Battery device and electric equipment

Abstract

The battery device comprises a battery cell group and a first lead-out piece, the battery cell group comprises a first battery cell and a second battery cell which are arranged side by side, the first battery cell is provided with a first tab and a second tab, the second battery cell is provided with a third tab and a fourth tab, and the first tab and the third tab have the same polarity and are located on the same side of the battery cell group; the second tab and the fourth tab have the same polarity and are positioned on the other opposite side of the battery cell group; and the first lead-out sheet is of an integrated structure and is conductively connected with the first tab and the third tab. The first lead-out sheet is conductively connected with the first tab of the first battery cell and the third tab on the same side of the second battery cell, and the tabs of the battery cell group are respectively positioned on two sides of the battery cell group and are directly connected with the lead-out sheet, so that the temperature distribution of the battery cell group is relatively uniform, and the performance of the battery device can be improved.

Description

Technical Field

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

[0002] Lithium-ion batteries have the advantages of high specific energy, many cycles, and long storage time. They are not only widely used as consumer batteries in portable electronic devices, but also widely used as power batteries in large and medium-sized electric equipment. In recent years, with the development of the energy storage industry, they have also been widely used as energy storage batteries in the fields of energy storage and power batteries.

[0003] With the development of the industry, large-capacity energy storage batteries have become a general trend. However, due to the insufficient ultrasonic welding capabilities, the size of the stacking / winding is greatly limited, and it is difficult to make a single cell infinitely larger, making it difficult to meet the development needs of large-capacity energy storage batteries.

[0004] Currently, multiple battery cells are used to meet the demand for large-capacity batteries. The positive and negative tabs of multiple battery cells are located on the same side, which will cause uneven temperature distribution of the battery cells and affect battery performance. Utility Model Content

[0005] The utility model aims to provide a battery device and an electric equipment, which can solve the problem that the tabs of multiple battery cells are located on the same side, resulting in uneven temperature distribution of the battery cells.

[0006] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0007] In a first aspect, the utility model provides a battery device, comprising a battery cell group and a first lead-out plate, the battery cell group comprising a first battery cell and a second battery cell arranged side by side, the first battery cell having a first pole lug and a second pole lug, the second battery cell having a third pole lug and a fourth pole lug, the first pole lug and the third pole lug having the same polarity and being located on the same side of the battery cell group, the second pole lug and the fourth pole lug having the same polarity and being located on the other side of the battery cell group opposite to each other; the first lead-out plate is an integrated structure, and the first lead-out plate is conductively connected to the first pole lug and the third pole lug.

[0008] In one embodiment, the first lead-out piece includes a first connecting portion, a first transition portion, and a second transition portion, the first connecting portion includes a first surface facing the battery cell group, the first transition portion and the second transition portion are connected at two opposite ends of the first connecting portion, the first transition portion and the second transition portion both protrude from the first surface, the first transition portion is connected to the first pole ear, and the second transition portion is connected to the third pole ear.

[0009] In one embodiment, the first transition portion includes a first surface and a second surface opposite to each other, the second lead-out piece includes a third surface and a fourth surface opposite to each other, the first surface and the third surface are respectively connected to the first surface; the first pole ear is connected to the second surface, and the third pole ear is connected to the fourth surface.

[0010] In one embodiment, the first transition portion includes a first sub-portion, a second sub-portion, and a third sub-portion connected in sequence, the first sub-portion is connected to the first connecting portion at one end away from the second sub-portion, the third sub-portion is welded to the first pole tab, and the first sub-portion, the first pole tab, and the third sub-portion are stacked in a direction perpendicular to the first surface.

[0011] In one implementation, a first angle α is formed between the first face and the first surface, satisfying: 0°≤α≤95°.

[0012] In one embodiment, at least a portion of the first side is opposite to the first surface.

[0013] In one implementation, the first transition portion has a first thickness D1 that satisfies: 0.3 mm ≤ D1 ≤ 2.0 mm; and / or the second transition portion has a second thickness D2 that satisfies: 0.3 mm ≤ D2 ≤ 2.0 mm.

