Battery packs and power devices

Abstract

The present invention relates to a battery pack and an electrical device, comprising: a cold plate; a plurality of battery cells, arranged on one side of the cold plate, and the poles of the battery cells are arranged toward the cold plate; a bus bar, connected to the poles of the battery cells and located between the battery cells and the cold plate; a side of the cold plate facing the bus bar is recessed away from the bus bar to form an avoidance groove, and the bus bar is arranged outside the avoidance groove; an insulating member, arranged between the cold plate and the bus bar; the orthographic projection of the avoidance groove toward the plane where the poles are located covers the welding part where each pole is welded to the bus bar. The avoidance groove has the effect of increasing the distance between the welding part and the cold plate. Since the avoidance groove increases the distance between the welding part and the cold plate, when welding slag and protrusions are generated after the bus bar is welded to the poles of the battery cells, the avoidance groove can avoid the welding slag and protrusions, and the welding slag and protrusions are not easy to pierce the insulating member and contact the cold plate, which can reduce the occurrence of insulation safety problems of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles has gradually increased. For new energy vehicles, power batteries are a key factor in their development.

[0003] In the process of power battery development, the requirements for the insulation safety performance of battery packs have gradually increased. The battery cells and busbars are generally fixed by welding, and the insulating parts are arranged between the busbars and the cold plate. The insulating parts are relatively thin. Due to the influence of the welding process, welding slag and protrusions are easily generated after the busbars and the battery cell poles are welded. The welding slag and protrusions may pierce the insulating parts and contact the cold plate, causing a short circuit, resulting in insulation safety problems for the entire package. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack and an electrical device that can reduce the occurrence of insulation safety problems that are prone to occur in battery packs in traditional technologies.

[0005] In one aspect, the present application provides a battery pack, comprising:

[0006] Cold plate;

[0007] A plurality of battery cells are arranged on one side of the cold plate, and the poles of the battery cells are arranged toward the cold plate;

[0008] A busbar is connected to the pole of the battery cell and is located between the battery cell and the cold plate; a side of the cold plate facing the busbar is recessed away from the busbar to form an avoidance groove, and the busbar is arranged outside the avoidance groove;

[0009] An insulating member, disposed between the cold plate and the busbar;

[0010] The orthographic projection of the avoidance groove toward the plane where the pole is located covers the welding position where each pole is welded to the busbar.

[0011] In one embodiment, the avoidance groove includes a plurality of first sub-grooves, the first sub-grooves are arranged in one-to-one correspondence with the poles, and the orthographic projection of the first sub-grooves toward the corresponding poles covers the welding portion where the poles are welded to the busbars;

[0012] Wherein, the insulating member is arranged outside the first sub-slot.

[0013] In one embodiment, the cross-sectional area of ​​the first sub-groove gradually decreases from an end close to the busbar to an end having a bottom wall;

[0014] The orthographic projection of the bottom wall of the first sub-groove toward the corresponding pole covers a welding position where the pole is welded to the busbar.

[0015] In one embodiment, the battery pack includes a plurality of groups of battery cell groups sequentially arranged along a first direction, each group of the battery cell groups includes a plurality of the battery cells sequentially arranged along a second direction, and each of the battery cells includes two poles arranged along the first direction; the first direction intersects with the second direction;

[0016] The avoidance groove includes a plurality of second sub-grooves, each group of the battery cell groups includes two rows of poles spaced apart along the first direction, and the cold plate is provided with the second sub-grooves arranged along the first direction corresponding to each group of the battery cell groups, and the second sub-grooves respectively correspond to the two rows of poles included in the battery cell groups; each of the second sub-grooves extends along the second direction;

[0017] The orthographic projection of each second sub-slot toward the pole covers a corresponding welding position between the pole and the busbar.

[0018] In one of the embodiments, the battery pack includes a plurality of the insulating members, each of which is embedded in one of the second sub-grooves.

[0019] In one embodiment, the insulating member includes an embedded portion and an overlapped portion that are connected to each other, the embedded portion is embedded in the second sub-groove, and the overlapped portion extends out of the second sub-groove and overlaps the surface of the cold plate facing the busbar.

