Electrochemical energy storage device

Abstract

The utility model discloses an electrochemical energy storage device can adaptively adjust the position of the clamping mechanism according to the size or installation position requirement of the energy storage main body, satisfy the installation of various specifications energy storage main body, also can satisfy the installation of different positions of energy storage main body on the support mechanism. In other words, the two big core movable components of clamping mechanism have independent adjustment ability, therefore, the user can control the lateral position and elastic support reference point of clamping point respectively, thereby solve the pain point of the strict limitation of traditional fixed mode to energy storage main body size or installation position, can be compatible with different manufacturers, different size energy storage main body, and allow flexible selection energy storage main body laying area on the support mechanism. In addition, the elastic support piece in the clamping mechanism keeps the compression state, can produce the continuous elastic pre-tightening force, so, can compensate the micro gap caused by thermal expansion and cold shrinkage deformation or vibration, ensure that there is no loose abnormal sound in long -term use.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to an electrochemical energy storage device. Background Technology

[0002] Electrochemical energy storage devices (such as lithium-ion battery packs) are widely used as important energy storage units in fields such as grid peak shaving, new energy grid connection, and backup power. These devices typically contain multiple battery modules, which are encapsulated in a housing to form the energy storage unit. In some application scenarios, the energy storage unit needs to be fixed to a support structure.

[0003] In related technologies, energy storage units are often fixed by pre-setting mounting points (such as screw holes or slots) on the support structure. These methods suffer from rigid installation positions: the energy storage unit must be installed strictly according to the pre-set mounting points on the support structure, without the ability to flexibly adjust its position. This significantly limits the flexibility of the energy storage unit's installation layout. When installing energy storage units of different sizes, incompatibility often arises because the pre-set mounting points cannot be matched, requiring replacement of the support structure or the use of complex adapters. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electrochemical energy storage device that can improve the problem of rigid installation positions of the energy storage body.

[0005] An electrochemical energy storage device according to some embodiments of the present invention includes a support mechanism, an energy storage body, and a locking mechanism. The support mechanism includes a support frame and a crossbeam disposed on the support frame. The crossbeam has a transverse slide rail with a transverse opening formed at the top of the crossbeam. The crossbeam has a transverse limiting portion at the edge of the transverse opening. The energy storage body is disposed on the crossbeam. The locking mechanism includes an elastic support component, a locking element, and a locking element. The elastic support component is movably disposed laterally within the transverse slide rail. The elastic support component includes an elastic support member and a locking element. A fixing block is located at the top of the elastic support member, the top of the fixing block being limited and engaged with the lateral limiting part. The snap-fit ​​member is snapped onto the energy storage body, and the snap-fit ​​member is at least movably disposed on the top of the crossbeam. The fixing block has a first mounting hole with its top end facing the lateral opening, and the snap-fit ​​member has a second mounting hole with its bottom end facing the lateral opening. The snap-fit ​​member and / or the elastic support assembly are operably movable laterally to align the first mounting hole and the second mounting hole. The locking member passes through the aligned first mounting hole and the second mounting hole.

[0006] The electrochemical energy storage device according to the embodiments of this utility model has at least the following beneficial effects:

[0007] During assembly, the electrochemical energy storage device of this invention can be assembled by first placing the energy storage body on a crossbeam and adjusting its position. Then, an elastic support assembly is installed within the transverse slide of the crossbeam. Next, the snap-fit ​​component is used to secure the energy storage body onto the crossbeam. The position of the elastic support assembly is then adjusted to align the first and second mounting holes. Finally, a locking component is inserted into the aligned first and second mounting holes, connecting the snap-fit ​​component to the elastic support assembly and securing the energy storage body. Thus, in this electrochemical energy storage device, the position of the snap-fit ​​mechanism can be adaptively adjusted according to the size of the energy storage body or the requirements of its installation location. The snap-fit ​​mechanism described in the above embodiment can accommodate the installation of energy storage bodies of various specifications and can also accommodate installation of the energy storage body at different positions on the support mechanism. In other words, the two core movable components of the snap-fit ​​mechanism (the snap-fit ​​component moves freely on top of the crossbeam; the elastic support component slides within the transverse track) have independent adjustment capabilities. Therefore, users can precisely control the transverse position of the snap-fit ​​point and the reference point of the elastic support, thus solving the pain point of traditional fixing methods that impose strict limitations on the size or installation position of the energy storage unit. It is compatible with energy storage units of different manufacturers and sizes, and allows for flexible selection of the energy storage unit's installation area on the support mechanism (such as avoiding obstacles, aligning edges, etc.). Furthermore, the elastic support component in the snap-fit ​​mechanism remains compressed, generating a continuous elastic preload. This compensates for micro-gaps caused by thermal expansion and contraction or vibration, ensuring no loosening or abnormal noise during long-term use.

