Battery pack

Abstract

The utility model discloses a battery pack, which comprises a lower box body, an upper box body, a lower box body and an upper box body, the battery module comprises two end plates and a plurality of single batteries, the single batteries are arranged in a stacked mode in the first direction, the two end plates are arranged on the two sides of the single batteries in the first direction respectively, the end plates and the single batteries are fixed through binding bands, and the battery module is detachably connected with the bottom plate through the end plates. According to the battery pack disclosed by the utility model, the lower box body and the battery module are arranged, the battery module comprises the end plate and the plurality of battery monomers, the end plate is fixed with the plurality of battery monomers through the binding bands, and the battery module is detachably connected with the bottom plate of the lower box body through the end plate, so that the battery pack is convenient and easy to disassemble during maintenance; according to the battery pack provided by the invention, the plurality of single batteries in the battery module can be conveniently and independently replaced, so that the maintenance and replacement cost of the battery pack is well reduced, the battery pack is more convenient and easier to maintain, and the use experience of a user is better.

Description

Technical Field

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

[0002] With the rapid development of technology and the progress of society, vehicles are being updated and iterated at an increasingly faster pace. While pursuing safety, users are also paying more and more attention to the user experience.

[0003] In related technologies, vehicle battery packs are constructed by directly integrating individual battery cells within the pack. These cells are bonded together with each other and to the pack's base or side panels using thermally conductive adhesive. This makes disassembly and repair difficult when the battery pack malfunctions. Individual cells are difficult to remove and replace, and disassembled cells may become unusable, necessitating the replacement of the entire battery pack. This results in high repair costs for users and a poor user experience. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a battery pack in which individual battery cells can be easily disassembled, allowing for convenient replacement of individual battery cells during battery pack maintenance. This reduces maintenance costs and improves the user experience.

[0005] The battery pack according to this utility model includes: a lower housing, the lower housing including a base plate; a battery module, the battery module including end plates and multiple battery cells, the multiple battery cells being stacked along a first direction, the number of end plates being two, the two end plates being respectively disposed on both sides of the multiple battery cells in the first direction, the end plates being fixed to the multiple battery cells by straps, and the battery module being detachably connected to the base plate through the end plates.

[0006] According to the present invention, the battery pack is provided with a lower housing and a battery module. The battery module includes an end plate and multiple battery cells. The end plate and multiple battery cells are fixed together by straps. The battery module is detachably connected to the bottom plate of the lower housing through the end plate. This makes it easy to disassemble the battery pack during maintenance and allows the multiple battery cells in the battery module to be easily replaced individually. This significantly reduces the maintenance and replacement cost of the battery pack, making maintenance more convenient and easier, and improving the user experience.

[0007] In some embodiments of this utility model, the end plate is snapped to the base plate, and / or the end plate is riveted to the base plate.

[0008] In one embodiment of this utility model, one of the end plate and the base plate is provided with a buckle and the other is provided with a slot, and the end plate and the base plate are engaged by the buckle and the slot.

[0009] In some examples of this utility model, the end plate is provided with the buckle, the buckle has a snap-fit ​​portion, the bottom plate is provided with the slot, and the snap-fit ​​portion extends into the slot along the first direction.

[0010] In one example of this utility model, in the first direction, the latches on the two end plates are arranged facing each other.

[0011] In one example of this utility model, the end plate is provided with one or more of the buckles. When there are multiple buckles, the multiple buckles are arranged at intervals along the second direction. There are multiple slots, and the multiple slots are arranged in one-to-one correspondence with the multiple buckles. The second direction intersects with the first direction.

[0012] In some embodiments of this utility model, the lower housing further includes: a frame, the frame extending in a ring shape along the circumference of the base plate, the frame and the base plate cooperating to define a receiving cavity, the base plate being a first cold plate; and a second cold plate, the second cold plate extending along a third direction and being multiple in number, the multiple second cold plates being located within the receiving cavity and arranged along the circumference of the battery module, the third direction intersecting with the first direction.

[0013] In one embodiment of the present invention, a plurality of second cold plates are arranged along the circumference of the battery module and connected end to end. The plurality of second cold plates cooperate with the base plate to define a cooling cavity, and the battery module is disposed in the cooling cavity.

[0014] In some examples of this utility model, the battery pack further includes a cover that covers the opening of the cooling chamber, the cover is detachably connected to a plurality of second cold plates, and the cover is provided with a pressure relief hole.