[0020] In one embodiment, the overlapping portion includes a plurality of overlapping segments arranged at intervals along the second direction; the battery pack further includes a limiting member, the limiting member is arranged between adjacent overlapping segments along the second direction; the limiting member is located between the bus bar and the cold plate;

[0021] and / or

[0022] A blind hole is provided on the bottom wall of the second sub-groove, and a clamping portion is provided on the embedded portion, and the clamping portion is clamped in the blind hole.

[0023] In one of the embodiments, a snap-in groove is provided on the side wall of the blind hole;

[0024] The surface of the clamping portion has a protrusion, and the protrusion is clamped in the clamping groove.

[0025] In one of the embodiments, a side of the cold plate facing the bus bar is covered with an insulation layer.

[0026] On the other hand, the present application also provides an electrical device, comprising the above-mentioned battery pack.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] In the above-mentioned battery pack and electrical device, the insulating part is arranged between the bus and the cold plate, which plays the role of insulating and isolating the bus and the cold plate. On this basis, the side of the cold plate facing the bus is recessed away from the bus to form a avoidance groove, and the bus is arranged outside the avoidance groove, and the orthographic projection of the avoidance groove toward the plane where the pole is located covers the welding part of each pole and the bus, and the avoidance groove plays the role of increasing the distance between the welding part and the cold plate. Because the avoidance groove increases the distance between the welding part and the cold plate, when welding slag and protrusions are generated after the bus and the pole of the battery cell are welded, the avoidance groove can avoid the welding slag and protrusions, and the welding slag and protrusions are not easy to pierce the insulating part and contact the cold plate, which can reduce the occurrence of insulation safety problems of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural diagram of a battery pack provided in one embodiment of the present application;

[0030] Figure 2 for Figure 1 An exploded view of the battery pack shown in;

[0031] Figure 3 for Figure 1 An axonometric view of a portion of the structure of a battery pack shown in ;

[0032] Figure 4 An exploded view of a battery pack provided in another embodiment of the present application;

[0033] Figure 5 for Figure 4 A cross-sectional view of a battery pack shown in ;

[0034] Figure 6 for Figure 4 An exploded view of the battery pack from another perspective shown in FIG.

[0035] Figure 7 for Figure 6 An axonometric view of a portion of the structure of a battery pack shown in ;

[0036] Figure 8 for Figure 1 An exploded view of the battery pack shown in;

[0037] Fig. 9 for Figure 7 A structural diagram of another perspective of the structure shown in;

[0038] Fig.10 for Fig. 9 An enlarged view of the structure shown in C;

[0039] Fig.11 for Figure 1 An exploded view of a portion of the battery pack shown;

[0040] Fig.12 for Fig.11 Assembly diagram of the structure shown in;

[0041] Fig.13 for Figure 1 A cross-sectional view of a battery pack shown in ;

[0042] Fig.14 for Fig.13 A magnified view of the structure shown in FIG.

[0043] Fig.15 for Fig.11 The structure shown in the figure omits a structural diagram of an insulating member;

[0044] Fig.16 for Fig.11 An enlarged view of point B of the structure shown in FIG.

[0045] Description of reference numerals:

[0046] 100, battery pack; 10, cold plate; 11, avoidance groove; 111, first sub-groove; 113, second sub-groove; 1131, blind hole; 20, battery cell; 21, pole; 30, bus bar; 40, insulating member; 41, embedded portion; 42, overlapping portion; 421, overlapping section; 43, clamping portion; 431, raised portion; 50, battery cell group; 60, limit member; 70, heat conductive member; 80, casing. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0048] 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 limiting the present invention.

[0049] 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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 or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0053] See also Figure 1-Figure 3 An embodiment of the present application provides a battery pack 100, including a cold plate 10, a plurality of battery cells 20 and a bus bar 30. The plurality of battery cells 20 are arranged on one side of the cold plate 10, and the poles 21 of the battery cells 20 are arranged toward the cold plate 10. The bus bar 30 is connected to the battery cells 20 and is located between the battery cells 20 and the cold plate 10.

