Battery pack

Abstract

The utility model relates to a battery pack which comprises a shell and a battery module, cooling liquid is arranged in the shell, the battery module is immersed in the cooling liquid of the shell, the battery module comprises a plurality of battery cell groups and a clamping plate group, the battery cell groups are arranged at intervals, the clamping plate group is arranged among the battery cell groups, and the clamping plate group is arranged between the battery cell groups. A first flow guide structure is arranged on the side surface of the clamping plate group, the first flow guide structure penetrates through the clamping plate group along a first direction, a cavity is formed between the battery module and the inner wall of the shell, and two ends of the first flow guide structure are communicated with the cavity and are used for enabling cooling liquid to flow in the cavity and the first flow guide structure. The cooling liquid uniformly flows among the battery cell groups through the first flow guide structures, so that each battery cell group can be fully cooled, the temperature difference among the battery cell groups is reduced, the formation of local hot spots is reduced, the temperature consistency of the whole battery pack is improved, and the cooling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage battery technical field, especially a battery pack. BACKGROUND

[0002] In the battery energy storage technology, improving the battery energy storage density is an important development direction, with the increase of the battery energy storage density, the heat generated in the battery working process also rises. Effective heat management is crucial to ensure the safety of the battery and prolong its service life.

[0003] The traditional liquid cooling method is to flow the cooling liquid through the bottom or side of the battery pack to take away the heat. Although this method is effective, it gradually shows that it is not up to the task when facing high energy storage density batteries. Especially in some designs, due to unreasonable cooling channel layout or insufficient cooling liquid flow, etc., it may cause local "hot spots" in the battery pack, that is, the temperature of some areas is too high, and the existence of these hot spots will exacerbate battery aging and increase the risk of thermal runaway.

[0004] In order to solve this problem and provide heat dissipation efficiency and reduce the temperature difference of single battery, some high energy storage density battery packs begin to use immersion liquid cooling method to cool the battery pack. SUMMARY

[0005] The utility model provides a battery pack for solving the technical problems of large battery temperature difference and local "hot spots" in the battery pack in the prior art.

[0006] The utility model provides a battery pack, comprising:

[0007] A shell is provided with a cooling liquid inside;

[0008] A battery module is immersed in the cooling liquid in the shell, the battery module comprises a cell group and a clamping plate group, the cell group is arranged in multiple intervals, the clamping plate group is arranged between the cell groups, the clamping plate group is provided with a first flow guide structure on the side, the first flow guide structure penetrates the clamping plate group along the first direction, a cavity is arranged between the battery module and the inner wall of the shell, both ends of the first flow guide structure are communicated with the cavity, and the cooling liquid flows in the cavity and the first flow guide structure.

[0009] In one embodiment, the first flow guide structure covers the entire side of the clamping plate group, and the first flow guide structure is at least one through hole.

[0010] In one embodiment, the battery pack further comprises at least one side plate, the side plate is installed inside the shell, the side plate is arranged close to the side of the battery module, the cavity is located in the space range surrounded by the side plate and the inner wall of the shell, a plurality of second flow guide structures are arranged along the length direction of the side plate, the second flow guide structures are arranged along the second direction, and the projection of the second flow guide structures on the side plate coincides with the clamp plate group.

[0011] In one embodiment, the second flow guide structure is a long strip-shaped flow guide groove, or the second flow guide structure is a plurality of flow guide holes arranged along the second direction.

[0012] In one embodiment, the side plate is arranged in a bent mode corresponding to the side edge of the upper end of the battery module, the bent part of the upper end of the side plate is fixedly connected with the side wall of the shell, and the lower end of the side plate is fixedly connected with the bottom surface of the shell.

[0013] In one embodiment, the two side surfaces of the battery module adjacent to the cavity are provided with cross beams and end plates, the end plates are installed on the cross beams and arranged close to the side surface of the battery module, and the outer side of the end plate and the battery module is locked by a binding belt.

[0014] In one embodiment, the side plate is arranged close to the battery module, the side plate is provided with a groove corresponding to the position of the binding belt, and the binding belt is arranged in the groove.

[0015] In one embodiment, the bottom surface of the battery module is provided with a plurality of limiting strips along the first direction, and the limiting strips are arranged at the middle position of the bottom surface of each battery cell group.

[0016] In one embodiment, the shell comprises a cover and a box body, the cover is installed on the port of the box body, and a sealing gasket is arranged between the cover and the port of the box body.

