Battery shell and battery

Abstract

The utility model provides a battery shell and a battery, belonging to the technical field of batteries, comprising a fixedly arranged positive electrode shell and a negative electrode shell, wherein the positive electrode shell and the negative electrode shell are both provided with a receiving groove with an opening at one end, and when the positive electrode shell and the negative electrode shell are fixed, the mounting grooves on the positive electrode shell and the negative electrode shell form a receiving cavity for mounting a battery core, and the positive electrode shell and the negative electrode shell are insulated, and the positive electrode shell and the negative electrode shell are respectively electrically connected to the positive electrode and the negative electrode of the battery core; the advantage is that the positive and negative electrodes of the battery core are respectively directly electrically connected to the positive electrode shell and the negative electrode shell of the battery shell, thereby eliminating the pole column structure in the battery structure, reducing the internal resistance of the battery, and also reducing the internal space required for the battery core, thereby increasing the energy density of the battery.

Description

Technical Field

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

[0002] Sodium-ion batteries have many advantages such as low cost, high energy density, excellent low-temperature performance, no memory effect, excellent cycle performance, and high charge and discharge efficiency. They have developed rapidly in the fields of two-wheeled vehicles, energy storage, and low-end digital products, and are expected to occupy a large market share.

[0003] In the existing sodium-ion battery manufacturing process, both the positive and negative current collectors need to be pre-welded with pole tabs or connecting pieces, and then led out to the outer pole through the cover plate. This structure increases the entire process flow, increases the battery's internal resistance, and also occupies a large amount of internal battery space, reducing the battery's energy density. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a battery structure without poles.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a battery shell, comprising a fixed positive electrode shell and a negative electrode shell, wherein the positive electrode shell and the negative electrode shell are both provided with a receiving groove with an opening at one end, and when the positive electrode shell and the negative electrode shell are fixed, the mounting grooves on the positive electrode shell and the negative electrode shell form a receiving cavity for mounting a battery core, and the positive electrode shell and the negative electrode shell are insulated, and the positive electrode shell and the negative electrode shell are electrically connected to the positive electrode and the negative electrode of the battery core respectively.

[0006] In the above-mentioned battery case, an insulating member is provided between the positive electrode case and the negative electrode case, so that the positive electrode case and the negative electrode case are insulated from each other.

[0007] In the above-mentioned battery shell, the positive electrode shell and the negative electrode shell do not contact each other, the insulating member includes a connecting boss arranged on the outer wall of the opening of one of the negative electrode shell and the positive electrode shell, and a connecting buckle strip is arranged on the other, the connecting buckle strip covers the connecting boss, and a gap is arranged between the connecting buckle strip and the connecting boss to form an insulating cavity, and an insulating part is arranged in the insulating cavity.

[0008] In the above-mentioned battery shell, the insulating part includes insulating glue, the insulating glue is filled in the insulating cavity, and the insulating glue is respectively bonded to the connecting boss and the connecting buckle strip.

[0009] In the above-mentioned battery shell, an insulating spacer is also provided in the insulating glue.

[0010] In the above-mentioned battery shell, the connecting buckle strip includes a first connecting strip arranged in a horizontal direction, and second connecting strips arranged in a vertical direction are integrally arranged at both ends of the first connecting strip, wherein one of the second connecting strips is integrally arranged with one of the negative electrode shell and the positive electrode shell, and all the second connecting strips are not in contact with each other.

[0011] In the above-mentioned battery shell, a mounting opening is provided on the positive electrode shell or the negative electrode shell, the mounting opening is communicated with the accommodating cavity, and a shell cover is encapsulated and provided at the mounting opening.

[0012] A battery comprises the above-mentioned battery shell.

[0013] In the above-mentioned battery, it also includes a battery core, which includes a first battery core and a second battery core that are stacked, and both ends of the first battery core and the second battery core are provided with bent foils, and the bent foil on the first battery core and the bent foil on the second battery core are arranged in a mirror image, and when the battery core is placed in the accommodating cavity, the bent foils at both ends of the battery core are fixedly connected to the battery shell.

[0014] In the above-mentioned battery, the battery shell is fixed to the bent foil by welding.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) The positive and negative electrodes of the battery core are directly electrically connected to the positive electrode shell and the negative electrode shell of the battery shell, respectively, eliminating the pole structure in the battery structure, reducing the internal resistance of the battery, and also reducing the internal space required for the battery core, thereby increasing the energy density of the battery;

[0017] (2) The positive electrode shell and the negative electrode shell can also be used as the positive electrode column and the negative electrode column respectively, so that the battery shell integrates the function of the electrode column.

[0018] (3) When the positive electrode shell or the negative electrode shell is subjected to an external lateral force, the connecting boss can also play a certain barrier role on the insulating glue, preventing the movement of the insulating glue and ensuring the bonding effect between the insulating glue and the negative electrode shell and the positive electrode shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery shell.