[0054] For more details, see Figure 3 Each battery cell 20 has two poles 21, which are a positive pole and a negative pole. A bus bar 30 connects the positive poles or negative poles of two adjacent battery cells 20. Under the action of the bus bar 30, the two adjacent battery cells 20 are connected in series or in parallel. In some specific embodiments, continue to refer to Figure 1 The battery pack 100 has a plurality of battery cell groups 50 arranged in sequence along a first direction, and each battery cell group 50 includes a plurality of battery cells 20 arranged in sequence along a second direction. Each battery cell group 50 is provided with two rows of busbar groups correspondingly along the first direction, wherein the busbars 30 included in one row of busbar groups connect two adjacent positive poles of the battery cell groups 50, and the busbars 30 included in the other row of busbar groups connect two adjacent negative poles of the battery cell groups 50. The first direction intersects with the second direction. Specifically, the first direction is perpendicular to the second direction. Optionally, the first direction is the length direction of the battery cell 20, and the second direction is the width direction of the battery cell 20, that is, the first direction is Figure 1 The middle X direction, the second direction is Figure 1 Center Y direction.

[0055] It is conceivable that in other embodiments, the number of battery cells 20 included in the battery pack 100 is not limited. For example, the battery pack 100 may also include only one group of battery cell groups 50. In this case, the number of battery cells 20 included in the battery pack 100 is the number of battery cells 20 included in the group of battery cell groups 50. At the same time, the number of bus bars 30 is also not limited, and the number of bus bars 30 changes with the number of battery cells 20.

[0056] See also Figure 4-Figure 6The battery pack 100 further includes a box body 80 , the cold plate 10 is connected to the box body 80 to form a receiving space, the battery cells 20 and the bus bar 30 are both arranged in the receiving space, and the box body 80 plays a role in supporting and protecting components such as the battery cells 20 and the bus bar 30 .

[0057] See also Figure 6 and Figure 7 , one side of the cold plate 10 facing the bus 30 is recessed away from the bus 30 to form an avoidance groove 11, and the bus 30 is arranged outside the avoidance groove 11. The battery pack 100 also includes an insulating member 40, which is made of an insulating material and is arranged between the cold plate 10 and the bus 30. The projection of the avoidance groove 11 toward the plane where the pole 21 is located covers the welding position where each pole 21 is welded to the bus 30. That is, each pole 21 is welded to its corresponding bus 30 to form a welding position, the avoidance groove 11 is opposite to the welding position, and the avoidance groove 11 has an orthographic projection toward the plane where the pole 21 is located, and the welding position is located within the orthographic projection. Specifically, the area of ​​the orthographic projection can be greater than the area of ​​the welding position, or can be equal to the area of ​​the welding position, to ensure that all areas corresponding to the welding position are provided with corresponding avoidance grooves 11.

[0058] Optionally, the battery pack 100 provided in the present application is an inverted structure, and from top to bottom are respectively a battery cell 20, a bus bar 30, an insulating member 40 and a cold plate 10, in which case the cold plate 10 serves as the bottom plate of the battery pack 100. Of course, in some other embodiments, the battery pack 100 may also be arranged in other ways, such as from top to bottom are respectively a cold plate 10, an insulating member 40, a bus bar 30 and a battery cell 20, which is not limited here.

[0059] In the battery pack 100 provided in the embodiment of the present application, the insulating member 40 is disposed between the busbar 30 and the cold plate 10, which plays the role of insulating and isolating the busbar 30 from the cold plate 10. On this basis, the side of the cold plate 10 facing the busbar 30 is recessed away from the busbar 30 to form an avoidance groove 11, the busbar 30 is disposed outside the avoidance groove 11, and the orthographic projection of the avoidance groove 11 toward the plane where the pole 21 is located covers the welding part where each pole 21 is welded to the busbar 30, and the avoidance groove 11 plays the role of increasing the distance between the welding part and the cold plate 10. Since the avoidance groove 11 increases the distance between the welding part and the cold plate 10, when welding slag and protrusions are generated after the busbar 30 is welded to the pole 21 of the battery cell 20, the avoidance groove 11 can avoid the welding slag and protrusions, and the welding slag and protrusions are not easy to pierce the insulating member 40 and contact the cold plate 10, which can reduce the occurrence of insulation safety problems of the battery pack 100.

