Battery shell and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery shell and a battery, a shell main body comprises a bottom wall and a peripheral side wall, the bottom wall and the peripheral side wall are fixed and enclose to form an accommodating space, and the accommodating space is used for placing a pole piece; the end cover and the shell body are fixed in the circumferential direction and used for sealing the containing space, the end cover is provided with a containing groove and a tab through hole, the tab through hole is formed in the bottom wall of the containing groove and used for allowing a tab connected with the pole piece to stretch out of the containing space, the tab can be arranged in the containing groove in a bent mode, and the bottom wall of the containing groove is used for supporting the bent tab. Therefore, the part, extending out of the accommodating space, of the tab can be bent towards the end surface of the tab through hole, so that the part, extending out of the accommodating space, of the tab can be positioned in the accommodating groove, the space utilization rate of the battery shell is further improved, and the tab can be supported and protected.

Description

Technical Field

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

[0002] Generally, a power battery includes a battery casing and a battery cell assembly installed inside the battery casing. The battery casing is divided into a main shell and a cover plate. The battery cell assembly is placed in the main shell, and the electrode can extend out of the main shell and electrically connect to the electrode installed on the cover plate.

[0003] In existing battery structures, the cover plate requires a clearance for the portion of the tab that extends beyond the main housing. This makes the cover plate and the entire battery structure difficult to compress during design. Furthermore, the tab within the clearance loses support and is connected only to the terminal post. When the battery vibrates due to external forces, the terminal post squeezes or pulls on the tab, easily damaging it.

[0004] Therefore, there is an urgent need for a battery housing and a battery to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a battery housing and a battery, which can improve the utilization rate of the battery housing and provide support and protection for the tabs.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Battery housing, comprising:

[0008] The shell body includes a bottom wall and a peripheral side wall, the bottom wall and the peripheral side wall are fixed to form an accommodating space, and the accommodating space is used to place the pole piece;

[0009] The end cover is fixed to the shell body along the circumferential direction and is used to close the above-mentioned accommodating space. The end cover is provided with a receiving groove and a pole ear through hole. The pole ear through hole is provided on the bottom wall of the above-mentioned receiving groove. The pole ear through hole is used to allow the pole ear connected to the above-mentioned pole piece to extend out of the above-mentioned accommodating space. The above-mentioned pole ear can be bent and arranged in the above-mentioned receiving groove, and the bottom wall of the above-mentioned receiving groove is used to support the bent pole ear.

[0010] As a preferred technical solution for the battery housing, in the first direction, the length A of the tab through-hole satisfies C+2≤A≤K / 3, where C is the length of the tab and K is the length of the end cap.

[0011] As a preferred technical solution of the battery housing, the tab through-hole is rectangular or waist-shaped, and the long side of the radial cross-section of the tab through-hole is parallel to the first direction.

[0012] As a preferred technical solution of the battery housing, the end cover is provided with a liquid injection port, and the liquid injection port can selectively connect the indoor and outdoor environments of the accommodating space.

[0013] As a preferred technical solution of the battery housing, the end cover is provided with a vent hole, and an explosion-proof valve is installed at the vent hole.

[0014] As a preferred technical solution of the battery housing, a reinforcing rib is provided in the vent hole, and the reinforcing rib is used to support the explosion-proof valve.

[0015] As a preferred technical solution of the above-mentioned battery housing, the width of the above-mentioned reinforcing rib is 0.3mm-2mm.

[0016] As a preferred technical solution of the battery housing, a chamfer is provided at a connection position between the end cover and the peripheral side wall along the circumferential direction.

[0017] As a preferred technical solution of the battery housing, a lower plastic is provided in the accommodating space, the lower plastic is adhered to the end cover, and at least a portion of the lower plastic is sandwiched between the chamfered inner peripheral wall and the pole piece.

