Battery pack and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack and an electric device. The battery pack comprises a box body, a cold plate and a battery cell assembly, and the box body is provided with an accommodating space; the battery cell assembly is located in the accommodating space, the battery cell assembly comprises a plurality of battery cells, the plurality of battery cells are regularly arranged in a horizontal plane at equal intervals, and the battery cell assembly is filled with a pouring sealant; the cold plate is attached to the upper side and / or the lower side of the battery cell assembly and the pouring sealant. According to the battery pack, the cold plates are arranged on the upper side and / or the lower side of the battery cell assembly, so that a snake-shaped plate arranged between the battery cells in the horizontal plane is omitted, more space can be provided for accommodating the battery cells in the horizontal plane, and the energy density of the battery pack is improved; besides, the plurality of battery cells are arranged at equal intervals, after the pouring sealant is poured, the heat conduction consistency of each battery cell to the pouring sealant is good, and the cold plate is in contact with the colloid of the pouring sealant, so that the heat dissipation uniformity of the battery cell assembly is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and an electrical device. Background Art

[0002] The volume utilization efficiency of a cylindrical battery system has an inherent disadvantage compared with that of a square battery system. Currently, serpentine tubes or extruded profile pipelines are used as cooling pipelines between multiple cylindrical battery cells. Therefore, the serpentine tubes occupy a large space in the plane direction, reducing the volume utilization efficiency of the cylindrical battery system. Moreover, the number of components in the pipeline of the serpentine tube battery system is large, and the component cost is high. In addition, the heat dissipation uniformity of multiple battery cells in the battery pack is poor.

[0003] Therefore, there is an urgent need to design a battery pack and an electrical device to solve the above problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a battery pack, which can improve the energy density of the battery pack, streamline the structure and improve the integration degree of the battery pack.

[0005] Another object of the utility model is to provide an electrical device, which has longer battery life, fewer parts and faster assembly by adopting the above battery pack.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The battery pack includes:

[0008] A box body, which is provided with an accommodation space;

[0009] A battery cell assembly, which is located in the accommodation space. The battery cell assembly includes a plurality of battery cells. The plurality of battery cells are regularly arranged and equidistantly arranged in a horizontal plane. The battery cell assembly is filled with potting glue;

[0010] A cold plate, which is attached to the upper side and / or the lower side of the battery cell assembly and the potting glue.

[0011] As an optional solution, the distance between two adjacent battery cells is L, and 0.5 mm < L ≤ 10 mm.

[0012] As an optional solution, the cold plate is attached to the lower side of the battery cell assembly and the potting glue. The battery pack further includes an integrated component. The integrated component includes a bracket and the cold plate that are sequentially stacked on the bottom side of the box body. The cold plate and the bracket are fixedly connected as a whole.

[0013] As an optional solution, the potting glue includes a bottom glue and a gap glue, the bottom glue is located between the battery cell assembly and the integrated assembly, and the gap glue is located on the top of the bottom glue and filled inside the battery cell assembly or between the battery cell assembly and the box, wherein:

[0014] The bottom layer glue is thermally conductive glue, and the gap glue is foam glue; or

[0015] The above-mentioned bottom glue and the above-mentioned gap glue are both foam glue; or

[0016] The above-mentioned bottom layer glue and the above-mentioned gap glue are both thermally conductive glue.

[0017] As an optional solution, the cold plate and the bracket are connected by brazing or riveting.

[0018] As an optional solution, the integrated component further includes a foam layer, and the foam layer is filled between the bracket and the cold plate.

[0019] As an optional solution, the integrated component further includes an insulating layer, and the insulating layer covers between the battery cell component and the integrated component.

[0020] As an optional solution, the bracket and the cold plate are both provided with a plurality of via holes, the via holes on the bracket and the via holes on the cold plate are arranged in one-to-one correspondence, and the battery cells are placed above the via holes in one-to-one correspondence.

