Battery cell holder and battery pack

Abstract

Disclosed are a battery cell holder for accommodating battery cells and a battery pack. The cell holder includes: an upper cover configured to extend around an upper portion of the battery cell while exposing a first electrode terminal of the battery cell; and a lower cover configured to extend around a lower portion of the battery cell while exposing a second electrode terminal of the battery cell, the lower cover and the upper cover being coupled to each other. A pair of partition sides of the upper cover and the lower cover that are in contact with each other when the upper cover and the lower cover are joined together extend obliquely.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0125942, filed on September 13, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] Embodiments of this disclosure relate to a battery cell holder and a battery pack. Background Technology

[0003] Battery packs, including secondary batteries, supply power by interconnecting multiple battery cells, and the number and connection configuration of the battery cells are designed based on the device to be applied to the battery pack. When battery packs are formed using cylindrical secondary batteries, the cylindrical secondary batteries typically require securing devices (such as retainers) due to their shape to hold the arrangement of the battery cells. Therefore, forming battery packs with cylindrical secondary batteries requires manufacturing securing devices of different sizes depending on the number of batteries to be assembled together. Summary of the Invention

[0004] Embodiments of this disclosure provide a battery cell holder and a battery pack in which some of the separating sides of the upper and lower covers extend obliquely at the point where they contact each other.

[0005] According to embodiments of this disclosure, a battery cell holder for accommodating a battery cell includes: an upper cover configured to extend around an upper portion of the battery cell while exposing a first electrode terminal of the battery cell; and a lower cover configured to extend around a lower portion of the battery cell while exposing a second electrode terminal of the battery cell, the lower cover and the upper cover being joined together. A pair of separating sides of the upper cover and the lower cover that contact each other when joined together extend obliquely.

[0006] The other pair of separating sides of the upper and lower covers that come into contact with each other when the upper and lower covers are joined together can extend horizontally.

[0007] At least some of the separating sides of the upper and lower covers can extend horizontally.

[0008] The upper cover may include a connecting protrusion extending toward the lower cover.

[0009] The lower cover may have a mating groove configured to accommodate the mating protrusion.

[0010] The size of the groove can be larger than the size of the protrusion.

[0011] At least one of the upper and lower covers may have a transverse side formed by surfaces with different slopes relative to each other.

[0012] At least one of the top cover and the bottom cover may include an inwardly formed protrusion to prevent the battery cell from separating from at least one of the top cover and the bottom cover.

[0013] At least one of the top cover and the bottom cover may have a hollow triangular corner.

[0014] According to another embodiment of this disclosure, a battery pack includes: a plurality of battery cells; and a plurality of battery cell holders, each accommodating a battery cell therein. Each of the battery cell holders includes: an upper cover extending around the upper portion of a corresponding battery cell, exposing a first electrode terminal through the upper cover; and a lower cover extending around the lower portion of a corresponding battery cell, exposing a second electrode terminal through the lower cover, the lower cover and the upper cover being joined together. A pair of separating sides of the upper cover and the lower cover that contact each other when the upper cover and the lower cover are joined together extend obliquely.

[0015] The other pair of separating sides of the upper and lower covers that come into contact with each other when the upper and lower covers are joined together can extend horizontally.

[0016] At least some of the separating sides of the upper and lower covers can extend horizontally.

[0017] The upper cover may include a connecting protrusion extending toward the lower cover.

[0018] The lower cover may have a mating groove configured to accommodate the mating protrusion.

[0019] The size of the groove can be larger than the size of the protrusion.

[0020] A portion of the long side of the upper cover of one of the battery cell holders may contact a portion of the long side of the lower cover of an adjacent battery cell holder.

[0021] At least one of the upper and lower covers of a battery cell holder may have a side that contacts another battery cell holder in the battery cell holder, the side being formed by a plurality of surfaces having different slopes relative to each other.

[0022] Multiple cell holders can be fastened together by close contact between each cell holder in the cell holder, and each cell holder in the cell holder has multiple surfaces with different slopes at the contact side between adjacent cell holders in the cell holder.