[0015] In one embodiment of this utility model, the frame, the base plate, and the second cold plate are an integral piece.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a battery module according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the lower housing according to an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of the cooling cavity formed by removing a set of second cold plates from the lower housing according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the cover according to an embodiment of the present utility model.

[0021] Figure label:

[0022] 10. Lower housing; 101. Receiving cavity; 102. Cooling cavity;

[0023] 11. Frame; 12. Base plate; 121. Slot; 13. Second cold plate;

[0024] 20. Battery module;

[0025] 21. End plate; 211. Clip; 22. Battery cell; 23. Binding strap;

[0026] 30. Cover; 301. Pressure relief hole; 31. Reinforcing plate. Detailed Implementation

[0027] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] Reference below Figures 1-4 A battery pack according to an embodiment of the present invention is described.

[0029] like Figures 1-4 As shown, the battery pack according to an embodiment of the present invention includes: a lower housing 10 and a battery module 20. The lower housing 10 includes a base plate 12; the battery module 20 includes an end plate 21 and a plurality of battery cells 22, the plurality of battery cells 22 being arranged along a first direction (e.g., ...). Figure 1 The battery module 20 is arranged in a stacked manner (shown in the front-to-back direction). There are two end plates 21. The two end plates 21 are respectively located on both sides of the multiple battery cells 22 in the first direction. The end plates 21 and the multiple battery cells 22 are fixed by straps 23. The battery module 20 is detachably connected to the base plate 12 through the end plates 21.

[0030] In this embodiment, the battery includes a lower housing 10 and a battery module 20. The battery module 20 includes an end plate 21 and multiple battery cells 22. The end plate 21 and the multiple battery cells 22 are fixed by straps 23. The structure is simple and easy to assemble. For example, when assembling the battery module 20, after the multiple battery cells 22 are stacked along the first direction, the two end plates 21 can be arranged on both sides of the multiple battery cells 22 in the first direction. The straps 23 bind and fix the two end plates 21 and the multiple battery cells 22, so that the end plates 21 and the multiple battery cells 22 can be easily and stably transported and assembled onto the bottom plate 12 of the lower housing 10. The end plates 21 can bear the fastening force of the straps 23 when they are tightened and evenly transmitted to the battery cells 22, so that the multiple battery cells 22 can maintain a stable structural state.

[0031] In this embodiment, the battery module 20 is detachably connected to the base plate 12 via the end plate 21. The structure is simple and easy to disassemble, allowing the battery module 20 to be stably fixed to the base plate 12. For example, the end plate 21 and the base plate 12 can be fastened together with fasteners, snap-fitted together, or riveted together. This allows the battery module 20 to be easily removed from the base plate 12 when one or more battery cells 22 in the battery module 20 fail. The faulty battery cell 22 can then be removed from the battery module 20 by removing the strap 23 and replaced. This avoids the need to replace the entire battery module 20 or even the entire battery pack, significantly reducing the maintenance cost of the battery pack and improving the user experience.

[0032] During battery pack assembly, the battery module 20 is detachably connected to the base plate 12 via the end plate 21, so that the battery module 20 is stably assembled and fixed in the lower housing 10. In the event of a battery pack failure, the battery module 20 can be easily removed from the lower housing 10 as a whole. The binding strap 23 can then be removed from the battery module 20, allowing multiple battery cells 22 to be flexibly replaced individually as needed.

[0033] According to the embodiment of the present utility model, the battery pack is provided with a lower housing 10 and a battery module 20. The battery module 20 includes an end plate 21 and multiple battery cells 22. The end plate 21 and the multiple battery cells 22 are fixed by a strap 23. The battery module 20 is detachably connected to the bottom plate 12 of the lower housing 10 through the end plate 21. This makes it easy to disassemble the battery pack during maintenance and allows the multiple battery cells 22 in the battery module 20 to be easily replaced individually. This greatly reduces the maintenance and replacement cost of the battery pack, makes the maintenance of the battery pack more convenient and easier, and improves the user experience.

[0034] In some embodiments of this utility model, reference is made to Figure 1 and Figure 3As shown, the end plate 21 and the base plate 12 can be snapped together.

