Battery device

Abstract

The utility model relates to the technical field of batteries, and provides a battery device which comprises a battery unit, a busbar and an insulating part, the battery unit comprises a plurality of batteries, each battery comprises a battery shell and a pole, the pole is arranged on the battery shell and protrudes out of the outer surface of the battery shell, and the insulating part is arranged on the battery shell. The battery shell and the pole respectively form electrode output ends of the battery, and the polarity of the battery shell is opposite to that of the pole; the busbar is located on the side, provided with the pole, of the battery and comprises a first connecting part and a second connecting part, the first connecting part is electrically connected with the pole of at least part of the battery, and the second connecting part is electrically connected with the battery shell of at least part of the other battery; the insulator is located between the busbar and the battery case, and the insulator covers at least part of the structures of the plurality of batteries in the battery unit. The structural stability between the busbar and the battery in the battery device is relatively good.

Description

Technical Field

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

[0002] In the related art, the battery device includes multiple batteries and a busbar, the battery shell and the pole serve as two electrode output terminals of the battery respectively, the busbar is arranged on the same side of the multiple batteries, and the busbar can respectively connect the poles of some batteries and the battery shells of other batteries.

[0003] When a car equipped with the battery device is driving, multiple batteries may be relatively displaced in the height direction, resulting in disconnection between the batteries and the busbars.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The utility model provides a battery device, which can improve the technical problem of easy connection failure between a bus bar and a battery.

[0006] The battery unit includes:

[0007] A battery unit, wherein the battery unit comprises a plurality of batteries, wherein the battery comprises a battery housing and a pole, wherein the pole is disposed on the battery housing and protrudes from the outer surface of the battery housing, wherein the battery housing and the pole respectively form electrode output ends of the battery, and wherein the polarities of the battery housing and the pole are opposite;

[0008] A busbar, located on a side of the battery provided with a pole, the busbar comprising a first connection portion and a second connection portion, the first connection portion being electrically connected to the pole of at least part of the battery, and the second connection portion being electrically connected to the battery casing of at least another part of the battery;

[0009] The insulating member is located between the bus bar and the battery housing, and covers at least a portion of the structure of the plurality of batteries in the battery unit.

[0010] The utility model adds an insulating member between the bus and the battery housing, and the insulating member covers at least a portion of the structure of the multiple batteries. The insulating member can limit the multiple batteries, thereby reducing the relative displacement between the multiple batteries, and further reducing the risk of failure of the connection between the bus and the battery.

[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0013] in:

[0014] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a battery device disclosed in the present invention;

[0015] Figure 2 for Figure 1 An enlarged view of a local area AA in the battery device shown;

[0016] Figure 3 A top view of an exemplary embodiment of a battery device disclosed herein;

[0017] Figure 4 for Figure 3 An enlarged view of a local area BB in the battery device shown;

[0018] Figure 5 It is a partial structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0019] Figure 6 A top view of a partial structure of an exemplary embodiment of a battery device disclosed herein;

[0020] Figure 7 It is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed in the present invention;

[0021] Figure 8 for Figure 4 The battery device is shown in a partial cross-sectional view along the dashed line CC.

[0022] Description of reference numerals:

[0023] 1. Battery cell; 11. Battery; 111. Battery housing; 112. Post; 11x. Battery row; 2. Bus; 21. First connection portion; 22. Second connection portion; 3. Insulator; 31. First insulating portion; 32. Second insulating portion; 41. First through hole; 42. Second through hole; 5. Gap; 6. Battery case; X, third direction; Y, second direction; Z, first direction. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0025] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0026] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0027] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0028] like Figure 1-7 As shown, Figure 1 is a schematic structural diagram of an exemplary embodiment of a battery device disclosed herein. Figure 2 for Figure 1 An enlarged view of a local area AA in the battery device shown, Figure 3 is a top view of an exemplary embodiment of a battery device disclosed herein, Figure 4 for Figure 3 An enlarged view of a local area BB in the battery device shown, Figure 5 It is a partial structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention. Figure 6 is a top view of a partial structure of an exemplary embodiment of a battery device disclosed herein, Figure 7It is a schematic diagram of the structure of a battery in an exemplary embodiment of the battery device disclosed in the present invention.

