Battery cell and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery comprises: a housing, the housing is provided with an accommodating cavity, the housing comprises a housing and a first cover plate, the first cover plate is arranged at one end of the housing in the length direction; the first pole group and the second pole group are both arranged in the accommodating cavity, and a first pole lug of the first pole group and a second pole lug of the second pole group are both connected with the first cover plate; the second pole lug of the first pole group and the first pole lug of the second pole group are respectively connected with two ends of the series connection piece. According to the battery monomer disclosed by the utility model, the series connection piece is arranged in the shell, so that the pole groups with different sizes can be arranged in the shell with a fixed specification, the length of the battery cell is ensured to be unchanged, and the plurality of pole groups are arranged in the same shell, so that the voltage of the single battery monomer is increased, and two pole groups are arranged in the shell at one time, and the production efficiency is improved; and parts of the battery pack are reduced.

Description

Technical Field

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

[0002] Relevant technologies point out that power batteries, as a reliable energy storage device, have been widely used in new energy vehicles, energy storage and other fields.

[0003] Each automobile manufacturer has higher requirements for driving range and requires battery manufacturers to increase energy density as much as possible. Under the premise of considering safety, the application market of lithium iron phosphate has increased, and each manufacturer has further explored and increased energy density from a structural perspective. After BYD and Honeycomb launched the blade battery, the energy density of the battery cell was further improved from a structural perspective, thereby increasing the driving range of the entire vehicle and the energy density of the energy storage station.

[0004] Currently, blade batteries have appeared on the market, with sizes ranging from 300-1300mm. The shorter the length, the more batteries need to be connected in series in the length direction of the battery pack, which results in the need to reserve assembly and electrical connection gaps in the length direction of the battery pack, resulting in reduced space utilization and energy density. The longer the length of the single cell, the higher the energy density, but the worse its internal electrochemical consistency in the length direction, which is prone to the risk of thermal runaway due to lithium deposition. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell with a simple structure and a high production yield.

[0006] The utility model also provides a battery pack having the battery monomer.

[0007] A battery cell according to the first aspect of the utility model comprises: a shell, the shell is formed with a accommodating cavity, the shell comprises a shell and a first cover plate, the first cover plate is arranged at one end of the shell in the length direction; a first pole group and a second pole group, the first pole group and the second pole group are both arranged in the accommodating cavity, the first pole ear of the first pole group and the second pole ear of the second pole group are both connected to the first cover plate; a series member, the second pole ear of the first pole group and the first pole ear of the second pole group are respectively connected to the two ends of the series member.

[0008] According to the battery cell of the utility model, by arranging a series connection member in the shell, pole groups of different sizes can be arranged in the shell of fixed specifications, ensuring that the length of the battery core remains unchanged, and multiple pole groups are arranged in the same shell to increase the voltage of a single battery cell, and two pole groups are placed in the shell at one time, thereby improving production efficiency, reducing the parts of the battery pack, and reducing production costs.

[0009] In some embodiments, the series component includes: a support plate, which extends along a first direction and has a mounting portion formed on the support plate; a connecting plate, which extends along a second direction perpendicular to the first direction and is disposed in the mounting portion; and an insulating member, which is disposed between the support plate and the connecting plate.

[0010] In some embodiments, the second pole lug of the first pole group is connected to one end of the connecting piece, and the first pole lug of the second pole group is connected to the other end of the connecting piece.

[0011] In some embodiments, the connecting sheet includes a first sheet and a second sheet, and one end of the first sheet is connected to one end of the second sheet.

[0012] In some embodiments, the shell includes a second cover plate, which is arranged at the other end of the shell in the length direction, and a avoidance portion is formed on the second cover plate. The support plate is connected to the avoidance portion, and the length of the support plate is not less than the length of the avoidance portion.

[0013] In some embodiments, a liquid injection hole is formed on the second cover plate, and the liquid injection hole penetrates the second cover plate in the thickness direction of the second cover plate.

[0014] In some embodiments, a partition is provided in the shell, and the partition separates the accommodating cavity into a first cavity and a second cavity arranged in a stacked manner. The first pole group is disposed in the first cavity, and the second pole group is disposed in the second cavity.