[0035] In this embodiment, the end plate 21 and the bottom plate 12 are snapped together, which is simple in structure and easy to assemble. This makes it easier to assemble and disassemble the battery module 20 and the lower housing 10, and allows for convenient and quick disassembly of the battery pack during disassembly and maintenance, thus making the maintenance of the battery pack easier and more efficient.

[0036] In some embodiments of this utility model, the end plate 21 and the base plate 12 can be riveted together.

[0037] In this embodiment, the end plate 21 and the base plate 12 are riveted together, which is simple in structure and easy to disassemble and assemble, making the battery pack more convenient and easy to maintain. The riveting of the end plate 21 and the base plate 12 makes the assembly and fixation of the battery module 20 and the base plate 12 stable and reliable, so that the battery module 20 can be stably assembled and fixed in the battery pack.

[0038] In some embodiments of this utility model, reference is made to Figure 1 and Figure 3 As shown, the end plate 21 and the base plate 12 can be snapped together, or the end plate 21 and the base plate 12 can be riveted together.

[0039] In this embodiment, the end plate 21 and the base plate 12 are snapped together and riveted together, making the end plate 21 and the base plate 12 more securely fixed, so that the battery module 20 can be more stably and reliably assembled and fixed in the battery pack.

[0040] In one embodiment of this utility model, reference is made to Figure 1 and Figure 3 As shown, one of the end plate 21 and the base plate 12 may be provided with a buckle 211 and the other with a slot 121. The end plate 21 and the base plate 12 are engaged by the buckle 211 and the slot 121.

[0041] In this embodiment, the end plate 21 and the base plate 12 are connected by a snap-fit ​​211 and a slot 121, which is simple in structure and easy to process, making it easy to assemble and disassemble the end plate 21 and the base plate 12, thus making it easier to disassemble and repair the battery pack. For example, the end plate 21 can be provided with a snap-fit ​​211, and the base plate 12 can be provided with a slot 121, or the end plate 21 can be provided with a slot 121, and the base plate 12 can be provided with a corresponding snap-fit ​​211. The arrangement of the slot 121 and the snap-fit ​​211 can be reasonably set according to needs.

[0042] In some examples of this utility model, references Figure 1 and Figure 3 As shown, the end plate 21 may be provided with a buckle 211, the buckle 211 has a snap-fit ​​part, and the bottom plate 12 is provided with a slot 121, the snap-fit ​​part extends into the slot 121 along the first direction.

[0043] In this embodiment, a buckle 211 is provided on the end plate 21. The snap-fit ​​portion of the buckle 211 extends into the slot 121 along the first direction, so that the buckle 211 and the slot 121 are snap-fitted together in the first direction. The structure is simple and facilitates the snap-fit ​​assembly of the battery module 20 with the base plate 12 along the first direction. When the battery module 20 is assembled with the base plate 12, the battery module 20 as a whole can move along the first direction, so that the snap-fit ​​portion of the buckle 211 moves to the opening of the slot 121. The snap-fit ​​portion of the buckle 211 extends into the slot 121 along with the moving portion of the battery module 20 and snaps into the slot 121, thereby snapping the battery module 20 onto the base plate 12.

[0044] In one example of this utility model, reference is made to Figure 1 and Figure 3 As shown, the card slot 121 can extend along a first direction, and one end of the card slot 121 forms an opening on the side surface of the base plate 12 facing the battery module 20. In the first direction, the snap-fit ​​portion can extend along a downwardly protruding arc and extend into the card slot 121 from the opening.

[0045] In this embodiment, the slot 121 forms an opening on the side surface of the base plate 12 facing the battery module 20. That is, the slot 121 is formed inside the base plate 12. The side surface of the base plate 12 facing the battery module 20 can form a continuous plane at the slot 121. The opening of the slot 121 on the side surface of the base plate 12 facing the battery module 20 avoids the slot 121 forming a protruding structure on the base plate 12 and rubbing against the end plate 21 or battery cell 22 of the battery module 20, so that the battery module 20 can be smoothly assembled onto the base plate 12.

[0046] In this embodiment, the snap-fit ​​portion extends along a downwardly protruding arc, which allows the snap-fit ​​portion to smoothly enter the slot 121 from the opening and engage with the slot 121 during the snap-fit ​​process. It also makes the extension distance of the snap-fit ​​portion in the thickness direction of the base plate 12 shorter, thereby making the size of the slot 121 in the thickness direction of the base plate 12 smaller, making the slot 121 easier to process, and allowing the base plate 12 to maintain good structural strength at the slot 121, so that the base plate 12 can stably support the battery module 20.

