Battery shell and battery pack

Abstract

The utility model provides a battery shell and a battery pack, the structure of the battery shell comprises a shell main body, and a plurality of cavities for placing battery cells are formed in the shell main body; the plurality of first pole columns are arranged in the shell main body, the first pole columns are arranged corresponding to the positions of the tabs of the battery cell, and the first pole columns are used for being conductively connected with the tabs of the battery cell; the plurality of first pole columns are arranged outside the shell main body, the plurality of second pole columns are arranged outside the shell main body, the first pole columns are conductively connected with the second pole columns, at least part of the second pole columns can conductively connect two adjacent first pole columns, and then the tabs of two adjacent battery cells are conductively connected. The battery shell and the battery pack can solve the problem that the battery cells need to be assembled when the battery pack is produced.

Description

Technical Field

[0001] The present application relates to the technical field of battery packaging, and in particular to a battery casing and a battery pack. Background Art

[0002] Lithium-ion batteries, with their excellent electrical properties and no environmental pollution, have become the most promising power batteries for electric vehicles and have broad market application prospects.

[0003] Generally, the production steps of automotive lithium-ion batteries include the production of battery cells and the welding and assembly of battery modules or whole packs. The battery cells need to be welded and assembled through metal connecting pieces to form battery modules and battery packs. The assembly process between battery cells requires workshop space, equipment, tooling, and manpower, and the process is complex and costly. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a battery housing and a battery pack to solve the problem of assembling battery cells when producing a battery pack.

[0005] According to the first aspect of the utility model, a battery case is provided, wherein the battery case comprises: a case body, a plurality of cavities for placing battery cells are formed inside the case body; a plurality of first poles are arranged inside the case body, the first poles are arranged corresponding to the positions of the tabs of the battery cells, and the first poles are used to be conductively connected to the tabs of the battery cells; and a plurality of second poles are arranged outside the case body, the first poles are conductively connected to the second poles, and at least part of the second poles can be conductively connected to two adjacent first poles, thereby conductively connecting the tabs of two adjacent battery cells.

[0006] Preferably, the multiple second poles include: a short pole, which is arranged corresponding to the cavity located at the end of the shell body, and the short pole is conductively connected to a single first pole; and a long pole, the two ends of the long pole are respectively conductively connected to two adjacent first poles, and then conductively connected to the pole ears of two adjacent battery cells.

[0007] Preferably, the shell body has step portions formed at both ends in the length direction of the cavity, the first pole is arranged on the side of the step portion facing the interior of the shell body, and the second pole is arranged on the side of the step portion facing the exterior of the shell body, the first pole and the second pole are conductively connected through a connecting column, and the connecting column is passed through the step portion.

[0008] Preferably, a first plastic for insulation is provided between the first pole and the step portion, a second plastic for insulation is provided between the second pole and the step portion, and the connecting column passes through the first plastic and the second plastic.

[0009] Preferably, a fuse device is provided in the middle of the long pole, a through hole is opened inside the second plastic corresponding to the long pole, and the long pole passes through the through hole, so that the fuse device is wrapped inside the second plastic.

[0010] Preferably, a first sealing ring is provided between the first plastic and the step portion, and a second sealing ring is provided between the second plastic and the step portion.

[0011] Preferably, a plurality of the cavities are arranged at intervals along the length direction of the shell body inside the shell body, and a partition is provided between two adjacent cavities.

[0012] Preferably, the shell body is formed with an open side for placing the battery cell, and the battery shell also includes a cover plate, which is arranged on the open side of the shell body, the outer periphery of the cover plate is welded to the periphery of the open side of the shell body, and the middle part of the cover plate is welded to the end face of the partition.

[0013] Preferably, the shell body further comprises: a liquid injection hole, which is arranged at a first end in the length direction of the cavity; and an explosion-proof valve, which is arranged at a second end in the length direction of the cavity.

[0014] According to a second aspect of the present invention, a battery pack is provided, wherein the battery pack comprises a plurality of battery cells and the battery casing as described above, and the plurality of battery cells are respectively disposed in a plurality of cavities of the battery casing.