[0018] A battery is also provided, comprising the above-mentioned electrode piece and the above-mentioned battery shell, wherein the above-mentioned electrode piece is placed in the above-mentioned battery shell, and the above-mentioned electrode tab can extend out of the above-mentioned accommodation space from the above-mentioned electrode tab through hole.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a battery case, comprising a case body and an end cap. The case body comprises a bottom wall and peripheral side walls, which are fixed to form a storage space for accommodating a pole piece. The end cap is fixed to the case body along the circumferential direction and is used to seal the storage space. The end cap is provided with a receiving groove and a tab through hole. The tab through hole is provided in the bottom wall of the receiving groove. The tab through hole is used to allow a tab connected to the pole piece to extend into the storage space. The tab can be bent and arranged in the receiving groove, and the bottom wall of the receiving groove is used to support the bent tab.

[0021] The bottom wall and the peripheral side walls of the shell body are both rectangular and assembled to form an accommodating space. The accommodating space is a rectangular parallelepiped. A plurality of positive electrode sheets and a plurality of negative electrode sheets are inserted into the accommodating space. The peripheral edge of the end cap is connected to the peripheral side wall of the shell body, so that the accommodating space forms a relatively sealed space area. A storage groove is provided on the side of the end cap facing away from the accommodating space. A tab through-hole is formed in the bottom wall of the storage groove and penetrates the end cap, connecting the indoor and outdoor environments of the accommodating space. Two storage grooves are spaced apart along a first direction. The tab of the positive electrode sheet extends into the accommodating space from the tab through-hole of one of the storage grooves, and the tab of the negative electrode sheet extends into the accommodating space from the tab through-hole of the other storage groove. The tabs of the positive electrode sheet and the negative electrode sheet can both be bent, that is, the portion of the tab extending from the accommodating space can be bent toward the end surface of the tab through-hole. In this way, the portion of the tab extending from the accommodating space can be located within the storage groove, further improving the space utilization of the battery shell. The bottom wall of the receiving groove provides support and protection for the tabs outside the accommodating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a battery housing provided by an embodiment of the present utility model;

[0024] Figure 2 This is a top view of a battery housing provided by an embodiment of the present utility model;

[0025] Figure 3 It is a schematic diagram of the assembly of the battery housing and the tab provided in an embodiment of the present utility model.

[0026] In the picture:

[0027] X, first direction; Y, second direction;

[0028] 10. Shell body; 11. Chamfer;

[0029] 20. End cap; 21. Storage tank; 211. Bottom wall of storage tank; 22. Tab through hole; 23. Liquid injection port; 24. Ventilation hole; 25. Reinforcement rib;

[0030] 31. Extreme ears;

[0031] 40. Explosion-proof valve; 50. Lower plastic; 60. Upper plastic. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] like Figures 1 to 3 As shown, the present invention provides a battery case, including a case body 10 and an end cover 20. The case body 10 includes a bottom wall and peripheral side walls, which are fixed to form a housing space for placing electrode sheets. The end cover 20 is fixed to the case body 10 along the circumferential direction to seal the housing space. The end cover 20 defines a receiving groove 21 and a tab through-hole 22. The tab through-hole 22 is defined in the bottom wall 211 of the receiving groove. The tab through-hole 22 is used to allow a tab 31 connected to the electrode sheet to extend out of the housing space. The tab 31 can be bent and disposed in the receiving groove 21, and the bottom wall 211 of the receiving groove is used to support the bent tab 31.

[0037] Exemplarily, the bottom wall and the peripheral side walls of the shell body 10 are both rectangular, and are assembled into an accommodating space. The accommodating space is a rectangular parallelepiped, and a plurality of positive electrode sheets and a plurality of negative electrode sheets are inserted in the accommodating space. The peripheral edge of the end cover 20 is connected to the peripheral side wall of the shell body 10, so that the accommodating space forms a relatively sealed space area. A receiving groove 21 is provided on the side of the end cover 20 facing away from the accommodating space. The pole ear through hole 22 is formed in the bottom wall 211 of the receiving groove and penetrates the end cover 20, connecting the indoor and outdoor environments of the accommodating space. Along the first direction X, the end cover 20 is provided with two receiving grooves 21 at intervals. The pole ear 31 of the positive electrode sheet extends out of the accommodating space from the pole ear through hole 22 of one of the receiving grooves 21, and the pole ear 31 of the negative electrode sheet extends out of the accommodating space from the pole ear through hole 22 of the other receiving groove 21. The pole ear 31 of the positive electrode sheet and the pole ear 31 of the negative electrode sheet can both be bent, that is, the part of the pole ear 31 extending out of the accommodating space can be bent toward the end face of the pole ear through hole 22, so that the part of the pole ear 31 extending out of the accommodating space can be located in the receiving groove 21, further improving the space utilization rate of the battery shell. The bottom wall 211 of the receiving groove provides support and protection for the tab 31 outside the accommodating space.