[0047] Optionally, the side wall of the slot 121 opposite to the opening of the base plate 12 can be formed as an arc surface. This allows the snap-fit ​​part of the buckle 211 to more smoothly and easily extend into the slot 121 and engage with it, making the snap-fit ​​fixing of the end plate 21 and the base plate 12 more stable and reliable.

[0048] In one example of this utility model, in a first direction, the buckles 211 on the two end plates 21 can be arranged facing each other.

[0049] In this embodiment, the buckles 211 on the two end plates 21 are arranged facing each other in the first direction, so that after the battery module 20 is snapped into the base plate 12, the buckles 211 on the two end plates 21 engage with the slots 121 in opposite directions. For example, the engaging parts of the buckles 211 on the two end plates 21 are both engaged with the battery module 20 and the slots 121 in the first direction. When the battery module 20 moves in the direction of one of the end plates 21 in the first direction, the buckles 211 on the other end plate 21 can engage with the slots 121 to limit the displacement of the battery module 20, so that the battery module 20 can be better limited and fixed in the first direction, and the battery module 20 can be more stably assembled and fixed in the battery pack, so that the battery pack operates stably.

[0050] In one example of this utility model, reference is made to Figure 1 As shown, one or more latches 211 may be provided on the end plate 21. When there are multiple latches 211, the multiple latches 211 are arranged along the second direction (e.g., Figure 1 The two directions are arranged at intervals (as shown in the left and right directions). There are multiple slots 121, and multiple slots 121 are arranged in a one-to-one correspondence with multiple buckles 211. The second direction intersects with the first direction.

[0051] In this embodiment, the end plate 21 is provided with one or more buckles 211. When multiple buckles 211 are provided on the end plate 21, the multiple buckles 211 are arranged at intervals along the second direction, and the slots 121 are arranged in a one-to-one correspondence with the buckles 211. The structure is simple, making the end plate 21 and the base plate 12 more stable and reliable in their snap-fit ​​connection. When the end plate 21 is provided with one buckle 211, there can also be one slot 121 that mates with the buckle. For example, the buckle 211 can extend along the second direction, and the slot 121 can also extend along the second direction, so that the buckle 211 and the slot 121 have a large snap-fit ​​surface, thereby making the end plate 21 and the base plate 12 stably and reliably snap-fit ​​connected. For example, the number of buckles 211 on the end plate 21 can be two, three, four, etc., and the multiple buckles 211 can be arranged at intervals along the second direction. The number of buckles 211 can be reasonably set according to actual needs.

[0052] In this embodiment, the second direction intersects with the first direction, which is intended to show that the first direction and the second direction can be arranged perpendicularly, or they can be arranged to intersect but not perpendicularly, that is, they can intersect at an acute angle or an obtuse angle.

[0053] In some examples of this utility model, such as Figure 1As shown, the buckle 211 can be located on the side of the end plate 21 facing away from the battery cell 22 in the first direction. This allows the slot 121 that mates with the buckle 211 to be arranged on the base plate 12 away from the battery cell 22, thereby providing stable and reliable support for the battery cell 22 and enabling the battery module 20 to be assembled into the battery pack more stably and reliably.

[0054] In some embodiments of this utility model, reference is made to Figure 1 and Figure 2 As shown, the lower housing 10 may further include: a frame 11 and a second cold plate 13. The frame 11 extends in a ring shape along the circumference of the bottom plate 12, and the frame 11 and the bottom plate 12 cooperate to define the receiving cavity 101. The bottom plate 12 is the first cold plate; the second cold plate 13 extends along a third direction (e.g., ...). Figure 2 The number of second cold plates 13 extends in the vertical direction shown, and the multiple second cold plates 13 are located in the receiving cavity 101 and arranged along the circumference of the battery module 20. The third direction intersects with the first direction.

[0055] In this embodiment, the lower housing 10 includes a frame 11 and a second cold plate 13. The frame 11 and the bottom plate 12 cooperate to define the receiving cavity 101. The structure is simple and can meet the assembly and use requirements of the battery pack.