[0014] In one implementation manner, the first transition portion has a first thickness D1, and the first connection portion has a third thickness D3, satisfying: 1≤D3 / D1≤6.

[0015] In one implementation, the first transition portion and the second transition portion are symmetrical with respect to the first connecting portion.

[0016] In one embodiment, the battery device further includes a second lead-out tab, which is conductively connected to the second electrode tab and the fourth electrode tab, and the structure of the second lead-out tab is the same as that of the first lead-out tab.

[0017] In one embodiment, the battery device further includes a shell and a first pole, the battery cell group is accommodated in the shell, the first lead-out piece is provided with a first fixing hole, and the first pole is cooperatively connected with the first fixing hole.

[0018] In a second aspect, the utility model further provides an electrical equipment, comprising an electrical device and a battery device as described in any one of the various embodiments of the first aspect, wherein the battery device supplies power to the electrical device.

[0019] By arranging the first battery cell and the second battery cell, the first lead-out plate is conductively connected to the first pole tab of the first battery cell and the third pole tab on the same side of the second battery cell, and the pole tabs of the battery cell group are respectively located on both sides of the battery cell group and directly connected to the lead-out plate, so that the temperature distribution of the battery cell group is more uniform, which can improve the performance of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a front view of a battery device according to an embodiment;

[0022] Figure 2 is a side cross-sectional view of a battery device at AA according to an embodiment;

[0023] Figure 3 is a side cross-sectional view of a battery device according to another embodiment;

[0024] Figure 4 is a side cross-sectional view of a battery device according to another embodiment.

[0025] Description of reference numerals:

[0026] 100-battery device;

[0027] 11-first battery cell, 111-first pole ear, 12-second battery cell, 121-third pole ear, 13-baffle;

[0028] 20-first lead-out piece, 21-first connecting portion, 211-first surface, 22-first transition portion, 221-first sub-portion, 222-second sub-portion, 223-third sub-portion, 224-first surface, 225-second surface, 23-second transition portion, 231-third surface, 232-fourth surface, 24-first fixing hole;

[0029] α-first angle, β-second angle;

[0030] 30-housing, 31-accommodating chamber;

[0031] 40 - first end cover assembly, 41 - first cover plate, 42 - insulating member, 43 - first pole, 431 - insulating ring, 432 - conductive rivet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] At present, lithium-ion batteries have the advantages of high specific energy, many cycles, and long storage time. They are not only widely used as consumer batteries in portable electronic devices, but also widely used as power batteries in large and medium-sized electric equipment. In recent years, with the development of the energy storage industry, they have also been widely used as energy storage batteries in the fields of energy storage and power batteries.

[0037] With the development of the industry, large-capacity energy storage batteries have become a general trend. Limited by the insufficient ultrasonic welding capacity, the size of the stacking / winding is greatly limited, and it is difficult to infinitely enlarge a single cell, which is difficult to meet the development needs of large-capacity energy storage batteries. And as the size of the monopolar core increases, the energy required in the laser welding process also increases.

[0038] Currently, multiple battery cells are used to meet the demand for large-capacity batteries. The tabs of multiple battery cells are located on the same side. During assembly, the positive tabs and negative tabs of multiple battery cells need to be pre-welded and merged into one positive tab and one negative tab, and then welded to the lead-out sheets, which is a complicated operation.

[0039] The embodiment of the utility model provides an electric device, including an electric device and a battery device in the embodiment of the utility model, the battery device supplies power to the electric device. The electric device can be an electric vehicle, a hybrid vehicle, a base station, a household power load, etc.

[0040] Optionally, the electrical equipment in the embodiment of the present invention includes at least one battery device in the embodiment of the present invention, and the number of the battery devices may be 1, 2, 4, etc., without limitation. When there are multiple battery devices, the multiple battery devices may be arranged in series or in parallel, without limitation.

[0041] The electrical equipment in the embodiment of the utility model adopts the battery device in the embodiment of the present application, and the battery capacity is large. The pole ears of multiple battery cells are respectively located on both sides of the battery cells and are directly welded and fixed to the lead-out sheets, and the operation is simple.