[0023] At least one of the top cover and the bottom cover may include a protrusion formed inward from the battery cell holder to prevent the battery cell from separating from the battery cell holder.

[0024] At least one of the top cover and the bottom cover may have a hollow triangular corner. Attached Figure Description

[0025] The following accompanying drawings illustrate embodiments of the present disclosure and are provided to further describe aspects and features of the disclosure together with the detailed description thereof. Therefore, the disclosure should not be construed as limited to the drawings, in which: Figure 1A This is a top perspective view of a cylindrical secondary battery; Figure 1B yes Figure 1A A cross-sectional view of the cylindrical secondary battery shown; Figure 2A This is an exploded view of a battery cell incorporated into a battery cell holder according to an embodiment of the present disclosure; Figure 2B yes Figure 2A The assembly diagram of the battery cell holder shown is shown. Figures 3A to 3D This is a side view of the battery cell holder as viewed from four different directions according to an embodiment of the present disclosure; Figure 4 yes Figures 3A to 3D A top view of the battery cell holder shown; and Figure 5A and Figure 5B This is a diagram of a battery pack according to an embodiment of the present disclosure. Detailed Implementation

[0026] One or more embodiments of this disclosure will be described in more detail herein with reference to the accompanying drawings. Before description, it should be noted that the terms or words used in this disclosure and the appended claims and their equivalents should not be construed as limited to their ordinary or dictionary meanings, but rather are understood to have meanings and concepts consistent with the spirit and scope of this disclosure, based on the principle that the inventor can appropriately define the concept of each term in order to describe his / her own invention in the best possible way. Therefore, since the one or more embodiments described in this disclosure and the constructions or arrangements shown in the drawings are merely examples of this disclosure and do not cover all the technical concepts and aspects of one or more embodiments of this disclosure, it should be understood that one or more suitable changes and modifications may be made at the time of filing this application.

[0027] It will also be understood that if (for example, when) the terms “having / comprising” and / or variations thereof are used herein, it indicates the presence of the stated features, integers, steps, operations, elements, components and / or groups thereof, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0028] In this disclosure, it will be understood that the terms "comprising or variations thereof," "including or variations thereof," or "having or variations thereof" indicate the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Furthermore, the terms "comprising or variations thereof," "including or variations thereof," or "having or variations thereof," or similar terms include or support the terms "consisting of" and "substantially consisting of," indicating the presence of the stated features, integers, steps, operations, elements, and / or components, while other features, integers, steps, operations, elements, components, and / or groups thereof are absent or substantially absent.

[0029] For ease of understanding of this disclosure, the drawings are not drawn to scale, and the dimensions of one or more components may be exaggerated. It should be noted that the same reference numerals are designated as substantially the same components in different embodiments.

[0030] Referring to two compared elements, features, etc., as “identical” means that they are “substantially identical.” Therefore, the phrase “substantially identical” can include what is considered a low deviation in the art, for example, 5% or less. The uniformity of any parameter in a given region can refer to its uniformity from an average perspective (e.g., substantially uniform).

[0031] Although terms such as “first” and / or “second” are used to describe one or more components, these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, unless specifically stated to the contrary, the first component may be referred to as the second component without departing from the spirit and scope of this disclosure.

[0032] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0033] Placing any component "above (or below)" or "on (or under)" a component can mean that any component is positioned to contact the upper (or lower) surface of the component, and other components may be positioned between the component and any component above (or below) the component.

[0034] It will be understood that if (for example, when) a component is referred to as “connected,” “joined,” or “engaged” to another component, it can be directly “connected,” “joined,” or “engaged” to said other component, and it can also be indirectly “connected,” “joined,” or “engaged” to said other component, with other components placed between them.

[0035] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. The use of “may” refers to “one or more embodiments of this disclosure” when describing embodiments of this disclosure. Expressions such as “at least one” and “one or more” modify the entire list of elements when preceding a list of elements, without modifying individual elements within that list.