[0060] In some embodiments, the cold plate 10 includes a first plate and a second plate, the first plate and the second plate are spliced ​​to form the cold plate 10, and the second plate is arranged near the bus 30 relative to the first plate. Among them, the first plate is a flow channel plate, the second plate is a flat plate, and a flow channel groove is provided on the flow channel plate, and the groove wall of the flow channel groove and the flat plate together form a cooling channel for the flow of cooling medium. The bus 30 can exchange heat with the cooling medium in the cooling channel through the flat plate, and the cooling medium in the cooling channel plays the role of cooling the bus 30 and the pole 21 of the battery cell 20. Specifically, the position corresponding to the flat plate and the welding part is recessed to form an avoidance groove 11, and the depth of the avoidance groove 11 is less than the thickness of the flat plate, so as not to affect the normal use of the cold plate 10. For example, in some specific embodiments, the thickness of the flat plate is 1.5 mm, and the depth of the avoidance groove 11 is 0.5 mm. The avoidance groove 11 can be realized by a variety of process methods, such as being formed on the flat plate by milling or stamping.

[0061] It should be understood that in some other embodiments, the cold plate 10 can also be arranged in other ways. For example, the first plate and the second plate can both be set as flow channel plates, and the groove walls of the flow grooves of the two flow channel plates jointly form a cooling flow channel, and the avoidance groove 11 is formed on a flow channel plate facing the bus 30.

[0062] Since the busbar 30 needs to exchange heat with the cold plate 10, the cold plate 10 cools the busbar 30 and the pole 21 of the battery cell 20. In some embodiments, the insulating member 40 has a thermal conductivity, so that the busbar 30 exchanges heat with the cold plate 10 through the insulating member 40. In other specific embodiments, continue to refer to Figure 8 The battery pack 100 may also be provided with a heat conductive member 70, which is disposed between the bus bar 30 and the insulating member 40 or between the insulating member 40 and the cold plate 10, so as to facilitate heat exchange between the cold plate 10 and the bus bar 30, thereby cooling the bus bar 30 and the pole 21 of the battery cell 20. Optionally, the heat conductive member 70 and the insulating member 40 may be integrally formed or separately provided, which is not limited here.

[0063] Optionally, the second plate is a composite plate, the second plate includes a first composite layer and a second composite layer, the first composite layer is arranged closer to the busbar 30 relative to the second composite layer, such as the first composite layer is made of alloys such as stainless steel and low carbon steel, and the second composite layer is made of aluminum and aluminum alloy. Compared with the structure before composite, the second plate after composite is more elastic, has good plasticity, corrosion resistance, oxidation resistance, and has better thermal conductivity, and is easier to meet the requirements of cooling the pole 21, and the composite plate does not affect the welding integration of the first plate and the second plate.

[0064] Further, the side of the cold plate 10 facing the busbar 30 is covered with an insulating layer, specifically, the insulating layer is provided on the side of the second plate facing the busbar 30. Specifically, the surface of the second plate can be sprayed with paint to form an insulating layer, and the thickness can be 80-200 μm. When the welding slag pierces the heat conducting member 70 and / or the insulating member 40 and overlaps the cold plate 10, the insulating layer can reduce the risk of short circuit, improve the insulation effect, and ensure safety performance.

[0065] It should be noted that the insulating spray paint material and thickness can be selected according to actual needs, as long as the insulating protection effect can be achieved, and there is no limitation here.

[0066] The busbar 30 is a composite structure, which is prepared by a composite process (such as semi-solid continuous casting and rolling, hot-dip continuous casting and rolling, cold rolling, etc.). Specifically, the busbar 30 includes a third composite layer and a fourth composite layer, the third composite layer is located on the side of the pole 21 away from the battery cell 20, and the fourth composite layer is arranged close to the pole 21 of the battery cell 20. The third composite layer can be prepared by alloys such as stainless steel and low carbon steel, and the fourth composite layer can be prepared by aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys. Compared with the single-layer busbar 30, the busbar 30 of the composite structure has a higher overall strength and is not easy to deform during welding. The busbar 30 of the composite structure is more elastic, has a higher circulation rate, is more corrosion-resistant, more resistant to oxidation, has good plasticity, and has good thermal conductivity, and is easier to exchange heat with the cold plate 10 to cool the pole 21.

