Battery pack and power device

Abstract

The utility model discloses a battery pack and a power plant, the battery pack comprises: a housing, in which an accommodating cavity is defined, the housing comprises a housing body and a cover plate; the battery module is arranged in the accommodating cavity; the cold plate is arranged in the containing cavity and located on the lower side of the battery module, the upper surface of the battery module is connected with the cover plate, and the lower surface of the battery module is connected with the cold plate. According to the battery pack disclosed by the utility model, the upper surface of the battery module is connected with the cover plate, and the lower surface of the battery module is connected with the cold plate, so that the Z-direction size of the battery pack is reduced, the modality and rigidity of the battery pack are improved, and the requirement that the upper cover is not obviously deformed when the battery pack and the whole vehicle are sealed is met; and the requirements of 800V and 4C fast charging are met.

Description

Technical Field

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

[0002] Relevant technologies point out that with the continuous increase in the penetration rate of electric vehicles, China's automobile electrification has entered a new stage. Charging difficulties and long charging time have become the main technical difficulties restricting the development of electric vehicles. In order to reduce the charging time, 800V high voltage and 4C fast charging have become the industry development trend. In 2023, many car companies will plan the development of 800V super charging products.

[0003] As a highly integrated design solution, CTB and CTC can effectively reduce the cost of vehicle development. CTB has become a cost-reduction solution for OEMs.

[0004] Existing conventional power battery packs use a 400V high-voltage architecture and 2.2C fast charging, which cannot further reduce charging time;

[0005] For L2 square shell cells (cell length less than 200mm), since the pole and explosion-proof valve are facing upward, the CTB solution needs to meet the sealing requirements between the upper shell of the battery pack and the vehicle body. However, due to the limited force on the pole and explosion-proof valve, the sealing design requirements cannot be met.

[0006] The L6 battery cell (cell length 500mm-600mm) has a significantly higher internal resistance than the L2 battery cell, which causes the temperature rise of the battery cell during 4C charging and discharging, and places too high requirements on the cooling system design, which cannot meet the 4C fast charging requirements. In addition, the L6 battery cell design uses an 800V high-voltage architecture, and the cell size is too thin, which exceeds the process capability. Utility Model Content

[0007] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack with a simple structure that meets the requirements of 4C fast charging.

[0008] The utility model also provides a power device having the battery pack.

[0009] According to the first aspect of the utility model, the battery pack includes: an outer shell, which defines a accommodating cavity, and the outer shell includes a shell and a cover plate; a battery module, the battery module is arranged in the accommodating cavity; and a cold plate, the cold plate is arranged in the accommodating cavity and is located at the lower side of the battery module, the upper surface of the battery module is connected to the cover plate, and the lower surface of the battery module is connected to the cold plate.

[0010] According to the battery pack of the utility model, the upper surface of the battery module is connected to the cover plate, and the lower surface of the battery module is connected to the cold plate, thereby reducing the size of the battery pack in the Z direction, improving the mode and stiffness of the battery pack, and satisfying the requirement that the upper cover has no obvious deformation when the battery pack and the entire vehicle are sealed. In addition, single-layer cooling is adopted in the battery pack to meet the requirements of 800V and 4C fast charging.

[0011] In some embodiments, the battery module includes at least three battery modules, at least three battery modules are arranged in the Y direction, and each battery module includes a plurality of battery cells arranged in the X direction.

[0012] In some embodiments, a cross beam is formed in the shell, and each of the battery modules is formed with an avoidance portion, the avoidance portion is used to avoid the cross beam, and a longitudinal beam is formed between every two adjacent battery modules.

[0013] In some embodiments, a front-drive positive copper bar is provided on at least one of the plurality of longitudinal beams, and a front-drive negative copper bar and a PACK negative copper bar are provided on another at least one of the plurality of longitudinal beams.

[0014] In some embodiments, the length of the battery cell is in the range of 300 mm-400 mm.

[0015] In some embodiments, the battery pack further includes: a battery energy distribution module and a battery management module, and the battery energy distribution module and the battery management module are both disposed on the cover plate and outside the accommodating cavity.

[0016] In some embodiments, the battery pack further includes: a maintenance cover, which is detachably disposed on the cover plate and covers the battery energy distribution module and the battery management module.

[0017] In some embodiments, the cover plate includes a steel plate and a phase change material plate, and the upper surface of the battery module is bonded to the phase change material plate by a structural adhesive.

[0018] In some embodiments, a cooling channel is formed in the cold plate, a liquid inlet and a liquid outlet are formed on the shell, and the cooling channel is connected and communicated with the liquid inlet and the liquid outlet.

[0019] The power device according to the second aspect of the utility model comprises the battery pack according to the first aspect of the utility model.