[0042] The battery device in the embodiment of the utility model is described in detail below.

[0043] Please refer to Figure 1 and Figure 2 The present invention provides a battery device 100, including a battery cell group, a first lead-out sheet 20 and a second lead-out sheet (not shown in the figure). The battery device 100 can be a power battery, an energy storage battery, and the like.

[0044] Optionally, the battery cell group includes a first battery cell 11 and a second battery cell 12 arranged side by side, the first battery cell 11 has a first pole tab 111 and a second pole tab (not shown in the figure), and the second battery cell 12 has a third pole tab 121 and a fourth pole tab (not shown in the figure).

[0045] Optionally, the first battery cell 11 and the second battery cell 12 may be wound battery cells, laminated battery cells, etc., without specific limitation.

[0046] Optionally, the battery cell group further includes a baffle 13 , which is disposed between the first battery cell 11 and the second battery cell 12 arranged side by side, and two opposite sides of the baffle 13 are respectively connected to the first battery cell 11 and the second battery cell 12 .

[0047] Optionally, the baffle 13 is provided with a plurality of through holes (not shown in the figure) to facilitate the flow of electrolyte between the first battery cell 11 and the second battery cell 12 .

[0048] Optionally, the first pole lug 111 and the second pole lug extend from opposite sides of the first battery cell 11, respectively, and the third pole lug 121 and the fourth pole lug extend from opposite sides of the second battery cell 12, respectively. The first pole lug 111 and the third pole lug 121 have the same polarity and are located on the same side of the battery cell group, and the second pole lug and the fourth pole lug have the same polarity and are located on the other side of the battery cell group.

[0049] Optionally, the first pole tab 111 and the first battery cell 11 , the second pole tab and the first battery cell 11 , the third pole tab 121 and the second battery cell 12 , and the fourth pole tab and the second battery cell 12 may be connected and fixed by welding, bonding, clamping, etc. without specific limitation.

[0050] Optionally, the first lead-out piece 20 and the second lead-out piece are both integral structures, and at least partially curved.

[0051] Optionally, the first lead-out piece 20 is conductively connected to the first pole tab 111 and the third pole tab 121; the second lead-out piece is conductively connected to the second pole tab and the fourth pole tab, and the connection method can be welding, bonding, clamping, etc., without limitation.

[0052] Optionally, the material of the first lead sheet 20 and the material of the second lead sheet can be aluminum, copper, etc., without limitation. For example, if the first pole tab 111 and the third pole tab 121 are negative pole tabs, the first lead sheet 20 is a copper sheet, specifically T2Cu, etc.; if the second pole tab and the fourth pole tab are positive pole tabs, the second lead sheet is an aluminum sheet, specifically 1060Al, etc.

[0053] The existing dual-cell design adopts a same-side tab structure. After assembly and welding, the dual cells are put into the shell and the tabs are on the same side. All the tabs are located on one side of the cell. The width of the tabs will be greatly limited and cannot meet the requirements of large current charging and discharging of the battery. The temperature distribution is also not as uniform as the design with tabs on opposite sides.

[0054] The battery device 100 in the embodiment of the utility model is provided with a first battery cell 11 and a second battery cell 12, and the first lead-out tabs 20 are respectively conductively connected to the tabs on the same side of the first battery cell 11 and the second battery cell 12, and the second lead-out tabs are respectively conductively connected to the tabs on the other side of the first battery cell 11 and the second battery cell 12, and the tabs are respectively located on both sides of the battery cell group and are directly welded and fixed to the lead-out tabs, so that the temperature distribution of the battery cell group is more uniform, which can improve the performance of the battery device 100.

[0055] In addition, since the tabs are located on both sides of the battery cell group, the width of the tabs is less limited, and the wider tabs can meet the large current charging and discharging requirements of the battery device 100.

[0056] Optional, such as Figure 2 As shown, the first lead-out piece 20 includes a first connecting portion 21, a first transition portion 22, and a second transition portion 23. The first connecting portion 21 includes a first surface 211 facing the battery cell group, the first transition portion 22 and the second transition portion 23 are connected to two opposite ends of the first connecting portion 21, the first transition portion 22 and the second transition portion 23 both protrude from the first surface 211, the first transition portion 22 is welded to the first pole tab 111, and the second transition portion 23 is welded to the third pole tab 121.

