conductive structural adhesive, but this embodiment is not limited thereto. It is understood that the liquid cooling plate 700 can provide load-bearing and heat dissipation for the battery cell 300. Furthermore, the thermally conductive structural adhesive can transfer the heat generated by the battery cell 300 to the liquid cooling plate 700 for heat dissipation, and also reliably connect the battery cell 300 to the liquid cooling plate 700.

[0072] refer to Figure 8Based on the above embodiments, the battery housing 200 may further include a housing frame 220. The housing frame 220 may have a mounting cavity 221. In this embodiment, combined with... Figure 2 As can be seen, the battery cell unit 300, end plate assembly 400, crossbeam 210, and liquid cooling plate 700 can all be located in the mounting cavity 221. Exemplarily, the housing frame 220 and crossbeam 210 can be fixedly connected by welding. The liquid cooling plate 700 can be fixedly connected to the housing frame 220 and crossbeam 210 respectively using flow drill screw (FDS) technology.

[0073] Continue to refer to Figure 1 Based on the above embodiments, the housing frame 220 may be provided with a plurality of mounting holes 222. It is understood that the mounting holes 222 are used for hoisting the battery pack 100, thereby fixing the battery pack 100 to the vehicle.

[0074] In this embodiment, during the assembly of the battery pack 100, the second end plate 420 is first bonded and fixed to the crossbeam 210 using a spacer 600. Then, the battery module formed by the first end plate 410 and several cell units 300 is placed in the battery housing 200. This ensures a stable and effective connection between the cell units 300 and the crossbeam 210, reducing the stress on the liquid cooling plate 700 and improving the overall system rigidity of the battery pack 100. Furthermore, the protrusion 411 of the first end plate 410 and the groove 421 of the second end plate 420 engage with each other until the limiting recess 510 on the protrusion 411 and the limiting protrusion 520 on the groove 421 are locked together, thus completing the assembly of the battery pack 100.

[0075] This application provides a vehicle (not shown in the figures) in a second aspect. The vehicle may include the battery pack 100 described above.

[0076] In this embodiment of the application, the battery pack 100 provided in this embodiment of the application can improve the accuracy of the installation and positioning of the cell unit 300 by providing a groove 421 and a protrusion 411 on the end plate assembly 400, thereby improving the reliability, convenience and stability of the connection of the cell unit 300.

[0077] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0078] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0079] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0080] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0081] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0082] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: Battery housing (200); A battery cell unit (300) is located in the battery housing (200); End plate assembly (400), the end plate assembly (400) is located on both sides of the cell unit (300) in a first direction and is fixedly connected to the cell unit (300); The end plate assembly (400) is provided with a groove (421) and a protrusion (411), and the groove (421) and the protrusion (411) are engaged and connected.

2. The battery pack according to claim 1, characterized in that, The end plate assembly (400) includes a first end plate (410) and a second end plate (420). One side of the first end plate (410) is fixedly connected to the battery cell unit (300), and the other side of the first end plate (410) is provided with the protrusion (411). The second end plate (420) has a groove (421) on the side facing the first end plate (410), and the groove (421) is correspondingly provided with the protrusion (411).

3. The battery pack according to claim 2, characterized in that, Also includes: A limiting component (500) includes a limiting recess (510) and a limiting protrusion (520), the limiting recess (510) and the limiting protrusion (520) being disposed opposite to each other; The limiting recess (510) is provided on the protrusion (411), and the limiting protrusion (520) is provided on the groove (421). The limiting recess (510) and the limiting protrusion (520) are engaged and connected.

4. The battery pack according to claim 3, characterized in that, The protrusion (411) has a first end (4111) and a second end (4112). The first end (4111) extends through the first end plate (410) in a third direction, and the second end (4112) is provided with the limiting recess (510). The groove (421) has a third end (4211) and a fourth end (4212). The third end (4211) extends through the second end plate (420) in a third direction, and the fourth end (4212) is provided with the limiting protrusion (520).

5. The battery pack according to any one of claims 2-4, characterized in that, The battery housing (200) includes at least two crossbeams (210), the at least two crossbeams (210) being located on both sides of the battery cell unit (300) in the first direction; The crossbeam (210) is located on the side of the end plate assembly (400) facing away from the cell unit (300).

6. The battery pack according to claim 5, characterized in that, Also includes: A partition (600) is located between the crossbeam (210) and the end plate assembly (400); The crossbeam (210) is fixedly connected to the second end plate (420) via the partition (600).

7. The battery pack according to claim 5, characterized in that, The second end plate (420) has a plurality of structural connecting arms (422) on the side facing the crossbeam (210), and the plurality of structural connecting arms (422) are arranged to form a plurality of structural cavities (423).

8. The battery pack according to claim 5, characterized in that, Also includes: A liquid cooling plate (700) is located below the battery cell unit (300); The liquid cooling plate (700) and the battery cell unit (300) are fixedly connected by an adhesive (710).

9. The battery pack according to claim 8, characterized in that, The battery housing (200) also includes: housing frame (220); The housing frame (220) has a mounting cavity (221), in which the battery cell unit (300), the end plate assembly (400), the crossbeam (210) and the liquid cooling plate (700) are all located.

10. A vehicle, characterized in that, Includes the battery pack (100) as described in any one of claims 1-9 above.