[0036] Throughout the specification, if (for example, when) “A and / or B” is stated, it refers to A, B, or A and B unless otherwise stated. Furthermore, if (for example, when) “C to D” is stated, it refers to C or greater and D or less unless specifically stated to the contrary.

[0037] When phrases such as “at least one of A, B and C”, “at least one of A, B or C”, “at least one of the group selected from A, B and C” or “at least one of A, B and C” are used to specify a list of elements A, B and C, the phrase may refer to any and all suitable combinations.

[0038] The term “use” may be considered synonymous with the term “utilization”. As used herein, the terms “substantially,” “about,” and similar terms are used as approximations rather than terms of degree and are intended to explain the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0039] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe one or more elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the spirit and scope of this disclosure, the first element, first component, first region, first layer, or first portion discussed below may be referred to as a second element, second component, second region, second layer, or second portion.

[0040] For ease of explanation, when describing the relationship between one element or feature as shown in the accompanying drawings and another element or feature(s), spatial relative terms such as “below,” “under,” “lower,” “above,” and “upper” may be used herein. It will be understood that, in addition to the orientations depicted in the drawings, spatial relative positions are intended to encompass different orientations of the device in use or operation. For example, any element described as “below” or “under” another element if (e.g., when) the device in the drawings is flipped, may subsequently be oriented “above” or “on” another element. Thus, the term “below” can encompass both upward and downward directions.

[0041] The terminology used herein is for the purpose of describing one or more embodiments of this disclosure and is not intended to limit the scope of this disclosure.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have substantially the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that terms (such as those defined in commonly available or commonly used dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formalized sense, unless expressly defined herein.

[0043] Figure 1A This is a top perspective view of a cylindrical secondary battery. Figure 1B yes Figure 1A The cross-sectional view of the cylindrical secondary battery shown.

[0044] Reference Figure 1A and Figure 1B The cylindrical secondary battery may include an electrode assembly 30, a housing 10 therein containing the electrode assembly 30 and an electrolyte, a cover assembly 50 connected to the opening of the housing 10 and sealing the housing 10, and an insulating plate 37 between the electrode assembly 30 and the cover assembly 50 within the housing 10.

[0045] The electrode assembly 30 may include a diaphragm 32, a first electrode 33, and a second electrode 31, wherein the diaphragm 32 is between the first electrode 33 and the second electrode 31, and the diaphragm 32, the first electrode 33, and the second electrode 31 may be wound together in the form of an electrode core.

[0046] The first electrode 33 may include a first substrate and a first active material layer on the first substrate. A first lead connector 35 may extend from a first uncoated portion of the first substrate where the first active material layer is not disposed. The first lead connector 35 may be electrically connected to the cover assembly 50.

[0047] The second electrode 31 may include a second substrate and a second active material layer on the second substrate. A second lead connector 34 may extend from a second uncoated portion of the second substrate where the second active material layer is not disposed. The second lead connector 34 may be electrically connected to the housing 10. The first lead connector 35 and the second lead connector 34 may extend in opposite directions (e.g., facing opposite directions).

[0048] The first electrode 33 can serve as a positive electrode. In such embodiments, for example, the first substrate may include aluminum foil. For example, the first active material layer may include a transition metal oxide. The second electrode 31 can serve as a negative electrode. In such embodiments, for example, the second substrate may include copper foil and / or nickel foil. For example, the second active material layer may include graphite.

[0049] The separator 32 allows the movement of lithium ions (e.g., lithium ion flow) while preventing short circuits between the first electrode 33 and the second electrode 31. For example, the separator 32 may comprise a polyethylene membrane, a polypropylene membrane, and / or a polyethylene-polypropylene membrane.

[0050] The housing 10 can accommodate the electrode assembly 30 and the electrolyte, and can be formed or provided as the external form of the battery together with the cover assembly 50. The housing 10 may include a body portion 12 having a generally cylindrical shape and a bottom portion 11 connected to one side of the body portion 12 (or extending from one side of the body portion 12). A rolled edge portion 43 that has been deformed inward toward the inside of the body portion 12 may be formed in the body portion 12. A crimped portion 45 that has been bent inward toward the inside of the body portion 12 may be located at the end of the body portion 12 on the open side.