[0057] Optionally, the first connecting portion 21, the first adapter portion 22 and the second adapter portion 23 may be an integrated structure, that is, the first connecting portion 21, the first adapter portion 22 and the second adapter portion 23 are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc. The first lead-out piece 20 with an integrated structure has a simple structure, is easy to manufacture, and has a low cost.

[0058] Optionally, the first connecting portion 21 , the first transition portion 22 , and the second transition portion 23 are smoothly connected.

[0059] Optionally, the shapes of the first connecting portion 21 , the first adapter portion 22 and the second adapter portion 23 may be rectangular, square, trapezoidal, etc., without specific limitation.

[0060] Optionally, the first connecting portion 21 has a certain strength, is not easy to bend, and has a stable structure. The connecting parts of the first connecting portion 21 and the first adapter portion 22, and the connecting parts of the first connecting portion 21 and the second adapter portion 23 are soft structures that are easy to bend. The material of the first adapter portion 22 and the second adapter portion 23 can be a hard structure similar to the first connecting portion 21, or a soft structure that is easy to bend, without limitation.

[0061] Optionally, the first pole ear 111 can be welded to the side of the first adapter portion 22 opposite to the second adapter portion 23, or the first pole ear 111 can be welded to the side of the first adapter portion 22 facing the second adapter portion 23. Both methods are acceptable and are not limited. The welding method of the third pole ear 121 and the second adapter portion 23 is similar to the above, which can be used as a reference and will not be repeated.

[0062] By setting the first lead-out piece 20 to include the first connecting portion 21, the first adapter portion 22 and the second adapter portion 23, the first adapter portion 22 and the second adapter portion 23 protrude from the first connecting portion 21 toward the battery cell group and are welded to the first pole tab 111 and the third pole tab 121 respectively. The welding energy directly acts on the first lead-out piece 20 and will not affect the insulation performance of other parts of the battery device 100.

[0063] Optionally, the first adapter portion 22 includes a first surface 224 and a second surface 225 opposite to each other, and the second adapter portion 23 includes a third surface 231 and a fourth surface 232 opposite to each other, and the first surface 224 and the third surface 231 are respectively connected to the first surface 211; the first pole ear 111 is welded to the second surface 225, and the third pole ear 121 is welded to the fourth surface 232.

[0064] Since it is difficult to implement laser head insertion welding at present, the tabs are welded on the opposite surfaces of the first adapter portion 22 and the second adapter portion 23, and a welding gap can be reserved between the shell and the cover plate to achieve welding when the shell is inserted.

[0065] Optionally, the welding of the second side 225 and the first pole ear 111, and the welding of the fourth side 232 and the third pole ear 121 can be connected by ultrasonic or laser welding methods, and the welding position adopts a flat welding position or a vertical welding position. The depth of the molten pool is ensured to be half of the thickness of the penetrating pole ear plus the thickness of the lead sheet to avoid the problem of welding adhesion of the fixture caused by excessive welding.

[0066] Optionally, during the welding process, the connection between the single-side pole ear and the lead-out piece can be welded first, and after the welding is completed, the pole core is flipped over, and the pole ear on the other side is flipped over to the welding surface to repeat the welding operation. Alternatively, double-station welding can be used to simultaneously weld the positive and negative poles, and the fixture can be added with a flipping mechanism. After the front side is welded, the back side is flipped over for welding, which reduces the steps of loading and unloading the battery pack.

[0067] By setting the first adapter part 22 to include the first surface 224 and the second surface 225 opposite to each other, and the second adapter part 23 to include the third surface 231 and the fourth surface 232 opposite to each other, the first surface 224 and the third surface 231 are opposite to each other and are respectively connected to the first surface 211; the first pole ear 111 is welded to the second surface 225, and the third pole ear 121 is welded to the fourth surface 232, so as to facilitate welding.