[0015] The battery case and battery pack of the embodiment of the utility model have a plurality of cavities for placing battery cells formed inside the shell body, and a plurality of first poles are arranged inside the shell body. The first pole is arranged corresponding to the position of the pole lug of the battery cell, and is used for conductive connection with the pole lug of the battery cell. A plurality of second poles are arranged outside the shell body, the first pole is conductively connected to the second pole, and at least part of the second pole can be conductively connected to two adjacent first poles, thereby conductively connecting the pole lugs of two adjacent battery cells, thereby eliminating the assembly process between battery cell monomers, and directly producing a battery pack by placing the produced battery cell monomers into the battery case, thereby reducing the manufacturing cost, and thus effectively solving the problem of assembly between battery cell monomers required for producing battery packs.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a battery housing and a battery pack according to the utility model.

[0019] Figure 2 It is a structural schematic diagram of a battery housing and a battery pack according to the utility model.

[0020] Figure 3 It is a schematic diagram of a battery housing according to the utility model.

[0021] Figure 4 It is a schematic diagram of the battery housing according to another angle of the present invention.

[0022] Figure 5 It is a structural schematic diagram of a battery housing according to the utility model.

[0023] Figure 6 It is a schematic diagram of the battery housing according to another angle of the present invention.

[0024] Figure 7 yes Figure 6 Cross-sectional view of part A.

[0025] Figure 8 It is a schematic diagram of a shell body and a cover plate according to the utility model.

[0026] Figure numerals: 1-first pole; 11-first plastic; 110-first sealing ring; 2-second pole; 201-short pole; 202-long pole; 2021-fuse device; 21-second plastic; 210-second sealing ring; 3-shell body; 30-cavity; 300-partition; 301-connecting column; 31-step portion; 4-cover; 40-weld mark; 5-battery cell; 51-ear; 6-liquid injection hole; 7-explosion-proof valve; 8-battery pack. DETAILED DESCRIPTION

[0027] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0028] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0029] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0030] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0031] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0032] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0033] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0034] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0036] like Figures 1 to 8 As shown, according to a first aspect of the present utility model, a battery housing is provided, which includes a housing body 3 , a plurality of first poles 1 and a plurality of second poles 2 .

[0037] In the following description, reference will be made to Figures 1 to 8 The specific structure of the above components of the battery housing and the connection relationship of the above components are specifically described.

[0038] like Figures 1 to 8As shown, in an embodiment, a plurality of cavities 30 for placing the battery cells 5 may be formed inside the shell body 3. A plurality of first poles 1 may be arranged inside the shell body 3. The first pole 1 may be arranged corresponding to the position of the pole lug 51 of the battery cell 5. The first pole 1 may be used for conductive connection with the pole lug 51 of the battery cell 5. A plurality of second poles 2 may be arranged outside the shell body 3. The first pole 1 is conductively connected to the second pole 2, and at least part of the second pole 2 can conductively connect two adjacent first poles 1, thereby conductively connecting the pole lugs 51 of two adjacent battery cells 5, thereby eliminating the assembly process between the monomers of the battery cell 5. The operator can directly produce the battery pack 8 by placing the produced battery cell 5 into the battery shell, thereby reducing the manufacturing cost.

[0039] Preferably, Figures 1 to 8 As shown, in the embodiment, the shape of the shell body 3 can be approximately a rectangular parallelepiped, and a plurality of cavities 30 can be arranged in a row in the shell body 3. More preferably, the shape of the cavity 30 can be approximately a rectangular parallelepiped, and the length direction of the cavity 30 can be perpendicular to the length direction of the shell body 3 to make full use of the internal space of the shell body 3. Preferably, a plurality of cavities 30 can be arranged at equal intervals along the length direction of the shell body 3 inside the shell body 3, and a partition 300 can be provided between adjacent cavities 30, so that the battery cells 5 in each cavity 30 can be relatively independently sealed. Preferably, the partition 300 can be integrally formed with the shell body 3, that is, the interior of the shell body 3 is divided by a plurality of partitions 300 to form a plurality of cavities 30.

[0040] Preferably, in the embodiment, 2 to 20 cavities 30 (four cavities 30 are provided in the embodiment of the present application) may be provided in the shell portion 51, and the length directions of the cavities 30 are parallel. The shell body 3 may be formed with an opening side for placing the battery cell 5 (i.e., Figure 3 As shown, the upper side of the housing body 3 can be formed as an open side). In addition, the battery housing can also include a cover plate 4. The cover plate 4 is used to cover the open side of the housing body 3, thereby sealing the housing body 3. The shape of the cover plate 4 can be similar to the shape of the open side of the housing body 3, so that the cover plate 4 can be well welded to the open side of the housing body 3. Specifically, as Figure 8 As shown, the outer periphery of the cover plate 4 can be welded to the periphery of the opening side of the shell body 3, and the middle part of the cover plate 4 can be welded to the end face of the partition 300 (i.e., as shown in FIG. Figure 8 The individual sealing of each battery cell 5 is achieved as shown in the position of the welding mark 40 in the middle.