[0056] In this embodiment, the base plate 12 is configured as a first cold plate, enabling it to cool and dissipate heat from the battery module 20. Multiple second cold plates 13 are arranged circumferentially around the battery module 20, allowing them to cool and dissipate heat in the circumferential direction. This combined cooling effect of the base plate 12 and the second cold plates 13 significantly improves the heat dissipation rate of the battery module 20, resulting in more stable and reliable operation. For example, the number of second cold plates 13 can be two, three, four, five, etc. Optionally, both the base plate 12 and the second cold plates 13 can be liquid-cooled plates, further enhancing the cooling and heat dissipation of the battery module 20.

[0057] In this embodiment, the third direction intersects with the first direction to illustrate that the third direction and the first direction can be arranged perpendicularly, or they can be arranged to intersect at an acute or obtuse angle. Optionally, the third direction can be a vertical direction, and the third direction intersects with the second direction.

[0058] In one embodiment of this utility model, reference is made to Figure 1 and Figure 2 As shown, multiple second cold plates 13 are arranged along the circumference of the battery module 20 and connected end to end. The multiple second cold plates 13 cooperate with the base plate 12 to define the cooling cavity 102, and the battery module 20 is disposed in the cooling cavity 102.

[0059] In this embodiment, multiple second cold plates 13 cooperate with the base plate 12 to form a cooling cavity 102, so that the battery module 20 can be cooled and dissipated by the second cold plates 13 in the circumferential direction. The cooling rate is higher, and the battery module 20 can get better heat dissipation and cooling effect, thereby improving the charging efficiency of the battery pack to a certain extent, shortening the charging time of the battery pack, and thus improving the user experience.

[0060] In this embodiment, the cooling cavity 102 can effectively separate the battery module 20 from other components in the receiving cavity 101, providing the battery module 20 with a better operating environment, thereby making the battery module 20 operate more stably and the battery pack operate more stably and reliably.

[0061] In some examples of this utility model, references Figure 2 As shown, there can be multiple cooling chambers 102 and multiple battery modules 20, with each battery module 20 corresponding to a different cooling chamber 102. This allows each battery module 20 to directly exchange heat with the second cold plate 13, preventing a decrease in heat dissipation due to a lack of cooling structure between adjacent battery modules 20 when multiple battery modules 20 are arranged in the same cooling chamber 102. This ensures stable and efficient heat exchange for the battery modules 20. For example, there can be two, three, four, etc., and the number of cooling chambers 102 can be reasonably set according to the design and usage requirements of the battery pack. Adaptively, the slots 121 on the base plate 12 can be arranged according to the position of the end plate 21 and the number of clips 211.

[0062] In some examples of this utility model, references Figure 2 and Figure 4 As shown, the battery pack may also include a cover 30, which covers the opening of the cooling chamber 102. The cover 30 is detachably connected to a plurality of second cold plates 13, and the cover 30 is provided with a pressure relief hole 301.

[0063] In this embodiment, a cover 30 is provided over the opening of the cooling chamber 102, thereby forming a closed cavity structure in the cooling chamber 102. This allows the battery module 20 to operate in a more stable and superior environment, making the operation of the battery module 20 more stable. The cover 30 is detachably connected to multiple second cold plates 13. Specifically, the cover 30 is detachably connected to multiple second cold plates 13 constituting the cooling chamber 102, so that when the battery pack is disassembled and maintained, the cover 30 can be easily opened to remove the battery module 20 from the base plate 12 and perform individual battery cell 22 replacement operations, making the maintenance of the battery pack more convenient and easier.

[0064] In this embodiment, a pressure relief hole 301 is provided on the cover 30. This allows high-temperature gas to flow out of the cooling chamber 102 quickly and promptly through the pressure relief hole 301 when thermal runaway occurs in the battery module 20, thereby reducing the damage caused by high-temperature gas to the battery module 20 and improving the safety of the battery pack. Optionally, the pressure relief hole 301 can be arranged directly opposite the pressure relief valve of the battery cell 22. This shortens the path between the pressure relief hole 301 and the pressure relief valve, allowing high-temperature gas to flow to the pressure relief hole 301 and out more quickly.

[0065] Optionally, the pressure relief hole 301 can extend along the first direction, so that the pressure relief hole 301 can cover the pressure relief valve of multiple battery cells 22, so that when thermal runaway occurs in battery cells 22 at different locations among the multiple battery cells 22, high-temperature gas can flow out stably and quickly from the pressure relief hole 301.