[0068] Optional, such as Figure 3 As shown, the first transition portion 22 includes a first sub-portion 221, a second sub-portion 222 and a third sub-portion 223 which are connected in sequence, the first sub-portion 221 is connected to the first connecting portion 21 at one end away from the second sub-portion 222, the third sub-portion 223 is welded to the first pole ear 111, and the first sub-portion 221, the first pole ear 111 and the third sub-portion 223 are stacked in a direction perpendicular to the first surface 211.

[0069] Optionally, the first sub-section 221, the second sub-section 222 and the third sub-section 223 may be an integrated structure, that is, the first sub-section 221, the second sub-section 222 and the third sub-section 223 are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc. The first sub-section 221, the second sub-section 222 and the third sub-section 223 may also be a split structure, and the first sub-section 221, the second sub-section 222 and the third sub-section 223 may be connected and fixed by welding, bonding, clamping, screwing, etc., without limitation.

[0070] Optionally, the second sub-portion 222 is a curved plate, the first sub-portion 221 and the third sub-portion 223 are straight plates, the first sub-portion 221, the first pole tab 111 and the third sub-portion 223 are stacked in a direction perpendicular to the first surface 211, that is, the first pole tab 111 is sandwiched between the first sub-portion 221 and the third sub-portion 223, or the first pole tab 111, the third sub-portion 223 and the first sub-portion 221 are stacked in sequence.

[0071] Optionally, the first transition portion 22 is a soft structure, and pre-folding lines are provided between the first sub-portion 221 and the first connecting portion 21, between the first sub-portion 221 and the second sub-portion 222, and between the second sub-portion 222 and the third sub-portion 223. During welding, the first transition portion 22 is a straight plate as a whole. After welding, the second sub-portion 222 and the portion where the first sub-portion 221 and the first connecting portion 21 are connected are bent along the pre-folding lines so that the first transition portion 22 is bent to the inside as shown in FIG. Figure 3 As shown, the tab can be bent into the shell better, reducing the difficulty of bending the tab.

[0072] Optionally, the bending process may be manual bending or mechanical tab folding knife folding, without specific limitation.

[0073] By setting the first adapter portion 22 to include a first sub-portion 221, a second sub-portion 222 and a third sub-portion 223 connected in sequence, the end of the first sub-portion 221 away from the second sub-portion 222 is connected to the first connecting portion 21, and the third sub-portion 223 is welded to the first pole ear 111. After the connection, the first pole ear 111 is folded into the interior of the shell through a pole ear bending process, thereby improving the internal space utilization rate of the battery device 100.

[0074] Optionally, a first angle α is formed between the first face 224 and the first surface 211 , satisfying: 0°≤α≤95°.

[0075] Optionally, the value of the first angle α can be 0°, 30°, 60°, 90°, etc., without limitation.

[0076] Optionally, at least a portion of the first surface 224 is opposite to the first surface 211, such as Figure 4 As shown, the first electrode tab 111 , the first adapter portion 22 and the first connecting portion 21 are stacked in sequence, which can better utilize the internal space of the battery device 100 .

[0077] Optionally, when the first angle α is 90°, Figure 2 As shown, the first adapter portion 22 is perpendicular to the first surface 211 , and the first adapter portion 22 is a hard structure, which can reduce the difficulty of assembling the battery device 100 .

[0078] By setting a first angle α between the first face 224 and the first surface 211 to satisfy: 0°≤α≤95°, different angles between the first adapter portion 22 and the first connecting portion 21 can be suitable for connection with different battery devices 100, and the application range is wider.

[0079] Optionally, the first adapter portion 22 and the second adapter portion 23 are symmetrical with respect to the first connecting portion 21 .

[0080] Optional, such as Figure 2As shown, there is a second angle β between the second transition portion 23 and the first surface 211, which satisfies: 0°≤β≤95°. The value of the second angle β is the same as the first angle α, which can be 0°, 90°, etc., without limitation.

[0081] By arranging the first adapter portion 22 and the second adapter portion 23 symmetrically relative to the first connecting portion 21 , the second adapter portion 23 is connected to the third pole tab 121 and has the same structure as the first adapter portion 22 , and while connecting the two pole tabs of the battery cell group respectively, the internal space of the battery device 100 can be better utilized.