[0017] The side surface of the box body is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are installed on the same side surface of the box body, and the liquid inlet and the liquid outlet are in communication with the cavity inside the shell.

[0018] In one embodiment, the clamp plate group is arranged in a whole clamp plate or a plurality of clamp plates spliced.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] 1. Through the cavity arranged between the side of the battery module perpendicular to the clamp plate group and the inner wall of the shell, and the first flow guide structure arranged through the side of the clamp plate group, the cooling liquid flows in from the liquid inlet side, sequentially passes through the cavity of the liquid inlet side, the first flow guide structure, the cavity of the liquid outlet side, and finally flows out from the liquid outlet side, forming a circulation path, the cooling liquid flows uniformly between the cell groups through the first flow guide structure, ensuring that each cell group can be fully cooled, thereby reducing the temperature difference between the cell groups, reducing the formation of local hot spots, improving the temperature consistency of the entire battery pack, improving the cooling efficiency, helping to prolong the battery life, and improving the reliability of the overall system;

[0021] The clamp plate group can also fix the cell group, strengthen the overall structure of the battery module, and reduce the influence of vibration or collision on the cell group during vehicle driving, and the side plate can also play a certain supporting role to prevent the shell from deforming and pressing the internal battery module;

[0022] 2. The binding belt fastens the battery module in the shell, which can significantly reduce the displacement of the battery module during vehicle driving, thereby avoiding damage to the cell group caused by vibration or collision, and the binding belt cooperates with the groove on the side plate to shorten the distance between the side plate and the battery module, which can ensure that the second flow guide structure on the side plate is aligned with the side of the clamp plate group, and then the second flow guide structure and the first flow guide structure can accurately communicate, further optimizing the flow path of the cooling liquid;

[0023] 3. By arranging a limiting strip at the middle position of the bottom surface of the cell group, the limiting strip plays a supporting and isolating role on the cell group, which can ensure that the load is evenly distributed on the cell group, prevent local stress from being too large to cause deformation or damage of the cell group, and make the battery module and the bottom surface of the box form multiple parallel flow channels in the transverse direction, so that the cooling liquid flowing into the lower battery module flows in the multiple parallel flow channels and flows to the other side surface of the box, improving the heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] In the following, the utility model will be described in more detail based on the embodiments and with reference to the drawings.

[0025] Figure 1 is a battery pack external structure schematic diagram of the utility model;

[0026] Figure 2 is a front view cross section schematic diagram of the battery pack;

[0027] Figure 3 is a battery module left view of the utility model;

[0028] Figure 4 is one of the side plate structure schematic diagram of the utility model;

[0029] Figure 5 is the second side plate structure schematic diagram of the utility model;

[0030] Figure 6 is the cooperation structure schematic diagram of the battery cell group and the clamping plate group in the utility model;

[0031] Figure 7 is the multiple form structure schematic diagram of the clamping plate group in the utility model;

[0032] Figure 8 is several structure schematic diagrams of the first flow guide structure in the utility model.

[0033] Reference signs:

[0034] 1, upper cover; 2, box body; 3, liquid inlet; 4, liquid outlet; 5, side plate; 51, cavity; 52, second flow guide structure; 53, groove; 6, sealing gasket; 7, battery module; 71, battery cell group; 72, crossbeam; 73, end plate; 74, bandage; 8, clamping plate group; 9, first flow guide structure; 10, limiting strip. DETAILED DESCRIPTION

[0035] The utility model will be further described below in combination with the drawings.

[0036] The first direction in the application is the length direction of the clamping plate group, that is, the long side direction of the normal placement state of the battery cell group, such as Figure 6 The direction indicated by arrow A in the figure; the second direction is the width direction of the side plate, that is, the vertical direction of the normal placement state of the battery cell group, such as Figure 6 The direction indicated by arrow B in the figure; the upper end surface of the normal placement state of the battery module is the top surface, the lower end surface is the bottom surface, and the circumferential surface is the side surface.