[0020] Figure 2 It is a schematic diagram of the structure when the shell cover is separated from the battery shell;

[0021] Figure 3 is a partial cross-sectional schematic diagram of a battery shell;

[0022] Figure 4It is a schematic diagram of the three-dimensional structure of the battery core;

[0023] Figure 5 It is a schematic diagram of the explosion structure of the battery core.

[0024] In the figure, there are a battery case 100, a positive electrode case 101, a negative electrode case 102, a connecting boss 103, a connecting buckle strip 104, a first connecting strip 105, a second connecting strip 106, an insulating glue 107, an insulating spacer 108, a case cover 109, a battery cell 200, a first cell 201, a second cell 202, and a bent foil 203. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] like Figure 1-Figure 3 As shown, a battery shell 100 includes a positive electrode shell 101 and a negative electrode shell 102 which are fixedly arranged. The positive electrode shell 101 and the negative electrode shell 102 are both provided with a receiving groove with an opening at one end. When the positive electrode shell 101 and the negative electrode shell 102 are fixed, the mounting grooves on the positive electrode shell 101 and the negative electrode shell 102 form a receiving cavity for mounting a battery core 200, and the positive electrode shell 101 and the negative electrode shell 102 are insulated from each other. The positive electrode shell 101 and the negative electrode shell 102 are electrically connected to the positive electrode and the negative electrode of the battery core 200, respectively.

[0028] In this embodiment, the positive and negative electrodes of the battery core 200 are directly electrically connected to the positive electrode shell 101 and the negative electrode shell 102 of the battery shell 100, respectively, eliminating the pole structure in the battery structure, reducing the internal resistance of the battery, and also reducing the internal space required for the battery core 200, thereby increasing the energy density of the battery; and the positive electrode shell 101 and the negative electrode shell 102 can also be used as the positive pole column and the negative pole column, respectively, so that the battery shell 100 integrates the function of the pole.

[0029] Further preferably, an insulating member is disposed between the positive electrode case 101 and the negative electrode case 102 , so that the positive electrode case 101 and the negative electrode case 102 are insulated from each other.

[0030] Specifically, the positive electrode shell 101 and the negative electrode shell 102 do not contact each other, and the insulating member includes a connecting boss 103 arranged on the outer wall of the opening of one of the negative electrode shell 102 and the positive electrode shell 101, and a connecting buckle strip 104 is arranged on the other, and the connecting buckle strip 104 covers the connecting boss 103, and a gap is arranged between the connecting buckle strip 104 and the connecting boss 103 to form an insulating cavity, and an insulating part is arranged in the insulating cavity.

[0031] In this embodiment, while considering the insulating connection between the negative electrode shell 102 and the positive electrode shell 101 bracket, the stable connection between the positive electrode shell 101 and the negative electrode shell 102 must also be considered. Therefore, in the present application, a connecting boss 103 is provided on the outer wall of the opening of one of the negative electrode shell 102 and the positive electrode shell 101, and a connecting buckle strip 104 is provided on the other. The setting of the connecting buckle strip 104 and the connecting boss 103 can increase the contact area between the insulating part and the negative electrode shell 102 and the positive electrode shell 101, and increase the connection stability between the negative electrode shell 102 and the positive electrode shell 101.

[0032] Specifically, the insulating part includes insulating glue 107 , the insulating glue 107 is filled in the insulating cavity, and the insulating glue 107 is bonded to the connecting boss 103 and the connecting buckle strip 104 respectively.

[0033] In the present embodiment, the negative electrode shell 102 and the positive electrode shell 101 are bonded and fixed by the insulating glue 107, and the setting of the connecting boss 103 and the connecting buckle strip 104 forms a labyrinth groove between the connecting boss 103 and the connecting buckle strip 104, and the contact area between the insulating glue 107 and the negative electrode shell 102 and the positive electrode shell 101 is increased without changing the installation space of the insulating glue 107; and after the connecting buckle strip 104 is covered on the connecting boss 103, the connecting boss 103 divides the space in the connecting buckle strip 104 into two interconnected areas, each of which is filled with the insulating glue 107. When the positive electrode shell 101 or the negative electrode shell 102 is subjected to an external lateral force, the connecting boss 103 can also play a certain barrier role on the insulating glue 107, prevent the movement of the insulating glue 107, and ensure the bonding effect between the insulating glue 107 and the negative electrode shell 102 and the positive electrode shell 101.

[0034] It is worth mentioning that, in order to ensure the insulation effect between the positive electrode shell 101 and the negative electrode shell 102 , an insulating spacer 108 is further provided in the insulating glue 107 .

[0035] Specifically, the connecting buckle strip 104 includes a first connecting strip 105 arranged in a horizontal direction, and second connecting strips 106 arranged in a vertical direction are integrally arranged at both ends of the first connecting strip 105, wherein one of the second connecting strips 106 is integrally arranged with one of the negative electrode shell 102 and the positive electrode shell 101, and all the second connecting strips 106 do not contact each other.