[0021] As an optional solution, a pressure relief space is formed between the integrated component and the bottom plate of the box, the via hole is connected to the pressure relief space, and the pressure relief space is connected to the outside of the box.

[0022] As an optional solution, the height of the pressure relief space is H, 1mm≤H≤50mm.

[0023] As an optional solution, the above cold plate includes:

[0024] A support plate, on which the battery cell assembly is placed;

[0025] A flow channel plate is fixedly connected to the support plate, a flow channel for liquid flow is formed in the flow channel plate, and the bracket is located on a side of the flow channel plate away from the support plate;

[0026] The water inlet pipe and the water outlet pipe are both installed on the support plate and are respectively connected to the two ends of the flow channel.

[0027] As an optional solution, the battery cells are columnar, and a plurality of the battery cells are arranged in multiple rows, and the battery cells in each adjacent row are staggered.

[0028] The electrical device includes the above-mentioned battery pack.

[0029] The beneficial effects of the present utility model are as follows:

[0030] The present utility model provides a battery pack. By arranging the cold plate on the upper side and / or the lower side of the battery cell assembly, the serpentine plate arranged between the battery cells in the horizontal plane is omitted, so that there is more space in the horizontal plane to accommodate the battery cells, improving the energy density of the battery pack. Similarly, the liquid cooling structure related to the serpentine plate can be omitted together, simplifying the layout of the liquid cooling structure and saving space. In addition, due to the equal-spacing arrangement of multiple battery cells, after potting glue is filled, the heat conduction of each battery cell to the potting glue is consistent. The cold plate contacts the colloid of the potting glue, improving the uniformity of heat dissipation of the battery cell assembly.

[0031] The present utility model also provides an electrical device, which includes the above-mentioned battery pack. By adopting the above-mentioned battery pack, the electrical device has a longer battery life, fewer parts, and faster assembly. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the battery pack provided by an embodiment of the present utility model;

[0033] Figure 2 is an exploded view of the battery pack provided by an embodiment of the present utility model with the battery cell assembly hidden;

[0034] Figure 3 is a schematic structural diagram of the battery pack provided by an embodiment of the present utility model with the battery cell assembly hidden;

[0035] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0036] Figure 5 is Figure 4 an enlarged view of B in

[0037] In the figure:

[0038] 10. Box body; 11. Side wall; 12. Bottom plate; 20. Integrated component; 21. Bracket;

[0039] 22. Cold plate; 221. Support plate; 222. Flow channel plate; 223. Water inlet pipe; 224. Water outlet pipe;

[0040] 23. Foaming glue layer; 24. Insulation layer; 30. Battery cell assembly; 31. Battery cell; 40. Pressure relief space. Detailed Embodiments

[0041] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0045] The present utility model provides a battery pack, which can improve the energy density of the battery pack, streamline the structure, and improve the integration of the battery pack. As Figure 1 and Figure 2As shown in the figure, the battery pack includes a box body 10, a cold plate 22, and a battery cell assembly 30. The box body 10 is provided with an accommodation space. The battery cell assembly 30 is located within the accommodation space. The battery cell assembly 30 includes a plurality of battery cells 31. The plurality of battery cells 31 are regularly arranged and equally spaced in a horizontal plane. The battery cell assembly is filled with potting glue. The cold plate 22 is attached to the upper side and / or the lower side of the battery cell assembly 30 and the potting glue. In the above battery pack, by arranging the cold plate on the upper side and / or the lower side of the battery cell assembly, the serpentine plate arranged between the battery cells 31 in the horizontal plane is omitted, so that there is more space in the horizontal plane to accommodate the battery cells 31, improving the energy density of the battery pack. Similarly, the liquid cooling structure related to the serpentine plate can be omitted together, simplifying the layout of the liquid cooling structure and saving space. In addition, due to the equal spacing of the plurality of battery cells 31, after potting, the heat conduction from each battery cell 31 to the potting glue is good. The cold plate 22 is in contact with the colloid of the potting glue, improving the uniformity of heat dissipation of the battery cell assembly 30.