[0038] Furthermore, at least one tab through hole 22 is formed on the bottom wall 211 of each receiving slot.

[0039] Optionally, in the first direction X, the length A of the tab through-hole 22 satisfies C+2≤A≤K / 3, where C is the length of the tab 31 and K is the length of the end cap 20. In this arrangement, C+2≤A can prevent the tab 31 from being squeezed by the opposite side walls of the tab through-hole 22 in the first direction X, thereby damaging the tab 31 and facilitating insertion of the tab 31 into the tab through-hole 22; A≤K / 3 can also prevent an excessively large opening from being formed in the end cap 20, thereby affecting the overall structural strength of the battery housing.

[0040] Optionally, the tab through-hole 22 is rectangular or waist-shaped, and the long side of the radial cross-section of the tab through-hole 22 is parallel to the first direction X. Specifically, the long side of the radial cross-section of the tab through-hole 22 is in the first direction X, and the two long sides are spaced apart in the second direction Y with a spacing B such that B<A. The second direction Y is perpendicular to the first direction X.

[0041] Optionally, the end cap 20 is provided with a liquid injection port 23 that can selectively connect the indoor and outdoor environments of the accommodating space. In this way, electrolyte can be introduced into the accommodating space through the liquid injection port 23, and the liquid injection port 23 can be selectively closed or opened to prevent electrolyte leakage and maintain the relative sealing of the accommodating space.

[0042] Specifically, the liquid injection port 23 is equipped with a valve body, which can control the opening or closing of the liquid injection port 23 .

[0043] When a battery malfunctions, a large amount of gas is generated in the storage space, causing the internal pressure of the storage space to increase sharply. At this time, if the large amount of gas generated is not discharged, the battery will explode, causing a safety accident. To this end, the end cap 20 is provided with a vent 24, and an explosion-proof valve 40 is installed at the vent 24. During normal use, the explosion-proof valve 40 is in a normally closed state, the vent 24 is closed, and the indoor and outdoor environments of the storage space cannot be connected through the vent 24. When the indoor pressure of the storage space exceeds the preset pressure threshold of the explosion-proof valve 40, the explosion-proof valve 40 opens, allowing the indoor gas of the storage space to be discharged to the outdoor environment through the vent 24, thereby achieving rapid pressure relief of the storage space. When the indoor pressure of the storage space returns to a pressure threshold lower than the pressure threshold of the explosion-proof valve 40, the explosion-proof valve 40 closes again.

[0044] Optionally, a reinforcing rib 25 is provided in the vent hole 24, and the reinforcing rib 25 is used to support the explosion-proof valve 40. In this way, the explosion-proof valve 40 is supported by the reinforcing rib 25, and the ability of the explosion-proof valve 40 to resist deformation can be improved.

[0045] For example, the reinforcing ribs 25 are arranged in an X shape, and the intersection of the reinforcing ribs 25 is located at the center of the explosion-proof valve 40, which can enhance the strength of the central area of ​​the explosion-proof valve 40. The reinforcing ribs 25 can change the direction of the force applied by the airflow on the explosion-proof valve 40, so that the explosion-proof valve 40 is more evenly stressed, thereby extending the service life of the explosion-proof valve 40.

[0046] Optionally, the notch of the explosion-proof valve 40 may face the outside of the accommodating space.