[0008] According to some embodiments of the present invention, the top of the fixing block is provided with a transverse groove, and the transverse limiting part passes through the transverse groove.

[0009] According to some embodiments of the present invention, the number of the lateral limiting parts is two, and the two lateral limiting parts are respectively disposed on the two opposite edges of the lateral opening, wherein the arrangement direction of the two lateral limiting parts is perpendicular to the lateral direction.

[0010] The top of the fixing block is held abutted by the two lateral limiting parts.

[0011] According to some embodiments of the present invention, the elastic support member is a spring, and at least part of the spring is sleeved outside the locking member.

[0012] According to some embodiments of the present invention, the top of the elastic support member is connected to a positioning part, the bottom of the fixing block is provided with a positioning groove, and the positioning part is disposed in the positioning groove.

[0013] According to some embodiments of the present invention, the bottom of the elastic support member is connected to a sliding part, the bottom wall of the transverse slide is provided with a transverse groove, and the sliding part is slidably disposed in the transverse groove.

[0014] According to some embodiments of the present invention, the snap-fit ​​member has a traction part, which extends into the transverse slide through the transverse opening and engages with the fixed block in a transmission manner.

[0015] According to some embodiments of the present invention, the number of traction parts is two, the two traction parts are arranged laterally at intervals, and the two traction parts are respectively located on two opposite sides of the fixing block arranged laterally.

[0016] According to some embodiments of this utility model, the locking element is a bolt, the first mounting hole is a screw hole, the second mounting hole is a through hole, and the bolt is sequentially inserted into the through hole and the screw hole.

[0017] According to some embodiments of this utility model, the number of the snap-fit ​​mechanism is at least two, and at least two of the snap-fit ​​mechanisms are respectively snapped onto the two sides of the energy storage body that are arranged opposite each other in the lateral direction.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of an electrochemical energy storage device according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a cross-sectional view of a partial structure of an electrochemical energy storage device according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the snap-fit ​​mechanism according to an embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional view of a snap-fit ​​mechanism according to an embodiment of the present invention.

[0025] Icon labels:

[0026] 100. Support mechanism; 110. Crossbeam; 111. Transverse slide rail; 1111. Transverse opening; 112. Transverse limiting part; 113. Transverse groove; 120. Crossbeam;

[0027] 200. Energy storage main body; 210. Base plate;

[0028] 300. Snap-fit ​​mechanism; 310. Elastic support assembly; 311. Elastic support member; 3111. Positioning part; 3112. Sliding part; 312. Fixing block; 3121. Transverse groove; 3122. Positioning groove; 3123. First mounting hole; 320. Snap-fit ​​member; 321. Traction part; 322. Second mounting hole; 330. Locking member. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] like Figure 1 , Figure 2As shown, an embodiment of the present invention provides an electrochemical energy storage device, including a support mechanism 100, an energy storage body 200, and a snap-fit ​​mechanism 300. The support mechanism 100 supports the energy storage body 200, and the snap-fit ​​mechanism 300 snaps the energy storage body 200 onto the support mechanism 100. The energy storage body 200 is the core energy storage component of the electrochemical energy storage device, consisting of multiple interconnected battery modules encapsulated within a housing. The snap-fit ​​mechanism 300 snaps into the housing to fix the energy storage body 200 to the support mechanism 100.

[0033] Combination Figure 1 and Figure 2 The support mechanism 100 includes a support frame 120 and a crossbeam 110 disposed on the support frame 120.

[0034] Specifically, the support frame 120 is a base frame used to support the crossbeam 110, wherein the crossbeam 110 extends laterally; in other words, the length direction of the crossbeam 110 is laterally. Combined with... Figure 2 and Figure 3 Furthermore, the crossbeam 110 is provided with a transverse slide 111, which has a transverse opening 1111 formed at the top of the crossbeam 110. It can be understood that the transverse slide 111 extends transversely and passes through the two opposite ends of the crossbeam 110 arranged transversely. In addition, the crossbeam 110 has a structure with a transverse opening 1111 at the top, which also extends transversely and passes through the two opposite ends of the crossbeam 110 arranged transversely.

[0035] The energy storage unit 200 is mounted on the crossbeam 110. Specifically, the energy storage unit 200 is fixed to the crossbeam 110 by a snap-fit ​​mechanism 300, and the crossbeam 110 is used to support the energy storage unit 200.