[0041] Preferably, Figures 1 to 4As shown, in an embodiment, the shell body 3 may further include an injection hole 6 and an explosion-proof valve 7. Preferably, the injection hole 6 may be arranged at the first end in the length direction of the cavity 30, and the explosion-proof valve 7 may be arranged at the second end in the length direction of the cavity 30. That is, each cavity 30 is provided with a corresponding injection hole 6 and an explosion-proof valve 7, and the injection hole 6 and the explosion-proof valve 7 are respectively arranged at both ends in the length direction of the cavity 30. The injection hole 6 and the explosion-proof valve 7 are formed on the shell body 3. Among them, the injection hole 6 is used to inject electrolyte into the cavity 30, and the explosion-proof valve 7 is used to discharge gas when the battery pack 8 is thermally runaway.

[0042] Preferably, Figures 1 to 7 As shown, in the embodiment, the shell body 3 may be formed with a step portion 31 at both ends of the cavity 30 in the length direction. The length of the step portion 31 may be less than the width of the cavity 30, and the step portion 31 may be located at the center of the end of the cavity 30. The first pole 1 may be arranged on the side of the step portion 31 facing the inside of the shell body 3, that is, each cavity 30 is provided with a first pole 1 at both ends in the length direction. Specifically, the first pole 1 may be a sheet-like structure, and the first pole 1 may be arranged on the table of the step portion 31 facing the inside of the shell body 3. After the battery cell 5 is installed in the cavity 30, the two pole ears 51 of the battery cell 5 are respectively welded to the first pole 1 at both ends of the cavity 30 to achieve a conductive connection between the battery cell 5 and the first pole 1. Preferably, the position where the pole ear 51 is welded to the first pole 1 may be provided with a glue protection or a glue point protection. The second pole 2 may be arranged on the side of the step portion 31 facing the outside of the shell body 3. Specifically, the second pole 2 may also be formed into a sheet structure, and the second pole 2 may be arranged on the table surface of the step portion 31 facing the outside of the shell body 3, that is, the first pole 1 and the second pole 2 are respectively arranged on both sides of the step portion 31. The first pole 1 and the second pole 2 may be conductively connected through a connecting column 301, and the connecting column 301 is penetrated through the step portion 31.

[0043] More preferably, Figures 1 to 7 As shown, in the embodiment, a first plastic 11 for insulation may be provided between the first pole 1 and the step portion 31. Preferably, the first plastic 11 may be stacked with the first pole 1. A second plastic 21 for insulation may be provided between the second pole 2 and the step portion 31, and the second plastic 21 may be stacked with the second pole 2. The connecting column 301 may be passed through the first plastic 11 and the second plastic 21. Preferably, it may be as follows Figure 7As shown, the connecting column 301 is sequentially arranged from left to right to fix the first pole 1, the first plastic 11, the step portion 31, the second plastic 21 and the second pole 2, thereby conductively connecting the first pole 1 with the second pole 2. Preferably, the connecting column 301 can be integrally formed with the first pole 1, and the end of the connecting column 301 can be welded to the second pole 2. More preferably, a first sealing ring 110 for sealing can be provided between the first plastic 11 and the step portion 31, and a second sealing ring 210 for sealing can be provided between the second plastic 21 and the step portion 31, so as to ensure the sealing of the battery housing.

[0044] In addition, preferably, Figures 1 to 6 As shown, in an embodiment, the second pole 2 may include a short pole 201 and a long pole 202. The short pole 201 may be arranged at the end of the shell body 3 in the length direction, that is, it is arranged corresponding to the cavity 30 located at the end of the shell body 3. The shell body 3 is provided with a short pole 201 at each end in the length direction, and the short pole 201 can be used for conductive connection with the motor of the vehicle. The short pole 201 is conductively connected to a single first pole 1. The short pole 201 can be installed on a single step portion 31. Specifically, as Figure 4 As shown, in the embodiment, when the number of cavities 30 is an even number, two short poles 201 can be arranged at the two ends of the same side of the shell body 3 (when the number of cavities 30 is an odd number, the two short poles 201 can be arranged at the two ends of the opposite sides of the shell body 3). The two ends of the long pole 202 can be respectively conductively connected to the pole ears 51 of the two adjacent battery cells 5. The two ends of the long pole 202 are respectively installed on the two adjacent step portions 31, that is, the two ends of the long pole 202 are respectively conductively connected to the two adjacent first poles 1, so that the long pole 202 can be conductively connected to the two adjacent battery cells 5 to achieve series or parallel connection between the battery cells 5 (in this embodiment, it can be a series setting scheme, that is, the positive and negative poles of the two adjacent battery cells 5 are reversely set).