[0082] Optionally, the first transition portion 22 has a first thickness D1 that satisfies: 0.3 mm ≤ D1 ≤ 2.0 mm, and / or the second transition portion 23 has a second thickness D2 that satisfies: 0.3 mm ≤ D2 ≤ 2.0 mm.

[0083] Optionally, the specific value of the first thickness D1 can be 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, etc., without limitation.

[0084] Optionally, the second thickness D2 of the second transition portion 23 is similar to the value of the first thickness D1, and can be 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, etc., without limitation.

[0085] Optionally, the first thickness D1 and the second thickness D2 have the same value.

[0086] By setting the first thickness D1 of the first adapter part 22 and the second thickness D2 of the second adapter part 23 , the thickness is designed to be thinner while meeting the requirements of the current carrying capacity and the connection strength, so as to avoid excessive occupation of the internal space of the battery device 100 when the first adapter part 22 and the second adapter part 23 need to be bent.

[0087] Optionally, the first connection portion 21 has a third thickness D3, satisfying: 1≤D3 / D1≤6.

[0088] Optionally, the ratio D3 / D1 of the third thickness D3 to the first thickness D1 can be 2, 3, 4, 5, etc., that is, the third thickness D3 of the first connecting portion 21 can be 2, 3, 4, etc. times the first thickness D1 of the first adapter portion 22, without specific limitation.

[0089] Optionally, the ratio of the second thickness D2 to the third thickness D3 of the second connecting portion is similar to the aforementioned D3 / D1, which can be used for reference and will not be described in detail.

[0090] By setting the first connection portion 21 to have a third thickness D3, the condition 1≤D3 / D1≤6 is satisfied. The thickness of the first connection portion 21 is relatively large, which can ensure the overall structural stability of the first lead-out piece 20. The first adapter portion 22 and the second adapter portion 23 are designed to be relatively thin, which can avoid excessive occupation of the internal space of the battery device 100 when bending is required.

[0091] Optionally, the structure of the second lead-out plate (not shown in the figure) is the same as that of the first lead-out plate 20 .

[0092] Optionally, the second lead-out piece includes a second connection portion, a third transition portion, and a fourth transition portion. The second connection portion includes a second surface facing the battery cell group, the third transition portion and the fourth transition portion are connected to two opposite ends of the second connection portion, the third transition portion and the fourth transition portion both protrude from the first surface 211, the third transition portion is welded to the second pole tab, and the fourth transition portion is welded to the fourth pole tab.

[0093] By setting a second lead-out plate, the structure of the second lead-out plate is the same as that of the first lead-out plate 20. The first lead-out plate 20 and the second lead-out plate are respectively connected to the pole ear on different sides of the battery device 100, which can meet the requirements of large current charging and discharging of the battery and the temperature distribution is also relatively uniform.

[0094] Optional, such as Figure 1 and Figure 2 As shown, the battery device 100 also includes a shell 30, a first end cover assembly 40 and a second end cover assembly (not shown in the figure), the first end cover assembly 40 and the second end cover assembly are respectively connected to the two opposite ends of the shell 30, the battery cell group is accommodated in the shell 30, the first end cover assembly 40 is connected to the first lead-out plate 20, and the second end cover assembly is connected to the second lead-out plate.

[0095] Optionally, the shell 30 is made of a material with high structural strength, specifically metal material, high-strength plastic, ceramic, etc. The metal material is, for example, aluminum, aluminum alloy, magnesium alloy, iron, iron alloy, etc.

[0096] Optionally, the housing 30 includes a plurality of side panels, which are sequentially connected and enclosed to form a receiving cavity 31 , and the battery cell group is received in the receiving cavity 31 .

[0097] Optionally, the housing 30 may be an integrated structure, that is, the side panels are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc., without limitation. The housing 30 may also be a split structure, and the side panels may be connected and fixed by welding, bonding, clamping, screwing, etc. The wall thickness of the housing 30 may be roughly uniform at various locations, that is, the thickness of the side panels may be roughly uniform, and the thickness of each side panel may also be roughly the same.