[0029] The battery device includes: a battery cell 1, a busbar 2, and an insulating member 3. The battery cell 1 includes a plurality of batteries 11. The battery 11 includes a battery shell 111 and a pole 112. The pole 112 is arranged on the battery shell 111, and the pole 112 protrudes from the outer surface of the battery shell 111. The battery shell 111 and the pole 112 respectively form electrode output ends of the battery 11, and the polarities of the battery shell 111 and the pole 112 are opposite; the busbar 2 is located on a side of the battery 11 where the pole 112 is provided. The busbar includes a first connecting portion 21 and a second connecting portion 22. The first connecting portion 21 is electrically connected to the pole 112 of at least some of the batteries 11, and the second connecting portion 22 is electrically connected to the battery shell 111 of at least another part of the batteries 11; the insulating member 3 is located between the busbar and the battery shell 111, and the insulating member 3 covers at least part of the structure of the plurality of batteries 11 in the battery cell 1.

[0030] In this exemplary embodiment, an insulating member 3 is additionally provided between the bus 2 and the battery housing 111. The insulating member 3 covers at least a portion of the structure of the plurality of batteries 11. The insulating member 3 can limit the plurality of batteries 11, thereby reducing the relative displacement between the plurality of batteries 11, and further reducing the risk of disconnection between the bus 2 and the battery 11.

[0031] In this exemplary embodiment, the multiple batteries in the battery unit 1 can be distributed in an array along the third direction X and the second direction Y, and the third direction X and the second direction Y are parallel to the bottom plate of the battery box. The insulating member 3 can be a large structure, and the insulating member 3 can cover at least part of the structure of all batteries in the battery unit 1. Multiple batteries in the same battery unit are connected in parallel or in series.

[0032] In this exemplary embodiment, Figure 1-7As shown, the pole 112 is located on one side of the battery housing 111 in the first direction Z, and the ratio of the thickness of the insulating member 3 in the first direction Z to the thickness of the busbar 2 in the first direction Z is 1 / 15-5. For example, the ratio of the thickness of the insulating member 3 in the first direction Z to the thickness of the busbar 2 in the first direction Z can be equal to 1 / 15, 1 / 13, 1 / 11, 1 / 9, 1 / 7, 1 / 5, 1 / 3, 1 / 2, 1, 3 / 2, 2, 5 / 2, 3, 7 / 2, 4, 9 / 2, 5, etc. The ratio of the thickness of the insulating member 3 in the first direction Z to the thickness of the bus 2 in the first direction Z is too small, the thickness of the insulating member 3 in the first direction Z is too small, or the thickness of the bus 2 in the first direction Z is too large. When the thickness of the insulating member 3 in the first direction Z is too small, the insulating member 3 cannot effectively press the battery 11, and the movement of the battery 11 in the first direction Z is still likely to cause the battery and the bus 2 to be disconnected. When the thickness of the bus 2 in the first direction Z is too large, the bus 2 will increase the overall weight of the battery device, which is not conducive to the lightweight design of the battery device; the ratio of the thickness of the insulating member 3 in the first direction Z to the thickness of the bus 2 in the first direction Z is too large, the thickness of the insulating member 3 in the first direction Z is too large, or the thickness of the bus 2 in the first direction Z is too small. When the thickness of the insulating member 3 in the first direction Z is too large, the bus 2 will seriously protrude from the battery housing 111, which is not conducive to the connection between the bus 2 and the battery housing 111. When the thickness of the bus 2 in the first direction Z is too small, the bus 2 is prone to breakage. This exemplary embodiment sets the ratio of the thickness of the insulating part 3 in the first direction Z to the thickness of the bus 2 in the first direction Z to an appropriate size. This setting can reduce the risk of disconnection between the battery 11 and the bus 2, while also reducing the overall weight of the battery device. In addition, this setting can also facilitate the connection between the bus 2 and the battery housing 111, and reduce the risk of the bus 2 breaking.

[0033] In this exemplary embodiment, Figure 1-7 As shown, a first through hole 41 is formed on the insulating member 3, and the pole 112 can be arranged through the first through hole 41. This arrangement can enable the busbar 2 to be electrically connected to the pole 112 normally.