[0051] The rolled edge portion 43 can suppress (or reduce the degree or occurrence of) movement of the electrode assembly 30 within the housing 10, and facilitates the connection of the gasket 44 to the cover assembly 50. The crimp portion 45 can securely fix the cover assembly 50 by applying pressure to the edge of the cover assembly 50 via the gasket 44. For example, the housing 10 can be made of nickel-plated iron.

[0052] The cover assembly 50 can seal the housing 10 by being secured to the inside of the crimp portion 45 via a gasket 44. The cover assembly 50 may include an upper cover portion, a safety vent, a lower cover portion, an insulating member, and a subplate, but embodiments of this disclosure are not limited to such examples. The cover assembly 50 may be suitably deformable.

[0053] The top cover portion may be located at the top of the cover assembly 50. The top cover portion may include a terminal portion that protrudes upward and connects to an external circuit. An outlet portion for discharging gas around the terminal portion may be located within the top cover portion.

[0054] The safety vent may be located below the top cover portion. The safety vent may include a downwardly projecting portion that is connected to the subplate and at least one recess around the projecting portion.

[0055] If gas is generated due to overcharging and / or abnormal operation of the secondary battery, the protrusion will deform upwards and separate from the sub-board due to the pressure of the gas. Furthermore, the safety vent can be cut along the notch. The cut safety vent can prevent (or reduce the extent or occurrence of) a secondary battery explosion by venting gas to the outside.

[0056] The lower cover portion may be located below the safety vent. A first opening for exposing the protruding portion of the safety vent and a second opening for venting gas may be located within the lower cover portion. An insulating member may be located between the safety vent and the lower cover portion, thereby insulating the safety vent from the lower cover portion.

[0057] The sub-plate can be located below the lower cover portion. The sub-plate can be fixed to the bottom of the lower cover portion to seal the first opening of the lower cover portion. The protruding portion of the safety vent can be fixed to the sub-plate. The first lead connector 35, already led out from the electrode assembly 30, can be fixed to the sub-plate. Therefore, the upper cover portion, the lower cover portion of the safety vent, and the sub-plate can be electrically connected to the first electrode 33 of the electrode assembly 30.

[0058] An insulating plate 37 may be disposed or provided adjacent to the electrode assembly 30 below the rolled edge portion 43. A connector opening for withdrawing the first lead connector 35 may be provided in the insulating plate 37. A cover assembly 50, which is electrically connected to the first electrode 33 via the first lead connector 35, may face the electrode assembly 30, and the insulating plate 37 is located between the cover assembly 50 and the electrode assembly 30. The cover assembly 50 may maintain or provide a state in which the cover assembly 50 is insulated from the electrode assembly 30 via the insulating plate 37. The cylindrical secondary battery may include another insulating plate 36 for insulation between the electrode assembly 30 and the bottom portion 11 of the housing 10.

[0059] Figure 2A This is an exploded view of a battery cell incorporated into a battery cell holder according to an embodiment of the present disclosure. Figure 2B yes Figure 2A The diagram shows the assembly of the battery cell holder.

[0060] Reference Figure 2A and Figure 2B According to an embodiment of the present disclosure, a battery cell holder 100 includes an upper cover 110 and a lower cover 120. The battery cell holder 100 may mount (or may accommodate) a battery cell 1.

[0061] The top cover 110 surrounds the upper part of the battery cell 1 (e.g., extends around the periphery of the upper part of the battery cell 1) while exposing the first electrode terminal of the battery cell 1.

[0062] The lower cover 120 surrounds the lower portion of the battery cell 1 (e.g., extends around the periphery of the lower portion of the battery cell 1), while exposing the second electrode terminal of the battery cell 1. The lower cover 120 is attached to the upper cover 110.