[0037] As shown in Figures 1-8 The utility model provides a kind of battery pack, including one inside full of cooling liquid shell, battery module 7 is immersed in the cooling liquid in shell and is arranged;Battery module 7 includes battery cell group 71 and clamping plate group 8, battery cell group 71 is arranged with multiple intervals, clamping plate group 8 is arranged between battery cell group 71, wherein clamping plate group 8 side is provided with first flow guide structure 9, first flow guide structure 9 is through clamping plate group 8 along first direction A, cavity 51 is arranged between the side surface of battery module 7 and shell inner wall, specifically, cavity 51 is located at the side surface of battery module 7 corresponding to the two ends of first flow guide structure 9, both ends of first flow guide structure 9 are communicated with cavity 51, for making cooling liquid flow in cavity 51 and first flow guide structure 9;

[0038] As shown in Figure 2 、 Figure 7 The side surface of battery module 7 corresponding to the two ends of first flow guide structure 9 is divided into liquid inlet side and liquid outlet side, cooling liquid flows in from liquid inlet side, passes through cavity 51 of liquid inlet side, first flow guide structure 9, cavity 51 of liquid outlet side in turn, and finally flows out from liquid outlet side, to form circulation path.

[0039] Through the cavity 51 arranged between the side of the battery module 7 perpendicular to the clamp plate group 8 and the inner wall of the shell, and the first flow guide structure 9 arranged through the side of the clamp plate group 8, the cooling liquid flows in from the liquid inlet side, sequentially passes through the cavity on the liquid inlet side, the first flow guide structure, the cavity on the liquid outlet side, and finally flows out from the liquid outlet side, forming a circulation path. The cooling liquid flows uniformly between the cell groups 71 through the first flow guide structure 9, ensuring that each cell group 71 can be fully cooled, thereby reducing the temperature difference between the cell groups 71, reducing the formation of local hot spots, improving the temperature consistency of the entire battery pack, improving the cooling efficiency, helping to prolong the battery life, and improving the reliability of the overall system.

[0040] The clamp plate group 8 can also support and isolate the cell groups 71, strengthening the overall structure of the battery module 7 and reducing the impact of vibration or collision on the cell groups 71 during vehicle driving.

[0041] As shown in Figure 8 , regarding the specific arrangement of the first flow guide structure 9, in this embodiment, the first flow guide structure 9 covers the entire side of the clamp plate group 8. Specifically, the first flow guide structure 9 is at least one through hole, which can be arranged as one through hole covering the entire side of the clamp plate group 8, or two or more through holes covering the entire side of the clamp plate group 8. The through hole can be circular, square, triangular, rhombic, etc., and the purpose is to make the cooling liquid flow through the first flow guide structure 9, so that the cooling liquid fully contacts the side wall of the cell group 71.

[0042] Specifically, the cell group 71 can be a whole cell or a plurality of cells spliced together.

[0043] The clamp plate group 8 can be arranged as one clamp plate or a plurality of clamp plates spliced together.

[0044] When arranged as one clamp plate covering the side of the cell group 71, the clamp plate can be more simply and quickly installed between the cell groups 71, and the whole clamp plate can transfer temperature, which is conducive to maintaining the temperature uniformity between the cell groups 71, reducing the generation of local hot spots, and providing higher strength to better resist external impact or internal pressure changes, reducing the possibility of deformation, and also providing better electrical isolation effect to reduce the risk of short circuit.

[0045] When the clamping plates cover the side surface of the battery cell group 71, the size and shape of each part can be adjusted as needed to adapt to different battery layouts or specific design requirements. If a clamping plate is damaged, it can be replaced individually without replacing the entire clamping plate set, reducing maintenance costs and time. Multiple clamping plates can be optimized for specific application scenarios, such as adding heat-conducting materials or changing material thickness in certain areas to improve heat dissipation efficiency. The operation is more flexible, and gaps or channels can be designed between the spliced clamping plates to help form better cooling liquid flow paths, thereby improving overall heat dissipation effect.

[0046] Preferably, as shown in Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 The battery pack also includes at least one side plate 5 installed inside the housing. The side plate 5 is arranged near the side surface of the battery module 7. The side plate 5 covers the ports of the first flow guide structure 9, and the cavity 51 is defined within the space formed by the side plate 5 and the inner wall of the housing. Multiple sets of second flow guide structures 52 are provided on the side plate 5. The second flow guide structures 52 are arranged in the second direction B. The second flow guide structures 52 coincide with the projection of the clamping plate set 8 on the side plate 5. The second flow guide structures 52 are aligned with the side surface of the clamping plate set 8 in the first direction. The second flow guide structures 52 are in communication with the first flow guide structure 9, allowing the cooling liquid to flow into the first flow guide structure 9 through the second flow guide structures 52. The second flow guide structures 52 can be long strip-shaped flow guide grooves, or multiple flow guide holes arranged in the second direction.