[0047] Furthermore, if the thickness of the reinforcing rib 25 is too small, its strength is relatively weak, but if the thickness of the reinforcing rib 25 is too large, it affects the thickness design of the battery shell. Therefore, through experiments, it is found that the width of the reinforcing rib 25 is 0.3mm-2mm.

[0048] Optionally, the connection between the end cap 20 and the peripheral side wall is provided with a chamfer 11 along the circumferential direction. Thus, by providing the chamfer 11, the peripheral edge of the battery housing is not sharp, so as not to cut the user; it is convenient for parts assembly; and it is conducive to stress release during material heat treatment. The chamfer 11 is not easy to crack, which can reduce deformation and solve the problem of stress concentration.

[0049] Exemplarily, the chamfer 11 is a circular arc angle.

[0050] Optionally, a lower plastic 50 is disposed within the accommodation space. The lower plastic 50 is attached to the end cap 20, and at least a portion of the lower plastic 50 is sandwiched between the inner circumferential wall of the chamfer 11 and the electrode. Specifically, the lower plastic 50 is elastically deformable to cushion the collision between the electrode and the battery housing, preventing the chamfer 11 from colliding with the electrode and causing damage to the electrode.

[0051] Optionally, an upper plastic 60 is provided on the side of the end cover 20 facing away from the accommodating space. The upper plastic 60 is laid on the peripheral side of the receiving groove 21.

[0052] A battery is also provided, comprising a pole piece and the above-mentioned battery housing, wherein the pole piece is placed in the battery housing, and the pole tab 31 can extend out of the accommodation space from the pole tab through hole 22 .

[0053] Furthermore, the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery housing, characterized in that: include: A shell body (10), the shell body (10) comprising a bottom wall and a peripheral side wall, the bottom wall and the peripheral side wall being fixed to form an accommodating space, the accommodating space being used to place a pole piece; An end cover (20) is fixed to the shell body (10) along the circumferential direction and is used to close the accommodating space. The end cover (20) is provided with a receiving groove (21) and a pole ear through hole (22). The pole ear through hole (22) is provided on the bottom wall (211) of the receiving groove. The pole ear through hole (22) is used to allow the pole ear (31) connected to the pole piece to extend out of the accommodating space. The pole ear (31) can be bent and arranged in the receiving groove (21), and the bottom wall (211) of the receiving groove is used to support the bent pole ear (31).

2. The battery case according to claim 1, wherein: In the first direction (X), the length A of the tab through hole (22) satisfies C+2≤A≤K / 3, where C is the length of the tab (31) and K is the length of the end cover (20).

3. The battery case according to claim 2, characterized in that The tab through hole (22) is rectangular or waist-shaped, and the long side of the radial cross section of the tab through hole (22) is parallel to the first direction (X).

4. The battery case according to claim 1, wherein: The end cover (20) is provided with a liquid injection port (23), and the liquid injection port (23) can selectively connect the indoor and outdoor environments of the accommodating space.

5. The battery case according to claim 1, wherein: The end cover (20) is provided with a vent hole (24), and an explosion-proof valve (40) is installed at the vent hole (24).

6. The battery case according to claim 5, characterized in that A reinforcing rib (25) is provided in the vent hole (24), and the reinforcing rib (25) is used to support the explosion-proof valve (40).

7. The battery case according to claim 6, characterized in that The width of the reinforcing rib (25) is 0.3mm-2mm.

8. The battery case according to claim 1, wherein: A chamfer (11) is provided along the circumferential direction at the connection position between the end cover (20) and the peripheral side wall.

9. The battery case according to claim 8, characterized in that A lower plastic (50) is provided in the accommodating space, the lower plastic (50) is adhered to the end cover (20), and at least a portion of the lower plastic (50) is sandwiched between the inner peripheral wall of the chamfer (11) and the pole piece.

10. A battery, characterized in that The battery comprises the pole piece and the battery housing according to any one of claims 1 to 9, wherein the pole piece is placed in the battery housing, and the pole tab (31) can extend out of the accommodating space from the pole tab through hole (22).

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