[0036] Furthermore, there can be multiple crossbeams 110, arranged side by side and spaced apart, with the support frame 120 supporting the multiple crossbeams 110. Specifically, the top of the support frame 120 is provided with a longitudinal beam, and multiple crossbeams 110 are arranged side by side and spaced apart on the longitudinal beam.

[0037] Combination Figure 3 and Figure 4 The snap-fit ​​mechanism 300 includes an elastic support component 310, a snap-fit ​​element 320, and a locking element 330.

[0038] The elastic support assembly 310 is movably disposed within the transverse slide rail 111. The elastic support assembly 310 includes an elastic support member 311 and a fixing block 312 disposed on the top of the elastic support member 311. Specifically, the elastic support member 311 is disposed within the transverse slide rail 111, with its bottom abutting against the bottom wall of the transverse slide rail 111, and the fixing block 312 abutting against the top of the elastic support member 311. Figure 2 and Figure 3 Furthermore, the crossbeam 110 is provided with a lateral limiting part 112 at the edge of the lateral opening 1111, and the top of the fixing block 312 is limited and engaged with the lateral limiting part 112. It can be understood that the lateral limiting part 112 is located at the edge of the lateral opening 1111 and extends laterally. The lateral limiting part 112 is used to abut the top of the fixing block 312. Under the limiting action of the lateral limiting part 112, the fixing block 312 can be prevented from dislodging from the lateral opening 1111 under the elastic support of the elastic support member 311. Before the elastic support assembly 310 is locked, the installer can push the elastic support assembly 310, causing it to move laterally within the lateral slide groove 113. Simultaneously, under the combined pressure of the elastic support member 311 and the lateral limiting part 112, the fixing block 312 is stable and will not easily shake or change position without applying additional force to push the elastic support assembly 310.

[0039] Combination Figure 3 and Figure 4 The latching member 320 is latched onto the energy storage body 200. Specifically, the outer shell of the energy storage body 200 has a base plate 210, the edge of which is a protruding structure, and the latching member 320 is latched onto the edge of the base plate 210. The latching member 320 is at least laterally movable and is disposed on the top of the crossbeam 110. Specifically, the latching member 320 is disposed on the top of the crossbeam 110, and before being locked, the latching member 320 can move laterally, and is used to latch the energy storage body 200. Of course, as a component not directly connected to the crossbeam 110, the latching member 320 can also move freely before being locked. Naturally, before it latches onto the energy storage body 200, its position can also be adjusted in a direction perpendicular to the lateral direction.

[0040] Combination Figure 3 and Figure 5 Furthermore, the fixing block 312 is provided with a first mounting hole 3123 with its top end facing the lateral opening 1111, and the snap-fit ​​member 320 is provided with a second mounting hole 322 with its bottom end facing the lateral opening 1111.

[0041] Understandably, before the snap-fit ​​320 and the elastic support assembly 310 are locked, the elastic support assembly 310 and / or the snap-fit ​​320 can be operatively moved laterally to align the first mounting hole 3123 with the second mounting hole 322. The locking member 330 can be inserted into the mutually aligned first mounting hole 3123 and second mounting hole 322 to connect the snap-fit ​​320 with the elastic support assembly 310, thereby fixing the energy storage body 200.

[0042] During assembly, the electrochemical energy storage device of this utility model can be assembled by first placing the energy storage body 200 on the crossbeam 110 and adjusting its position on the crossbeam 110. Then, the elastic support component 310 is installed in the transverse slide 111 of the crossbeam 110. After that, the snap-fit ​​component 320 is snapped into the energy storage body 200 and placed on the crossbeam 110. Then, the position of the elastic support component 310 can be adjusted so that the first mounting hole 3123 and the second mounting hole 322 are aligned. Then, the locking component 330 is inserted into the aligned first mounting hole 3123 and the second mounting hole 322 to connect the snap-fit ​​component 320 and the elastic support component 310 together, thereby fixing the energy storage body 200. Thus, in the electrochemical energy storage device of this utility model, the position of the snap-fit ​​mechanism 300 can be adaptively adjusted according to the size or installation position requirements of the energy storage body 200. The snap-fit ​​mechanism 300 of the above embodiment can accommodate the installation of energy storage bodies 200 of various specifications, and can also accommodate the installation of the energy storage body 200 at different positions on the support mechanism 100. In other words, the two core movable components of the snap-fit ​​mechanism 300 (the snap-fit ​​component 320 moves freely on the top of the crossbeam 110; the elastic support component 310 slides within the transverse slide rail 111) have independent adjustment capabilities. Therefore, users can precisely control the transverse position of the snap-fit ​​point and the elastic support reference point, thereby solving the pain point of the strict limitations on the size or installation position of the energy storage body 200 imposed by traditional fixing methods. It can be compatible with energy storage bodies 200 of different manufacturers and sizes, and allows for flexible selection of the energy storage body 200 installation area on the support mechanism 100 (such as avoiding obstacles, aligning edges, etc.).