[0047] Regarding the specific arrangement of the side plate 5, the side plate 5 is arranged perpendicular to the clamping plate set 8. More preferably, the side plate 5 is two plates arranged on both sides of the battery module 7, or the side plate 5 is one plate arranged on the liquid inlet side of the battery module 7. Less preferably, the side plate 5 is one plate arranged on the liquid outlet side of the battery module 7.

[0048] The side plate 5 limits the cooling liquid in the cavity 51, allowing the cooling liquid in the cavity 51 to flow into the first flow guide structure 9 only through the second flow guide structures 52. The cooling liquid can uniformly flow into the first flow guide structure 9 through the second flow guide structures 52. The side plate 5 can also provide support to prevent the housing from deforming and pressing the internal battery module 7.

[0049] In addition, as shown in Figure 4As shown, in order to enhance the overall structural stability of the battery module 7, the side plate 5 is bent at the side edge corresponding to the upper end of the battery module 7, and the bent portion of the upper end of the side plate 5 is fixedly connected with the side wall of the shell, while the lower end of the side plate 5 is fixedly connected with the bottom surface of the shell. In this embodiment, the side plate 5 is connected with the shell by welding, but of course the lower end of the side plate 5 can also be connected with the bottom surface of the shell by clamping slot clamping, and the bent portion of the upper end of the side plate 5 is welded with the side wall of the shell. This design not only provides lateral support to prevent the battery module 7 from shifting when subjected to lateral force, but also enhances the rigidity of the entire battery pack through the fixed connection of the upper and lower ends, reduces the structural deformation caused by vibration or collision during vehicle driving, and at the same time, the bent portion of the upper end of the side plate 5 can also block the cooling liquid to a certain extent, limiting the cooling liquid to flow more in the cavity 51, so that it can only flow out and flow in through the second flow guide structure 52, and most of the cooling liquid will flow through the flow channel between the first flow guide structure 9 and the limiting strip 10, so that the cooling liquid can uniformly flow through each cell group 71, improving the heat dissipation efficiency. This fixed mode of the side plate 5 not only improves the structural stability of the battery module 7, but also supports the bent portion of the upper end of the side plate 5 on the side wall of the box 2, facilitating installation, and also ensures the consistency and reliability of the internal components of the battery pack, thereby improving the overall performance and service life of the battery pack.

[0050] Preferably, referring to Figure 3 , the two side surfaces of the battery module 7 adjacent to the cavity 51 are provided with a cross beam 72 and an end plate 73, the end plate 73 is installed on the cross beam 72 and is arranged in close contact with the side surface of the battery module 7, and the end plate 73 and the cross beam 72 can be welded or bolted, and the outer side of the end plate 73 and the battery module 7 is locked by a steel band 74, which is selected as a steel band in this embodiment. The steel band is provided with two upper and lower steel bands to lock and fix the battery module 7, and the steel band 74 fastens the battery module 7 between the two end plates 73 to ensure the stability of the battery module 7 and reduce displacement caused by vibration or collision, and the end plate 73 protects the steel band 74 from damaging the battery module 7.

[0051] Further, as shown in Figure 3 , Figure 5 , the side plate 5 is arranged close to the battery module 7 and is provided with a recess 53 at a position corresponding to the steel band 74, and the steel band 74 is arranged in the recess 53. The steel band 74 cooperates with the recess 53 on the side plate 5 to make the battery module 7 more stable, shorten the distance between the side plate 5 and the battery module 7, and ensure that the second flow guide structure 52 on the side plate 5 is accurately aligned with the first flow guide structure 9 on the clamping plate group 8, further optimizing the flow path of the cooling liquid, enhancing the structural stability of the battery module 7, and ensuring that each cell group 71 is uniformly cooled, thereby improving the overall performance and service life of the battery pack.

[0052] AsFigure 3 As shown, in order to further improve the structural stability and heat dissipation effect of the battery module 7, the bottom surface of the battery module 7 is provided with a plurality of limiting strips 10 along the first direction, and specifically, the limiting strips 10 are correspondingly arranged at the middle position of the bottom surface of each cell group 71. The design of the limiting strips 10 not only effectively limits the movement of the cell group 71 in the horizontal direction, ensures the fixed position of the cell group 71 in the battery module 7, but also ensures the uniform distribution of the load on the cell group 71 by providing support at the middle position of the bottom surface of the cell group 71, preventing the cell group 71 from deforming or being damaged due to excessive local stress. At the same time, the limiting strips 10 also make the battery module 7 and the bottom surface of the box 2 form a plurality of transverse parallel flow channels, the cooling liquid in the cavity 51 flows into the plurality of parallel flow channels between the limiting strips 10 through the second flow guide structure 52 on the liquid inlet side of the battery module 7, and flows to the liquid outlet side of the battery module 7, increasing the contact area of the cooling liquid with the battery module 7 and improving the heat dissipation effect, thereby improving the overall performance and service life of the battery pack.