[0067] In some embodiments, see Figure 7 , the avoidance groove 11 includes a plurality of first sub-grooves 111, the first sub-grooves 111 are arranged one-to-one with the poles 21, and the orthographic projection of the first sub-grooves 111 toward the corresponding pole 21 covers the welding part where the pole 21 is welded with the busbar 30. Among them, the insulating member 40 is arranged outside the first sub-groove 111. For example, in some specific embodiments, when the battery pack 100 has a plurality of groups of battery cell groups 50 distributed along the first direction, and each group of battery cell groups 50 includes a plurality of battery cells 20 distributed along the second direction, the battery pack 100 has a plurality of first sub-groove groups, the number of the first sub-groove groups is equal to the number of the busbar groups and is arranged accordingly, which is twice the number of the battery cell groups 50, and each group of the first sub-groove groups includes a plurality of first sub-grooves 111 distributed along the second direction, and the number is equal to the number of the battery cells 20 included in each group of battery cell groups 50. In some other specific embodiments, when the battery cells 20 of the battery pack 100 are arranged in other ways, the arrangement of the first sub-grooves 111 will also change accordingly.

[0068] With the above arrangement, since each pole 21 is provided with a corresponding first sub-groove 111 and the insulating member 40 is arranged outside the first sub-groove 111, even if welding slag and protrusions are generated after welding the bus 30 and the pole 21 of the battery cell 20 and pierce the insulating member 40, the welding slag and protrusions will first extend into the first sub-groove 111 and will not directly contact the cold plate 10, thereby ensuring the insulation safety performance of the battery pack 100.

[0069] It should be noted that the insulating member 40 may be an integrated structure, and the integrated insulating member 40 is sandwiched between the busbar 30 and the cold plate 10. Alternatively, the battery pack 100 may also include a plurality of separately arranged insulating members 40, specifically, each insulating member 40 is arranged corresponding to a group of busbar groups, and each insulating member 40 is arranged between the busbar group and the cold plate 10. It is also possible to arrange each insulating member 40 corresponding to a group of battery cell groups 50, and each insulating member 40 is sandwiched between two groups of busbar groups corresponding to the group of battery cell groups 50 and the cold plate 10, which is also not limited here.

[0070] For further information, see Fig. 9 and Fig.10 The cross-sectional area of ​​the first sub-groove 111 gradually decreases from the end close to the busbar 30 to the end with the bottom wall, and the orthographic projection of the bottom wall of the first sub-groove 111 toward the corresponding pole 21 covers the welding part where the pole 21 and the busbar 30 are welded. That is, the first sub-groove 111 adopts a structural design of being wide at the top and narrow at the bottom, so that the first sub-groove 111 absorbs more margin, preventing welding slag and protrusions from contacting the cold plate 10 when there is a deviation in the welding between the busbar 30 and the pole 21, and further reducing the occurrence of insulation safety problems of the battery pack 100.

[0071] In some other embodiments, continue to refer to Figure 1 The battery pack 100 has a plurality of battery cell groups 50 arranged in sequence along the first direction, each battery cell group 50 includes a plurality of battery cells 20 arranged in sequence along the second direction, each battery cell 20 includes two poles 21 arranged in the first direction, and each row of battery cell groups 50 includes two rows of poles 21 arranged at intervals in the first direction. Fig.11 The cold plate 10 is provided with two second sub-grooves 113 corresponding to each group of battery cells 50, and the two second sub-grooves 113 correspond to two rows of poles 21 respectively. The orthographic projection of each second sub-groove 113 toward the pole 21 covers the welding position where the corresponding row of poles 21 is welded to the busbar 30. The size of the second sub-groove 113 in the first direction and the second direction is smaller than the size of the cold plate 10.

[0072] In the above arrangement, each row of poles 21 is provided with a corresponding second sub-groove 113, and the insulating member 40 can be selectively arranged outside the second sub-groove 113 or inside the second sub-groove 113. When welding slag and protrusions are generated after the bus 30 and the poles 21 of the battery cell 20 are welded, the welding slag and the protrusions will first extend into the second sub-groove 113, and will not directly contact the cold plate 10, thereby ensuring the insulation safety performance of the battery pack 100.