[0036] In this embodiment, the first connecting bar 105 is located above the connecting boss 103 and does not contact the connecting boss 103, and one of the two second connecting bars 106 is integrally provided with one of the negative electrode shell 102 and the positive electrode shell 101, and the two second connecting bars 106 are located on both sides of the first connecting bar 105, and none of the second connecting bars 106 is in contact with one another.

[0037] Specifically, the opening wall of the negative electrode case 102 or the positive electrode case 101 is flush with the side surface of the connecting boss 103 , and the opening wall of the other is flush with the side surface of the second connecting bar 106 connected thereto.

[0038] Further preferably, an installation opening is provided on the positive electrode shell 101 or the negative electrode shell 102, and the installation opening is connected to the accommodating cavity, and a shell cover 109 is encapsulated at the installation opening. When the shell cover 109 is opened, the installation opening connected to the accommodating cavity is exposed, and the battery cell 200 is installed into the accommodating cavity along the installation opening, and the positive and negative electrodes of the battery cell 200 are electrically connected to the corresponding positive electrode shell 101 or negative electrode shell 102, respectively.

[0039] like Figure 4-Figure 5 As shown, a battery includes a battery shell 100 and a battery core 200. The battery core 200 includes a first battery core 201 and a second battery core 202 which are stacked. Both ends of the first battery core 201 and the second battery core 202 are provided with a bent foil 203. The bent foil 203 on the first battery core 201 and the bent foil 203 on the second battery core 202 are arranged in a mirror image. When the battery core 200 is placed in the accommodating cavity, the bent foils 203 at both ends of the battery core 200 are fixedly connected to the battery shell 100.

[0040] In this embodiment, the first battery cell 201 and the second battery cell 202 are both assembled by winding or stacking the positive electrode sheet, the negative electrode sheet and the separator, and a bent foil 203 is provided at the same end of each positive electrode sheet, and a bent foil 203 is provided at the same end of each negative electrode sheet. In order to reduce the thickness of the stacked bent foil 203, the first battery cell 201 and the second battery cell 202 of the battery cell 200 are mirror-imaged respectively; at the same time, it can also reduce the width of the foil to be bent, facilitate the bending operation of the foil, and increase the forming efficiency of the battery cell 200.

[0041] Further preferably, the battery shell 100 and the bent foil 203 are welded and fixed, and the battery shell 100 and the bent foil 203 on the battery core 200 are welded and fixed by a penetration welding process.

[0042] It should be noted that in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0043] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A battery shell, characterized in that: The invention comprises a fixedly arranged positive electrode shell and a negative electrode shell, wherein the positive electrode shell and the negative electrode shell are both provided with a receiving groove with an opening at one end, and when the positive electrode shell and the negative electrode shell are fixed, the mounting grooves on the positive electrode shell and the negative electrode shell form a receiving cavity for mounting a battery core, and the positive electrode shell and the negative electrode shell are insulated from each other, the positive electrode shell and the negative electrode shell are respectively electrically connected to the positive electrode and the negative electrode of the battery core, an insulating member is provided between the positive electrode shell and the negative electrode shell, so that the positive electrode shell and the negative electrode shell are insulated from each other, and the positive electrode shell and the negative electrode shell do not contact each other, and the insulating member comprises a member provided at the A connecting boss is provided on the outer wall of the opening of one of the negative electrode shell and the positive electrode shell, and a connecting buckle strip is provided on the other one, the connecting buckle strip covers the connecting boss, and a gap is provided between the connecting buckle strip and the connecting boss to form an insulating cavity, an insulating portion is provided in the insulating cavity, the connecting buckle strip includes a first connecting bar arranged in a horizontal direction, and second connecting bars arranged in a vertical direction are integrally provided at both ends of the first connecting bar, one of the second connecting bars is integrally provided with one of the negative electrode shell and the positive electrode shell, and all the second connecting bars do not contact each other.

2. A battery case according to claim 1, characterized in that: The insulating part includes insulating glue, the insulating glue is filled in the insulating cavity, and the insulating glue is respectively bonded to the connecting boss and the connecting buckle strip.

3. A battery case according to claim 2, characterized in that: An insulating spacer is also arranged in the insulating glue.

4. A battery case according to claim 1, characterized in that: The positive electrode shell or the negative electrode shell is provided with an installation opening, the installation opening is communicated with the accommodating cavity, and a shell cover is encapsulated and arranged at the installation opening.

5. A battery, characterized in that: Comprising a battery shell as described in any one of claims 1 to 4.

6. A battery according to claim 5, characterized in that: It also includes a battery core, which includes a first battery core and a second battery core that are stacked, and both ends of the first battery core and the second battery core are provided with bent foils, the bent foil on the first battery core and the bent foil on the second battery core are arranged in a mirror image, and when the battery core is placed in the accommodating cavity, the bent foils at both ends of the battery core are fixedly connected to the battery shell.

7. A battery according to claim 6, characterized in that: The battery shell is fixed to the bent foil by welding.

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