[0053] Preferably, as shown in the drawings, Figure 1 As shown, the shell includes an upper cover 1 and a box 2, the upper cover 1 is installed on the port of the box 2, and a sealing gasket 6 is arranged between the upper cover 1 and the port of the box 2 to ensure that the cooling liquid inside the shell does not leak, and at the same time prevent external moisture and dust from entering the inside of the shell, thereby improving the waterproof and dustproof performance of the battery pack.

[0054] Further, the box 2 is provided with a liquid inlet 3 and a liquid outlet 4 on the side surface, and the liquid inlet 3 and the liquid outlet 4 are both in communication with the cavity 51, so that the cooling liquid can enter from the cavity 51 on the liquid inlet side, pass through the flow channel between the first flow guide structure 9 and the limiting strip 10, and enter the cavity 51 on the liquid outlet side to circulate.

[0055] Further, the liquid inlet 3 and the liquid outlet 4 are installed on the same side surface of the box 2, and the two interfaces are located in the lower half of the cavity 51, which is beneficial to the rapid and stable flow of the cooling liquid in the cavity 51, ensures that the cooling liquid can uniformly flow through each cell group 71, improves the heat dissipation efficiency, and facilitates the maintenance and repair of the cooling system.

[0056] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: a shell, which is internally provided with a cooling liquid; a battery module, which is immersed in the cooling liquid in the shell, and comprises a plurality of groups of electric cores arranged at intervals and a plurality of groups of clamping plates arranged between the groups of electric cores, each group of clamping plates being provided with a first flow guide structure on a side surface thereof, the first flow guide structure penetrating through the group of clamping plates in a first direction, and a cavity being arranged between the battery module and an inner wall of the shell, both ends of the first flow guide structure being in communication with the cavity, so as to make the cooling liquid flow in the cavity and the first flow guide structure.

2. The battery pack of claim 1, wherein, The first flow guide structure covers the entire side surface of the group of clamping plates, and the first flow guide structure is at least one through hole.

3. The battery pack of claim 1, wherein, The battery pack further comprises at least one side plate, which is installed in the shell, arranged close to a side surface of the battery module, and located in a space range formed by the side plate and the inner wall of the shell, and a plurality of groups of second flow guide structures are arranged along a length direction of the side plate, the second flow guide structures being arranged in a second direction, and a projection of the second flow guide structures on the side plate coinciding with the group of clamping plates.

4. The battery pack of claim 3, wherein, The second flow guide structure is a long strip-shaped flow guide groove, or the second flow guide structure is a plurality of flow guide holes arranged in the second direction.

5. The battery pack of claim 3, wherein, The side plate is arranged in a bent manner corresponding to a side edge of an upper end of the battery module, the bent upper end of the side plate is fixedly connected to a side wall of the shell, and a lower end of the side plate is fixedly connected to a bottom surface of the shell.

6. The battery pack of claim 3, wherein, Both side surfaces of the battery module adjacent to the cavity are provided with a cross beam and an end plate, the end plate is installed on the cross beam and arranged close to a side surface of the battery module, and an outer side of the end plate and the battery module is locked by a binding belt.

7. The battery pack of claim 6, wherein, The side plate is arranged close to the battery module, and a groove is arranged in the side plate corresponding to a position of the binding belt, and the binding belt is arranged in the groove.

8. The battery pack of claim 1, wherein, A bottom surface of the battery module is provided with a plurality of limiting strips arranged in the first direction, and the limiting strips are arranged at a middle position of a bottom surface of each group of electric cores.

9. The battery pack of claim 1, wherein, The shell comprises a cover and a box body, the cover is installed on a port of the box body, and a sealing gasket is arranged between the cover and the port of the box body; The box body is provided with an inlet and an outlet, the inlet and the outlet are installed on the same side surface of the box body, and the inlet and the outlet are in communication with the cavity in the shell.

10. The battery pack of claim 1, wherein, The group of clamping plates is arranged in one whole clamping plate or a plurality of clamping plates.

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