[0046] Optionally, the battery cell 31 is columnar, and the plurality of battery cells 31 are arranged in multiple rows, and adjacent rows of battery cells 31 are arranged in a staggered manner. With such an arrangement, for the columnar battery cells 31, it is relatively convenient to achieve an equal-spacing design between adjacent battery cells 31. In other embodiments, the battery cell 31 can also be rectangular or polygonal.

[0047] Optionally, the cold plate 22 is attached to the lower side of the battery cell assembly 30 and the potting glue. The battery pack further includes an integrated assembly 20. The integrated assembly 20 includes a bracket 21 and the above-mentioned cold plate 22 that are sequentially stacked on the bottom side of the box body 10. The cold plate 22 and the bracket 21 are fixedly connected as a whole. The battery cell assembly 30 is located above the integrated assembly 20. It can be understood that the cold plate 22 is above the bracket 21, and the cold plate 22 is in direct contact with the lower side of the battery cell 31, and the heat exchange effect is better. At the same time, the cold plate 22 and the bracket 21 are fixedly connected as a whole, and the cold plate 22 also plays a role in supporting the battery cell assembly 30 together with the bracket 21. On the one hand, it prevents the cold plate 22 from being damaged, and on the other hand, the support strength is higher.

[0048] In other embodiments, the cold plate 22 can also be arranged above the battery cell assembly 30, which is not limited herein.

[0049] Optionally, the cold plate 22 and the bracket 21 are connected by brazing or riveting. Brazing has small deformation, and the welding position is smooth and beautiful, which is beneficial to ensuring the shape stability of the cold plate 22 and the bracket 21. The riveting connection method is more rapid.

[0050] Optionally, the integral part formed by the cold plate 22 and the bracket 21 is also connected to the box body 10 by brazing or riveting.

[0051] Optionally, as Figure 2As shown, the integrated component 20 further includes a foaming adhesive layer 23, and the foaming adhesive layer 23 is filled between the bracket 21 and the cold plate 22. The foaming adhesive layer 23 can further enhance the support strength of the integrated component 20 for the battery cell component 30, meeting the multi-working condition and complex application requirements of the battery pack. For example, when the battery pack is subjected to external impact, the foaming adhesive layer 23 can play a good buffering role to prevent the cold plate 22 or the bracket 21 from breaking or deforming.

[0052] Optionally, a plurality of through holes are provided in both the bracket 21 and the cold plate 22, and the through holes on the bracket 21 and the through holes on the cold plate 22 are arranged in one-to-one correspondence. The battery cells 31 are placed above the through holes in one-to-one correspondence. On the one hand, the through holes play a certain positioning role for the battery cells 31. On the other hand, the arrangement of the through holes can achieve stable pressure relief during thermal runaway of the battery cells 31, and through further cooling by the liquid cooling system, the temperature generated by thermal runaway can be further reduced, reducing the risk of system thermal diffusion.

[0053] Furthermore, as Figure 2 shown, the integrated component 20 further includes an insulating layer 24, and the insulating layer 24 covers between the battery cell component 30 and the integrated component 20. It can be understood that when the battery cell 31 is not failed, the insulating layer 24 covers the through holes, which can not only insulate but also ensure the sealing performance, and can also ensure that when the battery cell 31 fails, the impact force of the failure of the battery cell 31 can break through the insulating layer 24 to complete pressure relief. Among them, the insulating layer 24 can be attached to the top of the liquid cooling plate 22, or can be stacked with the liquid cooling plate 22 by hot pressing, which is not limited herein.

[0054] It should be noted that the filling thickness of the foaming adhesive layer 23 is only a few millimeters, and the impact force of the failure of the battery cell 31 can also break through the foaming adhesive layer 23 to achieve pressure relief.