[0098] By providing a shell 30, a first end cover assembly 40 and a second end cover assembly, the first end cover assembly 40 and the second end cover assembly are respectively connected to the two opposite ends of the shell 30, the battery cell group is accommodated in the shell 30, the first end cover assembly 40 is connected to the first lead-out plate 20, and the second end cover assembly is connected to the second lead-out plate. The structure is simple and the internal space of the battery device 100 is saved.

[0099] Optionally, the first end cover assembly 40 includes a first cover plate 41, and the second end cover assembly includes a second cover plate (not shown in the figure). The first cover plate 41 and the second cover plate are respectively connected to the two opposite ends of the shell 30. The connection method between the first cover plate 41 and the second cover plate and the shell 30 can be welding, bonding, clamping, screwing, etc., without limitation.

[0100] Optionally, the material of the first cover plate 41 and the second cover plate may specifically be metal material, high-strength plastic, ceramic, etc. The metal material is, for example, aluminum, aluminum alloy, magnesium alloy, iron, iron alloy, etc.

[0101] Optionally, one of the first cover plate 41 and the second cover plate is a positive electrode cover plate, and the other is a negative electrode cover plate. The positive electrode cover plate is provided with a liquid injection hole, and the liquid injection hole is provided with a countersunk hole structure for locating the position of the sealing cap. The negative electrode cover plate is provided with an explosion-proof valve, which is connected to the cover plate by laser welding. The explosion-proof valve is an important component to ensure the safety of battery use. When the internal pressure of the battery rises to a certain value, the explosion-proof valve is broken, thereby avoiding the occurrence of battery bulging and explosion.

[0102] Optionally, the first end cover assembly 40 and the second end cover assembly both include an insulating member 42, and two opposite surfaces of the insulating member 42 are respectively connected to the lead-out plate and the cover plate.

[0103] Optionally, the material of the insulating member 42 may be insulating plastic or insulating ceramic, etc., without specific limitation. The insulating member 42 is used to prevent the lead-out plate and the cover plate from short-circuiting and causing safety problems. A buckle may be designed on the insulating member 42 for connection and fixation with the inner spacer. A hole needs to be reserved in the middle of the insulating member 42 to prevent the pole from being unable to connect with the lead-out plate. An exhaust hole / liquid injection hole is designed on one side of the insulating member 42 for exhaust of the explosion-proof valve and injection of electrolyte.

[0104] Optional, such as Figure 4 As shown, the first end cover assembly 40 further includes a first pole 43, the first lead-out piece 20 is provided with a first fixing hole 24, and the first pole 43 is matched and connected with the first fixing hole 24. The second end cover assembly further includes a second pole (not shown in the figure), the second lead-out piece is provided with a second fixing hole (not shown in the figure), and the second pole is matched and connected with the second fixing hole, and the polarity of the first pole 43 and the second pole is opposite.

[0105] Optionally, the first pole 43 includes an insulating ring 431 and a conductive rivet 432. The first pole 43 is installed in the holes reserved by the first cover plate 41 and the insulating member 42, and is connected and fixed to the first lead-out piece 20 by welding. The portion of the first pole 43 in contact with the first cover plate 41 is the insulating ring 431, which can both insulate and support and fix the conductive rivet 432. The material of the conductive rivet 432 matches the first lead-out piece 20, and is welded and fixed to the first lead-out piece 20 to avoid the problem of poor weldability. The conductive rivet 432 and the first cover plate 41 can be connected together by brazing or other structural methods. Brazing can achieve the connection of dissimilar metals while also ensuring good electrical properties.

[0106] Optionally, the insulating ring 431 may be made of ceramic, plastic, etc., without any specific limitation.

[0107] Optionally, the structure of the second pole is the same as that of the first pole 43, which can be referred to and will not be described in detail.

[0108] Optionally, the shapes of the first fixing hole 24 and the second fixing hole may be circular, square, etc., as long as they correspond to the poles, without specific limitation.