[0020] According to the power device of the utility model, by providing the battery pack of the first aspect, the overall performance of the power device is improved, the safety performance of the power device is enhanced, and the possibility of thermal runaway is reduced.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 A schematic top view of a battery pack shown in FIG.

[0024] Figure 3 yes Figure 1 A schematic cross-sectional view of a battery pack shown in ;

[0025] Figure 4 yes Figure 1 A schematic diagram of a housing of a battery pack shown in ;

[0026] Figure 5 yes Figure 1 A schematic diagram of a battery module shown in;

[0027] Figure 6 yes Figure 1 A schematic diagram of the cover plate shown in ;

[0028] Figure 7 yes Figure 1 A partial enlarged schematic diagram of the battery pack shown in FIG.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 1. Shell;

[0032] 11. Shell; 111. Crossbeam; 112. Longitudinal beam; 113. Liquid inlet; 114. Liquid outlet; 115. Side frame; 116. Front drive plug-in; 117. Rear drive plug-in; 118. Fast charge plug-in;

[0033] 12. Cover plate; 121. Threaded column; 122. Steel plate; 123. Phase change material plate;

[0034] 2. Battery module; 21. Structural adhesive; 22. Jumper bus; 23. Avoidance part;

[0035] 3. Cold plate; 31. Thermal conductive structural adhesive;

[0036] 4. Battery energy distribution module; 5. Battery management module;

[0037] 6. Maintenance cover;

[0038] 7. Front drive positive copper bar; 8. Front drive negative copper bar; 9. PACK negative copper bar. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] Reference below Figure 1-Figure 7 A battery pack 100 according to an embodiment of the first aspect of the present invention is described.

[0041] like Figure 1 As shown, the battery pack 100 according to the first embodiment of the utility model includes: a housing 1, a battery module 2 and a cold plate 3.

[0042] Specifically, the housing 1 defines a receiving cavity, the housing 1 includes a shell 11 and a cover plate 12, the battery module 2 is disposed in the receiving cavity, the cold plate 3 is disposed in the receiving cavity and is located at the lower side of the battery module 2, the upper surface of the battery module 2 is connected to the cover plate 12, and the lower surface of the battery module 2 is connected to the cold plate 3. Therefore, the battery pack 100 has a simple structure and an ingenious design, which meets the fast charging needs of the battery pack 100.

[0043] According to the battery pack 100 of the embodiment of the utility model, the upper surface of the battery module 2 is connected to the cover plate 12, and the lower surface of the battery module 2 is connected to the cold plate 3, thereby reducing the size of the battery pack 100 in the Z direction, improving the mode and stiffness of the battery pack 100, and meeting the requirement that the upper cover has no obvious deformation when the battery pack 100 and the entire vehicle are sealed, and single-layer cooling is adopted in the battery pack 100 to meet the requirements of 800V and 4C fast charging.

[0044] In some embodiments of the present invention, the battery module 2 includes at least three battery modules 2, which are arranged in the Y direction, and each battery module 2 includes a plurality of battery cells arranged in the X direction. Figure 1 and Figure 2 As shown, the battery modules 2 include three, which meet the high voltage requirement of the battery pack 100 that the voltage is greater than 800V, and the arrangement is compact, reducing the spatial volume of the battery pack 100.

[0045] In some embodiments of the present invention, a crossbeam 111 is formed in the housing 11, and each battery module 2 is formed with an escape portion 23, the escape portion 23 is used to escape the crossbeam 111, and a longitudinal beam 112 is formed between each two adjacent battery modules 2. Figure 4 and Figure 5As shown, a jumper bus 22 is provided at the position of the avoidance portion 23 to connect the battery cells on both sides of the avoidance portion 23, which simplifies the high-voltage connection of the battery cells on both sides of the crossbeam 111 and reduces the development cost of the battery pack 100. The provision of the crossbeam 111 improves the structural strength of the battery pack 100 and enhances the safety performance of the entire vehicle in the event of a pillar collision.

[0046] In some embodiments of the utility model, a front drive positive copper bar 7 is provided on at least one of the plurality of longitudinal beams 112, and a front drive negative copper bar 8 and a PACK negative copper bar 9 are provided on at least one of the plurality of longitudinal beams 112. Thus, the risk of short circuit caused by compression when the copper bar is arranged between the side frame 115 and the module hits the side column of the whole vehicle is avoided, and the safety performance of the battery pack 100 is improved.

[0047] Preferably, the length of the battery cell is in the range of 300 mm to 400 mm. For example, the length of the battery cell may be 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm, 400 mm, and the like.