[0015] In some embodiments, the first cover plate is provided with poles, and the poles are electrically connected to the first pole tab and the second pole tab respectively.

[0016] In some embodiments, the insulating member is a ceramic member, and / or the connecting piece is a copper-aluminum composite member.

[0017] A battery pack according to a second aspect of the present invention comprises a battery cell according to the first aspect of the present invention.

[0018] According to the battery pack of the utility model, by providing the battery cells of the first aspect, the space utilization of the battery pack is improved, the power and energy density of the whole pack are increased, the defective rate is reduced, the appearance of the battery pack is improved, the production cost is reduced, and the production efficiency is improved.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the first aspect of the utility model;

[0021] Figure 2 yes Figure 1 A schematic diagram of a front view of a battery cell shown in ;

[0022] Figure 3 yes Figure 1 A schematic diagram of a top view of a battery cell shown in ;

[0023] Figure 4 yes Figure 1 A schematic diagram of a side view of a battery cell shown in ;

[0024] Figure 5 yes Figure 1 An exploded schematic diagram of a battery cell shown in ;

[0025] Figure 6 yes Figure 1 Schematic diagram of the assembly steps of the battery cell shown in;

[0026] Figure 7 yes Figure 1 Schematic diagram of assembly steps of the housing and the series connection member shown in ;

[0027] Figure 8 yes Figure 7 Schematic diagram of the assembly completion of the housing and the series connection member shown in ;

[0028] Fig. 9 yes Figure 5 A schematic diagram of the series shown in ;

[0029] Fig.10 yes Fig. 9 An exploded schematic diagram of the series shown in FIG.

[0030] Fig.11 It is a schematic diagram of a battery pack according to an embodiment of the second aspect of the utility model.

[0031] Reference numerals:

[0032] 100. Battery cell;

[0033] 1. Shell; 11. First cavity; 12. Second cavity; 13. Partition;

[0034] 2. first cover plate; 21. pole;

[0035] 3. second cover plate; 31. avoidance portion; 32. liquid injection hole;

[0036] 4. The first pole group; 5. The second pole group;

[0037] 6. Series connection member; 61. Support plate; 62. Connecting piece; 621. First piece; 622. Second piece; 63. Insulating member;

[0038] 7. Explosion-proof valve;

[0039] 1000. Battery pack. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] Reference below Figure 1-Figure 10 A battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0042] like Figure 1-Figure 5 As shown, the battery cell 100 according to the first embodiment of the utility model includes: a housing, a first pole group 4, a second pole group 5 and a series connection member 6.

[0043] Specifically, the housing is formed with a receiving cavity, and the housing includes a housing 1 and a first cover plate 2, the first cover plate 2 is arranged at one end of the housing 1 in the length direction, the first pole group 4 and the second pole group 5 are both arranged in the receiving cavity, the first pole ear of the first pole group 4 and the second pole ear of the second pole group 5 are both connected to the first cover plate 2, and the second pole ear of the first pole group 4 and the first pole ear of the second pole group 5 are respectively connected to the two ends of the series connection member 6. Therefore, the battery cell 100 has a simple structure and high energy density.

[0044] According to the battery cell 100 of the embodiment of the utility model, by arranging a series connection member 6 in the shell 1, pole groups of different sizes can be arranged in the shell 1 of fixed specifications, ensuring that the length of the battery cell remains unchanged, and multiple pole groups are arranged in the same shell 1 to increase the voltage of a single battery cell 100, and two pole groups are put into the shell at one time, which improves production efficiency, reduces the parts of the battery pack 1000, and reduces production costs.

[0045] In some embodiments of the present invention, Fig. 9 As shown, the series connection member 6 comprises: a support plate 61, a connecting piece 62 and an insulating piece 63, the support plate 61 extends along a first direction, a mounting portion is formed on the support plate 61, the connecting piece 62 extends along a second direction perpendicular to the first direction, the connecting piece 62 is arranged in the mounting portion, and the insulating piece 63 is arranged between the support plate 61 and the connecting piece 62. Therefore, the series connection member 6 has a simple structure, a clever design, and a low production cost.