[0109] By providing the first pole 43 and the second pole, the first pole 43 is welded and fixed to the first fixing hole 24 of the first lead-out piece 20, and the second pole is welded and fixed to the second fixing hole of the second lead-out piece. The lead-out piece connects the pole and the pole ear, which has a simple structure and a stable connection.

[0110] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described 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 cannot be understood as a limitation on the present invention.

[0111] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A battery device (100), characterized in that: include: A battery cell group, comprising a first battery cell (11) and a second battery cell (12) arranged side by side, wherein the first battery cell (11) has a first pole lug (111) and a second pole lug, and the second battery cell (12) has a third pole lug (121) and a fourth pole lug, wherein the first pole lug (111) and the third pole lug (121) have the same polarity and are located on the same side of the battery cell group, and the second pole lug and the fourth pole lug have the same polarity and are located on the other side of the battery cell group opposite to each other; A first lead-out piece (20), wherein the first lead-out piece (20) is an integrated structure, and the first lead-out piece (20) is conductively connected to the first pole tab (111) and the third pole tab (121).

2. The battery device (100) according to claim 1, characterized in that: The first lead-out piece (20) comprises a first connecting portion (21), a first transition portion (22) and a second transition portion (23); the first connecting portion (21) comprises a first surface (211) facing the battery cell group; the first transition portion (22) and the second transition portion (23) are connected at two opposite ends of the first connecting portion (21); the first transition portion (22) and the second transition portion (23) both protrude from the first surface (211); the first transition portion (22) is connected to the first pole lug (111), and the second transition portion (23) is connected to the third pole lug (121).

3. The battery device (100) according to claim 2, characterized in that: The first transition portion (22) includes a first surface (224) and a second surface (225) opposite to each other, and the second transition portion (23) includes a third surface (231) and a fourth surface (232) opposite to each other, the first surface (224) and the third surface (231) are respectively connected to the first surface (211); the first pole ear (111) is connected to the second surface (225), and the third pole ear (121) is connected to the fourth surface (232).

4. The battery device (100) according to claim 2, characterized in that: The first transition portion (22) comprises a first sub-portion (221), a second sub-portion (222) and a third sub-portion (223) which are connected in sequence, wherein one end of the first sub-portion (221) away from the second sub-portion (222) is connected to the first connecting portion (21), and the third sub-portion (223) is welded to the first pole lug (111), and the first sub-portion (221), the first pole lug (111) and the third sub-portion (223) are stacked in a direction perpendicular to the first surface (211).

5. The battery device (100) according to claim 3, characterized in that: A first angle α is formed between the first face (224) and the first surface (211), satisfying the following relationship: 0°≤α≤95°.

6. The battery device (100) according to claim 3, characterized in that: At least a portion of the first face (224) is opposite to the first surface (211).

7. The battery device (100) according to claim 2, characterized in that: The first transition portion (22) has a first thickness D1, which satisfies: 0.3 mm ≤ D1 ≤ 2.0 mm; and / or the second transition portion (23) has a second thickness D2, which satisfies: 0.3 mm ≤ D2 ≤ 2.0 mm.

8. The battery device (100) according to claim 2, characterized in that: The first transition portion (22) has a first thickness D1, and the first connection portion (21) has a third thickness D3, satisfying: 1≤D3 / D1≤6.

9. The battery device (100) according to claim 2, characterized in that: The first transition portion (22) and the second transition portion (23) are symmetrical relative to the first connecting portion (21).

10. The battery device (100) according to claim 1, characterized in that: The battery device (100) further comprises a second lead-out piece, the second lead-out piece being conductively connected to the second pole tab and the fourth pole tab; the structure of the second lead-out piece is the same as that of the first lead-out piece (20).

11. The battery device (100) according to claim 1, characterized in that: The battery device (100) further comprises a housing (30) and a first pole (43); the battery cell group is accommodated in the housing (30); the first lead-out piece (20) is provided with a first fixing hole (24); and the first pole (43) is cooperatively connected to the first fixing hole (24).

12. An electrical device, characterized in that: The invention comprises an electric device and a battery device (100) as claimed in any one of claims 1 to 11, wherein the battery device (100) supplies power to the electric device.

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