[0048] In some embodiments of the present invention, Figure 1 As shown, a convex weld threaded column 121 is provided on the cover plate 12, and the battery pack 100 also includes: a battery energy distribution module 4 and a battery management module 5. The battery energy distribution module 4 and the battery management module 5 are both arranged on the cover plate 12 and located outside the accommodating cavity. The battery energy distribution module 4 and the battery management module 5 are both fixed by fasteners passing through the convex weld threaded column 121. The connection structure is simple, which reduces the difficulty of assembly and facilitates assembly.

[0049] In some embodiments of the utility model, the battery pack 100 also includes: a maintenance cover 6, which is detachably arranged on the cover plate 12 and covers the battery energy distribution module 4 and the battery management module 5. The maintenance cover 6 is fixed by fasteners passing through the convex weld threaded column 121, that is, the threaded column 121 provides a fixing point for the maintenance cover 6. The maintenance cover 6 is provided to facilitate the repair or disassembly of electrical faults.

[0050] In some embodiments of the utility model, the cover plate 12 includes a steel plate 122 and a phase change material plate 123. The upper surface of the battery module 2 is bonded to the phase change material plate 123 by means of a structural adhesive 21. When the sealing strip between the cover plate 12 and the bottom plate of the whole vehicle is compressed, the cover plate 12 is bonded to the battery module 2 by means of the structural adhesive 21. The cover plate 12 can provide sufficient rigidity for the compression of the sealing foam without causing obvious deformation. The cold plate 3 and the battery module 2 are bonded by means of a thermally conductive structural adhesive 3121.

[0051] Since the phase change material has a low thermal conductivity, it can provide the battery pack 100 with better thermal insulation performance, and the high-temperature insulation of the phase change material can ensure that the battery cell and the cover plate 12 do not short-circuit and catch fire when the battery cell thermally runs away, thereby improving the safety performance of the battery pack 100.

[0052] In some embodiments of the present invention, a cooling channel is formed in the cold plate 3, a liquid inlet 113 and a liquid outlet 114 are formed on the shell 11, and the cooling channel is connected and communicated with the liquid inlet 113 and the liquid outlet 114. Thus, the cooling method of the battery pack 100 is simple and the cooling effect is good.

[0053] Furthermore, the battery pack 100 also includes a front drive plug-in 116 , a rear drive plug-in 117 and a fast charging plug-in 118 , all of which are arranged on the shell 11 .

[0054] The power device according to the embodiment of the second aspect of the utility model includes the battery pack 100 according to the embodiment of the first aspect of the utility model.

[0055] According to the power device of the embodiment of the utility model, by providing the battery pack 100 of the first embodiment, the overall performance of the power device is improved, the safety performance of the power device is enhanced, and the possibility of thermal runaway is reduced.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 utility model. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing defines a receiving cavity therein, and the housing includes a shell and a cover plate; A battery module, wherein the battery module is disposed in the accommodating cavity; A cold plate is arranged in the accommodating cavity and located at the lower side of the battery module, the upper surface of the battery module is connected to the cover plate, and the lower surface of the battery module is connected to the cold plate.

2. The battery pack according to claim 1, characterized in that: The battery modules include at least three, the at least three battery modules are arranged in a Y direction, and each of the battery modules includes a plurality of battery cells arranged in an X direction.

3. The battery pack according to claim 2, characterized in that: A crossbeam is formed in the shell, and each battery module is formed with an avoidance portion, the avoidance portion is used to avoid the crossbeam, and a longitudinal beam is formed between every two adjacent battery modules.

4. The battery pack according to claim 3, characterized in that: A front-drive positive copper bar is disposed on at least one of the plurality of longitudinal beams, and a front-drive negative copper bar and a PACK negative copper bar are disposed on another at least one of the plurality of longitudinal beams.

5. The battery pack according to claim 4, characterized in that: The length of the battery cell is in the range of 300 mm to 400 mm.

6. The battery pack according to any one of claims 1 to 5, characterized in that: Also includes: A battery energy distribution module and a battery management module, wherein the battery energy distribution module and the battery management module are both arranged on the cover plate and outside the accommodating cavity.

7. The battery pack according to claim 6, characterized in that: Also includes: A maintenance cover is detachably arranged on the cover plate and covers the battery energy distribution module and the battery management module.

8. The battery pack according to any one of claims 1 to 5, characterized in that: The cover plate includes a steel plate and a phase change material plate, and the upper surface of the battery module is bonded to the phase change material plate by structural adhesive.

9. The battery pack according to any one of claims 1 to 5, characterized in that: A cooling channel is formed in the cold plate, a liquid inlet and a liquid outlet are formed on the shell, and the cooling channel is connected and communicated with the liquid inlet and the liquid outlet.

10. A power device, characterized in that: A battery pack comprising any one of claims 1-9.

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