[0063] The upper cover 110 may include a coupling protrusion 111 and a coupling groove 112, and the lower cover 120 may include a coupling protrusion 121 and a coupling groove 122, for example as... Figure 2B The diagram shows the upper and lower covers joined together. In this embodiment, the connecting protrusions 111 and 121 can both be hook-shaped.

[0064] The specific construction of a battery cell holder according to an embodiment of the present disclosure will now be described with reference to the accompanying drawings.

[0065] Figures 3A to 3D When viewed from four different directions Figure 2A and Figure 2B The side view of the battery cell holder 100 shown.

[0066] Reference Figure 3A and Figure 3C When viewed from the side, some of the separating sides of the upper cover 110 and lower cover 120 that are in contact with each other can be formed as diagonal lines (e.g., they can extend in the diagonal direction). Figure 3A In the middle, the dividing side A is formed as a diagonal line. Figure 3C The shown with Figure 3A In the faces shown, the separating side A' is formed as a diagonal line in a direction opposite to (e.g., perpendicularly opposite or mirrored) the diagonal line in the separating side A.

[0067] Figure 3B and Figure 3D It shows the relationship with Figure 3A and Figure 3C The faces shown are adjacent to each other. Figure 3B and Figure 3D As can be seen, when the battery cell holder 100 is viewed from the side, the separators B and B', other than separators A and A', are formed as horizontal lines instead of diagonal lines. Figure 3B The dividing side B shown has a greater degree of separation than the dividing sides A and A', which are formed by diagonal lines. Figure 3D The height of the lower dividing side B' shown in the diagram. Figure 3B The image shows the long side of the upper cover 110 and the short side of the lower cover 120. Figure 3D The image shows the short side of the upper cover 110 and the long side of the lower cover 120.

[0068] The joint between the upper cover 110 and the lower cover 120 is formed in Figure 3B and Figure 3D Each of the two sides B and B' is separated by a horizontal line. Figure 3B In the middle, the joint between the upper cover 110 and the lower cover 120 is formed at the partition side B, and the upper cover 110 includes a connecting protrusion 111 extending toward the lower cover 120 at the joint between the upper cover 110 and the lower cover 120, and the lower cover 120 has a connecting groove 122 corresponding to the connecting protrusion 111 at the joint between the upper cover 110 and the lower cover 120 for receiving the connecting protrusion 111. Figure 3D In the middle, the joint between the upper cover 110 and the lower cover 120 is formed at the partition side B', and the lower cover 120 includes a joint protrusion 121 at the joint between the upper cover 110 and the lower cover 120, and the upper cover 110 has a joint groove 112 corresponding to the joint protrusion 121 at the joint between the upper cover 110 and the lower cover 120.

[0069] In embodiments, the dimensions of the mating grooves 112, 122 in the corresponding upper cover 110 and lower cover 120 can be larger than the dimensions of the corresponding mating protrusions 121, 111. For example, because the mating grooves 112, 122 are larger than the mating protrusions 121, 111, the upper cover 110 and lower cover 120 can be joined together with some slack (or gap) rather than tightly. Therefore, the battery cell holder can correct for (or can accommodate) external dispersion that occurs during the manufacturing process of the battery cell. For example, if the battery cell is manufactured slightly too tall due to an anomaly in its manufacturing process, and the battery cell holder is manufactured such that its upper and lower covers are tightly joined, the upper and lower covers may not be able to be joined to the battery cell, making it difficult to install the battery cell in the battery cell holder. However, according to the battery cell holder 100 of the embodiments of the present disclosure, even if the height of the battery cell is slightly larger, the battery cell can still be installed in the battery cell holder 100 according to the embodiments of the present disclosure because the upper cover 110 and lower cover 120 can be joined together with some slack.

[0070] The battery cell holder 100 according to an embodiment of the present disclosure has a configuration in which some of the separating sides of the upper cover 110 and the lower cover 120 that contact each other are formed as diagonal lines. Therefore, each battery cell holder can have complementary support structures, which will be described in more detail later in conjunction with a battery pack according to an embodiment of the present disclosure.