[0066] In one example of this utility model, the cover 30 can be fastened to multiple second cold plates 13. In this embodiment, the cover 30 is fastened to multiple cold plates, which is simple in structure, firmly fixed, and easy to disassemble, so that the cover 30 can stably and reliably seal the cooling cavity 102.

[0067] In one example of this utility model, such as Figure 4 As shown, the cover 30 may be provided with a reinforcing plate 31, which may include a first reinforcing plate and a second reinforcing plate. The first reinforcing plate extends along a first direction to both ends of the cover 30, and the second reinforcing plate may extend along a second direction to both ends of the cover 30.

[0068] In this embodiment, a first reinforcing plate and a second reinforcing plate are provided on the cover 30, which can play a good role in structural reinforcement of the cover 30, so that the cover 30 can more stably and reliably seal the cooling cavity 102.

[0069] In one embodiment of this utility model, the frame 11, the base plate 12, and the second cold plate 13 can be an integral piece. This improves the overall structural strength of the lower housing 10 and the second cold plate 13, makes assembly easier, and allows for better heat conduction between the second cold plate 13 and the base plate 12, thereby providing better heat dissipation and cooling for the battery module 20.

[0070] In some embodiments of the present invention, Figure 1 As shown, there can be multiple straps 23. A portion of the multiple straps 23 forms a first strap, and another portion of the multiple straps 23 forms a second strap. In the second direction, the first strap can bind and fix the end plate 21 to the multiple battery cells 22 around the circumference of the battery module 20. In the third direction, the second strap can bind and fix the end plate 21 to the multiple battery cells 22 around the circumference of the battery module 20.

[0071] In this embodiment, the first and second binding straps secure the end plate 21 to the battery cell 22 in the second and third directions, respectively, making the multiple battery cells 22 more firmly fixed to the end plate 21. For example, the number of first binding straps can be two, three, four, etc., and the number of second binding straps can be two, three, four, etc., which can be reasonably set according to needs. Optionally, the number of first binding straps is two, and the number of second binding straps is two. The two first binding straps can be arranged at intervals in the second direction, and the two second binding straps can be arranged at intervals in the third direction.

[0072] The following will refer to Figures 1-4 This invention describes a battery pack according to a specific embodiment of the present invention.

[0073] like Figures 1-4 As shown, the battery pack includes a lower housing 10, a battery module 20, and a cover 30.

[0074] The lower housing 10 includes a base plate 12, a frame 11, and eight second cold plates 13. The frame 11 and the base plate 12 cooperate to define a receiving cavity 101. The base plate 12 is a first cold plate and a liquid-cooled plate. A slot 121 is provided on the base plate 12. The second cold plates 13 are liquid-cooled plates and are located in the receiving cavity 101. Four second cold plates 13 are grouped together with the base plate 12 to define a cooling cavity 102. The eight second cold plates 13 cooperate with the base plate 12 to form two cooling cavities 102. The two cooling cavities 102 are arranged at intervals in the second direction.

[0075] There are two covers 30, which respectively cover the openings of the two cooling chambers 102. The covers 30 are fastened to the second cold plate 13 by bolts. For example, bolt holes can be opened on the covers 30 and the second cold plate 13. Multiple bolt holes are arranged at intervals along the circumference of the opening of the cooling chamber 102. Bolts can pass through the bolt holes on the covers 30 and be threadedly connected to the bolt holes on the second cold plate 13.

[0076] The battery module 20 includes two end plates 21, multiple battery cells 22, and straps 23. The multiple battery cells 22 are stacked along a first direction. The two end plates 21 are respectively arranged on both sides of the multiple battery cells 22 in the first direction. The straps 23 include a first strap and a second strap. There are two first straps, which bind and fix the end plates 21 and the multiple battery cells 22 in a second direction. There are two second straps, which bind and fix the end plates 21 and the multiple battery cells 22 in a third direction. For example, the end plates 21 may be provided with mating holes. The straps 23 pass through the mating holes and bind and fix the end plates 21 and the multiple battery cells 22 to facilitate the positioning of the straps 23 and the end plates 21. The mating holes also play a certain limiting role for the straps 23, making it easier and more reliable to bind the end plates 21 and the multiple battery cells 22 with the straps 23.

[0077] The end plate 21 is provided with two buckles 211, which are arranged at intervals along the second direction. The slots 121 are arranged in a one-to-one correspondence with the buckles 211. The buckles 211 on the two end plates 21 are arranged facing each other in the first direction. The end plate 21 can be provided with weight reduction holes to reduce weight while maintaining sufficient structural strength, thereby playing a certain role in improving the weight energy density of the battery pack.