[0034] In this exemplary embodiment, Figure 1-7As shown, the minimum distance between the inner edge of the first through hole 41 and the outer edge of the pole 112 is 0.1mm-2mm. For example, the minimum distance between the inner edge of the first through hole 41 and the outer edge of the pole 112 can be equal to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. The minimum distance between the inner edge of the first through hole 41 and the outer edge of the pole 112 is too small, and the pole 112 is not easy to pass through the first through hole 41; the minimum distance between the inner edge of the first through hole 41 and the outer edge of the pole 112 is too large, the area where the insulating member 3 presses the battery 11 is small, and the limiting effect of the insulating member 3 on the battery movement is weak, and there is still a risk of disconnection between the battery 11 and the bus 2. In this exemplary embodiment, the minimum distance between the inner edge of the first through hole 41 and the outer edge of the pole 112 is set to an appropriate size, which can not only facilitate the pole 112 to pass through the first through hole 41, but also reduce the risk of disconnection between the battery 11 and the bus 2.

[0035] In this exemplary embodiment, Figure 1-7 As shown, the first through hole 41 is a combination of a rectangle and a semicircle, and the first through hole 41 of this shape can facilitate the pole 112 to be disposed therein. It should be understood that in other exemplary embodiments, the first through hole 41 can also be other structures, for example, the first through hole 41 can also be a circle, a polygon, an irregular shape, etc.

[0036] In this exemplary embodiment, Figure 1-7As shown, the pole 112 is located on one side of the battery housing 111 in the first direction Z, and the ratio of the thickness of the insulating member 3 in the first direction Z to the size of the pole 112 in the first direction Z is 1 / 10-1. The ratio of the thickness of the insulating member 3 in the first direction Z to the size of the pole 112 in the first direction can be equal to 1 / 10, 2 / 10, 3 / 10, 4 / 10, 5 / 10, 6 / 10, 7 / 10, 8 / 10, 9 / 10, 1, etc. The ratio of the thickness of the insulating member 3 in the first direction to the size of the pole 112 in the first direction is too small, and the thickness of the insulating member 3 in the first direction Z is too small, so the insulating member 3 cannot effectively press the battery 11, and the movement of the battery 11 in the first direction Z still easily causes the battery and the bus 2 to be disconnected; the ratio of the thickness of the insulating member 3 in the first direction to the size of the pole 112 in the first direction is too large, and the thickness of the insulating member 3 in the first direction Z is too large, and the bus 2 will seriously protrude from the battery housing 111, which is not conducive to the connection between the bus 2 and the battery housing 111. In this exemplary embodiment, the ratio of the thickness of the insulating member 3 in the first direction to the size of the pole 112 in the first direction is set to a suitable size, which can reduce the risk of disconnection between the battery 11 and the bus 2, and can also facilitate the connection between the bus 2 and the battery housing 111.

[0037] In addition, the thickness of the insulating member in the first direction does not exceed the size of the pole in the first direction. If the thickness of the insulating member in the first direction exceeds the size of the pole in the first direction, the insulating member will lift the entire second connection portion connected to the battery housing in the busbar, thereby making it difficult to weld the second connection portion and the battery housing. The ratio of the thickness of the insulating member 3 in the first direction Z to the size of the pole 112 in the first direction Z can preferably be 0.3-0.8. For example, the ratio of the thickness of the insulating member 3 in the first direction Z to the size of the pole 112 in the first direction Z can be equal to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0038] In this exemplary embodiment, Figure 8 As shown, Figure 4The battery device shown is a partial cross-sectional view along the dotted line CC. The pole 112 is located on one side of the battery housing 111 in the first direction Z; the insulating member 3 includes a first insulating portion 31 and a second insulating portion 32, the projection of the first insulating portion 31 in the first direction overlaps with the projection of the busbar in the first direction, and the projection of the second insulating portion 32 in the first direction does not overlap with the projection of the busbar in the first direction; the thickness of the second insulating portion 32 in the first direction is greater than the thickness of the first insulating portion 31 in the first direction. This arrangement can press the battery 11 with the thicker second insulating portion 32, thereby reducing the risk of the battery 11 moving in the first direction Z; at the same time, this arrangement sets the first insulating portion 31 to be thinner, thereby reducing the size of the busbar 2 protruding in the first direction Z, and thus facilitating the connection between the busbar 2 and the battery housing 111.

[0039] In this exemplary embodiment, the busbar 2 can be welded to the battery housing 111 and the pole 112. It should be understood that in other exemplary embodiments, the busbar 2 can also be connected to the battery housing 111 and the pole 112 through a conductive structure such as a conductive adhesive.