[0055] Optionally, as Figure 1 shown, potting glue (not shown in the figure) is provided in the box body 10 located at the upper part of the integrated component 20. The above setting is beneficial to the fixation of the battery cells 31 and can also improve the temperature consistency between the battery cell components 30.

[0056] Among them, the potting glue includes a bottom layer glue and an interstitial glue. The bottom layer glue is located between the battery cell component 30 and the integrated component 20 (i.e., the cold plate 22), and the interstitial glue is located above the bottom layer glue and is filled inside the battery cell component 30 or between the battery cell component 30 and the box body 10.

[0057] In an optional embodiment, the bottom layer glue is a thermally conductive glue, and the interstitial glue is a foaming glue. The above setting improves the heat conduction speed between the battery cell 31 and the cold plate 22. While the foaming glue fixes the battery cell 31, it prevents the failure of one battery cell 31 from being transmitted to another battery cell 31.

[0058] In an alternative embodiment, both the bottom glue and the gap glue are foaming glues. With this arrangement, the overall structural strength of the battery pack is more uniform, and the impact resistance is better.

[0059] In an alternative embodiment, both the bottom glue and the gap glue are thermally conductive glues. With this arrangement, the temperature equalization performance of the multiple battery cells 31 is the best.

[0060] Optionally, the gaps between adjacent vias are consistent, that is to say, the gaps between the battery cells 31 and the battery cells 31 are kept consistent. The distance between two adjacent battery cells 31 is L, where 0.5 mm < L ≤ 10 mm. The gap is set to reserve a 0.5 mm gap to meet the assembly requirements, meet the requirements of the thermal safety of the battery pack, and can make the best use of the accommodation space inside the battery pack. It can be understood that in the prior art, the arrangement of the serpentine tube cannot ensure that the gaps between the battery cells 31 are equal. In this embodiment, on the premise of omitting the serpentine tube, the gaps between the battery cells 31 and the battery cells 31 are set to be equal, which can simplify the design difficulty of the internal parts of the battery pack, increase the matching of the battery system, and the equal-spacing design can improve the consistency of the glue filling between the battery cells 31, and further improve the temperature equalization performance of the battery cell assembly 30.

[0061] Optionally, as Figures 3 - 5 shown, a pressure relief space 40 is formed between the integrated component 20 and the bottom plate 12 of the box body 10. The via is communicated with the pressure relief space 40, and the pressure relief space 40 is communicated with the outside of the box body 10. Through the above arrangement, when the battery cell 31 fails, the gas can quickly enter the pressure relief space 40 from the via and then rush out of the box body 10 to achieve rapid pressure relief, preventing the gas from accumulating and exploding inside the battery pack. Optionally, the height of the pressure relief space 40 is between 1 mm and 50 mm, and it can be flexibly adjusted based on the pressure relief and bottom protection requirements. Among them, a pressure relief channel can be opened on the side wall 11 of the box body 10 to communicate the pressure relief space 40 with the outside of the box body 10. This structure is commonly set in the prior art and will not be elaborated here.

[0062] Optionally, as Figure 2 shown, the cold plate 22 includes a support plate 221, a flow channel plate 222, a water inlet pipe 223, and a water outlet pipe 224. The battery cell assembly 30 is placed on the support plate 221; the flow channel plate 222 is fixedly connected to the support plate 221, and a flow channel for liquid to flow is formed in the flow channel plate 222. The bracket 21 is located on the side of the flow channel plate 222 away from the support plate 221; the water inlet pipe 223 and the water outlet pipe 224 are both installed on the support plate 221 and are respectively communicated with both ends of the flow channel. Through the above arrangement, the cooling liquid enters from the water inlet pipe 223, flows through the flow channel formed in the flow channel plate 222, exchanges heat with the battery cell assembly 30, and then flows out from the water outlet pipe 224 for circulating heat exchange. Among them, the support plate 221 and the flow channel plate 222 are connected by brazing, which can minimize the deformation of the cold plate 22.