[0078] During battery pack assembly, the end plate 21 and multiple battery cells 22 are fixed together by straps 23 to form a battery module 20. The battery module 20 is placed into the cooling cavity 102 and fixed to the bottom plate 12 by the buckle 211 on the end plate 21 and the slot 121 on the bottom plate 12. The two sides of the battery module 20 in the second direction can have a small gap with the side wall of the cooling cavity 102 to improve the cooling heat exchange effect. The cover 30 is placed over the opening of the cooling cavity 102 and is fastened to the second cold plate 13 by bolts.

[0079] When the battery pack is in operation, the four second cooling plates 13 surrounding the battery module 20 work together with the base plate 12 to cool and dissipate heat on multiple sides and the bottom of the battery module 20, so that the battery module 20 can achieve a good heat dissipation effect.

[0080] When the battery pack malfunctions and requires repair, after the cover 30 is removed, the battery module 20 can be easily separated from the base plate 12 from the cooling cavity 102. After the binding strap 23 is removed from the battery module 20, the multiple battery cells 22 in the battery module 20 can be easily replaced and repaired individually as needed. Compared with the base plate 12 being glued to the battery cells 22 or the second cooling plate 13 being glued to the battery cells 22, the battery cells 22 can be easily removed from the battery module 20, which effectively avoids the difficulty of removing the battery cells 22 and the need to replace the entire battery module 20, thus greatly reducing the maintenance cost of the battery pack and improving the user experience.

[0081] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0083] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0085] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The lower housing (10) includes a bottom plate (12); The battery module (20) includes an end plate (21) and multiple battery cells (22). The multiple battery cells (22) are stacked along a first direction. There are two end plates (21), which are respectively located on both sides of the multiple battery cells (22) in the first direction. The end plates (21) and the multiple battery cells (22) are fixed by straps (23). The battery module (20) is detachably connected to the base plate (12) through the end plates (21).

2. The battery pack according to claim 1, characterized in that, The end plate (21) is snapped into the base plate (12), and / or the end plate (21) is riveted into the base plate (12).

3. The battery pack according to claim 2, characterized in that, One of the end plate (21) and the bottom plate (12) is provided with a buckle (211) and the other is provided with a slot (121). The end plate (21) and the bottom plate (12) are engaged by the buckle (211) and the slot (121).

4. The battery pack according to claim 3, characterized in that, The end plate (21) is provided with the buckle (211), the buckle (211) has a snap-fit ​​part, the bottom plate (12) is provided with the slot (121), and the snap-fit ​​part extends into the slot (121) along the first direction.

5. The battery pack according to claim 4, characterized in that, In the first direction, the latches (211) on the two end plates (21) are arranged facing each other.

6. The battery pack according to claim 4, characterized in that, The end plate (21) is provided with one or more buckles (211). When there are multiple buckles (211), the multiple buckles (211) are arranged at intervals along the second direction. There are multiple slots (121), and the multiple slots (121) are arranged in a one-to-one correspondence with the multiple buckles (211). The second direction intersects with the first direction.

7. The battery pack according to any one of claims 1-6, characterized in that, The lower housing (10) also includes: A frame (11) extends in a ring shape along the circumference of the base plate (12), and the frame (11) and the base plate (12) cooperate to define a receiving cavity (101), wherein the base plate (12) is a first cold plate; The second cold plate (13) extends along a third direction and there are multiple second cold plates (13). The multiple second cold plates (13) are located in the receiving cavity (101) and arranged circumferentially along the battery module (20). The third direction intersects with the first direction.

8. The battery pack according to claim 7, characterized in that, Multiple second cold plates (13) are arranged circumferentially along the battery module (20) and connected end to end. Multiple second cold plates (13) cooperate with the base plate (12) to define a cooling cavity (102). The battery module (20) is disposed in the cooling cavity (102).

9. The battery pack according to claim 8, characterized in that, It also includes a cover (30) which covers the opening of the cooling chamber (102), the cover (30) being detachably connected to a plurality of second cold plates (13), and the cover (30) having a pressure relief hole (301).

10. The battery pack according to claim 7, characterized in that, The frame (11), the base plate (12), and the second cold plate (13) are a single piece.

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