[0045] More preferably, Figure 4 As shown, in the embodiment, a fuse device 2021 may be further provided in the middle of the long pole 202, and the fuse device 2021 may be wrapped in the second plastic 21. Specifically, the second plastic 21 may be formed into a strip, and a through hole may be provided inside the strip for the long pole 202 to pass through. The long pole 202 is passed through the through hole of the second plastic 21, so that the fuse device 2021 can be wrapped in the second plastic 21 to prevent a large current or a short circuit of the battery pack 8.

[0046] In addition, if Figures 1 to 8As shown, according to the second aspect of the present invention, a battery pack 8 is provided, the battery pack 8 comprising a plurality of battery cells 5 and the battery casing as described above, the plurality of battery cells 5 being respectively disposed in a plurality of cavities 30 of the battery casing.

[0047] During use, the battery pack 8 can be directly formed after being produced by the battery cell production line. Each battery cell 5 is relatively independent and does not require secondary welding. It is only necessary to install the battery cell 5 in the cavity 30 of the battery shell. Each battery cell 5 is conductively connected through the first pole 1 and the second pole 2, so that the assembly process of the battery pack 8 can omit the assembly process between the battery cells 5, thereby reducing the manufacturing cost.

[0048] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery housing, characterized in that: The battery housing comprises: A shell body, wherein a plurality of cavities for placing battery cells are formed inside the shell body; A plurality of first poles are arranged inside the shell body, the first poles are arranged corresponding to the positions of the pole tabs of the battery cells, and the first poles are used for conductive connection with the pole tabs of the battery cells; and A plurality of second poles are arranged outside the shell body, the first poles are conductively connected to the second poles, and at least part of the second poles can be conductively connected to two adjacent first poles, thereby conductively connecting the pole ears of two adjacent battery cells.

2. The battery housing according to claim 1, characterized in that: The plurality of second poles include: a short pole, arranged corresponding to the cavity at the end of the shell body, the short pole being conductively connected to the single first pole; and A long pole, two ends of which are respectively conductively connected to two adjacent first poles, and further conductively connected to the pole ears of two adjacent battery cells.

3. The battery housing according to claim 2, characterized in that: The shell body has step portions formed at both ends in the length direction of the cavity, the first pole is arranged on the side of the step portion facing the interior of the shell body, the second pole is arranged on the side of the step portion facing the exterior of the shell body, the first pole is conductively connected to the second pole via a connecting column, and the connecting column is passed through the step portion.

4. The battery case according to claim 3, characterized in that: A first plastic for insulation is provided between the first pole and the step portion, a second plastic for insulation is provided between the second pole and the step portion, and the connecting column passes through the first plastic and the second plastic.

5. The battery casing according to claim 4, characterized in that: A fuse device is arranged in the middle of the long pole, a through hole is opened inside the second plastic corresponding to the long pole, and the long pole passes through the through hole, so that the fuse device is wrapped inside the second plastic.

6. The battery case according to claim 4, characterized in that: A first sealing ring is arranged between the first plastic and the step portion, and a second sealing ring is arranged between the second plastic and the step portion.

7. The battery housing according to claim 1, characterized in that: A plurality of the cavities are arranged at intervals along the length direction of the shell body inside the shell body, and a partition is provided between two adjacent cavities.

8. The battery casing according to claim 7, characterized in that: The shell body is formed with an open side for placing the battery cell. The battery shell also includes a cover plate, which is arranged on the open side of the shell body. The outer periphery of the cover plate is welded to the periphery of the open side of the shell body, and the middle part of the cover plate is welded to the end face of the partition.

9. The battery casing according to claim 7, characterized in that: The housing body also includes: A liquid injection hole, the liquid injection hole is arranged at a first end in the length direction of the cavity; and An explosion-proof valve is arranged at the second end of the cavity in the length direction.

10. A battery pack, characterized in that: The battery pack comprises a plurality of battery cells and a battery casing according to any one of claims 1 to 9, wherein the plurality of battery cells are respectively disposed in a plurality of cavities of the battery casing.

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