[0043] It is also understandable that the elastic support 311 in the snap-fit ​​mechanism 300 remains in a compressed state, which can generate a continuous elastic preload. In this way, it can compensate for the micro gaps caused by thermal expansion and contraction or vibration, and ensure that there is no loosening or abnormal noise during long-term use.

[0044] Combination Figure 3 and Figure 5In some embodiments, the top of the fixing block 312 is provided with a transverse groove 3121, which extends laterally. The transverse limiting part 112 passes through the transverse groove 3121. The cooperation between the transverse limiting part 112 and the transverse groove 3121 can guide the transverse movement of the fixing block 312 and improve the accuracy of the moving path of the fixing block 312.

[0045] Specifically, there are two lateral limiting parts 112, which are respectively disposed on the two opposite edges of the lateral opening 1111. The arrangement direction of the two lateral limiting parts 112 is perpendicular to the lateral direction. The top of the fixing block 312 is supported by the two lateral limiting parts 112.

[0046] More specifically, the top of the lateral limiting part 112 is provided with two lateral grooves 3121, and the two lateral limiting parts 112 are respectively inserted into the two lateral grooves 3121. In this way, the uniformity of force on the fixing block 312 can be improved.

[0047] like Figure 3 As shown, in some embodiments, the elastic support 311 is a spring, and at least part of the spring is sleeved outside the locking member 330. After the locking member 330 passes through the first mounting hole 3123 and the second mounting hole 322, it can also limit the spring.

[0048] like Figure 5 As shown, further, a positioning part 3111 is connected to the top of the elastic support member 311, and a positioning groove 3122 is provided at the bottom of the fixing block 312, with the positioning part 3111 disposed within the positioning groove 3122. The positioning part 3111 and the elastic support member 311 can be welded together or fixed by adhesive. The positioning part 3111, disposed within the positioning groove 3122, serves two purposes: firstly, it allows for the positioning of the elastic support member 311 and the fixing block 312; secondly, when the entire elastic support assembly 310 needs to be slid, only the fixing block 312 needs to be pushed, and the elastic support member 311 can move together with the fixing block 312.

[0049] Combination Figure 3 and Figure 4 Furthermore, the bottom of the elastic support 311 is connected to a sliding part 3112, and the bottom wall of the transverse slide 111 is provided with a transverse groove 113, in which the sliding part 3112 is slidably disposed. The sliding part 3112 and the elastic support 311 can be welded together or fixed by adhesive. The transverse groove 113 guides the lateral sliding of the sliding part 3112, and the friction between the sliding part 3112 and the transverse groove 113 is reduced, resulting in smooth and unobstructed movement of the elastic support assembly 310, and easy and precise positioning adjustment without the hassle of repeated adjustments.

[0050] Combination Figure 3 and Figure 4 Furthermore, the snap-fit ​​component 320 has a traction part 321, which extends into the transverse slide 111 through the transverse opening 1111 and engages with the fixing block 312 in a transmission manner. Understandably, during the assembly of the electrochemical energy storage device, the energy storage body 200 can be placed on the crossbeam 110 first, and the position of the energy storage body 200 on the crossbeam 110 can be adjusted. Then, the elastic support component 310 is installed in the transverse slide 111 of the crossbeam 110. After that, the snap-fit ​​component 320 is placed on the crossbeam 110, and the traction part 321 is engaged with the fixing block 312. At this time, under the positioning action of the traction part 321 and the fixing block 312, the first assembly hole 3123 and the second assembly hole 322 are naturally aligned. Then, the snap-fit ​​component 320 is slid, so that the snap-fit ​​component 320 drives the elastic support component 310 to slide together until the snap-fit ​​component 320 is snapped onto the energy storage body 200. After that, the locking component 330 can be inserted into the first assembly hole 3123 and the second assembly hole 322, thereby connecting the snap-fit ​​component 320 and the elastic support component 310 together, and fixing the energy storage body 200.