[0040] In this exemplary embodiment, Figure 1-7 As shown, the battery unit 1 may include a plurality of battery rows 11x distributed along the second direction Y, and the battery row 11x includes a plurality of batteries 11 distributed along the third direction X, and the second direction Y and the third direction X intersect; the batteries 11 in the adjacent battery rows 11x in the second direction Y are staggered in sequence in the third direction X, and at least some of the batteries 11 are adjacent to two batteries 11 in the adjacent battery row 11x and form a gap 5; a second through hole 42 is formed on the insulating member 3, and the second through hole 42 and the gap 5 are arranged oppositely, that is, the projection of the second through hole 42 in the first direction Z and the projection of the gap 5 in the first direction Z at least partially overlap. This arrangement can facilitate the subsequent injection of glue into the gap 5 through the second through hole 42. Figure 1-7 As shown, the gap 5 is triangular-shaped, and accordingly, the second through hole 42 may also be triangular-shaped. It should be understood that in other exemplary embodiments, the second through hole 42 may also be circular, polygonal, irregular, etc.

[0041] In this exemplary embodiment, Figure 1-7 As shown, some of the second through holes 42 can be independently provided, and some of the second through holes 42 can be connected to the first through holes 41 .

[0042] In this exemplary embodiment, Figure 1-7As shown, the pole 112 is located on one side of the battery housing 111 in the first direction Z, the projection area of ​​the insulating member 3 in the first direction Z is S1, the outer contour area of ​​the side wall of the battery 11 provided with the pole 112 is S2, and S1 / S2 is 1 / 2-3 / 4. For example, S1 / S2 can be equal to 1 / 2, 5 / 8, 3 / 4, etc. If S1 / S2 is too small, S1 is too small, the pressing effect of the insulating member 3 on the battery 11 is not obvious, and the battery still has the risk of moving in the first direction Z; if S1 / S2 is too large, S1 is too large, the battery area exposed outside the insulating member 3 is too small, the area that the bus 2 and the battery housing can be connected is too small, and the current capacity of the bus 2 is weak. In this exemplary embodiment, S1 / S2 is set to a suitable size, which can not only ensure the current area of ​​the bus 2, but also reduce the risk of the battery 11 moving in the first direction Z.

[0043] In this exemplary embodiment, Figure 1-7 As shown, the battery device may further include: a battery case 6, a battery 11 is located in the battery case 6, an insulating member 3 may be fixed to the battery case 6, and the insulating member 3 fixed to the battery case 6 may effectively press the battery 11 to prevent the battery 11 from moving in the first direction Z. The insulating member may include a transition portion, such as an L-shaped transition portion, which is connected to the bottom wall of the battery case or the box beam. It should be understood that in other exemplary embodiments, the insulating member 3 may also be fixed to the battery 11 covered thereby. The insulating member 3 may connect multiple batteries into a whole, thereby reducing the risk of some batteries moving in the first direction Z.

[0044] In this exemplary embodiment, Figure 1-7 As shown, the battery 11 may be a cylindrical battery. The busbar 2 may be connected to the end surface of the battery 11 where the pole 112 is provided.

[0045] In this exemplary embodiment, at least part of the batteries are connected in series through a bus, and the insulating member 3 covers at least part of the structure of the multiple batteries 11 connected in series. There is a height difference between the pole and the battery shell. When the bus is electrically connected to the pole and the battery shell respectively, the connection strength between the bus and the pole and the battery shell is weak. When the battery vibrates, the bus, the pole and the battery shell are prone to breakage. In this exemplary embodiment, the insulating member 3 covers at least part of the structure of the multiple batteries 11 connected in series. The insulating member 3 can fix the adjacent batteries together, thereby improving the stability of the battery structure and reducing the risk of the bus, the pole and the battery shell being easily broken.

[0046] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0047] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.

[0048] In other exemplary embodiments, the battery may be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and may be arc transitions.

[0049] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0050] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0051] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0052] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.

[0053] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0054] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0055] It should be noted that the battery device proposed in the utility model can be used in various electrical devices, such as mobile phones, portable devices, laptops, various vehicles (such as battery cars, electric cars, etc.), ships, spacecraft, electric toys and electric tools, etc. Further, the above-mentioned spacecraft may include, for example, airplanes, rockets, space shuttles and spacecrafts. The above-mentioned electric toys may include, for example, fixed or mobile electric toys (such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.). The above-mentioned electric tools may include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers. It should be understood that in various possible embodiments that conform to the design concept of the utility model, the cylindrical battery or battery device proposed in the utility model is not limited to the above-described devices, but can also be applied to all devices using batteries. For the sake of simplicity, the various embodiments in this specification are described by taking vehicles as an example.