[0063] Among them, the insulating layer 24 is located on the upper layer of the support plate 221, and the foaming adhesive layer 23 is located between the flow channel plate 222 and the bracket 21.

[0064] This embodiment also provides an electrical device, which includes the above battery pack. By adopting the above battery pack, the electrical device has a longer battery life, fewer parts, and faster assembly. Exemplarily, the electrical device can be a new energy vehicle or a ship, etc., which is not limited herein.

[0065] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: The box body (10) is provided with a receiving space; A battery cell assembly (30) is located in the accommodating space, the battery cell assembly (30) comprises a plurality of battery cells (31), the plurality of battery cells (31) are regularly arranged in a horizontal plane and are arranged at equal intervals, and the battery cell assembly is filled with potting glue; A cold plate (22) is attached to the battery cell assembly (30) and the upper side and / or the lower side of the potting glue.

2. The battery pack according to claim 1, characterized in that: The distance between two adjacent battery cells (31) is L, 0.5 mm < L ≤ 10 mm.

3. The battery pack according to claim 1, characterized in that: The cold plate (22) is arranged in contact with the battery cell assembly (30) and the lower side of the potting glue. The battery pack also includes an integrated assembly (20). The integrated assembly (20) includes a bracket (21) and the cold plate (22) which are sequentially stacked on the bottom side of the box body (10). The cold plate (22) and the bracket (21) are fixedly connected as a whole.

4. The battery pack according to claim 3, characterized in that: The potting glue comprises a bottom glue and a gap glue, the bottom glue is located between the battery cell assembly (30) and the integrated assembly (20), and the gap glue is located on the top of the bottom glue and filled inside the battery cell assembly (30) or between the battery cell assembly (30) and the box (10), wherein: The bottom glue is a thermally conductive glue, and the gap glue is a foam glue; or The bottom glue and the gap glue are both foam glue; or The bottom layer glue and the gap glue are both thermally conductive glue.

5. The battery pack according to claim 3, characterized in that: The cold plate (22) and the bracket (21) are connected by brazing or riveting.

6. The battery pack according to claim 3, characterized in that: The integrated component (20) further comprises a foamed rubber layer (23), wherein the foamed rubber layer (23) is filled between the bracket (21) and the cold plate (22).

7. The battery pack according to claim 3, characterized in that: The integrated component (20) further comprises an insulating layer (24), wherein the insulating layer (24) covers between the battery cell component (30) and the integrated component (20).

8. The battery pack according to claim 3, characterized in that: The bracket (21) and the cold plate (22) are both provided with a plurality of via holes, the via holes on the bracket (21) and the via holes on the cold plate (22) are arranged in a one-to-one correspondence, and the battery cells (31) are placed above the via holes in a one-to-one correspondence.

9. The battery pack according to claim 8, characterized in that: A pressure relief space (40) is formed between the integrated component (20) and the bottom plate (12) of the box body (10), the through hole is in communication with the pressure relief space (40), and the pressure relief space (40) is in communication with the outside of the box body (10).

10. The battery pack according to claim 9, characterized in that: The height of the pressure relief space is H, 1mm≤H≤50mm.

11. The battery pack according to any one of claims 3 to 8, characterized in that: The cold plate (22) comprises: A support plate (221), the battery cell assembly (30) being placed on the support plate (221); A flow channel plate (222) is fixedly connected to the support plate (221), a flow channel for liquid flow is formed in the flow channel plate (222), and the bracket (21) is located on a side of the flow channel plate (222) away from the support plate (221); The water inlet pipe (223) and the water outlet pipe (224) are both installed on the support plate (221) and are respectively connected to the two ends of the flow channel.

12. The battery pack according to any one of claims 1 to 10, characterized in that: The battery core (31) is columnar, and a plurality of the battery cores (31) are arranged in a plurality of rows, with the battery cores (31) in each adjacent row being staggered.

13. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-12.

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