[0051] Specifically, there are two traction units 321, which are arranged laterally at intervals and located on opposite sides of the fixing block 312. Thus, during the lateral movement of the operating latch 320, the traction units 321 will pull the fixing block 312 to move laterally as well.

[0052] It should be noted that after the snap-fit ​​component 320 is engaged with the fixing block 312, so that the two traction parts 321 are respectively located on two opposite sides of the fixing block 312 arranged laterally, the two traction parts 321 can achieve lateral positioning of the fixing block 312 and the snap-fit ​​component 320. In this way, the first mounting hole 3123 and the second mounting hole 322 can be quickly aligned. In other words, the traction parts 321 of the snap-fit ​​component 320 symmetrically clamp the fixing block 312, physically forcing the first mounting hole 3123 and the second mounting hole 322 to coincide on the axis. This simplifies the manual hole alignment operation, allows the locking component 330 to be inserted without obstruction, and achieves efficient locking through "blind operation".

[0053] Among them, the locking component 330 is a bolt, the first mounting hole 3123 is a screw hole, and the second mounting hole 322 is a through hole. The bolt is sequentially inserted into the through hole and the screw hole.

[0054] In some embodiments, the number of locking mechanisms 300 is at least two, with at least two locking mechanisms 300 respectively locking onto the two sides of the energy storage body 200 that are arranged laterally opposite to each other. This can further improve the reliability of fixing the energy storage body 200.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrochemical energy storage device, characterized in that, This includes supporting structures, the main energy storage unit, and the connection mechanism; The support mechanism includes a support frame and a crossbeam disposed on the support frame. The crossbeam is provided with a transverse slide rail, the transverse slide rail having a transverse opening formed at the top of the crossbeam, and the crossbeam having a transverse limiting portion at the edge of the transverse opening. The energy storage unit is mounted on the crossbeam; The snap-fit ​​mechanism includes an elastic support component, a snap-fit ​​member, and a locking member. The elastic support component is movably disposed in the transverse slide. The elastic support component includes an elastic support member and a fixing block disposed on the top of the elastic support member. The top of the fixing block is limited and engaged with the transverse limiting part. The snap-fit ​​member is snapped onto the energy storage body, and the snap-fit ​​member is at least movably disposed on the top of the crossbeam. The fixing block has a first mounting hole with its top end facing the lateral opening, and the snap-fit ​​member has a second mounting hole with its bottom end facing the lateral opening. The snap-fit ​​member and / or the elastic support assembly are operable to move laterally so that the first mounting hole and the second mounting hole are aligned. The locking member passes through the aligned first mounting hole and the second mounting hole.

2. The electrochemical energy storage device according to claim 1, characterized in that, The top of the fixing block is provided with a transverse groove, and the transverse limiting part passes through the transverse groove.

3. The electrochemical energy storage device according to claim 1, characterized in that, The number of the lateral limiting parts is two, and the two lateral limiting parts are respectively disposed on the two opposite edges of the lateral opening, wherein the arrangement direction of the two lateral limiting parts is perpendicular to the lateral direction; The top of the fixing block is held abutted by the two lateral limiting parts.

4. The electrochemical energy storage device according to claim 1, characterized in that, The elastic support is a spring, and at least part of the spring is sleeved outside the locking member.

5. The electrochemical energy storage device according to claim 1, characterized in that, The top of the elastic support is connected to a positioning part, and the bottom of the fixing block is provided with a positioning groove, with the positioning part disposed in the positioning groove.

6. The electrochemical energy storage device according to claim 1, characterized in that, The bottom of the elastic support is connected to a sliding part, and the bottom wall of the transverse slide is provided with a transverse groove, and the sliding part is slidably disposed in the transverse groove.

7. The electrochemical energy storage device according to claim 1, characterized in that, The snap-fit ​​component has a traction part that extends into the transverse slide through the transverse opening and engages with the fixed block in a transmission manner.

8. The electrochemical energy storage device according to claim 7, characterized in that, The number of traction parts is two, and the two traction parts are arranged at a distance along the lateral direction. The two traction parts are respectively located on two opposite sides of the fixing block arranged along the lateral direction.

9. The electrochemical energy storage device according to claim 1, characterized in that, The locking component is a bolt, the first mounting hole is a screw hole, the second mounting hole is a through hole, and the bolt is sequentially inserted into the through hole and the screw hole.

10. The electrochemical energy storage device according to claim 1, characterized in that, The number of the locking mechanisms is at least two, and at least two of the locking mechanisms are respectively locked onto the two sides of the energy storage body that are arranged opposite each other in the lateral direction.

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