[0071] Figure 4 yes Figures 3A to 3D The top view of the battery cell holder shown.

[0072] Figure 4The battery cell holder 100 is shown as viewed from above. Specifically, Figure 4 The top cover 110 is shown as viewed from above. The bottom cover 120 is the same or substantially similar when viewed from below.

[0073] In one embodiment, the upper cover 110 (or lower cover 120) may have an inner diameter larger than the maximum outer diameter of the battery cell. This allows the battery cell holder 100 to accommodate the battery cell.

[0074] In an embodiment, the battery cell holder 100 may include one or more protrusions 113 formed therein to prevent the battery cell from separating from the upper part of the upper cover 110 (or the lower part of the lower cover 120). Figure 4 An embodiment is shown in which four protrusions 113 are formed inward from the battery cell holder to prevent the separation of the battery cells.

[0075] In an embodiment, the upper cover 110 (or lower cover 120) may have hollow triangular corners 114 when viewed from above (or below). The hollowness of the corners 114 prevents or reduces shrinkage when the upper cover 110 (or lower cover 120) is formed by injection molding. Furthermore, because the corners 114 are hollow, they can also absorb impacts in the event of an impact to the battery pack.

[0076] like Figure 4 As shown, when viewed from above, the top cover 110 may have a side that contacts another battery cell holder, for example, a side with multiple straight lines having different slopes. Figure 4 Side C, which is in contact with another battery cell holder and is formed by three straight lines (or surfaces) with different slopes, is shown. Similarly, when viewed from below, the lower cover 120 may have a side that is in contact with another battery cell holder and is formed by multiple straight lines with different slopes.

[0077] The battery cell holder 100 according to an embodiment of the present disclosure has a side that contacts other battery cell holders, and said sides are formed as multiple straight lines with different slopes to maintain a strong mutual clamping force between the battery cell holders constituting the battery pack. A detailed description of the battery pack according to an embodiment of the present disclosure will be given later.

[0078] Figure 5A and Figure 5B This is a diagram of a battery pack according to an embodiment of the present disclosure.

[0079] Figure 5A and Figure 5B A battery pack is shown formed by a combination of multiple battery cell holders 100 equipped with (or housing) multiple battery cells 1.

[0080] In the battery pack according to an embodiment of the present disclosure, reference is made to Figure 5A In region D, the battery cell holders can be joined together in such a state that, due to the diagonal shape of the separator side, a portion of the long side of each upper cover 110 contacts a portion of the long side of the associated (or corresponding) lower cover 120. As described above, the joint between the upper cover 110 and the lower cover 120 at the separator side is formed as a horizontal line adjacent to the diagonal separator side, and the lower portion of the long side of the upper cover 110 supports the joint between the upper cover 110 and the lower cover 120. Therefore, the plurality of battery cell holders 100 can have complementary support structures, providing enhanced durability of the battery pack.

[0081] In the battery pack according to embodiments of the present disclosure, such as from Figure 5A As can be seen from the contact side between the top covers 110, multiple battery cell holders 100 can be fastened together by the close contact of multiple straight lines with different slopes on the contact side between the battery cell holders. In this way, the battery pack can maintain a strong mutual fastening force between the battery cell holders 100 through multiple straight lines with different slopes on each side of each battery cell holder 100 in the arrangement of multiple battery cells.

[0082] As will be apparent from the above description, embodiments of this disclosure provide a battery pack formed by connecting a plurality of cell holders, each cell holder capable of housing (or configured to accommodate) a battery cell.

[0083] According to embodiments of this disclosure, the durability of the battery pack can be improved by forming some of the partition sides that contact the upper and lower covers as diagonal lines and allowing each cell holder to have a complementary support structure.

[0084] According to embodiments of this disclosure, because the upper and lower covers are joined together with some looseness, the cell holder can correct for external dispersion that may occur during the manufacturing process of the cell.