[0046] In some embodiments of the present invention, the second pole tab of the first pole group 4 is connected to one end of the connecting piece 62, and the first pole tab of the second pole group 5 is connected to the other end of the connecting piece 62. Thus, the second pole tab of the first pole group 4 is welded to one end of the connecting piece 62, and the first pole tab of the second pole group 5 is welded to the other end of the connecting piece 62, which ensures the yield rate of the battery cell 100 and improves the space utilization rate of the battery pack 1000.

[0047] In some embodiments of the present invention, the connecting piece 62 includes a first piece 621 and a second piece 622, and one end of the first piece 621 is connected to one end of the second piece 622. Thus, the structure of the connecting piece 62 is simple, which reduces the difficulty of production. Optionally, the first piece 621 and the second piece 622 can be made of the same material, or the first piece 621 and the second piece 622 can be made of different materials.

[0048] In some embodiments of the utility model, the housing includes a second cover plate 3, which is disposed at the other end of the housing 1 in the length direction, and a relief portion 31 is formed on the second cover plate 3, and the support plate 61 is connected to the relief portion 31, and the length of the support plate 61 is not less than the length of the relief portion 31. In other words, the length of the support plate 61 is greater than or equal to the length of the relief portion 31, and the relief portion 31 can be formed as a groove. As a result, the support plate 61 can be sealed and welded with the second cover plate 3, thereby improving the sealing between the support plate 61 and the second cover plate 3.

[0049] In some embodiments of the present invention, a liquid injection hole 32 is formed on the second cover plate 3, and the liquid injection hole 32 penetrates the second cover plate 3 in the thickness direction of the second cover plate 3. Figure 5 As shown, one end of the battery cell 100 is the pole 21, and the other end of the battery cell 100 is the injection hole 32, which avoids the risk of electrolyte invading the pole 21 and causing a short circuit during the production process, improves the production yield of the battery cell 100, improves the appearance of the battery cell, and solves the corrosion problem of the battery cell shell 1.

[0050] In some embodiments of the utility model, a partition 13 is provided in the housing 1, and the partition 13 divides the accommodating cavity into a first cavity 11 and a second cavity 12 arranged in a stacked manner, the first electrode group 4 is provided in the first cavity 11, and the second electrode group 5 is provided in the second cavity 12. Thus, it can be regarded that two battery cells 100 share a housing, which increases the voltage of the battery cells 100, and two electrode groups are loaded at one time, which increases the production efficiency of the battery cells 100.

[0051] Furthermore, if Figure 7As shown, the assembly process of the series component 6 and the shell 1 is described: first, the shell 1 is formed by integral extrusion, casting or splicing welding; the partition 13 of the shell 1 has a non-polar column design, and an avoidance groove is formed at one end of the partition; the series component 6 is connected to the shell 1, completely coated with solder paste, fixed with a clamp, baked at a temperature of 500-700℃ for 1-24h, and finally cooled to form.

[0052] In some embodiments of the utility model, a pole 21 is provided on the first cover plate 2, and the pole 21 is electrically connected to the first pole tab and the second pole tab respectively. As shown in the figure, one end of the battery cell 100 is the pole 21, and the other end of the battery cell 100 is the injection hole 32, which avoids the risk of electrolyte invading the pole 21 and causing a short circuit during the production process, improves the production yield of the battery cell 100, improves the appearance of the battery cell, and solves the corrosion problem of the battery cell shell 1.

[0053] In some embodiments of the present invention, the insulating member 63 is a ceramic member, and / or the connecting piece 62 is a copper-aluminum composite member. Preferably, one of the first sheet 621 and the second sheet 622 is a copper member, and the other of the first sheet 621 and the second sheet 622 is an aluminum member, and the first sheet 621 and the second sheet 622 are connected by friction welding, thereby satisfying the function of conducting electricity between the first pole group 4 and the second pole group 5.

[0054] In other embodiments, if the battery cell 100 is a sodium battery, the connecting piece 62 is an aluminum part.

[0055] The battery pack 1000 according to the embodiment of the second aspect of the present invention includes the battery cell 100 according to the embodiment of the first aspect of the present invention.