[0056] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0057] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0058] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery device, characterized in that: The battery device comprises: A battery unit (1), the battery unit (1) comprising a plurality of batteries (11), the battery (11) comprising a battery housing (111) and a pole (112), the pole (112) being arranged on the battery housing (111), and the pole (112) protruding from the outer surface of the battery housing (111), the battery housing (111) and the pole (112) respectively forming electrode output ends of the battery (11), and the polarities of the battery housing (111) and the pole (112) being opposite; A busbar (2) located at a side of the battery (11) provided with a pole (112), the busbar comprising a first connecting portion (21) and a second connecting portion (22), the first connecting portion (21) electrically connected to the pole (112) of at least part of the battery (11), and the second connecting portion (22) electrically connected to the battery casing (111) of at least another part of the battery (11); An insulating member (3) is located between the busbar and the battery housing (111), and the insulating member (3) covers at least a portion of the structure of the plurality of batteries (11) in the battery unit (1).

2. The battery device according to claim 1, characterized in that: The pole (112) is located on one side of the battery housing (111) in a first direction (Z), and the ratio of the thickness of the insulating member (3) in the first direction (Z) to the thickness of the busbar (2) in the first direction (Z) is 1 / 15-5.

3. The battery device according to claim 1, characterized in that: A first through hole (41) is formed on the insulating member (3), and the pole (112) is arranged to pass through the first through hole (41).

4. The battery device according to claim 3, characterized in that: The minimum distance between the inner edge of the first through hole (41) and the outer edge of the pole (112) is 0.1 mm to 2 mm.

5. The battery device according to claim 1, characterized in that: The pole (112) is located on one side of the battery housing (111) in a first direction (Z), and the ratio of the thickness of the insulating member (3) in the first direction (Z) to the size of the pole (112) in the first direction (Z) is 1 / 10-1.

6. The battery device according to claim 1, characterized in that: The pole (112) is located on one side of the battery housing (111) in a first direction (Z); The insulating member (3) comprises a first insulating portion (31) and a second insulating portion (32), wherein a projection of the first insulating portion (31) in the first direction (Z) overlaps with a projection of the busbar (2) in the first direction (Z), and a projection of the second insulating portion (32) in the first direction (Z) does not overlap with a projection of the busbar (2) in the first direction (Z); The thickness of the second insulating portion (32) in the first direction (Z) is greater than the thickness of the first insulating portion (31) in the first direction (Z).

7. The battery device according to any one of claims 1 to 6, characterized in that: The battery unit (1) comprises a plurality of battery rows (11x) distributed along a second direction (Y), the battery row (11x) comprises a plurality of batteries (11) distributed along a third direction (X), and the second direction (Y) and the third direction (X) intersect; The batteries (11) in the adjacent battery rows (11x) in the second direction (Y) are sequentially staggered in the third direction (X), and at least some of the batteries (11) and two batteries (11) in the adjacent battery rows (11x) are arranged adjacent to each other and form a gap (5); A second through hole (42) is formed on the insulating member (3), and the second through hole (42) and the gap (5) are arranged opposite to each other.

8. The battery device according to any one of claims 1 to 6, characterized in that: The pole (112) is located on one side of the battery housing (111) in a first direction (Z), the projection area of ​​the insulating member (3) in the first direction (Z) is S1, the outer contour area of ​​the side wall of the battery (11) provided with the pole (112) is S2, and S1 / S2 is 1 / 2-3 / 4.

9. The battery device according to any one of claims 1 to 6, characterized in that: The battery device further comprises: A battery box (6), wherein the battery (11) is located in the battery box (6), and the insulating member (3) is fixed on the battery box (6); Alternatively, the insulating member (3) is fixed on the battery (11) covered by the insulating member (3).

10. The battery device according to any one of claims 1 to 6, characterized in that: The battery (11) is a cylindrical battery.

11. The battery device according to any one of claims 1 to 6, characterized in that: At least part of the batteries are connected in series via the busbar, and the insulating member (3) covers at least part of the structure of the plurality of batteries (11) connected in series.

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