[0085] According to embodiments of this disclosure, because the contact sides between the battery cell holder and another battery cell holder are formed as multiple straight lines with different slopes, a strong mutual clamping force can be maintained between the battery cell holders constituting the battery pack.

Claims

1. A battery cell holder for accommodating battery cells therein, the battery cell holder comprising: The top cover is configured to extend around the upper part of the battery cell while exposing the first electrode terminal of the battery cell. as well as The lower cover is configured to extend around the lower portion of the battery cell while exposing the second electrode terminals of the battery cell. The lower cover and the upper cover are joined together. The upper cover and the lower cover extend obliquely to each other on a pair of separating sides that come into contact when the upper cover and the lower cover are joined together.

2. The battery cell holder according to claim 1, wherein, The upper cover and the lower cover extend horizontally on another pair of separating sides that come into contact with each other when the upper cover and the lower cover are joined together.

3. The battery cell holder according to claim 2, wherein, At least some of the separating sides of the upper cover and the lower cover extend horizontally.

4. The battery cell holder according to claim 3, wherein, The upper cover includes a connecting protrusion extending toward the lower cover.

5. The battery cell holder according to claim 4, wherein, The lower cover has a mating groove configured to accommodate the mating protrusion.

6. The battery cell holder according to claim 5, wherein, The size of the mating groove is larger than the size of the mating protrusion.

7. The battery cell holder according to claim 1, wherein, At least one of the upper cover and the lower cover has a transverse side formed by surfaces with different slopes relative to each other.

8. The battery cell holder according to claim 1, wherein, At least one of the upper cover and the lower cover includes an inwardly formed protrusion to prevent the battery cell from separating from at least one of the upper cover and the lower cover.

9. The battery cell holder according to claim 1, wherein, At least one of the upper cover and the lower cover has a hollow triangular corner.

10. A battery pack, the battery pack comprising: Multiple battery cells; as well as A plurality of battery cell holders, each accommodating a plurality of battery cells, each of the plurality of battery cell holders comprising: A top cover extends around the upper portion of a corresponding battery cell among the plurality of battery cells, while exposing a first electrode terminal passing through the top cover; and A lower cover extends around the lower portion of a corresponding battery cell among the plurality of battery cells, and exposes a second electrode terminal through the lower cover; the lower cover and the upper cover are joined together. The upper cover and the lower cover extend obliquely to each other on a pair of separating sides that come into contact when the upper cover and the lower cover are joined together.

11. The battery pack according to claim 10, wherein, The upper cover and the lower cover extend horizontally on another pair of separating sides that come into contact with each other when the upper cover and the lower cover are joined together.

12. The battery pack according to claim 11, wherein, At least some of the separating sides of the upper cover and the lower cover extend horizontally.

13. The battery pack according to claim 12, wherein, The upper cover includes a connecting protrusion extending toward the lower cover.

14. The battery pack according to claim 13, wherein, The lower cover has a mating groove configured to accommodate the mating protrusion.

15. The battery pack according to claim 14, wherein, The size of the mating groove is larger than the size of the mating protrusion.

16. The battery pack according to claim 10, wherein, A portion of the long side of the upper cover of one of the plurality of battery cell holders contacts a portion of the long side of the lower cover of an adjacent battery cell holder among the plurality of battery cell holders.

17. The battery pack according to claim 10, wherein, At least one of the upper and lower covers of one of the plurality of battery cell holders has a side that contacts another of the plurality of battery cell holders, the side being formed by a plurality of surfaces having different slopes relative to each other.

18. The battery pack according to claim 17, wherein, The plurality of battery cell holders are fastened together by close contact of each of the plurality of battery cell holders, and each of the plurality of battery cell holders has multiple surfaces with different slopes at the contact side between adjacent battery cell holders in the plurality of battery cell holders.

19. The battery pack according to claim 10, wherein, At least one of the upper cover and the lower cover includes an inwardly formed protrusion from the battery cell holder to prevent the battery cell from separating from the battery cell holder.

20. The battery pack according to claim 10, wherein, At least one of the upper cover and the lower cover has a hollow triangular corner.

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