[0056] According to the battery pack 1000 of the embodiment of the utility model, by setting the battery cell 100 of the first embodiment, the space utilization rate of the battery pack 1000 is improved, the power and energy density of the whole pack are increased, the defective rate is reduced, the appearance of the battery pack 1000 is improved, the production cost is reduced, and the production efficiency is improved.

[0057] Reference Figure 5-Figure 11 As shown, the assembly process of the battery pack 1000 according to a specific embodiment of the present invention will be described below.

[0058] 1. Complete the production of positive and negative electrode sheets according to the designed formula, and group the electrode sheets and diaphragms into electrode groups by lamination or winding.

[0059] 2. After the single-pole group is manufactured, the pole ears are ultrasonically pre-welded to bind the multi-layer pole ears as a whole;

[0060] 3. First, the shell 1 is formed by integral extrusion, casting or splicing welding; one end of the partition 13 of the shell 1 is provided with a slot, and the poles 21 are all located on the first cover plate 2, and the poles 21 are connected to the pole ears of the pole group; the series connection 6 and the shell 1 are spliced ​​together, and the solder paste is completely applied, fixed with a clamp, baked at a temperature of 500-700°C for 1-24h, and finally cooled to form.

[0061] 4. The electrolyte of the first pole group 4 and the second pole group 5 is injected through the injection hole 32;

[0062] 5. Charge and form through the series connection 6, and seal after exhausting;

[0063] 6. Complete offline inspection and wrap insulation film;

[0064] 7. The cells are arranged in the battery pack 1000 according to the number of series connections. When placed, the explosion-proof valve 7 is arranged on the narrow surface of the shell 1, and the opening of the explosion-proof valve 7 is arranged downward to facilitate downward spraying of the cells when they explode. At least two explosion-proof valves 7 are arranged on the narrow surface of the first cavity 11 and the narrow surface of the second cavity 12. Figure 7 As shown, two explosion-proof valves 7 are arranged at intervals in the length direction of the housing 1;

[0065] 8. Perform laser welding to make electrical connections in series.

[0066] 9. Install all structural and electrical components to complete the assembly of the battery pack 1000.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A housing, the housing comprising a shell and a first cover plate, the shell forming a receiving cavity, the first cover plate being arranged at one end of the shell in a length direction; A first pole group and a second pole group, wherein the first pole group and the second pole group are both arranged in the accommodating cavity, and a first pole lug of the first pole group and a second pole lug of the second pole group are both connected to the first cover plate; A series connection member, wherein the second pole tab of the first pole group and the first pole tab of the second pole group are respectively connected to two ends of the series connection member.

2. The battery cell according to claim 1, characterized in that: The series connection comprises: A support plate, the support plate extending along a first direction, and a mounting portion being formed on the support plate; a connecting piece, the connecting piece extending along a second direction perpendicular to the first direction, the connecting piece being arranged in the mounting portion; An insulating member is arranged between the supporting plate and the connecting piece.

3. The battery cell according to claim 2, characterized in that: The second pole tab of the first pole group is connected to one end of the connecting piece, and the first pole tab of the second pole group is connected to the other end of the connecting piece.

4. The battery cell according to claim 3, characterized in that: The connecting sheet includes a first sheet body and a second sheet body, and one end of the first sheet body is connected to one end of the second sheet body.

5. The battery cell according to claim 2, characterized in that: The shell includes a second cover plate, which is arranged at the other end of the shell in the length direction. The second cover plate is formed with an avoidance portion. The support plate is connected to the avoidance portion, and the length of the support plate is not less than the length of the avoidance portion.

6. The battery cell according to claim 5, characterized in that: A liquid injection hole is formed on the second cover plate, and the liquid injection hole penetrates the second cover plate in a thickness direction of the second cover plate.

7. The battery cell according to claim 2, characterized in that: A partition is provided in the shell, and the partition divides the accommodating cavity into a first cavity and a second cavity which are stacked. The first pole group is provided in the first cavity, and the second pole group is provided in the second cavity.

8. The battery cell according to claim 7, characterized in that: The first cover plate is provided with poles, and the poles are electrically connected to the first pole tab and the second pole tab respectively.

9. The battery cell according to any one of claims 2 to 8, characterized in that: The insulating member is a ceramic member, and / or the connecting piece is a copper-aluminum composite member.

10. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 9.

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