[0073] For further information, see Fig.11 and Fig.12 , the battery pack 100 has a plurality of insulating members 40, and each insulating member 40 is embedded in a second sub-groove 113. On the one hand, the second sub-groove 113 provides a placement space for the insulating member 40, and the insulating member 40 is embedded in the second sub-groove 113, which is convenient for fixing the insulating member 40; on the other hand, the insulating member 40 is arranged in the second sub-groove 113, so that the bus 30 can be arranged closer to the cold plate 10 relative to the method of placing the insulating member 40 outside the second sub-groove 113, and the size of the battery pack 100 in the third direction can be reduced. The first direction, the second direction and the third direction intersect with each other. Specifically, the first direction, the second direction and the third direction are perpendicular to each other. Optionally, the third direction is the height direction of the battery cell 20. The third direction is Figure 1 Middle Z direction.

[0074] See also Fig.13 and Fig.14 The insulating member 40 includes an embedding portion 41 and an overlapping portion 42 connected to each other. The embedding portion 41 is embedded in the second sub-groove 113, and the overlapping portion 42 extends out of the second sub-groove 113 and overlaps the surface of the cold plate 10 facing the busbar 30. When the cold plate 10 includes a flow channel plate and a flat plate, the second sub-groove 113 is opened on the flat plate, and the depth of the second sub-groove 113 is less than or equal to half the thickness of the flat plate, and the overlapping portion 42 overlaps the surface of the flat plate facing away from the flow channel plate. Part of the insulating member 40 is installed in the second sub-groove 113, and part of it overlaps on the flat plate, so that the insulating member 40 is stably fixed in the second sub-groove 113.

[0075] See also Fig.15 and Fig.16 , a blind hole 1131 is provided on the bottom wall of the second sub-groove 113, and a clamping portion 43 is provided on the embedded portion 41, and the clamping portion 43 is clamped in the blind hole 1131. The blind hole 1131 provides a fixed position for the insulating member 40, and the clamping portion 43 is clamped in the blind hole 1131 to position and limit the insulating member 40. The depth of the blind hole 1131 shall be such that it does not affect the normal use of the cold plate 10. For example, in some specific embodiments, the thickness of the flat plate is 1.5 mm, the depth of the second sub-groove 113 is 0.5 mm, and the depth of the blind hole 1131 is 0.5 mm. It should be understood that in some other embodiments, the sizes of the flat plate, the second sub-groove 113 and the blind hole 1131 are not limited.

[0076] Optionally, the position of the embedded portion 41 where the clamping portion 43 is not provided can be bonded to the bottom wall of the second sub-groove 113 by glue to ensure the fixing effect of the insulating member 40 in the second sub-groove 113 .

[0077] Further reading Fig.14 , a clamping groove is provided on the side wall of the blind hole 1131, and a protrusion 431 is provided on the surface of the clamping portion 43, and the protrusion 431 is clamped in the clamping groove. Specifically, the clamping portion 43 is a columnar structure, and the protrusion 431 is convexly provided on the outer peripheral surface of the clamping portion 43, so as to be clamped in the clamping groove. In this way, when the clamping portion 43 is clamped in the blind hole 1131, the protrusion 431 is clamped in the clamping groove, and the protrusion 431 cooperates with the clamping groove to limit the clamping portion 43 from being pulled out of the blind hole 1131, further ensuring the fixing effect of the insulating member 40 in the second sub-groove 113.

[0078] Further reading Fig.16 , the lap joint 42 includes a plurality of lap joint sections 421 arranged at intervals along the second direction, and the battery pack 100 also includes a limiter 60, and the limiter 60 is arranged between adjacent lap joint sections 421 along the second direction. Among them, the limiter 60 is located between the bus 30 and the cold plate 10 in the third direction. The lap joint 42 adopts a segmented design, which can reduce the warping of the lap joint 42 compared to the whole design of the lap joint 42, and facilitates the fitting of each lap joint section 421 with the cold plate 10, thereby ensuring the fitting effect between the lap joint section 421 and the surface of the cold plate 10. At the same time, the limiter 60 is located between the bus 30 and the cold plate 10 in the third direction, and can limit the upper CCS components (including the bus 30) and the like to prevent insulation failure caused by excessive extrusion.

[0079] Optionally, the limiting member 60 is made of compressed foam. It should be understood that in other embodiments, the material of the limiting member 60 is not limited, as long as it can play a limiting role.

[0080] Another embodiment of the present application further provides an electric device, comprising the above-mentioned battery pack 100. Since the above-mentioned battery pack 100 has beneficial effects, accordingly, the electric device comprising the above-mentioned battery pack 100 has the same beneficial effects, which will not be described in detail here.

[0081] Optionally, the electrical device is a vehicle, which may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0082] It is worth noting that, for pure electric vehicles, the above-mentioned battery pack 100 can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0083] In other embodiments, there is no limitation on the types of electrical devices, such as electrical devices may also be ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment may be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment may be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: Cold plate (10); A plurality of battery cells (20) are arranged on one side of the cold plate (10), and the poles (21) of the battery cells (20) are arranged toward the cold plate (10); A busbar (30) is connected to the pole (21) of the battery cell (20) and is located between the battery cell (20) and the cold plate (10); a side of the cold plate (10) facing the busbar (30) is recessed away from the busbar (30) to form an avoidance groove (11), and the busbar (30) is arranged outside the avoidance groove (11); An insulating member (40) is disposed between the cold plate (10) and the bus bar (30); The orthographic projection of the avoidance groove (11) toward the plane where the pole (21) is located covers the welding position where each pole (21) is welded to the busbar (30).

2. The battery pack according to claim 1, characterized in that: The avoidance groove (11) comprises a plurality of first sub-grooves (111), the first sub-grooves (111) being arranged in one-to-one correspondence with the poles (21), and the orthographic projection of the first sub-grooves (111) toward the corresponding pole (21) covers the welding position where the pole (21) and the busbar (30) are welded; Wherein, the insulating member (40) is arranged outside the first sub-slot (111).

3. The battery pack according to claim 2, characterized in that: The cross-sectional area of ​​the first sub-groove (111) gradually decreases from an end close to the busbar (30) to an end having a bottom wall; The orthographic projection of the bottom wall of the first sub-groove (111) toward the corresponding pole (21) covers the welding position between the pole (21) and the busbar (30).

4. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of battery cell groups (50) arranged in sequence along a first direction, each of the battery cell groups (50) comprises a plurality of battery cells (20) arranged in sequence along a second direction, and each of the battery cells (20) comprises two poles (21) arranged along the first direction; the first direction intersects with the second direction; The avoidance groove (11) comprises a plurality of second sub-grooves (113), each group of the battery cell groups (50) comprises two rows of poles (21) arranged at intervals along the first direction, and the cold plate (10) is provided with the second sub-grooves (113) arranged along the first direction corresponding to each group of the battery cell groups (50), and the second sub-grooves (113) respectively correspond to the two rows of poles (21) included in the battery cell groups (50); each second sub-groove (113) extends along the second direction; The orthographic projection of each second sub-slot (113) toward the pole (21) covers the welding position between the corresponding pole (21) and the busbar (30).

5. The battery pack according to claim 4, characterized in that: The battery pack comprises a plurality of insulating members (40), each of the insulating members (40) being embedded in one of the second sub-grooves (113).

6. The battery pack according to claim 5, characterized in that: The insulating member (40) comprises an embedded portion (41) and an overlap portion (42) which are connected to each other, wherein the embedded portion (41) is embedded in the second sub-slot (113), and the overlap portion (42) extends out of the second sub-slot (113) and overlaps the surface of the cold plate (10) facing the busbar (30).

7. The battery pack according to claim 6, characterized in that: The overlapping portion (42) includes a plurality of overlapping sections (421) arranged at intervals along the second direction; the battery pack also includes a limiting member (60), the limiting member (60) being arranged between adjacent overlapping sections (421) along the second direction; the limiting member (60) is located between the bus bar (30) and the cold plate (10); and / or A blind hole (1131) is provided on the bottom wall of the second sub-groove (113), and a clamping portion (43) is provided on the embedded portion (41), and the clamping portion (43) is clamped in the blind hole (1131).

8. The battery pack according to claim 7, characterized in that: A clamping groove is provided on the side wall of the blind hole (1131); The surface of the clamping portion (43) has a protrusion (431), and the protrusion (431) is clamped in the clamping groove.

9. The battery pack according to claim 1, characterized in that: A side of the cold plate (10) facing the busbar (30) is covered with an insulation layer.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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